read_http_request_body(): End more log messages with periods.
[privoxy.git] / jcc.c
1 /*********************************************************************
2  *
3  * File        :  $Source: /cvsroot/ijbswa/current/jcc.c,v $
4  *
5  * Purpose     :  Main file.  Contains main() method, main loop, and
6  *                the main connection-handling function.
7  *
8  * Copyright   :  Written by and Copyright (C) 2001-2022 the
9  *                Privoxy team. https://www.privoxy.org/
10  *
11  *                Based on the Internet Junkbuster originally written
12  *                by and Copyright (C) 1997 Anonymous Coders and
13  *                Junkbusters Corporation.  http://www.junkbusters.com
14  *
15  *                This program is free software; you can redistribute it
16  *                and/or modify it under the terms of the GNU General
17  *                Public License as published by the Free Software
18  *                Foundation; either version 2 of the License, or (at
19  *                your option) any later version.
20  *
21  *                This program is distributed in the hope that it will
22  *                be useful, but WITHOUT ANY WARRANTY; without even the
23  *                implied warranty of MERCHANTABILITY or FITNESS FOR A
24  *                PARTICULAR PURPOSE.  See the GNU General Public
25  *                License for more details.
26  *
27  *                The GNU General Public License should be included with
28  *                this file.  If not, you can view it at
29  *                http://www.gnu.org/copyleft/gpl.html
30  *                or write to the Free Software Foundation, Inc., 59
31  *                Temple Place - Suite 330, Boston, MA  02111-1307, USA.
32  *
33  *********************************************************************/
34
35
36 #include "config.h"
37
38 #include <stdio.h>
39 #include <sys/types.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <signal.h>
43 #include <fcntl.h>
44 #include <errno.h>
45 #include <assert.h>
46
47 #ifdef _WIN32
48 # ifndef FEATURE_PTHREAD
49 #  ifndef STRICT
50 #   define STRICT
51 #  endif
52 #  include <winsock2.h>
53 #  include <windows.h>
54 #  include <process.h>
55 # endif /* ndef FEATURE_PTHREAD */
56
57 # include "win32.h"
58 # ifndef _WIN_CONSOLE
59 #  include "w32log.h"
60 # endif /* ndef _WIN_CONSOLE */
61 # include "w32svrapi.h"
62
63 #else /* ifndef _WIN32 */
64
65 # include <unistd.h>
66 # include <sys/wait.h>
67 # include <sys/time.h>
68 # include <sys/stat.h>
69 # include <sys/ioctl.h>
70
71 #ifdef sun
72 #include <sys/termios.h>
73 #endif /* sun */
74
75 #ifdef unix
76 #include <pwd.h>
77 #include <grp.h>
78 #endif
79
80 # include <signal.h>
81
82 # ifdef __BEOS__
83 #  include <socket.h>  /* BeOS has select() for sockets only. */
84 #  include <OS.h>      /* declarations for threads and stuff. */
85 # endif
86
87 #ifdef HAVE_POLL
88 #ifdef __GLIBC__
89 #include <sys/poll.h>
90 #else
91 #include <poll.h>
92 #endif /* def __GLIBC__ */
93 #else
94 # ifndef FD_ZERO
95 #  include <select.h>
96 # endif
97 #warning poll() appears to be unavailable. Your platform will become unsupported in the future.
98 #endif /* HAVE_POLL */
99
100 #endif
101
102 #include "project.h"
103 #include "list.h"
104 #include "jcc.h"
105 #ifdef FEATURE_HTTPS_INSPECTION
106 #include "ssl.h"
107 #endif
108 #include "filters.h"
109 #include "loaders.h"
110 #include "parsers.h"
111 #include "miscutil.h"
112 #include "errlog.h"
113 #include "jbsockets.h"
114 #include "gateway.h"
115 #include "actions.h"
116 #include "cgi.h"
117 #include "loadcfg.h"
118 #include "urlmatch.h"
119 #ifdef FEATURE_CLIENT_TAGS
120 #include "client-tags.h"
121 #endif
122
123 int daemon_mode = 1;
124 struct client_states clients[1];
125 struct file_list     files[1];
126
127 #ifdef FEATURE_STATISTICS
128 int urls_read     = 0;     /* total nr of urls read inc rejected */
129 int urls_rejected = 0;     /* total nr of urls rejected */
130 #ifdef MUTEX_LOCKS_AVAILABLE
131 unsigned long long number_of_requests_received = 0;
132 unsigned long long number_of_requests_blocked = 0;
133 #endif
134 #endif /* def FEATURE_STATISTICS */
135
136 #ifdef FEATURE_GRACEFUL_TERMINATION
137 int g_terminate = 0;
138 #endif
139
140 #if !defined(_WIN32)
141 static void sig_handler(int the_signal);
142 #endif
143 static int client_protocol_is_unsupported(struct client_state *csp, char *req);
144 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
145 static jb_err get_server_headers(struct client_state *csp);
146 static const char *crunch_reason(const struct http_response *rsp);
147 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
148 static char *get_request_line(struct client_state *csp);
149 static jb_err receive_client_request(struct client_state *csp);
150 static jb_err parse_client_request(struct client_state *csp);
151 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
152 static jb_err change_request_destination(struct client_state *csp);
153 static void handle_established_connection(struct client_state *csp);
154 static void chat(struct client_state *csp);
155 static void serve(struct client_state *csp);
156 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
157 static void usage(const char *myname);
158 #endif
159 static void initialize_mutexes(void);
160 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog);
161 static void bind_ports_helper(struct configuration_spec *config, jb_socket sockets[]);
162 static void close_ports_helper(jb_socket sockets[]);
163 static void listen_loop(void);
164 static void serve(struct client_state *csp);
165
166 #ifdef __BEOS__
167 static int32 server_thread(void *data);
168 #endif /* def __BEOS__ */
169
170 #ifdef _WIN32
171 #define sleep(N)  Sleep(((N) * 1000))
172 #endif
173
174 #ifdef FUZZ
175 int process_fuzzed_input(char *fuzz_input_type, char *fuzz_input_file);
176 void show_fuzz_usage(const char *name);
177 #endif
178
179 #ifdef MUTEX_LOCKS_AVAILABLE
180 /*
181  * XXX: Does the locking stuff really belong in this file?
182  */
183 privoxy_mutex_t log_mutex;
184 privoxy_mutex_t log_init_mutex;
185 privoxy_mutex_t connection_reuse_mutex;
186
187 #ifdef FEATURE_HTTPS_INSPECTION
188 privoxy_mutex_t certificate_mutex;
189 privoxy_mutex_t ssl_init_mutex;
190 #endif
191
192 #ifdef FEATURE_EXTERNAL_FILTERS
193 privoxy_mutex_t external_filter_mutex;
194 #endif
195 #ifdef FEATURE_CLIENT_TAGS
196 privoxy_mutex_t client_tags_mutex;
197 #endif
198 #ifdef FEATURE_STATISTICS
199 privoxy_mutex_t block_statistics_mutex;
200 #endif
201 #ifdef FEATURE_EXTENDED_STATISTICS
202 privoxy_mutex_t filter_statistics_mutex;
203 privoxy_mutex_t block_reason_statistics_mutex;
204 #endif
205
206 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
207 privoxy_mutex_t resolver_mutex;
208 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
209
210 #ifndef HAVE_GMTIME_R
211 privoxy_mutex_t gmtime_mutex;
212 #endif /* ndef HAVE_GMTIME_R */
213
214 #ifndef HAVE_LOCALTIME_R
215 privoxy_mutex_t localtime_mutex;
216 #endif /* ndef HAVE_GMTIME_R */
217
218 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
219 privoxy_mutex_t rand_mutex;
220 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
221
222 #endif /* def MUTEX_LOCKS_AVAILABLE */
223
224 #if defined(unix)
225 const char *basedir = NULL;
226 const char *pidfile = NULL;
227 static int received_hup_signal = 0;
228 #endif /* defined unix */
229
230 /* HTTP snipplets. */
231 static const char CSUCCEED[] =
232    "HTTP/1.1 200 Connection established\r\n\r\n";
233
234 static const char CHEADER[] =
235    "HTTP/1.1 400 Invalid header received from client\r\n"
236    "Content-Type: text/plain\r\n"
237    "Connection: close\r\n\r\n"
238    "Invalid header received from client.\n";
239
240 static const char FTP_RESPONSE[] =
241    "HTTP/1.1 400 Invalid request received from client\r\n"
242    "Content-Type: text/plain\r\n"
243    "Connection: close\r\n\r\n"
244    "Invalid request. Privoxy doesn't support FTP.\n";
245
246 static const char GOPHER_RESPONSE[] =
247    "HTTP/1.1 400 Invalid request received from client\r\n"
248    "Content-Type: text/plain\r\n"
249    "Connection: close\r\n\r\n"
250    "Invalid request. Privoxy doesn't support gopher.\n";
251
252 /* XXX: should be a template */
253 static const char MISSING_DESTINATION_RESPONSE[] =
254    "HTTP/1.1 400 Bad request received from client\r\n"
255    "Content-Type: text/plain\r\n"
256    "Connection: close\r\n\r\n"
257    "Bad request. Privoxy was unable to extract the destination.\n";
258
259 /* XXX: should be a template */
260 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
261    "HTTP/1.1 502 Server or forwarder response invalid\r\n"
262    "Content-Type: text/plain\r\n"
263    "Connection: close\r\n\r\n"
264    "Bad response. The server or forwarder response doesn't look like HTTP.\n";
265
266 /* XXX: should be a template */
267 static const char MESSED_UP_REQUEST_RESPONSE[] =
268    "HTTP/1.1 400 Malformed request after rewriting\r\n"
269    "Content-Type: text/plain\r\n"
270    "Connection: close\r\n\r\n"
271    "Bad request. Messed up with header filters.\n";
272
273 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
274    "HTTP/1.1 503 Too many open connections\r\n"
275    "Content-Type: text/plain\r\n"
276    "Connection: close\r\n\r\n"
277    "Maximum number of open connections reached.\n";
278
279 static const char CLIENT_CONNECTION_TIMEOUT_RESPONSE[] =
280    "HTTP/1.1 504 Connection timeout\r\n"
281    "Content-Type: text/plain\r\n"
282    "Connection: close\r\n\r\n"
283    "The connection timed out because the client request didn't arrive in time.\n";
284
285 static const char CLIENT_BODY_PARSE_ERROR_RESPONSE[] =
286    "HTTP/1.1 400 Failed reading client body\r\n"
287    "Content-Type: text/plain\r\n"
288    "Connection: close\r\n\r\n"
289    "Failed parsing or buffering the chunk-encoded client body.\n";
290
291 static const char CLIENT_BODY_BUFFER_ERROR_RESPONSE[] =
292    "HTTP/1.1 400 Failed reading client body\r\n"
293    "Content-Type: text/plain\r\n"
294    "Connection: close\r\n\r\n"
295    "Failed to buffer the client body to apply content filters.\n"
296    "Could be caused by a socket timeout\n";
297
298 static const char UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE[] =
299    "HTTP/1.1 417 Expecting too much\r\n"
300    "Content-Type: text/plain\r\n"
301    "Connection: close\r\n\r\n"
302    "Privoxy detected an unsupported Expect header value.\n";
303
304 /* A function to crunch a response */
305 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
306
307 /* Crunch function flags */
308 #define CF_NO_FLAGS        0
309 /* Cruncher applies to forced requests as well */
310 #define CF_IGNORE_FORCE    1
311 /* Crunched requests are counted for the block statistics */
312 #define CF_COUNT_AS_REJECT 2
313
314 /* A crunch function and its flags */
315 struct cruncher
316 {
317    const crunch_func_ptr cruncher;
318    const int flags;
319 };
320
321 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
322
323 /* Complete list of cruncher functions */
324 static const struct cruncher crunchers_all[] = {
325    { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
326    { block_url,       CF_COUNT_AS_REJECT },
327 #ifdef FEATURE_TRUST
328    { trust_url,       CF_COUNT_AS_REJECT },
329 #endif /* def FEATURE_TRUST */
330    { redirect_url,    CF_NO_FLAGS  },
331    { dispatch_cgi,    CF_IGNORE_FORCE},
332    { NULL,            0 }
333 };
334
335 /* Light version, used after tags are applied */
336 static const struct cruncher crunchers_light[] = {
337    { block_url,       CF_COUNT_AS_REJECT },
338    { redirect_url,    CF_NO_FLAGS },
339    { NULL,            0 }
340 };
341
342
343 /*
344  * XXX: Don't we really mean
345  *
346  * #if defined(unix)
347  *
348  * here?
349  */
350 #if !defined(_WIN32)
351 /*********************************************************************
352  *
353  * Function    :  sig_handler
354  *
355  * Description :  Signal handler for different signals.
356  *                Exit gracefully on TERM and INT
357  *                or set a flag that will cause the errlog
358  *                to be reopened by the main thread on HUP.
359  *
360  * Parameters  :
361  *          1  :  the_signal = the signal cause this function to call
362  *
363  * Returns     :  -
364  *
365  *********************************************************************/
366 static void sig_handler(int the_signal)
367 {
368    switch(the_signal)
369    {
370       case SIGTERM:
371       case SIGINT:
372          log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
373 #if defined(unix)
374          if (pidfile)
375          {
376             unlink(pidfile);
377          }
378 #endif /* unix */
379          exit(the_signal);
380          break;
381
382       case SIGHUP:
383 #if defined(unix)
384          received_hup_signal = 1;
385 #endif
386          break;
387
388       default:
389          /*
390           * We shouldn't be here, unless we catch signals
391           * in main() that we can't handle here!
392           */
393          log_error(LOG_LEVEL_FATAL,
394             "sig_handler: exiting on unexpected signal %d", the_signal);
395    }
396    return;
397
398 }
399 #endif
400
401
402 /*********************************************************************
403  *
404  * Function    :  get_write_delay
405  *
406  * Description :  Parse the delay-response parameter.
407  *
408  * Parameters  :
409  *          1  :  csp = Current client state (buffers, headers, etc...)
410  *
411  * Returns     :  Number of milliseconds to delay writes.
412  *
413  *********************************************************************/
414 static unsigned int get_write_delay(const struct client_state *csp)
415 {
416    unsigned int delay;
417    char *endptr;
418    char *newval;
419
420    if ((csp->action->flags & ACTION_DELAY_RESPONSE) == 0)
421    {
422       return 0;
423    }
424    newval = csp->action->string[ACTION_STRING_DELAY_RESPONSE];
425
426    delay = (unsigned)strtol(newval, &endptr, 0);
427    if (*endptr != '\0')
428    {
429       log_error(LOG_LEVEL_FATAL,
430          "Invalid delay-response{} parameter: '%s'", newval);
431    }
432
433    return delay;
434
435 }
436
437
438 /*********************************************************************
439  *
440  * Function    :  client_protocol_is_unsupported
441  *
442  * Description :  Checks if the client used a known unsupported
443  *                protocol and deals with it by sending an error
444  *                response.
445  *
446  * Parameters  :
447  *          1  :  csp = Current client state (buffers, headers, etc...)
448  *          2  :  req = the first request line send by the client
449  *
450  * Returns     :  TRUE if an error response has been generated, or
451  *                FALSE if the request doesn't look invalid.
452  *
453  *********************************************************************/
454 static int client_protocol_is_unsupported(struct client_state *csp, char *req)
455 {
456    /*
457     * If it's a FTP or gopher request, we don't support it.
458     *
459     * These checks are better than nothing, but they might
460     * not work in all configurations and some clients might
461     * have problems digesting the answer.
462     *
463     * They should, however, never cause more problems than
464     * Privoxy's old behaviour (returning the misleading HTML
465     * error message:
466     *
467     * "Could not resolve http://(ftp|gopher)://example.org").
468     */
469    if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
470    {
471       const char *response = NULL;
472       const char *protocol = NULL;
473
474       if (!strncmpic(req, "GET ftp://", 10))
475       {
476          response = FTP_RESPONSE;
477          protocol = "FTP";
478       }
479       else
480       {
481          response = GOPHER_RESPONSE;
482          protocol = "GOPHER";
483       }
484       log_error(LOG_LEVEL_ERROR,
485          "%s tried to use Privoxy as %s proxy: %s",
486          csp->ip_addr_str, protocol, req);
487       log_error(LOG_LEVEL_CLF,
488          "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
489       freez(req);
490
491 #ifdef FEATURE_HTTPS_INSPECTION
492       if (client_use_ssl(csp))
493       {
494          ssl_send_data_delayed(&(csp->ssl_client_attr),
495             (const unsigned char *)response, strlen(response),
496             get_write_delay(csp));
497       }
498       else
499 #endif
500       {
501          write_socket_delayed(csp->cfd, response, strlen(response),
502             get_write_delay(csp));
503       }
504
505       return TRUE;
506    }
507
508    return FALSE;
509 }
510
511
512 /*********************************************************************
513  *
514  * Function    :  client_has_unsupported_expectations
515  *
516  * Description :  Checks if the client used an unsupported expectation
517  *                in which case an error message is delivered.
518  *
519  * Parameters  :
520  *          1  :  csp = Current client state (buffers, headers, etc...)
521  *
522  * Returns     :  TRUE if an error response has been generated, or
523  *                FALSE if the request doesn't look invalid.
524  *
525  *********************************************************************/
526 static int client_has_unsupported_expectations(const struct client_state *csp)
527 {
528    if ((csp->flags & CSP_FLAG_UNSUPPORTED_CLIENT_EXPECTATION))
529    {
530       log_error(LOG_LEVEL_ERROR,
531          "Rejecting request from client %s with unsupported Expect header value",
532          csp->ip_addr_str);
533       log_error(LOG_LEVEL_CLF,
534          "%s - - [%T] \"%s\" 417 0", csp->ip_addr_str, csp->http->cmd);
535       write_socket_delayed(csp->cfd,
536          UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE,
537          strlen(UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE),
538          get_write_delay(csp));
539
540       return TRUE;
541    }
542
543    return FALSE;
544
545 }
546
547
548 /*********************************************************************
549  *
550  * Function    :  get_request_destination_elsewhere
551  *
552  * Description :  If the client's request was redirected into
553  *                Privoxy without the client's knowledge,
554  *                the request line lacks the destination host.
555  *
556  *                This function tries to get it elsewhere,
557  *                provided accept-intercepted-requests is enabled.
558  *
559  *                "Elsewhere" currently only means "Host: header",
560  *                but in the future we may ask the redirecting
561  *                packet filter to look the destination up.
562  *
563  *                If the destination stays unknown, an error
564  *                response is send to the client and headers
565  *                are freed so that chat() can return directly.
566  *
567  * Parameters  :
568  *          1  :  csp = Current client state (buffers, headers, etc...)
569  *          2  :  headers = a header list
570  *
571  * Returns     :  JB_ERR_OK if the destination is now known, or
572  *                JB_ERR_PARSE if it isn't.
573  *
574  *********************************************************************/
575 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
576 {
577    if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
578    {
579       log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
580          " Privoxy isn't configured to accept intercepted requests.",
581          csp->ip_addr_str, csp->http->cmd);
582       /* XXX: Use correct size */
583       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
584          csp->ip_addr_str, csp->http->cmd);
585
586       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
587          get_write_delay(csp));
588       destroy_list(headers);
589
590       return JB_ERR_PARSE;
591    }
592    else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
593    {
594       /* Split the domain we just got for pattern matching */
595       init_domain_components(csp->http);
596
597       return JB_ERR_OK;
598    }
599    else
600    {
601       /* We can't work without destination. Go spread the news.*/
602
603       /* XXX: Use correct size */
604       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
605          csp->ip_addr_str, csp->http->cmd);
606       log_error(LOG_LEVEL_ERROR,
607          "Privoxy was unable to get the destination for %s's request: %s",
608          csp->ip_addr_str, csp->http->cmd);
609
610       write_socket_delayed(csp->cfd, MISSING_DESTINATION_RESPONSE,
611          strlen(MISSING_DESTINATION_RESPONSE), get_write_delay(csp));
612       destroy_list(headers);
613
614       return JB_ERR_PARSE;
615    }
616    /*
617     * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
618     * to get the destination IP address, use it as host directly
619     * or do a reverse DNS lookup first.
620     */
621 }
622
623
624 /*********************************************************************
625  *
626  * Function    :  get_server_headers
627  *
628  * Description :  Parses server headers in iob and fills them
629  *                into csp->headers so that they can later be
630  *                handled by sed().
631  *
632  * Parameters  :
633  *          1  :  csp = Current client state (buffers, headers, etc...)
634  *
635  * Returns     :  JB_ERR_OK if everything went fine, or
636  *                JB_ERR_PARSE if the headers were incomplete.
637  *
638  *********************************************************************/
639 static jb_err get_server_headers(struct client_state *csp)
640 {
641    int continue_hack_in_da_house = 0;
642    char * header;
643
644    while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
645    {
646       if (header == NULL)
647       {
648          /*
649           * continue hack in da house. Ignore the ending of
650           * this head and continue enlisting header lines.
651           * The reason is described below.
652           */
653          enlist(csp->headers, "");
654          continue_hack_in_da_house = 0;
655          continue;
656       }
657       else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
658       {
659          /*
660           * It's a bodyless continue response, don't
661           * stop header parsing after reaching its end.
662           *
663           * As a result Privoxy will concatenate the
664           * next response's head and parse and deliver
665           * the headers as if they belonged to one request.
666           *
667           * The client will separate them because of the
668           * empty line between them.
669           *
670           * XXX: What we're doing here is clearly against
671           * the intended purpose of the continue header,
672           * and under some conditions (HTTP/1.0 client request)
673           * it's a standard violation.
674           *
675           * Anyway, "sort of against the spec" is preferable
676           * to "always getting confused by Continue responses"
677           * (Privoxy's behaviour before this hack was added)
678           */
679          log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
680          continue_hack_in_da_house = 1;
681       }
682       else if (*header == '\0')
683       {
684          /*
685           * If the header is empty, but the Continue hack
686           * isn't active, we can assume that we reached the
687           * end of the buffer before we hit the end of the
688           * head.
689           *
690           * Inform the caller an let it decide how to handle it.
691           */
692          return JB_ERR_PARSE;
693       }
694
695       if (JB_ERR_MEMORY == enlist(csp->headers, header))
696       {
697          /*
698           * XXX: Should we quit the request and return a
699           * out of memory error page instead?
700           */
701          log_error(LOG_LEVEL_ERROR,
702             "Out of memory while enlisting server headers. %s lost.",
703             header);
704       }
705       freez(header);
706    }
707
708    return JB_ERR_OK;
709 }
710
711
712 /*********************************************************************
713  *
714  * Function    :  crunch_reason
715  *
716  * Description :  Translates the crunch reason code into a string.
717  *
718  * Parameters  :
719  *          1  :  rsp = a http_response
720  *
721  * Returns     :  A string with the crunch reason or an error description.
722  *
723  *********************************************************************/
724 static const char *crunch_reason(const struct http_response *rsp)
725 {
726    char * reason = NULL;
727
728    assert(rsp != NULL);
729    if (rsp == NULL)
730    {
731       return "Internal error while searching for crunch reason";
732    }
733
734    switch (rsp->crunch_reason)
735    {
736       case UNSUPPORTED:
737          reason = "Unsupported HTTP feature";
738          break;
739       case BLOCKED:
740          reason = "Blocked";
741          break;
742       case UNTRUSTED:
743          reason = "Untrusted";
744          break;
745       case REDIRECTED:
746          reason = "Redirected";
747          break;
748       case CGI_CALL:
749          reason = "CGI Call";
750          break;
751       case NO_SUCH_DOMAIN:
752          reason = "DNS failure";
753          break;
754       case FORWARDING_FAILED:
755          reason = "Forwarding failed";
756          break;
757       case CONNECT_FAILED:
758          reason = "Connection failure";
759          break;
760       case OUT_OF_MEMORY:
761          reason = "Out of memory (may mask other reasons)";
762          break;
763       case CONNECTION_TIMEOUT:
764          reason = "Connection timeout";
765          break;
766       case NO_SERVER_DATA:
767          reason = "No server data received";
768          break;
769       default:
770          reason = "No reason recorded";
771          break;
772    }
773
774    return reason;
775 }
776
777
778 /*********************************************************************
779  *
780  * Function    :  log_applied_actions
781  *
782  * Description :  Logs the applied actions if LOG_LEVEL_ACTIONS is
783  *                enabled.
784  *
785  * Parameters  :
786  *          1  :  actions = Current action spec to log
787  *
788  * Returns     :  Nothing.
789  *
790  *********************************************************************/
791 static void log_applied_actions(const struct current_action_spec *actions)
792 {
793    /*
794     * The conversion to text requires lots of memory allocations so
795     * we only do the conversion if the user is actually interested.
796     */
797    if (debug_level_is_enabled(LOG_LEVEL_ACTIONS))
798    {
799       char *actions_as_text = actions_to_line_of_text(actions);
800       log_error(LOG_LEVEL_ACTIONS, "%s", actions_as_text);
801       freez(actions_as_text);
802    }
803 }
804
805
806 /*********************************************************************
807  *
808  * Function    :  send_crunch_response
809  *
810  * Description :  Delivers already prepared response for
811  *                intercepted requests, logs the interception
812  *                and frees the response.
813  *
814  * Parameters  :
815  *          1  :  csp = Current client state (buffers, headers, etc...)
816  *          2  :  rsp = Fully prepared response. Will be freed on exit.
817  *
818  * Returns     :  Nothing.
819  *
820  *********************************************************************/
821 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
822 {
823       const struct http_request *http = csp->http;
824       char status_code[4];
825
826       assert(rsp != NULL);
827       assert(rsp->head != NULL);
828
829       if (rsp == NULL)
830       {
831          log_error(LOG_LEVEL_FATAL, "NULL response in send_crunch_response.");
832       }
833
834       /*
835        * Extract the status code from the actual head
836        * that will be send to the client. It is the only
837        * way to get it right for all requests, including
838        * the fixed ones for out-of-memory problems.
839        *
840        * A head starts like this: 'HTTP/1.1 200...'
841        *                           0123456789|11
842        *                                     10
843        */
844       status_code[0] = rsp->head[9];
845       status_code[1] = rsp->head[10];
846       status_code[2] = rsp->head[11];
847       status_code[3] = '\0';
848
849       /* Log that the request was crunched and why. */
850       log_applied_actions(csp->action);
851 #ifdef FEATURE_HTTPS_INSPECTION
852       if (client_use_ssl(csp))
853       {
854          log_error(LOG_LEVEL_CRUNCH, "%s: https://%s%s", crunch_reason(rsp),
855             http->hostport, http->path);
856          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" %s %lu",
857             csp->ip_addr_str, http->gpc, http->hostport, http->path,
858             http->version, status_code, rsp->content_length);
859       }
860       else
861 #endif
862       {
863          log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
864          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %lu",
865             csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
866       }
867       /* Write the answer to the client */
868 #ifdef FEATURE_HTTPS_INSPECTION
869       if (client_use_ssl(csp))
870       {
871          if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
872                 (const unsigned char *)rsp->head, rsp->head_length,
873                 get_write_delay(csp)) < 0)
874           || (ssl_send_data_delayed(&(csp->ssl_client_attr),
875                 (const unsigned char *)rsp->body, rsp->content_length,
876                 get_write_delay(csp)) < 0))
877          {
878             /* There is nothing we can do about it. */
879             log_error(LOG_LEVEL_CONNECT, "Couldn't deliver the error message "
880                "for https://%s%s through client socket %d using TLS/SSL",
881                http->hostport, http->url, csp->cfd);
882          }
883       }
884       else
885 #endif
886       {
887          if (write_socket_delayed(csp->cfd, rsp->head, rsp->head_length,
888                 get_write_delay(csp))
889           || write_socket_delayed(csp->cfd, rsp->body, rsp->content_length,
890                 get_write_delay(csp)))
891          {
892             /* There is nothing we can do about it. */
893             log_error(LOG_LEVEL_CONNECT,
894                "Couldn't deliver the error message for %s through client socket %d: %E",
895                http->url, csp->cfd);
896          }
897       }
898
899       /* Clean up and return */
900       if (cgi_error_memory() != rsp)
901       {
902          free_http_response(rsp);
903       }
904       return;
905 }
906
907
908 /*********************************************************************
909  *
910  * Function    :  crunch_response_triggered
911  *
912  * Description :  Checks if the request has to be crunched,
913  *                and delivers the crunch response if necessary.
914  *
915  * Parameters  :
916  *          1  :  csp = Current client state (buffers, headers, etc...)
917  *          2  :  crunchers = list of cruncher functions to run
918  *
919  * Returns     :  TRUE if the request was answered with a crunch response
920  *                FALSE otherwise.
921  *
922  *********************************************************************/
923 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
924 {
925    struct http_response *rsp = NULL;
926    const struct cruncher *c;
927
928    /*
929     * If CGI request crunching is disabled,
930     * check the CGI dispatcher out of order to
931     * prevent unintentional blocks or redirects.
932     */
933    if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
934        && (NULL != (rsp = dispatch_cgi(csp))))
935    {
936       /* Deliver, log and free the interception response. */
937       send_crunch_response(csp, rsp);
938       csp->flags |= CSP_FLAG_CRUNCHED;
939       return TRUE;
940    }
941
942    for (c = crunchers; c->cruncher != NULL; c++)
943    {
944       /*
945        * Check the cruncher if either Privoxy is toggled
946        * on and the request isn't forced, or if the cruncher
947        * applies to forced requests as well.
948        */
949       if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
950           !(csp->flags & CSP_FLAG_FORCED)) ||
951           (c->flags & CF_IGNORE_FORCE))
952       {
953          rsp = c->cruncher(csp);
954          if (NULL != rsp)
955          {
956             /* Deliver, log and free the interception response. */
957             send_crunch_response(csp, rsp);
958             csp->flags |= CSP_FLAG_CRUNCHED;
959 #ifdef FEATURE_STATISTICS
960             if (c->flags & CF_COUNT_AS_REJECT)
961             {
962 #ifdef MUTEX_LOCKS_AVAILABLE
963                privoxy_mutex_lock(&block_statistics_mutex);
964                number_of_requests_blocked++;
965                privoxy_mutex_unlock(&block_statistics_mutex);
966 #endif
967                csp->flags |= CSP_FLAG_REJECTED;
968             }
969 #endif /* def FEATURE_STATISTICS */
970
971             return TRUE;
972          }
973       }
974    }
975
976    return FALSE;
977 }
978
979
980 /*********************************************************************
981  *
982  * Function    :  build_request_line
983  *
984  * Description :  Builds the HTTP request line.
985  *
986  *                If a HTTP forwarder is used it expects the whole URL,
987  *                web servers only get the path.
988  *
989  * Parameters  :
990  *          1  :  csp = Current client state (buffers, headers, etc...)
991  *          2  :  fwd = The forwarding spec used for the request.
992  *                      Can be NULL.
993  *          3  :  request_line = The old request line which will be replaced.
994  *
995  * Returns     :  Nothing. Terminates in case of memory problems.
996  *
997  *********************************************************************/
998 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
999 {
1000    struct http_request *http = csp->http;
1001
1002    /*
1003     * Downgrade http version from 1.1 to 1.0
1004     * if +downgrade action applies.
1005     */
1006    if ((csp->action->flags & ACTION_DOWNGRADE)
1007      && (!strcmpic(http->version, "HTTP/1.1")))
1008    {
1009       freez(http->version);
1010       http->version = strdup_or_die("HTTP/1.0");
1011    }
1012
1013    /*
1014     * Rebuild the request line.
1015     */
1016    freez(*request_line);
1017 #ifdef FEATURE_HTTPS_INSPECTION
1018    if (fwd != NULL && fwd->forward_host &&
1019        fwd->type != FORWARD_WEBSERVER && client_use_ssl(csp))
1020    {
1021       *request_line = strdup("CONNECT ");
1022    }
1023    else
1024 #endif
1025    {
1026       *request_line = strdup(http->gpc);
1027       string_append(request_line, " ");
1028    }
1029
1030    if (fwd != NULL && fwd->forward_host && fwd->type != FORWARD_WEBSERVER)
1031    {
1032 #ifdef FEATURE_HTTPS_INSPECTION
1033       if (client_use_ssl(csp))
1034       {
1035          char port_string[10];
1036
1037          string_append(request_line, http->host);
1038          snprintf(port_string, sizeof(port_string), ":%d", http->port);
1039          string_append(request_line, port_string);
1040       }
1041       else
1042 #endif
1043       {
1044          string_append(request_line, http->url);
1045       }
1046    }
1047    else
1048    {
1049       string_append(request_line, http->path);
1050    }
1051    string_append(request_line, " ");
1052    string_append(request_line, http->version);
1053
1054    if (*request_line == NULL)
1055    {
1056       log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1057    }
1058    log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1059 }
1060
1061
1062 /*********************************************************************
1063  *
1064  * Function    :  change_request_destination
1065  *
1066  * Description :  Parse a (rewritten) request line and regenerate
1067  *                the http request data.
1068  *
1069  * Parameters  :
1070  *          1  :  csp = Current client state (buffers, headers, etc...)
1071  *
1072  * Returns     :  Forwards the parse_http_request() return code.
1073  *                Terminates in case of memory problems.
1074  *
1075  *********************************************************************/
1076 static jb_err change_request_destination(struct client_state *csp)
1077 {
1078    struct http_request *http = csp->http;
1079    jb_err err;
1080
1081    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
1082       csp->headers->first->str);
1083    free_http_request(http);
1084    err = parse_http_request(csp->headers->first->str, http);
1085    if (JB_ERR_OK != err)
1086    {
1087       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1088          jb_err_to_string(err));
1089    }
1090    if (http->ssl && strcmpic(csp->http->gpc, "CONNECT"))
1091    {
1092       /*
1093        * A client header filter changed the request URL from
1094        * http:// to https:// which we currently don't support.
1095        */
1096       log_error(LOG_LEVEL_ERROR, "Changing the request destination from http "
1097          "to https behind the client's back currently isn't supported.");
1098       return JB_ERR_PARSE;
1099    }
1100
1101    return err;
1102 }
1103
1104
1105 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1106 /*********************************************************************
1107  *
1108  * Function    :  server_response_is_complete
1109  *
1110  * Description :  Determines whether we should stop reading
1111  *                from the server socket.
1112  *
1113  * Parameters  :
1114  *          1  :  csp = Current client state (buffers, headers, etc...)
1115  *          2  :  content_length = Length of content received so far.
1116  *
1117  * Returns     :  TRUE if the response is complete,
1118  *                FALSE otherwise.
1119  *
1120  *********************************************************************/
1121 static int server_response_is_complete(struct client_state *csp,
1122    unsigned long long content_length)
1123 {
1124    int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1125
1126    if (!strcmpic(csp->http->gpc, "HEAD"))
1127    {
1128       /*
1129        * "HEAD" implies no body, we are thus expecting
1130        * no content. XXX: incomplete "list" of methods?
1131        */
1132       csp->expected_content_length = 0;
1133       content_length_known = TRUE;
1134       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1135    }
1136
1137    if (csp->http->status == 204 || csp->http->status == 304)
1138    {
1139       /*
1140        * Expect no body. XXX: incomplete "list" of status codes?
1141        */
1142       csp->expected_content_length = 0;
1143       content_length_known = TRUE;
1144       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1145    }
1146
1147    return (content_length_known && ((0 == csp->expected_content_length)
1148             || (csp->expected_content_length <= content_length)));
1149 }
1150
1151
1152 #ifdef FEATURE_CONNECTION_SHARING
1153 /*********************************************************************
1154  *
1155  * Function    :  wait_for_alive_connections
1156  *
1157  * Description :  Waits for alive connections to timeout.
1158  *
1159  * Parameters  :  N/A
1160  *
1161  * Returns     :  N/A
1162  *
1163  *********************************************************************/
1164 static void wait_for_alive_connections(void)
1165 {
1166    int connections_alive = close_unusable_connections();
1167
1168    while (0 < connections_alive)
1169    {
1170       log_error(LOG_LEVEL_CONNECT,
1171          "Waiting for %d connections to timeout.",
1172          connections_alive);
1173       sleep(60);
1174       connections_alive = close_unusable_connections();
1175    }
1176
1177    log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1178
1179 }
1180 #endif /* def FEATURE_CONNECTION_SHARING */
1181
1182
1183 /*********************************************************************
1184  *
1185  * Function    :  save_connection_destination
1186  *
1187  * Description :  Remembers a connection for reuse later on.
1188  *
1189  * Parameters  :
1190  *          1  :  sfd  = Open socket to remember.
1191  *          2  :  http = The destination for the connection.
1192  *          3  :  fwd  = The forwarder settings used.
1193  *          4  :  server_connection  = storage.
1194  *
1195  * Returns     : void
1196  *
1197  *********************************************************************/
1198 static void save_connection_destination(jb_socket sfd,
1199                                         const struct http_request *http,
1200                                         const struct forward_spec *fwd,
1201                                         struct reusable_connection *server_connection)
1202 {
1203    assert(sfd != JB_INVALID_SOCKET);
1204    assert(NULL != http->host);
1205
1206    server_connection->sfd = sfd;
1207    server_connection->host = strdup_or_die(http->host);
1208    server_connection->port = http->port;
1209
1210    assert(NULL != fwd);
1211    assert(server_connection->gateway_host == NULL);
1212    assert(server_connection->gateway_port == 0);
1213    assert(server_connection->forwarder_type == 0);
1214    assert(server_connection->forward_host == NULL);
1215    assert(server_connection->forward_port == 0);
1216
1217    server_connection->forwarder_type = fwd->type;
1218    if (NULL != fwd->gateway_host)
1219    {
1220       server_connection->gateway_host = strdup_or_die(fwd->gateway_host);
1221    }
1222    else
1223    {
1224       server_connection->gateway_host = NULL;
1225    }
1226    server_connection->gateway_port = fwd->gateway_port;
1227    if (NULL != fwd->auth_username)
1228    {
1229       server_connection->auth_username = strdup_or_die(fwd->auth_username);
1230    }
1231    else
1232    {
1233       server_connection->auth_username = NULL;
1234    }
1235    if (NULL != fwd->auth_password)
1236    {
1237       server_connection->auth_password = strdup_or_die(fwd->auth_password);
1238    }
1239    else
1240    {
1241       server_connection->auth_password = NULL;
1242    }
1243
1244    if (NULL != fwd->forward_host)
1245    {
1246       server_connection->forward_host = strdup_or_die(fwd->forward_host);
1247    }
1248    else
1249    {
1250       server_connection->forward_host = NULL;
1251    }
1252    server_connection->forward_port = fwd->forward_port;
1253 }
1254 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1255
1256
1257 /*********************************************************************
1258  *
1259  * Function    : verify_request_length
1260  *
1261  * Description : Checks if we already got the whole client requests
1262  *               and sets CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ if
1263  *               we do.
1264  *
1265  *               Data that doesn't belong to the current request is
1266  *               either thrown away to let the client retry on a clean
1267  *               socket, or stashed to be dealt with after the current
1268  *               request is served.
1269  *
1270  * Parameters  :
1271  *          1  :  csp = Current client state (buffers, headers, etc...)
1272  *
1273  * Returns     :  void
1274  *
1275  *********************************************************************/
1276 static void verify_request_length(struct client_state *csp)
1277 {
1278    unsigned long long buffered_request_bytes =
1279       (unsigned long long)(csp->client_iob->eod - csp->client_iob->cur);
1280
1281    if ((csp->expected_client_content_length != 0)
1282       && (buffered_request_bytes != 0))
1283    {
1284       if (csp->expected_client_content_length >= buffered_request_bytes)
1285       {
1286          csp->expected_client_content_length -= buffered_request_bytes;
1287          log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
1288             "to account for the %llu ones we already got.",
1289             csp->expected_client_content_length, buffered_request_bytes);
1290       }
1291       else
1292       {
1293          assert(csp->client_iob->eod > csp->client_iob->cur + csp->expected_client_content_length);
1294          csp->client_iob->eod = csp->client_iob->cur + csp->expected_client_content_length;
1295          log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
1296             "Marking the server socket tainted after throwing %llu bytes away.",
1297             buffered_request_bytes - csp->expected_client_content_length);
1298          csp->expected_client_content_length = 0;
1299          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1300       }
1301
1302       if (csp->expected_client_content_length == 0)
1303       {
1304          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1305       }
1306    }
1307
1308    if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
1309       && ((csp->client_iob->cur < csp->client_iob->eod)
1310          || (csp->expected_client_content_length != 0)))
1311    {
1312       if (strcmpic(csp->http->gpc, "GET")
1313          && strcmpic(csp->http->gpc, "HEAD")
1314          && strcmpic(csp->http->gpc, "TRACE")
1315          && strcmpic(csp->http->gpc, "OPTIONS")
1316          && strcmpic(csp->http->gpc, "DELETE"))
1317       {
1318          /* XXX: this is an incomplete hack */
1319          csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1320          log_error(LOG_LEVEL_CONNECT, "There better be a request body.");
1321       }
1322       else
1323       {
1324          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1325
1326          if ((csp->config->feature_flags & RUNTIME_FEATURE_TOLERATE_PIPELINING) == 0)
1327          {
1328             csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1329             log_error(LOG_LEVEL_CONNECT,
1330                "Possible pipeline attempt detected. The connection will not "
1331                "be kept alive and we will only serve the first request.");
1332             /* Nuke the pipelined requests from orbit, just to be sure. */
1333             clear_iob(csp->client_iob);
1334          }
1335          else
1336          {
1337             /*
1338              * Keep the pipelined data around for now, we'll deal with
1339              * it once we're done serving the current request.
1340              */
1341             csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
1342             assert(csp->client_iob->eod >= csp->client_iob->cur);
1343             log_error(LOG_LEVEL_CONNECT, "Complete client request followed by "
1344                "%d bytes of pipelined data received.",
1345                (int)(csp->client_iob->eod - csp->client_iob->cur));
1346          }
1347       }
1348    }
1349    else
1350    {
1351       csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1352       log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
1353    }
1354 }
1355
1356
1357 /*********************************************************************
1358  *
1359  * Function    :  mark_server_socket_tainted
1360  *
1361  * Description :  Makes sure we don't reuse a server socket
1362  *                (if we didn't read everything the server sent
1363  *                us reusing the socket would lead to garbage).
1364  *
1365  * Parameters  :
1366  *          1  :  csp = Current client state (buffers, headers, etc...)
1367  *
1368  * Returns     :  void.
1369  *
1370  *********************************************************************/
1371 static void mark_server_socket_tainted(struct client_state *csp)
1372 {
1373    /*
1374     * For consistency we always mark the server socket
1375     * tainted, however, to reduce the log noise we only
1376     * emit a log message if the server socket could have
1377     * actually been reused.
1378     */
1379    if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
1380       && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED))
1381    {
1382       log_error(LOG_LEVEL_CONNECT,
1383          "Marking the server socket %d tainted.",
1384          csp->server_connection.sfd);
1385    }
1386    csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1387 }
1388
1389 /*********************************************************************
1390  *
1391  * Function    :  get_request_line
1392  *
1393  * Description : Read the client request line.
1394  *
1395  * Parameters  :
1396  *          1  :  csp = Current client state (buffers, headers, etc...)
1397  *
1398  * Returns     :  Pointer to request line or NULL in case of errors.
1399  *
1400  *********************************************************************/
1401 static char *get_request_line(struct client_state *csp)
1402 {
1403    char buf[BUFFER_SIZE];
1404    char *request_line = NULL;
1405    int len;
1406
1407    memset(buf, 0, sizeof(buf));
1408
1409    if ((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
1410    {
1411       /*
1412        * If there are multiple pipelined requests waiting,
1413        * the flag will be set again once the next request
1414        * has been parsed.
1415        */
1416       csp->flags &= ~CSP_FLAG_PIPELINED_REQUEST_WAITING;
1417
1418       request_line = get_header(csp->client_iob);
1419       if ((NULL != request_line) && ('\0' != *request_line))
1420       {
1421          return request_line;
1422       }
1423       else
1424       {
1425          log_error(LOG_LEVEL_CONNECT, "No complete request line "
1426             "received yet. Continuing reading from %d.", csp->cfd);
1427       }
1428    }
1429
1430    do
1431    {
1432       if (
1433 #ifdef FUZZ
1434           0 == (csp->flags & CSP_FLAG_FUZZED_INPUT) &&
1435 #endif
1436           !data_is_available(csp->cfd, csp->config->socket_timeout)
1437           )
1438       {
1439          if (socket_is_still_alive(csp->cfd))
1440          {
1441             log_error(LOG_LEVEL_CONNECT,
1442                "No request line on socket %d received in time. Timeout: %d.",
1443                csp->cfd, csp->config->socket_timeout);
1444             write_socket_delayed(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
1445                strlen(CLIENT_CONNECTION_TIMEOUT_RESPONSE),
1446                get_write_delay(csp));
1447          }
1448          else
1449          {
1450             log_error(LOG_LEVEL_CONNECT,
1451                "The client side of the connection on socket %d got "
1452                "closed without sending a complete request line.", csp->cfd);
1453          }
1454          return NULL;
1455       }
1456
1457       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1458
1459       if (len <= 0) return NULL;
1460
1461       /*
1462        * If there is no memory left for buffering the
1463        * request, there is nothing we can do but hang up
1464        */
1465       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1466       {
1467          return NULL;
1468       }
1469
1470       request_line = get_header(csp->client_iob);
1471
1472    } while ((NULL != request_line) && ('\0' == *request_line));
1473
1474    return request_line;
1475
1476 }
1477
1478 enum chunk_status
1479 {
1480    CHUNK_STATUS_MISSING_DATA,
1481    CHUNK_STATUS_BODY_COMPLETE,
1482    CHUNK_STATUS_PARSE_ERROR
1483 };
1484
1485
1486 /*********************************************************************
1487  *
1488  * Function    :  chunked_body_is_complete
1489  *
1490  * Description :  Figures out whether or not a chunked body is complete.
1491  *
1492  *                Currently it always starts at the beginning of the
1493  *                buffer which is somewhat wasteful and prevents Privoxy
1494  *                from starting to forward the correctly parsed chunks
1495  *                as soon as theoretically possible.
1496  *
1497  *                Should be modified to work with a common buffer,
1498  *                and allow the caller to skip already parsed chunks.
1499  *
1500  *                This would allow the function to be used for unbuffered
1501  *                response bodies as well.
1502  *
1503  * Parameters  :
1504  *          1  :  iob = Buffer with the body to check.
1505  *          2  :  length = Length of complete body
1506  *
1507  * Returns     :  Enum with the result of the check.
1508  *
1509  *********************************************************************/
1510 static enum chunk_status chunked_body_is_complete(struct iob *iob, size_t *length)
1511 {
1512    unsigned int chunksize;
1513    char *p = iob->cur;
1514
1515    do
1516    {
1517       /*
1518        * We need at least a single digit, followed by "\r\n",
1519        * followed by an unknown amount of data, followed by "\r\n".
1520        */
1521       if (p + 5 > iob->eod)
1522       {
1523          return CHUNK_STATUS_MISSING_DATA;
1524       }
1525       if (sscanf(p, "%x", &chunksize) != 1)
1526       {
1527          return CHUNK_STATUS_PARSE_ERROR;
1528       }
1529
1530       /*
1531        * We want at least a single digit, followed by "\r\n",
1532        * followed by the specified amount of data, followed by "\r\n".
1533        */
1534       if (p + chunksize + 5 > iob->eod)
1535       {
1536          return CHUNK_STATUS_MISSING_DATA;
1537       }
1538
1539       /* Skip chunk-size. */
1540       p = strstr(p, "\r\n");
1541       if (NULL == p)
1542       {
1543          return CHUNK_STATUS_PARSE_ERROR;
1544       }
1545       /* Move beyond the chunkdata. */
1546       p += 2 + chunksize;
1547
1548       /* Make sure we're still within the buffer and have two bytes left */
1549       if (p + 2 > iob->eod)
1550       {
1551          return CHUNK_STATUS_MISSING_DATA;
1552       }
1553
1554       /* There should be another "\r\n" to skip */
1555       if (memcmp(p, "\r\n", 2))
1556       {
1557          return CHUNK_STATUS_PARSE_ERROR;
1558       }
1559       p += 2;
1560    } while (chunksize > 0U);
1561
1562    *length = (size_t)(p - iob->cur);
1563    assert(*length <= (size_t)(iob->eod - iob->cur));
1564    assert(p <= iob->eod);
1565
1566    return CHUNK_STATUS_BODY_COMPLETE;
1567
1568 }
1569
1570
1571 /*********************************************************************
1572  *
1573  * Function    : receive_chunked_client_request_body
1574  *
1575  * Description : Read the chunk-encoded client request body.
1576  *               Failures are dealt with.
1577  *
1578  * Parameters  :
1579  *          1  :  csp = Current client state (buffers, headers, etc...)
1580  *
1581  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1582  *
1583  *********************************************************************/
1584 static jb_err receive_chunked_client_request_body(struct client_state *csp)
1585 {
1586    size_t body_length;
1587    enum chunk_status status;
1588
1589    while (CHUNK_STATUS_MISSING_DATA ==
1590       (status = chunked_body_is_complete(csp->client_iob, &body_length)))
1591    {
1592       char buf[BUFFER_SIZE];
1593       int len;
1594
1595       if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1596       {
1597          log_error(LOG_LEVEL_ERROR,
1598             "Timeout while waiting for the client body.");
1599          break;
1600       }
1601       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1602       if (len <= 0)
1603       {
1604          log_error(LOG_LEVEL_ERROR,
1605             "Reading the client body failed: %E");
1606          break;
1607       }
1608       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1609       {
1610          break;
1611       }
1612    }
1613    if (status != CHUNK_STATUS_BODY_COMPLETE)
1614    {
1615       write_socket_delayed(csp->cfd, CLIENT_BODY_PARSE_ERROR_RESPONSE,
1616          strlen(CLIENT_BODY_PARSE_ERROR_RESPONSE), get_write_delay(csp));
1617       log_error(LOG_LEVEL_CLF,
1618          "%s - - [%T] \"Failed reading chunked client body\" 400 0", csp->ip_addr_str);
1619       return JB_ERR_PARSE;
1620    }
1621    log_error(LOG_LEVEL_CONNECT,
1622       "Chunked client body completely read. Length: %lu", body_length);
1623    csp->expected_client_content_length = body_length;
1624
1625    return JB_ERR_OK;
1626
1627 }
1628
1629
1630 #ifdef FUZZ
1631 /*********************************************************************
1632  *
1633  * Function    :  fuzz_chunked_transfer_encoding
1634  *
1635  * Description :  Treat the fuzzed input as chunked transfer encoding
1636  *                to check and dechunk.
1637  *
1638  * Parameters  :
1639  *          1  :  csp      = Used to store the data.
1640  *          2  :  fuzz_input_file = File to read the input from.
1641  *
1642  * Returns     : Result of dechunking
1643  *
1644  *********************************************************************/
1645 extern int fuzz_chunked_transfer_encoding(struct client_state *csp, char *fuzz_input_file)
1646 {
1647    size_t length;
1648    size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
1649    enum chunk_status status;
1650
1651    status = chunked_body_is_complete(csp->iob, &length);
1652    if (CHUNK_STATUS_BODY_COMPLETE != status)
1653    {
1654       log_error(LOG_LEVEL_INFO, "Chunked body is incomplete or invalid");
1655    }
1656    if (get_bytes_missing_from_chunked_data(csp->iob->cur, size, 0) == 0)
1657    {
1658       if (CHUNK_STATUS_BODY_COMPLETE != status)
1659       {
1660          log_error(LOG_LEVEL_ERROR,
1661             "There's disagreement about whether or not the chunked body is complete.");
1662       }
1663    }
1664
1665    return (JB_ERR_OK == remove_chunked_transfer_coding(csp->iob->cur, &size));
1666
1667 }
1668
1669
1670 /*********************************************************************
1671  *
1672  * Function    : fuzz_client_request
1673  *
1674  * Description : Try to get a client request from the fuzzed input.
1675  *
1676  * Parameters  :
1677  *          1  :  csp = Current client state (buffers, headers, etc...)
1678  *          2  :  fuzz_input_file = File to read the input from.
1679  *
1680  * Returns     :  Result of fuzzing.
1681  *
1682  *********************************************************************/
1683 extern int fuzz_client_request(struct client_state *csp, char *fuzz_input_file)
1684 {
1685    jb_err err;
1686
1687    csp->cfd = 0;
1688    csp->ip_addr_str = "fuzzer";
1689
1690    if (strcmp(fuzz_input_file, "-") != 0)
1691    {
1692       log_error(LOG_LEVEL_FATAL,
1693          "Fuzzed client requests can currently only be read from stdin (-).");
1694    }
1695    err = receive_client_request(csp);
1696    if (err != JB_ERR_OK)
1697    {
1698       return 1;
1699    }
1700    err = parse_client_request(csp);
1701    if (err != JB_ERR_OK)
1702    {
1703       return 1;
1704    }
1705
1706    return 0;
1707
1708 }
1709 #endif  /* def FUZZ */
1710
1711
1712 #ifdef FEATURE_FORCE_LOAD
1713 /*********************************************************************
1714  *
1715  * Function    :  force_required
1716  *
1717  * Description : Checks a request line to see if it contains
1718  *               the FORCE_PREFIX. If it does, it is removed
1719  *               unless enforcing requests has beend disabled.
1720  *
1721  * Parameters  :
1722  *          1  :  request_line = HTTP request line
1723  *
1724  * Returns     :  TRUE if force is required, FALSE otherwise.
1725  *
1726  *********************************************************************/
1727 static int force_required(const struct client_state *csp, char *request_line)
1728 {
1729    char *p;
1730
1731    p = strstr(request_line, "http://");
1732    if (p != NULL)
1733    {
1734       /* Skip protocol */
1735       p += strlen("http://");
1736    }
1737    else
1738    {
1739       /* Intercepted request usually don't specify the protocol. */
1740       p = request_line;
1741    }
1742
1743    /* Go to the beginning of the path */
1744    p = strstr(p, "/");
1745    if (p == NULL)
1746    {
1747       /*
1748        * If the path is missing the request line is invalid and we
1749        * are done here. The client-visible rejection happens later on.
1750        */
1751       return 0;
1752    }
1753
1754    if (0 == strncmpic(p, FORCE_PREFIX, strlen(FORCE_PREFIX) - 1))
1755    {
1756       if (!(csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS))
1757       {
1758          /* XXX: Should clean more carefully */
1759          strclean(request_line, FORCE_PREFIX);
1760          log_error(LOG_LEVEL_FORCE,
1761             "Enforcing request: \"%s\".", request_line);
1762
1763          return 1;
1764       }
1765       log_error(LOG_LEVEL_FORCE,
1766          "Ignored force prefix in request: \"%s\".", request_line);
1767    }
1768
1769    return 0;
1770
1771 }
1772 #endif /* def FEATURE_FORCE_LOAD */
1773
1774
1775 /*********************************************************************
1776  *
1777  * Function    :  receive_client_request
1778  *
1779  * Description : Read the client's request (more precisely the
1780  *               client headers) and answer it if necessary.
1781  *
1782  * Parameters  :
1783  *          1  :  csp = Current client state (buffers, headers, etc...)
1784  *
1785  * Returns     :  JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1786  *
1787  *********************************************************************/
1788 static jb_err receive_client_request(struct client_state *csp)
1789 {
1790    char buf[BUFFER_SIZE];
1791    char *p;
1792    char *req = NULL;
1793    struct http_request *http;
1794    int len;
1795    jb_err err;
1796
1797    /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1798    struct list header_list;
1799    struct list *headers = &header_list;
1800
1801    /* We don't care if the arriving data is a valid HTTP request or not. */
1802    csp->requests_received_total++;
1803
1804    http = csp->http;
1805
1806    memset(buf, 0, sizeof(buf));
1807
1808    req = get_request_line(csp);
1809    if (req == NULL)
1810    {
1811       mark_server_socket_tainted(csp);
1812       return JB_ERR_PARSE;
1813    }
1814    assert(*req != '\0');
1815
1816    if (client_protocol_is_unsupported(csp, req))
1817    {
1818       return JB_ERR_PARSE;
1819    }
1820
1821 #ifdef FEATURE_FORCE_LOAD
1822    if (force_required(csp, req))
1823    {
1824       csp->flags |= CSP_FLAG_FORCED;
1825    }
1826 #endif /* def FEATURE_FORCE_LOAD */
1827
1828    err = parse_http_request(req, http);
1829    freez(req);
1830    if (JB_ERR_OK != err)
1831    {
1832       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1833          get_write_delay(csp));
1834       /* XXX: Use correct size */
1835       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1836       log_error(LOG_LEVEL_ERROR,
1837          "Couldn't parse request line received from %s: %s",
1838          csp->ip_addr_str, jb_err_to_string(err));
1839
1840       free_http_request(http);
1841       return JB_ERR_PARSE;
1842    }
1843    if (http->ssl && strcmpic(http->gpc, "CONNECT"))
1844    {
1845       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1846          get_write_delay(csp));
1847       /* XXX: Use correct size */
1848       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0",
1849          csp->ip_addr_str);
1850       log_error(LOG_LEVEL_ERROR, "Client %s tried to send a https "
1851          "URL without sending a CONNECT request first",
1852          csp->ip_addr_str);
1853       free_http_request(http);
1854       return JB_ERR_PARSE;
1855    }
1856
1857    /* grab the rest of the client's headers */
1858    init_list(headers);
1859    for (;;)
1860    {
1861       p = get_header(csp->client_iob);
1862
1863       if (p == NULL)
1864       {
1865          /* There are no additional headers to read. */
1866          break;
1867       }
1868
1869       if (*p == '\0')
1870       {
1871          /*
1872           * We didn't receive a complete header
1873           * line yet, get the rest of it.
1874           */
1875          if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1876          {
1877             log_error(LOG_LEVEL_ERROR,
1878                "Client headers did not arrive in time. Timeout: %d",
1879                csp->config->socket_timeout);
1880             destroy_list(headers);
1881             return JB_ERR_PARSE;
1882          }
1883
1884          len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1885          if (len <= 0)
1886          {
1887             log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1888             destroy_list(headers);
1889             return JB_ERR_PARSE;
1890          }
1891
1892          if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1893          {
1894             /*
1895              * If there is no memory left for buffering the
1896              * request, there is nothing we can do but hang up
1897              */
1898             destroy_list(headers);
1899             return JB_ERR_MEMORY;
1900          }
1901       }
1902       else
1903       {
1904          if (!strncmpic(p, "Transfer-Encoding:", 18))
1905          {
1906             /*
1907              * XXX: should be called through sed()
1908              *      but currently can't.
1909              */
1910             client_transfer_encoding(csp, &p);
1911          }
1912          /*
1913           * We were able to read a complete
1914           * header and can finally enlist it.
1915           */
1916          enlist(headers, p);
1917          freez(p);
1918       }
1919    }
1920
1921    if (http->host == NULL)
1922    {
1923       /*
1924        * If we still don't know the request destination,
1925        * the request is invalid or the client uses
1926        * Privoxy without its knowledge.
1927        */
1928       if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1929       {
1930          /*
1931           * Our attempts to get the request destination
1932           * elsewhere failed or Privoxy is configured
1933           * to only accept proxy requests.
1934           *
1935           * An error response has already been sent
1936           * and we're done here.
1937           */
1938          return JB_ERR_PARSE;
1939       }
1940    }
1941
1942 #ifdef FEATURE_CLIENT_TAGS
1943    /* XXX: If the headers were enlisted sooner, passing csp would do. */
1944    set_client_address(csp, headers);
1945    get_tag_list_for_client(csp->client_tags, csp->client_address);
1946 #endif
1947
1948    /*
1949     * Determine the actions for this URL
1950     */
1951 #ifdef FEATURE_TOGGLE
1952    if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1953    {
1954       /* Most compatible set of actions (i.e. none) */
1955       init_current_action(csp->action);
1956    }
1957    else
1958 #endif /* ndef FEATURE_TOGGLE */
1959    {
1960       get_url_actions(csp, http);
1961    }
1962
1963    enlist(csp->headers, http->cmd);
1964
1965    /* Append the previously read headers */
1966    err = list_append_list_unique(csp->headers, headers);
1967    destroy_list(headers);
1968
1969    return err;
1970
1971 }
1972
1973
1974 /*********************************************************************
1975  *
1976  * Function    : parse_client_request
1977  *
1978  * Description : Parses the client's request and decides what to do
1979  *               with it.
1980  *
1981  *               Note that since we're not using select() we could get
1982  *               blocked here if a client connected, then didn't say
1983  *               anything!
1984  *
1985  * Parameters  :
1986  *          1  :  csp = Current client state (buffers, headers, etc...)
1987  *
1988  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1989  *
1990  *********************************************************************/
1991 static jb_err parse_client_request(struct client_state *csp)
1992 {
1993    struct http_request *http = csp->http;
1994    jb_err err;
1995
1996 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1997    if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
1998     && (!strcmpic(csp->http->version, "HTTP/1.1"))
1999     && (csp->http->ssl == 0))
2000    {
2001       /* Assume persistence until further notice */
2002       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2003    }
2004 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2005
2006    if (csp->http->ssl == 0)
2007    {
2008       /*
2009        * This whole block belongs to chat() but currently
2010        * has to be executed before sed().
2011        */
2012       if (csp->flags & CSP_FLAG_CHUNKED_CLIENT_BODY)
2013       {
2014          if (receive_chunked_client_request_body(csp) != JB_ERR_OK)
2015          {
2016             return JB_ERR_PARSE;
2017          }
2018       }
2019       else
2020       {
2021          csp->expected_client_content_length = get_expected_content_length(csp->headers);
2022       }
2023       verify_request_length(csp);
2024    }
2025 #ifndef FEATURE_HTTPS_INSPECTION
2026    else
2027    {
2028       csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
2029    }
2030 #endif
2031
2032    err = sed(csp, FILTER_CLIENT_HEADERS);
2033    if (JB_ERR_OK != err)
2034    {
2035       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2036          csp->ip_addr_str);
2037       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2038          csp->ip_addr_str, csp->http->cmd);
2039       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER), get_write_delay(csp));
2040       return JB_ERR_PARSE;
2041    }
2042    csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2043
2044    /* Check request line for rewrites. */
2045    if ((NULL == csp->headers->first->str)
2046       || (strcmp(http->cmd, csp->headers->first->str) &&
2047          (JB_ERR_OK != change_request_destination(csp))))
2048    {
2049       /*
2050        * A header filter broke the request line - bail out.
2051        */
2052       write_socket_delayed(csp->cfd, MESSED_UP_REQUEST_RESPONSE,
2053          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2054       /* XXX: Use correct size */
2055       log_error(LOG_LEVEL_CLF,
2056          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2057       log_error(LOG_LEVEL_ERROR,
2058          "Invalid request line after applying header filters.");
2059       free_http_request(http);
2060
2061       return JB_ERR_PARSE;
2062    }
2063
2064    if (client_has_unsupported_expectations(csp))
2065    {
2066       return JB_ERR_PARSE;
2067    }
2068
2069    return JB_ERR_OK;
2070
2071 }
2072
2073
2074 /*********************************************************************
2075  *
2076  * Function    : read_http_request_body
2077  *
2078  * Description : Reads remaining request body from the client.
2079  *
2080  * Parameters  :
2081  *          1  :  csp = Current client state (buffers, headers, etc...)
2082  *
2083  * Returns     :  0 on success, anything else is an error.
2084  *
2085  *********************************************************************/
2086 static int read_http_request_body(struct client_state *csp)
2087 {
2088    size_t to_read = csp->expected_client_content_length;
2089    int len;
2090
2091    assert(to_read != 0);
2092
2093    /* check if all data has been already read */
2094    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2095    {
2096       return 0;
2097    }
2098
2099    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2100         to_read > 0 && data_is_available(csp->cfd, csp->config->socket_timeout);
2101         to_read -= (unsigned)len)
2102    {
2103       char buf[BUFFER_SIZE];
2104       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2105
2106       log_error(LOG_LEVEL_CONNECT,
2107          "Waiting for up to %lu bytes of request body from the client.",
2108          max_bytes_to_read);
2109       len = read_socket(csp->cfd, buf, (int)max_bytes_to_read);
2110       if (len <= -1)
2111       {
2112          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s: %E", csp->ip_addr_str);
2113          return 1;
2114       }
2115       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2116       {
2117          return 1;
2118       }
2119       assert(to_read >= len);
2120    }
2121
2122    if (to_read != 0)
2123    {
2124       log_error(LOG_LEVEL_CONNECT,
2125          "Not enough request body has been read: expected %lu more bytes.",
2126          to_read);
2127       return 1;
2128    }
2129    log_error(LOG_LEVEL_CONNECT,
2130       "The last %d bytes of the request body have been read.", len);
2131    return 0;
2132 }
2133
2134
2135 /*********************************************************************
2136  *
2137  * Function    : update_client_headers
2138  *
2139  * Description : Updates the HTTP headers from the client request.
2140  *
2141  * Parameters  :
2142  *          1  :  csp = Current client state (buffers, headers, etc...)
2143  *          2  :  new_content_length = new content length value to set
2144  *
2145  * Returns     :  0 on success, anything else is an error.
2146  *
2147  *********************************************************************/
2148 static int update_client_headers(struct client_state *csp, size_t new_content_length)
2149 {
2150    static const char content_length[] = "Content-Length:";
2151    int updated = 0;
2152    struct list_entry *p;
2153
2154 #ifndef FEATURE_HTTPS_INSPECTION
2155    for (p = csp->headers->first;
2156 #else
2157    for (p = csp->http->client_ssl ? csp->https_headers->first : csp->headers->first;
2158 #endif
2159         !updated  && (p != NULL); p = p->next)
2160    {
2161       /* Header crunch()ed in previous run? -> ignore */
2162       if (p->str == NULL)
2163       {
2164          continue;
2165       }
2166
2167       /* Does the current parser handle this header? */
2168       if (0 == strncmpic(p->str, content_length, sizeof(content_length) - 1))
2169       {
2170          updated = (JB_ERR_OK == header_adjust_content_length((char **)&(p->str), new_content_length));
2171          if (!updated)
2172          {
2173             return 1;
2174          }
2175       }
2176    }
2177
2178    return !updated;
2179 }
2180
2181
2182 /*********************************************************************
2183  *
2184  * Function    : can_buffer_request_body
2185  *
2186  * Description : Checks if the current request body can be stored in
2187  *               the client_iob without hitting buffer limit.
2188  *
2189  * Parameters  :
2190  *          1  : csp = Current client state (buffers, headers, etc...)
2191  *
2192  * Returns     : TRUE if the current request size do not exceed buffer limit
2193  *               FALSE otherwise.
2194  *
2195  *********************************************************************/
2196 static int can_buffer_request_body(const struct client_state *csp)
2197 {
2198    if (!can_add_to_iob(csp->client_iob, csp->config->buffer_limit,
2199                        csp->expected_client_content_length))
2200    {
2201       log_error(LOG_LEVEL_INFO,
2202          "Not filtering request body from %s: buffer limit %lu will be exceeded "
2203          "(content length %llu)", csp->ip_addr_str, csp->config->buffer_limit,
2204          csp->expected_client_content_length);
2205       return FALSE;
2206    }
2207    return TRUE;
2208 }
2209
2210
2211 /*********************************************************************
2212  *
2213  * Function    : send_http_request
2214  *
2215  * Description : Sends the HTTP headers from the client request
2216  *               and all the body data that has already been received.
2217  *
2218  * Parameters  :
2219  *          1  :  csp = Current client state (buffers, headers, etc...)
2220  *
2221  * Returns     :  0 on success, 1 on error, 2 if the request got crunched.
2222  *
2223  *********************************************************************/
2224 static int send_http_request(struct client_state *csp)
2225 {
2226    char *hdr;
2227    int write_failure;
2228
2229    hdr = list_to_text(csp->headers);
2230    if (hdr == NULL)
2231    {
2232       /* FIXME Should handle error properly */
2233       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2234    }
2235    list_remove_all(csp->headers);
2236
2237    /*
2238     * Write the client's (modified) header to the server
2239     * (along with anything else that may be in the buffer)
2240     */
2241    write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
2242    freez(hdr);
2243
2244    if (write_failure)
2245    {
2246       log_error(LOG_LEVEL_CONNECT, "Failed sending request headers to: %s: %E",
2247          csp->http->hostport);
2248       return 1;
2249    }
2250
2251    /* XXX: Filtered data is not sent if there's a pipelined request? */
2252    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2253       && (flush_iob(csp->server_connection.sfd, csp->client_iob, 0) < 0))
2254    {
2255       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2256          csp->http->hostport);
2257       return 1;
2258    }
2259    return 0;
2260 }
2261
2262
2263 #ifdef FEATURE_HTTPS_INSPECTION
2264 /*********************************************************************
2265  *
2266  * Function    : read_https_request_body
2267  *
2268  * Description : Reads remaining request body from the client.
2269  *
2270  * Parameters  :
2271  *          1  :  csp = Current client state (buffers, headers, etc...)
2272  *
2273  * Returns     :  0 on success, anything else is an error.
2274  *
2275  *********************************************************************/
2276 static int read_https_request_body(struct client_state *csp)
2277 {
2278    size_t to_read = csp->expected_client_content_length;
2279    int len;
2280
2281    assert(to_read != 0);
2282
2283    /* check if all data has been already read */
2284    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2285    {
2286       return 0;
2287    }
2288
2289    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2290         to_read > 0 && (is_ssl_pending(&(csp->ssl_client_attr)) ||
2291           data_is_available(csp->cfd, csp->config->socket_timeout));
2292         to_read -= (unsigned)len)
2293    {
2294       unsigned char buf[BUFFER_SIZE];
2295       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2296
2297       log_error(LOG_LEVEL_CONNECT,
2298          "Buffering encrypted client body. Prepared to read up to %lu bytes.",
2299          max_bytes_to_read);
2300       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2301          (unsigned)max_bytes_to_read);
2302       if (len <= 0)
2303       {
2304          log_error(LOG_LEVEL_CONNECT,
2305             "Did not receive the whole encrypted request body from %s",
2306             csp->ip_addr_str);
2307          return 1;
2308       }
2309       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2310       {
2311          return 1;
2312       }
2313       assert(to_read >= len);
2314    }
2315
2316    if (to_read != 0)
2317    {
2318       log_error(LOG_LEVEL_CONNECT,
2319          "Not enough encrypted request body has been read: expected %lu more bytes",
2320          to_read);
2321       return 1;
2322    }
2323
2324    log_error(LOG_LEVEL_CONNECT,
2325       "The last %llu bytes of the encrypted request body have been read",
2326       csp->expected_client_content_length);
2327    return 0;
2328 }
2329
2330
2331 /*********************************************************************
2332  *
2333  * Function    : receive_and_send_encrypted_post_data
2334  *
2335  * Description : Reads remaining request body from the client and sends
2336  *               it to the server.
2337  *
2338  * Parameters  :
2339  *          1  :  csp = Current client state (buffers, headers, etc...)
2340  *
2341  * Returns     :  0 on success, anything else is an error.
2342  *
2343  *********************************************************************/
2344 static int receive_and_send_encrypted_post_data(struct client_state *csp)
2345 {
2346    int content_length_known = csp->expected_client_content_length != 0;
2347
2348    while ((content_length_known && csp->expected_client_content_length != 0) ||
2349       (is_ssl_pending(&(csp->ssl_client_attr)) ||
2350             data_is_available(csp->cfd, csp->config->socket_timeout)))
2351    {
2352       unsigned char buf[BUFFER_SIZE];
2353       int len;
2354       int max_bytes_to_read = sizeof(buf);
2355
2356       if (content_length_known && csp->expected_client_content_length < sizeof(buf))
2357       {
2358          max_bytes_to_read = (int)csp->expected_client_content_length;
2359       }
2360       log_error(LOG_LEVEL_CONNECT,
2361          "Prepared to read up to %d bytes of encrypted request body from the client.",
2362          max_bytes_to_read);
2363       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2364          (unsigned)max_bytes_to_read);
2365       if (len == -1)
2366       {
2367          return 1;
2368       }
2369       if (len == 0)
2370       {
2371          /* XXX: Does this actually happen? */
2372          break;
2373       }
2374       log_error(LOG_LEVEL_CONNECT, "Forwarding %d bytes of encrypted request body.",
2375          len);
2376       len = ssl_send_data(&(csp->ssl_server_attr), buf, (size_t)len);
2377       if (len == -1)
2378       {
2379          return 1;
2380       }
2381       if (csp->expected_client_content_length != 0)
2382       {
2383          if (csp->expected_client_content_length >= len)
2384          {
2385             csp->expected_client_content_length -= (unsigned)len;
2386          }
2387          if (csp->expected_client_content_length == 0)
2388          {
2389             log_error(LOG_LEVEL_CONNECT, "Forwarded the last %d bytes.", len);
2390             break;
2391          }
2392       }
2393    }
2394
2395    log_error(LOG_LEVEL_CONNECT, "Done forwarding encrypted request body.");
2396
2397    return 0;
2398
2399 }
2400
2401
2402 /*********************************************************************
2403  *
2404  * Function    : send_https_request
2405  *
2406  * Description : Sends the HTTP headers from the client request
2407  *               and all the body data that has already been received.
2408  *
2409  * Parameters  :
2410  *          1  :  csp = Current client state (buffers, headers, etc...)
2411  *
2412  * Returns     :  0 on success, anything else is an error.
2413  *
2414  *********************************************************************/
2415 static int send_https_request(struct client_state *csp)
2416 {
2417    char *hdr;
2418    int ret;
2419    long flushed = 0;
2420
2421    hdr = list_to_text(csp->https_headers);
2422    if (hdr == NULL)
2423    {
2424       /* FIXME Should handle error properly */
2425       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header.");
2426    }
2427    list_remove_all(csp->https_headers);
2428
2429    /*
2430     * Write the client's (modified) header to the server
2431     * (along with anything else that may be in the buffer)
2432     */
2433    ret = ssl_send_data(&(csp->ssl_server_attr),
2434       (const unsigned char *)hdr, strlen(hdr));
2435    freez(hdr);
2436
2437    if (ret < 0)
2438    {
2439       log_error(LOG_LEVEL_CONNECT,
2440          "Failed sending encrypted request headers to: %s: %E",
2441          csp->http->hostport);
2442       mark_server_socket_tainted(csp);
2443       return 1;
2444    }
2445
2446    /* XXX: Client body isn't sent if there's pipelined data? */
2447    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2448       && ((flushed = ssl_flush_socket(&(csp->ssl_server_attr),
2449             csp->client_iob)) < 0))
2450    {
2451       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2452          csp->http->hostport);
2453       return 1;
2454    }
2455    if (flushed != 0 || csp->expected_client_content_length != 0)
2456    {
2457       if (csp->expected_client_content_length != 0)
2458       {
2459          if (csp->expected_client_content_length < flushed)
2460          {
2461             log_error(LOG_LEVEL_ERROR,
2462                "Flushed %ld bytes of request body while only expecting %llu.",
2463                flushed, csp->expected_client_content_length);
2464             csp->expected_client_content_length = 0;
2465          }
2466          else
2467          {
2468             log_error(LOG_LEVEL_CONNECT,
2469                "Flushed %ld bytes of request body while expecting %llu.",
2470                flushed, csp->expected_client_content_length);
2471             csp->expected_client_content_length -= (unsigned)flushed;
2472             if (receive_and_send_encrypted_post_data(csp))
2473             {
2474                return 1;
2475             }
2476          }
2477       }
2478       else
2479       {
2480          log_error(LOG_LEVEL_CONNECT,
2481             "Flushed %ld bytes of request body.", flushed);
2482       }
2483    }
2484
2485    log_error(LOG_LEVEL_CONNECT, "Encrypted request sent.");
2486
2487    return 0;
2488
2489 }
2490
2491
2492 /*********************************************************************
2493  *
2494  * Function    :  receive_encrypted_request_headers
2495  *
2496  * Description :  Receives the encrypted request headers when
2497  *                https-inspecting.
2498  *
2499  * Parameters  :
2500  *          1  :  csp = Current client state (buffers, headers, etc...)
2501  *
2502  * Returns     :  JB_ERR_OK on success,
2503  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2504  *
2505  *********************************************************************/
2506 static jb_err receive_encrypted_request_headers(struct client_state *csp)
2507 {
2508    char buf[BUFFER_SIZE];
2509    int len;
2510    char *p;
2511
2512    do
2513    {
2514       log_error(LOG_LEVEL_HEADER, "Waiting for encrypted client headers");
2515       if (!is_ssl_pending(&(csp->ssl_client_attr)) &&
2516           !data_is_available(csp->cfd, csp->config->socket_timeout))
2517       {
2518          log_error(LOG_LEVEL_CONNECT,
2519             "Socket %d timed out while waiting for client headers", csp->cfd);
2520          return JB_ERR_PARSE;
2521       }
2522       len = ssl_recv_data(&(csp->ssl_client_attr),
2523          (unsigned char *)buf, sizeof(buf));
2524       if (len == 0)
2525       {
2526          log_error(LOG_LEVEL_CONNECT,
2527             "Socket %d closed while waiting for client headers", csp->cfd);
2528          return JB_ERR_PARSE;
2529       }
2530       if (len == -1)
2531       {
2532          return JB_ERR_PARSE;
2533       }
2534       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2535       {
2536          return JB_ERR_MEMORY;
2537       }
2538       p = strstr(csp->client_iob->cur, "\r\n\r\n");
2539    } while (p == NULL);
2540
2541    log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2542
2543    return JB_ERR_OK;
2544 }
2545
2546
2547 /*********************************************************************
2548  *
2549  * Function    :  change_encrypted_request_destination
2550  *
2551  * Description :  Parse a (rewritten) request line from an encrypted
2552  *                request and regenerate the http request data.
2553  *
2554  * Parameters  :
2555  *          1  :  csp = Current client state (buffers, headers, etc...)
2556  *
2557  * Returns     :  Forwards the parse_http_request() return code.
2558  *                Terminates in case of memory problems.
2559  *
2560  *********************************************************************/
2561 static jb_err change_encrypted_request_destination(struct client_state *csp)
2562 {
2563    jb_err err;
2564    char *original_host = csp->http->host;
2565    int original_port = csp->http->port;
2566
2567    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
2568       csp->https_headers->first->str);
2569    csp->http->host = NULL;
2570    free_http_request(csp->http);
2571    err = parse_http_request(csp->https_headers->first->str, csp->http);
2572    if (JB_ERR_OK != err)
2573    {
2574       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2575          jb_err_to_string(err));
2576       freez(original_host);
2577       return err;
2578    }
2579
2580    if (csp->http->host == NULL)
2581    {
2582       char port_string[10];
2583       /*
2584        * The rewritten request line did not specify a host
2585        * which means we can use the original host specified
2586        * by the client.
2587        */
2588       csp->http->host = original_host;
2589       csp->http->port = original_port;
2590       log_error(LOG_LEVEL_REDIRECTS, "Keeping the original host: %s",
2591          csp->http->host);
2592       /*
2593        * If the rewritten request line didn't contain a host
2594        * it also didn't contain a port so we can reuse the host
2595        * port.
2596        */
2597       freez(csp->http->hostport);
2598       csp->http->hostport = strdup_or_die(csp->http->host);
2599       snprintf(port_string, sizeof(port_string), ":%d", original_port);
2600       err = string_append(&csp->http->hostport, port_string);
2601       if (err != JB_ERR_OK)
2602       {
2603          log_error(LOG_LEVEL_ERROR, "Failed to rebuild hostport: %s.",
2604             jb_err_to_string(err));
2605          return err;
2606       }
2607
2608       /*
2609        * While the request line didn't mention it,
2610        * we're https-inspecting and want to speak TLS
2611        * with the server.
2612        */
2613       csp->http->server_ssl = 1;
2614       csp->http->ssl = 1;
2615    }
2616    else
2617    {
2618       /* The rewrite filter added a host so we can ditch the original */
2619       freez(original_host);
2620       csp->http->server_ssl = csp->http->ssl;
2621    }
2622
2623    csp->http->client_ssl = 1;
2624
2625    freez(csp->https_headers->first->str);
2626    build_request_line(csp, NULL, &csp->https_headers->first->str);
2627
2628    if (!server_use_ssl(csp))
2629    {
2630       log_error(LOG_LEVEL_REDIRECTS,
2631          "Rewritten request line results in downgrade to http");
2632       /*
2633        * Replace the unencryptd headers received with the
2634        * CONNECT request with the ones we received securely.
2635        */
2636       destroy_list(csp->headers);
2637       csp->headers->first = csp->https_headers->first;
2638       csp->headers->last  = csp->https_headers->last;
2639       csp->https_headers->first = NULL;
2640       csp->https_headers->last = NULL;
2641    }
2642
2643    return JB_ERR_OK;
2644
2645 }
2646
2647
2648 /*********************************************************************
2649  *
2650  * Function    :  process_encrypted_request_headers
2651  *
2652  * Description :  Receives and parses the encrypted headers send
2653  *                by the client when https-inspecting.
2654  *
2655  * Parameters  :
2656  *          1  :  csp = Current client state (buffers, headers, etc...)
2657  *
2658  * Returns     :  JB_ERR_OK on success,
2659  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2660  *
2661  *********************************************************************/
2662 static jb_err process_encrypted_request_headers(struct client_state *csp)
2663 {
2664    char *p;
2665    char *request_line;
2666    jb_err err;
2667    /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2668    struct list header_list;
2669    struct list *headers = &header_list;
2670
2671    assert(csp->ssl_with_client_is_opened);
2672
2673 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2674    if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2675    {
2676       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2677    }
2678 #endif
2679    err = receive_encrypted_request_headers(csp);
2680    if (err != JB_ERR_OK)
2681    {
2682       if (csp->client_iob->cur == NULL ||
2683           csp->client_iob->cur == csp->client_iob->eod)
2684       {
2685          /*
2686           * We did not receive any data, most likely because the
2687           * client is done. Don't log this as a parse failure.
2688           */
2689          return JB_ERR_PARSE;
2690       }
2691       /* XXX: Also used for JB_ERR_MEMORY */
2692       log_error(LOG_LEVEL_ERROR, "Failed to receive encrypted request: %s",
2693          jb_err_to_string(err));
2694       ssl_send_data_delayed(&(csp->ssl_client_attr),
2695          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2696       return err;
2697    }
2698
2699    /* We don't need get_request_line() because the whole HTTP head is buffered. */
2700    request_line = get_header(csp->client_iob);
2701    if (request_line == NULL)
2702    {
2703       log_error(LOG_LEVEL_ERROR, "Failed to get the encrypted request line");
2704       ssl_send_data_delayed(&(csp->ssl_client_attr),
2705          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2706       return JB_ERR_PARSE;
2707    }
2708    assert(*request_line != '\0');
2709
2710    if (client_protocol_is_unsupported(csp, request_line))
2711    {
2712       /*
2713        * If the protocol is unsupported we're done here.
2714        * client_protocol_is_unsupported() took care of sending
2715        * the error response and logging the error message.
2716        */
2717       return JB_ERR_PARSE;
2718    }
2719
2720 #ifdef FEATURE_FORCE_LOAD
2721    if (force_required(csp, request_line))
2722    {
2723       csp->flags |= CSP_FLAG_FORCED;
2724    }
2725 #endif /* def FEATURE_FORCE_LOAD */
2726
2727    free_http_request(csp->http);
2728
2729    err = parse_http_request(request_line, csp->http);
2730    /* XXX: Restore ssl setting. This is ugly */
2731    csp->http->client_ssl = 1;
2732    csp->http->server_ssl = 1;
2733
2734    freez(request_line);
2735    if (JB_ERR_OK != err)
2736    {
2737       ssl_send_data_delayed(&(csp->ssl_client_attr),
2738          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2739       /* XXX: Use correct size */
2740       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2741       log_error(LOG_LEVEL_ERROR,
2742          "Couldn't parse request line received from %s: %s",
2743          csp->ip_addr_str, jb_err_to_string(err));
2744
2745       free_http_request(csp->http);
2746       return JB_ERR_PARSE;
2747    }
2748
2749    /* Parse the rest of the client's headers. */
2750    init_list(headers);
2751    for (;;)
2752    {
2753       p = get_header(csp->client_iob);
2754
2755       if (p == NULL)
2756       {
2757          /* There are no additional headers to read. */
2758          break;
2759       }
2760       enlist(headers, p);
2761       freez(p);
2762    }
2763
2764    if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2765    {
2766       /*
2767        * Our attempts to get the request destination
2768        * elsewhere failed.
2769        */
2770       log_error(LOG_LEVEL_ERROR,
2771          "Failed to get the encrypted request destination");
2772       ssl_send_data_delayed(&(csp->ssl_client_attr),
2773          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2774       destroy_list(headers);
2775
2776       return JB_ERR_PARSE;
2777    }
2778
2779    /* Split the domain we just got for pattern matching */
2780    init_domain_components(csp->http);
2781
2782 #ifdef FEATURE_CLIENT_TAGS
2783    /* XXX: If the headers were enlisted sooner, passing csp would do. */
2784    if (csp->client_address == NULL)
2785    {
2786       set_client_address(csp, headers);
2787       get_tag_list_for_client(csp->client_tags, csp->client_address);
2788    }
2789 #endif
2790
2791 #ifdef FEATURE_TOGGLE
2792    if ((csp->flags & CSP_FLAG_TOGGLED_ON) != 0)
2793 #endif
2794    {
2795       /*
2796        * Determine the actions for this request after
2797        * clearing the ones from the previous one.
2798        */
2799       free_current_action(csp->action);
2800       get_url_actions(csp, csp->http);
2801    }
2802
2803    enlist(csp->https_headers, csp->http->cmd);
2804
2805    /* Append the previously read headers */
2806    err = list_append_list_unique(csp->https_headers, headers);
2807    destroy_list(headers);
2808    if (JB_ERR_OK != err)
2809    {
2810       /* XXX: Send error message */
2811       return err;
2812    }
2813
2814    /* XXX: Work around crash */
2815    csp->error_message = NULL;
2816
2817    /* XXX: Why do this here? */
2818    csp->http->ssl = 1;
2819
2820    err = sed_https(csp);
2821    if (JB_ERR_OK != err)
2822    {
2823       ssl_send_data_delayed(&(csp->ssl_client_attr),
2824          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2825       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2826          csp->ip_addr_str);
2827       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2828          csp->ip_addr_str, csp->http->cmd);
2829       return JB_ERR_PARSE;
2830    }
2831
2832    if ((NULL == csp->https_headers->first->str)
2833       || (strcmp(csp->http->cmd, csp->https_headers->first->str) &&
2834          (JB_ERR_OK != change_encrypted_request_destination(csp))))
2835    {
2836       ssl_send_data_delayed(&(csp->ssl_client_attr),
2837          (const unsigned char *)MESSED_UP_REQUEST_RESPONSE,
2838          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2839       log_error(LOG_LEVEL_ERROR,
2840          "Invalid request line after applying header filters.");
2841       /* XXX: Use correct size */
2842       log_error(LOG_LEVEL_CLF,
2843          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2844
2845       return JB_ERR_PARSE;
2846    }
2847
2848    log_error(LOG_LEVEL_HEADER, "Encrypted request headers processed");
2849    log_error(LOG_LEVEL_REQUEST, "https://%s%s", csp->http->hostport,
2850       csp->http->path);
2851
2852    return err;
2853
2854 }
2855
2856 /*********************************************************************
2857  *
2858  * Function    :  cgi_page_requested
2859  *
2860  * Description :  Checks if a request is for an internal CGI page.
2861  *
2862  * Parameters  :
2863  *          1  :  host = The host requested by the client.
2864  *
2865  * Returns     :  1 if a CGI page has been requested, 0 otherwise
2866  *
2867  *********************************************************************/
2868 static int cgi_page_requested(const char *host)
2869 {
2870    if ((0 == strcmpic(host, CGI_SITE_1_HOST))
2871     || (0 == strcmpic(host, CGI_SITE_1_HOST "."))
2872     || (0 == strcmpic(host, CGI_SITE_2_HOST))
2873     || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
2874    {
2875       return 1;
2876    }
2877
2878    return 0;
2879
2880 }
2881
2882
2883 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2884 /*********************************************************************
2885  *
2886  * Function    :  continue_https_chat
2887  *
2888  * Description :  Behaves similar to chat() but only deals with
2889  *                https-inspected requests that arrive on an already
2890  *                established connection. The first request is always
2891  *                served by chat() which is a lot more complex as it
2892  *                has to deal with forwarding settings and connection
2893  *                failures etc.
2894  *
2895  *                If a connection to the server has already been
2896  *                opened it is reused unless the request is blocked
2897  *                or the forwarder changed.
2898  *
2899  *                If a connection to the server has not yet been
2900  *                opened (because the previous request was crunched),
2901  *                or the forwarder changed, the connection is dropped
2902  *                so that the client retries on a fresh one.
2903  *
2904  * Parameters  :
2905  *          1  :  csp = Current client state (buffers, headers, etc...)
2906  *
2907  * Returns     :  Nothing.
2908  *
2909  *********************************************************************/
2910 static void continue_https_chat(struct client_state *csp)
2911 {
2912    const struct forward_spec *fwd;
2913
2914    if (JB_ERR_OK != process_encrypted_request_headers(csp))
2915    {
2916       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2917       return;
2918    }
2919
2920 #if defined(FEATURE_STATISTICS) && defined(MUTEX_LOCKS_AVAILABLE)
2921    privoxy_mutex_lock(&block_statistics_mutex);
2922    number_of_requests_received++;
2923    privoxy_mutex_unlock(&block_statistics_mutex);
2924 #endif
2925
2926    csp->requests_received_total++;
2927
2928    /*
2929     * We have an encrypted request. Check if one of the crunchers wants it.
2930     */
2931    if (crunch_response_triggered(csp, crunchers_all))
2932    {
2933       /*
2934        * Yes. The client got the crunch response and we're done here.
2935        */
2936       return;
2937    }
2938    if (csp->ssl_with_server_is_opened == 0)
2939    {
2940       log_error(LOG_LEVEL_CONNECT,
2941          "Dropping the client connection on socket %d. "
2942          "The server connection has not been established yet.",
2943          csp->cfd);
2944       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2945       return;
2946    }
2947    assert(csp->server_connection.sfd != JB_INVALID_SOCKET);
2948
2949    if (csp->expected_client_content_length != 0 &&
2950       (client_body_filters_enabled(csp->action) ||
2951        client_body_taggers_enabled(csp->action)) &&
2952       can_buffer_request_body(csp))
2953    {
2954       int content_modified;
2955
2956       if (read_https_request_body(csp))
2957       {
2958          /* XXX: handle */
2959          return;
2960       }
2961       if (client_body_taggers_enabled(csp->action))
2962       {
2963          execute_client_body_taggers(csp, csp->expected_client_content_length);
2964          if (crunch_response_triggered(csp, crunchers_all))
2965          {
2966             /*
2967              * Yes. The client got the crunch response and we're done here.
2968              */
2969             return;
2970          }
2971       }
2972       if (client_body_filters_enabled(csp->action))
2973       {
2974          size_t modified_content_length = csp->expected_client_content_length;
2975          content_modified = execute_client_body_filters(csp,
2976             &modified_content_length);
2977          if ((content_modified == 1) &&
2978             (modified_content_length != csp->expected_client_content_length) &&
2979             update_client_headers(csp, modified_content_length))
2980          {
2981             /* XXX: Send error response */
2982             log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2983             return;
2984          }
2985       }
2986       csp->expected_client_content_length = 0;
2987    }
2988
2989    fwd = forward_url(csp, csp->http);
2990    if (!connection_destination_matches(&csp->server_connection, csp->http, fwd))
2991    {
2992       log_error(LOG_LEVEL_CONNECT,
2993          "Dropping the client connection on socket %d with "
2994          "server socket %d connected to %s. The forwarder has changed.",
2995          csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
2996       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2997       return;
2998    }
2999
3000    log_applied_actions(csp->action);
3001
3002    log_error(LOG_LEVEL_CONNECT,
3003       "Reusing server socket %d connected to %s. Requests already sent: %u.",
3004       csp->server_connection.sfd, csp->server_connection.host,
3005       csp->server_connection.requests_sent_total);
3006
3007    if (send_https_request(csp))
3008    {
3009       /*
3010        * Most likely the server connection timed out. We can't easily
3011        * create a new one so simply drop the client connection without a
3012        * error response to let the client retry.
3013        */
3014       log_error(LOG_LEVEL_CONNECT,
3015          "Dropping client connection on socket %d. "
3016          "Forwarding the encrypted client request failed.",
3017          csp->cfd);
3018       return;
3019    }
3020    csp->server_connection.request_sent = time(NULL);
3021    csp->server_connection.requests_sent_total++;
3022    handle_established_connection(csp);
3023    freez(csp->receive_buffer);
3024 }
3025 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3026 #endif
3027
3028
3029 /*********************************************************************
3030  *
3031  * Function    :  send_server_headers
3032  *
3033  * Description :  Sends the server headers to the client.
3034  *
3035  * Parameters  :
3036  *          1  :  csp = Current client state (buffers, headers, etc...)
3037  *
3038  * Returns     :  0 on succes, -1 on error.
3039  *
3040  *********************************************************************/
3041 static int send_server_headers(struct client_state *csp)
3042 {
3043    char *server_headers;
3044    int ret;
3045
3046    server_headers = list_to_text(csp->headers);
3047    if (server_headers == NULL)
3048    {
3049       /*
3050        * Memory is too tight to even generate the header.
3051        * Send our static "Out-of-memory" page.
3052        */
3053       log_error(LOG_LEVEL_ERROR,
3054          "Out of memory while trying to send server headers.");
3055       send_crunch_response(csp, cgi_error_memory());
3056       mark_server_socket_tainted(csp);
3057 #ifdef FEATURE_HTTPS_INSPECTION
3058       close_client_and_server_ssl_connections(csp);
3059 #endif
3060       return -1;
3061    }
3062 #ifdef FEATURE_HTTPS_INSPECTION
3063    if (client_use_ssl(csp))
3064    {
3065       ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3066          (const unsigned char *)server_headers, strlen(server_headers),
3067          get_write_delay(csp));
3068    }
3069    else
3070 #endif
3071    {
3072       ret = write_socket_delayed(csp->cfd, server_headers, strlen(server_headers),
3073          get_write_delay(csp));
3074    }
3075    freez(server_headers);
3076    if (ret < 0)
3077    {
3078       log_error(LOG_LEVEL_ERROR, "Failed to send server headers to the client.");
3079       mark_server_socket_tainted(csp);
3080 #ifdef FEATURE_HTTPS_INSPECTION
3081       close_client_and_server_ssl_connections(csp);
3082 #endif
3083       return -1;
3084    }
3085
3086    return 0;
3087
3088 }
3089
3090 /*********************************************************************
3091  *
3092  * Function    :  handle_established_connection
3093  *
3094  * Description :  Shuffle data between client and server once the
3095  *                connection has been established and the request
3096  *                has been sent.
3097  *
3098  * Parameters  :
3099  *          1  :  csp = Current client state (buffers, headers, etc...)
3100  *
3101  * Returns     :  Nothing.
3102  *
3103  *********************************************************************/
3104 static void handle_established_connection(struct client_state *csp)
3105 {
3106    char *p;
3107    int n;
3108 #ifdef HAVE_POLL
3109    struct pollfd poll_fds[2];
3110 #else
3111    fd_set rfds;
3112    jb_socket maxfd;
3113    struct timeval timeout;
3114 #endif
3115    int server_body;
3116    int ms_iis5_hack = 0;
3117    unsigned long long byte_count = 0;
3118    struct http_request *http;
3119    long len = 0; /* for buffer sizes (and negative error codes) */
3120    int buffer_and_filter_content = 0;
3121    unsigned int write_delay;
3122    size_t chunk_offset = 0;
3123 #ifdef FEATURE_HTTPS_INSPECTION
3124    int ret = 0;
3125    int use_ssl_tunnel = 0;
3126    csp->dont_verify_certificate = 0;
3127
3128    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION))
3129    {
3130       /* Pass encrypted content without filtering. */
3131       use_ssl_tunnel = 1;
3132    }
3133 #endif
3134
3135    /* Skeleton for HTTP response, if we should intercept the request */
3136    struct http_response *rsp;
3137 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3138    int watch_client_socket;
3139 #endif
3140
3141    csp->receive_buffer_size = csp->config->receive_buffer_size;
3142    csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
3143    if (csp->receive_buffer == NULL)
3144    {
3145       log_error(LOG_LEVEL_ERROR,
3146          "Out of memory. Failed to allocate the receive buffer.");
3147       rsp = cgi_error_memory();
3148       send_crunch_response(csp, rsp);
3149       return;
3150    }
3151
3152    http = csp->http;
3153
3154 #ifndef HAVE_POLL
3155    maxfd = (csp->cfd > csp->server_connection.sfd) ?
3156       csp->cfd : csp->server_connection.sfd;
3157 #endif
3158
3159    /* pass data between the client and server
3160     * until one or the other shuts down the connection.
3161     */
3162
3163    server_body = 0;
3164
3165 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3166    watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
3167 #endif
3168    write_delay = get_write_delay(csp);
3169
3170    for (;;)
3171    {
3172 #ifdef FEATURE_HTTPS_INSPECTION
3173       if (server_use_ssl(csp) && is_ssl_pending(&(csp->ssl_server_attr)))
3174       {
3175          /*
3176           * It's possible that the TLS library already consumed all the
3177           * data the server intends to send. If that happens poll() and
3178           * select() will no longer see the data as available so we have
3179           * to skip the calls.
3180           */
3181          goto server_wants_to_talk;
3182       }
3183       if (watch_client_socket && client_use_ssl(csp) &&
3184          is_ssl_pending(&(csp->ssl_client_attr)))
3185       {
3186          /*
3187           * The TLS libray may also consume all of the remaining data
3188           * from the client when we're shuffling the data from an
3189           * unbuffered request body to the server.
3190           */
3191          goto client_wants_to_talk;
3192       }
3193 #endif
3194 #ifndef HAVE_POLL
3195       FD_ZERO(&rfds);
3196 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3197       if (!watch_client_socket)
3198       {
3199          maxfd = csp->server_connection.sfd;
3200       }
3201       else
3202 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3203       {
3204          FD_SET(csp->cfd, &rfds);
3205       }
3206
3207       FD_SET(csp->server_connection.sfd, &rfds);
3208 #endif /* ndef HAVE_POLL */
3209
3210 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3211       if (server_body && server_response_is_complete(csp, byte_count))
3212       {
3213          if (csp->expected_content_length == byte_count)
3214          {
3215             log_error(LOG_LEVEL_CONNECT,
3216                "Done reading from server. Content length: %llu as expected. "
3217                "Bytes most recently read: %ld.",
3218                byte_count, len);
3219          }
3220          else
3221          {
3222             log_error(LOG_LEVEL_CONNECT,
3223                "Done reading from server. Expected content length: %llu. "
3224                "Actual content length: %llu. Bytes most recently read: %ld.",
3225                csp->expected_content_length, byte_count, len);
3226          }
3227          len = 0;
3228          /*
3229           * XXX: Should not jump around, handle_established_connection()
3230           * is complicated enough already.
3231           */
3232          goto reading_done;
3233       }
3234 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3235
3236 #ifdef HAVE_POLL
3237       poll_fds[0].fd = csp->cfd;
3238 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3239       if (!watch_client_socket)
3240       {
3241          /*
3242           * Ignore incoming data, but still watch out
3243           * for disconnects etc. These flags are always
3244           * implied anyway but explicitly setting them
3245           * doesn't hurt.
3246           */
3247          poll_fds[0].events = POLLERR|POLLHUP;
3248       }
3249       else
3250 #endif
3251       {
3252          poll_fds[0].events = POLLIN;
3253       }
3254       poll_fds[1].fd = csp->server_connection.sfd;
3255       poll_fds[1].events = POLLIN;
3256       n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
3257 #else
3258       timeout.tv_sec = csp->config->socket_timeout;
3259       timeout.tv_usec = 0;
3260       n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
3261 #endif /* def HAVE_POLL */
3262
3263       /* Server or client not responding in timeout */
3264       if (n == 0)
3265       {
3266          log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
3267             csp->config->socket_timeout, http->url);
3268          if ((byte_count == 0) && (http->ssl == 0))
3269          {
3270             send_crunch_response(csp, error_response(csp, "connection-timeout"));
3271          }
3272          mark_server_socket_tainted(csp);
3273 #ifdef FEATURE_HTTPS_INSPECTION
3274          close_client_and_server_ssl_connections(csp);
3275 #endif
3276          return;
3277       }
3278       else if (n < 0)
3279       {
3280 #ifdef HAVE_POLL
3281          log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
3282 #else
3283          log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
3284 #endif
3285          mark_server_socket_tainted(csp);
3286 #ifdef FEATURE_HTTPS_INSPECTION
3287          close_client_and_server_ssl_connections(csp);
3288 #endif
3289          return;
3290       }
3291
3292       /*
3293        * This is the body of the browser's request,
3294        * just read and write it.
3295        *
3296        * Receives data from browser and sends it to server
3297        *
3298        * XXX: Make sure the client doesn't use pipelining
3299        * behind Privoxy's back.
3300        */
3301 #ifdef HAVE_POLL
3302       if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
3303       {
3304          log_error(LOG_LEVEL_CONNECT,
3305             "The client socket %d has become unusable while "
3306             "the server socket %d is still open.",
3307             csp->cfd, csp->server_connection.sfd);
3308          mark_server_socket_tainted(csp);
3309          break;
3310       }
3311
3312       if (poll_fds[0].revents != 0)
3313 #else
3314       if (FD_ISSET(csp->cfd, &rfds))
3315 #endif /* def HAVE_POLL*/
3316       {
3317          int max_bytes_to_read;
3318
3319 #ifdef FEATURE_HTTPS_INSPECTION
3320          client_wants_to_talk:
3321 #endif
3322
3323          max_bytes_to_read = (int)csp->receive_buffer_size;
3324
3325 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3326          if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
3327          {
3328             if (data_is_available(csp->cfd, 0))
3329             {
3330                /*
3331                 * If the next request is already waiting, we have
3332                 * to stop select()ing the client socket. Otherwise
3333                 * we would always return right away and get nothing
3334                 * else done.
3335                 */
3336                watch_client_socket = 0;
3337                log_error(LOG_LEVEL_CONNECT,
3338                   "Stop watching client socket %d. "
3339                   "There's already another request waiting.",
3340                   csp->cfd);
3341                continue;
3342             }
3343             /*
3344              * If the client socket is set, but there's no data
3345              * available on the socket, the client went fishing
3346              * and continuing talking to the server makes no sense.
3347              */
3348             log_error(LOG_LEVEL_CONNECT,
3349                "The client closed socket %d while "
3350                "the server socket %d is still open.",
3351                csp->cfd, csp->server_connection.sfd);
3352             mark_server_socket_tainted(csp);
3353             break;
3354          }
3355          if (csp->expected_client_content_length != 0)
3356          {
3357             if (csp->expected_client_content_length < csp->receive_buffer_size)
3358             {
3359                max_bytes_to_read = (int)csp->expected_client_content_length;
3360             }
3361             log_error(LOG_LEVEL_CONNECT,
3362                "Waiting for up to %d bytes from the client.",
3363                max_bytes_to_read);
3364          }
3365          assert(max_bytes_to_read <= csp->receive_buffer_size);
3366 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3367
3368 #ifdef FEATURE_HTTPS_INSPECTION
3369          if (client_use_ssl(csp))
3370          {
3371             if (csp->http->status == 101)
3372             {
3373                len = ssl_recv_data(&(csp->ssl_client_attr),
3374                   (unsigned char *)csp->receive_buffer,
3375                   (size_t)max_bytes_to_read);
3376                if (len == -1)
3377                {
3378                   log_error(LOG_LEVEL_ERROR, "Failed to receive data "
3379                      "on client socket %d for an upgraded connection",
3380                      csp->cfd);
3381                   break;
3382                }
3383                if (len == 0)
3384                {
3385                   log_error(LOG_LEVEL_CONNECT, "Done receiving data "
3386                      "on client socket %d for an upgraded connection",
3387                      csp->cfd);
3388                   break;
3389                }
3390                byte_count += (unsigned long long)len;
3391                len = ssl_send_data(&(csp->ssl_server_attr),
3392                   (unsigned char *)csp->receive_buffer, (size_t)len);
3393                if (len == -1)
3394                {
3395                   log_error(LOG_LEVEL_ERROR, "Failed to send data "
3396                      "on server socket %d for an upgraded connection",
3397                      csp->server_connection.sfd);
3398                   break;
3399                }
3400                continue;
3401             }
3402             log_error(LOG_LEVEL_CONNECT, "Breaking with TLS/SSL.");
3403             break;
3404          }
3405          else
3406 #endif /* def FEATURE_HTTPS_INSPECTION */
3407          {
3408             len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
3409
3410             if (len <= 0)
3411             {
3412                /* XXX: not sure if this is necessary. */
3413                mark_server_socket_tainted(csp);
3414                break; /* "game over, man" */
3415             }
3416
3417 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3418             if (csp->expected_client_content_length != 0)
3419             {
3420                assert(len <= max_bytes_to_read);
3421                csp->expected_client_content_length -= (unsigned)len;
3422                log_error(LOG_LEVEL_CONNECT,
3423                   "Expected client content length set to %llu "
3424                   "after reading %ld bytes.",
3425                   csp->expected_client_content_length, len);
3426                if (csp->expected_client_content_length == 0)
3427                {
3428                   log_error(LOG_LEVEL_CONNECT,
3429                      "Done reading from the client.");
3430                   csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
3431                }
3432             }
3433 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3434
3435             if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
3436             {
3437                log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
3438                mark_server_socket_tainted(csp);
3439                return;
3440             }
3441          }
3442          continue;
3443       }
3444
3445       /*
3446        * The server wants to talk. It could be the header or the body.
3447        */
3448 #ifdef HAVE_POLL
3449       if (poll_fds[1].revents != 0)
3450 #else
3451       if (FD_ISSET(csp->server_connection.sfd, &rfds))
3452 #endif /* HAVE_POLL */
3453       {
3454 #ifdef FEATURE_HTTPS_INSPECTION
3455          server_wants_to_talk:
3456 #endif
3457 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3458          /*
3459           * If we are buffering content, we don't want to eat up to
3460           * buffer-limit bytes if the client no longer cares about them.
3461           * If we aren't buffering, however, a dead client socket will be
3462           * noticed pretty much right away anyway, so we can reduce the
3463           * overhead by skipping the check.
3464           */
3465          if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
3466          {
3467 #ifdef _WIN32
3468             log_error(LOG_LEVEL_CONNECT,
3469                "The server still wants to talk, but the client may already have hung up on us.");
3470 #else
3471             log_error(LOG_LEVEL_CONNECT,
3472                "The server still wants to talk, but the client hung up on us.");
3473             mark_server_socket_tainted(csp);
3474 #ifdef FEATURE_HTTPS_INSPECTION
3475             close_client_and_server_ssl_connections(csp);
3476 #endif
3477             return;
3478 #endif /* def _WIN32 */
3479          }
3480 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3481
3482 #ifdef FEATURE_HTTPS_INSPECTION
3483          /*
3484           * Reading data from standard or secured connection (HTTP/HTTPS)
3485           */
3486          if (server_use_ssl(csp))
3487          {
3488             len = ssl_recv_data(&(csp->ssl_server_attr),
3489                (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
3490          }
3491          else
3492 #endif
3493          {
3494             len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
3495                (int)csp->receive_buffer_size);
3496          }
3497
3498          if (len < 0)
3499          {
3500             log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
3501
3502             if ((http->ssl && (csp->fwd == NULL))
3503 #ifdef FEATURE_HTTPS_INSPECTION
3504                && use_ssl_tunnel
3505 #endif
3506                 )
3507             {
3508                /*
3509                 * Just hang up. We already confirmed the client's CONNECT
3510                 * request with status code 200 and unencrypted content is
3511                 * no longer welcome.
3512                 */
3513                log_error(LOG_LEVEL_ERROR,
3514                   "CONNECT already confirmed. Unable to tell the client about the problem.");
3515                return;
3516             }
3517             else if (byte_count)
3518             {
3519                /*
3520                 * Just hang up. We already transmitted the original headers
3521                 * and parts of the original content and therefore missed the
3522                 * chance to send an error message (without risking data corruption).
3523                 *
3524                 * XXX: we could retry with a fancy range request here.
3525                 */
3526                log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
3527                   "Unable to tell the client about the problem.");
3528                mark_server_socket_tainted(csp);
3529 #ifdef FEATURE_HTTPS_INSPECTION
3530                close_client_and_server_ssl_connections(csp);
3531 #endif
3532                return;
3533             }
3534             /*
3535              * XXX: Consider handling the cases above the same.
3536              */
3537             mark_server_socket_tainted(csp);
3538             len = 0;
3539          }
3540
3541 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3542          reading_done:
3543 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3544
3545          /*
3546           * This is guaranteed by allocating with zalloc_or_die()
3547           * and never (intentionally) writing to the last byte.
3548           *
3549           * csp->receive_buffer_size is the size of the part of the
3550           * buffer we intentionally write to, but we actually
3551           * allocated csp->receive_buffer_size+1 bytes so the assertion
3552           * stays within the allocated range.
3553           */
3554          assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
3555
3556          /*
3557           * Add a trailing zero to let be able to use string operations.
3558           * XXX: do we still need this with filter_popups gone?
3559           */
3560          assert(len <= csp->receive_buffer_size);
3561          csp->receive_buffer[len] = '\0';
3562
3563          /*
3564           * Normally, this would indicate that we've read
3565           * as much as the server has sent us and we can
3566           * close the client connection.  However, Microsoft
3567           * in its wisdom has released IIS/5 with a bug that
3568           * prevents it from sending the trailing \r\n in
3569           * a 302 redirect header (and possibly other headers).
3570           * To work around this if we've haven't parsed
3571           * a full header we'll append a trailing \r\n
3572           * and see if this now generates a valid one.
3573           *
3574           * This hack shouldn't have any impacts.  If we've
3575           * already transmitted the header or if this is a
3576           * SSL connection, then we won't bother with this
3577           * hack.  So we only work on partially received
3578           * headers.  If we append a \r\n and this still
3579           * doesn't generate a valid header, then we won't
3580           * transmit anything to the client.
3581           */
3582          if (len == 0)
3583          {
3584
3585             if (server_body || (http->ssl
3586 #ifdef FEATURE_HTTPS_INSPECTION
3587                   && use_ssl_tunnel
3588 #endif
3589                ))
3590             {
3591                /*
3592                 * If we have been buffering up the document,
3593                 * now is the time to apply content modification
3594                 * and send the result to the client.
3595                 */
3596                if (buffer_and_filter_content)
3597                {
3598                   p = execute_content_filters(csp);
3599                   /*
3600                    * If content filtering fails, use the original
3601                    * buffer and length.
3602                    * (see p != NULL ? p : csp->iob->cur below)
3603                    */
3604                   if (NULL == p)
3605                   {
3606                      csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3607                   }
3608 #ifdef FEATURE_COMPRESSION
3609                   else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
3610                      && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
3611                   {
3612                      char *compressed_content = compress_buffer(p,
3613                         (size_t *)&csp->content_length, csp->config->compression_level);
3614                      if (compressed_content != NULL)
3615                      {
3616                         freez(p);
3617                         p = compressed_content;
3618                         csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
3619                      }
3620                   }
3621 #endif
3622
3623                   if (JB_ERR_OK != update_server_headers(csp))
3624                   {
3625                      log_error(LOG_LEVEL_FATAL,
3626                         "Failed to update server headers. after filtering.");
3627                   }
3628
3629                   if (send_server_headers(csp))
3630                   {
3631                      return;
3632                   }
3633
3634 #ifdef FEATURE_HTTPS_INSPECTION
3635                   /*
3636                    * Sending data with standard or secured connection (HTTP/HTTPS)
3637                    */
3638                   if (client_use_ssl(csp))
3639                   {
3640                      if (ssl_send_data_delayed(&(csp->ssl_client_attr),
3641                               (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
3642                               csp->content_length, get_write_delay(csp)) < 0)
3643                      {
3644                         log_error(LOG_LEVEL_ERROR,
3645                            "Failed to send the modified content to the client over TLS");
3646                         freez(p);
3647                         mark_server_socket_tainted(csp);
3648                         close_client_and_server_ssl_connections(csp);
3649                         return;
3650                      }
3651                   }
3652                   else
3653 #endif /* def FEATURE_HTTPS_INSPECTION */
3654                   {
3655                      if (write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
3656                          (size_t)csp->content_length, write_delay))
3657                      {
3658                         log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3659                         freez(p);
3660                         mark_server_socket_tainted(csp);
3661                         return;
3662                      }
3663                   }
3664
3665                   freez(p);
3666                }
3667
3668                break; /* "game over, man" */
3669             }
3670
3671             /*
3672              * This is not the body, so let's pretend the server just sent
3673              * us a blank line.
3674              */
3675             snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
3676             len = (int)strlen(csp->receive_buffer);
3677
3678             /*
3679              * Now, let the normal header parsing algorithm below do its
3680              * job.  If it fails, we'll exit instead of continuing.
3681              */
3682
3683             ms_iis5_hack = 1;
3684          }
3685
3686          /*
3687           * If we're in the body of the server document, just write it to
3688           * the client, unless we need to buffer the body for later
3689           * content-filtering.
3690           */
3691          if (server_body || (http->ssl
3692 #ifdef FEATURE_HTTPS_INSPECTION
3693                && use_ssl_tunnel
3694 #endif
3695             ))
3696          {
3697             if (buffer_and_filter_content)
3698             {
3699                /*
3700                 * If there is no memory left for buffering the content, or the buffer limit
3701                 * has been reached, switch to non-filtering mode, i.e. make & write the
3702                 * header, flush the iob and buf, and get out of the way.
3703                 */
3704                if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3705                {
3706                   long flushed;
3707
3708                   log_error(LOG_LEVEL_INFO,
3709                      "Flushing header and buffers. Stepping back from filtering.");
3710
3711                   if (send_server_headers(csp))
3712                   {
3713                      return;
3714                   }
3715
3716 #ifdef FEATURE_HTTPS_INSPECTION
3717                   /*
3718                    * Sending data with standard or secured connection (HTTP/HTTPS)
3719                    */
3720                   if (client_use_ssl(csp))
3721                   {
3722                      if (((flushed = ssl_flush_socket(&(csp->ssl_client_attr),
3723                                 csp->iob)) < 0)
3724                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3725                               (const unsigned char *)csp->receive_buffer, (size_t)len,
3726                               get_write_delay(csp)) < 0))
3727                      {
3728                         log_error(LOG_LEVEL_CONNECT,
3729                            "Flush header and buffers to client failed");
3730                         mark_server_socket_tainted(csp);
3731                         close_client_and_server_ssl_connections(csp);
3732                         return;
3733                      }
3734                   }
3735                   else
3736 #endif /* def FEATURE_HTTPS_INSPECTION */
3737                   {
3738                      if (((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3739                       || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3740                             write_delay))
3741                      {
3742                         log_error(LOG_LEVEL_CONNECT,
3743                            "Flush header and buffers to client failed: %E");
3744                         mark_server_socket_tainted(csp);
3745                         return;
3746                      }
3747                   }
3748
3749                   /*
3750                    * Reset the byte_count to the amount of bytes we just
3751                    * flushed. len will be added a few lines below.
3752                    */
3753                   byte_count = (unsigned long long)flushed;
3754                   if ((csp->flags & CSP_FLAG_CHUNKED) && (chunk_offset != 0))
3755                   {
3756                      log_error(LOG_LEVEL_CONNECT,
3757                         "Reducing chunk offset %lu by %ld to %lu.", chunk_offset, flushed,
3758                         (chunk_offset - (unsigned)flushed));
3759                      assert(chunk_offset >= flushed); /* XXX: Reachable with malicious input? */
3760                      chunk_offset -= (unsigned)flushed;
3761
3762                      /* Make room in the iob. */
3763                      csp->iob->cur = csp->iob->eod = csp->iob->buf;
3764
3765                      if (add_to_iob(csp->iob, csp->config->buffer_limit,
3766                            csp->receive_buffer, len))
3767                      {
3768                         /* This is not supposed to happen but ... */
3769                         csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
3770                         log_error(LOG_LEVEL_ERROR, "Failed to buffer %ld bytes of "
3771                            "chunk-encoded data after resetting the buffer.", len);
3772                         return;
3773                      }
3774                   }
3775                   buffer_and_filter_content = 0;
3776                   server_body = 1;
3777                }
3778             }
3779             else
3780             {
3781 #ifdef FEATURE_HTTPS_INSPECTION
3782                /*
3783                 * Sending data with standard or secured connection (HTTP/HTTPS)
3784                 */
3785                if (client_use_ssl(csp))
3786                {
3787                   ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3788                      (const unsigned char *)csp->receive_buffer, (size_t)len,
3789                      get_write_delay(csp));
3790                   if (ret < 0)
3791                   {
3792                      log_error(LOG_LEVEL_ERROR,
3793                         "Sending data to client failed");
3794                      mark_server_socket_tainted(csp);
3795                      close_client_and_server_ssl_connections(csp);
3796                      return;
3797                   }
3798                }
3799                else
3800 #endif /* def FEATURE_HTTPS_INSPECTION */
3801                {
3802                   if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3803                         (size_t)len, write_delay))
3804                   {
3805                      log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3806                      mark_server_socket_tainted(csp);
3807                      return;
3808                   }
3809                }
3810                if (csp->flags & CSP_FLAG_CHUNKED)
3811                {
3812                   /*
3813                    * While we don't need the data to filter it, put it in the
3814                    * buffer so we can keep track of the offset to the start of
3815                    * the next chunk and detect when the response is finished.
3816                    */
3817                   size_t encoded_bytes = (size_t)(csp->iob->eod - csp->iob->cur);
3818
3819                   if (csp->config->buffer_limit / 4 < encoded_bytes)
3820                   {
3821                      /*
3822                       * Reset the buffer to reduce the memory footprint.
3823                       */
3824                      log_error(LOG_LEVEL_CONNECT,
3825                         "Reducing the chunk offset from %lu to %lu after "
3826                         "discarding %lu bytes to make room in the buffer.",
3827                         chunk_offset, (chunk_offset - encoded_bytes),
3828                         encoded_bytes);
3829                      chunk_offset -= encoded_bytes;
3830                      csp->iob->cur = csp->iob->eod = csp->iob->buf;
3831                   }
3832                   if (add_to_iob(csp->iob, csp->config->buffer_limit,
3833                      csp->receive_buffer, len))
3834                   {
3835                      /* This is not supposed to happen but ... */
3836                      csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
3837                      log_error(LOG_LEVEL_ERROR,
3838                         "Failed to buffer %ld bytes of chunk-encoded data.",
3839                         len);
3840                      return;
3841                   }
3842                }
3843             }
3844             byte_count += (unsigned long long)len;
3845
3846             if (csp->flags & CSP_FLAG_CHUNKED)
3847             {
3848                int rc;
3849                size_t encoded_bytes = (size_t)(csp->iob->eod - csp->iob->cur);
3850
3851                rc = get_bytes_missing_from_chunked_data(csp->iob->cur, encoded_bytes,
3852                   chunk_offset);
3853                if (rc >= 0)
3854                {
3855                   if (rc != 0)
3856                   {
3857                      chunk_offset = (size_t)rc;
3858                   }
3859
3860                   if (chunked_data_is_complete(csp->iob->cur, encoded_bytes, chunk_offset))
3861                   {
3862                      log_error(LOG_LEVEL_CONNECT,
3863                         "We buffered the last chunk of the response.");
3864                      csp->expected_content_length = byte_count;
3865                      csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3866                   }
3867                }
3868             }
3869
3870             continue;
3871          }
3872          else
3873          {
3874             /*
3875              * We're still looking for the end of the server's header.
3876              * Buffer up the data we just read.  If that fails, there's
3877              * little we can do but send our static out-of-memory page.
3878              */
3879             if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3880             {
3881                log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3882                rsp = cgi_error_memory();
3883                send_crunch_response(csp, rsp);
3884                mark_server_socket_tainted(csp);
3885 #ifdef FEATURE_HTTPS_INSPECTION
3886                close_client_and_server_ssl_connections(csp);
3887 #endif
3888                return;
3889             }
3890
3891             /* Convert iob into something sed() can digest */
3892             if (JB_ERR_PARSE == get_server_headers(csp))
3893             {
3894                if (ms_iis5_hack)
3895                {
3896                   /*
3897                    * Well, we tried our MS IIS/5 hack and it didn't work.
3898                    * The header is incomplete and there isn't anything
3899                    * we can do about it.
3900                    */
3901                   log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3902                      "Applying the MS IIS5 hack didn't help.");
3903                   log_error(LOG_LEVEL_CLF,
3904                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3905 #ifdef FEATURE_HTTPS_INSPECTION
3906                   /*
3907                    * Sending data with standard or secured connection (HTTP/HTTPS)
3908                    */
3909                   if (client_use_ssl(csp))
3910                   {
3911                      ssl_send_data_delayed(&(csp->ssl_client_attr),
3912                         (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3913                         strlen(INVALID_SERVER_HEADERS_RESPONSE), get_write_delay(csp));
3914                   }
3915                   else
3916 #endif /* def FEATURE_HTTPS_INSPECTION */
3917                   {
3918                      write_socket_delayed(csp->cfd,
3919                         INVALID_SERVER_HEADERS_RESPONSE,
3920                         strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3921                   }
3922                   mark_server_socket_tainted(csp);
3923 #ifdef FEATURE_HTTPS_INSPECTION
3924                   close_client_and_server_ssl_connections(csp);
3925 #endif
3926                   return;
3927                }
3928                else
3929                {
3930                   /*
3931                    * Since we have to wait for more from the server before
3932                    * we can parse the headers we just continue here.
3933                    */
3934                   log_error(LOG_LEVEL_CONNECT,
3935                      "Continuing buffering server headers from socket %d. "
3936                      "Bytes most recently read: %ld.", csp->cfd, len);
3937                   continue;
3938                }
3939             }
3940             else
3941             {
3942                /*
3943                 * Account for the content bytes we
3944                 * might have gotten with the headers.
3945                 */
3946                assert(csp->iob->eod >= csp->iob->cur);
3947                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3948             }
3949
3950             /* Did we actually get anything? */
3951             if (NULL == csp->headers->first)
3952             {
3953                if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
3954                {
3955                   log_error(LOG_LEVEL_ERROR,
3956                      "No server or forwarder response received on socket %d. "
3957                      "Closing client socket %d without sending data.",
3958                      csp->server_connection.sfd, csp->cfd);
3959                   log_error(LOG_LEVEL_CLF,
3960                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3961                }
3962                else
3963                {
3964                   log_error(LOG_LEVEL_ERROR,
3965                      "No server or forwarder response received on socket %d.",
3966                      csp->server_connection.sfd);
3967                   send_crunch_response(csp, error_response(csp, "no-server-data"));
3968                }
3969                free_http_request(http);
3970                mark_server_socket_tainted(csp);
3971 #ifdef FEATURE_HTTPS_INSPECTION
3972                close_client_and_server_ssl_connections(csp);
3973 #endif
3974                return;
3975             }
3976
3977             if (!csp->headers->first->str)
3978             {
3979                log_error(LOG_LEVEL_ERROR, "header search: csp->headers->first->str == NULL, assert will be called");
3980             }
3981             assert(csp->headers->first->str);
3982
3983             if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3984                 strncmpic(csp->headers->first->str, "ICY", 3))
3985             {
3986                /*
3987                 * It doesn't look like a HTTP (or Shoutcast) response:
3988                 * tell the client and log the problem.
3989                 */
3990                if (strlen(csp->headers->first->str) > 30)
3991                {
3992                   csp->headers->first->str[30] = '\0';
3993                }
3994                log_error(LOG_LEVEL_ERROR,
3995                   "Invalid server or forwarder response. Starts with: %s",
3996                   csp->headers->first->str);
3997                log_error(LOG_LEVEL_CLF,
3998                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3999 #ifdef FEATURE_HTTPS_INSPECTION
4000                /*
4001                 * Sending data with standard or secured connection (HTTP/HTTPS)
4002                 */
4003                if (client_use_ssl(csp))
4004                {
4005                   ssl_send_data_delayed(&(csp->ssl_client_attr),
4006                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
4007                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
4008                      get_write_delay(csp));
4009                }
4010                else
4011 #endif /* def FEATURE_HTTPS_INSPECTION */
4012                {
4013                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
4014                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
4015                }
4016                free_http_request(http);
4017                mark_server_socket_tainted(csp);
4018 #ifdef FEATURE_HTTPS_INSPECTION
4019                close_client_and_server_ssl_connections(csp);
4020 #endif
4021                return;
4022             }
4023
4024             /*
4025              * Disable redirect checkers, so that they will be only run
4026              * again if the user also enables them through tags.
4027              *
4028              * From a performance point of view it doesn't matter,
4029              * but it prevents duplicated log messages.
4030              */
4031 #ifdef FEATURE_FAST_REDIRECTS
4032             csp->action->flags &= ~ACTION_FAST_REDIRECTS;
4033 #endif
4034             csp->action->flags &= ~ACTION_REDIRECT;
4035
4036             /*
4037              * We have now received the entire server header,
4038              * filter it and send the result to the client
4039              */
4040             if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
4041             {
4042                log_error(LOG_LEVEL_CLF,
4043                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
4044 #ifdef FEATURE_HTTPS_INSPECTION
4045                /*
4046                 * Sending data with standard or secured connection (HTTP/HTTPS)
4047                 */
4048                if (client_use_ssl(csp))
4049                {
4050                   ssl_send_data_delayed(&(csp->ssl_client_attr),
4051                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
4052                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
4053                      get_write_delay(csp));
4054                }
4055                else
4056 #endif
4057                {
4058                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
4059                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
4060                }
4061                free_http_request(http);
4062                mark_server_socket_tainted(csp);
4063 #ifdef FEATURE_HTTPS_INSPECTION
4064                close_client_and_server_ssl_connections(csp);
4065 #endif
4066                return;
4067             }
4068
4069             if ((csp->flags & CSP_FLAG_CHUNKED)
4070                && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET))
4071             {
4072                int rc;
4073                size_t encoded_size = (size_t)(csp->iob->eod - csp->iob->cur);
4074
4075                rc = get_bytes_missing_from_chunked_data(csp->iob->cur, encoded_size,
4076                   chunk_offset);
4077                if (rc >= 0)
4078                {
4079                   if (rc != 0)
4080                   {
4081                      chunk_offset = (size_t)rc;
4082                   }
4083                   if (chunked_data_is_complete(csp->iob->cur, encoded_size, chunk_offset))
4084                   {
4085                      log_error(LOG_LEVEL_CONNECT,
4086                         "Looks like we got the last chunk together with "
4087                         "the server headers. We better stop reading.");
4088                      byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
4089                      csp->expected_content_length = byte_count;
4090                      csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
4091                   }
4092                }
4093             }
4094             csp->server_connection.response_received = time(NULL);
4095
4096             if (crunch_response_triggered(csp, crunchers_light))
4097             {
4098                /*
4099                 * One of the tags created by a server-header
4100                 * tagger triggered a crunch. We already
4101                 * delivered the crunch response to the client
4102                 * and are done here after cleaning up.
4103                 */
4104                mark_server_socket_tainted(csp);
4105 #ifdef FEATURE_HTTPS_INSPECTION
4106                close_client_and_server_ssl_connections(csp);
4107 #endif
4108                return;
4109             }
4110
4111             /* Buffer and pcrs filter this if appropriate. */
4112             buffer_and_filter_content = content_requires_filtering(csp);
4113
4114             if (!buffer_and_filter_content)
4115             {
4116                /*
4117                 * Write the server's (modified) header to
4118                 * the client (along with anything else that
4119                 * may be in the buffer). Use standard or secured
4120                 * connection.
4121                 */
4122                if (send_server_headers(csp))
4123                {
4124                   return;
4125                }
4126 #ifdef FEATURE_HTTPS_INSPECTION
4127                if (client_use_ssl(csp))
4128                {
4129                   if ((len = ssl_flush_socket(&(csp->ssl_client_attr),
4130                            csp->iob)) < 0)
4131                   {
4132                      log_error(LOG_LEVEL_CONNECT,
4133                         "Sending buffered bytes to the client failed");
4134
4135                      /*
4136                       * The write failed, so don't bother mentioning it
4137                       * to the client... it probably can't hear us anyway.
4138                       */
4139                      mark_server_socket_tainted(csp);
4140 #ifdef FEATURE_HTTPS_INSPECTION
4141                      close_client_and_server_ssl_connections(csp);
4142 #endif
4143                      return;
4144                   }
4145                }
4146                else
4147 #endif /* def FEATURE_HTTPS_INSPECTION */
4148                {
4149                   if ((len = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
4150                   {
4151                      log_error(LOG_LEVEL_ERROR,
4152                         "Sending buffered bytes to the client failed.");
4153                      /*
4154                       * The write failed, so don't bother mentioning it
4155                       * to the client... it probably can't hear us anyway.
4156                       */
4157                      mark_server_socket_tainted(csp);
4158                      return;
4159                   }
4160                }
4161                if (csp->flags & CSP_FLAG_CHUNKED &&
4162                  !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET))
4163                {
4164                   /*
4165                    * In case of valid data we shouldn't flush more
4166                    * data than chunk_offset but the data may be invalid.
4167                    */
4168                   if (chunk_offset >= len)
4169                   {
4170                      log_error(LOG_LEVEL_CONNECT,
4171                         "Reducing chunk offset from %lu to %lu after flushing %ld bytes",
4172                         chunk_offset, (chunk_offset - (unsigned)len), len);
4173                      chunk_offset = chunk_offset - (unsigned)len;
4174                   }
4175                   else
4176                   {
4177                      log_error(LOG_LEVEL_CONNECT,
4178                         "Keeping chunk offset at %lu despite flushing %ld bytes",
4179                         chunk_offset, len);
4180                      /*
4181                       * If we can't parse the chunk-encoded data we should
4182                       * not reuse the server connection.
4183                       */
4184                      mark_server_socket_tainted(csp);
4185                   }
4186                }
4187                                 }
4188
4189             /* we're finished with the server's header */
4190
4191             server_body = 1;
4192
4193             /*
4194              * If this was a MS IIS/5 hack then it means the server
4195              * has already closed the connection. Nothing more to read.
4196              * Time to bail.
4197              */
4198             if (ms_iis5_hack)
4199             {
4200                log_error(LOG_LEVEL_ERROR,
4201                   "Closed server connection detected. "
4202                   "Applying the MS IIS5 hack didn't help.");
4203                log_error(LOG_LEVEL_CLF,
4204                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
4205 #ifdef FEATURE_HTTPS_INSPECTION
4206                /*
4207                 * Sending data with standard or secured connection (HTTP/HTTPS)
4208                 */
4209                if (client_use_ssl(csp))
4210                {
4211                   ssl_send_data_delayed(&(csp->ssl_client_attr),
4212                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
4213                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
4214                      get_write_delay(csp));
4215                }
4216                else
4217 #endif /* def FEATURE_HTTPS_INSPECTION */
4218                {
4219                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
4220                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
4221                }
4222                mark_server_socket_tainted(csp);
4223 #ifdef FEATURE_HTTPS_INSPECTION
4224                close_client_and_server_ssl_connections(csp);
4225 #endif
4226                return;
4227             }
4228          }
4229          continue;
4230       }
4231       mark_server_socket_tainted(csp);
4232 #ifdef FEATURE_HTTPS_INSPECTION
4233       close_client_and_server_ssl_connections(csp);
4234 #endif
4235       return; /* huh? we should never get here */
4236    }
4237
4238    if (csp->content_length == 0)
4239    {
4240       /*
4241        * If Privoxy didn't recalculate the Content-Length,
4242        * byte_count is still correct.
4243        */
4244       csp->content_length = byte_count;
4245    }
4246
4247 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4248    if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
4249       && (csp->expected_content_length != byte_count))
4250    {
4251       log_error(LOG_LEVEL_CONNECT,
4252          "Received %llu bytes while expecting %llu.",
4253          byte_count, csp->expected_content_length);
4254       mark_server_socket_tainted(csp);
4255    }
4256 #endif
4257
4258 #ifdef FEATURE_HTTPS_INSPECTION
4259    if (client_use_ssl(csp))
4260    {
4261       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" 200 %llu",
4262          csp->ip_addr_str, http->gpc, http->hostport, http->path,
4263          http->version, csp->content_length);
4264    }
4265    else
4266 #endif
4267    {
4268       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
4269          csp->ip_addr_str, http->ocmd, csp->content_length);
4270    }
4271    csp->server_connection.timestamp = time(NULL);
4272 }
4273
4274
4275 /*********************************************************************
4276  *
4277  * Function    :  chat
4278  *
4279  * Description :  Once a connection from the client has been accepted,
4280  *                this function is called (via serve()) to handle the
4281  *                main business of the communication.  This function
4282  *                returns after dealing with a single request. It can
4283  *                be called multiple times with the same client socket
4284  *                if the client is keeping the connection alive.
4285  *
4286  *                The decision whether or not a client connection will
4287  *                be kept alive is up to the caller which also must
4288  *                close the client socket when done.
4289  *
4290  *                FIXME: chat is nearly thousand lines long.
4291  *                Ridiculous.
4292  *
4293  * Parameters  :
4294  *          1  :  csp = Current client state (buffers, headers, etc...)
4295  *
4296  * Returns     :  Nothing.
4297  *
4298  *********************************************************************/
4299 static void chat(struct client_state *csp)
4300 {
4301    const struct forward_spec *fwd;
4302    struct http_request *http;
4303    /* Skeleton for HTTP response, if we should intercept the request */
4304    struct http_response *rsp;
4305 #ifdef FEATURE_HTTPS_INSPECTION
4306    int use_ssl_tunnel = 0;
4307 #endif
4308
4309    http = csp->http;
4310
4311    if (receive_client_request(csp) != JB_ERR_OK)
4312    {
4313       return;
4314    }
4315
4316 #if defined(FEATURE_STATISTICS) && defined(MUTEX_LOCKS_AVAILABLE)
4317    privoxy_mutex_lock(&block_statistics_mutex);
4318    number_of_requests_received++;
4319    privoxy_mutex_unlock(&block_statistics_mutex);
4320 #endif
4321
4322    if (parse_client_request(csp) != JB_ERR_OK)
4323    {
4324       return;
4325    }
4326
4327 #ifdef FEATURE_HTTPS_INSPECTION
4328    /*
4329     * Setting flags to use old solution with SSL tunnel and to disable
4330     * certificate verification.
4331     */
4332    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION)
4333       && !cgi_page_requested(csp->http->host))
4334    {
4335       use_ssl_tunnel = 1;
4336    }
4337
4338    if (http->ssl && (csp->action->flags & ACTION_IGNORE_CERTIFICATE_ERRORS))
4339    {
4340       csp->dont_verify_certificate = 1;
4341    }
4342 #endif
4343
4344    /*
4345     * build the http request to send to the server
4346     * we have to do one of the following:
4347     *
4348     * create =    use the original HTTP request to create a new
4349     *             HTTP request that has either the path component
4350     *             without the http://domainspec (w/path) or the
4351     *             full orininal URL (w/url)
4352     *             Note that the path and/or the HTTP version may
4353     *             have been altered by now.
4354     *
4355     * SSL proxy = Open a socket to the host:port of the server
4356     *             and create TLS/SSL connection with server and
4357     *             with client. Then behave like mediator between
4358     *             client and server over TLS/SSL.
4359     *
4360     * SSL proxy = Pass the request unchanged if forwarding a CONNECT
4361     *    with     request to a parent proxy. Note that we'll be sending
4362     * forwarding  the CFAIL message ourselves if connecting to the parent
4363     *             fails, but we won't send a CSUCCEED message if it works,
4364     *             since that would result in a double message (ours and the
4365     *             parent's). After sending the request to the parent, we
4366     *             must parse answer and send it to client. If connection
4367     *             with server is established, we do TLS/SSL proxy. Otherwise
4368     *             we send parent response to client and close connections.
4369     *
4370     * here's the matrix:
4371     *                        SSL
4372     *                    0        1
4373     *                +--------+--------+
4374     *                |        |        |
4375     *             0  | create |   SSL  |
4376     *                | w/path |  proxy |
4377     *  Forwarding    +--------+--------+
4378     *                |        |   SSL  |
4379     *             1  | create |  proxy |
4380     *                | w/url  |+forward|
4381     *                +--------+--------+
4382     *
4383     */
4384
4385 #ifdef FEATURE_HTTPS_INSPECTION
4386    /*
4387     * Presetting SSL client and server flags
4388     */
4389    if (http->ssl && !use_ssl_tunnel)
4390    {
4391       http->client_ssl = 1;
4392       http->server_ssl = 1;
4393    }
4394    else
4395    {
4396       http->client_ssl = 0;
4397       http->server_ssl = 0;
4398    }
4399 #endif
4400
4401 #ifdef FEATURE_HTTPS_INSPECTION
4402    /*
4403     * Log the request unless we're https inspecting
4404     * in which case we don't have the path yet and
4405     * will log the request later.
4406     */
4407    if (!client_use_ssl(csp))
4408 #endif
4409    {
4410       log_error(LOG_LEVEL_REQUEST, "%s%s", http->hostport, http->path);
4411    }
4412
4413    if (http->ssl && connect_port_is_forbidden(csp))
4414    {
4415       const char *acceptable_connect_ports =
4416          csp->action->string[ACTION_STRING_LIMIT_CONNECT];
4417       assert(NULL != acceptable_connect_ports);
4418       log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
4419          "limit-connect{%s} doesn't allow CONNECT requests to %s",
4420          csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport);
4421       csp->action->flags |= ACTION_BLOCK;
4422       http->ssl = 0;
4423 #ifdef FEATURE_HTTPS_INSPECTION
4424       http->client_ssl = 0;
4425       http->server_ssl = 0;
4426 #endif
4427    }
4428
4429    /*
4430     * We have a request. Check if one of the crunchers wants it
4431     * unless the client wants to use TLS/SSL in which case we
4432     * haven't setup the TLS context yet and will send the crunch
4433     * response later.
4434     */
4435    if (
4436 #ifdef FEATURE_HTTPS_INSPECTION
4437        !client_use_ssl(csp) &&
4438 #endif
4439        crunch_response_triggered(csp, crunchers_all))
4440    {
4441       /*
4442        * Yes. The client got the crunch response and we're done here.
4443        */
4444       return;
4445    }
4446
4447 #ifdef FEATURE_HTTPS_INSPECTION
4448    if (client_use_ssl(csp) && !use_ssl_tunnel)
4449    {
4450       int ret;
4451       /*
4452        * Creating a SSL proxy.
4453        *
4454        * By sending the CSUCCEED message we're lying to the client as
4455        * the connection hasn't actually been established yet. We don't
4456        * establish the connection until we have seen and parsed the
4457        * encrypted client headers.
4458        */
4459       if (write_socket_delayed(csp->cfd, CSUCCEED,
4460             strlen(CSUCCEED), get_write_delay(csp)) != 0)
4461       {
4462          log_error(LOG_LEVEL_ERROR, "Sending SUCCEED to client failed");
4463          return;
4464       }
4465
4466       ret = create_client_ssl_connection(csp);
4467       if (ret != 0)
4468       {
4469          log_error(LOG_LEVEL_ERROR,
4470             "Failed to open a secure connection with the client");
4471          return;
4472       }
4473       if (JB_ERR_OK != process_encrypted_request_headers(csp))
4474       {
4475          close_client_ssl_connection(csp);
4476          return;
4477       }
4478       /*
4479        * We have an encrypted request. Check if one of the crunchers now
4480        * wants it (for example because the previously invisible path was
4481        * required to match).
4482        */
4483       if (crunch_response_triggered(csp, crunchers_all))
4484       {
4485          /*
4486           * Yes. The client got the crunch response and we're done here.
4487           */
4488          return;
4489       }
4490    }
4491 #endif
4492
4493    /* If we need to apply client body filters, buffer the whole request now. */
4494    if (csp->expected_client_content_length != 0 &&
4495       (client_body_filters_enabled(csp->action) ||
4496          client_body_taggers_enabled(csp->action)) &&
4497       can_buffer_request_body(csp))
4498    {
4499       int content_modified;
4500       size_t modified_content_length;
4501
4502 #ifdef FEATURE_HTTPS_INSPECTION
4503       if (client_use_ssl(csp) && read_https_request_body(csp))
4504       {
4505          log_error(LOG_LEVEL_ERROR, "Failed to buffer the encrypted "
4506             "request body to apply filters or taggers.");
4507          log_error(LOG_LEVEL_CLF,
4508             "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, csp->http->cmd);
4509
4510          ssl_send_data_delayed(&(csp->ssl_client_attr),
4511             (const unsigned char *)CLIENT_BODY_BUFFER_ERROR_RESPONSE,
4512             strlen(CLIENT_BODY_BUFFER_ERROR_RESPONSE),
4513             get_write_delay(csp));
4514
4515          return;
4516       }
4517       else
4518 #endif
4519       if (read_http_request_body(csp))
4520       {
4521          log_error(LOG_LEVEL_ERROR,
4522             "Failed to buffer the request body to apply filters or taggers,");
4523          log_error(LOG_LEVEL_CLF,
4524             "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, csp->http->cmd);
4525
4526          write_socket_delayed(csp->cfd, CLIENT_BODY_BUFFER_ERROR_RESPONSE,
4527             strlen(CLIENT_BODY_BUFFER_ERROR_RESPONSE), get_write_delay(csp));
4528
4529          return;
4530       }
4531       if (client_body_taggers_enabled(csp->action))
4532       {
4533          execute_client_body_taggers(csp, csp->expected_client_content_length);
4534          if (crunch_response_triggered(csp, crunchers_all))
4535          {
4536             /*
4537              * Yes. The client got the crunch response and we're done here.
4538              */
4539             return;
4540          }
4541       }
4542       if (client_body_filters_enabled(csp->action))
4543       {
4544          modified_content_length = csp->expected_client_content_length;
4545          content_modified = execute_client_body_filters(csp,
4546             &modified_content_length);
4547          if ((content_modified == 1) &&
4548             (modified_content_length != csp->expected_client_content_length) &&
4549             update_client_headers(csp, modified_content_length))
4550          {
4551             /* XXX: Send error response */
4552             log_error(LOG_LEVEL_HEADER, "Error updating client headers");
4553             return;
4554          }
4555       }
4556       csp->expected_client_content_length = 0;
4557    }
4558
4559    log_applied_actions(csp->action);
4560
4561    /* decide how to route the HTTP request */
4562    fwd = forward_url(csp, http);
4563
4564    freez(csp->headers->first->str);
4565    build_request_line(csp, fwd, &csp->headers->first->str);
4566
4567    if (fwd->forward_host)
4568    {
4569       log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
4570          fwd->forward_host, fwd->forward_port, http->hostport);
4571    }
4572    else
4573    {
4574       log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
4575    }
4576
4577    /* here we connect to the server, gateway, or the forwarder */
4578
4579 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4580    if ((csp->server_connection.sfd != JB_INVALID_SOCKET)
4581       && socket_is_still_alive(csp->server_connection.sfd)
4582       && connection_destination_matches(&csp->server_connection, http, fwd))
4583    {
4584       log_error(LOG_LEVEL_CONNECT,
4585          "Reusing server socket %d connected to %s. Total requests: %u.",
4586          csp->server_connection.sfd, csp->server_connection.host,
4587          csp->server_connection.requests_sent_total);
4588    }
4589    else
4590    {
4591       if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4592       {
4593 #ifdef FEATURE_CONNECTION_SHARING
4594          if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING
4595 #ifdef FEATURE_HTTPS_INSPECTION
4596             && !server_use_ssl(csp)
4597 #endif
4598             )
4599          {
4600             remember_connection(&csp->server_connection);
4601          }
4602          else
4603 #endif /* def FEATURE_CONNECTION_SHARING */
4604          {
4605             log_error(LOG_LEVEL_CONNECT,
4606                "Closing server socket %d connected to %s. Total requests: %u.",
4607                csp->server_connection.sfd, csp->server_connection.host,
4608                csp->server_connection.requests_sent_total);
4609             close_socket(csp->server_connection.sfd);
4610          }
4611          mark_connection_closed(&csp->server_connection);
4612       }
4613 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4614
4615       /*
4616        * Connecting to destination server
4617        */
4618       csp->server_connection.sfd = forwarded_connect(fwd, http, csp);
4619
4620       if (csp->server_connection.sfd == JB_INVALID_SOCKET)
4621       {
4622          if (fwd->type != SOCKS_NONE)
4623          {
4624             /* Socks error. */
4625             rsp = error_response(csp, "forwarding-failed");
4626          }
4627          else if (errno == EINVAL)
4628          {
4629             rsp = error_response(csp, "no-such-domain");
4630          }
4631          else
4632          {
4633             rsp = error_response(csp, "connect-failed");
4634          }
4635
4636          /* Write the answer to the client */
4637          if (rsp != NULL)
4638          {
4639             send_crunch_response(csp, rsp);
4640          }
4641
4642          /*
4643           * Temporary workaround to prevent already-read client
4644           * bodies from being parsed as new requests. For now we
4645           * err on the safe side and throw all the following
4646           * requests under the bus, even if no client body has been
4647           * buffered. A compliant client will repeat the dropped
4648           * requests on an untainted connection.
4649           *
4650           * The proper fix is to discard the no longer needed
4651           * client body in the buffer (if there is one) and to
4652           * continue parsing the bytes that follow.
4653           */
4654 #ifdef FEATURE_HTTPS_INSPECTION
4655          close_client_ssl_connection(csp);
4656 #endif
4657          drain_and_close_socket(csp->cfd);
4658          csp->cfd = JB_INVALID_SOCKET;
4659
4660          return;
4661       }
4662
4663 #ifdef FEATURE_HTTPS_INSPECTION
4664       /*
4665        * Creating TLS/SSL connections with destination server or parent
4666        * proxy. If forwarding is enabled, we must send client request to
4667        * parent proxy and receive, parse and resend parent proxy answer.
4668        */
4669       if (http->ssl && !use_ssl_tunnel)
4670       {
4671          if (fwd->forward_host != NULL)
4672          {
4673             char server_response[BUFFER_SIZE];
4674             int ret = 0;
4675             int len = 0;
4676             char *hdr = list_to_text(csp->headers);
4677             memset(server_response, 0, sizeof(server_response));
4678
4679             if (hdr == NULL)
4680             {
4681                log_error(LOG_LEVEL_FATAL,
4682                   "Out of memory parsing client header");
4683             }
4684             list_remove_all(csp->headers);
4685
4686             /*
4687              * Sending client's CONNECT request to the parent proxy
4688              */
4689             ret = write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
4690
4691             freez(hdr);
4692
4693             if (ret != 0)
4694             {
4695                log_error(LOG_LEVEL_CONNECT,
4696                   "Sending request headers to: %s failed", http->hostport);
4697                mark_server_socket_tainted(csp);
4698                close_client_ssl_connection(csp);
4699                return;
4700             }
4701
4702             /* Waiting for parent proxy server response */
4703             len = read_socket(csp->server_connection.sfd, server_response,
4704                sizeof(server_response)-1);
4705
4706             if (len <= 0)
4707             {
4708                log_error(LOG_LEVEL_ERROR, "No response from parent proxy "
4709                   "server on socket %d.", csp->server_connection.sfd);
4710
4711                rsp = error_response(csp, "no-server-data");
4712                if (rsp)
4713                {
4714                   send_crunch_response(csp, rsp);
4715                }
4716                mark_server_socket_tainted(csp);
4717                close_client_ssl_connection(csp);
4718                return;
4719             }
4720
4721             /*
4722              * Test if the connection to the destination server was
4723              * established successfully by the parent proxy.
4724              */
4725             if (!tunnel_established_successfully(server_response, (unsigned int)len))
4726             {
4727                log_error(LOG_LEVEL_ERROR,
4728                   "The forwarder %s failed to establish a connection with %s",
4729                   fwd->forward_host, http->host);
4730                rsp = error_response(csp, "connect-failed");
4731                if (rsp)
4732                {
4733                   send_crunch_response(csp, rsp);
4734                }
4735                mark_server_socket_tainted(csp);
4736                close_client_ssl_connection(csp);
4737                return;
4738             }
4739          } /* -END- if (fwd->forward_host != NULL) */
4740
4741          /*
4742           * We can now create the TLS/SSL connection with the destination server.
4743           */
4744          int ret = create_server_ssl_connection(csp);
4745          if (ret != 0)
4746          {
4747             if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4748                 csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4749             {
4750                /*
4751                 * If the server certificate is invalid, we must inform
4752                 * the client and then close connection to the client.
4753                 */
4754                ssl_send_certificate_error(csp);
4755                close_client_and_server_ssl_connections(csp);
4756                return;
4757             }
4758             if (csp->server_cert_verification_result == SSL_CERT_NOT_VERIFIED
4759              || csp->server_cert_verification_result == SSL_CERT_VALID)
4760             {
4761                /*
4762                 * The TLS/SSL connection wasn't created but an invalid
4763                 * certificate wasn't detected. Report it as connection
4764                 * failure.
4765                 */
4766                rsp = error_response(csp, "connect-failed");
4767                if (rsp)
4768                {
4769                   send_crunch_response(csp, rsp);
4770                }
4771                close_client_and_server_ssl_connections(csp);
4772                return;
4773             }
4774          }
4775       }/* -END- if (http->ssl) */
4776 #endif /* def FEATURE_HTTPS_INSPECTION */
4777
4778 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4779       save_connection_destination(csp->server_connection.sfd,
4780          http, fwd, &csp->server_connection);
4781       csp->server_connection.keep_alive_timeout =
4782          (unsigned)csp->config->keep_alive_timeout;
4783    }
4784 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4785
4786    csp->server_connection.requests_sent_total++;
4787
4788    if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first))
4789    {
4790       /* Client headers have been sent optimistically */
4791       assert(csp->headers->last == NULL);
4792    }
4793    else if (http->ssl == 0 || (fwd->forward_host
4794 #ifdef FEATURE_HTTPS_INSPECTION
4795          && use_ssl_tunnel
4796 #endif
4797            ))
4798    {
4799       int status = send_http_request(csp);
4800       if (status == 2)
4801       {
4802          /* The request got crunched, a response has been delivered. */
4803          return;
4804       }
4805       if (status != 0)
4806       {
4807          rsp = error_response(csp, "connect-failed");
4808          if (rsp)
4809          {
4810             send_crunch_response(csp, rsp);
4811          }
4812          return;
4813       }
4814    }
4815    else
4816    {
4817       /*
4818        * Using old solution with SSL tunnel or new solution with SSL proxy
4819        */
4820       list_remove_all(csp->headers);
4821 #ifdef FEATURE_HTTPS_INSPECTION
4822       if (use_ssl_tunnel)
4823 #endif
4824       {
4825          /*
4826          * We're running an SSL tunnel and we're not forwarding,
4827          * so just ditch the client headers, send the "connect succeeded"
4828          * message to the client, flush the rest, and get out of the way.
4829          */
4830          if (write_socket_delayed(csp->cfd, CSUCCEED,
4831                strlen(CSUCCEED), get_write_delay(csp)))
4832          {
4833             return;
4834          }
4835       }
4836 #ifdef FEATURE_HTTPS_INSPECTION
4837       else
4838       {
4839          /*
4840           * If server certificate has been verified and is invalid,
4841           * we must inform the client and then close the connection
4842           * with client and server.
4843           */
4844          if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4845              csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4846          {
4847             ssl_send_certificate_error(csp);
4848             close_client_and_server_ssl_connections(csp);
4849             return;
4850          }
4851          if (send_https_request(csp))
4852          {
4853             rsp = error_response(csp, "connect-failed");
4854             if (rsp)
4855             {
4856                send_crunch_response(csp, rsp);
4857             }
4858             close_client_and_server_ssl_connections(csp);
4859             return;
4860          }
4861       }
4862 #endif /* def FEATURE_HTTPS_INSPECTION */
4863       clear_iob(csp->client_iob);
4864    }/* -END- else ... if (http->ssl == 1) */
4865
4866    log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
4867
4868    /* XXX: should the time start earlier for optimistically sent data? */
4869    csp->server_connection.request_sent = time(NULL);
4870
4871    handle_established_connection(csp);
4872    freez(csp->receive_buffer);
4873 }
4874
4875
4876 #ifdef FUZZ
4877 /*********************************************************************
4878  *
4879  * Function    :  fuzz_server_response
4880  *
4881  * Description :  Treat the input as a whole server response.
4882  *
4883  * Parameters  :
4884  *          1  :  csp = Current client state (buffers, headers, etc...)
4885  *          2  :  fuzz_input_file = File to read the input from.
4886  *
4887  * Returns     :  0
4888  *
4889  *********************************************************************/
4890 extern int fuzz_server_response(struct client_state *csp, char *fuzz_input_file)
4891 {
4892    static struct forward_spec fwd; /* Zero'd due to being static */
4893    csp->cfd = 0;
4894
4895    if (strcmp(fuzz_input_file, "-") == 0)
4896    {
4897       /* XXX: Doesn't work yet. */
4898       csp->server_connection.sfd = 0;
4899    }
4900    else
4901    {
4902       csp->server_connection.sfd = open(fuzz_input_file, O_RDONLY);
4903       if (csp->server_connection.sfd == -1)
4904       {
4905          log_error(LOG_LEVEL_FATAL, "Failed to open %s: %E",
4906             fuzz_input_file);
4907       }
4908    }
4909    csp->fwd = &fwd;
4910    csp->content_type |= CT_GIF;
4911    csp->action->flags |= ACTION_DEANIMATE;
4912    csp->action->string[ACTION_STRING_DEANIMATE] = "last";
4913
4914    csp->http->path = strdup_or_die("/");
4915    csp->http->host = strdup_or_die("fuzz.example.org");
4916    csp->http->hostport = strdup_or_die("fuzz.example.org:80");
4917    /* Prevent client socket monitoring */
4918    csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4919    csp->flags |= CSP_FLAG_CHUNKED;
4920
4921    csp->config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
4922    csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4923
4924    csp->content_type |= CT_DECLARED|CT_GIF;
4925
4926    csp->config->socket_timeout = 0;
4927
4928    cgi_init_error_messages();
4929
4930    handle_established_connection(csp);
4931    freez(csp->receive_buffer);
4932
4933    return 0;
4934 }
4935 #endif
4936
4937
4938 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4939 /*********************************************************************
4940  *
4941  * Function    :  prepare_csp_for_next_request
4942  *
4943  * Description :  Put the csp in a mostly vergin state.
4944  *
4945  * Parameters  :
4946  *          1  :  csp = Current client state (buffers, headers, etc...)
4947  *
4948  * Returns     :  N/A
4949  *
4950  *********************************************************************/
4951 static void prepare_csp_for_next_request(struct client_state *csp)
4952 {
4953    csp->content_type = 0;
4954    csp->content_length = 0;
4955    csp->expected_content_length = 0;
4956    csp->expected_client_content_length = 0;
4957    list_remove_all(csp->headers);
4958    clear_iob(csp->iob);
4959    freez(csp->error_message);
4960    free_http_request(csp->http);
4961    destroy_list(csp->headers);
4962 #ifdef FEATURE_HTTPS_INSPECTION
4963    destroy_list(csp->https_headers);
4964 #endif
4965    destroy_list(csp->tags);
4966 #ifdef FEATURE_CLIENT_TAGS
4967    destroy_list(csp->client_tags);
4968    freez(csp->client_address);
4969 #endif
4970    free_current_action(csp->action);
4971    if (NULL != csp->fwd)
4972    {
4973       unload_forward_spec(csp->fwd);
4974       csp->fwd = NULL;
4975    }
4976    /* XXX: Store per-connection flags someplace else. */
4977    csp->flags = (CSP_FLAG_ACTIVE | CSP_FLAG_REUSED_CLIENT_CONNECTION);
4978 #ifdef FEATURE_TOGGLE
4979    if (global_toggle_state)
4980 #endif /* def FEATURE_TOGGLE */
4981    {
4982       csp->flags |= CSP_FLAG_TOGGLED_ON;
4983    }
4984
4985    if (csp->client_iob->eod > csp->client_iob->cur)
4986    {
4987       long bytes_to_shift = csp->client_iob->cur - csp->client_iob->buf;
4988       size_t data_length  = (size_t)(csp->client_iob->eod - csp->client_iob->cur);
4989
4990       assert(bytes_to_shift > 0);
4991       assert(data_length > 0);
4992
4993       log_error(LOG_LEVEL_CONNECT, "Shifting %lu pipelined bytes by %ld bytes",
4994          data_length, bytes_to_shift);
4995       memmove(csp->client_iob->buf, csp->client_iob->cur, data_length);
4996       csp->client_iob->cur = csp->client_iob->buf;
4997       assert(csp->client_iob->eod == csp->client_iob->buf + bytes_to_shift + data_length);
4998       csp->client_iob->eod = csp->client_iob->buf + data_length;
4999       memset(csp->client_iob->eod, '\0', (size_t)bytes_to_shift);
5000
5001       csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
5002    }
5003    else
5004    {
5005       /*
5006        * We mainly care about resetting client_iob->cur so we don't
5007        * waste buffer space at the beginning and don't mess up the
5008        * request restoration done by cgi_show_request().
5009        *
5010        * Freeing the buffer itself isn't technically necessary,
5011        * but makes debugging more convenient.
5012        */
5013       clear_iob(csp->client_iob);
5014    }
5015 }
5016 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
5017
5018
5019 /*********************************************************************
5020  *
5021  * Function    :  serve
5022  *
5023  * Description :  This is little more than chat.  We only "serve" to
5024  *                to close (or remember) any socket that chat may have
5025  *                opened.
5026  *
5027  * Parameters  :
5028  *          1  :  csp = Current client state (buffers, headers, etc...)
5029  *
5030  * Returns     :  N/A
5031  *
5032  *********************************************************************/
5033 static void serve(struct client_state *csp)
5034 {
5035    int config_file_change_detected = 0; /* Only used for debugging */
5036 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
5037 #ifdef FEATURE_CONNECTION_SHARING
5038    static int monitor_thread_running = 0;
5039 #endif /* def FEATURE_CONNECTION_SHARING */
5040    int continue_chatting = 0;
5041
5042    log_error(LOG_LEVEL_CONNECT, "Accepted connection from %s on socket %d",
5043       csp->ip_addr_str, csp->cfd);
5044
5045    do
5046    {
5047       unsigned int latency;
5048
5049 #ifdef FEATURE_HTTPS_INSPECTION
5050       if (continue_chatting && client_use_ssl(csp))
5051       {
5052          continue_https_chat(csp);
5053       }
5054       else
5055 #endif
5056       {
5057          chat(csp);
5058       }
5059
5060       /*
5061        * If the request has been crunched,
5062        * the calculated latency is zero.
5063        */
5064       latency = (unsigned)(csp->server_connection.response_received -
5065          csp->server_connection.request_sent) / 2;
5066
5067       if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
5068          && (csp->flags & CSP_FLAG_CRUNCHED)
5069          && (csp->expected_client_content_length != 0))
5070       {
5071          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
5072          log_error(LOG_LEVEL_CONNECT,
5073             "Tainting client socket %d due to unread data.", csp->cfd);
5074       }
5075
5076       continue_chatting = (csp->config->feature_flags
5077          & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
5078          && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
5079          && (csp->cfd != JB_INVALID_SOCKET)
5080          && (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
5081          && ((csp->flags & CSP_FLAG_SERVER_CONTENT_LENGTH_SET)
5082             || (csp->flags & CSP_FLAG_CHUNKED));
5083
5084       if (!(csp->flags & CSP_FLAG_CRUNCHED)
5085          && (csp->server_connection.sfd != JB_INVALID_SOCKET))
5086       {
5087          if (!(csp->flags & CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET))
5088          {
5089             csp->server_connection.keep_alive_timeout = csp->config->default_server_timeout;
5090          }
5091          if (!(csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
5092             || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
5093             || !socket_is_still_alive(csp->server_connection.sfd)
5094             || !(latency < csp->server_connection.keep_alive_timeout))
5095          {
5096             log_error(LOG_LEVEL_CONNECT,
5097                "Closing server socket %d connected to %s. "
5098                "Keep-alive: %u. Tainted: %u. Socket alive: %u. Timeout: %u.",
5099                csp->server_connection.sfd, (csp->server_connection.host != NULL) ?
5100                csp->server_connection.host : csp->http->host,
5101                0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
5102                0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
5103                socket_is_still_alive(csp->server_connection.sfd),
5104                csp->server_connection.keep_alive_timeout);
5105 #ifdef FEATURE_CONNECTION_SHARING
5106             if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
5107             {
5108                forget_connection(csp->server_connection.sfd);
5109             }
5110 #endif /* def FEATURE_CONNECTION_SHARING */
5111 #ifdef FEATURE_HTTPS_INSPECTION
5112             close_server_ssl_connection(csp);
5113 #endif
5114             close_socket(csp->server_connection.sfd);
5115             mark_connection_closed(&csp->server_connection);
5116 #ifdef FEATURE_HTTPS_INSPECTION
5117             if (continue_chatting && client_use_ssl(csp))
5118             {
5119                /*
5120                 * Close the client socket as well as Privoxy currently
5121                 * can't establish a new server connection when the client
5122                 * socket is reused and would drop the connection in
5123                 * continue_https_chat() anyway.
5124                 */
5125                continue_chatting = 0;
5126                csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
5127                log_error(LOG_LEVEL_CONNECT,
5128                   "Client socket %d is no longer usable. "
5129                   "The server socket has been closed.", csp->cfd);
5130             }
5131 #endif
5132          }
5133       }
5134
5135       if (continue_chatting && any_loaded_file_changed(csp))
5136       {
5137          continue_chatting = 0;
5138          config_file_change_detected = 1;
5139       }
5140 #ifdef FEATURE_HTTPS_INSPECTION
5141       if (continue_chatting && client_use_ssl(csp) &&
5142          csp->ssl_with_client_is_opened == 0)
5143       {
5144          continue_chatting = 0;
5145          log_error(LOG_LEVEL_CONNECT, "Client socket %d is no longer usable. "
5146             "The TLS session has been terminated.", csp->cfd);
5147       }
5148 #endif
5149
5150       if (continue_chatting)
5151       {
5152          if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
5153             && socket_is_still_alive(csp->cfd))
5154          {
5155             log_error(LOG_LEVEL_CONNECT, "Client request %d has been "
5156                "pipelined on socket %d and the socket is still alive.",
5157                csp->requests_received_total+1, csp->cfd);
5158             prepare_csp_for_next_request(csp);
5159             continue;
5160          }
5161
5162          if (0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
5163          {
5164             if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5165             {
5166                log_error(LOG_LEVEL_CONNECT,
5167                   "Waiting for the next client request on socket %d. "
5168                   "Keeping the server socket %d to %s open.",
5169                   csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
5170             }
5171             else
5172             {
5173                log_error(LOG_LEVEL_CONNECT,
5174                   "Waiting for the next client request on socket %d. "
5175                   "No server socket to keep open.", csp->cfd);
5176             }
5177          }
5178
5179          if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
5180             && data_is_available(csp->cfd, (int)csp->config->keep_alive_timeout)
5181             && socket_is_still_alive(csp->cfd))
5182          {
5183             log_error(LOG_LEVEL_CONNECT,
5184                "Data arrived in time on client socket %d. Requests so far: %u",
5185                csp->cfd, csp->requests_received_total);
5186             prepare_csp_for_next_request(csp);
5187          }
5188          else
5189          {
5190 #ifdef FEATURE_CONNECTION_SHARING
5191             if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
5192                && (csp->server_connection.sfd != JB_INVALID_SOCKET)
5193                && (socket_is_still_alive(csp->server_connection.sfd))
5194 #ifdef FEATURE_HTTPS_INSPECTION
5195                && !server_use_ssl(csp)
5196 #endif
5197                 )
5198             {
5199                time_t time_open = time(NULL) - csp->server_connection.timestamp;
5200
5201                if (csp->server_connection.keep_alive_timeout < time_open - (time_t)latency)
5202                {
5203                   break;
5204                }
5205
5206                remember_connection(&csp->server_connection);
5207                csp->server_connection.sfd = JB_INVALID_SOCKET;
5208                drain_and_close_socket(csp->cfd);
5209                csp->cfd = JB_INVALID_SOCKET;
5210                privoxy_mutex_lock(&connection_reuse_mutex);
5211                if (!monitor_thread_running)
5212                {
5213                   monitor_thread_running = 1;
5214                   privoxy_mutex_unlock(&connection_reuse_mutex);
5215                   wait_for_alive_connections();
5216                   privoxy_mutex_lock(&connection_reuse_mutex);
5217                   monitor_thread_running = 0;
5218                }
5219                privoxy_mutex_unlock(&connection_reuse_mutex);
5220             }
5221 #endif /* def FEATURE_CONNECTION_SHARING */
5222             break;
5223          }
5224       }
5225       else if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5226       {
5227          log_error(LOG_LEVEL_CONNECT,
5228             "Closing server socket %d connected to %s. Keep-alive: %u. "
5229             "Tainted: %u. Socket alive: %u. Timeout: %u. "
5230             "Configuration file change detected: %u",
5231             csp->server_connection.sfd, csp->server_connection.host,
5232             0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
5233             0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
5234             socket_is_still_alive(csp->server_connection.sfd),
5235             csp->server_connection.keep_alive_timeout,
5236             config_file_change_detected);
5237       }
5238    } while (continue_chatting);
5239
5240 #else
5241    chat(csp);
5242 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
5243
5244    if (csp->cfd != JB_INVALID_SOCKET)
5245    {
5246       log_error(LOG_LEVEL_CONNECT, "Closing client socket %d. "
5247          "Keep-alive: %u. Socket alive: %u. Data available: %u. "
5248          "Configuration file change detected: %u. Requests received: %u.",
5249          csp->cfd, 0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE),
5250          socket_is_still_alive(csp->cfd), data_is_available(csp->cfd, 0),
5251          config_file_change_detected, csp->requests_received_total);
5252 #ifdef FEATURE_HTTPS_INSPECTION
5253       close_client_ssl_connection(csp);
5254 #endif
5255       drain_and_close_socket(csp->cfd);
5256    }
5257
5258    if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5259    {
5260 #ifdef FEATURE_CONNECTION_SHARING
5261       if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
5262       {
5263          forget_connection(csp->server_connection.sfd);
5264       }
5265 #endif /* def FEATURE_CONNECTION_SHARING */
5266
5267 #ifdef FEATURE_HTTPS_INSPECTION
5268       close_server_ssl_connection(csp);
5269 #endif /* def FEATURE_HTTPS_INSPECTION */
5270
5271       close_socket(csp->server_connection.sfd);
5272    }
5273
5274 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
5275    mark_connection_closed(&csp->server_connection);
5276 #endif
5277
5278    free_csp_resources(csp);
5279
5280    csp->flags &= ~CSP_FLAG_ACTIVE;
5281
5282 }
5283
5284
5285 #ifdef __BEOS__
5286 /*********************************************************************
5287  *
5288  * Function    :  server_thread
5289  *
5290  * Description :  We only exist to call `serve' in a threaded environment.
5291  *
5292  * Parameters  :
5293  *          1  :  data = Current client state (buffers, headers, etc...)
5294  *
5295  * Returns     :  Always 0.
5296  *
5297  *********************************************************************/
5298 static int32 server_thread(void *data)
5299 {
5300    serve((struct client_state *) data);
5301    return 0;
5302
5303 }
5304 #endif
5305
5306
5307 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5308 /*********************************************************************
5309  *
5310  * Function    :  usage
5311  *
5312  * Description :  Print usage info & exit.
5313  *
5314  * Parameters  :  Pointer to argv[0] for identifying ourselves
5315  *
5316  * Returns     :  No. ,-)
5317  *
5318  *********************************************************************/
5319 static void usage(const char *name)
5320 {
5321    printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
5322           "Usage: %s [--config-test] "
5323 #if defined(unix)
5324           "[--chroot] "
5325 #endif /* defined(unix) */
5326           "[--help] "
5327 #if defined(unix)
5328           "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
5329 #endif /* defined(unix) */
5330          "[--version] [configfile]\n",
5331           name);
5332
5333 #ifdef FUZZ
5334    show_fuzz_usage(name);
5335 #endif
5336
5337    printf("Aborting\n");
5338
5339    exit(2);
5340
5341 }
5342 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
5343
5344
5345 #ifdef MUTEX_LOCKS_AVAILABLE
5346 /*********************************************************************
5347  *
5348  * Function    :  privoxy_mutex_lock
5349  *
5350  * Description :  Locks a mutex.
5351  *
5352  * Parameters  :
5353  *          1  :  mutex = The mutex to lock.
5354  *
5355  * Returns     :  Void. May exit in case of errors.
5356  *
5357  *********************************************************************/
5358 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
5359 {
5360 #ifdef FEATURE_PTHREAD
5361    int err = pthread_mutex_lock(mutex);
5362    if (err)
5363    {
5364       if (mutex != &log_mutex)
5365       {
5366          log_error(LOG_LEVEL_FATAL,
5367             "Mutex locking failed: %s.\n", strerror(err));
5368       }
5369       exit(1);
5370    }
5371 #else
5372    EnterCriticalSection(mutex);
5373 #endif /* def FEATURE_PTHREAD */
5374 }
5375
5376
5377 /*********************************************************************
5378  *
5379  * Function    :  privoxy_mutex_unlock
5380  *
5381  * Description :  Unlocks a mutex.
5382  *
5383  * Parameters  :
5384  *          1  :  mutex = The mutex to unlock.
5385  *
5386  * Returns     :  Void. May exit in case of errors.
5387  *
5388  *********************************************************************/
5389 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
5390 {
5391 #ifdef FEATURE_PTHREAD
5392    int err = pthread_mutex_unlock(mutex);
5393    if (err)
5394    {
5395       if (mutex != &log_mutex)
5396       {
5397          log_error(LOG_LEVEL_FATAL,
5398             "Mutex unlocking failed: %s.\n", strerror(err));
5399       }
5400       exit(1);
5401    }
5402 #else
5403    LeaveCriticalSection(mutex);
5404 #endif /* def FEATURE_PTHREAD */
5405 }
5406
5407
5408 /*********************************************************************
5409  *
5410  * Function    :  privoxy_mutex_init
5411  *
5412  * Description :  Prepares a mutex.
5413  *
5414  * Parameters  :
5415  *          1  :  mutex = The mutex to initialize.
5416  *
5417  * Returns     :  Void. May exit in case of errors.
5418  *
5419  *********************************************************************/
5420 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
5421 {
5422 #ifdef FEATURE_PTHREAD
5423    int err = pthread_mutex_init(mutex, 0);
5424    if (err)
5425    {
5426       printf("Fatal error. Mutex initialization failed: %s.\n",
5427          strerror(err));
5428       exit(1);
5429    }
5430 #else
5431    InitializeCriticalSection(mutex);
5432 #endif /* def FEATURE_PTHREAD */
5433 }
5434 #endif /* def MUTEX_LOCKS_AVAILABLE */
5435
5436 /*********************************************************************
5437  *
5438  * Function    :  initialize_mutexes
5439  *
5440  * Description :  Prepares mutexes if mutex support is available.
5441  *
5442  * Parameters  :  None
5443  *
5444  * Returns     :  Void, exits in case of errors.
5445  *
5446  *********************************************************************/
5447 static void initialize_mutexes(void)
5448 {
5449 #ifdef MUTEX_LOCKS_AVAILABLE
5450    /*
5451     * Prepare global mutex semaphores
5452     */
5453
5454 #ifdef FEATURE_HTTPS_INSPECTION
5455    privoxy_mutex_init(&certificate_mutex);
5456    privoxy_mutex_init(&ssl_init_mutex);
5457 #endif
5458
5459    privoxy_mutex_init(&log_mutex);
5460    privoxy_mutex_init(&log_init_mutex);
5461    privoxy_mutex_init(&connection_reuse_mutex);
5462 #ifdef FEATURE_EXTERNAL_FILTERS
5463    privoxy_mutex_init(&external_filter_mutex);
5464 #endif
5465 #ifdef FEATURE_CLIENT_TAGS
5466    privoxy_mutex_init(&client_tags_mutex);
5467 #endif
5468 #ifdef FEATURE_STATISTICS
5469    privoxy_mutex_init(&block_statistics_mutex);
5470 #endif
5471 #ifdef FEATURE_EXTENDED_STATISTICS
5472    privoxy_mutex_init(&filter_statistics_mutex);
5473    privoxy_mutex_init(&block_reason_statistics_mutex);
5474 #endif
5475
5476    /*
5477     * XXX: The assumptions below are a bit naive
5478     * and can cause locks that aren't necessary.
5479     *
5480     * For example older FreeBSD versions (< 6.x?)
5481     * have no gethostbyname_r, but gethostbyname is
5482     * thread safe.
5483     */
5484 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
5485    privoxy_mutex_init(&resolver_mutex);
5486 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
5487    /*
5488     * XXX: should we use a single mutex for
5489     * localtime() and gmtime() as well?
5490     */
5491 #ifndef HAVE_GMTIME_R
5492    privoxy_mutex_init(&gmtime_mutex);
5493 #endif /* ndef HAVE_GMTIME_R */
5494
5495 #ifndef HAVE_LOCALTIME_R
5496    privoxy_mutex_init(&localtime_mutex);
5497 #endif /* ndef HAVE_GMTIME_R */
5498
5499 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
5500    privoxy_mutex_init(&rand_mutex);
5501 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
5502
5503 #endif /* def MUTEX_LOCKS_AVAILABLE */
5504 }
5505
5506 /*********************************************************************
5507  *
5508  * Function    :  main
5509  *
5510  * Description :  Load the config file and start the listen loop.
5511  *                This function is a lot more *sane* with the `load_config'
5512  *                and `listen_loop' functions; although it stills does
5513  *                a *little* too much for my taste.
5514  *
5515  * Parameters  :
5516  *          1  :  argc = Number of parameters (including $0).
5517  *          2  :  argv = Array of (char *)'s to the parameters.
5518  *
5519  * Returns     :  1 if : can't open config file, unrecognized directive,
5520  *                stats requested in multi-thread mode, can't open the
5521  *                log file, can't open the jar file, listen port is invalid,
5522  *                any load fails, and can't bind port.
5523  *
5524  *                Else main never returns, the process must be signaled
5525  *                to terminate execution.  Or, on Windows, use the
5526  *                "File", "Exit" menu option.
5527  *
5528  *********************************************************************/
5529 #ifdef __MINGW32__
5530 int real_main(int argc, char **argv)
5531 #else
5532 int main(int argc, char **argv)
5533 #endif
5534 {
5535    int argc_pos = 0;
5536    int do_config_test = 0;
5537 #ifndef HAVE_ARC4RANDOM
5538    unsigned int random_seed;
5539 #endif
5540 #ifdef unix
5541    struct passwd *pw = NULL;
5542    struct group *grp = NULL;
5543    int do_chroot = 0;
5544    char *pre_chroot_nslookup_to_load_resolver = NULL;
5545 #endif
5546 #ifdef FUZZ
5547    char *fuzz_input_type = NULL;
5548    char *fuzz_input_file = NULL;
5549 #endif
5550
5551    Argc = argc;
5552    Argv = argv;
5553
5554    configfile =
5555 #if !defined(_WIN32)
5556    "config"
5557 #else
5558    "config.txt"
5559 #endif
5560       ;
5561
5562    /* Prepare mutexes if supported and necessary. */
5563    initialize_mutexes();
5564
5565    /* Enable logging until further notice. */
5566    init_log_module();
5567
5568    /*
5569     * Parse the command line arguments
5570     *
5571     * XXX: simply printing usage information in case of
5572     * invalid arguments isn't particularly user friendly.
5573     */
5574    while (++argc_pos < argc)
5575    {
5576 #ifdef _WIN32
5577       /* Check to see if the service must be installed or uninstalled */
5578       if (strncmp(argv[argc_pos], "--install", 9) == 0)
5579       {
5580          const char *pName = argv[argc_pos] + 9;
5581          if (*pName == ':')
5582             pName++;
5583          exit((install_service(pName)) ? 0 : 1);
5584       }
5585       else if (strncmp(argv[argc_pos], "--uninstall", 11) == 0)
5586       {
5587          const char *pName = argv[argc_pos] + 11;
5588          if (*pName == ':')
5589             pName++;
5590          exit((uninstall_service(pName)) ? 0 : 1);
5591       }
5592       else if (strcmp(argv[argc_pos], "--service") == 0)
5593       {
5594          bRunAsService = TRUE;
5595          w32_set_service_cwd();
5596          atexit(w32_service_exit_notify);
5597       }
5598       else
5599 #endif /* defined(_WIN32) */
5600
5601
5602 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5603
5604       if (strcmp(argv[argc_pos], "--help") == 0)
5605       {
5606          usage(argv[0]);
5607       }
5608
5609       else if (strcmp(argv[argc_pos], "--version") == 0)
5610       {
5611          printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
5612          exit(0);
5613       }
5614
5615 #if defined(unix)
5616
5617       else if (strcmp(argv[argc_pos], "--no-daemon") == 0)
5618       {
5619          set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
5620          daemon_mode = 0;
5621       }
5622
5623       else if (strcmp(argv[argc_pos], "--pidfile") == 0)
5624       {
5625          if (++argc_pos == argc) usage(argv[0]);
5626          pidfile = strdup_or_die(argv[argc_pos]);
5627       }
5628
5629       else if (strcmp(argv[argc_pos], "--user") == 0)
5630       {
5631          char *user_arg;
5632          char *group_name;
5633
5634          if (++argc_pos == argc) usage(argv[argc_pos]);
5635
5636          user_arg = strdup_or_die(argv[argc_pos]);
5637          group_name = strchr(user_arg, '.');
5638          if (NULL != group_name)
5639          {
5640             /* Nul-terminate the user name */
5641             *group_name = '\0';
5642
5643             /* Skip the former delimiter to actually reach the group name */
5644             group_name++;
5645
5646             grp = getgrnam(group_name);
5647             if (NULL == grp)
5648             {
5649                log_error(LOG_LEVEL_FATAL, "Group '%s' not found.", group_name);
5650             }
5651          }
5652          pw = getpwnam(user_arg);
5653          if (NULL == pw)
5654          {
5655             log_error(LOG_LEVEL_FATAL, "User '%s' not found.", user_arg);
5656          }
5657
5658          freez(user_arg);
5659       }
5660
5661       else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup") == 0)
5662       {
5663          if (++argc_pos == argc) usage(argv[0]);
5664          pre_chroot_nslookup_to_load_resolver = strdup_or_die(argv[argc_pos]);
5665       }
5666
5667       else if (strcmp(argv[argc_pos], "--chroot") == 0)
5668       {
5669          do_chroot = 1;
5670       }
5671 #endif /* defined(unix) */
5672
5673       else if (strcmp(argv[argc_pos], "--config-test") == 0)
5674       {
5675          do_config_test = 1;
5676       }
5677 #ifdef FUZZ
5678       else if (strcmp(argv[argc_pos], "--fuzz") == 0)
5679       {
5680          argc_pos++;
5681          if (argc < argc_pos + 2) usage(argv[0]);
5682          fuzz_input_type = argv[argc_pos];
5683          argc_pos++;
5684          fuzz_input_file = argv[argc_pos];
5685       }
5686       else if (strcmp(argv[argc_pos], "--stfu") == 0)
5687       {
5688          set_debug_level(LOG_LEVEL_STFU);
5689       }
5690 #endif
5691       else if (argc_pos + 1 != argc)
5692       {
5693          /*
5694           * This is neither the last command line
5695           * option, nor was it recognized before,
5696           * therefore it must be invalid.
5697           */
5698          usage(argv[0]);
5699       }
5700       else
5701
5702 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
5703       {
5704          configfile = argv[argc_pos];
5705       }
5706
5707    } /* -END- while (more arguments) */
5708
5709    show_version(Argv[0]);
5710
5711 #if defined(unix)
5712    if (*configfile != '/')
5713    {
5714       char cwd[BUFFER_SIZE];
5715       char *abs_file;
5716       size_t abs_file_size;
5717
5718       /* make config-filename absolute here */
5719       if (NULL == getcwd(cwd, sizeof(cwd)))
5720       {
5721          perror("failed to get current working directory");
5722          exit(1);
5723       }
5724
5725       basedir = strdup_or_die(cwd);
5726       /* XXX: why + 5? */
5727       abs_file_size = strlen(cwd) + strlen(configfile) + 5;
5728       abs_file = malloc_or_die(abs_file_size);
5729       strlcpy(abs_file, basedir, abs_file_size);
5730       strlcat(abs_file, "/", abs_file_size);
5731       strlcat(abs_file, configfile, abs_file_size);
5732       configfile = abs_file;
5733    }
5734 #endif /* defined unix */
5735
5736
5737    files->next = NULL;
5738    clients->next = NULL;
5739
5740    /* XXX: factor out initialising after the next stable release. */
5741 #ifdef _WIN32
5742    InitWin32();
5743 #endif
5744
5745 #ifndef HAVE_ARC4RANDOM
5746    random_seed = (unsigned int)time(NULL);
5747 #ifdef HAVE_RANDOM
5748    srandom(random_seed);
5749 #else
5750    srand(random_seed);
5751 #endif /* ifdef HAVE_RANDOM */
5752 #endif /* ifndef HAVE_ARC4RANDOM */
5753
5754    /*
5755     * Unix signal handling
5756     *
5757     * Catch the abort, interrupt and terminate signals for a graceful exit
5758     * Catch the hangup signal so the errlog can be reopened.
5759     *
5760     * Ignore the broken pipe signal as connection failures
5761     * are handled when and where they occur without relying
5762     * on a signal.
5763     */
5764 #if !defined(_WIN32)
5765 {
5766    int idx;
5767    const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP };
5768
5769    for (idx = 0; idx < SZ(catched_signals); idx++)
5770    {
5771 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
5772       if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
5773 #else
5774       if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
5775 #endif /* ifdef sun */
5776       {
5777          log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
5778       }
5779    }
5780
5781    if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
5782    {
5783       log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for SIGPIPE: %E");
5784    }
5785
5786 }
5787 #else /* ifdef _WIN32 */
5788 # ifdef _WIN_CONSOLE
5789    /*
5790     * We *are* in a windows console app.
5791     * Print a verbose messages about FAQ's and such
5792     */
5793    printf("%s", win32_blurb);
5794 # endif /* def _WIN_CONSOLE */
5795 #endif /* def _WIN32 */
5796
5797 #ifdef FUZZ
5798    if (fuzz_input_type != NULL)
5799    {
5800       exit(process_fuzzed_input(fuzz_input_type, fuzz_input_file));
5801    }
5802    log_error(LOG_LEVEL_FATAL,
5803       "When compiled with fuzzing support, Privoxy should only be used for fuzzing. "
5804       "Various data structures are static which is unsafe when using threads.");
5805 #endif
5806
5807    if (do_config_test)
5808    {
5809       exit(NULL == load_config());
5810    }
5811
5812    /* Initialize the CGI subsystem */
5813    cgi_init_error_messages();
5814
5815    /*
5816     * If running on unix and without the --no-daemon
5817     * option, become a daemon. I.e. fork, detach
5818     * from tty and get process group leadership
5819     */
5820 #if defined(unix)
5821 {
5822    if (daemon_mode)
5823    {
5824       int fd;
5825       pid_t pid = fork();
5826
5827       if (pid < 0) /* error */
5828       {
5829          perror("fork");
5830          exit(3);
5831       }
5832       else if (pid != 0) /* parent */
5833       {
5834          int status;
5835          pid_t wpid;
5836          /*
5837           * must check for errors
5838           * child died due to missing files aso
5839           */
5840          sleep(1);
5841          wpid = waitpid(pid, &status, WNOHANG);
5842          if (wpid != 0)
5843          {
5844             exit(1);
5845          }
5846          exit(0);
5847       }
5848       /* child */
5849
5850       setsid();
5851
5852       /*
5853        * stderr (fd 2) will be closed later on,
5854        * when the config file has been parsed.
5855        */
5856       close(0);
5857       close(1);
5858
5859       /*
5860        * Reserve fd 0 and 1 to prevent abort() and friends
5861        * from sending stuff to the clients or servers.
5862        */
5863       fd = open("/dev/null", O_RDONLY);
5864       if (fd == -1)
5865       {
5866          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5867       }
5868       else if (fd != 0)
5869       {
5870          if (dup2(fd, 0) == -1)
5871          {
5872             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 0: %E");
5873          }
5874          close(fd);
5875       }
5876       fd = open("/dev/null", O_WRONLY);
5877       if (fd == -1)
5878       {
5879          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5880       }
5881       else if (fd != 1)
5882       {
5883          if (dup2(fd, 1) == -1)
5884          {
5885             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 1: %E");
5886          }
5887          close(fd);
5888       }
5889
5890 #ifdef FEATURE_EXTERNAL_FILTERS
5891       for (fd = 0; fd < 3; fd++)
5892       {
5893          mark_socket_for_close_on_execute(fd);
5894       }
5895 #endif
5896
5897       if (chdir("/") != 0)
5898       {
5899          log_error(LOG_LEVEL_FATAL, "Failed to cd into '/': %E");
5900       }
5901
5902    } /* -END- if (daemon_mode) */
5903
5904    /*
5905     * As soon as we have written the PID file, we can switch
5906     * to the user and group ID indicated by the --user option
5907     */
5908    if (pidfile != NULL)
5909    {
5910       write_pid_file(pidfile);
5911    }
5912    if (NULL != pw)
5913    {
5914       if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
5915       {
5916          log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
5917       }
5918       if (NULL != grp)
5919       {
5920          if (setgroups(1, &grp->gr_gid))
5921          {
5922             log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
5923          }
5924       }
5925       else if (initgroups(pw->pw_name, pw->pw_gid))
5926       {
5927          log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
5928       }
5929       if (do_chroot)
5930       {
5931          if (!pw->pw_dir)
5932          {
5933             log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
5934          }
5935          /* Read the time zone file from /etc before doing chroot. */
5936          tzset();
5937          if (NULL != pre_chroot_nslookup_to_load_resolver
5938              && '\0' != pre_chroot_nslookup_to_load_resolver[0])
5939          {
5940             /* Initialize resolver library. */
5941             (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
5942          }
5943          if (chroot(pw->pw_dir) < 0)
5944          {
5945             log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
5946          }
5947          if (chdir ("/"))
5948          {
5949             log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
5950          }
5951       }
5952       if (setuid(pw->pw_uid))
5953       {
5954          log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
5955       }
5956       if (do_chroot)
5957       {
5958          char putenv_dummy[64];
5959
5960          strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
5961          if (putenv(putenv_dummy) != 0)
5962          {
5963             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
5964          }
5965
5966          snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
5967          if (putenv(putenv_dummy) != 0)
5968          {
5969             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
5970          }
5971       }
5972    }
5973    else if (do_chroot)
5974    {
5975       log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
5976    }
5977 }
5978 #endif /* defined unix */
5979
5980 #ifdef _WIN32
5981    /* This will be FALSE unless the command line specified --service
5982     */
5983    if (bRunAsService)
5984    {
5985       /* Yup, so now we must attempt to establish a connection
5986        * with the service dispatcher. This will only work if this
5987        * process was launched by the service control manager to
5988        * actually run as a service. If this isn't the case, i've
5989        * known it take around 30 seconds or so for the call to return.
5990        */
5991
5992       /* The StartServiceCtrlDispatcher won't return until the service is stopping */
5993       if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
5994       {
5995          /* Service has run, and at this point is now being stopped, so just return */
5996          return 0;
5997       }
5998
5999 #ifdef _WIN_CONSOLE
6000       printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
6001 #endif
6002       /* An error occurred. Usually it's because --service was wrongly specified
6003        * and we were unable to connect to the Service Control Dispatcher because
6004        * it wasn't expecting us and is therefore not listening.
6005        *
6006        * For now, just continue below to call the listen_loop function.
6007        */
6008    }
6009 #endif /* def _WIN32 */
6010
6011    listen_loop();
6012
6013    /* NOTREACHED */
6014    return(-1);
6015
6016 }
6017
6018
6019 /*********************************************************************
6020  *
6021  * Function    :  bind_port_helper
6022  *
6023  * Description :  Bind the listen port.  Handles logging, and aborts
6024  *                on failure.
6025  *
6026  * Parameters  :
6027  *          1  :  haddr = Host address to bind to. Use NULL to bind to
6028  *                        INADDR_ANY.
6029  *          2  :  hport = Specifies port to bind to.
6030  *          3  :  backlog = Listen backlog.
6031  *
6032  * Returns     :  Port that was opened.
6033  *
6034  *********************************************************************/
6035 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog)
6036 {
6037    int result;
6038    jb_socket bfd;
6039
6040    result = bind_port(haddr, hport, backlog, &bfd);
6041
6042    if (result < 0)
6043    {
6044       const char *bind_address = (NULL != haddr) ? haddr : "INADDR_ANY";
6045       switch(result)
6046       {
6047          case -3:
6048             log_error(LOG_LEVEL_FATAL,
6049                "can't bind to %s:%d: There may be another Privoxy "
6050                "or some other proxy running on port %d",
6051                bind_address, hport, hport);
6052             exit(-1);
6053
6054          case -2:
6055             log_error(LOG_LEVEL_FATAL,
6056                "can't bind to %s:%d: The hostname is not resolvable",
6057                bind_address, hport);
6058             exit(-1);
6059
6060          default:
6061             log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: %E",
6062                bind_address, hport);
6063             exit(-1);
6064       }
6065
6066       /* shouldn't get here */
6067       return JB_INVALID_SOCKET;
6068    }
6069
6070 #ifndef HAVE_POLL
6071 #ifndef _WIN32
6072    if (bfd >= FD_SETSIZE)
6073    {
6074       log_error(LOG_LEVEL_FATAL,
6075          "Bind socket number too high to use select(): %d >= %d",
6076          bfd, FD_SETSIZE);
6077    }
6078 #endif
6079 #endif
6080
6081    if (haddr == NULL)
6082    {
6083       log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
6084          hport);
6085    }
6086    else
6087    {
6088       log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
6089          hport, haddr);
6090    }
6091
6092    return bfd;
6093 }
6094
6095
6096 /*********************************************************************
6097  *
6098  * Function    :  bind_ports_helper
6099  *
6100  * Description :  Bind the listen ports.  Handles logging, and aborts
6101  *                on failure.
6102  *
6103  * Parameters  :
6104  *          1  :  config = Privoxy configuration.  Specifies ports
6105  *                         to bind to.
6106  *          2  :  sockets = Preallocated array of opened sockets
6107  *                          corresponding to specification in config.
6108  *                          All non-opened sockets will be set to
6109  *                          JB_INVALID_SOCKET.
6110  *
6111  * Returns     :  Nothing. Inspect sockets argument.
6112  *
6113  *********************************************************************/
6114 static void bind_ports_helper(struct configuration_spec * config,
6115                               jb_socket sockets[])
6116 {
6117    int i;
6118
6119    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
6120    {
6121       if (config->hport[i])
6122       {
6123          sockets[i] = bind_port_helper(config->haddr[i],
6124             config->hport[i], config->listen_backlog);
6125 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
6126          if (config->enable_accept_filter && sockets[i] != JB_INVALID_SOCKET)
6127          {
6128             struct accept_filter_arg af_options;
6129             bzero(&af_options, sizeof(af_options));
6130             strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
6131             if (setsockopt(sockets[i], SOL_SOCKET, SO_ACCEPTFILTER, &af_options,
6132                   sizeof(af_options)))
6133             {
6134                log_error(LOG_LEVEL_ERROR,
6135                   "Enabling accept filter for socket %d failed: %E", sockets[i]);
6136             }
6137          }
6138 #endif
6139       }
6140       else
6141       {
6142          sockets[i] = JB_INVALID_SOCKET;
6143       }
6144    }
6145    config->need_bind = 0;
6146 }
6147
6148
6149 /*********************************************************************
6150  *
6151  * Function    :  close_ports_helper
6152  *
6153  * Description :  Close listenings ports.
6154  *
6155  * Parameters  :
6156  *          1  :  sockets = Array of opened and non-opened sockets to
6157  *                          close. All sockets will be set to
6158  *                          JB_INVALID_SOCKET.
6159  *
6160  * Returns     :  Nothing.
6161  *
6162  *********************************************************************/
6163 static void close_ports_helper(jb_socket sockets[])
6164 {
6165    int i;
6166
6167    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
6168    {
6169       if (JB_INVALID_SOCKET != sockets[i])
6170       {
6171          close_socket(sockets[i]);
6172       }
6173       sockets[i] = JB_INVALID_SOCKET;
6174    }
6175 }
6176
6177
6178 #ifdef _WIN32
6179 /* Without this simple workaround we get this compiler warning from _beginthread
6180  *     warning C4028: formal parameter 1 different from declaration
6181  */
6182 void w32_service_listen_loop(void *p)
6183 {
6184    listen_loop();
6185 }
6186 #endif /* def _WIN32 */
6187
6188
6189 /*********************************************************************
6190  *
6191  * Function    :  listen_loop
6192  *
6193  * Description :  bind the listen port and enter a "FOREVER" listening loop.
6194  *
6195  * Parameters  :  N/A
6196  *
6197  * Returns     :  Never.
6198  *
6199  *********************************************************************/
6200 static void listen_loop(void)
6201 {
6202    struct client_states *csp_list = NULL;
6203    struct client_state *csp = NULL;
6204    jb_socket bfds[MAX_LISTENING_SOCKETS];
6205    struct configuration_spec *config;
6206    unsigned int active_threads = 0;
6207 #if defined(FEATURE_PTHREAD)
6208    pthread_attr_t attrs;
6209
6210    pthread_attr_init(&attrs);
6211    pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
6212 #endif
6213
6214    config = load_config();
6215
6216 #ifdef FEATURE_CONNECTION_SHARING
6217    /*
6218     * XXX: Should be relocated once it no
6219     * longer needs to emit log messages.
6220     */
6221    initialize_reusable_connections();
6222 #endif /* def FEATURE_CONNECTION_SHARING */
6223
6224    bind_ports_helper(config, bfds);
6225
6226 #ifdef FEATURE_GRACEFUL_TERMINATION
6227    while (!g_terminate)
6228 #else
6229    for (;;)
6230 #endif
6231    {
6232 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__)
6233       while (waitpid(-1, NULL, WNOHANG) > 0)
6234       {
6235          /* zombie children */
6236       }
6237 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) */
6238
6239       /*
6240        * Free data that was used by died threads
6241        */
6242       active_threads = sweep();
6243
6244 #if defined(unix)
6245       /*
6246        * Re-open the errlog after HUP signal
6247        */
6248       if (received_hup_signal)
6249       {
6250          if (NULL != config->logfile)
6251          {
6252             init_error_log(Argv[0], config->logfile);
6253          }
6254          received_hup_signal = 0;
6255       }
6256 #endif
6257
6258       csp_list = zalloc_or_die(sizeof(*csp_list));
6259       csp = &csp_list->csp;
6260
6261       log_error(LOG_LEVEL_CONNECT,
6262          "Waiting for the next client connection. Currently active threads: %u",
6263          active_threads);
6264
6265       /*
6266        * This config may be outdated, but for accept_connection()
6267        * it's fresh enough.
6268        */
6269       csp->config = config;
6270
6271       if (!accept_connection(csp, bfds))
6272       {
6273          log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
6274          freez(csp_list);
6275          continue;
6276       }
6277
6278       csp->flags |= CSP_FLAG_ACTIVE;
6279       csp->server_connection.sfd = JB_INVALID_SOCKET;
6280
6281       csp->config = config = load_config();
6282
6283       if (config->need_bind)
6284       {
6285          /*
6286           * Since we were listening to the "old port", we will not see
6287           * a "listen" param change until the next request.  So, at
6288           * least 1 more request must be made for us to find the new
6289           * setting.  I am simply closing the old socket and binding the
6290           * new one.
6291           *
6292           * Which-ever is correct, we will serve 1 more page via the
6293           * old settings.  This should probably be a "show-status"
6294           * request.  This should not be a so common of an operation
6295           * that this will hurt people's feelings.
6296           */
6297
6298          close_ports_helper(bfds);
6299
6300          bind_ports_helper(config, bfds);
6301       }
6302
6303 #ifdef FEATURE_TOGGLE
6304       if (global_toggle_state)
6305 #endif /* def FEATURE_TOGGLE */
6306       {
6307          csp->flags |= CSP_FLAG_TOGGLED_ON;
6308       }
6309
6310       if (run_loader(csp))
6311       {
6312          log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
6313          /* Never get here - LOG_LEVEL_FATAL causes program exit */
6314       }
6315
6316 #ifdef FEATURE_ACL
6317       if (block_acl(NULL,csp))
6318       {
6319          log_error(LOG_LEVEL_CONNECT,
6320             "Connection from %s on %s (socket %d) dropped due to ACL",
6321             csp->ip_addr_str, csp->listen_addr_str, csp->cfd);
6322          close_socket(csp->cfd);
6323          freez(csp->ip_addr_str);
6324          freez(csp->listen_addr_str);
6325          freez(csp_list);
6326          continue;
6327       }
6328 #endif /* def FEATURE_ACL */
6329
6330       if ((0 != config->max_client_connections)
6331          && (active_threads >= config->max_client_connections))
6332       {
6333          log_error(LOG_LEVEL_ERROR,
6334             "Rejecting connection from %s. Maximum number of connections reached.",
6335             csp->ip_addr_str);
6336          write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6337             strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6338          close_socket(csp->cfd);
6339          freez(csp->ip_addr_str);
6340          freez(csp->listen_addr_str);
6341          freez(csp_list);
6342          continue;
6343       }
6344
6345       /* add it to the list of clients */
6346       csp_list->next = clients->next;
6347       clients->next = csp_list;
6348
6349       if (config->multi_threaded)
6350       {
6351          int child_id;
6352
6353 /* this is a switch () statement in the C preprocessor - ugh */
6354 #undef SELECTED_ONE_OPTION
6355
6356 /* Use Pthreads in preference to native code */
6357 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
6358 #define SELECTED_ONE_OPTION
6359          {
6360             pthread_t the_thread;
6361             int ret;
6362
6363             ret = pthread_create(&the_thread, &attrs,
6364                (void * (*)(void *))serve, csp);
6365             child_id = ret ? -1 : 0;
6366          }
6367 #endif
6368
6369 #if defined(_WIN32) && !defined(SELECTED_ONE_OPTION)
6370 #define SELECTED_ONE_OPTION
6371          child_id = _beginthread(
6372             (void (*)(void *))serve,
6373             64 * 1024,
6374             csp);
6375 #endif
6376
6377 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
6378 #define SELECTED_ONE_OPTION
6379          {
6380             thread_id tid = spawn_thread
6381                (server_thread, "server", B_NORMAL_PRIORITY, csp);
6382
6383             if ((tid >= 0) && (resume_thread(tid) == B_OK))
6384             {
6385                child_id = (int) tid;
6386             }
6387             else
6388             {
6389                child_id = -1;
6390             }
6391          }
6392 #endif
6393
6394 #if !defined(SELECTED_ONE_OPTION)
6395          child_id = fork();
6396
6397          /* This block is only needed when using fork().
6398           * When using threads, the server thread was
6399           * created and run by the call to _beginthread().
6400           */
6401          if (child_id == 0)   /* child */
6402          {
6403             int rc = 0;
6404 #ifdef FEATURE_TOGGLE
6405             int inherited_toggle_state = global_toggle_state;
6406 #endif /* def FEATURE_TOGGLE */
6407
6408             serve(csp);
6409
6410             /*
6411              * If we've been toggled or we've blocked the request, tell Mom
6412              */
6413
6414 #ifdef FEATURE_TOGGLE
6415             if (inherited_toggle_state != global_toggle_state)
6416             {
6417                rc |= RC_FLAG_TOGGLED;
6418             }
6419 #endif /* def FEATURE_TOGGLE */
6420
6421 #ifdef FEATURE_STATISTICS
6422             if (csp->flags & CSP_FLAG_REJECTED)
6423             {
6424                rc |= RC_FLAG_BLOCKED;
6425             }
6426 #endif /* ndef FEATURE_STATISTICS */
6427
6428             _exit(rc);
6429          }
6430          else if (child_id > 0) /* parent */
6431          {
6432             /* in a fork()'d environment, the parent's
6433              * copy of the client socket and the CSP
6434              * are not used.
6435              */
6436             int child_status;
6437 #if !defined(_WIN32) && !defined(__CYGWIN__)
6438
6439             wait(&child_status);
6440
6441             /*
6442              * Evaluate child's return code: If the child has
6443              *  - been toggled, toggle ourselves
6444              *  - blocked its request, bump up the stats counter
6445              */
6446
6447 #ifdef FEATURE_TOGGLE
6448             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
6449             {
6450                global_toggle_state = !global_toggle_state;
6451             }
6452 #endif /* def FEATURE_TOGGLE */
6453
6454 #ifdef FEATURE_STATISTICS
6455             urls_read++;
6456             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
6457             {
6458                urls_rejected++;
6459             }
6460 #endif /* def FEATURE_STATISTICS */
6461
6462 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
6463             close_socket(csp->cfd);
6464             csp->flags &= ~CSP_FLAG_ACTIVE;
6465          }
6466 #endif
6467
6468 #undef SELECTED_ONE_OPTION
6469 /* end of cpp switch () */
6470
6471          if (child_id < 0)
6472          {
6473             /*
6474              * Spawning the child failed, assume it's because
6475              * there are too many children running already.
6476              * XXX: If you assume ...
6477              */
6478             log_error(LOG_LEVEL_ERROR,
6479                "Unable to take any additional connections: %E. Active threads: %u",
6480                active_threads);
6481             write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6482                strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6483             close_socket(csp->cfd);
6484             csp->flags &= ~CSP_FLAG_ACTIVE;
6485          }
6486       }
6487       else
6488       {
6489          serve(csp);
6490       }
6491    }
6492
6493 #if defined(FEATURE_PTHREAD)
6494    pthread_attr_destroy(&attrs);
6495 #endif
6496
6497    /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
6498
6499 #ifdef FEATURE_GRACEFUL_TERMINATION
6500
6501    log_error(LOG_LEVEL_INFO, "Graceful termination requested.");
6502
6503    close_ports_helper(bfds);
6504
6505    unload_current_config_file();
6506    unload_current_actions_file();
6507    unload_current_re_filterfile();
6508 #ifdef FEATURE_TRUST
6509    unload_current_trust_file();
6510 #endif
6511
6512    if (config->multi_threaded)
6513    {
6514       int i = 60;
6515       do
6516       {
6517          sleep(1);
6518          sweep();
6519       } while ((clients->next != NULL) && (--i > 0));
6520
6521       if (i <= 0)
6522       {
6523          log_error(LOG_LEVEL_ERROR, "Graceful termination failed "
6524             "- still some live clients after 1 minute wait.");
6525       }
6526    }
6527    sweep();
6528    sweep();
6529
6530 #if defined(unix)
6531    freez(basedir);
6532 #endif
6533
6534 #ifdef FEATURE_HTTPS_INSPECTION
6535    /*
6536     * Only release TLS backed resources if there
6537     * are no active connections left.
6538     */
6539    if (clients->next == NULL)
6540    {
6541       ssl_release();
6542    }
6543 #endif
6544
6545    log_error(LOG_LEVEL_INFO, "Exiting gracefully.");
6546
6547 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
6548    /* Cleanup - remove taskbar icon etc. */
6549    TermLogWindow();
6550 #endif
6551
6552    exit(0);
6553 #endif /* FEATURE_GRACEFUL_TERMINATION */
6554
6555 }
6556
6557
6558 /*
6559   Local Variables:
6560   tab-width: 3
6561   end:
6562 */