prepare_csp_for_next_request(): Fix format specifiers in a log message
[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) 2001-2020 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 #endif /* def FEATURE_STATISTICS */
131
132 #ifdef FEATURE_GRACEFUL_TERMINATION
133 int g_terminate = 0;
134 #endif
135
136 #if !defined(_WIN32)
137 static void sig_handler(int the_signal);
138 #endif
139 static int client_protocol_is_unsupported(struct client_state *csp, char *req);
140 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
141 static jb_err get_server_headers(struct client_state *csp);
142 static const char *crunch_reason(const struct http_response *rsp);
143 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
144 static char *get_request_line(struct client_state *csp);
145 static jb_err receive_client_request(struct client_state *csp);
146 static jb_err parse_client_request(struct client_state *csp);
147 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
148 static jb_err change_request_destination(struct client_state *csp);
149 static void handle_established_connection(struct client_state *csp);
150 static void chat(struct client_state *csp);
151 static void serve(struct client_state *csp);
152 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
153 static void usage(const char *myname);
154 #endif
155 static void initialize_mutexes(void);
156 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog);
157 static void bind_ports_helper(struct configuration_spec *config, jb_socket sockets[]);
158 static void close_ports_helper(jb_socket sockets[]);
159 static void listen_loop(void);
160 static void serve(struct client_state *csp);
161
162 #ifdef __BEOS__
163 static int32 server_thread(void *data);
164 #endif /* def __BEOS__ */
165
166 #ifdef _WIN32
167 #define sleep(N)  Sleep(((N) * 1000))
168 #endif
169
170 #ifdef FUZZ
171 int process_fuzzed_input(char *fuzz_input_type, char *fuzz_input_file);
172 void show_fuzz_usage(const char *name);
173 #endif
174
175 #ifdef MUTEX_LOCKS_AVAILABLE
176 /*
177  * XXX: Does the locking stuff really belong in this file?
178  */
179 privoxy_mutex_t log_mutex;
180 privoxy_mutex_t log_init_mutex;
181 privoxy_mutex_t connection_reuse_mutex;
182
183 #ifdef FEATURE_HTTPS_INSPECTION
184 privoxy_mutex_t certificate_mutex;
185 privoxy_mutex_t ssl_init_mutex;
186 #endif
187
188 #ifdef FEATURE_EXTERNAL_FILTERS
189 privoxy_mutex_t external_filter_mutex;
190 #endif
191 #ifdef FEATURE_CLIENT_TAGS
192 privoxy_mutex_t client_tags_mutex;
193 #endif
194 #ifdef FEATURE_EXTENDED_STATISTICS
195 privoxy_mutex_t filter_statistics_mutex;
196 privoxy_mutex_t block_statistics_mutex;
197 #endif
198
199 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
200 privoxy_mutex_t resolver_mutex;
201 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
202
203 #ifndef HAVE_GMTIME_R
204 privoxy_mutex_t gmtime_mutex;
205 #endif /* ndef HAVE_GMTIME_R */
206
207 #ifndef HAVE_LOCALTIME_R
208 privoxy_mutex_t localtime_mutex;
209 #endif /* ndef HAVE_GMTIME_R */
210
211 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
212 privoxy_mutex_t rand_mutex;
213 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
214
215 #endif /* def MUTEX_LOCKS_AVAILABLE */
216
217 #if defined(unix)
218 const char *basedir = NULL;
219 const char *pidfile = NULL;
220 static int received_hup_signal = 0;
221 #endif /* defined unix */
222
223 /* HTTP snipplets. */
224 static const char CSUCCEED[] =
225    "HTTP/1.1 200 Connection established\r\n\r\n";
226
227 static const char CHEADER[] =
228    "HTTP/1.1 400 Invalid header received from client\r\n"
229    "Content-Type: text/plain\r\n"
230    "Connection: close\r\n\r\n"
231    "Invalid header received from client.\r\n";
232
233 static const char FTP_RESPONSE[] =
234    "HTTP/1.1 400 Invalid request received from client\r\n"
235    "Content-Type: text/plain\r\n"
236    "Connection: close\r\n\r\n"
237    "Invalid request. Privoxy doesn't support FTP.\r\n";
238
239 static const char GOPHER_RESPONSE[] =
240    "HTTP/1.1 400 Invalid request received from client\r\n"
241    "Content-Type: text/plain\r\n"
242    "Connection: close\r\n\r\n"
243    "Invalid request. Privoxy doesn't support gopher.\r\n";
244
245 /* XXX: should be a template */
246 static const char MISSING_DESTINATION_RESPONSE[] =
247    "HTTP/1.1 400 Bad request received from client\r\n"
248    "Content-Type: text/plain\r\n"
249    "Connection: close\r\n\r\n"
250    "Bad request. Privoxy was unable to extract the destination.\r\n";
251
252 /* XXX: should be a template */
253 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
254    "HTTP/1.1 502 Server or forwarder response invalid\r\n"
255    "Content-Type: text/plain\r\n"
256    "Connection: close\r\n\r\n"
257    "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
258
259 /* XXX: should be a template */
260 static const char MESSED_UP_REQUEST_RESPONSE[] =
261    "HTTP/1.1 400 Malformed request after rewriting\r\n"
262    "Content-Type: text/plain\r\n"
263    "Connection: close\r\n\r\n"
264    "Bad request. Messed up with header filters.\r\n";
265
266 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
267    "HTTP/1.1 503 Too many open connections\r\n"
268    "Content-Type: text/plain\r\n"
269    "Connection: close\r\n\r\n"
270    "Maximum number of open connections reached.\r\n";
271
272 static const char CLIENT_CONNECTION_TIMEOUT_RESPONSE[] =
273    "HTTP/1.1 504 Connection timeout\r\n"
274    "Content-Type: text/plain\r\n"
275    "Connection: close\r\n\r\n"
276    "The connection timed out because the client request didn't arrive in time.\r\n";
277
278 static const char CLIENT_BODY_PARSE_ERROR_RESPONSE[] =
279    "HTTP/1.1 400 Failed reading client body\r\n"
280    "Content-Type: text/plain\r\n"
281    "Connection: close\r\n\r\n"
282    "Failed parsing or buffering the chunk-encoded client body.\r\n";
283
284 static const char UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE[] =
285    "HTTP/1.1 417 Expecting too much\r\n"
286    "Content-Type: text/plain\r\n"
287    "Connection: close\r\n\r\n"
288    "Privoxy detected an unsupported Expect header value.\r\n";
289
290 /* A function to crunch a response */
291 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
292
293 /* Crunch function flags */
294 #define CF_NO_FLAGS        0
295 /* Cruncher applies to forced requests as well */
296 #define CF_IGNORE_FORCE    1
297 /* Crunched requests are counted for the block statistics */
298 #define CF_COUNT_AS_REJECT 2
299
300 /* A crunch function and its flags */
301 struct cruncher
302 {
303    const crunch_func_ptr cruncher;
304    const int flags;
305 };
306
307 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
308
309 /* Complete list of cruncher functions */
310 static const struct cruncher crunchers_all[] = {
311    { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
312    { block_url,       CF_COUNT_AS_REJECT },
313 #ifdef FEATURE_TRUST
314    { trust_url,       CF_COUNT_AS_REJECT },
315 #endif /* def FEATURE_TRUST */
316    { redirect_url,    CF_NO_FLAGS  },
317    { dispatch_cgi,    CF_IGNORE_FORCE},
318    { NULL,            0 }
319 };
320
321 /* Light version, used after tags are applied */
322 static const struct cruncher crunchers_light[] = {
323    { block_url,       CF_COUNT_AS_REJECT },
324    { redirect_url,    CF_NO_FLAGS },
325    { NULL,            0 }
326 };
327
328
329 /*
330  * XXX: Don't we really mean
331  *
332  * #if defined(unix)
333  *
334  * here?
335  */
336 #if !defined(_WIN32)
337 /*********************************************************************
338  *
339  * Function    :  sig_handler
340  *
341  * Description :  Signal handler for different signals.
342  *                Exit gracefully on TERM and INT
343  *                or set a flag that will cause the errlog
344  *                to be reopened by the main thread on HUP.
345  *
346  * Parameters  :
347  *          1  :  the_signal = the signal cause this function to call
348  *
349  * Returns     :  -
350  *
351  *********************************************************************/
352 static void sig_handler(int the_signal)
353 {
354    switch(the_signal)
355    {
356       case SIGTERM:
357       case SIGINT:
358          log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
359 #if defined(unix)
360          if (pidfile)
361          {
362             unlink(pidfile);
363          }
364 #endif /* unix */
365          exit(the_signal);
366          break;
367
368       case SIGHUP:
369 #if defined(unix)
370          received_hup_signal = 1;
371 #endif
372          break;
373
374       default:
375          /*
376           * We shouldn't be here, unless we catch signals
377           * in main() that we can't handle here!
378           */
379          log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
380    }
381    return;
382
383 }
384 #endif
385
386
387 /*********************************************************************
388  *
389  * Function    :  get_write_delay
390  *
391  * Description :  Parse the delay-response parameter.
392  *
393  * Parameters  :
394  *          1  :  csp = Current client state (buffers, headers, etc...)
395  *
396  * Returns     :  Number of milliseconds to delay writes.
397  *
398  *********************************************************************/
399 static unsigned int get_write_delay(const struct client_state *csp)
400 {
401    unsigned int delay;
402    char *endptr;
403    char *newval;
404
405    if ((csp->action->flags & ACTION_DELAY_RESPONSE) == 0)
406    {
407       return 0;
408    }
409    newval = csp->action->string[ACTION_STRING_DELAY_RESPONSE];
410
411    delay = (unsigned)strtol(newval, &endptr, 0);
412    if (*endptr != '\0')
413    {
414       log_error(LOG_LEVEL_FATAL,
415          "Invalid delay-response{} parameter: '%s'", newval);
416    }
417
418    return delay;
419
420 }
421
422
423 /*********************************************************************
424  *
425  * Function    :  client_protocol_is_unsupported
426  *
427  * Description :  Checks if the client used a known unsupported
428  *                protocol and deals with it by sending an error
429  *                response.
430  *
431  * Parameters  :
432  *          1  :  csp = Current client state (buffers, headers, etc...)
433  *          2  :  req = the first request line send by the client
434  *
435  * Returns     :  TRUE if an error response has been generated, or
436  *                FALSE if the request doesn't look invalid.
437  *
438  *********************************************************************/
439 static int client_protocol_is_unsupported(struct client_state *csp, char *req)
440 {
441    /*
442     * If it's a FTP or gopher request, we don't support it.
443     *
444     * These checks are better than nothing, but they might
445     * not work in all configurations and some clients might
446     * have problems digesting the answer.
447     *
448     * They should, however, never cause more problems than
449     * Privoxy's old behaviour (returning the misleading HTML
450     * error message:
451     *
452     * "Could not resolve http://(ftp|gopher)://example.org").
453     */
454    if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
455    {
456       const char *response = NULL;
457       const char *protocol = NULL;
458
459       if (!strncmpic(req, "GET ftp://", 10))
460       {
461          response = FTP_RESPONSE;
462          protocol = "FTP";
463       }
464       else
465       {
466          response = GOPHER_RESPONSE;
467          protocol = "GOPHER";
468       }
469       log_error(LOG_LEVEL_ERROR,
470          "%s tried to use Privoxy as %s proxy: %s",
471          csp->ip_addr_str, protocol, req);
472       log_error(LOG_LEVEL_CLF,
473          "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
474       freez(req);
475
476 #ifdef FEATURE_HTTPS_INSPECTION
477       if (client_use_ssl(csp))
478       {
479          ssl_send_data_delayed(&(csp->ssl_client_attr),
480             (const unsigned char *)response, strlen(response),
481             get_write_delay(csp));
482       }
483       else
484 #endif
485       {
486          write_socket_delayed(csp->cfd, response, strlen(response),
487             get_write_delay(csp));
488       }
489
490       return TRUE;
491    }
492
493    return FALSE;
494 }
495
496
497 /*********************************************************************
498  *
499  * Function    :  client_has_unsupported_expectations
500  *
501  * Description :  Checks if the client used an unsupported expectation
502  *                in which case an error message is delivered.
503  *
504  * Parameters  :
505  *          1  :  csp = Current client state (buffers, headers, etc...)
506  *
507  * Returns     :  TRUE if an error response has been generated, or
508  *                FALSE if the request doesn't look invalid.
509  *
510  *********************************************************************/
511 static int client_has_unsupported_expectations(const struct client_state *csp)
512 {
513    if ((csp->flags & CSP_FLAG_UNSUPPORTED_CLIENT_EXPECTATION))
514    {
515       log_error(LOG_LEVEL_ERROR,
516          "Rejecting request from client %s with unsupported Expect header value",
517          csp->ip_addr_str);
518       log_error(LOG_LEVEL_CLF,
519          "%s - - [%T] \"%s\" 417 0", csp->ip_addr_str, csp->http->cmd);
520       write_socket_delayed(csp->cfd,
521          UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE,
522          strlen(UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE),
523          get_write_delay(csp));
524
525       return TRUE;
526    }
527
528    return FALSE;
529
530 }
531
532
533 /*********************************************************************
534  *
535  * Function    :  get_request_destination_elsewhere
536  *
537  * Description :  If the client's request was redirected into
538  *                Privoxy without the client's knowledge,
539  *                the request line lacks the destination host.
540  *
541  *                This function tries to get it elsewhere,
542  *                provided accept-intercepted-requests is enabled.
543  *
544  *                "Elsewhere" currently only means "Host: header",
545  *                but in the future we may ask the redirecting
546  *                packet filter to look the destination up.
547  *
548  *                If the destination stays unknown, an error
549  *                response is send to the client and headers
550  *                are freed so that chat() can return directly.
551  *
552  * Parameters  :
553  *          1  :  csp = Current client state (buffers, headers, etc...)
554  *          2  :  headers = a header list
555  *
556  * Returns     :  JB_ERR_OK if the destination is now known, or
557  *                JB_ERR_PARSE if it isn't.
558  *
559  *********************************************************************/
560 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
561 {
562    char *req;
563
564    if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
565    {
566       log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
567          " Privoxy isn't configured to accept intercepted requests.",
568          csp->ip_addr_str, csp->http->cmd);
569       /* XXX: Use correct size */
570       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
571          csp->ip_addr_str, csp->http->cmd);
572
573       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
574          get_write_delay(csp));
575       destroy_list(headers);
576
577       return JB_ERR_PARSE;
578    }
579    else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
580    {
581       /* Split the domain we just got for pattern matching */
582       init_domain_components(csp->http);
583
584       return JB_ERR_OK;
585    }
586    else
587    {
588       /* We can't work without destination. Go spread the news.*/
589
590       req = list_to_text(headers);
591       chomp(req);
592       /* XXX: Use correct size */
593       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
594          csp->ip_addr_str, csp->http->cmd);
595       log_error(LOG_LEVEL_ERROR,
596          "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
597          csp->ip_addr_str, csp->http->cmd, req);
598       freez(req);
599
600       write_socket_delayed(csp->cfd, MISSING_DESTINATION_RESPONSE,
601          strlen(MISSING_DESTINATION_RESPONSE), get_write_delay(csp));
602       destroy_list(headers);
603
604       return JB_ERR_PARSE;
605    }
606    /*
607     * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
608     * to get the destination IP address, use it as host directly
609     * or do a reverse DNS lookup first.
610     */
611 }
612
613
614 /*********************************************************************
615  *
616  * Function    :  get_server_headers
617  *
618  * Description :  Parses server headers in iob and fills them
619  *                into csp->headers so that they can later be
620  *                handled by sed().
621  *
622  * Parameters  :
623  *          1  :  csp = Current client state (buffers, headers, etc...)
624  *
625  * Returns     :  JB_ERR_OK if everything went fine, or
626  *                JB_ERR_PARSE if the headers were incomplete.
627  *
628  *********************************************************************/
629 static jb_err get_server_headers(struct client_state *csp)
630 {
631    int continue_hack_in_da_house = 0;
632    char * header;
633
634    while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
635    {
636       if (header == NULL)
637       {
638          /*
639           * continue hack in da house. Ignore the ending of
640           * this head and continue enlisting header lines.
641           * The reason is described below.
642           */
643          enlist(csp->headers, "");
644          continue_hack_in_da_house = 0;
645          continue;
646       }
647       else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
648       {
649          /*
650           * It's a bodyless continue response, don't
651           * stop header parsing after reaching its end.
652           *
653           * As a result Privoxy will concatenate the
654           * next response's head and parse and deliver
655           * the headers as if they belonged to one request.
656           *
657           * The client will separate them because of the
658           * empty line between them.
659           *
660           * XXX: What we're doing here is clearly against
661           * the intended purpose of the continue header,
662           * and under some conditions (HTTP/1.0 client request)
663           * it's a standard violation.
664           *
665           * Anyway, "sort of against the spec" is preferable
666           * to "always getting confused by Continue responses"
667           * (Privoxy's behaviour before this hack was added)
668           */
669          log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
670          continue_hack_in_da_house = 1;
671       }
672       else if (*header == '\0')
673       {
674          /*
675           * If the header is empty, but the Continue hack
676           * isn't active, we can assume that we reached the
677           * end of the buffer before we hit the end of the
678           * head.
679           *
680           * Inform the caller an let it decide how to handle it.
681           */
682          return JB_ERR_PARSE;
683       }
684
685       if (JB_ERR_MEMORY == enlist(csp->headers, header))
686       {
687          /*
688           * XXX: Should we quit the request and return a
689           * out of memory error page instead?
690           */
691          log_error(LOG_LEVEL_ERROR,
692             "Out of memory while enlisting server headers. %s lost.",
693             header);
694       }
695       freez(header);
696    }
697
698    return JB_ERR_OK;
699 }
700
701
702 /*********************************************************************
703  *
704  * Function    :  crunch_reason
705  *
706  * Description :  Translates the crunch reason code into a string.
707  *
708  * Parameters  :
709  *          1  :  rsp = a http_response
710  *
711  * Returns     :  A string with the crunch reason or an error description.
712  *
713  *********************************************************************/
714 static const char *crunch_reason(const struct http_response *rsp)
715 {
716    char * reason = NULL;
717
718    assert(rsp != NULL);
719    if (rsp == NULL)
720    {
721       return "Internal error while searching for crunch reason";
722    }
723
724    switch (rsp->crunch_reason)
725    {
726       case UNSUPPORTED:
727          reason = "Unsupported HTTP feature";
728          break;
729       case BLOCKED:
730          reason = "Blocked";
731          break;
732       case UNTRUSTED:
733          reason = "Untrusted";
734          break;
735       case REDIRECTED:
736          reason = "Redirected";
737          break;
738       case CGI_CALL:
739          reason = "CGI Call";
740          break;
741       case NO_SUCH_DOMAIN:
742          reason = "DNS failure";
743          break;
744       case FORWARDING_FAILED:
745          reason = "Forwarding failed";
746          break;
747       case CONNECT_FAILED:
748          reason = "Connection failure";
749          break;
750       case OUT_OF_MEMORY:
751          reason = "Out of memory (may mask other reasons)";
752          break;
753       case CONNECTION_TIMEOUT:
754          reason = "Connection timeout";
755          break;
756       case NO_SERVER_DATA:
757          reason = "No server data received";
758          break;
759       default:
760          reason = "No reason recorded";
761          break;
762    }
763
764    return reason;
765 }
766
767
768 /*********************************************************************
769  *
770  * Function    :  log_applied_actions
771  *
772  * Description :  Logs the applied actions if LOG_LEVEL_ACTIONS is
773  *                enabled.
774  *
775  * Parameters  :
776  *          1  :  actions = Current action spec to log
777  *
778  * Returns     :  Nothing.
779  *
780  *********************************************************************/
781 static void log_applied_actions(const struct current_action_spec *actions)
782 {
783    /*
784     * The conversion to text requires lots of memory allocations so
785     * we only do the conversion if the user is actually interested.
786     */
787    if (debug_level_is_enabled(LOG_LEVEL_ACTIONS))
788    {
789       char *actions_as_text = actions_to_line_of_text(actions);
790       log_error(LOG_LEVEL_ACTIONS, "%s", actions_as_text);
791       freez(actions_as_text);
792    }
793 }
794
795
796 /*********************************************************************
797  *
798  * Function    :  send_crunch_response
799  *
800  * Description :  Delivers already prepared response for
801  *                intercepted requests, logs the interception
802  *                and frees the response.
803  *
804  * Parameters  :
805  *          1  :  csp = Current client state (buffers, headers, etc...)
806  *          2  :  rsp = Fully prepared response. Will be freed on exit.
807  *
808  * Returns     :  Nothing.
809  *
810  *********************************************************************/
811 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
812 {
813       const struct http_request *http = csp->http;
814       char status_code[4];
815
816       assert(rsp != NULL);
817       assert(rsp->head != NULL);
818
819       if (rsp == NULL)
820       {
821          log_error(LOG_LEVEL_FATAL, "NULL response in send_crunch_response.");
822       }
823
824       /*
825        * Extract the status code from the actual head
826        * that will be send to the client. It is the only
827        * way to get it right for all requests, including
828        * the fixed ones for out-of-memory problems.
829        *
830        * A head starts like this: 'HTTP/1.1 200...'
831        *                           0123456789|11
832        *                                     10
833        */
834       status_code[0] = rsp->head[9];
835       status_code[1] = rsp->head[10];
836       status_code[2] = rsp->head[11];
837       status_code[3] = '\0';
838
839       /* Log that the request was crunched and why. */
840       log_applied_actions(csp->action);
841 #ifdef FEATURE_HTTPS_INSPECTION
842       if (client_use_ssl(csp))
843       {
844          log_error(LOG_LEVEL_CRUNCH, "%s: https://%s%s", crunch_reason(rsp),
845             http->hostport, http->path);
846          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" %s %lu",
847             csp->ip_addr_str, http->gpc, http->hostport, http->path,
848             http->version, status_code, rsp->content_length);
849       }
850       else
851 #endif
852       {
853          log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
854          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %lu",
855             csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
856       }
857       /* Write the answer to the client */
858 #ifdef FEATURE_HTTPS_INSPECTION
859       if (client_use_ssl(csp))
860       {
861          if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
862                 (const unsigned char *)rsp->head, rsp->head_length,
863                 get_write_delay(csp)) < 0)
864           || (ssl_send_data_delayed(&(csp->ssl_client_attr),
865                 (const unsigned char *)rsp->body, rsp->content_length,
866                 get_write_delay(csp)) < 0))
867          {
868             /* There is nothing we can do about it. */
869             log_error(LOG_LEVEL_CONNECT, "Couldn't deliver the error message "
870                "for https://%s%s through client socket %d using TLS/SSL",
871                http->hostport, http->url, csp->cfd);
872          }
873       }
874       else
875 #endif
876       {
877          if (write_socket_delayed(csp->cfd, rsp->head, rsp->head_length,
878                 get_write_delay(csp))
879           || write_socket_delayed(csp->cfd, rsp->body, rsp->content_length,
880                 get_write_delay(csp)))
881          {
882             /* There is nothing we can do about it. */
883             log_error(LOG_LEVEL_CONNECT,
884                "Couldn't deliver the error message for %s through client socket %d: %E",
885                http->url, csp->cfd);
886          }
887       }
888
889       /* Clean up and return */
890       if (cgi_error_memory() != rsp)
891       {
892          free_http_response(rsp);
893       }
894       return;
895 }
896
897
898 /*********************************************************************
899  *
900  * Function    :  crunch_response_triggered
901  *
902  * Description :  Checks if the request has to be crunched,
903  *                and delivers the crunch response if necessary.
904  *
905  * Parameters  :
906  *          1  :  csp = Current client state (buffers, headers, etc...)
907  *          2  :  crunchers = list of cruncher functions to run
908  *
909  * Returns     :  TRUE if the request was answered with a crunch response
910  *                FALSE otherwise.
911  *
912  *********************************************************************/
913 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
914 {
915    struct http_response *rsp = NULL;
916    const struct cruncher *c;
917
918    /*
919     * If CGI request crunching is disabled,
920     * check the CGI dispatcher out of order to
921     * prevent unintentional blocks or redirects.
922     */
923    if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
924        && (NULL != (rsp = dispatch_cgi(csp))))
925    {
926       /* Deliver, log and free the interception response. */
927       send_crunch_response(csp, rsp);
928       csp->flags |= CSP_FLAG_CRUNCHED;
929       return TRUE;
930    }
931
932    for (c = crunchers; c->cruncher != NULL; c++)
933    {
934       /*
935        * Check the cruncher if either Privoxy is toggled
936        * on and the request isn't forced, or if the cruncher
937        * applies to forced requests as well.
938        */
939       if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
940           !(csp->flags & CSP_FLAG_FORCED)) ||
941           (c->flags & CF_IGNORE_FORCE))
942       {
943          rsp = c->cruncher(csp);
944          if (NULL != rsp)
945          {
946             /* Deliver, log and free the interception response. */
947             send_crunch_response(csp, rsp);
948             csp->flags |= CSP_FLAG_CRUNCHED;
949 #ifdef FEATURE_STATISTICS
950             if (c->flags & CF_COUNT_AS_REJECT)
951             {
952                csp->flags |= CSP_FLAG_REJECTED;
953             }
954 #endif /* def FEATURE_STATISTICS */
955
956             return TRUE;
957          }
958       }
959    }
960
961    return FALSE;
962 }
963
964
965 /*********************************************************************
966  *
967  * Function    :  build_request_line
968  *
969  * Description :  Builds the HTTP request line.
970  *
971  *                If a HTTP forwarder is used it expects the whole URL,
972  *                web servers only get the path.
973  *
974  * Parameters  :
975  *          1  :  csp = Current client state (buffers, headers, etc...)
976  *          2  :  fwd = The forwarding spec used for the request
977  *                XXX: Should use http->fwd instead.
978  *          3  :  request_line = The old request line which will be replaced.
979  *
980  * Returns     :  Nothing. Terminates in case of memory problems.
981  *
982  *********************************************************************/
983 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
984 {
985    struct http_request *http = csp->http;
986
987    /*
988     * Downgrade http version from 1.1 to 1.0
989     * if +downgrade action applies.
990     */
991    if ((csp->action->flags & ACTION_DOWNGRADE)
992      && (!strcmpic(http->version, "HTTP/1.1")))
993    {
994       freez(http->version);
995       http->version = strdup_or_die("HTTP/1.0");
996    }
997
998    /*
999     * Rebuild the request line.
1000     */
1001    freez(*request_line);
1002    *request_line = strdup(http->gpc);
1003    string_append(request_line, " ");
1004
1005    if (fwd->forward_host && fwd->type != FORWARD_WEBSERVER)
1006    {
1007       string_append(request_line, http->url);
1008    }
1009    else
1010    {
1011       string_append(request_line, http->path);
1012    }
1013    string_append(request_line, " ");
1014    string_append(request_line, http->version);
1015
1016    if (*request_line == NULL)
1017    {
1018       log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1019    }
1020    log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1021 }
1022
1023
1024 /*********************************************************************
1025  *
1026  * Function    :  change_request_destination
1027  *
1028  * Description :  Parse a (rewritten) request line and regenerate
1029  *                the http request data.
1030  *
1031  * Parameters  :
1032  *          1  :  csp = Current client state (buffers, headers, etc...)
1033  *
1034  * Returns     :  Forwards the parse_http_request() return code.
1035  *                Terminates in case of memory problems.
1036  *
1037  *********************************************************************/
1038 static jb_err change_request_destination(struct client_state *csp)
1039 {
1040    struct http_request *http = csp->http;
1041    jb_err err;
1042
1043    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
1044       csp->headers->first->str);
1045    free_http_request(http);
1046    err = parse_http_request(csp->headers->first->str, http);
1047    if (JB_ERR_OK != err)
1048    {
1049       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1050          jb_err_to_string(err));
1051    }
1052
1053    return err;
1054 }
1055
1056
1057 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1058 /*********************************************************************
1059  *
1060  * Function    :  server_response_is_complete
1061  *
1062  * Description :  Determines whether we should stop reading
1063  *                from the server socket.
1064  *
1065  * Parameters  :
1066  *          1  :  csp = Current client state (buffers, headers, etc...)
1067  *          2  :  content_length = Length of content received so far.
1068  *
1069  * Returns     :  TRUE if the response is complete,
1070  *                FALSE otherwise.
1071  *
1072  *********************************************************************/
1073 static int server_response_is_complete(struct client_state *csp,
1074    unsigned long long content_length)
1075 {
1076    int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1077
1078    if (!strcmpic(csp->http->gpc, "HEAD"))
1079    {
1080       /*
1081        * "HEAD" implies no body, we are thus expecting
1082        * no content. XXX: incomplete "list" of methods?
1083        */
1084       csp->expected_content_length = 0;
1085       content_length_known = TRUE;
1086       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1087    }
1088
1089    if (csp->http->status == 204 || csp->http->status == 304)
1090    {
1091       /*
1092        * Expect no body. XXX: incomplete "list" of status codes?
1093        */
1094       csp->expected_content_length = 0;
1095       content_length_known = TRUE;
1096       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1097    }
1098
1099    return (content_length_known && ((0 == csp->expected_content_length)
1100             || (csp->expected_content_length <= content_length)));
1101 }
1102
1103
1104 #ifdef FEATURE_CONNECTION_SHARING
1105 /*********************************************************************
1106  *
1107  * Function    :  wait_for_alive_connections
1108  *
1109  * Description :  Waits for alive connections to timeout.
1110  *
1111  * Parameters  :  N/A
1112  *
1113  * Returns     :  N/A
1114  *
1115  *********************************************************************/
1116 static void wait_for_alive_connections(void)
1117 {
1118    int connections_alive = close_unusable_connections();
1119
1120    while (0 < connections_alive)
1121    {
1122       log_error(LOG_LEVEL_CONNECT,
1123          "Waiting for %d connections to timeout.",
1124          connections_alive);
1125       sleep(60);
1126       connections_alive = close_unusable_connections();
1127    }
1128
1129    log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1130
1131 }
1132 #endif /* def FEATURE_CONNECTION_SHARING */
1133
1134
1135 /*********************************************************************
1136  *
1137  * Function    :  save_connection_destination
1138  *
1139  * Description :  Remembers a connection for reuse later on.
1140  *
1141  * Parameters  :
1142  *          1  :  sfd  = Open socket to remember.
1143  *          2  :  http = The destination for the connection.
1144  *          3  :  fwd  = The forwarder settings used.
1145  *          4  :  server_connection  = storage.
1146  *
1147  * Returns     : void
1148  *
1149  *********************************************************************/
1150 void save_connection_destination(jb_socket sfd,
1151                                  const struct http_request *http,
1152                                  const struct forward_spec *fwd,
1153                                  struct reusable_connection *server_connection)
1154 {
1155    assert(sfd != JB_INVALID_SOCKET);
1156    assert(NULL != http->host);
1157
1158    server_connection->sfd = sfd;
1159    server_connection->host = strdup_or_die(http->host);
1160    server_connection->port = http->port;
1161
1162    assert(NULL != fwd);
1163    assert(server_connection->gateway_host == NULL);
1164    assert(server_connection->gateway_port == 0);
1165    assert(server_connection->forwarder_type == 0);
1166    assert(server_connection->forward_host == NULL);
1167    assert(server_connection->forward_port == 0);
1168
1169    server_connection->forwarder_type = fwd->type;
1170    if (NULL != fwd->gateway_host)
1171    {
1172       server_connection->gateway_host = strdup_or_die(fwd->gateway_host);
1173    }
1174    else
1175    {
1176       server_connection->gateway_host = NULL;
1177    }
1178    server_connection->gateway_port = fwd->gateway_port;
1179
1180    if (NULL != fwd->forward_host)
1181    {
1182       server_connection->forward_host = strdup_or_die(fwd->forward_host);
1183    }
1184    else
1185    {
1186       server_connection->forward_host = NULL;
1187    }
1188    server_connection->forward_port = fwd->forward_port;
1189 }
1190 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1191
1192
1193 /*********************************************************************
1194  *
1195  * Function    : verify_request_length
1196  *
1197  * Description : Checks if we already got the whole client requests
1198  *               and sets CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ if
1199  *               we do.
1200  *
1201  *               Data that doesn't belong to the current request is
1202  *               either thrown away to let the client retry on a clean
1203  *               socket, or stashed to be dealt with after the current
1204  *               request is served.
1205  *
1206  * Parameters  :
1207  *          1  :  csp = Current client state (buffers, headers, etc...)
1208  *
1209  * Returns     :  void
1210  *
1211  *********************************************************************/
1212 static void verify_request_length(struct client_state *csp)
1213 {
1214    unsigned long long buffered_request_bytes =
1215       (unsigned long long)(csp->client_iob->eod - csp->client_iob->cur);
1216
1217    if ((csp->expected_client_content_length != 0)
1218       && (buffered_request_bytes != 0))
1219    {
1220       if (csp->expected_client_content_length >= buffered_request_bytes)
1221       {
1222          csp->expected_client_content_length -= buffered_request_bytes;
1223          log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
1224             "to account for the %llu ones we already got.",
1225             csp->expected_client_content_length, buffered_request_bytes);
1226       }
1227       else
1228       {
1229          assert(csp->client_iob->eod > csp->client_iob->cur + csp->expected_client_content_length);
1230          csp->client_iob->eod = csp->client_iob->cur + csp->expected_client_content_length;
1231          log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
1232             "Marking the server socket tainted after throwing %llu bytes away.",
1233             buffered_request_bytes - csp->expected_client_content_length);
1234          csp->expected_client_content_length = 0;
1235          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1236       }
1237
1238       if (csp->expected_client_content_length == 0)
1239       {
1240          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1241       }
1242    }
1243
1244    if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
1245       && ((csp->client_iob->cur < csp->client_iob->eod)
1246          || (csp->expected_client_content_length != 0)))
1247    {
1248       if (strcmpic(csp->http->gpc, "GET")
1249          && strcmpic(csp->http->gpc, "HEAD")
1250          && strcmpic(csp->http->gpc, "TRACE")
1251          && strcmpic(csp->http->gpc, "OPTIONS")
1252          && strcmpic(csp->http->gpc, "DELETE"))
1253       {
1254          /* XXX: this is an incomplete hack */
1255          csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1256          log_error(LOG_LEVEL_CONNECT, "There better be a request body.");
1257       }
1258       else
1259       {
1260          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1261
1262          if ((csp->config->feature_flags & RUNTIME_FEATURE_TOLERATE_PIPELINING) == 0)
1263          {
1264             csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1265             log_error(LOG_LEVEL_CONNECT,
1266                "Possible pipeline attempt detected. The connection will not "
1267                "be kept alive and we will only serve the first request.");
1268             /* Nuke the pipelined requests from orbit, just to be sure. */
1269             clear_iob(csp->client_iob);
1270          }
1271          else
1272          {
1273             /*
1274              * Keep the pipelined data around for now, we'll deal with
1275              * it once we're done serving the current request.
1276              */
1277             csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
1278             assert(csp->client_iob->eod >= csp->client_iob->cur);
1279             log_error(LOG_LEVEL_CONNECT, "Complete client request followed by "
1280                "%d bytes of pipelined data received.",
1281                (int)(csp->client_iob->eod - csp->client_iob->cur));
1282          }
1283       }
1284    }
1285    else
1286    {
1287       csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1288       log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
1289    }
1290 }
1291
1292
1293 /*********************************************************************
1294  *
1295  * Function    :  mark_server_socket_tainted
1296  *
1297  * Description :  Makes sure we don't reuse a server socket
1298  *                (if we didn't read everything the server sent
1299  *                us reusing the socket would lead to garbage).
1300  *
1301  * Parameters  :
1302  *          1  :  csp = Current client state (buffers, headers, etc...)
1303  *
1304  * Returns     :  void.
1305  *
1306  *********************************************************************/
1307 static void mark_server_socket_tainted(struct client_state *csp)
1308 {
1309    /*
1310     * For consistency we always mark the server socket
1311     * tainted, however, to reduce the log noise we only
1312     * emit a log message if the server socket could have
1313     * actually been reused.
1314     */
1315    if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
1316       && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED))
1317    {
1318       log_error(LOG_LEVEL_CONNECT,
1319          "Marking the server socket %d tainted.",
1320          csp->server_connection.sfd);
1321    }
1322    csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1323 }
1324
1325 /*********************************************************************
1326  *
1327  * Function    :  get_request_line
1328  *
1329  * Description : Read the client request line.
1330  *
1331  * Parameters  :
1332  *          1  :  csp = Current client state (buffers, headers, etc...)
1333  *
1334  * Returns     :  Pointer to request line or NULL in case of errors.
1335  *
1336  *********************************************************************/
1337 static char *get_request_line(struct client_state *csp)
1338 {
1339    char buf[BUFFER_SIZE];
1340    char *request_line = NULL;
1341    int len;
1342
1343    memset(buf, 0, sizeof(buf));
1344
1345    if ((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
1346    {
1347       /*
1348        * If there are multiple pipelined requests waiting,
1349        * the flag will be set again once the next request
1350        * has been parsed.
1351        */
1352       csp->flags &= ~CSP_FLAG_PIPELINED_REQUEST_WAITING;
1353
1354       request_line = get_header(csp->client_iob);
1355       if ((NULL != request_line) && ('\0' != *request_line))
1356       {
1357          return request_line;
1358       }
1359       else
1360       {
1361          log_error(LOG_LEVEL_CONNECT, "No complete request line "
1362             "received yet. Continuing reading from %d.", csp->cfd);
1363       }
1364    }
1365
1366    do
1367    {
1368       if (
1369 #ifdef FUZZ
1370           0 == (csp->flags & CSP_FLAG_FUZZED_INPUT) &&
1371 #endif
1372           !data_is_available(csp->cfd, csp->config->socket_timeout)
1373           )
1374       {
1375          if (socket_is_still_alive(csp->cfd))
1376          {
1377             log_error(LOG_LEVEL_CONNECT,
1378                "No request line on socket %d received in time. Timeout: %d.",
1379                csp->cfd, csp->config->socket_timeout);
1380             write_socket_delayed(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
1381                strlen(CLIENT_CONNECTION_TIMEOUT_RESPONSE),
1382                get_write_delay(csp));
1383          }
1384          else
1385          {
1386             log_error(LOG_LEVEL_CONNECT,
1387                "The client side of the connection on socket %d got "
1388                "closed without sending a complete request line.", csp->cfd);
1389          }
1390          return NULL;
1391       }
1392
1393       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1394
1395       if (len <= 0) return NULL;
1396
1397       /*
1398        * If there is no memory left for buffering the
1399        * request, there is nothing we can do but hang up
1400        */
1401       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1402       {
1403          return NULL;
1404       }
1405
1406       request_line = get_header(csp->client_iob);
1407
1408    } while ((NULL != request_line) && ('\0' == *request_line));
1409
1410    return request_line;
1411
1412 }
1413
1414 enum chunk_status
1415 {
1416    CHUNK_STATUS_MISSING_DATA,
1417    CHUNK_STATUS_BODY_COMPLETE,
1418    CHUNK_STATUS_PARSE_ERROR
1419 };
1420
1421
1422 /*********************************************************************
1423  *
1424  * Function    :  chunked_body_is_complete
1425  *
1426  * Description :  Figures out whether or not a chunked body is complete.
1427  *
1428  *                Currently it always starts at the beginning of the
1429  *                buffer which is somewhat wasteful and prevents Privoxy
1430  *                from starting to forward the correctly parsed chunks
1431  *                as soon as theoretically possible.
1432  *
1433  *                Should be modified to work with a common buffer,
1434  *                and allow the caller to skip already parsed chunks.
1435  *
1436  *                This would allow the function to be used for unbuffered
1437  *                response bodies as well.
1438  *
1439  * Parameters  :
1440  *          1  :  iob = Buffer with the body to check.
1441  *          2  :  length = Length of complete body
1442  *
1443  * Returns     :  Enum with the result of the check.
1444  *
1445  *********************************************************************/
1446 static enum chunk_status chunked_body_is_complete(struct iob *iob, size_t *length)
1447 {
1448    unsigned int chunksize;
1449    char *p = iob->cur;
1450
1451    do
1452    {
1453       /*
1454        * We need at least a single digit, followed by "\r\n",
1455        * followed by an unknown amount of data, followed by "\r\n".
1456        */
1457       if (p + 5 > iob->eod)
1458       {
1459          return CHUNK_STATUS_MISSING_DATA;
1460       }
1461       if (sscanf(p, "%x", &chunksize) != 1)
1462       {
1463          return CHUNK_STATUS_PARSE_ERROR;
1464       }
1465
1466       /*
1467        * We want at least a single digit, followed by "\r\n",
1468        * followed by the specified amount of data, followed by "\r\n".
1469        */
1470       if (p + chunksize + 5 > iob->eod)
1471       {
1472          return CHUNK_STATUS_MISSING_DATA;
1473       }
1474
1475       /* Skip chunk-size. */
1476       p = strstr(p, "\r\n");
1477       if (NULL == p)
1478       {
1479          return CHUNK_STATUS_PARSE_ERROR;
1480       }
1481       /* Move beyond the chunkdata. */
1482       p += 2 + chunksize;
1483
1484       /* There should be another "\r\n" to skip */
1485       if (memcmp(p, "\r\n", 2))
1486       {
1487          return CHUNK_STATUS_PARSE_ERROR;
1488       }
1489       p += 2;
1490    } while (chunksize > 0U);
1491
1492    *length = (size_t)(p - iob->cur);
1493    assert(*length <= (size_t)(iob->eod - iob->cur));
1494    assert(p <= iob->eod);
1495
1496    return CHUNK_STATUS_BODY_COMPLETE;
1497
1498 }
1499
1500
1501 /*********************************************************************
1502  *
1503  * Function    : receive_chunked_client_request_body
1504  *
1505  * Description : Read the chunk-encoded client request body.
1506  *               Failures are dealt with.
1507  *
1508  * Parameters  :
1509  *          1  :  csp = Current client state (buffers, headers, etc...)
1510  *
1511  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1512  *
1513  *********************************************************************/
1514 static jb_err receive_chunked_client_request_body(struct client_state *csp)
1515 {
1516    size_t body_length;
1517    enum chunk_status status;
1518
1519    while (CHUNK_STATUS_MISSING_DATA ==
1520       (status = chunked_body_is_complete(csp->client_iob, &body_length)))
1521    {
1522       char buf[BUFFER_SIZE];
1523       int len;
1524
1525       if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1526       {
1527          log_error(LOG_LEVEL_ERROR,
1528             "Timeout while waiting for the client body.");
1529          break;
1530       }
1531       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1532       if (len <= 0)
1533       {
1534          log_error(LOG_LEVEL_ERROR, "Read the client body failed: %E");
1535          break;
1536       }
1537       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1538       {
1539          break;
1540       }
1541    }
1542    if (status != CHUNK_STATUS_BODY_COMPLETE)
1543    {
1544       write_socket_delayed(csp->cfd, CLIENT_BODY_PARSE_ERROR_RESPONSE,
1545          strlen(CLIENT_BODY_PARSE_ERROR_RESPONSE), get_write_delay(csp));
1546       log_error(LOG_LEVEL_CLF,
1547          "%s - - [%T] \"Failed reading chunked client body\" 400 0", csp->ip_addr_str);
1548       return JB_ERR_PARSE;
1549    }
1550    log_error(LOG_LEVEL_CONNECT,
1551       "Chunked client body completely read. Length: %lu", body_length);
1552    csp->expected_client_content_length = body_length;
1553
1554    return JB_ERR_OK;
1555
1556 }
1557
1558
1559 #ifdef FUZZ
1560 /*********************************************************************
1561  *
1562  * Function    :  fuzz_chunked_transfer_encoding
1563  *
1564  * Description :  Treat the fuzzed input as chunked transfer encoding
1565  *                to check and dechunk.
1566  *
1567  * Parameters  :
1568  *          1  :  csp      = Used to store the data.
1569  *          2  :  fuzz_input_file = File to read the input from.
1570  *
1571  * Returns     : Result of dechunking
1572  *
1573  *********************************************************************/
1574 extern int fuzz_chunked_transfer_encoding(struct client_state *csp, char *fuzz_input_file)
1575 {
1576    size_t length;
1577    size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
1578    enum chunk_status status;
1579
1580    status = chunked_body_is_complete(csp->iob, &length);
1581    if (CHUNK_STATUS_BODY_COMPLETE != status)
1582    {
1583       log_error(LOG_LEVEL_INFO, "Chunked body is incomplete or invalid");
1584    }
1585
1586    return (JB_ERR_OK == remove_chunked_transfer_coding(csp->iob->cur, &size));
1587
1588 }
1589
1590
1591 /*********************************************************************
1592  *
1593  * Function    : fuzz_client_request
1594  *
1595  * Description : Try to get a client request from the fuzzed input.
1596  *
1597  * Parameters  :
1598  *          1  :  csp = Current client state (buffers, headers, etc...)
1599  *          2  :  fuzz_input_file = File to read the input from.
1600  *
1601  * Returns     :  Result of fuzzing.
1602  *
1603  *********************************************************************/
1604 extern int fuzz_client_request(struct client_state *csp, char *fuzz_input_file)
1605 {
1606    jb_err err;
1607
1608    csp->cfd = 0;
1609    csp->ip_addr_str = "fuzzer";
1610
1611    if (strcmp(fuzz_input_file, "-") != 0)
1612    {
1613       log_error(LOG_LEVEL_FATAL,
1614          "Fuzzed client requests can currently only be read from stdin (-).");
1615    }
1616    err = receive_client_request(csp);
1617    if (err != JB_ERR_OK)
1618    {
1619       return 1;
1620    }
1621    err = parse_client_request(csp);
1622    if (err != JB_ERR_OK)
1623    {
1624       return 1;
1625    }
1626
1627    return 0;
1628
1629 }
1630 #endif  /* def FUZZ */
1631
1632
1633 #ifdef FEATURE_FORCE_LOAD
1634 /*********************************************************************
1635  *
1636  * Function    :  force_required
1637  *
1638  * Description : Checks a request line to see if it contains
1639  *               the FORCE_PREFIX. If it does, it is removed
1640  *               unless enforcing requests has beend disabled.
1641  *
1642  * Parameters  :
1643  *          1  :  request_line = HTTP request line
1644  *
1645  * Returns     :  TRUE if force is required, FALSE otherwise.
1646  *
1647  *********************************************************************/
1648 static int force_required(const struct client_state *csp, char *request_line)
1649 {
1650    char *p;
1651
1652    p = strstr(request_line, "http://");
1653    if (p != NULL)
1654    {
1655       /* Skip protocol */
1656       p += strlen("http://");
1657    }
1658    else
1659    {
1660       /* Intercepted request usually don't specify the protocol. */
1661       p = request_line;
1662    }
1663
1664    /* Go to the beginning of the path */
1665    p = strstr(p, "/");
1666    if (p == NULL)
1667    {
1668       /*
1669        * If the path is missing the request line is invalid and we
1670        * are done here. The client-visible rejection happens later on.
1671        */
1672       return 0;
1673    }
1674
1675    if (0 == strncmpic(p, FORCE_PREFIX, strlen(FORCE_PREFIX) - 1))
1676    {
1677       if (!(csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS))
1678       {
1679          /* XXX: Should clean more carefully */
1680          strclean(request_line, FORCE_PREFIX);
1681          log_error(LOG_LEVEL_FORCE,
1682             "Enforcing request: \"%s\".", request_line);
1683
1684          return 1;
1685       }
1686       log_error(LOG_LEVEL_FORCE,
1687          "Ignored force prefix in request: \"%s\".", request_line);
1688    }
1689
1690    return 0;
1691
1692 }
1693 #endif /* def FEATURE_FORCE_LOAD */
1694
1695
1696 /*********************************************************************
1697  *
1698  * Function    :  receive_client_request
1699  *
1700  * Description : Read the client's request (more precisely the
1701  *               client headers) and answer it if necessary.
1702  *
1703  * Parameters  :
1704  *          1  :  csp = Current client state (buffers, headers, etc...)
1705  *
1706  * Returns     :  JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1707  *
1708  *********************************************************************/
1709 static jb_err receive_client_request(struct client_state *csp)
1710 {
1711    char buf[BUFFER_SIZE];
1712    char *p;
1713    char *req = NULL;
1714    struct http_request *http;
1715    int len;
1716    jb_err err;
1717
1718    /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1719    struct list header_list;
1720    struct list *headers = &header_list;
1721
1722    /* We don't care if the arriving data is a valid HTTP request or not. */
1723    csp->requests_received_total++;
1724
1725    http = csp->http;
1726
1727    memset(buf, 0, sizeof(buf));
1728
1729    req = get_request_line(csp);
1730    if (req == NULL)
1731    {
1732       mark_server_socket_tainted(csp);
1733       return JB_ERR_PARSE;
1734    }
1735    assert(*req != '\0');
1736
1737    if (client_protocol_is_unsupported(csp, req))
1738    {
1739       return JB_ERR_PARSE;
1740    }
1741
1742 #ifdef FEATURE_FORCE_LOAD
1743    if (force_required(csp, req))
1744    {
1745       csp->flags |= CSP_FLAG_FORCED;
1746    }
1747 #endif /* def FEATURE_FORCE_LOAD */
1748
1749    err = parse_http_request(req, http);
1750    freez(req);
1751    if (JB_ERR_OK != err)
1752    {
1753       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1754          get_write_delay(csp));
1755       /* XXX: Use correct size */
1756       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1757       log_error(LOG_LEVEL_ERROR,
1758          "Couldn't parse request line received from %s: %s",
1759          csp->ip_addr_str, jb_err_to_string(err));
1760
1761       free_http_request(http);
1762       return JB_ERR_PARSE;
1763    }
1764
1765    /* grab the rest of the client's headers */
1766    init_list(headers);
1767    for (;;)
1768    {
1769       p = get_header(csp->client_iob);
1770
1771       if (p == NULL)
1772       {
1773          /* There are no additional headers to read. */
1774          break;
1775       }
1776
1777       if (*p == '\0')
1778       {
1779          /*
1780           * We didn't receive a complete header
1781           * line yet, get the rest of it.
1782           */
1783          if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1784          {
1785             log_error(LOG_LEVEL_ERROR,
1786                "Stopped grabbing the client headers.");
1787             destroy_list(headers);
1788             return JB_ERR_PARSE;
1789          }
1790
1791          len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1792          if (len <= 0)
1793          {
1794             log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1795             destroy_list(headers);
1796             return JB_ERR_PARSE;
1797          }
1798
1799          if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1800          {
1801             /*
1802              * If there is no memory left for buffering the
1803              * request, there is nothing we can do but hang up
1804              */
1805             destroy_list(headers);
1806             return JB_ERR_MEMORY;
1807          }
1808       }
1809       else
1810       {
1811          if (!strncmpic(p, "Transfer-Encoding:", 18))
1812          {
1813             /*
1814              * XXX: should be called through sed()
1815              *      but currently can't.
1816              */
1817             client_transfer_encoding(csp, &p);
1818          }
1819          /*
1820           * We were able to read a complete
1821           * header and can finally enlist it.
1822           */
1823          enlist(headers, p);
1824          freez(p);
1825       }
1826    }
1827
1828    if (http->host == NULL)
1829    {
1830       /*
1831        * If we still don't know the request destination,
1832        * the request is invalid or the client uses
1833        * Privoxy without its knowledge.
1834        */
1835       if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1836       {
1837          /*
1838           * Our attempts to get the request destination
1839           * elsewhere failed or Privoxy is configured
1840           * to only accept proxy requests.
1841           *
1842           * An error response has already been send
1843           * and we're done here.
1844           */
1845          return JB_ERR_PARSE;
1846       }
1847    }
1848
1849 #ifdef FEATURE_CLIENT_TAGS
1850    /* XXX: If the headers were enlisted sooner, passing csp would do. */
1851    set_client_address(csp, headers);
1852    get_tag_list_for_client(csp->client_tags, csp->client_address);
1853 #endif
1854
1855    /*
1856     * Determine the actions for this URL
1857     */
1858 #ifdef FEATURE_TOGGLE
1859    if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1860    {
1861       /* Most compatible set of actions (i.e. none) */
1862       init_current_action(csp->action);
1863    }
1864    else
1865 #endif /* ndef FEATURE_TOGGLE */
1866    {
1867       get_url_actions(csp, http);
1868    }
1869
1870    enlist(csp->headers, http->cmd);
1871
1872    /* Append the previously read headers */
1873    err = list_append_list_unique(csp->headers, headers);
1874    destroy_list(headers);
1875
1876    return err;
1877
1878 }
1879
1880
1881 /*********************************************************************
1882  *
1883  * Function    : parse_client_request
1884  *
1885  * Description : Parses the client's request and decides what to do
1886  *               with it.
1887  *
1888  *               Note that since we're not using select() we could get
1889  *               blocked here if a client connected, then didn't say
1890  *               anything!
1891  *
1892  * Parameters  :
1893  *          1  :  csp = Current client state (buffers, headers, etc...)
1894  *
1895  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1896  *
1897  *********************************************************************/
1898 static jb_err parse_client_request(struct client_state *csp)
1899 {
1900    struct http_request *http = csp->http;
1901    jb_err err;
1902
1903 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1904    if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
1905     && (!strcmpic(csp->http->version, "HTTP/1.1"))
1906     && (csp->http->ssl == 0))
1907    {
1908       /* Assume persistence until further notice */
1909       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
1910    }
1911 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1912
1913    if (csp->http->ssl == 0)
1914    {
1915       /*
1916        * This whole block belongs to chat() but currently
1917        * has to be executed before sed().
1918        */
1919       if (csp->flags & CSP_FLAG_CHUNKED_CLIENT_BODY)
1920       {
1921          if (receive_chunked_client_request_body(csp) != JB_ERR_OK)
1922          {
1923             return JB_ERR_PARSE;
1924          }
1925       }
1926       else
1927       {
1928          csp->expected_client_content_length = get_expected_content_length(csp->headers);
1929       }
1930       verify_request_length(csp);
1931    }
1932 #ifndef FEATURE_HTTPS_INSPECTION
1933    else
1934    {
1935       csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1936    }
1937 #endif
1938
1939    err = sed(csp, FILTER_CLIENT_HEADERS);
1940    if (JB_ERR_OK != err)
1941    {
1942       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
1943          csp->ip_addr_str);
1944       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1945          csp->ip_addr_str, csp->http->cmd);
1946       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER), get_write_delay(csp));
1947       return JB_ERR_PARSE;
1948    }
1949    csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
1950
1951    /* Check request line for rewrites. */
1952    if ((NULL == csp->headers->first->str)
1953       || (strcmp(http->cmd, csp->headers->first->str) &&
1954          (JB_ERR_OK != change_request_destination(csp))))
1955    {
1956       /*
1957        * A header filter broke the request line - bail out.
1958        */
1959       write_socket_delayed(csp->cfd, MESSED_UP_REQUEST_RESPONSE,
1960          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
1961       /* XXX: Use correct size */
1962       log_error(LOG_LEVEL_CLF,
1963          "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
1964       log_error(LOG_LEVEL_ERROR,
1965          "Invalid request line after applying header filters.");
1966       free_http_request(http);
1967
1968       return JB_ERR_PARSE;
1969    }
1970
1971    if (client_has_unsupported_expectations(csp))
1972    {
1973       return JB_ERR_PARSE;
1974    }
1975
1976    return JB_ERR_OK;
1977
1978 }
1979
1980
1981 /*********************************************************************
1982  *
1983  * Function    : send_http_request
1984  *
1985  * Description : Sends the HTTP headers from the client request
1986  *               and all the body data that has already been received.
1987  *
1988  * Parameters  :
1989  *          1  :  csp = Current client state (buffers, headers, etc...)
1990  *
1991  * Returns     :  0 on success, anything else is an error.
1992  *
1993  *********************************************************************/
1994 static int send_http_request(struct client_state *csp)
1995 {
1996    char *hdr;
1997    int write_failure;
1998
1999    hdr = list_to_text(csp->headers);
2000    if (hdr == NULL)
2001    {
2002       /* FIXME Should handle error properly */
2003       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2004    }
2005    list_remove_all(csp->headers);
2006
2007    /*
2008     * Write the client's (modified) header to the server
2009     * (along with anything else that may be in the buffer)
2010     */
2011    write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
2012    freez(hdr);
2013
2014    if (write_failure)
2015    {
2016       log_error(LOG_LEVEL_CONNECT, "Failed sending request headers to: %s: %E",
2017          csp->http->hostport);
2018    }
2019    else if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2020       && (flush_iob(csp->server_connection.sfd, csp->client_iob, 0) < 0))
2021    {
2022       write_failure = 1;
2023       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2024          csp->http->hostport);
2025    }
2026
2027    return write_failure;
2028
2029 }
2030
2031
2032 #ifdef FEATURE_HTTPS_INSPECTION
2033 /*********************************************************************
2034  *
2035  * Function    : receive_and_send_encrypted_post_data
2036  *
2037  * Description : Reads remaining POST data from the client and sends
2038  *               it to the server.
2039  *
2040  * Parameters  :
2041  *          1  :  csp = Current client state (buffers, headers, etc...)
2042  *
2043  * Returns     :  0 on success, anything else is an error.
2044  *
2045  *********************************************************************/
2046 static int receive_and_send_encrypted_post_data(struct client_state *csp)
2047 {
2048    int content_length_known = csp->expected_client_content_length != 0;
2049
2050    while (is_ssl_pending(&(csp->ssl_client_attr))
2051       || (content_length_known && csp->expected_client_content_length != 0))
2052    {
2053       unsigned char buf[BUFFER_SIZE];
2054       int len;
2055       int max_bytes_to_read = sizeof(buf);
2056
2057       if (content_length_known && csp->expected_client_content_length < sizeof(buf))
2058       {
2059          max_bytes_to_read = (int)csp->expected_client_content_length;
2060       }
2061       log_error(LOG_LEVEL_CONNECT,
2062          "Waiting for up to %d bytes of POST data from the client.",
2063          max_bytes_to_read);
2064       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2065          (unsigned)max_bytes_to_read);
2066       if (len == -1)
2067       {
2068          return 1;
2069       }
2070       if (len == 0)
2071       {
2072          /* XXX: Does this actually happen? */
2073          break;
2074       }
2075       log_error(LOG_LEVEL_CONNECT, "Forwarding %d bytes of encrypted POST data",
2076          len);
2077       len = ssl_send_data(&(csp->ssl_server_attr), buf, (size_t)len);
2078       if (len == -1)
2079       {
2080          return 1;
2081       }
2082       if (csp->expected_client_content_length != 0)
2083       {
2084          if (csp->expected_client_content_length >= len)
2085          {
2086             csp->expected_client_content_length -= (unsigned)len;
2087          }
2088          if (csp->expected_client_content_length == 0)
2089          {
2090             log_error(LOG_LEVEL_CONNECT, "Forwarded the last %d bytes", len);
2091             break;
2092          }
2093       }
2094    }
2095
2096    log_error(LOG_LEVEL_CONNECT, "Done forwarding encrypted POST data");
2097
2098    return 0;
2099
2100 }
2101
2102
2103 /*********************************************************************
2104  *
2105  * Function    : send_https_request
2106  *
2107  * Description : Sends the HTTP headers from the client request
2108  *               and all the body data that has already been received.
2109  *
2110  * Parameters  :
2111  *          1  :  csp = Current client state (buffers, headers, etc...)
2112  *
2113  * Returns     :  0 on success, anything else is an error.
2114  *
2115  *********************************************************************/
2116 static int send_https_request(struct client_state *csp)
2117 {
2118    char *hdr;
2119    int ret;
2120    long flushed = 0;
2121
2122    hdr = list_to_text(csp->https_headers);
2123    if (hdr == NULL)
2124    {
2125       /* FIXME Should handle error properly */
2126       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2127    }
2128    list_remove_all(csp->https_headers);
2129
2130    /*
2131     * Write the client's (modified) header to the server
2132     * (along with anything else that may be in the buffer)
2133     */
2134    ret = ssl_send_data(&(csp->ssl_server_attr),
2135       (const unsigned char *)hdr, strlen(hdr));
2136    freez(hdr);
2137
2138    if (ret < 0)
2139    {
2140       log_error(LOG_LEVEL_CONNECT,
2141          "Failed sending encrypted request headers to: %s: %E",
2142          csp->http->hostport);
2143       mark_server_socket_tainted(csp);
2144       return 1;
2145    }
2146
2147    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2148       && ((flushed = ssl_flush_socket(&(csp->ssl_server_attr),
2149             csp->client_iob)) < 0))
2150    {
2151       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2152          csp->http->hostport);
2153       return 1;
2154    }
2155    if (flushed != 0)
2156    {
2157       if (csp->expected_client_content_length != 0)
2158       {
2159          if (csp->expected_client_content_length < flushed)
2160          {
2161             log_error(LOG_LEVEL_ERROR,
2162                "Flushed %ld bytes of request body while only expecting %llu",
2163                flushed, csp->expected_client_content_length);
2164             csp->expected_client_content_length = 0;
2165          }
2166          else
2167          {
2168             log_error(LOG_LEVEL_CONNECT,
2169                "Flushed %ld bytes of request body while expecting %llu",
2170                flushed, csp->expected_client_content_length);
2171             csp->expected_client_content_length -= (unsigned)flushed;
2172             if (receive_and_send_encrypted_post_data(csp))
2173             {
2174                return 1;
2175             }
2176          }
2177       }
2178       else
2179       {
2180          log_error(LOG_LEVEL_CONNECT,
2181             "Flushed %ld bytes of request body", flushed);
2182       }
2183    }
2184
2185    log_error(LOG_LEVEL_CONNECT, "Encrypted request sent");
2186
2187    return 0;
2188
2189 }
2190
2191
2192 /*********************************************************************
2193  *
2194  * Function    :  receive_encrypted_request
2195  *
2196  * Description :  Receives an encrypted request.
2197  *
2198  * Parameters  :
2199  *          1  :  csp = Current client state (buffers, headers, etc...)
2200  *
2201  * Returns     :  JB_ERR_OK on success,
2202  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2203  *
2204  *********************************************************************/
2205 static jb_err receive_encrypted_request(struct client_state *csp)
2206 {
2207    char buf[BUFFER_SIZE];
2208    int len;
2209    char *p;
2210
2211    do
2212    {
2213       log_error(LOG_LEVEL_HEADER, "Reading encrypted headers");
2214       if (!is_ssl_pending(&(csp->ssl_client_attr)) &&
2215           !data_is_available(csp->cfd, csp->config->socket_timeout))
2216       {
2217          log_error(LOG_LEVEL_CONNECT,
2218             "Socket %d timed out while waiting for client headers", csp->cfd);
2219          return JB_ERR_PARSE;
2220       }
2221       len = ssl_recv_data(&(csp->ssl_client_attr),
2222          (unsigned char *)buf, sizeof(buf));
2223       if (len == 0)
2224       {
2225          log_error(LOG_LEVEL_CONNECT,
2226             "Socket %d closed while waiting for client headers", csp->cfd);
2227          return JB_ERR_PARSE;
2228       }
2229       if (len == -1)
2230       {
2231          return JB_ERR_PARSE;
2232       }
2233       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2234       {
2235          return JB_ERR_MEMORY;
2236       }
2237       p = strstr(csp->client_iob->cur, "\r\n\r\n");
2238    } while (p == NULL);
2239
2240    log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2241
2242    return JB_ERR_OK;
2243 }
2244
2245
2246 /*********************************************************************
2247  *
2248  * Function    :  process_encrypted_request
2249  *
2250  * Description :  Receives and parses an encrypted request.
2251  *
2252  * Parameters  :
2253  *          1  :  csp = Current client state (buffers, headers, etc...)
2254  *
2255  * Returns     :  JB_ERR_OK on success,
2256  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2257  *
2258  *********************************************************************/
2259 static jb_err process_encrypted_request(struct client_state *csp)
2260 {
2261    char *p;
2262    char *request_line;
2263    jb_err err;
2264    /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2265    struct list header_list;
2266    struct list *headers = &header_list;
2267
2268    assert(csp->ssl_with_client_is_opened);
2269
2270 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2271    if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2272    {
2273       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2274    }
2275 #endif
2276    err = receive_encrypted_request(csp);
2277    if (err != JB_ERR_OK)
2278    {
2279       if (csp->client_iob->cur == NULL)
2280       {
2281          /*
2282           * We did not receive any data, most likely because the
2283           * client is done. Don't log this as a parse failure.
2284           */
2285          return JB_ERR_PARSE;
2286       }
2287       /* XXX: Also used for JB_ERR_MEMORY */
2288       log_error(LOG_LEVEL_ERROR, "Failed to receive encrypted request: %s",
2289          jb_err_to_string(err));
2290       ssl_send_data_delayed(&(csp->ssl_client_attr),
2291          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2292       return err;
2293    }
2294
2295    /* We don't need get_request_line() because the whole HTTP head is buffered. */
2296    request_line = get_header(csp->client_iob);
2297    if (request_line == NULL)
2298    {
2299       log_error(LOG_LEVEL_ERROR, "Failed to get the encrypted request line");
2300       ssl_send_data_delayed(&(csp->ssl_client_attr),
2301          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2302       return JB_ERR_PARSE;
2303    }
2304    assert(*request_line != '\0');
2305
2306    if (client_protocol_is_unsupported(csp, request_line))
2307    {
2308       /*
2309        * If the protocol is unsupported we're done here.
2310        * client_protocol_is_unsupported() took care of sending
2311        * the error response and logging the error message.
2312        */
2313       return JB_ERR_PARSE;
2314    }
2315
2316 #ifdef FEATURE_FORCE_LOAD
2317    if (force_required(csp, request_line))
2318    {
2319       csp->flags |= CSP_FLAG_FORCED;
2320    }
2321 #endif /* def FEATURE_FORCE_LOAD */
2322
2323    free_http_request(csp->http);
2324
2325    err = parse_http_request(request_line, csp->http);
2326    /* XXX: Restore ssl setting. This is ugly */
2327    csp->http->client_ssl = 1;
2328    csp->http->server_ssl = 1;
2329
2330    freez(request_line);
2331    if (JB_ERR_OK != err)
2332    {
2333       ssl_send_data_delayed(&(csp->ssl_client_attr),
2334          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2335       /* XXX: Use correct size */
2336       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2337       log_error(LOG_LEVEL_ERROR,
2338          "Couldn't parse request line received from %s: %s",
2339          csp->ip_addr_str, jb_err_to_string(err));
2340
2341       free_http_request(csp->http);
2342       return JB_ERR_PARSE;
2343    }
2344
2345    /* Parse the rest of the client's headers. */
2346    init_list(headers);
2347    for (;;)
2348    {
2349       p = get_header(csp->client_iob);
2350
2351       if (p == NULL)
2352       {
2353          /* There are no additional headers to read. */
2354          break;
2355       }
2356       enlist(headers, p);
2357       freez(p);
2358    }
2359
2360    if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2361    {
2362       /*
2363        * Our attempts to get the request destination
2364        * elsewhere failed.
2365        */
2366       log_error(LOG_LEVEL_ERROR,
2367          "Failed to get the encrypted request destination");
2368       ssl_send_data_delayed(&(csp->ssl_client_attr),
2369          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2370       return JB_ERR_PARSE;
2371    }
2372
2373    /* Split the domain we just got for pattern matching */
2374    init_domain_components(csp->http);
2375
2376 #ifdef FEATURE_CLIENT_TAGS
2377    /* XXX: If the headers were enlisted sooner, passing csp would do. */
2378    if (csp->client_address == NULL)
2379    {
2380       set_client_address(csp, headers);
2381       get_tag_list_for_client(csp->client_tags, csp->client_address);
2382    }
2383 #endif
2384
2385 #ifdef FEATURE_TOGGLE
2386    if ((csp->flags & CSP_FLAG_TOGGLED_ON) != 0)
2387 #endif
2388    {
2389       /*
2390        * Determine the actions for this request after
2391        * clearing the ones from the previous one.
2392        */
2393       free_current_action(csp->action);
2394       get_url_actions(csp, csp->http);
2395    }
2396
2397    enlist(csp->https_headers, csp->http->cmd);
2398
2399    /* Append the previously read headers */
2400    err = list_append_list_unique(csp->https_headers, headers);
2401    destroy_list(headers);
2402    if (JB_ERR_OK != err)
2403    {
2404       /* XXX: Send error message */
2405       return err;
2406    }
2407
2408    /* XXX: Work around crash */
2409    csp->error_message = NULL;
2410
2411    /* XXX: Why do this here? */
2412    csp->http->ssl = 1;
2413
2414    err = sed_https(csp);
2415    if (JB_ERR_OK != err)
2416    {
2417       ssl_send_data_delayed(&(csp->ssl_client_attr),
2418          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2419       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2420          csp->ip_addr_str);
2421       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2422          csp->ip_addr_str, csp->http->cmd);
2423       return JB_ERR_PARSE;
2424    }
2425
2426    log_error(LOG_LEVEL_HEADER, "Encrypted request processed");
2427    log_applied_actions(csp->action);
2428    log_error(LOG_LEVEL_REQUEST, "https://%s%s", csp->http->hostport,
2429       csp->http->path);
2430
2431    return err;
2432
2433 }
2434
2435 /*********************************************************************
2436  *
2437  * Function    :  cgi_page_requested
2438  *
2439  * Description :  Checks if a request is for an internal CGI page.
2440  *
2441  * Parameters  :
2442  *          1  :  host = The host requested by the client.
2443  *
2444  * Returns     :  1 if a CGI page has been requested, 0 otherwise
2445  *
2446  *********************************************************************/
2447 static int cgi_page_requested(const char *host)
2448 {
2449    if ((0 == strcmpic(host, CGI_SITE_1_HOST))
2450     || (0 == strcmpic(host, CGI_SITE_1_HOST "."))
2451     || (0 == strcmpic(host, CGI_SITE_2_HOST))
2452     || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
2453    {
2454       return 1;
2455    }
2456
2457    return 0;
2458
2459 }
2460
2461
2462 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2463 /*********************************************************************
2464  *
2465  * Function    :  continue_https_chat
2466  *
2467  * Description :  Behaves similar to chat() but only deals with
2468  *                https-inspected requests that arrive on an already
2469  *                established connection. The first request is always
2470  *                served by chat() which is a lot more complex as it
2471  *                has to deal with forwarding settings and connection
2472  *                failures etc.
2473  *
2474  *                If a connection to the server has already been
2475  *                opened it is reused unless the request is blocked
2476  *                or the forwarder changed.
2477  *
2478  *                If a connection to the server has not yet been
2479  *                opened (because the previous request was crunched),
2480  *                or the forwarder changed, the connection is dropped
2481  *                so that the client retries on a fresh one.
2482  *
2483  * Parameters  :
2484  *          1  :  csp = Current client state (buffers, headers, etc...)
2485  *
2486  * Returns     :  Nothing.
2487  *
2488  *********************************************************************/
2489 static void continue_https_chat(struct client_state *csp)
2490 {
2491    const struct forward_spec *fwd;
2492
2493    if (JB_ERR_OK != process_encrypted_request(csp))
2494    {
2495       return;
2496    }
2497
2498    csp->requests_received_total++;
2499
2500    /*
2501     * We have an encrypted request. Check if one of the crunchers wants it.
2502     */
2503    if (crunch_response_triggered(csp, crunchers_all))
2504    {
2505       /*
2506        * Yes. The client got the crunch response and we're done here.
2507        */
2508       return;
2509    }
2510    if (csp->ssl_with_server_is_opened == 0)
2511    {
2512       log_error(LOG_LEVEL_CONNECT,
2513          "Dropping the client connection on socket %d. "
2514          "The server connection has not been established yet.",
2515          csp->cfd);
2516       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2517       return;
2518    }
2519    assert(csp->server_connection.sfd != JB_INVALID_SOCKET);
2520
2521    fwd = forward_url(csp, csp->http);
2522    if (!connection_destination_matches(&csp->server_connection, csp->http, fwd))
2523    {
2524       log_error(LOG_LEVEL_CONNECT,
2525          "Dropping the client connection on socket %d with "
2526          "server socket %d connected to %s. The forwarder has changed.",
2527          csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
2528       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2529       return;
2530    }
2531
2532    log_error(LOG_LEVEL_CONNECT,
2533       "Reusing server socket %d connected to %s. Requests already sent: %u.",
2534       csp->server_connection.sfd, csp->server_connection.host,
2535       csp->server_connection.requests_sent_total);
2536
2537    if (send_https_request(csp))
2538    {
2539       /*
2540        * Most likely the server connection timed out. We can't easily
2541        * create a new one so simply drop the client connection without a
2542        * error response to let the client retry.
2543        */
2544       log_error(LOG_LEVEL_CONNECT,
2545          "Dropping client connection on socket %d. "
2546          "Forwarding the encrypted client request failed.",
2547          csp->cfd);
2548       return;
2549    }
2550    csp->server_connection.requests_sent_total++;
2551    handle_established_connection(csp);
2552    freez(csp->receive_buffer);
2553 }
2554 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2555 #endif
2556
2557
2558 /*********************************************************************
2559  *
2560  * Function    :  handle_established_connection
2561  *
2562  * Description :  Shuffle data between client and server once the
2563  *                connection has been established.
2564  *
2565  * Parameters  :
2566  *          1  :  csp = Current client state (buffers, headers, etc...)
2567  *
2568  * Returns     :  Nothing.
2569  *
2570  *********************************************************************/
2571 static void handle_established_connection(struct client_state *csp)
2572 {
2573    char *hdr;
2574    char *p;
2575    int n;
2576 #ifdef HAVE_POLL
2577    struct pollfd poll_fds[2];
2578 #else
2579    fd_set rfds;
2580    jb_socket maxfd;
2581    struct timeval timeout;
2582 #endif
2583    int server_body;
2584    int ms_iis5_hack = 0;
2585    unsigned long long byte_count = 0;
2586    struct http_request *http;
2587    long len = 0; /* for buffer sizes (and negative error codes) */
2588    int buffer_and_filter_content = 0;
2589    unsigned int write_delay;
2590 #ifdef FEATURE_HTTPS_INSPECTION
2591    int ret = 0;
2592    int use_ssl_tunnel = 0;
2593    csp->dont_verify_certificate = 0;
2594
2595    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION))
2596    {
2597       /* Pass encrypted content without filtering. */
2598       use_ssl_tunnel = 1;
2599    }
2600 #endif
2601
2602    /* Skeleton for HTTP response, if we should intercept the request */
2603    struct http_response *rsp;
2604 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2605    int watch_client_socket;
2606 #endif
2607
2608    csp->receive_buffer_size = csp->config->receive_buffer_size;
2609    csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
2610    if (csp->receive_buffer == NULL)
2611    {
2612       log_error(LOG_LEVEL_ERROR,
2613          "Out of memory. Failed to allocate the receive buffer.");
2614       rsp = cgi_error_memory();
2615       send_crunch_response(csp, rsp);
2616       return;
2617    }
2618
2619    http = csp->http;
2620
2621 #ifndef HAVE_POLL
2622    maxfd = (csp->cfd > csp->server_connection.sfd) ?
2623       csp->cfd : csp->server_connection.sfd;
2624 #endif
2625
2626    /* pass data between the client and server
2627     * until one or the other shuts down the connection.
2628     */
2629
2630    server_body = 0;
2631
2632 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2633    watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
2634 #endif
2635    write_delay = get_write_delay(csp);
2636
2637    for (;;)
2638    {
2639 #ifndef HAVE_POLL
2640       FD_ZERO(&rfds);
2641 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2642       if (!watch_client_socket)
2643       {
2644          maxfd = csp->server_connection.sfd;
2645       }
2646       else
2647 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2648       {
2649          FD_SET(csp->cfd, &rfds);
2650       }
2651
2652       FD_SET(csp->server_connection.sfd, &rfds);
2653 #endif /* ndef HAVE_POLL */
2654
2655 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2656       if ((csp->flags & CSP_FLAG_CHUNKED)
2657          && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2658          && ((csp->iob->eod - csp->iob->cur) >= 5)
2659          && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2660       {
2661          /*
2662           * XXX: This check should be obsolete now,
2663           *      but let's wait a while to be sure.
2664           */
2665          log_error(LOG_LEVEL_CONNECT,
2666             "Looks like we got the last chunk together with "
2667             "the server headers but didn't detect it earlier. "
2668             "We better stop reading.");
2669          byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
2670          csp->expected_content_length = byte_count;
2671          csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2672       }
2673       if (server_body && server_response_is_complete(csp, byte_count))
2674       {
2675          if (csp->expected_content_length == byte_count)
2676          {
2677             log_error(LOG_LEVEL_CONNECT,
2678                "Done reading from server. Content length: %llu as expected. "
2679                "Bytes most recently read: %ld.",
2680                byte_count, len);
2681          }
2682          else
2683          {
2684             log_error(LOG_LEVEL_CONNECT,
2685                "Done reading from server. Expected content length: %llu. "
2686                "Actual content length: %llu. Bytes most recently read: %ld.",
2687                csp->expected_content_length, byte_count, len);
2688          }
2689          len = 0;
2690          /*
2691           * XXX: Should not jump around, handle_established_connection()
2692           * is complicated enough already.
2693           */
2694          goto reading_done;
2695       }
2696 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
2697
2698 #ifdef HAVE_POLL
2699       poll_fds[0].fd = csp->cfd;
2700 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2701       if (!watch_client_socket)
2702       {
2703          /*
2704           * Ignore incoming data, but still watch out
2705           * for disconnects etc. These flags are always
2706           * implied anyway but explicitly setting them
2707           * doesn't hurt.
2708           */
2709          poll_fds[0].events = POLLERR|POLLHUP;
2710       }
2711       else
2712 #endif
2713       {
2714          poll_fds[0].events = POLLIN;
2715       }
2716       poll_fds[1].fd = csp->server_connection.sfd;
2717       poll_fds[1].events = POLLIN;
2718       n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
2719 #else
2720       timeout.tv_sec = csp->config->socket_timeout;
2721       timeout.tv_usec = 0;
2722       n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
2723 #endif /* def HAVE_POLL */
2724
2725       /*server or client not responding in timeout */
2726       if (n == 0)
2727       {
2728          log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
2729             csp->config->socket_timeout, http->url);
2730          if ((byte_count == 0) && (http->ssl == 0))
2731          {
2732             send_crunch_response(csp, error_response(csp, "connection-timeout"));
2733          }
2734          mark_server_socket_tainted(csp);
2735 #ifdef FEATURE_HTTPS_INSPECTION
2736          close_client_and_server_ssl_connections(csp);
2737 #endif
2738          return;
2739       }
2740       else if (n < 0)
2741       {
2742 #ifdef HAVE_POLL
2743          log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
2744 #else
2745          log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2746 #endif
2747          mark_server_socket_tainted(csp);
2748 #ifdef FEATURE_HTTPS_INSPECTION
2749          close_client_and_server_ssl_connections(csp);
2750 #endif
2751          return;
2752       }
2753
2754       /*
2755        * This is the body of the browser's request,
2756        * just read and write it.
2757        *
2758        * Receives data from browser and sends it to server
2759        *
2760        * XXX: Make sure the client doesn't use pipelining
2761        * behind Privoxy's back.
2762        */
2763 #ifdef HAVE_POLL
2764       if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
2765       {
2766          log_error(LOG_LEVEL_CONNECT,
2767             "The client socket %d has become unusable while "
2768             "the server socket %d is still open.",
2769             csp->cfd, csp->server_connection.sfd);
2770          mark_server_socket_tainted(csp);
2771          break;
2772       }
2773
2774       if (poll_fds[0].revents != 0)
2775 #else
2776       if (FD_ISSET(csp->cfd, &rfds))
2777 #endif /* def HAVE_POLL*/
2778       {
2779          int max_bytes_to_read = (int)csp->receive_buffer_size;
2780
2781 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2782          if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
2783          {
2784             if (data_is_available(csp->cfd, 0))
2785             {
2786                /*
2787                 * If the next request is already waiting, we have
2788                 * to stop select()ing the client socket. Otherwise
2789                 * we would always return right away and get nothing
2790                 * else done.
2791                 */
2792                watch_client_socket = 0;
2793                log_error(LOG_LEVEL_CONNECT,
2794                   "Stop watching client socket %d. "
2795                   "There's already another request waiting.",
2796                   csp->cfd);
2797                continue;
2798             }
2799             /*
2800              * If the client socket is set, but there's no data
2801              * available on the socket, the client went fishing
2802              * and continuing talking to the server makes no sense.
2803              */
2804             log_error(LOG_LEVEL_CONNECT,
2805                "The client closed socket %d while "
2806                "the server socket %d is still open.",
2807                csp->cfd, csp->server_connection.sfd);
2808             mark_server_socket_tainted(csp);
2809             break;
2810          }
2811          if (csp->expected_client_content_length != 0)
2812          {
2813             if (csp->expected_client_content_length < csp->receive_buffer_size)
2814             {
2815                max_bytes_to_read = (int)csp->expected_client_content_length;
2816             }
2817             log_error(LOG_LEVEL_CONNECT,
2818                "Waiting for up to %d bytes from the client.",
2819                max_bytes_to_read);
2820          }
2821          assert(max_bytes_to_read <= csp->receive_buffer_size);
2822 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2823
2824 #ifdef FEATURE_HTTPS_INSPECTION
2825          if (client_use_ssl(csp))
2826          {
2827             log_error(LOG_LEVEL_CONNECT, "Breaking with TLS/SSL.");
2828             break;
2829          }
2830          else
2831 #endif /* def FEATURE_HTTPS_INSPECTION */
2832          {
2833             len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
2834
2835             if (len <= 0)
2836             {
2837                /* XXX: not sure if this is necessary. */
2838                mark_server_socket_tainted(csp);
2839                break; /* "game over, man" */
2840             }
2841
2842 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2843             if (csp->expected_client_content_length != 0)
2844             {
2845                assert(len <= max_bytes_to_read);
2846                csp->expected_client_content_length -= (unsigned)len;
2847                log_error(LOG_LEVEL_CONNECT,
2848                   "Expected client content length set to %llu "
2849                   "after reading %ld bytes.",
2850                   csp->expected_client_content_length, len);
2851                if (csp->expected_client_content_length == 0)
2852                {
2853                   log_error(LOG_LEVEL_CONNECT,
2854                      "Done reading from the client.");
2855                   csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
2856                }
2857             }
2858 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2859
2860             if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
2861             {
2862                log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2863                mark_server_socket_tainted(csp);
2864                return;
2865             }
2866          }
2867          continue;
2868       }
2869
2870       /*
2871        * The server wants to talk. It could be the header or the body.
2872        * If `hdr' is null, then it's the header otherwise it's the body.
2873        * FIXME: Does `hdr' really mean `host'? No.
2874        */
2875 #ifdef HAVE_POLL
2876       if (poll_fds[1].revents != 0)
2877 #else
2878       if (FD_ISSET(csp->server_connection.sfd, &rfds))
2879 #endif /* HAVE_POLL */
2880       {
2881 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2882          /*
2883           * If we are buffering content, we don't want to eat up to
2884           * buffer-limit bytes if the client no longer cares about them.
2885           * If we aren't buffering, however, a dead client socket will be
2886           * noticed pretty much right away anyway, so we can reduce the
2887           * overhead by skipping the check.
2888           */
2889          if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
2890          {
2891 #ifdef _WIN32
2892             log_error(LOG_LEVEL_CONNECT,
2893                "The server still wants to talk, but the client may already have hung up on us.");
2894 #else
2895             log_error(LOG_LEVEL_CONNECT,
2896                "The server still wants to talk, but the client hung up on us.");
2897             mark_server_socket_tainted(csp);
2898 #ifdef FEATURE_HTTPS_INSPECTION
2899             close_client_and_server_ssl_connections(csp);
2900 #endif
2901             return;
2902 #endif /* def _WIN32 */
2903          }
2904 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2905
2906 #ifdef FEATURE_HTTPS_INSPECTION
2907          /*
2908           * Reading data from standard or secured connection (HTTP/HTTPS)
2909           */
2910          if (server_use_ssl(csp))
2911          {
2912             len = ssl_recv_data(&(csp->ssl_server_attr),
2913                (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
2914          }
2915          else
2916 #endif
2917          {
2918             len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
2919                (int)csp->receive_buffer_size);
2920          }
2921
2922          if (len < 0)
2923          {
2924             log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2925
2926             if ((http->ssl && (csp->fwd == NULL))
2927 #ifdef FEATURE_HTTPS_INSPECTION
2928                && use_ssl_tunnel
2929 #endif
2930                 )
2931             {
2932                /*
2933                 * Just hang up. We already confirmed the client's CONNECT
2934                 * request with status code 200 and unencrypted content is
2935                 * no longer welcome.
2936                 */
2937                log_error(LOG_LEVEL_ERROR,
2938                   "CONNECT already confirmed. Unable to tell the client about the problem.");
2939                return;
2940             }
2941             else if (byte_count)
2942             {
2943                /*
2944                 * Just hang up. We already transmitted the original headers
2945                 * and parts of the original content and therefore missed the
2946                 * chance to send an error message (without risking data corruption).
2947                 *
2948                 * XXX: we could retry with a fancy range request here.
2949                 */
2950                log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2951                   "Unable to tell the client about the problem.");
2952                mark_server_socket_tainted(csp);
2953 #ifdef FEATURE_HTTPS_INSPECTION
2954                close_client_and_server_ssl_connections(csp);
2955 #endif
2956                return;
2957             }
2958             /*
2959              * XXX: Consider handling the cases above the same.
2960              */
2961             mark_server_socket_tainted(csp);
2962             len = 0;
2963          }
2964
2965 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2966          if (csp->flags & CSP_FLAG_CHUNKED)
2967          {
2968             if ((len >= 5) && !memcmp(csp->receive_buffer+len-5, "0\r\n\r\n", 5))
2969             {
2970                /* XXX: this is a temporary hack */
2971                log_error(LOG_LEVEL_CONNECT,
2972                   "Looks like we reached the end of the last chunk. "
2973                   "We better stop reading.");
2974                csp->expected_content_length = byte_count + (unsigned long long)len;
2975                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2976             }
2977          }
2978          reading_done:
2979 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
2980
2981          /*
2982           * This is guaranteed by allocating with zalloc_or_die()
2983           * and never (intentionally) writing to the last byte.
2984           *
2985           * csp->receive_buffer_size is the size of the part of the
2986           * buffer we intentionally write to, but we actually
2987           * allocated csp->receive_buffer_size+1 bytes so the assertion
2988           * stays within the allocated range.
2989           */
2990          assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
2991
2992          /*
2993           * Add a trailing zero to let be able to use string operations.
2994           * XXX: do we still need this with filter_popups gone?
2995           */
2996          assert(len <= csp->receive_buffer_size);
2997          csp->receive_buffer[len] = '\0';
2998
2999          /*
3000           * Normally, this would indicate that we've read
3001           * as much as the server has sent us and we can
3002           * close the client connection.  However, Microsoft
3003           * in its wisdom has released IIS/5 with a bug that
3004           * prevents it from sending the trailing \r\n in
3005           * a 302 redirect header (and possibly other headers).
3006           * To work around this if we've haven't parsed
3007           * a full header we'll append a trailing \r\n
3008           * and see if this now generates a valid one.
3009           *
3010           * This hack shouldn't have any impacts.  If we've
3011           * already transmitted the header or if this is a
3012           * SSL connection, then we won't bother with this
3013           * hack.  So we only work on partially received
3014           * headers.  If we append a \r\n and this still
3015           * doesn't generate a valid header, then we won't
3016           * transmit anything to the client.
3017           */
3018          if (len == 0)
3019          {
3020
3021             if (server_body || (http->ssl
3022 #ifdef FEATURE_HTTPS_INSPECTION
3023                   && use_ssl_tunnel
3024 #endif
3025                ))
3026             {
3027                /*
3028                 * If we have been buffering up the document,
3029                 * now is the time to apply content modification
3030                 * and send the result to the client.
3031                 */
3032                if (buffer_and_filter_content)
3033                {
3034                   p = execute_content_filters(csp);
3035                   /*
3036                    * If content filtering fails, use the original
3037                    * buffer and length.
3038                    * (see p != NULL ? p : csp->iob->cur below)
3039                    */
3040                   if (NULL == p)
3041                   {
3042                      csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3043                   }
3044 #ifdef FEATURE_COMPRESSION
3045                   else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
3046                      && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
3047                   {
3048                      char *compressed_content = compress_buffer(p,
3049                         (size_t *)&csp->content_length, csp->config->compression_level);
3050                      if (compressed_content != NULL)
3051                      {
3052                         freez(p);
3053                         p = compressed_content;
3054                         csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
3055                      }
3056                   }
3057 #endif
3058
3059                   if (JB_ERR_OK != update_server_headers(csp))
3060                   {
3061                      log_error(LOG_LEVEL_FATAL,
3062                         "Failed to update server headers. after filtering.");
3063                   }
3064
3065                   hdr = list_to_text(csp->headers);
3066                   if (hdr == NULL)
3067                   {
3068                      /* FIXME Should handle error properly */
3069                      log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3070                   }
3071
3072 #ifdef FEATURE_HTTPS_INSPECTION
3073                   /*
3074                    * Sending data with standard or secured connection (HTTP/HTTPS)
3075                    */
3076                   if (client_use_ssl(csp))
3077                   {
3078                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3079                               (const unsigned char *)hdr, strlen(hdr),
3080                               get_write_delay(csp)) < 0)
3081                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3082                               (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
3083                               csp->content_length, get_write_delay(csp)) < 0))
3084                      {
3085                         log_error(LOG_LEVEL_ERROR, "write modified content to "
3086                            "client over TLS/SSL failed");
3087                         freez(hdr);
3088                         freez(p);
3089                         mark_server_socket_tainted(csp);
3090                         close_client_and_server_ssl_connections(csp);
3091                         return;
3092                      }
3093                   }
3094                   else
3095 #endif /* def FEATURE_HTTPS_INSPECTION */
3096                   {
3097                      if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3098                       || write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
3099                          (size_t)csp->content_length, write_delay))
3100                      {
3101                         log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3102                         freez(hdr);
3103                         freez(p);
3104                         mark_server_socket_tainted(csp);
3105                         return;
3106                      }
3107                   }
3108
3109                   freez(hdr);
3110                   freez(p);
3111                }
3112
3113                break; /* "game over, man" */
3114             }
3115
3116             /*
3117              * This is NOT the body, so
3118              * Let's pretend the server just sent us a blank line.
3119              */
3120             snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
3121             len = (int)strlen(csp->receive_buffer);
3122
3123             /*
3124              * Now, let the normal header parsing algorithm below do its
3125              * job.  If it fails, we'll exit instead of continuing.
3126              */
3127
3128             ms_iis5_hack = 1;
3129          }
3130
3131          /*
3132           * If we're in the body of the server document, just write it to
3133           * the client, unless we need to buffer the body for later
3134           * content-filtering.
3135           */
3136          if (server_body || (http->ssl
3137 #ifdef FEATURE_HTTPS_INSPECTION
3138                && use_ssl_tunnel
3139 #endif
3140             ))
3141          {
3142             if (buffer_and_filter_content)
3143             {
3144                /*
3145                 * If there is no memory left for buffering the content, or the buffer limit
3146                 * has been reached, switch to non-filtering mode, i.e. make & write the
3147                 * header, flush the iob and buf, and get out of the way.
3148                 */
3149                if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3150                {
3151                   size_t hdrlen;
3152                   long flushed;
3153
3154                   log_error(LOG_LEVEL_INFO,
3155                      "Flushing header and buffers. Stepping back from filtering.");
3156
3157                   hdr = list_to_text(csp->headers);
3158                   if (hdr == NULL)
3159                   {
3160                      /*
3161                       * Memory is too tight to even generate the header.
3162                       * Send our static "Out-of-memory" page.
3163                       */
3164                      log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3165                      rsp = cgi_error_memory();
3166                      send_crunch_response(csp, rsp);
3167                      mark_server_socket_tainted(csp);
3168 #ifdef FEATURE_HTTPS_INSPECTION
3169                      close_client_and_server_ssl_connections(csp);
3170 #endif
3171                      return;
3172                   }
3173                   hdrlen = strlen(hdr);
3174
3175 #ifdef FEATURE_HTTPS_INSPECTION
3176                   /*
3177                    * Sending data with standard or secured connection (HTTP/HTTPS)
3178                    */
3179                   if (client_use_ssl(csp))
3180                   {
3181                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3182                              (const unsigned char *)hdr, hdrlen, get_write_delay(csp)) < 0)
3183                         || ((flushed = ssl_flush_socket(&(csp->ssl_client_attr),
3184                                 csp->iob)) < 0)
3185                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3186                               (const unsigned char *)csp->receive_buffer, (size_t)len,
3187                               get_write_delay(csp)) < 0))
3188                      {
3189                         log_error(LOG_LEVEL_CONNECT,
3190                            "Flush header and buffers to client failed");
3191                         freez(hdr);
3192                         mark_server_socket_tainted(csp);
3193                         close_client_and_server_ssl_connections(csp);
3194                         return;
3195                      }
3196                   }
3197                   else
3198 #endif /* def FEATURE_HTTPS_INSPECTION */
3199                   {
3200                      if (write_socket_delayed(csp->cfd, hdr, hdrlen, write_delay)
3201                       || ((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3202                       || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3203                             write_delay))
3204                      {
3205                         log_error(LOG_LEVEL_CONNECT,
3206                            "Flush header and buffers to client failed: %E");
3207                         freez(hdr);
3208                         mark_server_socket_tainted(csp);
3209                         return;
3210                      }
3211                   }
3212
3213                   /*
3214                    * Reset the byte_count to the amount of bytes
3215                    * we just flushed. len will be added a few lines below,
3216                    * hdrlen doesn't matter for LOG_LEVEL_CLF.
3217                    */
3218                   byte_count = (unsigned long long)flushed;
3219                   freez(hdr);
3220                   buffer_and_filter_content = 0;
3221                   server_body = 1;
3222                }
3223             }
3224             else
3225             {
3226 #ifdef FEATURE_HTTPS_INSPECTION
3227                /*
3228                 * Sending data with standard or secured connection (HTTP/HTTPS)
3229                 */
3230                if (client_use_ssl(csp))
3231                {
3232                   ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3233                      (const unsigned char *)csp->receive_buffer, (size_t)len,
3234                      get_write_delay(csp));
3235                   if (ret < 0)
3236                   {
3237                      log_error(LOG_LEVEL_ERROR,
3238                         "Sending data to client failed");
3239                      mark_server_socket_tainted(csp);
3240                      close_client_and_server_ssl_connections(csp);
3241                      return;
3242                   }
3243                }
3244                else
3245 #endif /* def FEATURE_HTTPS_INSPECTION */
3246                {
3247                   if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3248                         (size_t)len, write_delay))
3249                   {
3250                      log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3251                      mark_server_socket_tainted(csp);
3252                      return;
3253                   }
3254                }
3255             }
3256             byte_count += (unsigned long long)len;
3257             continue;
3258          }
3259          else
3260          {
3261             /*
3262              * We're still looking for the end of the server's header.
3263              * Buffer up the data we just read.  If that fails, there's
3264              * little we can do but send our static out-of-memory page.
3265              */
3266             if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3267             {
3268                log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3269                rsp = cgi_error_memory();
3270                send_crunch_response(csp, rsp);
3271                mark_server_socket_tainted(csp);
3272 #ifdef FEATURE_HTTPS_INSPECTION
3273                close_client_and_server_ssl_connections(csp);
3274 #endif
3275                return;
3276             }
3277
3278             /* Convert iob into something sed() can digest */
3279             if (JB_ERR_PARSE == get_server_headers(csp))
3280             {
3281                if (ms_iis5_hack)
3282                {
3283                   /*
3284                    * Well, we tried our MS IIS/5 hack and it didn't work.
3285                    * The header is incomplete and there isn't anything
3286                    * we can do about it.
3287                    */
3288                   log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3289                      "Applying the MS IIS5 hack didn't help.");
3290                   log_error(LOG_LEVEL_CLF,
3291                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3292 #ifdef FEATURE_HTTPS_INSPECTION
3293                   /*
3294                    * Sending data with standard or secured connection (HTTP/HTTPS)
3295                    */
3296                   if (client_use_ssl(csp))
3297                   {
3298                      ssl_send_data_delayed(&(csp->ssl_client_attr),
3299                         (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3300                         strlen(INVALID_SERVER_HEADERS_RESPONSE), get_write_delay(csp));
3301                   }
3302                   else
3303 #endif /* def FEATURE_HTTPS_INSPECTION */
3304                   {
3305                      write_socket_delayed(csp->cfd,
3306                         INVALID_SERVER_HEADERS_RESPONSE,
3307                         strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3308                   }
3309                   mark_server_socket_tainted(csp);
3310 #ifdef FEATURE_HTTPS_INSPECTION
3311                   close_client_and_server_ssl_connections(csp);
3312 #endif
3313                   return;
3314                }
3315                else
3316                {
3317                   /*
3318                    * Since we have to wait for more from the server before
3319                    * we can parse the headers we just continue here.
3320                    */
3321                   log_error(LOG_LEVEL_CONNECT,
3322                      "Continuing buffering server headers from socket %d. "
3323                      "Bytes most recently read: %ld.", csp->cfd, len);
3324                   continue;
3325                }
3326             }
3327             else
3328             {
3329                /*
3330                 * Account for the content bytes we
3331                 * might have gotten with the headers.
3332                 */
3333                assert(csp->iob->eod >= csp->iob->cur);
3334                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3335             }
3336
3337             /* Did we actually get anything? */
3338             if (NULL == csp->headers->first)
3339             {
3340                if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
3341                {
3342                   log_error(LOG_LEVEL_ERROR,
3343                      "No server or forwarder response received on socket %d. "
3344                      "Closing client socket %d without sending data.",
3345                      csp->server_connection.sfd, csp->cfd);
3346                   log_error(LOG_LEVEL_CLF,
3347                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3348                }
3349                else
3350                {
3351                   log_error(LOG_LEVEL_ERROR,
3352                      "No server or forwarder response received on socket %d.",
3353                      csp->server_connection.sfd);
3354                   send_crunch_response(csp, error_response(csp, "no-server-data"));
3355                }
3356                free_http_request(http);
3357                mark_server_socket_tainted(csp);
3358 #ifdef FEATURE_HTTPS_INSPECTION
3359                close_client_and_server_ssl_connections(csp);
3360 #endif
3361                return;
3362             }
3363
3364             if (!csp->headers->first->str)
3365             {
3366                log_error(LOG_LEVEL_ERROR, "header search: csp->headers->first->str == NULL, assert will be called");
3367             }
3368             assert(csp->headers->first->str);
3369
3370             if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3371                 strncmpic(csp->headers->first->str, "ICY", 3))
3372             {
3373                /*
3374                 * It doesn't look like a HTTP (or Shoutcast) response:
3375                 * tell the client and log the problem.
3376                 */
3377                if (strlen(csp->headers->first->str) > 30)
3378                {
3379                   csp->headers->first->str[30] = '\0';
3380                }
3381                log_error(LOG_LEVEL_ERROR,
3382                   "Invalid server or forwarder response. Starts with: %s",
3383                   csp->headers->first->str);
3384                log_error(LOG_LEVEL_CLF,
3385                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3386 #ifdef FEATURE_HTTPS_INSPECTION
3387                /*
3388                 * Sending data with standard or secured connection (HTTP/HTTPS)
3389                 */
3390                if (client_use_ssl(csp))
3391                {
3392                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3393                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3394                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3395                      get_write_delay(csp));
3396                }
3397                else
3398 #endif /* def FEATURE_HTTPS_INSPECTION */
3399                {
3400                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3401                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3402                }
3403                free_http_request(http);
3404                mark_server_socket_tainted(csp);
3405 #ifdef FEATURE_HTTPS_INSPECTION
3406                close_client_and_server_ssl_connections(csp);
3407 #endif
3408                return;
3409             }
3410
3411             /*
3412              * We have now received the entire server header,
3413              * filter it and send the result to the client
3414              */
3415             if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3416             {
3417                log_error(LOG_LEVEL_CLF,
3418                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3419 #ifdef FEATURE_HTTPS_INSPECTION
3420                /*
3421                 * Sending data with standard or secured connection (HTTP/HTTPS)
3422                 */
3423                if (client_use_ssl(csp))
3424                {
3425                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3426                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3427                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3428                      get_write_delay(csp));
3429                }
3430                else
3431 #endif
3432                {
3433                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3434                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3435                }
3436                free_http_request(http);
3437                mark_server_socket_tainted(csp);
3438 #ifdef FEATURE_HTTPS_INSPECTION
3439                close_client_and_server_ssl_connections(csp);
3440 #endif
3441                return;
3442             }
3443             hdr = list_to_text(csp->headers);
3444             if (hdr == NULL)
3445             {
3446                /* FIXME Should handle error properly */
3447                log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3448             }
3449
3450             if ((csp->flags & CSP_FLAG_CHUNKED)
3451                && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3452                && ((csp->iob->eod - csp->iob->cur) >= 5)
3453                && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3454             {
3455                log_error(LOG_LEVEL_CONNECT,
3456                   "Looks like we got the last chunk together with "
3457                   "the server headers. We better stop reading.");
3458                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3459                csp->expected_content_length = byte_count;
3460                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3461             }
3462
3463             csp->server_connection.response_received = time(NULL);
3464
3465             if (crunch_response_triggered(csp, crunchers_light))
3466             {
3467                /*
3468                 * One of the tags created by a server-header
3469                 * tagger triggered a crunch. We already
3470                 * delivered the crunch response to the client
3471                 * and are done here after cleaning up.
3472                 */
3473                freez(hdr);
3474                mark_server_socket_tainted(csp);
3475 #ifdef FEATURE_HTTPS_INSPECTION
3476                close_client_and_server_ssl_connections(csp);
3477 #endif
3478                return;
3479             }
3480
3481             /* Buffer and pcrs filter this if appropriate. */
3482             buffer_and_filter_content = content_requires_filtering(csp);
3483
3484             if (!buffer_and_filter_content)
3485             {
3486                /*
3487                 * Write the server's (modified) header to
3488                 * the client (along with anything else that
3489                 * may be in the buffer). Use standard or secured
3490                 * connection.
3491                 */
3492 #ifdef FEATURE_HTTPS_INSPECTION
3493                if (client_use_ssl(csp))
3494                {
3495                   if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3496                           (const unsigned char *)hdr, strlen(hdr),
3497                           get_write_delay(csp)) < 0)
3498                      || (len = ssl_flush_socket(&(csp->ssl_client_attr),
3499                             csp->iob) < 0))
3500                   {
3501                      log_error(LOG_LEVEL_CONNECT, "Write header to client failed");
3502
3503                      /*
3504                       * The write failed, so don't bother mentioning it
3505                       * to the client... it probably can't hear us anyway.
3506                       */
3507                      freez(hdr);
3508                      mark_server_socket_tainted(csp);
3509 #ifdef FEATURE_HTTPS_INSPECTION
3510                      close_client_and_server_ssl_connections(csp);
3511 #endif
3512                      return;
3513                   }
3514                }
3515                else
3516 #endif /* def FEATURE_HTTPS_INSPECTION */
3517                {
3518                   if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3519                      || ((len = flush_iob(csp->cfd, csp->iob, write_delay)) < 0))
3520                   {
3521                      log_error(LOG_LEVEL_ERROR,
3522                         "write header to client failed");
3523                      /*
3524                       * The write failed, so don't bother mentioning it
3525                       * to the client... it probably can't hear us anyway.
3526                       */
3527                      freez(hdr);
3528                      mark_server_socket_tainted(csp);
3529                      return;
3530                   }
3531                }
3532                                 }
3533
3534             /* we're finished with the server's header */
3535
3536             freez(hdr);
3537             server_body = 1;
3538
3539             /*
3540              * If this was a MS IIS/5 hack then it means the server
3541              * has already closed the connection. Nothing more to read.
3542              * Time to bail.
3543              */
3544             if (ms_iis5_hack)
3545             {
3546                log_error(LOG_LEVEL_ERROR,
3547                   "Closed server connection detected. "
3548                   "Applying the MS IIS5 hack didn't help.");
3549                log_error(LOG_LEVEL_CLF,
3550                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3551 #ifdef FEATURE_HTTPS_INSPECTION
3552                /*
3553                 * Sending data with standard or secured connection (HTTP/HTTPS)
3554                 */
3555                if (client_use_ssl(csp))
3556                {
3557                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3558                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3559                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3560                      get_write_delay(csp));
3561                }
3562                else
3563 #endif /* def FEATURE_HTTPS_INSPECTION */
3564                {
3565                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3566                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3567                }
3568                mark_server_socket_tainted(csp);
3569 #ifdef FEATURE_HTTPS_INSPECTION
3570                close_client_and_server_ssl_connections(csp);
3571 #endif
3572                return;
3573             }
3574          }
3575          continue;
3576       }
3577       mark_server_socket_tainted(csp);
3578 #ifdef FEATURE_HTTPS_INSPECTION
3579       close_client_and_server_ssl_connections(csp);
3580 #endif
3581       return; /* huh? we should never get here */
3582    }
3583
3584    if (csp->content_length == 0)
3585    {
3586       /*
3587        * If Privoxy didn't recalculate the Content-Length,
3588        * byte_count is still correct.
3589        */
3590       csp->content_length = byte_count;
3591    }
3592
3593 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3594    if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3595       && (csp->expected_content_length != byte_count))
3596    {
3597       log_error(LOG_LEVEL_CONNECT,
3598          "Received %llu bytes while expecting %llu.",
3599          byte_count, csp->expected_content_length);
3600       mark_server_socket_tainted(csp);
3601    }
3602 #endif
3603
3604 #ifdef FEATURE_HTTPS_INSPECTION
3605    if (client_use_ssl(csp))
3606    {
3607       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" 200 %llu",
3608          csp->ip_addr_str, http->gpc, http->hostport, http->path,
3609          http->version, csp->content_length);
3610    }
3611    else
3612 #endif
3613    {
3614       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
3615          csp->ip_addr_str, http->ocmd, csp->content_length);
3616    }
3617    csp->server_connection.timestamp = time(NULL);
3618 }
3619
3620
3621 /*********************************************************************
3622  *
3623  * Function    :  chat
3624  *
3625  * Description :  Once a connection from the client has been accepted,
3626  *                this function is called (via serve()) to handle the
3627  *                main business of the communication.  This function
3628  *                returns after dealing with a single request. It can
3629  *                be called multiple times with the same client socket
3630  *                if the client is keeping the connection alive.
3631  *
3632  *                The decision whether or not a client connection will
3633  *                be kept alive is up to the caller which also must
3634  *                close the client socket when done.
3635  *
3636  *                FIXME: chat is nearly thousand lines long.
3637  *                Ridiculous.
3638  *
3639  * Parameters  :
3640  *          1  :  csp = Current client state (buffers, headers, etc...)
3641  *
3642  * Returns     :  Nothing.
3643  *
3644  *********************************************************************/
3645 static void chat(struct client_state *csp)
3646 {
3647    const struct forward_spec *fwd;
3648    struct http_request *http;
3649    /* Skeleton for HTTP response, if we should intercept the request */
3650    struct http_response *rsp;
3651 #ifdef FEATURE_HTTPS_INSPECTION
3652    int use_ssl_tunnel = 0;
3653 #endif
3654
3655    http = csp->http;
3656
3657    if (receive_client_request(csp) != JB_ERR_OK)
3658    {
3659       return;
3660    }
3661    if (parse_client_request(csp) != JB_ERR_OK)
3662    {
3663       return;
3664    }
3665
3666    /* decide how to route the HTTP request */
3667    fwd = forward_url(csp, http);
3668
3669 #ifdef FEATURE_HTTPS_INSPECTION
3670    /*
3671     * Setting flags to use old solution with SSL tunnel and to disable
3672     * certificate verification.
3673     */
3674    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION)
3675       && !cgi_page_requested(csp->http->host))
3676    {
3677       use_ssl_tunnel = 1;
3678    }
3679
3680    if (http->ssl && csp->action->flags & ACTION_IGNORE_CERTIFICATE_ERRORS)
3681    {
3682       csp->dont_verify_certificate = 1;
3683    }
3684 #endif
3685
3686    /*
3687     * build the http request to send to the server
3688     * we have to do one of the following:
3689     *
3690     * create =    use the original HTTP request to create a new
3691     *             HTTP request that has either the path component
3692     *             without the http://domainspec (w/path) or the
3693     *             full orininal URL (w/url)
3694     *             Note that the path and/or the HTTP version may
3695     *             have been altered by now.
3696     *
3697     * SSL proxy = Open a socket to the host:port of the server
3698     *             and create TLS/SSL connection with server and
3699     *             with client. Then behave like mediator between
3700     *             client and server over TLS/SSL.
3701     *
3702     * SSL proxy = Pass the request unchanged if forwarding a CONNECT
3703     *    with     request to a parent proxy. Note that we'll be sending
3704     * forwarding  the CFAIL message ourselves if connecting to the parent
3705     *             fails, but we won't send a CSUCCEED message if it works,
3706     *             since that would result in a double message (ours and the
3707     *             parent's). After sending the request to the parent, we
3708     *             must parse answer and send it to client. If connection
3709     *             with server is established, we do TLS/SSL proxy. Otherwise
3710     *             we send parent response to client and close connections.
3711     *
3712     * here's the matrix:
3713     *                        SSL
3714     *                    0        1
3715     *                +--------+--------+
3716     *                |        |        |
3717     *             0  | create |   SSL  |
3718     *                | w/path |  proxy |
3719     *  Forwarding    +--------+--------+
3720     *                |        |   SSL  |
3721     *             1  | create |  proxy |
3722     *                | w/url  |+forward|
3723     *                +--------+--------+
3724     *
3725     */
3726
3727 #ifdef FEATURE_HTTPS_INSPECTION
3728    /*
3729     * Presetting SSL client and server flags
3730     */
3731    if (http->ssl && !use_ssl_tunnel)
3732    {
3733       http->client_ssl = 1;
3734       http->server_ssl = 1;
3735    }
3736    else
3737    {
3738       http->client_ssl = 0;
3739       http->server_ssl = 0;
3740    }
3741 #endif
3742
3743 #ifdef FEATURE_HTTPS_INSPECTION
3744    /*
3745     * Log the request unless we're https inspecting
3746     * in which case we don't have the path yet and
3747     * will log the request later.
3748     */
3749    if (!client_use_ssl(csp))
3750 #endif
3751    {
3752       log_error(LOG_LEVEL_REQUEST, "%s%s", http->hostport, http->path);
3753    }
3754
3755    if (http->ssl && connect_port_is_forbidden(csp))
3756    {
3757       const char *acceptable_connect_ports =
3758          csp->action->string[ACTION_STRING_LIMIT_CONNECT];
3759       assert(NULL != acceptable_connect_ports);
3760       log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
3761          "limit-connect{%s} doesn't allow CONNECT requests to %s",
3762          csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport);
3763       csp->action->flags |= ACTION_BLOCK;
3764       http->ssl = 0;
3765 #ifdef FEATURE_HTTPS_INSPECTION
3766       http->client_ssl = 0;
3767       http->server_ssl = 0;
3768 #endif
3769    }
3770
3771
3772    freez(csp->headers->first->str);
3773    build_request_line(csp, fwd, &csp->headers->first->str);
3774
3775    /*
3776     * We have a request. Check if one of the crunchers wants it
3777     * unless the client wants to use TLS/SSL in which case we
3778     * haven't setup the TLS context yet and will send the crunch
3779     * response later.
3780     */
3781    if (
3782 #ifdef FEATURE_HTTPS_INSPECTION
3783        !client_use_ssl(csp) &&
3784 #endif
3785        crunch_response_triggered(csp, crunchers_all))
3786    {
3787       /*
3788        * Yes. The client got the crunch response and we're done here.
3789        */
3790       return;
3791    }
3792
3793    log_applied_actions(csp->action);
3794    if (fwd->forward_host)
3795    {
3796       log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
3797          fwd->forward_host, fwd->forward_port, http->hostport);
3798    }
3799    else
3800    {
3801       log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
3802    }
3803
3804    /* here we connect to the server, gateway, or the forwarder */
3805
3806 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3807    if ((csp->server_connection.sfd != JB_INVALID_SOCKET)
3808       && socket_is_still_alive(csp->server_connection.sfd)
3809       && connection_destination_matches(&csp->server_connection, http, fwd))
3810    {
3811       log_error(LOG_LEVEL_CONNECT,
3812          "Reusing server socket %d connected to %s. Total requests: %u.",
3813          csp->server_connection.sfd, csp->server_connection.host,
3814          csp->server_connection.requests_sent_total);
3815    }
3816    else
3817    {
3818       if (csp->server_connection.sfd != JB_INVALID_SOCKET)
3819       {
3820 #ifdef FEATURE_CONNECTION_SHARING
3821          if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING
3822 #ifdef FEATURE_HTTPS_INSPECTION
3823             && !server_use_ssl(csp)
3824 #endif
3825             )
3826          {
3827             remember_connection(&csp->server_connection);
3828          }
3829          else
3830 #endif /* def FEATURE_CONNECTION_SHARING */
3831          {
3832             log_error(LOG_LEVEL_CONNECT,
3833                "Closing server socket %d connected to %s. Total requests: %u.",
3834                csp->server_connection.sfd, csp->server_connection.host,
3835                csp->server_connection.requests_sent_total);
3836             close_socket(csp->server_connection.sfd);
3837          }
3838          mark_connection_closed(&csp->server_connection);
3839       }
3840 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3841 #ifdef FEATURE_HTTPS_INSPECTION
3842       if (http->ssl && !use_ssl_tunnel)
3843       {
3844          int ret;
3845          /*
3846           * Creating a SSL proxy.
3847           *
3848           * By sending the CSUCCEED message we're lying to the client as
3849           * the connection hasn't actually been established yet. We don't
3850           * establish the connection until we have seen and parsed the
3851           * encrypted client headers.
3852           */
3853          if (write_socket_delayed(csp->cfd, CSUCCEED,
3854                strlen(CSUCCEED), get_write_delay(csp)) != 0)
3855          {
3856             log_error(LOG_LEVEL_ERROR, "Sending SUCCEED to client failed");
3857             return;
3858          }
3859
3860          ret = create_client_ssl_connection(csp);
3861          if (ret != 0)
3862          {
3863             log_error(LOG_LEVEL_ERROR,
3864                "Failed to open a secure connection with the client");
3865             return;
3866          }
3867          if (JB_ERR_OK != process_encrypted_request(csp))
3868          {
3869             close_client_ssl_connection(csp);
3870             return;
3871          }
3872          /*
3873           * We have an encrypted request. Check if one of the crunchers now
3874           * wants it (for example because the previously invisible path was
3875           * required to match).
3876           */
3877          if (crunch_response_triggered(csp, crunchers_all))
3878          {
3879             /*
3880              * Yes. The client got the crunch response and we're done here.
3881              */
3882             return;
3883          }
3884       }
3885 #endif
3886       /*
3887        * Connecting to destination server
3888        */
3889       csp->server_connection.sfd = forwarded_connect(fwd, http, csp);
3890
3891       if (csp->server_connection.sfd == JB_INVALID_SOCKET)
3892       {
3893          if (fwd->type != SOCKS_NONE)
3894          {
3895             /* Socks error. */
3896             rsp = error_response(csp, "forwarding-failed");
3897          }
3898          else if (errno == EINVAL)
3899          {
3900             rsp = error_response(csp, "no-such-domain");
3901          }
3902          else
3903          {
3904             rsp = error_response(csp, "connect-failed");
3905          }
3906
3907          /* Write the answer to the client */
3908          if (rsp != NULL)
3909          {
3910             send_crunch_response(csp, rsp);
3911          }
3912
3913          /*
3914           * Temporary workaround to prevent already-read client
3915           * bodies from being parsed as new requests. For now we
3916           * err on the safe side and throw all the following
3917           * requests under the bus, even if no client body has been
3918           * buffered. A compliant client will repeat the dropped
3919           * requests on an untainted connection.
3920           *
3921           * The proper fix is to discard the no longer needed
3922           * client body in the buffer (if there is one) and to
3923           * continue parsing the bytes that follow.
3924           */
3925 #ifdef FEATURE_HTTPS_INSPECTION
3926          close_client_ssl_connection(csp);
3927 #endif
3928          drain_and_close_socket(csp->cfd);
3929          csp->cfd = JB_INVALID_SOCKET;
3930
3931          return;
3932       }
3933
3934 #ifdef FEATURE_HTTPS_INSPECTION
3935       /*
3936        * Creating TLS/SSL connections with destination server or parent
3937        * proxy. If forwarding is enabled, we must send client request to
3938        * parent proxy and receive, parse and resend parent proxy answer.
3939        */
3940       if (http->ssl && !use_ssl_tunnel)
3941       {
3942          if (fwd->forward_host != NULL)
3943          {
3944             char server_response[BUFFER_SIZE];
3945             int ret = 0;
3946             int len = 0;
3947             char *hdr = list_to_text(csp->headers);
3948             memset(server_response, 0, sizeof(server_response));
3949
3950             if (hdr == NULL)
3951             {
3952                log_error(LOG_LEVEL_FATAL,
3953                   "Out of memory parsing client header");
3954             }
3955             list_remove_all(csp->headers);
3956
3957             /*
3958              * Sending client's CONNECT request to the parent proxy
3959              */
3960             ret = write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
3961
3962             freez(hdr);
3963
3964             if (ret != 0)
3965             {
3966                log_error(LOG_LEVEL_CONNECT,
3967                   "Sending request headers to: %s failed", http->hostport);
3968                mark_server_socket_tainted(csp);
3969                close_client_ssl_connection(csp);
3970                return;
3971             }
3972
3973             /* Waiting for parent proxy server response */
3974             len = read_socket(csp->server_connection.sfd, server_response,
3975                sizeof(server_response)-1);
3976
3977             if (len <= 0)
3978             {
3979                log_error(LOG_LEVEL_ERROR, "No response from parent proxy "
3980                   "server on socket %d.", csp->server_connection.sfd);
3981
3982                rsp = error_response(csp, "no-server-data");
3983                if (rsp)
3984                {
3985                   send_crunch_response(csp, rsp);
3986                }
3987                mark_server_socket_tainted(csp);
3988                close_client_ssl_connection(csp);
3989                return;
3990             }
3991
3992             /*
3993              * Test if the connection to the destination server was
3994              * established successfully by the parent proxy.
3995              */
3996             if (!tunnel_established_successfully(server_response, (unsigned int)len))
3997             {
3998                log_error(LOG_LEVEL_ERROR,
3999                   "The forwarder %s failed to establish a connection with %s",
4000                   fwd->forward_host, http->host);
4001                rsp = error_response(csp, "connect-failed");
4002                if (rsp)
4003                {
4004                   send_crunch_response(csp, rsp);
4005                }
4006                mark_server_socket_tainted(csp);
4007                close_client_ssl_connection(csp);
4008                return;
4009             }
4010          } /* -END- if (fwd->forward_host != NULL) */
4011
4012          /*
4013           * We can now create the TLS/SSL connection with the destination server.
4014           */
4015          int ret = create_server_ssl_connection(csp);
4016          if (ret != 0)
4017          {
4018             if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4019                 csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4020             {
4021                /*
4022                 * If the server certificate is invalid, we must inform
4023                 * the client and then close connection to the client.
4024                 */
4025                ssl_send_certificate_error(csp);
4026                close_client_and_server_ssl_connections(csp);
4027                return;
4028             }
4029             if (csp->server_cert_verification_result == SSL_CERT_NOT_VERIFIED
4030              || csp->server_cert_verification_result == SSL_CERT_VALID)
4031             {
4032                /*
4033                 * The TLS/SSL connection wasn't created but an invalid
4034                 * certificate wasn't detected. Report it as connection
4035                 * failure.
4036                 */
4037                rsp = error_response(csp, "connect-failed");
4038                if (rsp)
4039                {
4040                   send_crunch_response(csp, rsp);
4041                }
4042                close_client_and_server_ssl_connections(csp);
4043                return;
4044             }
4045          }
4046       }/* -END- if (http->ssl) */
4047 #endif /* def FEATURE_HTTPS_INSPECTION */
4048
4049 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4050       save_connection_destination(csp->server_connection.sfd,
4051          http, fwd, &csp->server_connection);
4052       csp->server_connection.keep_alive_timeout =
4053          (unsigned)csp->config->keep_alive_timeout;
4054    }
4055 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4056
4057    csp->server_connection.requests_sent_total++;
4058
4059    if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first))
4060    {
4061       /* Client headers have been sent optimistically */
4062       assert(csp->headers->last == NULL);
4063    }
4064    else if (http->ssl == 0 || (fwd->forward_host
4065 #ifdef FEATURE_HTTPS_INSPECTION
4066          && use_ssl_tunnel
4067 #endif
4068            ))
4069    {
4070       if (send_http_request(csp))
4071       {
4072          rsp = error_response(csp, "connect-failed");
4073          if (rsp)
4074          {
4075             send_crunch_response(csp, rsp);
4076          }
4077          return;
4078       }
4079    }
4080    else
4081    {
4082       /*
4083        * Using old solution with SSL tunnel or new solution with SSL proxy
4084        */
4085       list_remove_all(csp->headers);
4086 #ifdef FEATURE_HTTPS_INSPECTION
4087       if (use_ssl_tunnel)
4088 #endif
4089       {
4090          /*
4091          * We're running an SSL tunnel and we're not forwarding,
4092          * so just ditch the client headers, send the "connect succeeded"
4093          * message to the client, flush the rest, and get out of the way.
4094          */
4095          if (write_socket_delayed(csp->cfd, CSUCCEED,
4096                strlen(CSUCCEED), get_write_delay(csp)))
4097          {
4098             return;
4099          }
4100       }
4101 #ifdef FEATURE_HTTPS_INSPECTION
4102       else
4103       {
4104          /*
4105           * If server certificate is invalid, we must inform client and then
4106           * close connection with client.
4107           */
4108          if (csp->server_cert_verification_result != SSL_CERT_VALID)
4109          {
4110             ssl_send_certificate_error(csp);
4111             close_client_and_server_ssl_connections(csp);
4112             return;
4113          }
4114          if (send_https_request(csp))
4115          {
4116             rsp = error_response(csp, "connect-failed");
4117             if (rsp)
4118             {
4119                send_crunch_response(csp, rsp);
4120             }
4121             close_client_and_server_ssl_connections(csp);
4122             return;
4123          }
4124       }
4125 #endif /* def FEATURE_HTTPS_INSPECTION */
4126       clear_iob(csp->client_iob);
4127    }/* -END- else ... if (http->ssl == 1) */
4128
4129    log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
4130
4131    /* XXX: should the time start earlier for optimistically sent data? */
4132    csp->server_connection.request_sent = time(NULL);
4133
4134    handle_established_connection(csp);
4135    freez(csp->receive_buffer);
4136 }
4137
4138
4139 #ifdef FUZZ
4140 /*********************************************************************
4141  *
4142  * Function    :  fuzz_server_response
4143  *
4144  * Description :  Treat the input as a whole server response.
4145  *
4146  * Parameters  :
4147  *          1  :  csp = Current client state (buffers, headers, etc...)
4148  *          2  :  fuzz_input_file = File to read the input from.
4149  *
4150  * Returns     :  0
4151  *
4152  *********************************************************************/
4153 extern int fuzz_server_response(struct client_state *csp, char *fuzz_input_file)
4154 {
4155    static struct forward_spec fwd; /* Zero'd due to being static */
4156    csp->cfd = 0;
4157
4158    if (strcmp(fuzz_input_file, "-") == 0)
4159    {
4160       /* XXX: Doesn't work yet. */
4161       csp->server_connection.sfd = 0;
4162    }
4163    else
4164    {
4165       csp->server_connection.sfd = open(fuzz_input_file, O_RDONLY);
4166       if (csp->server_connection.sfd == -1)
4167       {
4168          log_error(LOG_LEVEL_FATAL, "Failed to open %s: %E",
4169             fuzz_input_file);
4170       }
4171    }
4172    csp->fwd = &fwd;
4173    csp->content_type |= CT_GIF;
4174    csp->action->flags |= ACTION_DEANIMATE;
4175    csp->action->string[ACTION_STRING_DEANIMATE] = "last";
4176
4177    csp->http->path = strdup_or_die("/");
4178    csp->http->host = strdup_or_die("fuzz.example.org");
4179    csp->http->hostport = strdup_or_die("fuzz.example.org:80");
4180    /* Prevent client socket monitoring */
4181    csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4182    csp->flags |= CSP_FLAG_CHUNKED;
4183
4184    csp->config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
4185    csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4186
4187    csp->content_type |= CT_DECLARED|CT_GIF;
4188
4189    csp->config->socket_timeout = 0;
4190
4191    cgi_init_error_messages();
4192
4193    handle_established_connection(csp);
4194    freez(csp->receive_buffer);
4195
4196    return 0;
4197 }
4198 #endif
4199
4200
4201 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4202 /*********************************************************************
4203  *
4204  * Function    :  prepare_csp_for_next_request
4205  *
4206  * Description :  Put the csp in a mostly vergin state.
4207  *
4208  * Parameters  :
4209  *          1  :  csp = Current client state (buffers, headers, etc...)
4210  *
4211  * Returns     :  N/A
4212  *
4213  *********************************************************************/
4214 static void prepare_csp_for_next_request(struct client_state *csp)
4215 {
4216    csp->content_type = 0;
4217    csp->content_length = 0;
4218    csp->expected_content_length = 0;
4219    csp->expected_client_content_length = 0;
4220    list_remove_all(csp->headers);
4221    clear_iob(csp->iob);
4222    freez(csp->error_message);
4223    free_http_request(csp->http);
4224    destroy_list(csp->headers);
4225 #ifdef FEATURE_HTTPS_INSPECTION
4226    destroy_list(csp->https_headers);
4227 #endif
4228    destroy_list(csp->tags);
4229 #ifdef FEATURE_CLIENT_TAGS
4230    destroy_list(csp->client_tags);
4231    freez(csp->client_address);
4232 #endif
4233    free_current_action(csp->action);
4234    if (NULL != csp->fwd)
4235    {
4236       unload_forward_spec(csp->fwd);
4237       csp->fwd = NULL;
4238    }
4239    /* XXX: Store per-connection flags someplace else. */
4240    csp->flags = (CSP_FLAG_ACTIVE | CSP_FLAG_REUSED_CLIENT_CONNECTION);
4241 #ifdef FEATURE_TOGGLE
4242    if (global_toggle_state)
4243 #endif /* def FEATURE_TOGGLE */
4244    {
4245       csp->flags |= CSP_FLAG_TOGGLED_ON;
4246    }
4247
4248    if (csp->client_iob->eod > csp->client_iob->cur)
4249    {
4250       long bytes_to_shift = csp->client_iob->cur - csp->client_iob->buf;
4251       size_t data_length  = (size_t)(csp->client_iob->eod - csp->client_iob->cur);
4252
4253       assert(bytes_to_shift > 0);
4254       assert(data_length > 0);
4255
4256       log_error(LOG_LEVEL_CONNECT, "Shifting %lu pipelined bytes by %ld bytes",
4257          data_length, bytes_to_shift);
4258       memmove(csp->client_iob->buf, csp->client_iob->cur, data_length);
4259       csp->client_iob->cur = csp->client_iob->buf;
4260       assert(csp->client_iob->eod == csp->client_iob->buf + bytes_to_shift + data_length);
4261       csp->client_iob->eod = csp->client_iob->buf + data_length;
4262       memset(csp->client_iob->eod, '\0', (size_t)bytes_to_shift);
4263
4264       csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4265    }
4266    else
4267    {
4268       /*
4269        * We mainly care about resetting client_iob->cur so we don't
4270        * waste buffer space at the beginning and don't mess up the
4271        * request restoration done by cgi_show_request().
4272        *
4273        * Freeing the buffer itself isn't technically necessary,
4274        * but makes debugging more convenient.
4275        */
4276       clear_iob(csp->client_iob);
4277    }
4278 }
4279 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4280
4281
4282 /*********************************************************************
4283  *
4284  * Function    :  serve
4285  *
4286  * Description :  This is little more than chat.  We only "serve" to
4287  *                to close (or remember) any socket that chat may have
4288  *                opened.
4289  *
4290  * Parameters  :
4291  *          1  :  csp = Current client state (buffers, headers, etc...)
4292  *
4293  * Returns     :  N/A
4294  *
4295  *********************************************************************/
4296 static void serve(struct client_state *csp)
4297 {
4298    int config_file_change_detected = 0; /* Only used for debugging */
4299 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4300 #ifdef FEATURE_CONNECTION_SHARING
4301    static int monitor_thread_running = 0;
4302 #endif /* def FEATURE_CONNECTION_SHARING */
4303    int continue_chatting = 0;
4304
4305    log_error(LOG_LEVEL_CONNECT, "Accepted connection from %s on socket %d",
4306       csp->ip_addr_str, csp->cfd);
4307
4308    do
4309    {
4310       unsigned int latency;
4311
4312 #ifdef FEATURE_HTTPS_INSPECTION
4313       if (continue_chatting && client_use_ssl(csp))
4314       {
4315          continue_https_chat(csp);
4316       }
4317       else
4318 #endif
4319       {
4320          chat(csp);
4321       }
4322
4323       /*
4324        * If the request has been crunched,
4325        * the calculated latency is zero.
4326        */
4327       latency = (unsigned)(csp->server_connection.response_received -
4328          csp->server_connection.request_sent) / 2;
4329
4330       if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4331          && (csp->flags & CSP_FLAG_CRUNCHED)
4332          && (csp->expected_client_content_length != 0))
4333       {
4334          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
4335          log_error(LOG_LEVEL_CONNECT,
4336             "Tainting client socket %d due to unread data.", csp->cfd);
4337       }
4338
4339       continue_chatting = (csp->config->feature_flags
4340          & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
4341          && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4342          && (csp->cfd != JB_INVALID_SOCKET)
4343          && (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4344          && ((csp->flags & CSP_FLAG_SERVER_CONTENT_LENGTH_SET)
4345             || (csp->flags & CSP_FLAG_CHUNKED));
4346
4347       if (!(csp->flags & CSP_FLAG_CRUNCHED)
4348          && (csp->server_connection.sfd != JB_INVALID_SOCKET))
4349       {
4350          if (!(csp->flags & CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET))
4351          {
4352             csp->server_connection.keep_alive_timeout = csp->config->default_server_timeout;
4353          }
4354          if (!(csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
4355             || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4356             || !socket_is_still_alive(csp->server_connection.sfd)
4357             || !(latency < csp->server_connection.keep_alive_timeout))
4358          {
4359             log_error(LOG_LEVEL_CONNECT,
4360                "Closing server socket %d connected to %s. "
4361                "Keep-alive: %u. Tainted: %u. Socket alive: %u. Timeout: %u.",
4362                csp->server_connection.sfd, csp->server_connection.host,
4363                0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
4364                0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
4365                socket_is_still_alive(csp->server_connection.sfd),
4366                csp->server_connection.keep_alive_timeout);
4367 #ifdef FEATURE_CONNECTION_SHARING
4368             if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4369             {
4370                forget_connection(csp->server_connection.sfd);
4371             }
4372 #endif /* def FEATURE_CONNECTION_SHARING */
4373 #ifdef FEATURE_HTTPS_INSPECTION
4374             close_server_ssl_connection(csp);
4375 #endif
4376             close_socket(csp->server_connection.sfd);
4377             mark_connection_closed(&csp->server_connection);
4378          }
4379       }
4380
4381       if (continue_chatting && any_loaded_file_changed(csp))
4382       {
4383          continue_chatting = 0;
4384          config_file_change_detected = 1;
4385       }
4386 #ifdef FEATURE_HTTPS_INSPECTION
4387       if (continue_chatting && client_use_ssl(csp) &&
4388          csp->ssl_with_client_is_opened == 0)
4389       {
4390          continue_chatting = 0;
4391          log_error(LOG_LEVEL_CONNECT, "Client socket %d is no longer usable. "
4392             "The TLS session has been terminated.", csp->cfd);
4393       }
4394 #endif
4395
4396       if (continue_chatting)
4397       {
4398          if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
4399             && socket_is_still_alive(csp->cfd))
4400          {
4401             log_error(LOG_LEVEL_CONNECT, "Client request %d has been "
4402                "pipelined on socket %d and the socket is still alive.",
4403                csp->requests_received_total+1, csp->cfd);
4404             prepare_csp_for_next_request(csp);
4405             continue;
4406          }
4407
4408          if (0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
4409          {
4410             if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4411             {
4412                log_error(LOG_LEVEL_CONNECT,
4413                   "Waiting for the next client request on socket %d. "
4414                   "Keeping the server socket %d to %s open.",
4415                   csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
4416             }
4417             else
4418             {
4419                log_error(LOG_LEVEL_CONNECT,
4420                   "Waiting for the next client request on socket %d. "
4421                   "No server socket to keep open.", csp->cfd);
4422             }
4423          }
4424
4425          if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4426             && data_is_available(csp->cfd, (int)csp->config->keep_alive_timeout)
4427             && socket_is_still_alive(csp->cfd))
4428          {
4429             log_error(LOG_LEVEL_CONNECT,
4430                "Data arrived in time on client socket %d. Requests so far: %u",
4431                csp->cfd, csp->requests_received_total);
4432             prepare_csp_for_next_request(csp);
4433          }
4434          else
4435          {
4436 #ifdef FEATURE_CONNECTION_SHARING
4437             if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4438                && (csp->server_connection.sfd != JB_INVALID_SOCKET)
4439                && (socket_is_still_alive(csp->server_connection.sfd))
4440 #ifdef FEATURE_HTTPS_INSPECTION
4441                && !server_use_ssl(csp)
4442 #endif
4443                 )
4444             {
4445                time_t time_open = time(NULL) - csp->server_connection.timestamp;
4446
4447                if (csp->server_connection.keep_alive_timeout < time_open - (time_t)latency)
4448                {
4449                   break;
4450                }
4451
4452                remember_connection(&csp->server_connection);
4453                csp->server_connection.sfd = JB_INVALID_SOCKET;
4454                drain_and_close_socket(csp->cfd);
4455                csp->cfd = JB_INVALID_SOCKET;
4456                privoxy_mutex_lock(&connection_reuse_mutex);
4457                if (!monitor_thread_running)
4458                {
4459                   monitor_thread_running = 1;