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