Add support for filering client request bodies
[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    if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
563    {
564       log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
565          " Privoxy isn't configured to accept intercepted requests.",
566          csp->ip_addr_str, csp->http->cmd);
567       /* XXX: Use correct size */
568       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
569          csp->ip_addr_str, csp->http->cmd);
570
571       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
572          get_write_delay(csp));
573       destroy_list(headers);
574
575       return JB_ERR_PARSE;
576    }
577    else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
578    {
579       /* Split the domain we just got for pattern matching */
580       init_domain_components(csp->http);
581
582       return JB_ERR_OK;
583    }
584    else
585    {
586       /* We can't work without destination. Go spread the news.*/
587
588       /* XXX: Use correct size */
589       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
590          csp->ip_addr_str, csp->http->cmd);
591       log_error(LOG_LEVEL_ERROR,
592          "Privoxy was unable to get the destination for %s's request: %s",
593          csp->ip_addr_str, csp->http->cmd);
594
595       write_socket_delayed(csp->cfd, MISSING_DESTINATION_RESPONSE,
596          strlen(MISSING_DESTINATION_RESPONSE), get_write_delay(csp));
597       destroy_list(headers);
598
599       return JB_ERR_PARSE;
600    }
601    /*
602     * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
603     * to get the destination IP address, use it as host directly
604     * or do a reverse DNS lookup first.
605     */
606 }
607
608
609 /*********************************************************************
610  *
611  * Function    :  get_server_headers
612  *
613  * Description :  Parses server headers in iob and fills them
614  *                into csp->headers so that they can later be
615  *                handled by sed().
616  *
617  * Parameters  :
618  *          1  :  csp = Current client state (buffers, headers, etc...)
619  *
620  * Returns     :  JB_ERR_OK if everything went fine, or
621  *                JB_ERR_PARSE if the headers were incomplete.
622  *
623  *********************************************************************/
624 static jb_err get_server_headers(struct client_state *csp)
625 {
626    int continue_hack_in_da_house = 0;
627    char * header;
628
629    while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
630    {
631       if (header == NULL)
632       {
633          /*
634           * continue hack in da house. Ignore the ending of
635           * this head and continue enlisting header lines.
636           * The reason is described below.
637           */
638          enlist(csp->headers, "");
639          continue_hack_in_da_house = 0;
640          continue;
641       }
642       else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
643       {
644          /*
645           * It's a bodyless continue response, don't
646           * stop header parsing after reaching its end.
647           *
648           * As a result Privoxy will concatenate the
649           * next response's head and parse and deliver
650           * the headers as if they belonged to one request.
651           *
652           * The client will separate them because of the
653           * empty line between them.
654           *
655           * XXX: What we're doing here is clearly against
656           * the intended purpose of the continue header,
657           * and under some conditions (HTTP/1.0 client request)
658           * it's a standard violation.
659           *
660           * Anyway, "sort of against the spec" is preferable
661           * to "always getting confused by Continue responses"
662           * (Privoxy's behaviour before this hack was added)
663           */
664          log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
665          continue_hack_in_da_house = 1;
666       }
667       else if (*header == '\0')
668       {
669          /*
670           * If the header is empty, but the Continue hack
671           * isn't active, we can assume that we reached the
672           * end of the buffer before we hit the end of the
673           * head.
674           *
675           * Inform the caller an let it decide how to handle it.
676           */
677          return JB_ERR_PARSE;
678       }
679
680       if (JB_ERR_MEMORY == enlist(csp->headers, header))
681       {
682          /*
683           * XXX: Should we quit the request and return a
684           * out of memory error page instead?
685           */
686          log_error(LOG_LEVEL_ERROR,
687             "Out of memory while enlisting server headers. %s lost.",
688             header);
689       }
690       freez(header);
691    }
692
693    return JB_ERR_OK;
694 }
695
696
697 /*********************************************************************
698  *
699  * Function    :  crunch_reason
700  *
701  * Description :  Translates the crunch reason code into a string.
702  *
703  * Parameters  :
704  *          1  :  rsp = a http_response
705  *
706  * Returns     :  A string with the crunch reason or an error description.
707  *
708  *********************************************************************/
709 static const char *crunch_reason(const struct http_response *rsp)
710 {
711    char * reason = NULL;
712
713    assert(rsp != NULL);
714    if (rsp == NULL)
715    {
716       return "Internal error while searching for crunch reason";
717    }
718
719    switch (rsp->crunch_reason)
720    {
721       case UNSUPPORTED:
722          reason = "Unsupported HTTP feature";
723          break;
724       case BLOCKED:
725          reason = "Blocked";
726          break;
727       case UNTRUSTED:
728          reason = "Untrusted";
729          break;
730       case REDIRECTED:
731          reason = "Redirected";
732          break;
733       case CGI_CALL:
734          reason = "CGI Call";
735          break;
736       case NO_SUCH_DOMAIN:
737          reason = "DNS failure";
738          break;
739       case FORWARDING_FAILED:
740          reason = "Forwarding failed";
741          break;
742       case CONNECT_FAILED:
743          reason = "Connection failure";
744          break;
745       case OUT_OF_MEMORY:
746          reason = "Out of memory (may mask other reasons)";
747          break;
748       case CONNECTION_TIMEOUT:
749          reason = "Connection timeout";
750          break;
751       case NO_SERVER_DATA:
752          reason = "No server data received";
753          break;
754       default:
755          reason = "No reason recorded";
756          break;
757    }
758
759    return reason;
760 }
761
762
763 /*********************************************************************
764  *
765  * Function    :  log_applied_actions
766  *
767  * Description :  Logs the applied actions if LOG_LEVEL_ACTIONS is
768  *                enabled.
769  *
770  * Parameters  :
771  *          1  :  actions = Current action spec to log
772  *
773  * Returns     :  Nothing.
774  *
775  *********************************************************************/
776 static void log_applied_actions(const struct current_action_spec *actions)
777 {
778    /*
779     * The conversion to text requires lots of memory allocations so
780     * we only do the conversion if the user is actually interested.
781     */
782    if (debug_level_is_enabled(LOG_LEVEL_ACTIONS))
783    {
784       char *actions_as_text = actions_to_line_of_text(actions);
785       log_error(LOG_LEVEL_ACTIONS, "%s", actions_as_text);
786       freez(actions_as_text);
787    }
788 }
789
790
791 /*********************************************************************
792  *
793  * Function    :  send_crunch_response
794  *
795  * Description :  Delivers already prepared response for
796  *                intercepted requests, logs the interception
797  *                and frees the response.
798  *
799  * Parameters  :
800  *          1  :  csp = Current client state (buffers, headers, etc...)
801  *          2  :  rsp = Fully prepared response. Will be freed on exit.
802  *
803  * Returns     :  Nothing.
804  *
805  *********************************************************************/
806 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
807 {
808       const struct http_request *http = csp->http;
809       char status_code[4];
810
811       assert(rsp != NULL);
812       assert(rsp->head != NULL);
813
814       if (rsp == NULL)
815       {
816          log_error(LOG_LEVEL_FATAL, "NULL response in send_crunch_response.");
817       }
818
819       /*
820        * Extract the status code from the actual head
821        * that will be send to the client. It is the only
822        * way to get it right for all requests, including
823        * the fixed ones for out-of-memory problems.
824        *
825        * A head starts like this: 'HTTP/1.1 200...'
826        *                           0123456789|11
827        *                                     10
828        */
829       status_code[0] = rsp->head[9];
830       status_code[1] = rsp->head[10];
831       status_code[2] = rsp->head[11];
832       status_code[3] = '\0';
833
834       /* Log that the request was crunched and why. */
835       log_applied_actions(csp->action);
836 #ifdef FEATURE_HTTPS_INSPECTION
837       if (client_use_ssl(csp))
838       {
839          log_error(LOG_LEVEL_CRUNCH, "%s: https://%s%s", crunch_reason(rsp),
840             http->hostport, http->path);
841          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" %s %lu",
842             csp->ip_addr_str, http->gpc, http->hostport, http->path,
843             http->version, status_code, rsp->content_length);
844       }
845       else
846 #endif
847       {
848          log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
849          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %lu",
850             csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
851       }
852       /* Write the answer to the client */
853 #ifdef FEATURE_HTTPS_INSPECTION
854       if (client_use_ssl(csp))
855       {
856          if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
857                 (const unsigned char *)rsp->head, rsp->head_length,
858                 get_write_delay(csp)) < 0)
859           || (ssl_send_data_delayed(&(csp->ssl_client_attr),
860                 (const unsigned char *)rsp->body, rsp->content_length,
861                 get_write_delay(csp)) < 0))
862          {
863             /* There is nothing we can do about it. */
864             log_error(LOG_LEVEL_CONNECT, "Couldn't deliver the error message "
865                "for https://%s%s through client socket %d using TLS/SSL",
866                http->hostport, http->url, csp->cfd);
867          }
868       }
869       else
870 #endif
871       {
872          if (write_socket_delayed(csp->cfd, rsp->head, rsp->head_length,
873                 get_write_delay(csp))
874           || write_socket_delayed(csp->cfd, rsp->body, rsp->content_length,
875                 get_write_delay(csp)))
876          {
877             /* There is nothing we can do about it. */
878             log_error(LOG_LEVEL_CONNECT,
879                "Couldn't deliver the error message for %s through client socket %d: %E",
880                http->url, csp->cfd);
881          }
882       }
883
884       /* Clean up and return */
885       if (cgi_error_memory() != rsp)
886       {
887          free_http_response(rsp);
888       }
889       return;
890 }
891
892
893 /*********************************************************************
894  *
895  * Function    :  crunch_response_triggered
896  *
897  * Description :  Checks if the request has to be crunched,
898  *                and delivers the crunch response if necessary.
899  *
900  * Parameters  :
901  *          1  :  csp = Current client state (buffers, headers, etc...)
902  *          2  :  crunchers = list of cruncher functions to run
903  *
904  * Returns     :  TRUE if the request was answered with a crunch response
905  *                FALSE otherwise.
906  *
907  *********************************************************************/
908 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
909 {
910    struct http_response *rsp = NULL;
911    const struct cruncher *c;
912
913    /*
914     * If CGI request crunching is disabled,
915     * check the CGI dispatcher out of order to
916     * prevent unintentional blocks or redirects.
917     */
918    if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
919        && (NULL != (rsp = dispatch_cgi(csp))))
920    {
921       /* Deliver, log and free the interception response. */
922       send_crunch_response(csp, rsp);
923       csp->flags |= CSP_FLAG_CRUNCHED;
924       return TRUE;
925    }
926
927    for (c = crunchers; c->cruncher != NULL; c++)
928    {
929       /*
930        * Check the cruncher if either Privoxy is toggled
931        * on and the request isn't forced, or if the cruncher
932        * applies to forced requests as well.
933        */
934       if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
935           !(csp->flags & CSP_FLAG_FORCED)) ||
936           (c->flags & CF_IGNORE_FORCE))
937       {
938          rsp = c->cruncher(csp);
939          if (NULL != rsp)
940          {
941             /* Deliver, log and free the interception response. */
942             send_crunch_response(csp, rsp);
943             csp->flags |= CSP_FLAG_CRUNCHED;
944 #ifdef FEATURE_STATISTICS
945             if (c->flags & CF_COUNT_AS_REJECT)
946             {
947                csp->flags |= CSP_FLAG_REJECTED;
948             }
949 #endif /* def FEATURE_STATISTICS */
950
951             return TRUE;
952          }
953       }
954    }
955
956    return FALSE;
957 }
958
959
960 /*********************************************************************
961  *
962  * Function    :  build_request_line
963  *
964  * Description :  Builds the HTTP request line.
965  *
966  *                If a HTTP forwarder is used it expects the whole URL,
967  *                web servers only get the path.
968  *
969  * Parameters  :
970  *          1  :  csp = Current client state (buffers, headers, etc...)
971  *          2  :  fwd = The forwarding spec used for the request
972  *                XXX: Should use http->fwd instead.
973  *          3  :  request_line = The old request line which will be replaced.
974  *
975  * Returns     :  Nothing. Terminates in case of memory problems.
976  *
977  *********************************************************************/
978 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
979 {
980    struct http_request *http = csp->http;
981
982    /*
983     * Downgrade http version from 1.1 to 1.0
984     * if +downgrade action applies.
985     */
986    if ((csp->action->flags & ACTION_DOWNGRADE)
987      && (!strcmpic(http->version, "HTTP/1.1")))
988    {
989       freez(http->version);
990       http->version = strdup_or_die("HTTP/1.0");
991    }
992
993    /*
994     * Rebuild the request line.
995     */
996    freez(*request_line);
997    *request_line = strdup(http->gpc);
998    string_append(request_line, " ");
999
1000    if (fwd->forward_host && fwd->type != FORWARD_WEBSERVER)
1001    {
1002       string_append(request_line, http->url);
1003    }
1004    else
1005    {
1006       string_append(request_line, http->path);
1007    }
1008    string_append(request_line, " ");
1009    string_append(request_line, http->version);
1010
1011    if (*request_line == NULL)
1012    {
1013       log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1014    }
1015    log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1016 }
1017
1018
1019 /*********************************************************************
1020  *
1021  * Function    :  change_request_destination
1022  *
1023  * Description :  Parse a (rewritten) request line and regenerate
1024  *                the http request data.
1025  *
1026  * Parameters  :
1027  *          1  :  csp = Current client state (buffers, headers, etc...)
1028  *
1029  * Returns     :  Forwards the parse_http_request() return code.
1030  *                Terminates in case of memory problems.
1031  *
1032  *********************************************************************/
1033 static jb_err change_request_destination(struct client_state *csp)
1034 {
1035    struct http_request *http = csp->http;
1036    jb_err err;
1037
1038    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
1039       csp->headers->first->str);
1040    free_http_request(http);
1041    err = parse_http_request(csp->headers->first->str, http);
1042    if (JB_ERR_OK != err)
1043    {
1044       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1045          jb_err_to_string(err));
1046    }
1047
1048    return err;
1049 }
1050
1051
1052 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1053 /*********************************************************************
1054  *
1055  * Function    :  server_response_is_complete
1056  *
1057  * Description :  Determines whether we should stop reading
1058  *                from the server socket.
1059  *
1060  * Parameters  :
1061  *          1  :  csp = Current client state (buffers, headers, etc...)
1062  *          2  :  content_length = Length of content received so far.
1063  *
1064  * Returns     :  TRUE if the response is complete,
1065  *                FALSE otherwise.
1066  *
1067  *********************************************************************/
1068 static int server_response_is_complete(struct client_state *csp,
1069    unsigned long long content_length)
1070 {
1071    int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1072
1073    if (!strcmpic(csp->http->gpc, "HEAD"))
1074    {
1075       /*
1076        * "HEAD" implies no body, we are thus expecting
1077        * no content. XXX: incomplete "list" of methods?
1078        */
1079       csp->expected_content_length = 0;
1080       content_length_known = TRUE;
1081       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1082    }
1083
1084    if (csp->http->status == 204 || csp->http->status == 304)
1085    {
1086       /*
1087        * Expect no body. XXX: incomplete "list" of status codes?
1088        */
1089       csp->expected_content_length = 0;
1090       content_length_known = TRUE;
1091       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1092    }
1093
1094    return (content_length_known && ((0 == csp->expected_content_length)
1095             || (csp->expected_content_length <= content_length)));
1096 }
1097
1098
1099 #ifdef FEATURE_CONNECTION_SHARING
1100 /*********************************************************************
1101  *
1102  * Function    :  wait_for_alive_connections
1103  *
1104  * Description :  Waits for alive connections to timeout.
1105  *
1106  * Parameters  :  N/A
1107  *
1108  * Returns     :  N/A
1109  *
1110  *********************************************************************/
1111 static void wait_for_alive_connections(void)
1112 {
1113    int connections_alive = close_unusable_connections();
1114
1115    while (0 < connections_alive)
1116    {
1117       log_error(LOG_LEVEL_CONNECT,
1118          "Waiting for %d connections to timeout.",
1119          connections_alive);
1120       sleep(60);
1121       connections_alive = close_unusable_connections();
1122    }
1123
1124    log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1125
1126 }
1127 #endif /* def FEATURE_CONNECTION_SHARING */
1128
1129
1130 /*********************************************************************
1131  *
1132  * Function    :  save_connection_destination
1133  *
1134  * Description :  Remembers a connection for reuse later on.
1135  *
1136  * Parameters  :
1137  *          1  :  sfd  = Open socket to remember.
1138  *          2  :  http = The destination for the connection.
1139  *          3  :  fwd  = The forwarder settings used.
1140  *          4  :  server_connection  = storage.
1141  *
1142  * Returns     : void
1143  *
1144  *********************************************************************/
1145 void save_connection_destination(jb_socket sfd,
1146                                  const struct http_request *http,
1147                                  const struct forward_spec *fwd,
1148                                  struct reusable_connection *server_connection)
1149 {
1150    assert(sfd != JB_INVALID_SOCKET);
1151    assert(NULL != http->host);
1152
1153    server_connection->sfd = sfd;
1154    server_connection->host = strdup_or_die(http->host);
1155    server_connection->port = http->port;
1156
1157    assert(NULL != fwd);
1158    assert(server_connection->gateway_host == NULL);
1159    assert(server_connection->gateway_port == 0);
1160    assert(server_connection->forwarder_type == 0);
1161    assert(server_connection->forward_host == NULL);
1162    assert(server_connection->forward_port == 0);
1163
1164    server_connection->forwarder_type = fwd->type;
1165    if (NULL != fwd->gateway_host)
1166    {
1167       server_connection->gateway_host = strdup_or_die(fwd->gateway_host);
1168    }
1169    else
1170    {
1171       server_connection->gateway_host = NULL;
1172    }
1173    server_connection->gateway_port = fwd->gateway_port;
1174    if (NULL != fwd->auth_username)
1175    {
1176       server_connection->auth_username = strdup_or_die(fwd->auth_username);
1177    }
1178    else
1179    {
1180       server_connection->auth_username = NULL;
1181    }
1182    if (NULL != fwd->auth_password)
1183    {
1184       server_connection->auth_password = strdup_or_die(fwd->auth_password);
1185    }
1186    else
1187    {
1188       server_connection->auth_password = NULL;
1189    }
1190
1191    if (NULL != fwd->forward_host)
1192    {
1193       server_connection->forward_host = strdup_or_die(fwd->forward_host);
1194    }
1195    else
1196    {
1197       server_connection->forward_host = NULL;
1198    }
1199    server_connection->forward_port = fwd->forward_port;
1200 }
1201 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1202
1203
1204 /*********************************************************************
1205  *
1206  * Function    : verify_request_length
1207  *
1208  * Description : Checks if we already got the whole client requests
1209  *               and sets CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ if
1210  *               we do.
1211  *
1212  *               Data that doesn't belong to the current request is
1213  *               either thrown away to let the client retry on a clean
1214  *               socket, or stashed to be dealt with after the current
1215  *               request is served.
1216  *
1217  * Parameters  :
1218  *          1  :  csp = Current client state (buffers, headers, etc...)
1219  *
1220  * Returns     :  void
1221  *
1222  *********************************************************************/
1223 static void verify_request_length(struct client_state *csp)
1224 {
1225    unsigned long long buffered_request_bytes =
1226       (unsigned long long)(csp->client_iob->eod - csp->client_iob->cur);
1227
1228    if ((csp->expected_client_content_length != 0)
1229       && (buffered_request_bytes != 0))
1230    {
1231       if (csp->expected_client_content_length >= buffered_request_bytes)
1232       {
1233          csp->expected_client_content_length -= buffered_request_bytes;
1234          log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
1235             "to account for the %llu ones we already got.",
1236             csp->expected_client_content_length, buffered_request_bytes);
1237       }
1238       else
1239       {
1240          assert(csp->client_iob->eod > csp->client_iob->cur + csp->expected_client_content_length);
1241          csp->client_iob->eod = csp->client_iob->cur + csp->expected_client_content_length;
1242          log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
1243             "Marking the server socket tainted after throwing %llu bytes away.",
1244             buffered_request_bytes - csp->expected_client_content_length);
1245          csp->expected_client_content_length = 0;
1246          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1247       }
1248
1249       if (csp->expected_client_content_length == 0)
1250       {
1251          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1252       }
1253    }
1254
1255    if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
1256       && ((csp->client_iob->cur < csp->client_iob->eod)
1257          || (csp->expected_client_content_length != 0)))
1258    {
1259       if (strcmpic(csp->http->gpc, "GET")
1260          && strcmpic(csp->http->gpc, "HEAD")
1261          && strcmpic(csp->http->gpc, "TRACE")
1262          && strcmpic(csp->http->gpc, "OPTIONS")
1263          && strcmpic(csp->http->gpc, "DELETE"))
1264       {
1265          /* XXX: this is an incomplete hack */
1266          csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1267          log_error(LOG_LEVEL_CONNECT, "There better be a request body.");
1268       }
1269       else
1270       {
1271          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1272
1273          if ((csp->config->feature_flags & RUNTIME_FEATURE_TOLERATE_PIPELINING) == 0)
1274          {
1275             csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1276             log_error(LOG_LEVEL_CONNECT,
1277                "Possible pipeline attempt detected. The connection will not "
1278                "be kept alive and we will only serve the first request.");
1279             /* Nuke the pipelined requests from orbit, just to be sure. */
1280             clear_iob(csp->client_iob);
1281          }
1282          else
1283          {
1284             /*
1285              * Keep the pipelined data around for now, we'll deal with
1286              * it once we're done serving the current request.
1287              */
1288             csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
1289             assert(csp->client_iob->eod >= csp->client_iob->cur);
1290             log_error(LOG_LEVEL_CONNECT, "Complete client request followed by "
1291                "%d bytes of pipelined data received.",
1292                (int)(csp->client_iob->eod - csp->client_iob->cur));
1293          }
1294       }
1295    }
1296    else
1297    {
1298       csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1299       log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
1300    }
1301 }
1302
1303
1304 /*********************************************************************
1305  *
1306  * Function    :  mark_server_socket_tainted
1307  *
1308  * Description :  Makes sure we don't reuse a server socket
1309  *                (if we didn't read everything the server sent
1310  *                us reusing the socket would lead to garbage).
1311  *
1312  * Parameters  :
1313  *          1  :  csp = Current client state (buffers, headers, etc...)
1314  *
1315  * Returns     :  void.
1316  *
1317  *********************************************************************/
1318 static void mark_server_socket_tainted(struct client_state *csp)
1319 {
1320    /*
1321     * For consistency we always mark the server socket
1322     * tainted, however, to reduce the log noise we only
1323     * emit a log message if the server socket could have
1324     * actually been reused.
1325     */
1326    if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
1327       && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED))
1328    {
1329       log_error(LOG_LEVEL_CONNECT,
1330          "Marking the server socket %d tainted.",
1331          csp->server_connection.sfd);
1332    }
1333    csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1334 }
1335
1336 /*********************************************************************
1337  *
1338  * Function    :  get_request_line
1339  *
1340  * Description : Read the client request line.
1341  *
1342  * Parameters  :
1343  *          1  :  csp = Current client state (buffers, headers, etc...)
1344  *
1345  * Returns     :  Pointer to request line or NULL in case of errors.
1346  *
1347  *********************************************************************/
1348 static char *get_request_line(struct client_state *csp)
1349 {
1350    char buf[BUFFER_SIZE];
1351    char *request_line = NULL;
1352    int len;
1353
1354    memset(buf, 0, sizeof(buf));
1355
1356    if ((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
1357    {
1358       /*
1359        * If there are multiple pipelined requests waiting,
1360        * the flag will be set again once the next request
1361        * has been parsed.
1362        */
1363       csp->flags &= ~CSP_FLAG_PIPELINED_REQUEST_WAITING;
1364
1365       request_line = get_header(csp->client_iob);
1366       if ((NULL != request_line) && ('\0' != *request_line))
1367       {
1368          return request_line;
1369       }
1370       else
1371       {
1372          log_error(LOG_LEVEL_CONNECT, "No complete request line "
1373             "received yet. Continuing reading from %d.", csp->cfd);
1374       }
1375    }
1376
1377    do
1378    {
1379       if (
1380 #ifdef FUZZ
1381           0 == (csp->flags & CSP_FLAG_FUZZED_INPUT) &&
1382 #endif
1383           !data_is_available(csp->cfd, csp->config->socket_timeout)
1384           )
1385       {
1386          if (socket_is_still_alive(csp->cfd))
1387          {
1388             log_error(LOG_LEVEL_CONNECT,
1389                "No request line on socket %d received in time. Timeout: %d.",
1390                csp->cfd, csp->config->socket_timeout);
1391             write_socket_delayed(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
1392                strlen(CLIENT_CONNECTION_TIMEOUT_RESPONSE),
1393                get_write_delay(csp));
1394          }
1395          else
1396          {
1397             log_error(LOG_LEVEL_CONNECT,
1398                "The client side of the connection on socket %d got "
1399                "closed without sending a complete request line.", csp->cfd);
1400          }
1401          return NULL;
1402       }
1403
1404       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1405
1406       if (len <= 0) return NULL;
1407
1408       /*
1409        * If there is no memory left for buffering the
1410        * request, there is nothing we can do but hang up
1411        */
1412       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1413       {
1414          return NULL;
1415       }
1416
1417       request_line = get_header(csp->client_iob);
1418
1419    } while ((NULL != request_line) && ('\0' == *request_line));
1420
1421    return request_line;
1422
1423 }
1424
1425 enum chunk_status
1426 {
1427    CHUNK_STATUS_MISSING_DATA,
1428    CHUNK_STATUS_BODY_COMPLETE,
1429    CHUNK_STATUS_PARSE_ERROR
1430 };
1431
1432
1433 /*********************************************************************
1434  *
1435  * Function    :  chunked_body_is_complete
1436  *
1437  * Description :  Figures out whether or not a chunked body is complete.
1438  *
1439  *                Currently it always starts at the beginning of the
1440  *                buffer which is somewhat wasteful and prevents Privoxy
1441  *                from starting to forward the correctly parsed chunks
1442  *                as soon as theoretically possible.
1443  *
1444  *                Should be modified to work with a common buffer,
1445  *                and allow the caller to skip already parsed chunks.
1446  *
1447  *                This would allow the function to be used for unbuffered
1448  *                response bodies as well.
1449  *
1450  * Parameters  :
1451  *          1  :  iob = Buffer with the body to check.
1452  *          2  :  length = Length of complete body
1453  *
1454  * Returns     :  Enum with the result of the check.
1455  *
1456  *********************************************************************/
1457 static enum chunk_status chunked_body_is_complete(struct iob *iob, size_t *length)
1458 {
1459    unsigned int chunksize;
1460    char *p = iob->cur;
1461
1462    do
1463    {
1464       /*
1465        * We need at least a single digit, followed by "\r\n",
1466        * followed by an unknown amount of data, followed by "\r\n".
1467        */
1468       if (p + 5 > iob->eod)
1469       {
1470          return CHUNK_STATUS_MISSING_DATA;
1471       }
1472       if (sscanf(p, "%x", &chunksize) != 1)
1473       {
1474          return CHUNK_STATUS_PARSE_ERROR;
1475       }
1476
1477       /*
1478        * We want at least a single digit, followed by "\r\n",
1479        * followed by the specified amount of data, followed by "\r\n".
1480        */
1481       if (p + chunksize + 5 > iob->eod)
1482       {
1483          return CHUNK_STATUS_MISSING_DATA;
1484       }
1485
1486       /* Skip chunk-size. */
1487       p = strstr(p, "\r\n");
1488       if (NULL == p)
1489       {
1490          return CHUNK_STATUS_PARSE_ERROR;
1491       }
1492       /* Move beyond the chunkdata. */
1493       p += 2 + chunksize;
1494
1495       /* There should be another "\r\n" to skip */
1496       if (memcmp(p, "\r\n", 2))
1497       {
1498          return CHUNK_STATUS_PARSE_ERROR;
1499       }
1500       p += 2;
1501    } while (chunksize > 0U);
1502
1503    *length = (size_t)(p - iob->cur);
1504    assert(*length <= (size_t)(iob->eod - iob->cur));
1505    assert(p <= iob->eod);
1506
1507    return CHUNK_STATUS_BODY_COMPLETE;
1508
1509 }
1510
1511
1512 /*********************************************************************
1513  *
1514  * Function    : receive_chunked_client_request_body
1515  *
1516  * Description : Read the chunk-encoded client request body.
1517  *               Failures are dealt with.
1518  *
1519  * Parameters  :
1520  *          1  :  csp = Current client state (buffers, headers, etc...)
1521  *
1522  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1523  *
1524  *********************************************************************/
1525 static jb_err receive_chunked_client_request_body(struct client_state *csp)
1526 {
1527    size_t body_length;
1528    enum chunk_status status;
1529
1530    while (CHUNK_STATUS_MISSING_DATA ==
1531       (status = chunked_body_is_complete(csp->client_iob, &body_length)))
1532    {
1533       char buf[BUFFER_SIZE];
1534       int len;
1535
1536       if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1537       {
1538          log_error(LOG_LEVEL_ERROR,
1539             "Timeout while waiting for the client body.");
1540          break;
1541       }
1542       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1543       if (len <= 0)
1544       {
1545          log_error(LOG_LEVEL_ERROR, "Read the client body failed: %E");
1546          break;
1547       }
1548       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1549       {
1550          break;
1551       }
1552    }
1553    if (status != CHUNK_STATUS_BODY_COMPLETE)
1554    {
1555       write_socket_delayed(csp->cfd, CLIENT_BODY_PARSE_ERROR_RESPONSE,
1556          strlen(CLIENT_BODY_PARSE_ERROR_RESPONSE), get_write_delay(csp));
1557       log_error(LOG_LEVEL_CLF,
1558          "%s - - [%T] \"Failed reading chunked client body\" 400 0", csp->ip_addr_str);
1559       return JB_ERR_PARSE;
1560    }
1561    log_error(LOG_LEVEL_CONNECT,
1562       "Chunked client body completely read. Length: %lu", body_length);
1563    csp->expected_client_content_length = body_length;
1564
1565    return JB_ERR_OK;
1566
1567 }
1568
1569
1570 #ifdef FUZZ
1571 /*********************************************************************
1572  *
1573  * Function    :  fuzz_chunked_transfer_encoding
1574  *
1575  * Description :  Treat the fuzzed input as chunked transfer encoding
1576  *                to check and dechunk.
1577  *
1578  * Parameters  :
1579  *          1  :  csp      = Used to store the data.
1580  *          2  :  fuzz_input_file = File to read the input from.
1581  *
1582  * Returns     : Result of dechunking
1583  *
1584  *********************************************************************/
1585 extern int fuzz_chunked_transfer_encoding(struct client_state *csp, char *fuzz_input_file)
1586 {
1587    size_t length;
1588    size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
1589    enum chunk_status status;
1590
1591    status = chunked_body_is_complete(csp->iob, &length);
1592    if (CHUNK_STATUS_BODY_COMPLETE != status)
1593    {
1594       log_error(LOG_LEVEL_INFO, "Chunked body is incomplete or invalid");
1595    }
1596
1597    return (JB_ERR_OK == remove_chunked_transfer_coding(csp->iob->cur, &size));
1598
1599 }
1600
1601
1602 /*********************************************************************
1603  *
1604  * Function    : fuzz_client_request
1605  *
1606  * Description : Try to get a client request from the fuzzed input.
1607  *
1608  * Parameters  :
1609  *          1  :  csp = Current client state (buffers, headers, etc...)
1610  *          2  :  fuzz_input_file = File to read the input from.
1611  *
1612  * Returns     :  Result of fuzzing.
1613  *
1614  *********************************************************************/
1615 extern int fuzz_client_request(struct client_state *csp, char *fuzz_input_file)
1616 {
1617    jb_err err;
1618
1619    csp->cfd = 0;
1620    csp->ip_addr_str = "fuzzer";
1621
1622    if (strcmp(fuzz_input_file, "-") != 0)
1623    {
1624       log_error(LOG_LEVEL_FATAL,
1625          "Fuzzed client requests can currently only be read from stdin (-).");
1626    }
1627    err = receive_client_request(csp);
1628    if (err != JB_ERR_OK)
1629    {
1630       return 1;
1631    }
1632    err = parse_client_request(csp);
1633    if (err != JB_ERR_OK)
1634    {
1635       return 1;
1636    }
1637
1638    return 0;
1639
1640 }
1641 #endif  /* def FUZZ */
1642
1643
1644 #ifdef FEATURE_FORCE_LOAD
1645 /*********************************************************************
1646  *
1647  * Function    :  force_required
1648  *
1649  * Description : Checks a request line to see if it contains
1650  *               the FORCE_PREFIX. If it does, it is removed
1651  *               unless enforcing requests has beend disabled.
1652  *
1653  * Parameters  :
1654  *          1  :  request_line = HTTP request line
1655  *
1656  * Returns     :  TRUE if force is required, FALSE otherwise.
1657  *
1658  *********************************************************************/
1659 static int force_required(const struct client_state *csp, char *request_line)
1660 {
1661    char *p;
1662
1663    p = strstr(request_line, "http://");
1664    if (p != NULL)
1665    {
1666       /* Skip protocol */
1667       p += strlen("http://");
1668    }
1669    else
1670    {
1671       /* Intercepted request usually don't specify the protocol. */
1672       p = request_line;
1673    }
1674
1675    /* Go to the beginning of the path */
1676    p = strstr(p, "/");
1677    if (p == NULL)
1678    {
1679       /*
1680        * If the path is missing the request line is invalid and we
1681        * are done here. The client-visible rejection happens later on.
1682        */
1683       return 0;
1684    }
1685
1686    if (0 == strncmpic(p, FORCE_PREFIX, strlen(FORCE_PREFIX) - 1))
1687    {
1688       if (!(csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS))
1689       {
1690          /* XXX: Should clean more carefully */
1691          strclean(request_line, FORCE_PREFIX);
1692          log_error(LOG_LEVEL_FORCE,
1693             "Enforcing request: \"%s\".", request_line);
1694
1695          return 1;
1696       }
1697       log_error(LOG_LEVEL_FORCE,
1698          "Ignored force prefix in request: \"%s\".", request_line);
1699    }
1700
1701    return 0;
1702
1703 }
1704 #endif /* def FEATURE_FORCE_LOAD */
1705
1706
1707 /*********************************************************************
1708  *
1709  * Function    :  receive_client_request
1710  *
1711  * Description : Read the client's request (more precisely the
1712  *               client headers) and answer it if necessary.
1713  *
1714  * Parameters  :
1715  *          1  :  csp = Current client state (buffers, headers, etc...)
1716  *
1717  * Returns     :  JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1718  *
1719  *********************************************************************/
1720 static jb_err receive_client_request(struct client_state *csp)
1721 {
1722    char buf[BUFFER_SIZE];
1723    char *p;
1724    char *req = NULL;
1725    struct http_request *http;
1726    int len;
1727    jb_err err;
1728
1729    /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1730    struct list header_list;
1731    struct list *headers = &header_list;
1732
1733    /* We don't care if the arriving data is a valid HTTP request or not. */
1734    csp->requests_received_total++;
1735
1736    http = csp->http;
1737
1738    memset(buf, 0, sizeof(buf));
1739
1740    req = get_request_line(csp);
1741    if (req == NULL)
1742    {
1743       mark_server_socket_tainted(csp);
1744       return JB_ERR_PARSE;
1745    }
1746    assert(*req != '\0');
1747
1748    if (client_protocol_is_unsupported(csp, req))
1749    {
1750       return JB_ERR_PARSE;
1751    }
1752
1753 #ifdef FEATURE_FORCE_LOAD
1754    if (force_required(csp, req))
1755    {
1756       csp->flags |= CSP_FLAG_FORCED;
1757    }
1758 #endif /* def FEATURE_FORCE_LOAD */
1759
1760    err = parse_http_request(req, http);
1761    freez(req);
1762    if (JB_ERR_OK != err)
1763    {
1764       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1765          get_write_delay(csp));
1766       /* XXX: Use correct size */
1767       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1768       log_error(LOG_LEVEL_ERROR,
1769          "Couldn't parse request line received from %s: %s",
1770          csp->ip_addr_str, jb_err_to_string(err));
1771
1772       free_http_request(http);
1773       return JB_ERR_PARSE;
1774    }
1775
1776    /* grab the rest of the client's headers */
1777    init_list(headers);
1778    for (;;)
1779    {
1780       p = get_header(csp->client_iob);
1781
1782       if (p == NULL)
1783       {
1784          /* There are no additional headers to read. */
1785          break;
1786       }
1787
1788       if (*p == '\0')
1789       {
1790          /*
1791           * We didn't receive a complete header
1792           * line yet, get the rest of it.
1793           */
1794          if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1795          {
1796             log_error(LOG_LEVEL_ERROR,
1797                "Stopped grabbing the client headers.");
1798             destroy_list(headers);
1799             return JB_ERR_PARSE;
1800          }
1801
1802          len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1803          if (len <= 0)
1804          {
1805             log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1806             destroy_list(headers);
1807             return JB_ERR_PARSE;
1808          }
1809
1810          if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1811          {
1812             /*
1813              * If there is no memory left for buffering the
1814              * request, there is nothing we can do but hang up
1815              */
1816             destroy_list(headers);
1817             return JB_ERR_MEMORY;
1818          }
1819       }
1820       else
1821       {
1822          if (!strncmpic(p, "Transfer-Encoding:", 18))
1823          {
1824             /*
1825              * XXX: should be called through sed()
1826              *      but currently can't.
1827              */
1828             client_transfer_encoding(csp, &p);
1829          }
1830          /*
1831           * We were able to read a complete
1832           * header and can finally enlist it.
1833           */
1834          enlist(headers, p);
1835          freez(p);
1836       }
1837    }
1838
1839    if (http->host == NULL)
1840    {
1841       /*
1842        * If we still don't know the request destination,
1843        * the request is invalid or the client uses
1844        * Privoxy without its knowledge.
1845        */
1846       if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1847       {
1848          /*
1849           * Our attempts to get the request destination
1850           * elsewhere failed or Privoxy is configured
1851           * to only accept proxy requests.
1852           *
1853           * An error response has already been send
1854           * and we're done here.
1855           */
1856          return JB_ERR_PARSE;
1857       }
1858    }
1859
1860 #ifdef FEATURE_CLIENT_TAGS
1861    /* XXX: If the headers were enlisted sooner, passing csp would do. */
1862    set_client_address(csp, headers);
1863    get_tag_list_for_client(csp->client_tags, csp->client_address);
1864 #endif
1865
1866    /*
1867     * Determine the actions for this URL
1868     */
1869 #ifdef FEATURE_TOGGLE
1870    if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1871    {
1872       /* Most compatible set of actions (i.e. none) */
1873       init_current_action(csp->action);
1874    }
1875    else
1876 #endif /* ndef FEATURE_TOGGLE */
1877    {
1878       get_url_actions(csp, http);
1879    }
1880
1881    enlist(csp->headers, http->cmd);
1882
1883    /* Append the previously read headers */
1884    err = list_append_list_unique(csp->headers, headers);
1885    destroy_list(headers);
1886
1887    return err;
1888
1889 }
1890
1891
1892 /*********************************************************************
1893  *
1894  * Function    : parse_client_request
1895  *
1896  * Description : Parses the client's request and decides what to do
1897  *               with it.
1898  *
1899  *               Note that since we're not using select() we could get
1900  *               blocked here if a client connected, then didn't say
1901  *               anything!
1902  *
1903  * Parameters  :
1904  *          1  :  csp = Current client state (buffers, headers, etc...)
1905  *
1906  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1907  *
1908  *********************************************************************/
1909 static jb_err parse_client_request(struct client_state *csp)
1910 {
1911    struct http_request *http = csp->http;
1912    jb_err err;
1913
1914 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1915    if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
1916     && (!strcmpic(csp->http->version, "HTTP/1.1"))
1917     && (csp->http->ssl == 0))
1918    {
1919       /* Assume persistence until further notice */
1920       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
1921    }
1922 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1923
1924    if (csp->http->ssl == 0)
1925    {
1926       /*
1927        * This whole block belongs to chat() but currently
1928        * has to be executed before sed().
1929        */
1930       if (csp->flags & CSP_FLAG_CHUNKED_CLIENT_BODY)
1931       {
1932          if (receive_chunked_client_request_body(csp) != JB_ERR_OK)
1933          {
1934             return JB_ERR_PARSE;
1935          }
1936       }
1937       else
1938       {
1939          csp->expected_client_content_length = get_expected_content_length(csp->headers);
1940       }
1941       verify_request_length(csp);
1942    }
1943 #ifndef FEATURE_HTTPS_INSPECTION
1944    else
1945    {
1946       csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1947    }
1948 #endif
1949
1950    err = sed(csp, FILTER_CLIENT_HEADERS);
1951    if (JB_ERR_OK != err)
1952    {
1953       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
1954          csp->ip_addr_str);
1955       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1956          csp->ip_addr_str, csp->http->cmd);
1957       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER), get_write_delay(csp));
1958       return JB_ERR_PARSE;
1959    }
1960    csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
1961
1962    /* Check request line for rewrites. */
1963    if ((NULL == csp->headers->first->str)
1964       || (strcmp(http->cmd, csp->headers->first->str) &&
1965          (JB_ERR_OK != change_request_destination(csp))))
1966    {
1967       /*
1968        * A header filter broke the request line - bail out.
1969        */
1970       write_socket_delayed(csp->cfd, MESSED_UP_REQUEST_RESPONSE,
1971          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
1972       /* XXX: Use correct size */
1973       log_error(LOG_LEVEL_CLF,
1974          "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
1975       log_error(LOG_LEVEL_ERROR,
1976          "Invalid request line after applying header filters.");
1977       free_http_request(http);
1978
1979       return JB_ERR_PARSE;
1980    }
1981
1982    if (client_has_unsupported_expectations(csp))
1983    {
1984       return JB_ERR_PARSE;
1985    }
1986
1987    return JB_ERR_OK;
1988
1989 }
1990
1991
1992 /*********************************************************************
1993  *
1994  * Function    : read_http_request_body
1995  *
1996  * Description : Reads remaining request body from the client.
1997  *
1998  * Parameters  :
1999  *          1  :  csp = Current client state (buffers, headers, etc...)
2000  *
2001  * Returns     :  0 on success, anything else is an error.
2002  *
2003  *********************************************************************/
2004 static int read_http_request_body(struct client_state *csp)
2005 {
2006    size_t to_read = csp->expected_client_content_length;
2007    int len;
2008
2009    assert(to_read != 0);
2010
2011    /* check if all data has been already read */
2012    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2013    {
2014       return 0;
2015    }
2016
2017    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2018         to_read > 0 && data_is_available(csp->cfd, csp->config->socket_timeout);
2019         to_read -= (unsigned)len)
2020    {
2021       char buf[BUFFER_SIZE];
2022       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2023
2024       log_error(LOG_LEVEL_CONNECT,
2025          "Waiting for up to %d bytes of request body from the client.",
2026          max_bytes_to_read);
2027       len = read_socket(csp->cfd, buf, (int)max_bytes_to_read);
2028       if (len <= -1)
2029       {
2030          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s: %E", csp->ip_addr_str);
2031          return 1;
2032       }
2033       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2034       {
2035          return 1;
2036       }
2037       assert(to_read >= len);
2038    }
2039
2040    if (to_read != 0)
2041    {
2042       log_error(LOG_LEVEL_CONNECT, "Not enough request body has been read: expected %d more bytes",
2043          csp->expected_client_content_length);
2044       return 1;
2045    }
2046    log_error(LOG_LEVEL_CONNECT, "The last %d bytes of the request body have been read",
2047       csp->expected_client_content_length);
2048    return 0;
2049 }
2050
2051
2052 /*********************************************************************
2053  *
2054  * Function    : update_client_headers
2055  *
2056  * Description : Updates the HTTP headers from the client request.
2057  *
2058  * Parameters  :
2059  *          1  :  csp = Current client state (buffers, headers, etc...)
2060  *          2  :  new_content_length = new content length value to set
2061  *
2062  * Returns     :  0 on success, anything else is an error.
2063  *
2064  *********************************************************************/
2065 static int update_client_headers(struct client_state *csp, size_t new_content_length)
2066 {
2067    static const char content_length[] = "Content-Length:";
2068    int updated = 0;
2069    struct list_entry *p;
2070
2071 #ifndef FEATURE_HTTPS_INSPECTION
2072    for (p = csp->headers->first;
2073 #else
2074    for (p = csp->http->client_ssl ? csp->https_headers->first : csp->headers->first;
2075 #endif
2076         !updated  && (p != NULL); p = p->next)
2077    {
2078       /* Header crunch()ed in previous run? -> ignore */
2079       if (p->str == NULL)
2080       {
2081          continue;
2082       }
2083
2084       /* Does the current parser handle this header? */
2085       if (0 == strncmpic(p->str, content_length, sizeof(content_length) - 1))
2086       {
2087          updated = (JB_ERR_OK == header_adjust_content_length((char **)&(p->str), new_content_length));
2088          if (!updated)
2089          {
2090             return 1;
2091          }
2092       }
2093    }
2094
2095    return !updated;
2096 }
2097
2098
2099 /*********************************************************************
2100  *
2101  * Function    : can_filter_request_body
2102  *
2103  * Description : Checks if the current request body can be stored in
2104  *               the client_iob without hitting buffer limit.
2105  *
2106  * Parameters  :
2107  *          1  : csp = Current client state (buffers, headers, etc...)
2108  *
2109  * Returns     : TRUE if the current request size do not exceed buffer limit
2110  *               FALSE otherwise.
2111  *
2112  *********************************************************************/
2113 static int can_filter_request_body(const struct client_state *csp)
2114 {
2115    if (!can_add_to_iob(csp->client_iob, csp->config->buffer_limit,
2116                        csp->expected_client_content_length))
2117    {
2118       log_error(LOG_LEVEL_INFO,
2119          "Not filtering request body from %s: buffer limit %d will be exceeded "
2120          "(content length %d)", csp->ip_addr_str, csp->config->buffer_limit,
2121          csp->expected_client_content_length);
2122       return FALSE;
2123    }
2124    return TRUE;
2125 }
2126
2127
2128 /*********************************************************************
2129  *
2130  * Function    : send_http_request
2131  *
2132  * Description : Sends the HTTP headers from the client request
2133  *               and all the body data that has already been received.
2134  *
2135  * Parameters  :
2136  *          1  :  csp = Current client state (buffers, headers, etc...)
2137  *
2138  * Returns     :  0 on success, anything else is an error.
2139  *
2140  *********************************************************************/
2141 static int send_http_request(struct client_state *csp)
2142 {
2143    char *hdr;
2144    int write_failure;
2145    const char *to_send;
2146    size_t to_send_len;
2147    int filter_client_body = csp->expected_client_content_length != 0 &&
2148       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2149
2150    if (filter_client_body)
2151    {
2152       if (read_http_request_body(csp))
2153       {
2154          return 1;
2155       }
2156       to_send_len = csp->expected_client_content_length;
2157       to_send = execute_client_body_filters(csp, &to_send_len);
2158       if (to_send == NULL)
2159       {
2160          /* just flush client_iob */
2161          filter_client_body = FALSE;
2162       }
2163       else if (to_send_len != csp->expected_client_content_length &&
2164          update_client_headers(csp, to_send_len))
2165       {
2166          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2167          return 1;
2168       }
2169       csp->expected_client_content_length = 0;
2170    }
2171
2172    hdr = list_to_text(csp->headers);
2173    if (hdr == NULL)
2174    {
2175       /* FIXME Should handle error properly */
2176       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2177    }
2178    list_remove_all(csp->headers);
2179
2180    /*
2181     * Write the client's (modified) header to the server
2182     * (along with anything else that may be in the buffer)
2183     */
2184    write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
2185    freez(hdr);
2186
2187    if (write_failure)
2188    {
2189       log_error(LOG_LEVEL_CONNECT, "Failed sending request headers to: %s: %E",
2190          csp->http->hostport);
2191       return 1;
2192    }
2193
2194    if (filter_client_body)
2195    {
2196       write_failure = 0 != write_socket(csp->server_connection.sfd, to_send, to_send_len);
2197       freez(to_send);
2198       if (write_failure)
2199       {
2200          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s: %E",
2201             csp->http->hostport);
2202          return 1;
2203       }
2204    }
2205
2206    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2207       && (flush_iob(csp->server_connection.sfd, csp->client_iob, 0) < 0))
2208    {
2209       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2210          csp->http->hostport);
2211       return 1;
2212    }
2213    return 0;
2214 }
2215
2216
2217 #ifdef FEATURE_HTTPS_INSPECTION
2218 /*********************************************************************
2219  *
2220  * Function    : read_https_request_body
2221  *
2222  * Description : Reads remaining request body from the client.
2223  *
2224  * Parameters  :
2225  *          1  :  csp = Current client state (buffers, headers, etc...)
2226  *
2227  * Returns     :  0 on success, anything else is an error.
2228  *
2229  *********************************************************************/
2230 static int read_https_request_body(struct client_state *csp)
2231 {
2232    size_t to_read = csp->expected_client_content_length;
2233    int len;
2234
2235    assert(to_read != 0);
2236
2237    /* check if all data has been already read */
2238    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2239    {
2240       return 0;
2241    }
2242
2243    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2244         to_read > 0 && (is_ssl_pending(&(csp->ssl_client_attr)) ||
2245           data_is_available(csp->cfd, csp->config->socket_timeout));
2246         to_read -= (unsigned)len)
2247    {
2248       unsigned char buf[BUFFER_SIZE];
2249       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2250
2251       log_error(LOG_LEVEL_CONNECT,
2252          "Waiting for up to %d bytes of request body from the client.",
2253          max_bytes_to_read);
2254       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2255          (unsigned)max_bytes_to_read);
2256       if (len <= 0)
2257       {
2258          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s", csp->ip_addr_str);
2259          return 1;
2260       }
2261       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2262       {
2263          return 1;
2264       }
2265       assert(to_read >= len);
2266    }
2267
2268    if (to_read != 0)
2269    {
2270       log_error(LOG_LEVEL_CONNECT, "Not enough request body has been read: expected %d more bytes", to_read);
2271       return 1;
2272    }
2273
2274    log_error(LOG_LEVEL_CONNECT, "The last %d bytes of the request body have been read",
2275       csp->expected_client_content_length);
2276    return 0;
2277 }
2278
2279
2280 /*********************************************************************
2281  *
2282  * Function    : receive_and_send_encrypted_post_data
2283  *
2284  * Description : Reads remaining request body from the client and sends
2285  *               it to the server.
2286  *
2287  * Parameters  :
2288  *          1  :  csp = Current client state (buffers, headers, etc...)
2289  *
2290  * Returns     :  0 on success, anything else is an error.
2291  *
2292  *********************************************************************/
2293 static int receive_and_send_encrypted_post_data(struct client_state *csp)
2294 {
2295    int content_length_known = csp->expected_client_content_length != 0;
2296
2297    while (is_ssl_pending(&(csp->ssl_client_attr))
2298       || (content_length_known && csp->expected_client_content_length != 0))
2299    {
2300       unsigned char buf[BUFFER_SIZE];
2301       int len;
2302       int max_bytes_to_read = sizeof(buf);
2303
2304       if (content_length_known && csp->expected_client_content_length < sizeof(buf))
2305       {
2306          max_bytes_to_read = (int)csp->expected_client_content_length;
2307       }
2308       log_error(LOG_LEVEL_CONNECT,
2309          "Waiting for up to %d bytes of request body from the client.",
2310          max_bytes_to_read);
2311       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2312          (unsigned)max_bytes_to_read);
2313       if (len == -1)
2314       {
2315          return 1;
2316       }
2317       if (len == 0)
2318       {
2319          /* XXX: Does this actually happen? */
2320          break;
2321       }
2322       log_error(LOG_LEVEL_CONNECT, "Forwarding %d bytes of encrypted request body",
2323          len);
2324       len = ssl_send_data(&(csp->ssl_server_attr), buf, (size_t)len);
2325       if (len == -1)
2326       {
2327          return 1;
2328       }
2329       if (csp->expected_client_content_length != 0)
2330       {
2331          if (csp->expected_client_content_length >= len)
2332          {
2333             csp->expected_client_content_length -= (unsigned)len;
2334          }
2335          if (csp->expected_client_content_length == 0)
2336          {
2337             log_error(LOG_LEVEL_CONNECT, "Forwarded the last %d bytes", len);
2338             break;
2339          }
2340       }
2341    }
2342
2343    log_error(LOG_LEVEL_CONNECT, "Done forwarding encrypted request body");
2344
2345    return 0;
2346
2347 }
2348
2349
2350 /*********************************************************************
2351  *
2352  * Function    : send_https_request
2353  *
2354  * Description : Sends the HTTP headers from the client request
2355  *               and all the body data that has already been received.
2356  *
2357  * Parameters  :
2358  *          1  :  csp = Current client state (buffers, headers, etc...)
2359  *
2360  * Returns     :  0 on success, anything else is an error.
2361  *
2362  *********************************************************************/
2363 static int send_https_request(struct client_state *csp)
2364 {
2365    char *hdr;
2366    int ret;
2367    long flushed = 0;
2368    const char *to_send;
2369    size_t to_send_len;
2370    int filter_client_body = csp->expected_client_content_length != 0 &&
2371       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2372
2373    if (filter_client_body)
2374    {
2375       if (read_https_request_body(csp))
2376       {
2377          return 1;
2378       }
2379       to_send_len = csp->expected_client_content_length;
2380       to_send = execute_client_body_filters(csp, &to_send_len);
2381       if (to_send == NULL)
2382       {
2383          /* just flush client_iob */
2384          filter_client_body = FALSE;
2385       }
2386       else if (to_send_len != csp->expected_client_content_length &&
2387          update_client_headers(csp, to_send_len))
2388       {
2389          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2390          return 1;
2391       }
2392       csp->expected_client_content_length = 0;
2393    }
2394
2395    hdr = list_to_text(csp->https_headers);
2396    if (hdr == NULL)
2397    {
2398       /* FIXME Should handle error properly */
2399       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2400    }
2401    list_remove_all(csp->https_headers);
2402
2403    /*
2404     * Write the client's (modified) header to the server
2405     * (along with anything else that may be in the buffer)
2406     */
2407    ret = ssl_send_data(&(csp->ssl_server_attr),
2408       (const unsigned char *)hdr, strlen(hdr));
2409    freez(hdr);
2410
2411    if (ret < 0)
2412    {
2413       log_error(LOG_LEVEL_CONNECT,
2414          "Failed sending encrypted request headers to: %s: %E",
2415          csp->http->hostport);
2416       mark_server_socket_tainted(csp);
2417       return 1;
2418    }
2419
2420    if (filter_client_body)
2421    {
2422       ret = ssl_send_data(&(csp->ssl_server_attr), (const unsigned char *)to_send, to_send_len);
2423       freez(to_send);
2424       if (ret < 0)
2425       {
2426          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s",
2427             csp->http->hostport);
2428          return 1;
2429       }
2430    }
2431
2432    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2433       && ((flushed = ssl_flush_socket(&(csp->ssl_server_attr),
2434             csp->client_iob)) < 0))
2435    {
2436       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2437          csp->http->hostport);
2438       return 1;
2439    }
2440    if (flushed != 0 || csp->expected_client_content_length != 0)
2441    {
2442       if (csp->expected_client_content_length != 0)
2443       {
2444          if (csp->expected_client_content_length < flushed)
2445          {
2446             log_error(LOG_LEVEL_ERROR,
2447                "Flushed %ld bytes of request body while only expecting %llu",
2448                flushed, csp->expected_client_content_length);
2449             csp->expected_client_content_length = 0;
2450          }
2451          else
2452          {
2453             log_error(LOG_LEVEL_CONNECT,
2454                "Flushed %ld bytes of request body while expecting %llu",
2455                flushed, csp->expected_client_content_length);
2456             csp->expected_client_content_length -= (unsigned)flushed;
2457             if (receive_and_send_encrypted_post_data(csp))
2458             {
2459                return 1;
2460             }
2461          }
2462       }
2463       else
2464       {
2465          log_error(LOG_LEVEL_CONNECT,
2466             "Flushed %ld bytes of request body", flushed);
2467       }
2468    }
2469
2470    log_error(LOG_LEVEL_CONNECT, "Encrypted request sent");
2471
2472    return 0;
2473
2474 }
2475
2476
2477 /*********************************************************************
2478  *
2479  * Function    :  receive_encrypted_request
2480  *
2481  * Description :  Receives an encrypted request.
2482  *
2483  * Parameters  :
2484  *          1  :  csp = Current client state (buffers, headers, etc...)
2485  *
2486  * Returns     :  JB_ERR_OK on success,
2487  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2488  *
2489  *********************************************************************/
2490 static jb_err receive_encrypted_request(struct client_state *csp)
2491 {
2492    char buf[BUFFER_SIZE];
2493    int len;
2494    char *p;
2495
2496    do
2497    {
2498       log_error(LOG_LEVEL_HEADER, "Reading encrypted headers");
2499       if (!is_ssl_pending(&(csp->ssl_client_attr)) &&
2500           !data_is_available(csp->cfd, csp->config->socket_timeout))
2501       {
2502          log_error(LOG_LEVEL_CONNECT,
2503             "Socket %d timed out while waiting for client headers", csp->cfd);
2504          return JB_ERR_PARSE;
2505       }
2506       len = ssl_recv_data(&(csp->ssl_client_attr),
2507          (unsigned char *)buf, sizeof(buf));
2508       if (len == 0)
2509       {
2510          log_error(LOG_LEVEL_CONNECT,
2511             "Socket %d closed while waiting for client headers", csp->cfd);
2512          return JB_ERR_PARSE;
2513       }
2514       if (len == -1)
2515       {
2516          return JB_ERR_PARSE;
2517       }
2518       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2519       {
2520          return JB_ERR_MEMORY;
2521       }
2522       p = strstr(csp->client_iob->cur, "\r\n\r\n");
2523    } while (p == NULL);
2524
2525    log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2526
2527    return JB_ERR_OK;
2528 }
2529
2530
2531 /*********************************************************************
2532  *
2533  * Function    :  process_encrypted_request
2534  *
2535  * Description :  Receives and parses an encrypted request.
2536  *
2537  * Parameters  :
2538  *          1  :  csp = Current client state (buffers, headers, etc...)
2539  *
2540  * Returns     :  JB_ERR_OK on success,
2541  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2542  *
2543  *********************************************************************/
2544 static jb_err process_encrypted_request(struct client_state *csp)
2545 {
2546    char *p;
2547    char *request_line;
2548    jb_err err;
2549    /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2550    struct list header_list;
2551    struct list *headers = &header_list;
2552
2553    assert(csp->ssl_with_client_is_opened);
2554
2555 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2556    if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2557    {
2558       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2559    }
2560 #endif
2561    err = receive_encrypted_request(csp);
2562    if (err != JB_ERR_OK)
2563    {
2564       if (csp->client_iob->cur == NULL ||
2565           csp->client_iob->cur == csp->client_iob->eod)
2566       {
2567          /*
2568           * We did not receive any data, most likely because the
2569           * client is done. Don't log this as a parse failure.
2570           */
2571          return JB_ERR_PARSE;
2572       }
2573       /* XXX: Also used for JB_ERR_MEMORY */
2574       log_error(LOG_LEVEL_ERROR, "Failed to receive encrypted request: %s",
2575          jb_err_to_string(err));
2576       ssl_send_data_delayed(&(csp->ssl_client_attr),
2577          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2578       return err;
2579    }
2580
2581    /* We don't need get_request_line() because the whole HTTP head is buffered. */
2582    request_line = get_header(csp->client_iob);
2583    if (request_line == NULL)
2584    {
2585       log_error(LOG_LEVEL_ERROR, "Failed to get the encrypted request line");
2586       ssl_send_data_delayed(&(csp->ssl_client_attr),
2587          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2588       return JB_ERR_PARSE;
2589    }
2590    assert(*request_line != '\0');
2591
2592    if (client_protocol_is_unsupported(csp, request_line))
2593    {
2594       /*
2595        * If the protocol is unsupported we're done here.
2596        * client_protocol_is_unsupported() took care of sending
2597        * the error response and logging the error message.
2598        */
2599       return JB_ERR_PARSE;
2600    }
2601
2602 #ifdef FEATURE_FORCE_LOAD
2603    if (force_required(csp, request_line))
2604    {
2605       csp->flags |= CSP_FLAG_FORCED;
2606    }
2607 #endif /* def FEATURE_FORCE_LOAD */
2608
2609    free_http_request(csp->http);
2610
2611    err = parse_http_request(request_line, csp->http);
2612    /* XXX: Restore ssl setting. This is ugly */
2613    csp->http->client_ssl = 1;
2614    csp->http->server_ssl = 1;
2615
2616    freez(request_line);
2617    if (JB_ERR_OK != err)
2618    {
2619       ssl_send_data_delayed(&(csp->ssl_client_attr),
2620          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2621       /* XXX: Use correct size */
2622       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2623       log_error(LOG_LEVEL_ERROR,
2624          "Couldn't parse request line received from %s: %s",
2625          csp->ip_addr_str, jb_err_to_string(err));
2626
2627       free_http_request(csp->http);
2628       return JB_ERR_PARSE;
2629    }
2630
2631    /* Parse the rest of the client's headers. */
2632    init_list(headers);
2633    for (;;)
2634    {
2635       p = get_header(csp->client_iob);
2636
2637       if (p == NULL)
2638       {
2639          /* There are no additional headers to read. */
2640          break;
2641       }
2642       enlist(headers, p);
2643       freez(p);
2644    }
2645
2646    if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2647    {
2648       /*
2649        * Our attempts to get the request destination
2650        * elsewhere failed.
2651        */
2652       log_error(LOG_LEVEL_ERROR,
2653          "Failed to get the encrypted request destination");
2654       ssl_send_data_delayed(&(csp->ssl_client_attr),
2655          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2656       return JB_ERR_PARSE;
2657    }
2658
2659    /* Split the domain we just got for pattern matching */
2660    init_domain_components(csp->http);
2661
2662 #ifdef FEATURE_CLIENT_TAGS
2663    /* XXX: If the headers were enlisted sooner, passing csp would do. */
2664    if (csp->client_address == NULL)
2665    {
2666       set_client_address(csp, headers);
2667       get_tag_list_for_client(csp->client_tags, csp->client_address);
2668    }
2669 #endif
2670
2671 #ifdef FEATURE_TOGGLE
2672    if ((csp->flags & CSP_FLAG_TOGGLED_ON) != 0)
2673 #endif
2674    {
2675       /*
2676        * Determine the actions for this request after
2677        * clearing the ones from the previous one.
2678        */
2679       free_current_action(csp->action);
2680       get_url_actions(csp, csp->http);
2681    }
2682
2683    enlist(csp->https_headers, csp->http->cmd);
2684
2685    /* Append the previously read headers */
2686    err = list_append_list_unique(csp->https_headers, headers);
2687    destroy_list(headers);
2688    if (JB_ERR_OK != err)
2689    {
2690       /* XXX: Send error message */
2691       return err;
2692    }
2693
2694    /* XXX: Work around crash */
2695    csp->error_message = NULL;
2696
2697    /* XXX: Why do this here? */
2698    csp->http->ssl = 1;
2699
2700    err = sed_https(csp);
2701    if (JB_ERR_OK != err)
2702    {
2703       ssl_send_data_delayed(&(csp->ssl_client_attr),
2704          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2705       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2706          csp->ip_addr_str);
2707       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2708          csp->ip_addr_str, csp->http->cmd);
2709       return JB_ERR_PARSE;
2710    }
2711
2712    log_error(LOG_LEVEL_HEADER, "Encrypted request processed");
2713    log_applied_actions(csp->action);
2714    log_error(LOG_LEVEL_REQUEST, "https://%s%s", csp->http->hostport,
2715       csp->http->path);
2716
2717    return err;
2718
2719 }
2720
2721 /*********************************************************************
2722  *
2723  * Function    :  cgi_page_requested
2724  *
2725  * Description :  Checks if a request is for an internal CGI page.
2726  *
2727  * Parameters  :
2728  *          1  :  host = The host requested by the client.
2729  *
2730  * Returns     :  1 if a CGI page has been requested, 0 otherwise
2731  *
2732  *********************************************************************/
2733 static int cgi_page_requested(const char *host)
2734 {
2735    if ((0 == strcmpic(host, CGI_SITE_1_HOST))
2736     || (0 == strcmpic(host, CGI_SITE_1_HOST "."))
2737     || (0 == strcmpic(host, CGI_SITE_2_HOST))
2738     || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
2739    {
2740       return 1;
2741    }
2742
2743    return 0;
2744
2745 }
2746
2747
2748 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2749 /*********************************************************************
2750  *
2751  * Function    :  continue_https_chat
2752  *
2753  * Description :  Behaves similar to chat() but only deals with
2754  *                https-inspected requests that arrive on an already
2755  *                established connection. The first request is always
2756  *                served by chat() which is a lot more complex as it
2757  *                has to deal with forwarding settings and connection
2758  *                failures etc.
2759  *
2760  *                If a connection to the server has already been
2761  *                opened it is reused unless the request is blocked
2762  *                or the forwarder changed.
2763  *
2764  *                If a connection to the server has not yet been
2765  *                opened (because the previous request was crunched),
2766  *                or the forwarder changed, the connection is dropped
2767  *                so that the client retries on a fresh one.
2768  *
2769  * Parameters  :
2770  *          1  :  csp = Current client state (buffers, headers, etc...)
2771  *
2772  * Returns     :  Nothing.
2773  *
2774  *********************************************************************/
2775 static void continue_https_chat(struct client_state *csp)
2776 {
2777    const struct forward_spec *fwd;
2778
2779    if (JB_ERR_OK != process_encrypted_request(csp))
2780    {
2781       return;
2782    }
2783
2784    csp->requests_received_total++;
2785
2786    /*
2787     * We have an encrypted request. Check if one of the crunchers wants it.
2788     */
2789    if (crunch_response_triggered(csp, crunchers_all))
2790    {
2791       /*
2792        * Yes. The client got the crunch response and we're done here.
2793        */
2794       return;
2795    }
2796    if (csp->ssl_with_server_is_opened == 0)
2797    {
2798       log_error(LOG_LEVEL_CONNECT,
2799          "Dropping the client connection on socket %d. "
2800          "The server connection has not been established yet.",
2801          csp->cfd);
2802       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2803       return;
2804    }
2805    assert(csp->server_connection.sfd != JB_INVALID_SOCKET);
2806
2807    fwd = forward_url(csp, csp->http);
2808    if (!connection_destination_matches(&csp->server_connection, csp->http, fwd))
2809    {
2810       log_error(LOG_LEVEL_CONNECT,
2811          "Dropping the client connection on socket %d with "
2812          "server socket %d connected to %s. The forwarder has changed.",
2813          csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
2814       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2815       return;
2816    }
2817
2818    log_error(LOG_LEVEL_CONNECT,
2819       "Reusing server socket %d connected to %s. Requests already sent: %u.",
2820       csp->server_connection.sfd, csp->server_connection.host,
2821       csp->server_connection.requests_sent_total);
2822
2823    if (send_https_request(csp))
2824    {
2825       /*
2826        * Most likely the server connection timed out. We can't easily
2827        * create a new one so simply drop the client connection without a
2828        * error response to let the client retry.
2829        */
2830       log_error(LOG_LEVEL_CONNECT,
2831          "Dropping client connection on socket %d. "
2832          "Forwarding the encrypted client request failed.",
2833          csp->cfd);
2834       return;
2835    }
2836    csp->server_connection.requests_sent_total++;
2837    handle_established_connection(csp);
2838    freez(csp->receive_buffer);
2839 }
2840 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2841 #endif
2842
2843
2844 /*********************************************************************
2845  *
2846  * Function    :  handle_established_connection
2847  *
2848  * Description :  Shuffle data between client and server once the
2849  *                connection has been established.
2850  *
2851  * Parameters  :
2852  *          1  :  csp = Current client state (buffers, headers, etc...)
2853  *
2854  * Returns     :  Nothing.
2855  *
2856  *********************************************************************/
2857 static void handle_established_connection(struct client_state *csp)
2858 {
2859    char *hdr;
2860    char *p;
2861    int n;
2862 #ifdef HAVE_POLL
2863    struct pollfd poll_fds[2];
2864 #else
2865    fd_set rfds;
2866    jb_socket maxfd;
2867    struct timeval timeout;
2868 #endif
2869    int server_body;
2870    int ms_iis5_hack = 0;
2871    unsigned long long byte_count = 0;
2872    struct http_request *http;
2873    long len = 0; /* for buffer sizes (and negative error codes) */
2874    int buffer_and_filter_content = 0;
2875    unsigned int write_delay;
2876 #ifdef FEATURE_HTTPS_INSPECTION
2877    int ret = 0;
2878    int use_ssl_tunnel = 0;
2879    csp->dont_verify_certificate = 0;
2880
2881    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION))
2882    {
2883       /* Pass encrypted content without filtering. */
2884       use_ssl_tunnel = 1;
2885    }
2886 #endif
2887
2888    /* Skeleton for HTTP response, if we should intercept the request */
2889    struct http_response *rsp;
2890 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2891    int watch_client_socket;
2892 #endif
2893
2894    csp->receive_buffer_size = csp->config->receive_buffer_size;
2895    csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
2896    if (csp->receive_buffer == NULL)
2897    {
2898       log_error(LOG_LEVEL_ERROR,
2899          "Out of memory. Failed to allocate the receive buffer.");
2900       rsp = cgi_error_memory();
2901       send_crunch_response(csp, rsp);
2902       return;
2903    }
2904
2905    http = csp->http;
2906
2907 #ifndef HAVE_POLL
2908    maxfd = (csp->cfd > csp->server_connection.sfd) ?
2909       csp->cfd : csp->server_connection.sfd;
2910 #endif
2911
2912    /* pass data between the client and server
2913     * until one or the other shuts down the connection.
2914     */
2915
2916    server_body = 0;
2917
2918 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2919    watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
2920 #endif
2921    write_delay = get_write_delay(csp);
2922
2923    for (;;)
2924    {
2925 #ifndef HAVE_POLL
2926       FD_ZERO(&rfds);
2927 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2928       if (!watch_client_socket)
2929       {
2930          maxfd = csp->server_connection.sfd;
2931       }
2932       else
2933 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2934       {
2935          FD_SET(csp->cfd, &rfds);
2936       }
2937
2938       FD_SET(csp->server_connection.sfd, &rfds);
2939 #endif /* ndef HAVE_POLL */
2940
2941 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2942       if ((csp->flags & CSP_FLAG_CHUNKED)
2943          && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2944          && ((csp->iob->eod - csp->iob->cur) >= 5)
2945          && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2946       {
2947          /*
2948           * XXX: This check should be obsolete now,
2949           *      but let's wait a while to be sure.
2950           */
2951          log_error(LOG_LEVEL_CONNECT,
2952             "Looks like we got the last chunk together with "
2953             "the server headers but didn't detect it earlier. "
2954             "We better stop reading.");
2955          byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
2956          csp->expected_content_length = byte_count;
2957          csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2958       }
2959       if (server_body && server_response_is_complete(csp, byte_count))
2960       {
2961          if (csp->expected_content_length == byte_count)
2962          {
2963             log_error(LOG_LEVEL_CONNECT,
2964                "Done reading from server. Content length: %llu as expected. "
2965                "Bytes most recently read: %ld.",
2966                byte_count, len);
2967          }
2968          else
2969          {
2970             log_error(LOG_LEVEL_CONNECT,
2971                "Done reading from server. Expected content length: %llu. "
2972                "Actual content length: %llu. Bytes most recently read: %ld.",
2973                csp->expected_content_length, byte_count, len);
2974          }
2975          len = 0;
2976          /*
2977           * XXX: Should not jump around, handle_established_connection()
2978           * is complicated enough already.
2979           */
2980          goto reading_done;
2981       }
2982 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
2983
2984 #ifdef HAVE_POLL
2985       poll_fds[0].fd = csp->cfd;
2986 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2987       if (!watch_client_socket)
2988       {
2989          /*
2990           * Ignore incoming data, but still watch out
2991           * for disconnects etc. These flags are always
2992           * implied anyway but explicitly setting them
2993           * doesn't hurt.
2994           */
2995          poll_fds[0].events = POLLERR|POLLHUP;
2996       }
2997       else
2998 #endif
2999       {
3000          poll_fds[0].events = POLLIN;
3001       }
3002       poll_fds[1].fd = csp->server_connection.sfd;
3003       poll_fds[1].events = POLLIN;
3004       n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
3005 #else
3006       timeout.tv_sec = csp->config->socket_timeout;
3007       timeout.tv_usec = 0;
3008       n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
3009 #endif /* def HAVE_POLL */
3010
3011       /*server or client not responding in timeout */
3012       if (n == 0)
3013       {
3014          log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
3015             csp->config->socket_timeout, http->url);
3016          if ((byte_count == 0) && (http->ssl == 0))
3017          {
3018             send_crunch_response(csp, error_response(csp, "connection-timeout"));
3019          }
3020          mark_server_socket_tainted(csp);
3021 #ifdef FEATURE_HTTPS_INSPECTION
3022          close_client_and_server_ssl_connections(csp);
3023 #endif
3024          return;
3025       }
3026       else if (n < 0)
3027       {
3028 #ifdef HAVE_POLL
3029          log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
3030 #else
3031          log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
3032 #endif
3033          mark_server_socket_tainted(csp);
3034 #ifdef FEATURE_HTTPS_INSPECTION
3035          close_client_and_server_ssl_connections(csp);
3036 #endif
3037          return;
3038       }
3039
3040       /*
3041        * This is the body of the browser's request,
3042        * just read and write it.
3043        *
3044        * Receives data from browser and sends it to server
3045        *
3046        * XXX: Make sure the client doesn't use pipelining
3047        * behind Privoxy's back.
3048        */
3049 #ifdef HAVE_POLL
3050       if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
3051       {
3052          log_error(LOG_LEVEL_CONNECT,
3053             "The client socket %d has become unusable while "
3054             "the server socket %d is still open.",
3055             csp->cfd, csp->server_connection.sfd);
3056          mark_server_socket_tainted(csp);
3057          break;
3058       }
3059
3060       if (poll_fds[0].revents != 0)
3061 #else
3062       if (FD_ISSET(csp->cfd, &rfds))
3063 #endif /* def HAVE_POLL*/
3064       {
3065          int max_bytes_to_read = (int)csp->receive_buffer_size;
3066
3067 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3068          if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
3069          {
3070             if (data_is_available(csp->cfd, 0))
3071             {
3072                /*
3073                 * If the next request is already waiting, we have
3074                 * to stop select()ing the client socket. Otherwise
3075                 * we would always return right away and get nothing
3076                 * else done.
3077                 */
3078                watch_client_socket = 0;
3079                log_error(LOG_LEVEL_CONNECT,
3080                   "Stop watching client socket %d. "
3081                   "There's already another request waiting.",
3082                   csp->cfd);
3083                continue;
3084             }
3085             /*
3086              * If the client socket is set, but there's no data
3087              * available on the socket, the client went fishing
3088              * and continuing talking to the server makes no sense.
3089              */
3090             log_error(LOG_LEVEL_CONNECT,
3091                "The client closed socket %d while "
3092                "the server socket %d is still open.",
3093                csp->cfd, csp->server_connection.sfd);
3094             mark_server_socket_tainted(csp);
3095             break;
3096          }
3097          if (csp->expected_client_content_length != 0)
3098          {
3099             if (csp->expected_client_content_length < csp->receive_buffer_size)
3100             {
3101                max_bytes_to_read = (int)csp->expected_client_content_length;
3102             }
3103             log_error(LOG_LEVEL_CONNECT,
3104                "Waiting for up to %d bytes from the client.",
3105                max_bytes_to_read);
3106          }
3107          assert(max_bytes_to_read <= csp->receive_buffer_size);
3108 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3109
3110 #ifdef FEATURE_HTTPS_INSPECTION
3111          if (client_use_ssl(csp))
3112          {
3113             if (csp->http->status == 101)
3114             {
3115                len = ssl_recv_data(&(csp->ssl_client_attr),
3116                   (unsigned char *)csp->receive_buffer,
3117                   (size_t)max_bytes_to_read);
3118                if (len == -1)
3119                {
3120                   log_error(LOG_LEVEL_ERROR, "Failed to receive data "
3121                      "on client socket %d for an upgraded connection",
3122                      csp->cfd);
3123                   break;
3124                }
3125                if (len == 0)
3126                {
3127                   log_error(LOG_LEVEL_CONNECT, "Done receiving data "
3128                      "on client socket %d for an upgraded connection",
3129                      csp->cfd);
3130                   break;
3131                }
3132                byte_count += (unsigned long long)len;
3133                len = ssl_send_data(&(csp->ssl_server_attr),
3134                   (unsigned char *)csp->receive_buffer, (size_t)len);
3135                if (len == -1)
3136                {
3137                   log_error(LOG_LEVEL_ERROR, "Failed to send data "
3138                      "on server socket %d for an upgraded connection",
3139                      csp->server_connection.sfd);
3140                   break;
3141                }
3142                continue;
3143             }
3144             log_error(LOG_LEVEL_CONNECT, "Breaking with TLS/SSL.");
3145             break;
3146          }
3147          else
3148 #endif /* def FEATURE_HTTPS_INSPECTION */
3149          {
3150             len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
3151
3152             if (len <= 0)
3153             {
3154                /* XXX: not sure if this is necessary. */
3155                mark_server_socket_tainted(csp);
3156                break; /* "game over, man" */
3157             }
3158
3159 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3160             if (csp->expected_client_content_length != 0)
3161             {
3162                assert(len <= max_bytes_to_read);
3163                csp->expected_client_content_length -= (unsigned)len;
3164                log_error(LOG_LEVEL_CONNECT,
3165                   "Expected client content length set to %llu "
3166                   "after reading %ld bytes.",
3167                   csp->expected_client_content_length, len);
3168                if (csp->expected_client_content_length == 0)
3169                {
3170                   log_error(LOG_LEVEL_CONNECT,
3171                      "Done reading from the client.");
3172                   csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
3173                }
3174             }
3175 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3176
3177             if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
3178             {
3179                log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
3180                mark_server_socket_tainted(csp);
3181                return;
3182             }
3183          }
3184          continue;
3185       }
3186
3187       /*
3188        * The server wants to talk. It could be the header or the body.
3189        * If `hdr' is null, then it's the header otherwise it's the body.
3190        * FIXME: Does `hdr' really mean `host'? No.
3191        */
3192 #ifdef HAVE_POLL
3193       if (poll_fds[1].revents != 0)
3194 #else
3195       if (FD_ISSET(csp->server_connection.sfd, &rfds))
3196 #endif /* HAVE_POLL */
3197       {
3198 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3199          /*
3200           * If we are buffering content, we don't want to eat up to
3201           * buffer-limit bytes if the client no longer cares about them.
3202           * If we aren't buffering, however, a dead client socket will be
3203           * noticed pretty much right away anyway, so we can reduce the
3204           * overhead by skipping the check.
3205           */
3206          if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
3207          {
3208 #ifdef _WIN32
3209             log_error(LOG_LEVEL_CONNECT,
3210                "The server still wants to talk, but the client may already have hung up on us.");
3211 #else
3212             log_error(LOG_LEVEL_CONNECT,
3213                "The server still wants to talk, but the client hung up on us.");
3214             mark_server_socket_tainted(csp);
3215 #ifdef FEATURE_HTTPS_INSPECTION
3216             close_client_and_server_ssl_connections(csp);
3217 #endif
3218             return;
3219 #endif /* def _WIN32 */
3220          }
3221 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3222
3223 #ifdef FEATURE_HTTPS_INSPECTION
3224          /*
3225           * Reading data from standard or secured connection (HTTP/HTTPS)
3226           */
3227          if (server_use_ssl(csp))
3228          {
3229             len = ssl_recv_data(&(csp->ssl_server_attr),
3230                (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
3231          }
3232          else
3233 #endif
3234          {
3235             len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
3236                (int)csp->receive_buffer_size);
3237          }
3238
3239          if (len < 0)
3240          {
3241             log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
3242
3243             if ((http->ssl && (csp->fwd == NULL))
3244 #ifdef FEATURE_HTTPS_INSPECTION
3245                && use_ssl_tunnel
3246 #endif
3247                 )
3248             {
3249                /*
3250                 * Just hang up. We already confirmed the client's CONNECT
3251                 * request with status code 200 and unencrypted content is
3252                 * no longer welcome.
3253                 */
3254                log_error(LOG_LEVEL_ERROR,
3255                   "CONNECT already confirmed. Unable to tell the client about the problem.");
3256                return;
3257             }
3258             else if (byte_count)
3259             {
3260                /*
3261                 * Just hang up. We already transmitted the original headers
3262                 * and parts of the original content and therefore missed the
3263                 * chance to send an error message (without risking data corruption).
3264                 *
3265                 * XXX: we could retry with a fancy range request here.
3266                 */
3267                log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
3268                   "Unable to tell the client about the problem.");
3269                mark_server_socket_tainted(csp);
3270 #ifdef FEATURE_HTTPS_INSPECTION
3271                close_client_and_server_ssl_connections(csp);
3272 #endif
3273                return;
3274             }
3275             /*
3276              * XXX: Consider handling the cases above the same.
3277              */
3278             mark_server_socket_tainted(csp);
3279             len = 0;
3280          }
3281
3282 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3283          if (csp->flags & CSP_FLAG_CHUNKED)
3284          {
3285             if ((len >= 5) && !memcmp(csp->receive_buffer+len-5, "0\r\n\r\n", 5))
3286             {
3287                /* XXX: this is a temporary hack */
3288                log_error(LOG_LEVEL_CONNECT,
3289                   "Looks like we reached the end of the last chunk. "
3290                   "We better stop reading.");
3291                csp->expected_content_length = byte_count + (unsigned long long)len;
3292                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3293             }
3294          }
3295          reading_done:
3296 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3297
3298          /*
3299           * This is guaranteed by allocating with zalloc_or_die()
3300           * and never (intentionally) writing to the last byte.
3301           *
3302           * csp->receive_buffer_size is the size of the part of the
3303           * buffer we intentionally write to, but we actually
3304           * allocated csp->receive_buffer_size+1 bytes so the assertion
3305           * stays within the allocated range.
3306           */
3307          assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
3308
3309          /*
3310           * Add a trailing zero to let be able to use string operations.
3311           * XXX: do we still need this with filter_popups gone?
3312           */
3313          assert(len <= csp->receive_buffer_size);
3314          csp->receive_buffer[len] = '\0';
3315
3316          /*
3317           * Normally, this would indicate that we've read
3318           * as much as the server has sent us and we can
3319           * close the client connection.  However, Microsoft
3320           * in its wisdom has released IIS/5 with a bug that
3321           * prevents it from sending the trailing \r\n in
3322           * a 302 redirect header (and possibly other headers).
3323           * To work around this if we've haven't parsed
3324           * a full header we'll append a trailing \r\n
3325           * and see if this now generates a valid one.
3326           *
3327           * This hack shouldn't have any impacts.  If we've
3328           * already transmitted the header or if this is a
3329           * SSL connection, then we won't bother with this
3330           * hack.  So we only work on partially received
3331           * headers.  If we append a \r\n and this still
3332           * doesn't generate a valid header, then we won't
3333           * transmit anything to the client.
3334           */
3335          if (len == 0)
3336          {
3337
3338             if (server_body || (http->ssl
3339 #ifdef FEATURE_HTTPS_INSPECTION
3340                   && use_ssl_tunnel
3341 #endif
3342                ))
3343             {
3344                /*
3345                 * If we have been buffering up the document,
3346                 * now is the time to apply content modification
3347                 * and send the result to the client.
3348                 */
3349                if (buffer_and_filter_content)
3350                {
3351                   p = execute_content_filters(csp);
3352                   /*
3353                    * If content filtering fails, use the original
3354                    * buffer and length.
3355                    * (see p != NULL ? p : csp->iob->cur below)
3356                    */
3357                   if (NULL == p)
3358                   {
3359                      csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3360                   }
3361 #ifdef FEATURE_COMPRESSION
3362                   else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
3363                      && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
3364                   {
3365                      char *compressed_content = compress_buffer(p,
3366                         (size_t *)&csp->content_length, csp->config->compression_level);
3367                      if (compressed_content != NULL)
3368                      {
3369                         freez(p);
3370                         p = compressed_content;
3371                         csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
3372                      }
3373                   }
3374 #endif
3375
3376                   if (JB_ERR_OK != update_server_headers(csp))
3377                   {
3378                      log_error(LOG_LEVEL_FATAL,
3379                         "Failed to update server headers. after filtering.");
3380                   }
3381
3382                   hdr = list_to_text(csp->headers);
3383                   if (hdr == NULL)
3384                   {
3385                      /* FIXME Should handle error properly */
3386                      log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3387                   }
3388
3389 #ifdef FEATURE_HTTPS_INSPECTION
3390                   /*
3391                    * Sending data with standard or secured connection (HTTP/HTTPS)
3392                    */
3393                   if (client_use_ssl(csp))
3394                   {
3395                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3396                               (const unsigned char *)hdr, strlen(hdr),
3397                               get_write_delay(csp)) < 0)
3398                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3399                               (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
3400                               csp->content_length, get_write_delay(csp)) < 0))
3401                      {
3402                         log_error(LOG_LEVEL_ERROR, "write modified content to "
3403                            "client over TLS/SSL failed");
3404                         freez(hdr);
3405                         freez(p);
3406                         mark_server_socket_tainted(csp);
3407                         close_client_and_server_ssl_connections(csp);
3408                         return;
3409                      }
3410                   }
3411                   else
3412 #endif /* def FEATURE_HTTPS_INSPECTION */
3413                   {
3414                      if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3415                       || write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
3416                          (size_t)csp->content_length, write_delay))
3417                      {
3418                         log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3419                         freez(hdr);
3420                         freez(p);
3421                         mark_server_socket_tainted(csp);
3422                         return;
3423                      }
3424                   }
3425
3426                   freez(hdr);
3427                   freez(p);
3428                }
3429
3430                break; /* "game over, man" */
3431             }
3432
3433             /*
3434              * This is NOT the body, so
3435              * Let's pretend the server just sent us a blank line.
3436              */
3437             snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
3438             len = (int)strlen(csp->receive_buffer);
3439
3440             /*
3441              * Now, let the normal header parsing algorithm below do its
3442              * job.  If it fails, we'll exit instead of continuing.
3443              */
3444
3445             ms_iis5_hack = 1;
3446          }
3447
3448          /*
3449           * If we're in the body of the server document, just write it to
3450           * the client, unless we need to buffer the body for later
3451           * content-filtering.
3452           */
3453          if (server_body || (http->ssl
3454 #ifdef FEATURE_HTTPS_INSPECTION
3455                && use_ssl_tunnel
3456 #endif
3457             ))
3458          {
3459             if (buffer_and_filter_content)
3460             {
3461                /*
3462                 * If there is no memory left for buffering the content, or the buffer limit
3463                 * has been reached, switch to non-filtering mode, i.e. make & write the
3464                 * header, flush the iob and buf, and get out of the way.
3465                 */
3466                if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3467                {
3468                   size_t hdrlen;
3469                   long flushed;
3470
3471                   log_error(LOG_LEVEL_INFO,
3472                      "Flushing header and buffers. Stepping back from filtering.");
3473
3474                   hdr = list_to_text(csp->headers);
3475                   if (hdr == NULL)
3476                   {
3477                      /*
3478                       * Memory is too tight to even generate the header.
3479                       * Send our static "Out-of-memory" page.
3480                       */
3481                      log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3482                      rsp = cgi_error_memory();
3483                      send_crunch_response(csp, rsp);
3484                      mark_server_socket_tainted(csp);
3485 #ifdef FEATURE_HTTPS_INSPECTION
3486                      close_client_and_server_ssl_connections(csp);
3487 #endif
3488                      return;
3489                   }
3490                   hdrlen = strlen(hdr);
3491
3492 #ifdef FEATURE_HTTPS_INSPECTION
3493                   /*
3494                    * Sending data with standard or secured connection (HTTP/HTTPS)
3495                    */
3496                   if (client_use_ssl(csp))
3497                   {
3498                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3499                              (const unsigned char *)hdr, hdrlen, get_write_delay(csp)) < 0)
3500                         || ((flushed = ssl_flush_socket(&(csp->ssl_client_attr),
3501                                 csp->iob)) < 0)
3502                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3503                               (const unsigned char *)csp->receive_buffer, (size_t)len,
3504                               get_write_delay(csp)) < 0))
3505                      {
3506                         log_error(LOG_LEVEL_CONNECT,
3507                            "Flush header and buffers to client failed");
3508                         freez(hdr);
3509                         mark_server_socket_tainted(csp);
3510                         close_client_and_server_ssl_connections(csp);
3511                         return;
3512                      }
3513                   }
3514                   else
3515 #endif /* def FEATURE_HTTPS_INSPECTION */
3516                   {
3517                      if (write_socket_delayed(csp->cfd, hdr, hdrlen, write_delay)
3518                       || ((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3519                       || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3520                             write_delay))
3521                      {
3522                         log_error(LOG_LEVEL_CONNECT,
3523                            "Flush header and buffers to client failed: %E");
3524                         freez(hdr);
3525                         mark_server_socket_tainted(csp);
3526                         return;
3527                      }
3528                   }
3529
3530                   /*
3531                    * Reset the byte_count to the amount of bytes
3532                    * we just flushed. len will be added a few lines below,
3533                    * hdrlen doesn't matter for LOG_LEVEL_CLF.
3534                    */
3535                   byte_count = (unsigned long long)flushed;
3536                   freez(hdr);
3537                   buffer_and_filter_content = 0;
3538                   server_body = 1;
3539                }
3540             }
3541             else
3542             {
3543 #ifdef FEATURE_HTTPS_INSPECTION
3544                /*
3545                 * Sending data with standard or secured connection (HTTP/HTTPS)
3546                 */
3547                if (client_use_ssl(csp))
3548                {
3549                   ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3550                      (const unsigned char *)csp->receive_buffer, (size_t)len,
3551                      get_write_delay(csp));
3552                   if (ret < 0)
3553                   {
3554                      log_error(LOG_LEVEL_ERROR,
3555                         "Sending data to client failed");
3556                      mark_server_socket_tainted(csp);
3557                      close_client_and_server_ssl_connections(csp);
3558                      return;
3559                   }
3560                }
3561                else
3562 #endif /* def FEATURE_HTTPS_INSPECTION */
3563                {
3564                   if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3565                         (size_t)len, write_delay))
3566                   {
3567                      log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3568                      mark_server_socket_tainted(csp);
3569                      return;
3570                   }
3571                }
3572             }
3573             byte_count += (unsigned long long)len;
3574             continue;
3575          }
3576          else
3577          {
3578             /*
3579              * We're still looking for the end of the server's header.
3580              * Buffer up the data we just read.  If that fails, there's
3581              * little we can do but send our static out-of-memory page.
3582              */
3583             if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3584             {
3585                log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3586                rsp = cgi_error_memory();
3587                send_crunch_response(csp, rsp);
3588                mark_server_socket_tainted(csp);
3589 #ifdef FEATURE_HTTPS_INSPECTION
3590                close_client_and_server_ssl_connections(csp);
3591 #endif
3592                return;
3593             }
3594
3595             /* Convert iob into something sed() can digest */
3596             if (JB_ERR_PARSE == get_server_headers(csp))
3597             {
3598                if (ms_iis5_hack)
3599                {
3600                   /*
3601                    * Well, we tried our MS IIS/5 hack and it didn't work.
3602                    * The header is incomplete and there isn't anything
3603                    * we can do about it.
3604                    */
3605                   log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3606                      "Applying the MS IIS5 hack didn't help.");
3607                   log_error(LOG_LEVEL_CLF,
3608                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3609 #ifdef FEATURE_HTTPS_INSPECTION
3610                   /*
3611                    * Sending data with standard or secured connection (HTTP/HTTPS)
3612                    */
3613                   if (client_use_ssl(csp))
3614                   {
3615                      ssl_send_data_delayed(&(csp->ssl_client_attr),
3616                         (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3617                         strlen(INVALID_SERVER_HEADERS_RESPONSE), get_write_delay(csp));
3618                   }
3619                   else
3620 #endif /* def FEATURE_HTTPS_INSPECTION */
3621                   {
3622                      write_socket_delayed(csp->cfd,
3623                         INVALID_SERVER_HEADERS_RESPONSE,
3624                         strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3625                   }
3626                   mark_server_socket_tainted(csp);
3627 #ifdef FEATURE_HTTPS_INSPECTION
3628                   close_client_and_server_ssl_connections(csp);
3629 #endif
3630                   return;
3631                }
3632                else
3633                {
3634                   /*
3635                    * Since we have to wait for more from the server before
3636                    * we can parse the headers we just continue here.
3637                    */
3638                   log_error(LOG_LEVEL_CONNECT,
3639                      "Continuing buffering server headers from socket %d. "
3640                      "Bytes most recently read: %ld.", csp->cfd, len);
3641                   continue;
3642                }
3643             }
3644             else
3645             {
3646                /*
3647                 * Account for the content bytes we
3648                 * might have gotten with the headers.
3649                 */
3650                assert(csp->iob->eod >= csp->iob->cur);
3651                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3652             }
3653
3654             /* Did we actually get anything? */
3655             if (NULL == csp->headers->first)
3656             {
3657                if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
3658                {
3659                   log_error(LOG_LEVEL_ERROR,
3660                      "No server or forwarder response received on socket %d. "
3661                      "Closing client socket %d without sending data.",
3662                      csp->server_connection.sfd, csp->cfd);
3663                   log_error(LOG_LEVEL_CLF,
3664                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3665                }
3666                else
3667                {
3668                   log_error(LOG_LEVEL_ERROR,
3669                      "No server or forwarder response received on socket %d.",
3670                      csp->server_connection.sfd);
3671                   send_crunch_response(csp, error_response(csp, "no-server-data"));
3672                }
3673                free_http_request(http);
3674                mark_server_socket_tainted(csp);
3675 #ifdef FEATURE_HTTPS_INSPECTION
3676                close_client_and_server_ssl_connections(csp);
3677 #endif
3678                return;
3679             }
3680
3681             if (!csp->headers->first->str)
3682             {
3683                log_error(LOG_LEVEL_ERROR, "header search: csp->headers->first->str == NULL, assert will be called");
3684             }
3685             assert(csp->headers->first->str);
3686
3687             if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3688                 strncmpic(csp->headers->first->str, "ICY", 3))
3689             {
3690                /*
3691                 * It doesn't look like a HTTP (or Shoutcast) response:
3692                 * tell the client and log the problem.
3693                 */
3694                if (strlen(csp->headers->first->str) > 30)
3695                {
3696                   csp->headers->first->str[30] = '\0';
3697                }
3698                log_error(LOG_LEVEL_ERROR,
3699                   "Invalid server or forwarder response. Starts with: %s",
3700                   csp->headers->first->str);
3701                log_error(LOG_LEVEL_CLF,
3702                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3703 #ifdef FEATURE_HTTPS_INSPECTION
3704                /*
3705                 * Sending data with standard or secured connection (HTTP/HTTPS)
3706                 */
3707                if (client_use_ssl(csp))
3708                {
3709                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3710                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3711                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3712                      get_write_delay(csp));
3713                }
3714                else
3715 #endif /* def FEATURE_HTTPS_INSPECTION */
3716                {
3717                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3718                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3719                }
3720                free_http_request(http);
3721                mark_server_socket_tainted(csp);
3722 #ifdef FEATURE_HTTPS_INSPECTION
3723                close_client_and_server_ssl_connections(csp);
3724 #endif
3725                return;
3726             }
3727
3728             /*
3729              * We have now received the entire server header,
3730              * filter it and send the result to the client
3731              */
3732             if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3733             {
3734                log_error(LOG_LEVEL_CLF,
3735                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3736 #ifdef FEATURE_HTTPS_INSPECTION
3737                /*
3738                 * Sending data with standard or secured connection (HTTP/HTTPS)
3739                 */
3740                if (client_use_ssl(csp))
3741                {
3742                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3743                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3744                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3745                      get_write_delay(csp));
3746                }
3747                else
3748 #endif
3749                {
3750                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3751                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3752                }
3753                free_http_request(http);
3754                mark_server_socket_tainted(csp);
3755 #ifdef FEATURE_HTTPS_INSPECTION
3756                close_client_and_server_ssl_connections(csp);
3757 #endif
3758                return;
3759             }
3760             hdr = list_to_text(csp->headers);
3761             if (hdr == NULL)
3762             {
3763                /* FIXME Should handle error properly */
3764                log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3765             }
3766
3767             if ((csp->flags & CSP_FLAG_CHUNKED)
3768                && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3769                && ((csp->iob->eod - csp->iob->cur) >= 5)
3770                && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3771             {
3772                log_error(LOG_LEVEL_CONNECT,
3773                   "Looks like we got the last chunk together with "
3774                   "the server headers. We better stop reading.");
3775                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3776                csp->expected_content_length = byte_count;
3777                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3778             }
3779
3780             csp->server_connection.response_received = time(NULL);
3781
3782             if (crunch_response_triggered(csp, crunchers_light))
3783             {
3784                /*
3785                 * One of the tags created by a server-header
3786                 * tagger triggered a crunch. We already
3787                 * delivered the crunch response to the client
3788                 * and are done here after cleaning up.
3789                 */
3790                freez(hdr);
3791                mark_server_socket_tainted(csp);
3792 #ifdef FEATURE_HTTPS_INSPECTION
3793                close_client_and_server_ssl_connections(csp);
3794 #endif
3795                return;
3796             }
3797
3798             /* Buffer and pcrs filter this if appropriate. */
3799             buffer_and_filter_content = content_requires_filtering(csp);
3800
3801             if (!buffer_and_filter_content)
3802             {
3803                /*
3804                 * Write the server's (modified) header to
3805                 * the client (along with anything else that
3806                 * may be in the buffer). Use standard or secured
3807                 * connection.
3808                 */
3809 #ifdef FEATURE_HTTPS_INSPECTION
3810                if (client_use_ssl(csp))
3811                {
3812                   if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3813                           (const unsigned char *)hdr, strlen(hdr),
3814                           get_write_delay(csp)) < 0)
3815                      || (len = ssl_flush_socket(&(csp->ssl_client_attr),
3816                             csp->iob) < 0))
3817                   {
3818                      log_error(LOG_LEVEL_CONNECT, "Write header to client failed");
3819
3820                      /*
3821                       * The write failed, so don't bother mentioning it
3822                       * to the client... it probably can't hear us anyway.
3823                       */
3824                      freez(hdr);
3825                      mark_server_socket_tainted(csp);
3826 #ifdef FEATURE_HTTPS_INSPECTION
3827                      close_client_and_server_ssl_connections(csp);
3828 #endif
3829                      return;
3830                   }
3831                }
3832                else
3833 #endif /* def FEATURE_HTTPS_INSPECTION */
3834                {
3835                   if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3836                      || ((len = flush_iob(csp->cfd, csp->iob, write_delay)) < 0))
3837                   {
3838                      log_error(LOG_LEVEL_ERROR,
3839                         "write header to client failed");
3840                      /*
3841                       * The write failed, so don't bother mentioning it
3842                       * to the client... it probably can't hear us anyway.
3843                       */
3844                      freez(hdr);
3845                      mark_server_socket_tainted(csp);
3846                      return;
3847                   }
3848                }
3849                                 }
3850
3851             /* we're finished with the server's header */
3852
3853             freez(hdr);
3854             server_body = 1;
3855
3856             /*
3857              * If this was a MS IIS/5 hack then it means the server
3858              * has already closed the connection. Nothing more to read.
3859              * Time to bail.
3860              */
3861             if (ms_iis5_hack)
3862             {
3863                log_error(LOG_LEVEL_ERROR,
3864                   "Closed server connection detected. "
3865                   "Applying the MS IIS5 hack didn't help.");
3866                log_error(LOG_LEVEL_CLF,
3867                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3868 #ifdef FEATURE_HTTPS_INSPECTION
3869                /*
3870                 * Sending data with standard or secured connection (HTTP/HTTPS)
3871                 */
3872                if (client_use_ssl(csp))
3873                {
3874                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3875                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3876                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3877                      get_write_delay(csp));
3878                }
3879                else
3880 #endif /* def FEATURE_HTTPS_INSPECTION */
3881                {
3882                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3883                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3884                }
3885                mark_server_socket_tainted(csp);
3886 #ifdef FEATURE_HTTPS_INSPECTION
3887                close_client_and_server_ssl_connections(csp);
3888 #endif
3889                return;
3890             }
3891          }
3892          continue;
3893       }
3894       mark_server_socket_tainted(csp);
3895 #ifdef FEATURE_HTTPS_INSPECTION
3896       close_client_and_server_ssl_connections(csp);
3897 #endif
3898       return; /* huh? we should never get here */
3899    }
3900
3901    if (csp->content_length == 0)
3902    {
3903       /*
3904        * If Privoxy didn't recalculate the Content-Length,
3905        * byte_count is still correct.
3906        */
3907       csp->content_length = byte_count;
3908    }
3909
3910 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3911    if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3912       && (csp->expected_content_length != byte_count))
3913    {
3914       log_error(LOG_LEVEL_CONNECT,
3915          "Received %llu bytes while expecting %llu.",
3916          byte_count, csp->expected_content_length);
3917       mark_server_socket_tainted(csp);
3918    }
3919 #endif
3920
3921 #ifdef FEATURE_HTTPS_INSPECTION
3922    if (client_use_ssl(csp))
3923    {
3924       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" 200 %llu",
3925          csp->ip_addr_str, http->gpc, http->hostport, http->path,
3926          http->version, csp->content_length);
3927    }
3928    else
3929 #endif
3930    {
3931       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
3932          csp->ip_addr_str, http->ocmd, csp->content_length);
3933    }
3934    csp->server_connection.timestamp = time(NULL);
3935 }
3936
3937
3938 /*********************************************************************
3939  *
3940  * Function    :  chat
3941  *
3942  * Description :  Once a connection from the client has been accepted,
3943  *                this function is called (via serve()) to handle the
3944  *                main business of the communication.  This function
3945  *                returns after dealing with a single request. It can
3946  *                be called multiple times with the same client socket
3947  *                if the client is keeping the connection alive.
3948  *
3949  *                The decision whether or not a client connection will
3950  *                be kept alive is up to the caller which also must
3951  *                close the client socket when done.
3952  *
3953  *                FIXME: chat is nearly thousand lines long.
3954  *                Ridiculous.
3955  *
3956  * Parameters  :
3957  *          1  :  csp = Current client state (buffers, headers, etc...)
3958  *
3959  * Returns     :  Nothing.
3960  *
3961  *********************************************************************/
3962 static void chat(struct client_state *csp)
3963 {
3964    const struct forward_spec *fwd;
3965    struct http_request *http;
3966    /* Skeleton for HTTP response, if we should intercept the request */
3967    struct http_response *rsp;
3968 #ifdef FEATURE_HTTPS_INSPECTION
3969    int use_ssl_tunnel = 0;
3970 #endif
3971
3972    http = csp->http;
3973
3974    if (receive_client_request(csp) != JB_ERR_OK)
3975    {
3976       return;
3977    }
3978    if (parse_client_request(csp) != JB_ERR_OK)
3979    {
3980       return;
3981    }
3982
3983    /* decide how to route the HTTP request */
3984    fwd = forward_url(csp, http);
3985
3986 #ifdef FEATURE_HTTPS_INSPECTION
3987    /*
3988     * Setting flags to use old solution with SSL tunnel and to disable
3989     * certificate verification.
3990     */
3991    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION)
3992       && !cgi_page_requested(csp->http->host))
3993    {
3994       use_ssl_tunnel = 1;
3995    }
3996
3997    if (http->ssl && (csp->action->flags & ACTION_IGNORE_CERTIFICATE_ERRORS))
3998    {
3999       csp->dont_verify_certificate = 1;
4000    }
4001 #endif
4002
4003    /*
4004     * build the http request to send to the server
4005     * we have to do one of the following:
4006     *
4007     * create =    use the original HTTP request to create a new
4008     *             HTTP request that has either the path component
4009     *             without the http://domainspec (w/path) or the
4010     *             full orininal URL (w/url)
4011     *             Note that the path and/or the HTTP version may
4012     *             have been altered by now.
4013     *
4014     * SSL proxy = Open a socket to the host:port of the server
4015     *             and create TLS/SSL connection with server and
4016     *             with client. Then behave like mediator between
4017     *             client and server over TLS/SSL.
4018     *
4019     * SSL proxy = Pass the request unchanged if forwarding a CONNECT
4020     *    with     request to a parent proxy. Note that we'll be sending
4021     * forwarding  the CFAIL message ourselves if connecting to the parent
4022     *             fails, but we won't send a CSUCCEED message if it works,
4023     *             since that would result in a double message (ours and the
4024     *             parent's). After sending the request to the parent, we
4025     *             must parse answer and send it to client. If connection
4026     *             with server is established, we do TLS/SSL proxy. Otherwise
4027     *             we send parent response to client and close connections.
4028     *
4029     * here's the matrix:
4030     *                        SSL
4031     *                    0        1
4032     *                +--------+--------+
4033     *                |        |        |
4034     *             0  | create |   SSL  |
4035     *                | w/path |  proxy |
4036     *  Forwarding    +--------+--------+
4037     *                |        |   SSL  |
4038     *             1  | create |  proxy |
4039     *                | w/url  |+forward|
4040     *                +--------+--------+
4041     *
4042     */
4043
4044 #ifdef FEATURE_HTTPS_INSPECTION
4045    /*
4046     * Presetting SSL client and server flags
4047     */
4048    if (http->ssl && !use_ssl_tunnel)
4049    {
4050       http->client_ssl = 1;
4051       http->server_ssl = 1;
4052    }
4053    else
4054    {
4055       http->client_ssl = 0;
4056       http->server_ssl = 0;
4057    }
4058 #endif
4059
4060 #ifdef FEATURE_HTTPS_INSPECTION
4061    /*
4062     * Log the request unless we're https inspecting
4063     * in which case we don't have the path yet and
4064     * will log the request later.
4065     */
4066    if (!client_use_ssl(csp))
4067 #endif
4068    {
4069       log_error(LOG_LEVEL_REQUEST, "%s%s", http->hostport, http->path);
4070    }
4071
4072    if (http->ssl && connect_port_is_forbidden(csp))
4073    {
4074       const char *acceptable_connect_ports =
4075          csp->action->string[ACTION_STRING_LIMIT_CONNECT];
4076       assert(NULL != acceptable_connect_ports);
4077       log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
4078          "limit-connect{%s} doesn't allow CONNECT requests to %s",
4079          csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport);
4080       csp->action->flags |= ACTION_BLOCK;
4081       http->ssl = 0;
4082 #ifdef FEATURE_HTTPS_INSPECTION
4083       http->client_ssl = 0;
4084       http->server_ssl = 0;
4085 #endif
4086    }
4087
4088
4089    freez(csp->headers->first->str);
4090    build_request_line(csp, fwd, &csp->headers->first->str);
4091
4092    /*
4093     * We have a request. Check if one of the crunchers wants it
4094     * unless the client wants to use TLS/SSL in which case we
4095     * haven't setup the TLS context yet and will send the crunch
4096     * response later.
4097     */
4098    if (
4099 #ifdef FEATURE_HTTPS_INSPECTION
4100        !client_use_ssl(csp) &&
4101 #endif
4102        crunch_response_triggered(csp, crunchers_all))
4103    {
4104       /*
4105        * Yes. The client got the crunch response and we're done here.
4106        */
4107       return;
4108    }
4109
4110    log_applied_actions(csp->action);
4111    if (fwd->forward_host)
4112    {
4113       log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
4114          fwd->forward_host, fwd->forward_port, http->hostport);
4115    }
4116    else
4117    {
4118       log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
4119    }
4120
4121    /* here we connect to the server, gateway, or the forwarder */
4122
4123 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4124    if ((csp->server_connection.sfd != JB_INVALID_SOCKET)
4125       && socket_is_still_alive(csp->server_connection.sfd)
4126       && connection_destination_matches(&csp->server_connection, http, fwd))
4127    {
4128       log_error(LOG_LEVEL_CONNECT,
4129          "Reusing server socket %d connected to %s. Total requests: %u.",
4130          csp->server_connection.sfd, csp->server_connection.host,
4131          csp->server_connection.requests_sent_total);
4132    }
4133    else
4134    {
4135       if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4136       {
4137 #ifdef FEATURE_CONNECTION_SHARING
4138          if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING
4139 #ifdef FEATURE_HTTPS_INSPECTION
4140             && !server_use_ssl(csp)
4141 #endif
4142             )
4143          {
4144             remember_connection(&csp->server_connection);
4145          }
4146          else
4147 #endif /* def FEATURE_CONNECTION_SHARING */
4148          {
4149             log_error(LOG_LEVEL_CONNECT,
4150                "Closing server socket %d connected to %s. Total requests: %u.",
4151                csp->server_connection.sfd, csp->server_connection.host,
4152                csp->server_connection.requests_sent_total);
4153             close_socket(csp->server_connection.sfd);
4154          }
4155          mark_connection_closed(&csp->server_connection);
4156       }
4157 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4158 #ifdef FEATURE_HTTPS_INSPECTION
4159       if (http->ssl && !use_ssl_tunnel)
4160       {
4161          int ret;
4162          /*
4163           * Creating a SSL proxy.
4164           *
4165           * By sending the CSUCCEED message we're lying to the client as
4166           * the connection hasn't actually been established yet. We don't
4167           * establish the connection until we have seen and parsed the
4168           * encrypted client headers.
4169           */
4170          if (write_socket_delayed(csp->cfd, CSUCCEED,
4171                strlen(CSUCCEED), get_write_delay(csp)) != 0)
4172          {
4173             log_error(LOG_LEVEL_ERROR, "Sending SUCCEED to client failed");
4174             return;
4175          }
4176
4177          ret = create_client_ssl_connection(csp);
4178          if (ret != 0)
4179          {
4180             log_error(LOG_LEVEL_ERROR,
4181                "Failed to open a secure connection with the client");
4182             return;
4183          }
4184          if (JB_ERR_OK != process_encrypted_request(csp))
4185          {
4186             close_client_ssl_connection(csp);
4187             return;
4188          }
4189          /*
4190           * We have an encrypted request. Check if one of the crunchers now
4191           * wants it (for example because the previously invisible path was
4192           * required to match).
4193           */
4194          if (crunch_response_triggered(csp, crunchers_all))
4195          {
4196             /*
4197              * Yes. The client got the crunch response and we're done here.
4198              */
4199             return;
4200          }
4201       }
4202 #endif
4203       /*
4204        * Connecting to destination server
4205        */
4206       csp->server_connection.sfd = forwarded_connect(fwd, http, csp);
4207
4208       if (csp->server_connection.sfd == JB_INVALID_SOCKET)
4209       {
4210          if (fwd->type != SOCKS_NONE)
4211          {
4212             /* Socks error. */
4213             rsp = error_response(csp, "forwarding-failed");
4214          }
4215          else if (errno == EINVAL)
4216          {
4217             rsp = error_response(csp, "no-such-domain");
4218          }
4219          else
4220          {
4221             rsp = error_response(csp, "connect-failed");
4222          }
4223
4224          /* Write the answer to the client */
4225          if (rsp != NULL)
4226          {
4227             send_crunch_response(csp, rsp);
4228          }
4229
4230          /*
4231           * Temporary workaround to prevent already-read client
4232           * bodies from being parsed as new requests. For now we
4233           * err on the safe side and throw all the following
4234           * requests under the bus, even if no client body has been
4235           * buffered. A compliant client will repeat the dropped
4236           * requests on an untainted connection.
4237           *
4238           * The proper fix is to discard the no longer needed
4239           * client body in the buffer (if there is one) and to
4240           * continue parsing the bytes that follow.
4241           */
4242 #ifdef FEATURE_HTTPS_INSPECTION
4243          close_client_ssl_connection(csp);
4244 #endif
4245          drain_and_close_socket(csp->cfd);
4246          csp->cfd = JB_INVALID_SOCKET;
4247
4248          return;
4249       }
4250
4251 #ifdef FEATURE_HTTPS_INSPECTION
4252       /*
4253        * Creating TLS/SSL connections with destination server or parent
4254        * proxy. If forwarding is enabled, we must send client request to
4255        * parent proxy and receive, parse and resend parent proxy answer.
4256        */
4257       if (http->ssl && !use_ssl_tunnel)
4258       {
4259          if (fwd->forward_host != NULL)
4260          {
4261             char server_response[BUFFER_SIZE];
4262             int ret = 0;
4263             int len = 0;
4264             char *hdr = list_to_text(csp->headers);
4265             memset(server_response, 0, sizeof(server_response));
4266
4267             if (hdr == NULL)
4268             {
4269                log_error(LOG_LEVEL_FATAL,
4270                   "Out of memory parsing client header");
4271             }
4272             list_remove_all(csp->headers);
4273
4274             /*
4275              * Sending client's CONNECT request to the parent proxy
4276              */
4277             ret = write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
4278
4279             freez(hdr);
4280
4281             if (ret != 0)
4282             {
4283                log_error(LOG_LEVEL_CONNECT,
4284                   "Sending request headers to: %s failed", http->hostport);
4285                mark_server_socket_tainted(csp);
4286                close_client_ssl_connection(csp);
4287                return;
4288             }
4289
4290             /* Waiting for parent proxy server response */
4291             len = read_socket(csp->server_connection.sfd, server_response,
4292                sizeof(server_response)-1);
4293
4294             if (len <= 0)
4295             {
4296                log_error(LOG_LEVEL_ERROR, "No response from parent proxy "
4297                   "server on socket %d.", csp->server_connection.sfd);
4298
4299                rsp = error_response(csp, "no-server-data");
4300                if (rsp)
4301                {
4302                   send_crunch_response(csp, rsp);
4303                }
4304                mark_server_socket_tainted(csp);
4305                close_client_ssl_connection(csp);
4306                return;
4307             }
4308
4309             /*
4310              * Test if the connection to the destination server was
4311              * established successfully by the parent proxy.
4312              */
4313             if (!tunnel_established_successfully(server_response, (unsigned int)len))
4314             {
4315                log_error(LOG_LEVEL_ERROR,
4316                   "The forwarder %s failed to establish a connection with %s",
4317                   fwd->forward_host, http->host);
4318                rsp = error_response(csp, "connect-failed");
4319                if (rsp)
4320                {
4321                   send_crunch_response(csp, rsp);
4322                }
4323                mark_server_socket_tainted(csp);
4324                close_client_ssl_connection(csp);
4325                return;
4326             }
4327          } /* -END- if (fwd->forward_host != NULL) */
4328
4329          /*
4330           * We can now create the TLS/SSL connection with the destination server.
4331           */
4332          int ret = create_server_ssl_connection(csp);
4333          if (ret != 0)
4334          {
4335             if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4336                 csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4337             {
4338                /*
4339                 * If the server certificate is invalid, we must inform
4340                 * the client and then close connection to the client.
4341                 */
4342                ssl_send_certificate_error(csp);
4343                close_client_and_server_ssl_connections(csp);
4344                return;
4345             }
4346             if (csp->server_cert_verification_result == SSL_CERT_NOT_VERIFIED
4347              || csp->server_cert_verification_result == SSL_CERT_VALID)
4348             {
4349                /*
4350                 * The TLS/SSL connection wasn't created but an invalid
4351                 * certificate wasn't detected. Report it as connection
4352                 * failure.
4353                 */
4354                rsp = error_response(csp, "connect-failed");
4355                if (rsp)
4356                {
4357                   send_crunch_response(csp, rsp);
4358                }
4359                close_client_and_server_ssl_connections(csp);
4360                return;
4361             }
4362          }
4363       }/* -END- if (http->ssl) */
4364 #endif /* def FEATURE_HTTPS_INSPECTION */
4365
4366 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4367       save_connection_destination(csp->server_connection.sfd,
4368          http, fwd, &csp->server_connection);
4369       csp->server_connection.keep_alive_timeout =
4370          (unsigned)csp->config->keep_alive_timeout;
4371    }
4372 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4373
4374    csp->server_connection.requests_sent_total++;
4375
4376    if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first))
4377    {
4378       /* Client headers have been sent optimistically */
4379       assert(csp->headers->last == NULL);
4380    }
4381    else if (http->ssl == 0 || (fwd->forward_host
4382 #ifdef FEATURE_HTTPS_INSPECTION
4383          && use_ssl_tunnel
4384 #endif
4385            ))
4386    {
4387       if (send_http_request(csp))
4388       {
4389          rsp = error_response(csp, "connect-failed");
4390          if (rsp)
4391          {
4392             send_crunch_response(csp, rsp);
4393          }
4394          return;
4395       }
4396    }
4397    else
4398    {
4399       /*
4400        * Using old solution with SSL tunnel or new solution with SSL proxy
4401        */
4402       list_remove_all(csp->headers);
4403 #ifdef FEATURE_HTTPS_INSPECTION
4404       if (use_ssl_tunnel)
4405 #endif
4406       {
4407          /*
4408          * We're running an SSL tunnel and we're not forwarding,
4409          * so just ditch the client headers, send the "connect succeeded"
4410          * message to the client, flush the rest, and get out of the way.
4411          */
4412          if (write_socket_delayed(csp->cfd, CSUCCEED,
4413                strlen(CSUCCEED), get_write_delay(csp)))
4414          {
4415             return;
4416          }
4417       }
4418 #ifdef FEATURE_HTTPS_INSPECTION
4419       else
4420       {
4421          /*
4422           * If server certificate has been verified and is invalid,
4423           * we must inform the client and then close the connection
4424           * with client and server.
4425           */
4426          if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4427              csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4428          {
4429             ssl_send_certificate_error(csp);
4430             close_client_and_server_ssl_connections(csp);
4431             return;
4432          }
4433          if (send_https_request(csp))
4434          {
4435             rsp = error_response(csp, "connect-failed");
4436             if (rsp)
4437             {
4438                send_crunch_response(csp, rsp);
4439             }
4440             close_client_and_server_ssl_connections(csp);
4441             return;
4442          }
4443       }
4444 #endif /* def FEATURE_HTTPS_INSPECTION */
4445       clear_iob(csp->client_iob);
4446    }/* -END- else ... if (http->ssl == 1) */
4447
4448    log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
4449
4450    /* XXX: should the time start earlier for optimistically sent data? */
4451    csp->server_connection.request_sent = time(NULL);
4452
4453    handle_established_connection(csp);
4454    freez(csp->receive_buffer);
4455 }
4456
4457
4458 #ifdef FUZZ
4459 /*********************************************************************
4460  *
4461  * Function    :  fuzz_server_response
4462  *
4463  * Description :  Treat the input as a whole server response.
4464  *
4465  * Parameters  :