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_headers
2524  *
2525  * Description :  Receives the encrypted request headers when
2526  *                https-inspecting.
2527  *
2528  * Parameters  :
2529  *          1  :  csp = Current client state (buffers, headers, etc...)
2530  *
2531  * Returns     :  JB_ERR_OK on success,
2532  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2533  *
2534  *********************************************************************/
2535 static jb_err receive_encrypted_request_headers(struct client_state *csp)
2536 {
2537    char buf[BUFFER_SIZE];
2538    int len;
2539    char *p;
2540
2541    do
2542    {
2543       log_error(LOG_LEVEL_HEADER, "Waiting for encrypted client headers");
2544       if (!is_ssl_pending(&(csp->ssl_client_attr)) &&
2545           !data_is_available(csp->cfd, csp->config->socket_timeout))
2546       {
2547          log_error(LOG_LEVEL_CONNECT,
2548             "Socket %d timed out while waiting for client headers", csp->cfd);
2549          return JB_ERR_PARSE;
2550       }
2551       len = ssl_recv_data(&(csp->ssl_client_attr),
2552          (unsigned char *)buf, sizeof(buf));
2553       if (len == 0)
2554       {
2555          log_error(LOG_LEVEL_CONNECT,
2556             "Socket %d closed while waiting for client headers", csp->cfd);
2557          return JB_ERR_PARSE;
2558       }
2559       if (len == -1)
2560       {
2561          return JB_ERR_PARSE;
2562       }
2563       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2564       {
2565          return JB_ERR_MEMORY;
2566       }
2567       p = strstr(csp->client_iob->cur, "\r\n\r\n");
2568    } while (p == NULL);
2569
2570    log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2571
2572    return JB_ERR_OK;
2573 }
2574
2575
2576 /*********************************************************************
2577  *
2578  * Function    :  change_encrypted_request_destination
2579  *
2580  * Description :  Parse a (rewritten) request line from an encrypted
2581  *                request and regenerate the http request data.
2582  *
2583  * Parameters  :
2584  *          1  :  csp = Current client state (buffers, headers, etc...)
2585  *
2586  * Returns     :  Forwards the parse_http_request() return code.
2587  *                Terminates in case of memory problems.
2588  *
2589  *********************************************************************/
2590 static jb_err change_encrypted_request_destination(struct client_state *csp)
2591 {
2592    jb_err err;
2593    char *original_host = csp->http->host;
2594    int original_port = csp->http->port;
2595
2596    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
2597       csp->https_headers->first->str);
2598    csp->http->host = NULL;
2599    free_http_request(csp->http);
2600    err = parse_http_request(csp->https_headers->first->str, csp->http);
2601    if (JB_ERR_OK != err)
2602    {
2603       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2604          jb_err_to_string(err));
2605       freez(original_host);
2606       return err;
2607    }
2608
2609    if (csp->http->host == NULL)
2610    {
2611       char port_string[10];
2612       /*
2613        * The rewritten request line did not specify a host
2614        * which means we can use the original host specified
2615        * by the client.
2616        */
2617       csp->http->host = original_host;
2618       csp->http->port = original_port;
2619       log_error(LOG_LEVEL_REDIRECTS, "Keeping the original host: %s",
2620          csp->http->host);
2621       /*
2622        * If the rewritten request line didn't contain a host
2623        * it also didn't contain a port so we can reuse the host
2624        * port.
2625        */
2626       freez(csp->http->hostport);
2627       csp->http->hostport = strdup_or_die(csp->http->host);
2628       snprintf(port_string, sizeof(port_string), ":%d", original_port);
2629       err = string_append(&csp->http->hostport, port_string);
2630       if (err != JB_ERR_OK)
2631       {
2632          log_error(LOG_LEVEL_ERROR, "Failed to rebuild hostport: %s.",
2633             jb_err_to_string(err));
2634          return err;
2635       }
2636
2637       /*
2638        * While the request line didn't mention it,
2639        * we're https-inspecting and want to speak TLS
2640        * with the server.
2641        */
2642       csp->http->server_ssl = 1;
2643       csp->http->ssl = 1;
2644    }
2645    else
2646    {
2647       /* The rewrite filter added a host so we can ditch the original */
2648       freez(original_host);
2649       csp->http->server_ssl = csp->http->ssl;
2650    }
2651
2652    csp->http->client_ssl = 1;
2653
2654    freez(csp->https_headers->first->str);
2655    build_request_line(csp, NULL, &csp->https_headers->first->str);
2656
2657    if (!server_use_ssl(csp))
2658    {
2659       log_error(LOG_LEVEL_REDIRECTS,
2660          "Rewritten request line results in downgrade to http");
2661       /*
2662        * Replace the unencryptd headers received with the
2663        * CONNECT request with the ones we received securely.
2664        */
2665       destroy_list(csp->headers);
2666       csp->headers->first = csp->https_headers->first;
2667       csp->headers->last  = csp->https_headers->last;
2668       csp->https_headers->first = NULL;
2669       csp->https_headers->last = NULL;
2670    }
2671
2672    return JB_ERR_OK;
2673
2674 }
2675
2676
2677 /*********************************************************************
2678  *
2679  * Function    :  process_encrypted_request
2680  *
2681  * Description :  Receives and parses an encrypted request.
2682  *
2683  * Parameters  :
2684  *          1  :  csp = Current client state (buffers, headers, etc...)
2685  *
2686  * Returns     :  JB_ERR_OK on success,
2687  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2688  *
2689  *********************************************************************/
2690 static jb_err process_encrypted_request(struct client_state *csp)
2691 {
2692    char *p;
2693    char *request_line;
2694    jb_err err;
2695    /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2696    struct list header_list;
2697    struct list *headers = &header_list;
2698
2699    assert(csp->ssl_with_client_is_opened);
2700
2701 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2702    if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2703    {
2704       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2705    }
2706 #endif
2707    err = receive_encrypted_request_headers(csp);
2708    if (err != JB_ERR_OK)
2709    {
2710       if (csp->client_iob->cur == NULL ||
2711           csp->client_iob->cur == csp->client_iob->eod)
2712       {
2713          /*
2714           * We did not receive any data, most likely because the
2715           * client is done. Don't log this as a parse failure.
2716           */
2717          return JB_ERR_PARSE;
2718       }
2719       /* XXX: Also used for JB_ERR_MEMORY */
2720       log_error(LOG_LEVEL_ERROR, "Failed to receive encrypted request: %s",
2721          jb_err_to_string(err));
2722       ssl_send_data_delayed(&(csp->ssl_client_attr),
2723          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2724       return err;
2725    }
2726
2727    /* We don't need get_request_line() because the whole HTTP head is buffered. */
2728    request_line = get_header(csp->client_iob);
2729    if (request_line == NULL)
2730    {
2731       log_error(LOG_LEVEL_ERROR, "Failed to get the encrypted request line");
2732       ssl_send_data_delayed(&(csp->ssl_client_attr),
2733          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2734       return JB_ERR_PARSE;
2735    }
2736    assert(*request_line != '\0');
2737
2738    if (client_protocol_is_unsupported(csp, request_line))
2739    {
2740       /*
2741        * If the protocol is unsupported we're done here.
2742        * client_protocol_is_unsupported() took care of sending
2743        * the error response and logging the error message.
2744        */
2745       return JB_ERR_PARSE;
2746    }
2747
2748 #ifdef FEATURE_FORCE_LOAD
2749    if (force_required(csp, request_line))
2750    {
2751       csp->flags |= CSP_FLAG_FORCED;
2752    }
2753 #endif /* def FEATURE_FORCE_LOAD */
2754
2755    free_http_request(csp->http);
2756
2757    err = parse_http_request(request_line, csp->http);
2758    /* XXX: Restore ssl setting. This is ugly */
2759    csp->http->client_ssl = 1;
2760    csp->http->server_ssl = 1;
2761
2762    freez(request_line);
2763    if (JB_ERR_OK != err)
2764    {
2765       ssl_send_data_delayed(&(csp->ssl_client_attr),
2766          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2767       /* XXX: Use correct size */
2768       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2769       log_error(LOG_LEVEL_ERROR,
2770          "Couldn't parse request line received from %s: %s",
2771          csp->ip_addr_str, jb_err_to_string(err));
2772
2773       free_http_request(csp->http);
2774       return JB_ERR_PARSE;
2775    }
2776
2777    /* Parse the rest of the client's headers. */
2778    init_list(headers);
2779    for (;;)
2780    {
2781       p = get_header(csp->client_iob);
2782
2783       if (p == NULL)
2784       {
2785          /* There are no additional headers to read. */
2786          break;
2787       }
2788       enlist(headers, p);
2789       freez(p);
2790    }
2791
2792    if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2793    {
2794       /*
2795        * Our attempts to get the request destination
2796        * elsewhere failed.
2797        */
2798       log_error(LOG_LEVEL_ERROR,
2799          "Failed to get the encrypted request destination");
2800       ssl_send_data_delayed(&(csp->ssl_client_attr),
2801          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2802       return JB_ERR_PARSE;
2803    }
2804
2805    /* Split the domain we just got for pattern matching */
2806    init_domain_components(csp->http);
2807
2808 #ifdef FEATURE_CLIENT_TAGS
2809    /* XXX: If the headers were enlisted sooner, passing csp would do. */
2810    if (csp->client_address == NULL)
2811    {
2812       set_client_address(csp, headers);
2813       get_tag_list_for_client(csp->client_tags, csp->client_address);
2814    }
2815 #endif
2816
2817 #ifdef FEATURE_TOGGLE
2818    if ((csp->flags & CSP_FLAG_TOGGLED_ON) != 0)
2819 #endif
2820    {
2821       /*
2822        * Determine the actions for this request after
2823        * clearing the ones from the previous one.
2824        */
2825       free_current_action(csp->action);
2826       get_url_actions(csp, csp->http);
2827    }
2828
2829    enlist(csp->https_headers, csp->http->cmd);
2830
2831    /* Append the previously read headers */
2832    err = list_append_list_unique(csp->https_headers, headers);
2833    destroy_list(headers);
2834    if (JB_ERR_OK != err)
2835    {
2836       /* XXX: Send error message */
2837       return err;
2838    }
2839
2840    /* XXX: Work around crash */
2841    csp->error_message = NULL;
2842
2843    /* XXX: Why do this here? */
2844    csp->http->ssl = 1;
2845
2846    err = sed_https(csp);
2847    if (JB_ERR_OK != err)
2848    {
2849       ssl_send_data_delayed(&(csp->ssl_client_attr),
2850          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2851       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2852          csp->ip_addr_str);
2853       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2854          csp->ip_addr_str, csp->http->cmd);
2855       return JB_ERR_PARSE;
2856    }
2857
2858    if ((NULL == csp->https_headers->first->str)
2859       || (strcmp(csp->http->cmd, csp->https_headers->first->str) &&
2860          (JB_ERR_OK != change_encrypted_request_destination(csp))))
2861    {
2862       ssl_send_data_delayed(&(csp->ssl_client_attr),
2863          (const unsigned char *)MESSED_UP_REQUEST_RESPONSE,
2864          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2865       log_error(LOG_LEVEL_ERROR,
2866          "Invalid request line after applying header filters.");
2867       /* XXX: Use correct size */
2868       log_error(LOG_LEVEL_CLF,
2869          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2870
2871       return JB_ERR_PARSE;
2872    }
2873
2874    log_error(LOG_LEVEL_HEADER, "Encrypted request processed");
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_applied_actions(csp->action);
2981
2982    log_error(LOG_LEVEL_CONNECT,
2983       "Reusing server socket %d connected to %s. Requests already sent: %u.",
2984       csp->server_connection.sfd, csp->server_connection.host,
2985       csp->server_connection.requests_sent_total);
2986
2987    if (send_https_request(csp))
2988    {
2989       /*
2990        * Most likely the server connection timed out. We can't easily
2991        * create a new one so simply drop the client connection without a
2992        * error response to let the client retry.
2993        */
2994       log_error(LOG_LEVEL_CONNECT,
2995          "Dropping client connection on socket %d. "
2996          "Forwarding the encrypted client request failed.",
2997          csp->cfd);
2998       return;
2999    }
3000    csp->server_connection.request_sent = time(NULL);
3001    csp->server_connection.requests_sent_total++;
3002    handle_established_connection(csp);
3003    freez(csp->receive_buffer);
3004 }
3005 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3006 #endif
3007
3008
3009 /*********************************************************************
3010  *
3011  * Function    :  handle_established_connection
3012  *
3013  * Description :  Shuffle data between client and server once the
3014  *                connection has been established and the request
3015  *                has been sent.
3016  *
3017  * Parameters  :
3018  *          1  :  csp = Current client state (buffers, headers, etc...)
3019  *
3020  * Returns     :  Nothing.
3021  *
3022  *********************************************************************/
3023 static void handle_established_connection(struct client_state *csp)
3024 {
3025    char *hdr;
3026    char *p;
3027    int n;
3028 #ifdef HAVE_POLL
3029    struct pollfd poll_fds[2];
3030 #else
3031    fd_set rfds;
3032    jb_socket maxfd;
3033    struct timeval timeout;
3034 #endif
3035    int server_body;
3036    int ms_iis5_hack = 0;
3037    unsigned long long byte_count = 0;
3038    struct http_request *http;
3039    long len = 0; /* for buffer sizes (and negative error codes) */
3040    int buffer_and_filter_content = 0;
3041    unsigned int write_delay;
3042 #ifdef FEATURE_HTTPS_INSPECTION
3043    int ret = 0;
3044    int use_ssl_tunnel = 0;
3045    csp->dont_verify_certificate = 0;
3046
3047    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION))
3048    {
3049       /* Pass encrypted content without filtering. */
3050       use_ssl_tunnel = 1;
3051    }
3052 #endif
3053
3054    /* Skeleton for HTTP response, if we should intercept the request */
3055    struct http_response *rsp;
3056 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3057    int watch_client_socket;
3058 #endif
3059
3060    csp->receive_buffer_size = csp->config->receive_buffer_size;
3061    csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
3062    if (csp->receive_buffer == NULL)
3063    {
3064       log_error(LOG_LEVEL_ERROR,
3065          "Out of memory. Failed to allocate the receive buffer.");
3066       rsp = cgi_error_memory();
3067       send_crunch_response(csp, rsp);
3068       return;
3069    }
3070
3071    http = csp->http;
3072
3073 #ifndef HAVE_POLL
3074    maxfd = (csp->cfd > csp->server_connection.sfd) ?
3075       csp->cfd : csp->server_connection.sfd;
3076 #endif
3077
3078    /* pass data between the client and server
3079     * until one or the other shuts down the connection.
3080     */
3081
3082    server_body = 0;
3083
3084 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3085    watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
3086 #endif
3087    write_delay = get_write_delay(csp);
3088
3089    for (;;)
3090    {
3091 #ifdef FEATURE_HTTPS_INSPECTION
3092       if (server_use_ssl(csp) && is_ssl_pending(&(csp->ssl_server_attr)))
3093       {
3094          /*
3095           * It's possible that the TLS library already consumed all the
3096           * data the server intends to send. If that happens poll() and
3097           * select() will no longer see the data as available so we have
3098           * to skip the calls.
3099           */
3100          goto server_wants_to_talk;
3101       }
3102 #endif
3103 #ifndef HAVE_POLL
3104       FD_ZERO(&rfds);
3105 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3106       if (!watch_client_socket)
3107       {
3108          maxfd = csp->server_connection.sfd;
3109       }
3110       else
3111 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3112       {
3113          FD_SET(csp->cfd, &rfds);
3114       }
3115
3116       FD_SET(csp->server_connection.sfd, &rfds);
3117 #endif /* ndef HAVE_POLL */
3118
3119 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3120       if ((csp->flags & CSP_FLAG_CHUNKED)
3121          && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3122          && ((csp->iob->eod - csp->iob->cur) >= 5)
3123          && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3124       {
3125          /*
3126           * XXX: This check should be obsolete now,
3127           *      but let's wait a while to be sure.
3128           */
3129          log_error(LOG_LEVEL_CONNECT,
3130             "Looks like we got the last chunk together with "
3131             "the server headers but didn't detect it earlier. "
3132             "We better stop reading.");
3133          byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3134          csp->expected_content_length = byte_count;
3135          csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3136       }
3137       if (server_body && server_response_is_complete(csp, byte_count))
3138       {
3139          if (csp->expected_content_length == byte_count)
3140          {
3141             log_error(LOG_LEVEL_CONNECT,
3142                "Done reading from server. Content length: %llu as expected. "
3143                "Bytes most recently read: %ld.",
3144                byte_count, len);
3145          }
3146          else
3147          {
3148             log_error(LOG_LEVEL_CONNECT,
3149                "Done reading from server. Expected content length: %llu. "
3150                "Actual content length: %llu. Bytes most recently read: %ld.",
3151                csp->expected_content_length, byte_count, len);
3152          }
3153          len = 0;
3154          /*
3155           * XXX: Should not jump around, handle_established_connection()
3156           * is complicated enough already.
3157           */
3158          goto reading_done;
3159       }
3160 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3161
3162 #ifdef HAVE_POLL
3163       poll_fds[0].fd = csp->cfd;
3164 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3165       if (!watch_client_socket)
3166       {
3167          /*
3168           * Ignore incoming data, but still watch out
3169           * for disconnects etc. These flags are always
3170           * implied anyway but explicitly setting them
3171           * doesn't hurt.
3172           */
3173          poll_fds[0].events = POLLERR|POLLHUP;
3174       }
3175       else
3176 #endif
3177       {
3178          poll_fds[0].events = POLLIN;
3179       }
3180       poll_fds[1].fd = csp->server_connection.sfd;
3181       poll_fds[1].events = POLLIN;
3182       n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
3183 #else
3184       timeout.tv_sec = csp->config->socket_timeout;
3185       timeout.tv_usec = 0;
3186       n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
3187 #endif /* def HAVE_POLL */
3188
3189       /* Server or client not responding in timeout */
3190       if (n == 0)
3191       {
3192          log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
3193             csp->config->socket_timeout, http->url);
3194          if ((byte_count == 0) && (http->ssl == 0))
3195          {
3196             send_crunch_response(csp, error_response(csp, "connection-timeout"));
3197          }
3198          mark_server_socket_tainted(csp);
3199 #ifdef FEATURE_HTTPS_INSPECTION
3200          close_client_and_server_ssl_connections(csp);
3201 #endif
3202          return;
3203       }
3204       else if (n < 0)
3205       {
3206 #ifdef HAVE_POLL
3207          log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
3208 #else
3209          log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
3210 #endif
3211          mark_server_socket_tainted(csp);
3212 #ifdef FEATURE_HTTPS_INSPECTION
3213          close_client_and_server_ssl_connections(csp);
3214 #endif
3215          return;
3216       }
3217
3218       /*
3219        * This is the body of the browser's request,
3220        * just read and write it.
3221        *
3222        * Receives data from browser and sends it to server
3223        *
3224        * XXX: Make sure the client doesn't use pipelining
3225        * behind Privoxy's back.
3226        */
3227 #ifdef HAVE_POLL
3228       if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
3229       {
3230          log_error(LOG_LEVEL_CONNECT,
3231             "The client socket %d has become unusable while "
3232             "the server socket %d is still open.",
3233             csp->cfd, csp->server_connection.sfd);
3234          mark_server_socket_tainted(csp);
3235          break;
3236       }
3237
3238       if (poll_fds[0].revents != 0)
3239 #else
3240       if (FD_ISSET(csp->cfd, &rfds))
3241 #endif /* def HAVE_POLL*/
3242       {
3243          int max_bytes_to_read = (int)csp->receive_buffer_size;
3244
3245 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3246          if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
3247          {
3248             if (data_is_available(csp->cfd, 0))
3249             {
3250                /*
3251                 * If the next request is already waiting, we have
3252                 * to stop select()ing the client socket. Otherwise
3253                 * we would always return right away and get nothing
3254                 * else done.
3255                 */
3256                watch_client_socket = 0;
3257                log_error(LOG_LEVEL_CONNECT,
3258                   "Stop watching client socket %d. "
3259                   "There's already another request waiting.",
3260                   csp->cfd);
3261                continue;
3262             }
3263             /*
3264              * If the client socket is set, but there's no data
3265              * available on the socket, the client went fishing
3266              * and continuing talking to the server makes no sense.
3267              */
3268             log_error(LOG_LEVEL_CONNECT,
3269                "The client closed socket %d while "
3270                "the server socket %d is still open.",
3271                csp->cfd, csp->server_connection.sfd);
3272             mark_server_socket_tainted(csp);
3273             break;
3274          }
3275          if (csp->expected_client_content_length != 0)
3276          {
3277             if (csp->expected_client_content_length < csp->receive_buffer_size)
3278             {
3279                max_bytes_to_read = (int)csp->expected_client_content_length;
3280             }
3281             log_error(LOG_LEVEL_CONNECT,
3282                "Waiting for up to %d bytes from the client.",
3283                max_bytes_to_read);
3284          }
3285          assert(max_bytes_to_read <= csp->receive_buffer_size);
3286 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3287
3288 #ifdef FEATURE_HTTPS_INSPECTION
3289          if (client_use_ssl(csp))
3290          {
3291             if (csp->http->status == 101)
3292             {
3293                len = ssl_recv_data(&(csp->ssl_client_attr),
3294                   (unsigned char *)csp->receive_buffer,
3295                   (size_t)max_bytes_to_read);
3296                if (len == -1)
3297                {
3298                   log_error(LOG_LEVEL_ERROR, "Failed to receive data "
3299                      "on client socket %d for an upgraded connection",
3300                      csp->cfd);
3301                   break;
3302                }
3303                if (len == 0)
3304                {
3305                   log_error(LOG_LEVEL_CONNECT, "Done receiving data "
3306                      "on client socket %d for an upgraded connection",
3307                      csp->cfd);
3308                   break;
3309                }
3310                byte_count += (unsigned long long)len;
3311                len = ssl_send_data(&(csp->ssl_server_attr),
3312                   (unsigned char *)csp->receive_buffer, (size_t)len);
3313                if (len == -1)
3314                {
3315                   log_error(LOG_LEVEL_ERROR, "Failed to send data "
3316                      "on server socket %d for an upgraded connection",
3317                      csp->server_connection.sfd);
3318                   break;
3319                }
3320                continue;
3321             }
3322             log_error(LOG_LEVEL_CONNECT, "Breaking with TLS/SSL.");
3323             break;
3324          }
3325          else
3326 #endif /* def FEATURE_HTTPS_INSPECTION */
3327          {
3328             len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
3329
3330             if (len <= 0)
3331             {
3332                /* XXX: not sure if this is necessary. */
3333                mark_server_socket_tainted(csp);
3334                break; /* "game over, man" */
3335             }
3336
3337 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3338             if (csp->expected_client_content_length != 0)
3339             {
3340                assert(len <= max_bytes_to_read);
3341                csp->expected_client_content_length -= (unsigned)len;
3342                log_error(LOG_LEVEL_CONNECT,
3343                   "Expected client content length set to %llu "
3344                   "after reading %ld bytes.",
3345                   csp->expected_client_content_length, len);
3346                if (csp->expected_client_content_length == 0)
3347                {
3348                   log_error(LOG_LEVEL_CONNECT,
3349                      "Done reading from the client.");
3350                   csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
3351                }
3352             }
3353 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3354
3355             if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
3356             {
3357                log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
3358                mark_server_socket_tainted(csp);
3359                return;
3360             }
3361          }
3362          continue;
3363       }
3364
3365       /*
3366        * The server wants to talk. It could be the header or the body.
3367        * If `hdr' is null, then it's the header otherwise it's the body.
3368        * FIXME: Does `hdr' really mean `host'? No.
3369        */
3370 #ifdef HAVE_POLL
3371       if (poll_fds[1].revents != 0)
3372 #else
3373       if (FD_ISSET(csp->server_connection.sfd, &rfds))
3374 #endif /* HAVE_POLL */
3375       {
3376 #ifdef FEATURE_HTTPS_INSPECTION
3377          server_wants_to_talk:
3378 #endif
3379 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3380          /*
3381           * If we are buffering content, we don't want to eat up to
3382           * buffer-limit bytes if the client no longer cares about them.
3383           * If we aren't buffering, however, a dead client socket will be
3384           * noticed pretty much right away anyway, so we can reduce the
3385           * overhead by skipping the check.
3386           */
3387          if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
3388          {
3389 #ifdef _WIN32
3390             log_error(LOG_LEVEL_CONNECT,
3391                "The server still wants to talk, but the client may already have hung up on us.");
3392 #else
3393             log_error(LOG_LEVEL_CONNECT,
3394                "The server still wants to talk, but the client hung up on us.");
3395             mark_server_socket_tainted(csp);
3396 #ifdef FEATURE_HTTPS_INSPECTION
3397             close_client_and_server_ssl_connections(csp);
3398 #endif
3399             return;
3400 #endif /* def _WIN32 */
3401          }
3402 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3403
3404 #ifdef FEATURE_HTTPS_INSPECTION
3405          /*
3406           * Reading data from standard or secured connection (HTTP/HTTPS)
3407           */
3408          if (server_use_ssl(csp))
3409          {
3410             len = ssl_recv_data(&(csp->ssl_server_attr),
3411                (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
3412          }
3413          else
3414 #endif
3415          {
3416             len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
3417                (int)csp->receive_buffer_size);
3418          }
3419
3420          if (len < 0)
3421          {
3422             log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
3423
3424             if ((http->ssl && (csp->fwd == NULL))
3425 #ifdef FEATURE_HTTPS_INSPECTION
3426                && use_ssl_tunnel
3427 #endif
3428                 )
3429             {
3430                /*
3431                 * Just hang up. We already confirmed the client's CONNECT
3432                 * request with status code 200 and unencrypted content is
3433                 * no longer welcome.
3434                 */
3435                log_error(LOG_LEVEL_ERROR,
3436                   "CONNECT already confirmed. Unable to tell the client about the problem.");
3437                return;
3438             }
3439             else if (byte_count)
3440             {
3441                /*
3442                 * Just hang up. We already transmitted the original headers
3443                 * and parts of the original content and therefore missed the
3444                 * chance to send an error message (without risking data corruption).
3445                 *
3446                 * XXX: we could retry with a fancy range request here.
3447                 */
3448                log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
3449                   "Unable to tell the client about the problem.");
3450                mark_server_socket_tainted(csp);
3451 #ifdef FEATURE_HTTPS_INSPECTION
3452                close_client_and_server_ssl_connections(csp);
3453 #endif
3454                return;
3455             }
3456             /*
3457              * XXX: Consider handling the cases above the same.
3458              */
3459             mark_server_socket_tainted(csp);
3460             len = 0;
3461          }
3462
3463 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3464          if (csp->flags & CSP_FLAG_CHUNKED)
3465          {
3466             if ((len >= 5) && !memcmp(csp->receive_buffer+len-5, "0\r\n\r\n", 5))
3467             {
3468                /* XXX: this is a temporary hack */
3469                log_error(LOG_LEVEL_CONNECT,
3470                   "Looks like we reached the end of the last chunk. "
3471                   "We better stop reading.");
3472                csp->expected_content_length = byte_count + (unsigned long long)len;
3473                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3474             }
3475          }
3476          reading_done:
3477 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3478
3479          /*
3480           * This is guaranteed by allocating with zalloc_or_die()
3481           * and never (intentionally) writing to the last byte.
3482           *
3483           * csp->receive_buffer_size is the size of the part of the
3484           * buffer we intentionally write to, but we actually
3485           * allocated csp->receive_buffer_size+1 bytes so the assertion
3486           * stays within the allocated range.
3487           */
3488          assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
3489
3490          /*
3491           * Add a trailing zero to let be able to use string operations.
3492           * XXX: do we still need this with filter_popups gone?
3493           */
3494          assert(len <= csp->receive_buffer_size);
3495          csp->receive_buffer[len] = '\0';
3496
3497          /*
3498           * Normally, this would indicate that we've read
3499           * as much as the server has sent us and we can
3500           * close the client connection.  However, Microsoft
3501           * in its wisdom has released IIS/5 with a bug that
3502           * prevents it from sending the trailing \r\n in
3503           * a 302 redirect header (and possibly other headers).
3504           * To work around this if we've haven't parsed
3505           * a full header we'll append a trailing \r\n
3506           * and see if this now generates a valid one.
3507           *
3508           * This hack shouldn't have any impacts.  If we've
3509           * already transmitted the header or if this is a
3510           * SSL connection, then we won't bother with this
3511           * hack.  So we only work on partially received
3512           * headers.  If we append a \r\n and this still
3513           * doesn't generate a valid header, then we won't
3514           * transmit anything to the client.
3515           */
3516          if (len == 0)
3517          {
3518
3519             if (server_body || (http->ssl
3520 #ifdef FEATURE_HTTPS_INSPECTION
3521                   && use_ssl_tunnel
3522 #endif
3523                ))
3524             {
3525                /*
3526                 * If we have been buffering up the document,
3527                 * now is the time to apply content modification
3528                 * and send the result to the client.
3529                 */
3530                if (buffer_and_filter_content)
3531                {
3532                   p = execute_content_filters(csp);
3533                   /*
3534                    * If content filtering fails, use the original
3535                    * buffer and length.
3536                    * (see p != NULL ? p : csp->iob->cur below)
3537                    */
3538                   if (NULL == p)
3539                   {
3540                      csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3541                   }
3542 #ifdef FEATURE_COMPRESSION
3543                   else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
3544                      && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
3545                   {
3546                      char *compressed_content = compress_buffer(p,
3547                         (size_t *)&csp->content_length, csp->config->compression_level);
3548                      if (compressed_content != NULL)
3549                      {
3550                         freez(p);
3551                         p = compressed_content;
3552                         csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
3553                      }
3554                   }
3555 #endif
3556
3557                   if (JB_ERR_OK != update_server_headers(csp))
3558                   {
3559                      log_error(LOG_LEVEL_FATAL,
3560                         "Failed to update server headers. after filtering.");
3561                   }
3562
3563                   hdr = list_to_text(csp->headers);
3564                   if (hdr == NULL)
3565                   {
3566                      /* FIXME Should handle error properly */
3567                      log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3568                   }
3569
3570 #ifdef FEATURE_HTTPS_INSPECTION
3571                   /*
3572                    * Sending data with standard or secured connection (HTTP/HTTPS)
3573                    */
3574                   if (client_use_ssl(csp))
3575                   {
3576                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3577                               (const unsigned char *)hdr, strlen(hdr),
3578                               get_write_delay(csp)) < 0)
3579                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3580                               (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
3581                               csp->content_length, get_write_delay(csp)) < 0))
3582                      {
3583                         log_error(LOG_LEVEL_ERROR,
3584                            "Failed to send the modified content to the client over TLS");
3585                         freez(hdr);
3586                         freez(p);
3587                         mark_server_socket_tainted(csp);
3588                         close_client_and_server_ssl_connections(csp);
3589                         return;
3590                      }
3591                   }
3592                   else
3593 #endif /* def FEATURE_HTTPS_INSPECTION */
3594                   {
3595                      if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3596                       || write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
3597                          (size_t)csp->content_length, write_delay))
3598                      {
3599                         log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3600                         freez(hdr);
3601                         freez(p);
3602                         mark_server_socket_tainted(csp);
3603                         return;
3604                      }
3605                   }
3606
3607                   freez(hdr);
3608                   freez(p);
3609                }
3610
3611                break; /* "game over, man" */
3612             }
3613
3614             /*
3615              * This is not the body, so let's pretend the server just sent
3616              * us a blank line.
3617              */
3618             snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
3619             len = (int)strlen(csp->receive_buffer);
3620
3621             /*
3622              * Now, let the normal header parsing algorithm below do its
3623              * job.  If it fails, we'll exit instead of continuing.
3624              */
3625
3626             ms_iis5_hack = 1;
3627          }
3628
3629          /*
3630           * If we're in the body of the server document, just write it to
3631           * the client, unless we need to buffer the body for later
3632           * content-filtering.
3633           */
3634          if (server_body || (http->ssl
3635 #ifdef FEATURE_HTTPS_INSPECTION
3636                && use_ssl_tunnel
3637 #endif
3638             ))
3639          {
3640             if (buffer_and_filter_content)
3641             {
3642                /*
3643                 * If there is no memory left for buffering the content, or the buffer limit
3644                 * has been reached, switch to non-filtering mode, i.e. make & write the
3645                 * header, flush the iob and buf, and get out of the way.
3646                 */
3647                if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3648                {
3649                   size_t hdrlen;
3650                   long flushed;
3651
3652                   log_error(LOG_LEVEL_INFO,
3653                      "Flushing header and buffers. Stepping back from filtering.");
3654
3655                   hdr = list_to_text(csp->headers);
3656                   if (hdr == NULL)
3657                   {
3658                      /*
3659                       * Memory is too tight to even generate the header.
3660                       * Send our static "Out-of-memory" page.
3661                       */
3662                      log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3663                      rsp = cgi_error_memory();
3664                      send_crunch_response(csp, rsp);
3665                      mark_server_socket_tainted(csp);
3666 #ifdef FEATURE_HTTPS_INSPECTION
3667                      close_client_and_server_ssl_connections(csp);
3668 #endif
3669                      return;
3670                   }
3671                   hdrlen = strlen(hdr);
3672
3673 #ifdef FEATURE_HTTPS_INSPECTION
3674                   /*
3675                    * Sending data with standard or secured connection (HTTP/HTTPS)
3676                    */
3677                   if (client_use_ssl(csp))
3678                   {
3679                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3680                              (const unsigned char *)hdr, hdrlen, get_write_delay(csp)) < 0)
3681                         || ((flushed = ssl_flush_socket(&(csp->ssl_client_attr),
3682                                 csp->iob)) < 0)
3683                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3684                               (const unsigned char *)csp->receive_buffer, (size_t)len,
3685                               get_write_delay(csp)) < 0))
3686                      {
3687                         log_error(LOG_LEVEL_CONNECT,
3688                            "Flush header and buffers to client failed");
3689                         freez(hdr);
3690                         mark_server_socket_tainted(csp);
3691                         close_client_and_server_ssl_connections(csp);
3692                         return;
3693                      }
3694                   }
3695                   else
3696 #endif /* def FEATURE_HTTPS_INSPECTION */
3697                   {
3698                      if (write_socket_delayed(csp->cfd, hdr, hdrlen, write_delay)
3699                       || ((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3700                       || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3701                             write_delay))
3702                      {
3703                         log_error(LOG_LEVEL_CONNECT,
3704                            "Flush header and buffers to client failed: %E");
3705                         freez(hdr);
3706                         mark_server_socket_tainted(csp);
3707                         return;
3708                      }
3709                   }
3710
3711                   /*
3712                    * Reset the byte_count to the amount of bytes
3713                    * we just flushed. len will be added a few lines below,
3714                    * hdrlen doesn't matter for LOG_LEVEL_CLF.
3715                    */
3716                   byte_count = (unsigned long long)flushed;
3717                   freez(hdr);
3718                   buffer_and_filter_content = 0;
3719                   server_body = 1;
3720                }
3721             }
3722             else
3723             {
3724 #ifdef FEATURE_HTTPS_INSPECTION
3725                /*
3726                 * Sending data with standard or secured connection (HTTP/HTTPS)
3727                 */
3728                if (client_use_ssl(csp))
3729                {
3730                   ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3731                      (const unsigned char *)csp->receive_buffer, (size_t)len,
3732                      get_write_delay(csp));
3733                   if (ret < 0)
3734                   {
3735                      log_error(LOG_LEVEL_ERROR,
3736                         "Sending data to client failed");
3737                      mark_server_socket_tainted(csp);
3738                      close_client_and_server_ssl_connections(csp);
3739                      return;
3740                   }
3741                }
3742                else
3743 #endif /* def FEATURE_HTTPS_INSPECTION */
3744                {
3745                   if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3746                         (size_t)len, write_delay))
3747                   {
3748                      log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3749                      mark_server_socket_tainted(csp);
3750                      return;
3751                   }
3752                }
3753             }
3754             byte_count += (unsigned long long)len;
3755             continue;
3756          }
3757          else
3758          {
3759             /*
3760              * We're still looking for the end of the server's header.
3761              * Buffer up the data we just read.  If that fails, there's
3762              * little we can do but send our static out-of-memory page.
3763              */
3764             if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3765             {
3766                log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3767                rsp = cgi_error_memory();
3768                send_crunch_response(csp, rsp);
3769                mark_server_socket_tainted(csp);
3770 #ifdef FEATURE_HTTPS_INSPECTION
3771                close_client_and_server_ssl_connections(csp);
3772 #endif
3773                return;
3774             }
3775
3776             /* Convert iob into something sed() can digest */
3777             if (JB_ERR_PARSE == get_server_headers(csp))
3778             {
3779                if (ms_iis5_hack)
3780                {
3781                   /*
3782                    * Well, we tried our MS IIS/5 hack and it didn't work.
3783                    * The header is incomplete and there isn't anything
3784                    * we can do about it.
3785                    */
3786                   log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3787                      "Applying the MS IIS5 hack didn't help.");
3788                   log_error(LOG_LEVEL_CLF,
3789                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3790 #ifdef FEATURE_HTTPS_INSPECTION
3791                   /*
3792                    * Sending data with standard or secured connection (HTTP/HTTPS)
3793                    */
3794                   if (client_use_ssl(csp))
3795                   {
3796                      ssl_send_data_delayed(&(csp->ssl_client_attr),
3797                         (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3798                         strlen(INVALID_SERVER_HEADERS_RESPONSE), get_write_delay(csp));
3799                   }
3800                   else
3801 #endif /* def FEATURE_HTTPS_INSPECTION */
3802                   {
3803                      write_socket_delayed(csp->cfd,
3804                         INVALID_SERVER_HEADERS_RESPONSE,
3805                         strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3806                   }
3807                   mark_server_socket_tainted(csp);
3808 #ifdef FEATURE_HTTPS_INSPECTION
3809                   close_client_and_server_ssl_connections(csp);
3810 #endif
3811                   return;
3812                }
3813                else
3814                {
3815                   /*
3816                    * Since we have to wait for more from the server before
3817                    * we can parse the headers we just continue here.
3818                    */
3819                   log_error(LOG_LEVEL_CONNECT,
3820                      "Continuing buffering server headers from socket %d. "
3821                      "Bytes most recently read: %ld.", csp->cfd, len);
3822                   continue;
3823                }
3824             }
3825             else
3826             {
3827                /*
3828                 * Account for the content bytes we
3829                 * might have gotten with the headers.
3830                 */
3831                assert(csp->iob->eod >= csp->iob->cur);
3832                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3833             }
3834
3835             /* Did we actually get anything? */
3836             if (NULL == csp->headers->first)
3837             {
3838                if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
3839                {
3840                   log_error(LOG_LEVEL_ERROR,
3841                      "No server or forwarder response received on socket %d. "
3842                      "Closing client socket %d without sending data.",
3843                      csp->server_connection.sfd, csp->cfd);
3844                   log_error(LOG_LEVEL_CLF,
3845                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3846                }
3847                else
3848                {
3849                   log_error(LOG_LEVEL_ERROR,
3850                      "No server or forwarder response received on socket %d.",
3851                      csp->server_connection.sfd);
3852                   send_crunch_response(csp, error_response(csp, "no-server-data"));
3853                }
3854                free_http_request(http);
3855                mark_server_socket_tainted(csp);
3856 #ifdef FEATURE_HTTPS_INSPECTION
3857                close_client_and_server_ssl_connections(csp);
3858 #endif
3859                return;
3860             }
3861
3862             if (!csp->headers->first->str)
3863             {
3864                log_error(LOG_LEVEL_ERROR, "header search: csp->headers->first->str == NULL, assert will be called");
3865             }
3866             assert(csp->headers->first->str);
3867
3868             if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3869                 strncmpic(csp->headers->first->str, "ICY", 3))
3870             {
3871                /*
3872                 * It doesn't look like a HTTP (or Shoutcast) response:
3873                 * tell the client and log the problem.
3874                 */
3875                if (strlen(csp->headers->first->str) > 30)
3876                {
3877                   csp->headers->first->str[30] = '\0';
3878                }
3879                log_error(LOG_LEVEL_ERROR,
3880                   "Invalid server or forwarder response. Starts with: %s",
3881                   csp->headers->first->str);
3882                log_error(LOG_LEVEL_CLF,
3883                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3884 #ifdef FEATURE_HTTPS_INSPECTION
3885                /*
3886                 * Sending data with standard or secured connection (HTTP/HTTPS)
3887                 */
3888                if (client_use_ssl(csp))
3889                {
3890                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3891                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3892                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3893                      get_write_delay(csp));
3894                }
3895                else
3896 #endif /* def FEATURE_HTTPS_INSPECTION */
3897                {
3898                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3899                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3900                }
3901                free_http_request(http);
3902                mark_server_socket_tainted(csp);
3903 #ifdef FEATURE_HTTPS_INSPECTION
3904                close_client_and_server_ssl_connections(csp);
3905 #endif
3906                return;
3907             }
3908
3909             /*
3910              * Disable redirect checkers, so that they will be only run
3911              * again if the user also enables them through tags.
3912              *
3913              * From a performance point of view it doesn't matter,
3914              * but it prevents duplicated log messages.
3915              */
3916 #ifdef FEATURE_FAST_REDIRECTS
3917             csp->action->flags &= ~ACTION_FAST_REDIRECTS;
3918 #endif
3919             csp->action->flags &= ~ACTION_REDIRECT;
3920
3921             /*
3922              * We have now received the entire server header,
3923              * filter it and send the result to the client
3924              */
3925             if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3926             {
3927                log_error(LOG_LEVEL_CLF,
3928                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3929 #ifdef FEATURE_HTTPS_INSPECTION
3930                /*
3931                 * Sending data with standard or secured connection (HTTP/HTTPS)
3932                 */
3933                if (client_use_ssl(csp))
3934                {
3935                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3936                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3937                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3938                      get_write_delay(csp));
3939                }
3940                else
3941 #endif
3942                {
3943                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3944                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3945                }
3946                free_http_request(http);
3947                mark_server_socket_tainted(csp);
3948 #ifdef FEATURE_HTTPS_INSPECTION
3949                close_client_and_server_ssl_connections(csp);
3950 #endif
3951                return;
3952             }
3953             hdr = list_to_text(csp->headers);
3954             if (hdr == NULL)
3955             {
3956                /* FIXME Should handle error properly */
3957                log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3958             }
3959
3960             if ((csp->flags & CSP_FLAG_CHUNKED)
3961                && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3962                && ((csp->iob->eod - csp->iob->cur) >= 5)
3963                && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3964             {
3965                log_error(LOG_LEVEL_CONNECT,
3966                   "Looks like we got the last chunk together with "
3967                   "the server headers. We better stop reading.");
3968                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3969                csp->expected_content_length = byte_count;
3970                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3971             }
3972
3973             csp->server_connection.response_received = time(NULL);
3974
3975             if (crunch_response_triggered(csp, crunchers_light))
3976             {
3977                /*
3978                 * One of the tags created by a server-header
3979                 * tagger triggered a crunch. We already
3980                 * delivered the crunch response to the client
3981                 * and are done here after cleaning up.
3982                 */
3983                freez(hdr);
3984                mark_server_socket_tainted(csp);
3985 #ifdef FEATURE_HTTPS_INSPECTION
3986                close_client_and_server_ssl_connections(csp);
3987 #endif
3988                return;
3989             }
3990
3991             /* Buffer and pcrs filter this if appropriate. */
3992             buffer_and_filter_content = content_requires_filtering(csp);
3993
3994             if (!buffer_and_filter_content)
3995             {
3996                /*
3997                 * Write the server's (modified) header to
3998                 * the client (along with anything else that
3999                 * may be in the buffer). Use standard or secured
4000                 * connection.
4001                 */
4002 #ifdef FEATURE_HTTPS_INSPECTION
4003                if (client_use_ssl(csp))
4004                {
4005                   if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
4006                           (const unsigned char *)hdr, strlen(hdr),
4007                           get_write_delay(csp)) < 0)
4008                      || ((len = ssl_flush_socket(&(csp->ssl_client_attr),
4009                             csp->iob)) < 0))
4010                   {
4011                      log_error(LOG_LEVEL_CONNECT, "Write header to client failed");
4012
4013                      /*
4014                       * The write failed, so don't bother mentioning it
4015                       * to the client... it probably can't hear us anyway.
4016                       */
4017                      freez(hdr);
4018                      mark_server_socket_tainted(csp);
4019 #ifdef FEATURE_HTTPS_INSPECTION
4020                      close_client_and_server_ssl_connections(csp);
4021 #endif
4022                      return;
4023                   }
4024                }
4025                else
4026 #endif /* def FEATURE_HTTPS_INSPECTION */
4027                {
4028                   if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
4029                      || ((len = flush_iob(csp->cfd, csp->iob, write_delay)) < 0))
4030                   {
4031                      log_error(LOG_LEVEL_ERROR,
4032                         "write header to client failed");
4033                      /*
4034                       * The write failed, so don't bother mentioning it
4035                       * to the client... it probably can't hear us anyway.
4036                       */
4037                      freez(hdr);
4038                      mark_server_socket_tainted(csp);
4039                      return;
4040                   }
4041                }
4042                                 }
4043
4044             /* we're finished with the server's header */
4045
4046             freez(hdr);
4047             server_body = 1;
4048
4049             /*
4050              * If this was a MS IIS/5 hack then it means the server
4051              * has already closed the connection. Nothing more to read.
4052              * Time to bail.
4053              */
4054             if (ms_iis5_hack)
4055             {
4056                log_error(LOG_LEVEL_ERROR,
4057                   "Closed server connection detected. "
4058                   "Applying the MS IIS5 hack didn't help.");
4059                log_error(LOG_LEVEL_CLF,
4060                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
4061 #ifdef FEATURE_HTTPS_INSPECTION
4062                /*
4063                 * Sending data with standard or secured connection (HTTP/HTTPS)
4064                 */
4065                if (client_use_ssl(csp))
4066                {
4067                   ssl_send_data_delayed(&(csp->ssl_client_attr),
4068                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
4069                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
4070                      get_write_delay(csp));
4071                }
4072                else
4073 #endif /* def FEATURE_HTTPS_INSPECTION */
4074                {
4075                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
4076                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
4077                }
4078                mark_server_socket_tainted(csp);
4079 #ifdef FEATURE_HTTPS_INSPECTION
4080                close_client_and_server_ssl_connections(csp);
4081 #endif
4082                return;
4083             }
4084          }
4085          continue;
4086       }
4087       mark_server_socket_tainted(csp);
4088 #ifdef FEATURE_HTTPS_INSPECTION
4089       close_client_and_server_ssl_connections(csp);
4090 #endif
4091       return; /* huh? we should never get here */
4092    }
4093
4094    if (csp->content_length == 0)
4095    {
4096       /*
4097        * If Privoxy didn't recalculate the Content-Length,
4098        * byte_count is still correct.
4099        */
4100       csp->content_length = byte_count;
4101    }
4102
4103 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4104    if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
4105       && (csp->expected_content_length != byte_count))
4106    {
4107       log_error(LOG_LEVEL_CONNECT,
4108          "Received %llu bytes while expecting %llu.",
4109          byte_count, csp->expected_content_length);
4110       mark_server_socket_tainted(csp);
4111    }
4112 #endif
4113
4114 #ifdef FEATURE_HTTPS_INSPECTION
4115    if (client_use_ssl(csp))
4116    {
4117       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" 200 %llu",
4118          csp->ip_addr_str, http->gpc, http->hostport, http->path,
4119          http->version, csp->content_length);
4120    }
4121    else
4122 #endif
4123    {
4124       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
4125          csp->ip_addr_str, http->ocmd, csp->content_length);
4126    }
4127    csp->server_connection.timestamp = time(NULL);
4128 }
4129
4130
4131 /*********************************************************************
4132  *
4133  * Function    :  chat
4134  *
4135  * Description :  Once a connection from the client has been accepted,
4136  *                this function is called (via serve()) to handle the
4137  *                main business of the communication.  This function
4138  *                returns after dealing with a single request. It can
4139  *                be called multiple times with the same client socket
4140  *                if the client is keeping the connection alive.
4141  *
4142  *                The decision whether or not a client connection will
4143  *                be kept alive is up to the caller which also must
4144  *                close the client socket when done.
4145  *
4146  *                FIXME: chat is nearly thousand lines long.
4147  *                Ridiculous.
4148  *
4149  * Parameters  :
4150  *          1  :  csp = Current client state (buffers, headers, etc...)
4151  *
4152  * Returns     :  Nothing.
4153  *
4154  *********************************************************************/
4155 static void chat(struct client_state *csp)
4156 {
4157    const struct forward_spec *fwd;
4158    struct http_request *http;
4159    /* Skeleton for HTTP response, if we should intercept the request */
4160    struct http_response *rsp;
4161 #ifdef FEATURE_HTTPS_INSPECTION
4162    int use_ssl_tunnel = 0;
4163 #endif
4164
4165    http = csp->http;
4166
4167    if (receive_client_request(csp) != JB_ERR_OK)
4168    {
4169       return;
4170    }
4171    if (parse_client_request(csp) != JB_ERR_OK)
4172    {
4173       return;
4174    }
4175
4176 #ifdef FEATURE_HTTPS_INSPECTION
4177    /*
4178     * Setting flags to use old solution with SSL tunnel and to disable
4179     * certificate verification.
4180     */
4181    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION)
4182       && !cgi_page_requested(csp->http->host))
4183    {
4184       use_ssl_tunnel = 1;
4185    }
4186
4187    if (http->ssl && (csp->action->flags & ACTION_IGNORE_CERTIFICATE_ERRORS))
4188    {
4189       csp->dont_verify_certificate = 1;
4190    }
4191 #endif
4192
4193    /*
4194     * build the http request to send to the server
4195     * we have to do one of the following:
4196     *
4197     * create =    use the original HTTP request to create a new
4198     *             HTTP request that has either the path component
4199     *             without the http://domainspec (w/path) or the
4200     *             full orininal URL (w/url)
4201     *             Note that the path and/or the HTTP version may
4202     *             have been altered by now.
4203     *
4204     * SSL proxy = Open a socket to the host:port of the server
4205     *             and create TLS/SSL connection with server and
4206     *             with client. Then behave like mediator between
4207     *             client and server over TLS/SSL.
4208     *
4209     * SSL proxy = Pass the request unchanged if forwarding a CONNECT
4210     *    with     request to a parent proxy. Note that we'll be sending
4211     * forwarding  the CFAIL message ourselves if connecting to the parent
4212     *             fails, but we won't send a CSUCCEED message if it works,
4213     *             since that would result in a double message (ours and the
4214     *             parent's). After sending the request to the parent, we
4215     *             must parse answer and send it to client. If connection
4216     *             with server is established, we do TLS/SSL proxy. Otherwise
4217     *             we send parent response to client and close connections.
4218     *
4219     * here's the matrix:
4220     *                        SSL
4221     *                    0        1
4222     *                +--------+--------+
4223     *                |        |        |
4224     *             0  | create |   SSL  |
4225     *                | w/path |  proxy |
4226     *  Forwarding    +--------+--------+
4227     *                |        |   SSL  |
4228     *             1  | create |  proxy |
4229     *                | w/url  |+forward|
4230     *                +--------+--------+
4231     *
4232     */
4233
4234 #ifdef FEATURE_HTTPS_INSPECTION
4235    /*
4236     * Presetting SSL client and server flags
4237     */
4238    if (http->ssl && !use_ssl_tunnel)
4239    {
4240       http->client_ssl = 1;
4241       http->server_ssl = 1;
4242    }
4243    else
4244    {
4245       http->client_ssl = 0;
4246       http->server_ssl = 0;
4247    }
4248 #endif
4249
4250 #ifdef FEATURE_HTTPS_INSPECTION
4251    /*
4252     * Log the request unless we're https inspecting
4253     * in which case we don't have the path yet and
4254     * will log the request later.
4255     */
4256    if (!client_use_ssl(csp))
4257 #endif
4258    {
4259       log_error(LOG_LEVEL_REQUEST, "%s%s", http->hostport, http->path);
4260    }
4261
4262    if (http->ssl && connect_port_is_forbidden(csp))
4263    {
4264       const char *acceptable_connect_ports =
4265          csp->action->string[ACTION_STRING_LIMIT_CONNECT];
4266       assert(NULL != acceptable_connect_ports);
4267       log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
4268          "limit-connect{%s} doesn't allow CONNECT requests to %s",
4269          csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport);
4270       csp->action->flags |= ACTION_BLOCK;
4271       http->ssl = 0;
4272 #ifdef FEATURE_HTTPS_INSPECTION
4273       http->client_ssl = 0;
4274       http->server_ssl = 0;
4275 #endif
4276    }
4277
4278    /*
4279     * We have a request. Check if one of the crunchers wants it
4280     * unless the client wants to use TLS/SSL in which case we
4281     * haven't setup the TLS context yet and will send the crunch
4282     * response later.
4283     */
4284    if (
4285 #ifdef FEATURE_HTTPS_INSPECTION
4286        !client_use_ssl(csp) &&
4287 #endif
4288        crunch_response_triggered(csp, crunchers_all))
4289    {
4290       /*
4291        * Yes. The client got the crunch response and we're done here.
4292        */
4293       return;
4294    }
4295
4296 #ifdef FEATURE_HTTPS_INSPECTION
4297    if (client_use_ssl(csp) && !use_ssl_tunnel)
4298    {
4299       int ret;
4300       /*
4301        * Creating a SSL proxy.
4302        *
4303        * By sending the CSUCCEED message we're lying to the client as
4304        * the connection hasn't actually been established yet. We don't
4305        * establish the connection until we have seen and parsed the
4306        * encrypted client headers.
4307        */
4308       if (write_socket_delayed(csp->cfd, CSUCCEED,
4309             strlen(CSUCCEED), get_write_delay(csp)) != 0)
4310       {
4311          log_error(LOG_LEVEL_ERROR, "Sending SUCCEED to client failed");
4312          return;
4313       }
4314
4315       ret = create_client_ssl_connection(csp);
4316       if (ret != 0)
4317       {
4318          log_error(LOG_LEVEL_ERROR,
4319             "Failed to open a secure connection with the client");
4320          return;
4321       }
4322       if (JB_ERR_OK != process_encrypted_request(csp))
4323       {
4324          close_client_ssl_connection(csp);
4325          return;
4326       }
4327       /*
4328        * We have an encrypted request. Check if one of the crunchers now
4329        * wants it (for example because the previously invisible path was
4330        * required to match).
4331        */
4332       if (crunch_response_triggered(csp, crunchers_all))
4333       {
4334          /*
4335           * Yes. The client got the crunch response and we're done here.
4336           */
4337          return;
4338       }
4339    }
4340 #endif
4341
4342    /* decide how to route the HTTP request */
4343    fwd = forward_url(csp, http);
4344
4345    freez(csp->headers->first->str);
4346    build_request_line(csp, fwd, &csp->headers->first->str);
4347
4348    log_applied_actions(csp->action);
4349    if (fwd->forward_host)
4350    {
4351       log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
4352          fwd->forward_host, fwd->forward_port, http->hostport);
4353    }
4354    else
4355    {
4356       log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
4357    }
4358
4359    /* here we connect to the server, gateway, or the forwarder */
4360
4361 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4362    if ((csp->server_connection.sfd != JB_INVALID_SOCKET)
4363       && socket_is_still_alive(csp->server_connection.sfd)
4364       && connection_destination_matches(&csp->server_connection, http, fwd))
4365    {
4366       log_error(LOG_LEVEL_CONNECT,
4367          "Reusing server socket %d connected to %s. Total requests: %u.",
4368          csp->server_connection.sfd, csp->server_connection.host,
4369          csp->server_connection.requests_sent_total);
4370    }
4371    else
4372    {
4373       if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4374       {
4375 #ifdef FEATURE_CONNECTION_SHARING
4376          if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING
4377 #ifdef FEATURE_HTTPS_INSPECTION
4378             && !server_use_ssl(csp)
4379 #endif
4380             )
4381          {
4382             remember_connection(&csp->server_connection);
4383          }
4384          else
4385 #endif /* def FEATURE_CONNECTION_SHARING */
4386          {
4387             log_error(LOG_LEVEL_CONNECT,
4388                "Closing server socket %d connected to %s. Total requests: %u.",
4389                csp->server_connection.sfd, csp->server_connection.host,
4390                csp->server_connection.requests_sent_total);
4391             close_socket(csp->server_connection.sfd);
4392          }
4393          mark_connection_closed(&csp->server_connection);
4394       }
4395 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4396
4397       /*
4398        * Connecting to destination server
4399        */
4400       csp->server_connection.sfd = forwarded_connect(fwd, http, csp);
4401
4402       if (csp->server_connection.sfd == JB_INVALID_SOCKET)
4403       {
4404          if (fwd->type != SOCKS_NONE)
4405          {
4406             /* Socks error. */
4407             rsp = error_response(csp, "forwarding-failed");
4408          }
4409          else if (errno == EINVAL)
4410          {
4411             rsp = error_response(csp, "no-such-domain");
4412          }
4413          else
4414          {
4415             rsp = error_response(csp, "connect-failed");
4416          }
4417
4418          /* Write the answer to the client */
4419          if (rsp != NULL)
4420          {
4421             send_crunch_response(csp, rsp);
4422          }
4423
4424          /*
4425           * Temporary workaround to prevent already-read client
4426           * bodies from being parsed as new requests. For now we
4427           * err on the safe side and throw all the following
4428           * requests under the bus, even if no client body has been
4429           * buffered. A compliant client will repeat the dropped
4430           * requests on an untainted connection.
4431           *
4432           * The proper fix is to discard the no longer needed
4433           * client body in the buffer (if there is one) and to
4434           * continue parsing the bytes that follow.
4435           */
4436 #ifdef FEATURE_HTTPS_INSPECTION
4437          close_client_ssl_connection(csp);
4438 #endif
4439          drain_and_close_socket(csp->cfd);
4440          csp->cfd = JB_INVALID_SOCKET;
4441
4442          return;
4443       }
4444
4445 #ifdef FEATURE_HTTPS_INSPECTION
4446       /*
4447        * Creating TLS/SSL connections with destination server or parent
4448        * proxy. If forwarding is enabled, we must send client request to
4449        * parent proxy and receive, parse and resend parent proxy answer.
4450        */
4451       if (http->ssl && !use_ssl_tunnel)
4452       {
4453          if (fwd->forward_host != NULL)
4454          {
4455             char server_response[BUFFER_SIZE];
4456             int ret = 0;
4457             int len = 0;
4458             char *hdr = list_to_text(csp->headers);
4459             memset(server_response, 0, sizeof(server_response));
4460
4461             if (hdr == NULL)
4462             {
4463                log_error(LOG_LEVEL_FATAL,
4464                   "Out of memory parsing client header");
4465             }
4466             list_remove_all(csp->headers);
4467
4468             /*
4469              * Sending client's CONNECT request to the parent proxy
4470              */
4471             ret = write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
4472
4473             freez(hdr);
4474
4475             if (ret != 0)
4476             {
4477                log_error(LOG_LEVEL_CONNECT,
4478                   "Sending request headers to: %s failed", http->hostport);
4479                mark_server_socket_tainted(csp);
4480                close_client_ssl_connection(csp);
4481                return;
4482             }
4483
4484             /* Waiting for parent proxy server response */
4485             len = read_socket(csp->server_connection.sfd, server_response,
4486                sizeof(server_response)-1);
4487
4488             if (len <= 0)
4489             {
4490                log_error(LOG_LEVEL_ERROR, "No response from parent proxy "
4491                   "server on socket %d.", csp->server_connection.sfd);
4492
4493                rsp = error_response(csp, "no-server-data");
4494                if (rsp)
4495                {
4496                   send_crunch_response(csp, rsp);
4497                }
4498                mark_server_socket_tainted(csp);
4499                close_client_ssl_connection(csp);
4500                return;
4501             }
4502
4503             /*
4504              * Test if the connection to the destination server was
4505              * established successfully by the parent proxy.
4506              */
4507             if (!tunnel_established_successfully(server_response, (unsigned int)len))
4508             {
4509                log_error(LOG_LEVEL_ERROR,
4510                   "The forwarder %s failed to establish a connection with %s",
4511                   fwd->forward_host, http->host);
4512                rsp = error_response(csp, "connect-failed");
4513                if (rsp)
4514                {
4515                   send_crunch_response(csp, rsp);
4516                }
4517                mark_server_socket_tainted(csp);
4518                close_client_ssl_connection(csp);
4519                return;
4520             }
4521          } /* -END- if (fwd->forward_host != NULL) */
4522
4523          /*
4524           * We can now create the TLS/SSL connection with the destination server.
4525           */
4526          int ret = create_server_ssl_connection(csp);
4527          if (ret != 0)
4528          {
4529             if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4530                 csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4531             {
4532                /*
4533                 * If the server certificate is invalid, we must inform
4534                 * the client and then close connection to the client.
4535                 */
4536                ssl_send_certificate_error(csp);
4537                close_client_and_server_ssl_connections(csp);
4538                return;
4539             }
4540             if (csp->server_cert_verification_result == SSL_CERT_NOT_VERIFIED
4541              || csp->server_cert_verification_result == SSL_CERT_VALID)
4542             {
4543                /*
4544                 * The TLS/SSL connection wasn't created but an invalid
4545                 * certificate wasn't detected. Report it as connection
4546                 * failure.
4547                 */
4548                rsp = error_response(csp, "connect-failed");
4549                if (rsp)
4550                {
4551                   send_crunch_response(csp, rsp);
4552                }
4553                close_client_and_server_ssl_connections(csp);
4554                return;
4555             }
4556          }
4557       }/* -END- if (http->ssl) */
4558 #endif /* def FEATURE_HTTPS_INSPECTION */
4559
4560 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4561       save_connection_destination(csp->server_connection.sfd,
4562          http, fwd, &csp->server_connection);
4563       csp->server_connection.keep_alive_timeout =
4564          (unsigned)csp->config->keep_alive_timeout;
4565    }
4566 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4567
4568    csp->server_connection.requests_sent_total++;
4569
4570    if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first))
4571    {
4572       /* Client headers have been sent optimistically */
4573       assert(csp->headers->last == NULL);
4574    }
4575    else if (http->ssl == 0 || (fwd->forward_host
4576 #ifdef FEATURE_HTTPS_INSPECTION
4577          && use_ssl_tunnel
4578 #endif
4579            ))
4580    {
4581       if (send_http_request(csp))
4582       {
4583          rsp = error_response(csp, "connect-failed");
4584          if (rsp)
4585          {
4586             send_crunch_response(csp, rsp);
4587          }
4588          return;
4589       }
4590    }
4591    else
4592    {
4593       /*
4594        * Using old solution with SSL tunnel or new solution with SSL proxy
4595        */
4596       list_remove_all(csp->headers);
4597 #ifdef FEATURE_HTTPS_INSPECTION
4598       if (use_ssl_tunnel)
4599 #endif
4600       {
4601          /*
4602          * We're running an SSL tunnel and we're not forwarding,
4603          * so just ditch the client headers, send the "connect succeeded"
4604          * message to the client, flush the rest, and get out of the way.
4605          */
4606          if (write_socket_delayed(csp->cfd, CSUCCEED,
4607                strlen(CSUCCEED), get_write_delay(csp)))
4608          {
4609             return;
4610          }
4611       }
4612 #ifdef FEATURE_HTTPS_INSPECTION
4613       else
4614       {
4615          /*
4616           * If server certificate has been verified and is invalid,
4617           * we must inform the client and then close the connection
4618           * with client and server.
4619           */
4620          if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4621              csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4622          {
4623             ssl_send_certificate_error(csp);
4624             close_client_and_server_ssl_connections(csp);
4625             return;
4626          }
4627          if (send_https_request(csp))
4628          {
4629             rsp = error_response(csp, "connect-failed");
4630             if (rsp)
4631             {
4632                send_crunch_response(csp, rsp);
4633             }
4634             close_client_and_server_ssl_connections(csp);
4635             return;
4636          }
4637       }
4638 #endif /* def FEATURE_HTTPS_INSPECTION */
4639       clear_iob(csp->client_iob);
4640    }/* -END- else ... if (http->ssl == 1) */
4641
4642    log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
4643
4644    /* XXX: should the time start earlier for optimistically sent data? */
4645    csp->server_connection.request_sent = time(NULL);
4646
4647    handle_established_connection(csp);
4648    freez(csp->receive_buffer);
4649 }
4650
4651
4652 #ifdef FUZZ
4653 /*********************************************************************
4654  *
4655  * Function    :  fuzz_server_response
4656  *
4657  * Description :  Treat the input as a whole server response.
4658  *
4659  * Parameters  :
4660  *          1  :  csp = Current client state (buffers, headers, etc...)
4661  *          2  :  fuzz_input_file = File to read the input from.
4662  *
4663  * Returns     :  0
4664  *
4665  *********************************************************************/
4666 extern int fuzz_server_response(struct client_state *csp, char *fuzz_input_file)
4667 {
4668    static struct forward_spec fwd; /* Zero'd due to being static */
4669    csp->cfd = 0;
4670
4671    if (strcmp(fuzz_input_file, "-") == 0)
4672    {
4673       /* XXX: Doesn't work yet. */
4674       csp->server_connection.sfd = 0;
4675    }
4676    else
4677    {
4678       csp->server_connection.sfd = open(fuzz_input_file, O_RDONLY);
4679       if (csp->server_connection.sfd == -1)
4680       {
4681          log_error(LOG_LEVEL_FATAL, "Failed to open %s: %E",
4682             fuzz_input_file);
4683       }
4684    }
4685    csp->fwd = &fwd;
4686    csp->content_type |= CT_GIF;
4687    csp->action->flags |= ACTION_DEANIMATE;
4688    csp->action->string[ACTION_STRING_DEANIMATE] = "last";
4689
4690    csp->http->path = strdup_or_die("/");
4691    csp->http->host = strdup_or_die("fuzz.example.org");
4692    csp->http->hostport = strdup_or_die("fuzz.example.org:80");
4693    /* Prevent client socket monitoring */
4694    csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4695    csp->flags |= CSP_FLAG_CHUNKED;
4696
4697    csp->config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
4698    csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4699
4700    csp->content_type |= CT_DECLARED|CT_GIF;
4701
4702    csp->config->socket_timeout = 0;
4703
4704    cgi_init_error_messages();
4705
4706    handle_established_connection(csp);
4707    freez(csp->receive_buffer);
4708
4709    return 0;
4710 }
4711 #endif
4712
4713
4714 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4715 /*********************************************************************
4716  *
4717  * Function    :  prepare_csp_for_next_request
4718  *
4719  * Description :  Put the csp in a mostly vergin state.
4720  *
4721  * Parameters  :
4722  *          1  :  csp = Current client state (buffers, headers, etc...)
4723  *
4724  * Returns     :  N/A
4725  *
4726  *********************************************************************/
4727 static void prepare_csp_for_next_request(struct client_state *csp)
4728 {
4729    csp->content_type = 0;
4730    csp->content_length = 0;
4731    csp->expected_content_length = 0;
4732    csp->expected_client_content_length = 0;
4733    list_remove_all(csp->headers);
4734    clear_iob(csp->iob);
4735    freez(csp->error_message);
4736    free_http_request(csp->http);
4737    destroy_list(csp->headers);
4738 #ifdef FEATURE_HTTPS_INSPECTION
4739    destroy_list(csp->https_headers);
4740 #endif
4741    destroy_list(csp->tags);
4742 #ifdef FEATURE_CLIENT_TAGS
4743    destroy_list(csp->client_tags);
4744    freez(csp->client_address);
4745 #endif
4746    free_current_action(csp->action);
4747    if (NULL != csp->fwd)
4748    {
4749       unload_forward_spec(csp->fwd);
4750       csp->fwd = NULL;
4751    }
4752    /* XXX: Store per-connection flags someplace else. */
4753    csp->flags = (CSP_FLAG_ACTIVE | CSP_FLAG_REUSED_CLIENT_CONNECTION);
4754 #ifdef FEATURE_TOGGLE
4755    if (global_toggle_state)
4756 #endif /* def FEATURE_TOGGLE */
4757    {
4758       csp->flags |= CSP_FLAG_TOGGLED_ON;
4759    }
4760
4761    if (csp->client_iob->eod > csp->client_iob->cur)
4762    {
4763       long bytes_to_shift = csp->client_iob->cur - csp->client_iob->buf;
4764       size_t data_length  = (size_t)(csp->client_iob->eod - csp->client_iob->cur);
4765
4766       assert(bytes_to_shift > 0);
4767       assert(data_length > 0);
4768
4769       log_error(LOG_LEVEL_CONNECT, "Shifting %lu pipelined bytes by %ld bytes",
4770          data_length, bytes_to_shift);
4771       memmove(csp->client_iob->buf, csp->client_iob->cur, data_length);
4772       csp->client_iob->cur = csp->client_iob->buf;
4773       assert(csp->client_iob->eod == csp->client_iob->buf + bytes_to_shift + data_length);
4774       csp->client_iob->eod = csp->client_iob->buf + data_length;
4775       memset(csp->client_iob->eod, '\0', (size_t)bytes_to_shift);
4776
4777       csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4778    }
4779    else
4780    {
4781       /*
4782        * We mainly care about resetting client_iob->cur so we don't
4783        * waste buffer space at the beginning and don't mess up the
4784        * request restoration done by cgi_show_request().
4785        *
4786        * Freeing the buffer itself isn't technically necessary,
4787        * but makes debugging more convenient.
4788        */
4789       clear_iob(csp->client_iob);
4790    }
4791 }
4792 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4793
4794
4795 /*********************************************************************
4796  *
4797  * Function    :  serve
4798  *
4799  * Description :  This is little more than chat.  We only "serve" to
4800  *                to close (or remember) any socket that chat may have
4801  *                opened.
4802  *
4803  * Parameters  :
4804  *          1  :  csp = Current client state (buffers, headers, etc...)
4805  *
4806  * Returns     :  N/A
4807  *
4808  *********************************************************************/
4809 static void serve(struct client_state *csp)
4810 {
4811    int config_file_change_detected = 0; /* Only used for debugging */
4812 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4813 #ifdef FEATURE_CONNECTION_SHARING
4814    static int monitor_thread_running = 0;
4815 #endif /* def FEATURE_CONNECTION_SHARING */
4816    int continue_chatting = 0;
4817
4818    log_error(LOG_LEVEL_CONNECT, "Accepted connection from %s on socket %d",
4819       csp->ip_addr_str, csp->cfd);
4820
4821    do
4822    {
4823       unsigned int latency;
4824
4825 #ifdef FEATURE_HTTPS_INSPECTION
4826       if (continue_chatting && client_use_ssl(csp))
4827       {
4828          continue_https_chat(csp);
4829       }
4830       else
4831 #endif
4832       {
4833          chat(csp);
4834       }
4835
4836       /*
4837        * If the request has been crunched,
4838        * the calculated latency is zero.
4839        */
4840       latency = (unsigned)(csp->server_connection.response_received -
4841          csp->server_connection.request_sent) / 2;
4842
4843       if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4844          && (csp->flags & CSP_FLAG_CRUNCHED)
4845          && (csp->expected_client_content_length != 0))
4846       {
4847          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
4848          log_error(LOG_LEVEL_CONNECT,
4849             "Tainting client socket %d due to unread data.", csp->cfd);
4850       }
4851
4852       continue_chatting = (csp->config->feature_flags
4853          & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
4854          && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4855          && (csp->cfd != JB_INVALID_SOCKET)
4856          && (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4857          && ((csp->flags & CSP_FLAG_SERVER_CONTENT_LENGTH_SET)
4858             || (csp->flags & CSP_FLAG_CHUNKED));
4859
4860       if (!(csp->flags & CSP_FLAG_CRUNCHED)
4861          && (csp->server_connection.sfd != JB_INVALID_SOCKET))
4862       {
4863          if (!(csp->flags & CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET))
4864          {
4865             csp->server_connection.keep_alive_timeout = csp->config->default_server_timeout;
4866          }
4867          if (!(csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
4868             || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4869             || !socket_is_still_alive(csp->server_connection.sfd)
4870             || !(latency < csp->server_connection.keep_alive_timeout))
4871          {
4872             log_error(LOG_LEVEL_CONNECT,
4873                "Closing server socket %d connected to %s. "
4874                "Keep-alive: %u. Tainted: %u. Socket alive: %u. Timeout: %u.",
4875                csp->server_connection.sfd, (csp->server_connection.host != NULL) ?
4876                csp->server_connection.host : csp->http->host,
4877                0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
4878                0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
4879                socket_is_still_alive(csp->server_connection.sfd),
4880                csp->server_connection.keep_alive_timeout);
4881 #ifdef FEATURE_CONNECTION_SHARING
4882             if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4883             {
4884                forget_connection(csp->server_connection.sfd);
4885             }
4886 #endif /* def FEATURE_CONNECTION_SHARING */
4887 #ifdef FEATURE_HTTPS_INSPECTION
4888             close_server_ssl_connection(csp);
4889 #endif
4890             close_socket(csp->server_connection.sfd);
4891             mark_connection_closed(&csp->server_connection);
4892 #ifdef FEATURE_HTTPS_INSPECTION
4893             if (continue_chatting && client_use_ssl(csp))
4894             {
4895                /*
4896                 * Close the client socket as well as Privoxy currently
4897                 * can't establish a new server connection when the client
4898                 * socket is reused and would drop the connection in
4899                 * continue_https_chat() anyway.
4900                 */
4901                continue_chatting = 0;
4902                csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4903                log_error(LOG_LEVEL_CONNECT,
4904                   "Client socket %d is no longer usable. "
4905                   "The server socket has been closed.", csp->cfd);
4906             }
4907 #endif
4908          }
4909       }
4910
4911       if (continue_chatting && any_loaded_file_changed(csp))
4912       {
4913          continue_chatting = 0;
4914          config_file_change_detected = 1;
4915       }
4916 #ifdef FEATURE_HTTPS_INSPECTION
4917       if (continue_chatting && client_use_ssl(csp) &&
4918          csp->ssl_with_client_is_opened == 0)
4919       {
4920          continue_chatting = 0;
4921          log_error(LOG_LEVEL_CONNECT, "Client socket %d is no longer usable. "
4922             "The TLS session has been terminated.", csp->cfd);
4923       }
4924 #endif
4925
4926       if (continue_chatting)
4927       {
4928          if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
4929             && socket_is_still_alive(csp->cfd))
4930          {
4931             log_error(LOG_LEVEL_CONNECT, "Client request %d has been "
4932                "pipelined on socket %d and the socket is still alive.",
4933                csp->requests_received_total+1, csp->cfd);
4934             prepare_csp_for_next_request(csp);
4935             continue;
4936          }
4937
4938          if (0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
4939          {
4940             if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4941             {
4942                log_error(LOG_LEVEL_CONNECT,
4943                   "Waiting for the next client request on socket %d. "
4944                   "Keeping the server socket %d to %s open.",
4945                   csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
4946             }
4947             else
4948             {
4949                log_error(LOG_LEVEL_CONNECT,
4950                   "Waiting for the next client request on socket %d. "
4951                   "No server socket to keep open.", csp->cfd);
4952             }
4953          }
4954
4955          if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4956             && data_is_available(csp->cfd, (int)csp->config->keep_alive_timeout)
4957             && socket_is_still_alive(csp->cfd))
4958          {
4959             log_error(LOG_LEVEL_CONNECT,
4960                "Data arrived in time on client socket %d. Requests so far: %u",
4961                csp->cfd, csp->requests_received_total);
4962             prepare_csp_for_next_request(csp);
4963          }
4964          else
4965          {
4966 #ifdef FEATURE_CONNECTION_SHARING
4967             if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4968                && (csp->server_connection.sfd != JB_INVALID_SOCKET)
4969                && (socket_is_still_alive(csp->server_connection.sfd))
4970 #ifdef FEATURE_HTTPS_INSPECTION
4971                && !server_use_ssl(csp)
4972 #endif
4973                 )
4974             {
4975                time_t time_open = time(NULL) - csp->server_connection.timestamp;
4976
4977                if (csp->server_connection.keep_alive_timeout < time_open - (time_t)latency)
4978                {
4979                   break;
4980                }
4981
4982                remember_connection(&csp->server_connection);
4983                csp->server_connection.sfd = JB_INVALID_SOCKET;
4984                drain_and_close_socket(csp->cfd);
4985                csp->cfd = JB_INVALID_SOCKET;
4986                privoxy_mutex_lock(&connection_reuse_mutex);
4987                if (!monitor_thread_running)
4988                {
4989                   monitor_thread_running = 1;
4990                   privoxy_mutex_unlock(&connection_reuse_mutex);
4991                   wait_for_alive_connections();
4992                   privoxy_mutex_lock(&connection_reuse_mutex);
4993                   monitor_thread_running = 0;
4994                }
4995                privoxy_mutex_unlock(&connection_reuse_mutex);
4996             }
4997 #endif /* def FEATURE_CONNECTION_SHARING */
4998             break;
4999          }
5000       }
5001       else if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5002       {
5003          log_error(LOG_LEVEL_CONNECT,
5004             "Closing server socket %d connected to %s. Keep-alive: %u. "
5005             "Tainted: %u. Socket alive: %u. Timeout: %u. "
5006             "Configuration file change detected: %u",
5007             csp->server_connection.sfd, csp->server_connection.host,
5008             0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
5009             0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
5010             socket_is_still_alive(csp->server_connection.sfd),
5011             csp->server_connection.keep_alive_timeout,
5012             config_file_change_detected);
5013       }
5014    } while (continue_chatting);
5015
5016 #else
5017    chat(csp);
5018 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
5019
5020    if (csp->cfd != JB_INVALID_SOCKET)
5021    {
5022       log_error(LOG_LEVEL_CONNECT, "Closing client socket %d. "
5023          "Keep-alive: %u. Socket alive: %u. Data available: %u. "
5024          "Configuration file change detected: %u. Requests received: %u.",
5025          csp->cfd, 0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE),
5026          socket_is_still_alive(csp->cfd), data_is_available(csp->cfd, 0),
5027          config_file_change_detected, csp->requests_received_total);
5028 #ifdef FEATURE_HTTPS_INSPECTION
5029       close_client_ssl_connection(csp);
5030 #endif
5031       drain_and_close_socket(csp->cfd);
5032    }
5033
5034    if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5035    {
5036 #ifdef FEATURE_CONNECTION_SHARING
5037       if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
5038       {
5039          forget_connection(csp->server_connection.sfd);
5040       }
5041 #endif /* def FEATURE_CONNECTION_SHARING */
5042
5043 #ifdef FEATURE_HTTPS_INSPECTION
5044       close_server_ssl_connection(csp);
5045 #endif /* def FEATURE_HTTPS_INSPECTION */
5046
5047       close_socket(csp->server_connection.sfd);
5048    }
5049
5050 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
5051    mark_connection_closed(&csp->server_connection);
5052 #endif
5053
5054    free_csp_resources(csp);
5055
5056    csp->flags &= ~CSP_FLAG_ACTIVE;
5057
5058 }
5059
5060
5061 #ifdef __BEOS__
5062 /*********************************************************************
5063  *
5064  * Function    :  server_thread
5065  *
5066  * Description :  We only exist to call `serve' in a threaded environment.
5067  *
5068  * Parameters  :
5069  *          1  :  data = Current client state (buffers, headers, etc...)
5070  *
5071  * Returns     :  Always 0.
5072  *
5073  *********************************************************************/
5074 static int32 server_thread(void *data)
5075 {
5076    serve((struct client_state *) data);
5077    return 0;
5078
5079 }
5080 #endif
5081
5082
5083 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5084 /*********************************************************************
5085  *
5086  * Function    :  usage
5087  *
5088  * Description :  Print usage info & exit.
5089  *
5090  * Parameters  :  Pointer to argv[0] for identifying ourselves
5091  *
5092  * Returns     :  No. ,-)
5093  *
5094  *********************************************************************/
5095 static void usage(const char *name)
5096 {
5097    printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
5098           "Usage: %s [--config-test] "
5099 #if defined(unix)
5100           "[--chroot] "
5101 #endif /* defined(unix) */
5102           "[--help] "
5103 #if defined(unix)
5104           "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
5105 #endif /* defined(unix) */
5106          "[--version] [configfile]\n",
5107           name);
5108
5109 #ifdef FUZZ
5110    show_fuzz_usage(name);
5111 #endif
5112
5113    printf("Aborting\n");
5114
5115    exit(2);
5116
5117 }
5118 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
5119
5120
5121 #ifdef MUTEX_LOCKS_AVAILABLE
5122 /*********************************************************************
5123  *
5124  * Function    :  privoxy_mutex_lock
5125  *
5126  * Description :  Locks a mutex.
5127  *
5128  * Parameters  :
5129  *          1  :  mutex = The mutex to lock.
5130  *
5131  * Returns     :  Void. May exit in case of errors.
5132  *
5133  *********************************************************************/
5134 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
5135 {
5136 #ifdef FEATURE_PTHREAD
5137    int err = pthread_mutex_lock(mutex);
5138    if (err)
5139    {
5140       if (mutex != &log_mutex)
5141       {
5142          log_error(LOG_LEVEL_FATAL,
5143             "Mutex locking failed: %s.\n", strerror(err));
5144       }
5145       exit(1);
5146    }
5147 #else
5148    EnterCriticalSection(mutex);
5149 #endif /* def FEATURE_PTHREAD */
5150 }
5151
5152
5153 /*********************************************************************
5154  *
5155  * Function    :  privoxy_mutex_unlock
5156  *
5157  * Description :  Unlocks a mutex.
5158  *
5159  * Parameters  :
5160  *          1  :  mutex = The mutex to unlock.
5161  *
5162  * Returns     :  Void. May exit in case of errors.
5163  *
5164  *********************************************************************/
5165 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
5166 {
5167 #ifdef FEATURE_PTHREAD
5168    int err = pthread_mutex_unlock(mutex);
5169    if (err)
5170    {
5171       if (mutex != &log_mutex)
5172       {
5173          log_error(LOG_LEVEL_FATAL,
5174             "Mutex unlocking failed: %s.\n", strerror(err));
5175       }
5176       exit(1);
5177    }
5178 #else
5179    LeaveCriticalSection(mutex);
5180 #endif /* def FEATURE_PTHREAD */
5181 }
5182
5183
5184 /*********************************************************************
5185  *
5186  * Function    :  privoxy_mutex_init
5187  *
5188  * Description :  Prepares a mutex.
5189  *
5190  * Parameters  :
5191  *          1  :  mutex = The mutex to initialize.
5192  *
5193  * Returns     :  Void. May exit in case of errors.
5194  *
5195  *********************************************************************/
5196 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
5197 {
5198 #ifdef FEATURE_PTHREAD
5199    int err = pthread_mutex_init(mutex, 0);
5200    if (err)
5201    {
5202       printf("Fatal error. Mutex initialization failed: %s.\n",
5203          strerror(err));
5204       exit(1);
5205    }
5206 #else
5207    InitializeCriticalSection(mutex);
5208 #endif /* def FEATURE_PTHREAD */
5209 }
5210 #endif /* def MUTEX_LOCKS_AVAILABLE */
5211
5212 /*********************************************************************
5213  *
5214  * Function    :  initialize_mutexes
5215  *
5216  * Description :  Prepares mutexes if mutex support is available.
5217  *
5218  * Parameters  :  None
5219  *
5220  * Returns     :  Void, exits in case of errors.
5221  *
5222  *********************************************************************/
5223 static void initialize_mutexes(void)
5224 {
5225 #ifdef MUTEX_LOCKS_AVAILABLE
5226    /*
5227     * Prepare global mutex semaphores
5228     */
5229
5230 #ifdef FEATURE_HTTPS_INSPECTION
5231    privoxy_mutex_init(&certificate_mutex);
5232    privoxy_mutex_init(&ssl_init_mutex);
5233 #endif
5234
5235    privoxy_mutex_init(&log_mutex);
5236    privoxy_mutex_init(&log_init_mutex);
5237    privoxy_mutex_init(&connection_reuse_mutex);
5238 #ifdef FEATURE_EXTERNAL_FILTERS
5239    privoxy_mutex_init(&external_filter_mutex);
5240 #endif
5241 #ifdef FEATURE_CLIENT_TAGS
5242    privoxy_mutex_init(&client_tags_mutex);
5243 #endif
5244 #ifdef FEATURE_EXTENDED_STATISTICS
5245    privoxy_mutex_init(&filter_statistics_mutex);
5246    privoxy_mutex_init(&block_statistics_mutex);
5247 #endif
5248
5249    /*
5250     * XXX: The assumptions below are a bit naive
5251     * and can cause locks that aren't necessary.
5252     *
5253     * For example older FreeBSD versions (< 6.x?)
5254     * have no gethostbyname_r, but gethostbyname is
5255     * thread safe.
5256     */
5257 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
5258    privoxy_mutex_init(&resolver_mutex);
5259 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
5260    /*
5261     * XXX: should we use a single mutex for
5262     * localtime() and gmtime() as well?
5263     */
5264 #ifndef HAVE_GMTIME_R
5265    privoxy_mutex_init(&gmtime_mutex);
5266 #endif /* ndef HAVE_GMTIME_R */
5267
5268 #ifndef HAVE_LOCALTIME_R
5269    privoxy_mutex_init(&localtime_mutex);
5270 #endif /* ndef HAVE_GMTIME_R */
5271
5272 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
5273    privoxy_mutex_init(&rand_mutex);
5274 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
5275
5276 #endif /* def MUTEX_LOCKS_AVAILABLE */
5277 }
5278
5279 /*********************************************************************
5280  *
5281  * Function    :  main
5282  *
5283  * Description :  Load the config file and start the listen loop.
5284  *                This function is a lot more *sane* with the `load_config'
5285  *                and `listen_loop' functions; although it stills does
5286  *                a *little* too much for my taste.
5287  *
5288  * Parameters  :
5289  *          1  :  argc = Number of parameters (including $0).
5290  *          2  :  argv = Array of (char *)'s to the parameters.
5291  *
5292  * Returns     :  1 if : can't open config file, unrecognized directive,
5293  *                stats requested in multi-thread mode, can't open the
5294  *                log file, can't open the jar file, listen port is invalid,
5295  *                any load fails, and can't bind port.
5296  *
5297  *                Else main never returns, the process must be signaled
5298  *                to terminate execution.  Or, on Windows, use the
5299  *                "File", "Exit" menu option.
5300  *
5301  *********************************************************************/
5302 #ifdef __MINGW32__
5303 int real_main(int argc, char **argv)
5304 #else
5305 int main(int argc, char **argv)
5306 #endif
5307 {
5308    int argc_pos = 0;
5309    int do_config_test = 0;
5310 #ifndef HAVE_ARC4RANDOM
5311    unsigned int random_seed;
5312 #endif
5313 #ifdef unix
5314    struct passwd *pw = NULL;
5315    struct group *grp = NULL;
5316    int do_chroot = 0;
5317    char *pre_chroot_nslookup_to_load_resolver = NULL;
5318 #endif
5319 #ifdef FUZZ
5320    char *fuzz_input_type = NULL;
5321    char *fuzz_input_file = NULL;
5322 #endif
5323
5324    Argc = argc;
5325    Argv = argv;
5326
5327    configfile =
5328 #if !defined(_WIN32)
5329    "config"
5330 #else
5331    "config.txt"
5332 #endif
5333       ;
5334
5335    /* Prepare mutexes if supported and necessary. */
5336    initialize_mutexes();
5337
5338    /* Enable logging until further notice. */
5339    init_log_module();
5340
5341    /*
5342     * Parse the command line arguments
5343     *
5344     * XXX: simply printing usage information in case of
5345     * invalid arguments isn't particularly user friendly.
5346     */
5347    while (++argc_pos < argc)
5348    {
5349 #ifdef _WIN32
5350       /* Check to see if the service must be installed or uninstalled */
5351       if (strncmp(argv[argc_pos], "--install", 9) == 0)
5352       {
5353          const char *pName = argv[argc_pos] + 9;
5354          if (*pName == ':')
5355             pName++;
5356          exit((install_service(pName)) ? 0 : 1);
5357       }
5358       else if (strncmp(argv[argc_pos], "--uninstall", 11) == 0)
5359       {
5360          const char *pName = argv[argc_pos] + 11;
5361          if (*pName == ':')
5362             pName++;
5363          exit((uninstall_service(pName)) ? 0 : 1);
5364       }
5365       else if (strcmp(argv[argc_pos], "--service") == 0)
5366       {
5367          bRunAsService = TRUE;
5368          w32_set_service_cwd();
5369          atexit(w32_service_exit_notify);
5370       }
5371       else
5372 #endif /* defined(_WIN32) */
5373
5374
5375 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5376
5377       if (strcmp(argv[argc_pos], "--help") == 0)
5378       {
5379          usage(argv[0]);
5380       }
5381
5382       else if (strcmp(argv[argc_pos], "--version") == 0)
5383       {
5384          printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
5385          exit(0);
5386       }
5387
5388 #if defined(unix)
5389
5390       else if (strcmp(argv[argc_pos], "--no-daemon") == 0)
5391       {
5392          set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
5393          daemon_mode = 0;
5394       }
5395
5396       else if (strcmp(argv[argc_pos], "--pidfile") == 0)
5397       {
5398          if (++argc_pos == argc) usage(argv[0]);
5399          pidfile = strdup_or_die(argv[argc_pos]);
5400       }
5401
5402       else if (strcmp(argv[argc_pos], "--user") == 0)
5403       {
5404          char *user_arg;
5405          char *group_name;
5406
5407          if (++argc_pos == argc) usage(argv[argc_pos]);
5408
5409          user_arg = strdup_or_die(argv[argc_pos]);
5410          group_name = strchr(user_arg, '.');
5411          if (NULL != group_name)
5412          {
5413             /* Nul-terminate the user name */
5414             *group_name = '\0';
5415
5416             /* Skip the former delimiter to actually reach the group name */
5417             group_name++;
5418
5419             grp = getgrnam(group_name);
5420             if (NULL == grp)
5421             {
5422                log_error(LOG_LEVEL_FATAL, "Group '%s' not found.", group_name);
5423             }
5424          }
5425          pw = getpwnam(user_arg);
5426          if (NULL == pw)
5427          {
5428             log_error(LOG_LEVEL_FATAL, "User '%s' not found.", user_arg);
5429          }
5430
5431          freez(user_arg);
5432       }
5433
5434       else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup") == 0)
5435       {
5436          if (++argc_pos == argc) usage(argv[0]);
5437          pre_chroot_nslookup_to_load_resolver = strdup_or_die(argv[argc_pos]);
5438       }
5439
5440       else if (strcmp(argv[argc_pos], "--chroot") == 0)
5441       {
5442          do_chroot = 1;
5443       }
5444 #endif /* defined(unix) */
5445
5446       else if (strcmp(argv[argc_pos], "--config-test") == 0)
5447       {
5448          do_config_test = 1;
5449       }
5450 #ifdef FUZZ
5451       else if (strcmp(argv[argc_pos], "--fuzz") == 0)
5452       {
5453          argc_pos++;
5454          if (argc < argc_pos + 2) usage(argv[0]);
5455          fuzz_input_type = argv[argc_pos];
5456          argc_pos++;
5457          fuzz_input_file = argv[argc_pos];
5458       }
5459       else if (strcmp(argv[argc_pos], "--stfu") == 0)
5460       {
5461          set_debug_level(LOG_LEVEL_STFU);
5462       }
5463 #endif
5464       else if (argc_pos + 1 != argc)
5465       {
5466          /*
5467           * This is neither the last command line
5468           * option, nor was it recognized before,
5469           * therefore it must be invalid.
5470           */
5471          usage(argv[0]);
5472       }
5473       else
5474
5475 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
5476       {
5477          configfile = argv[argc_pos];
5478       }
5479
5480    } /* -END- while (more arguments) */
5481
5482    show_version(Argv[0]);
5483
5484 #if defined(unix)
5485    if (*configfile != '/')
5486    {
5487       char cwd[BUFFER_SIZE];
5488       char *abs_file;
5489       size_t abs_file_size;
5490
5491       /* make config-filename absolute here */
5492       if (NULL == getcwd(cwd, sizeof(cwd)))
5493       {
5494          perror("failed to get current working directory");
5495          exit(1);
5496       }
5497
5498       basedir = strdup_or_die(cwd);
5499       /* XXX: why + 5? */
5500       abs_file_size = strlen(cwd) + strlen(configfile) + 5;
5501       abs_file = malloc_or_die(abs_file_size);
5502       strlcpy(abs_file, basedir, abs_file_size);
5503       strlcat(abs_file, "/", abs_file_size);
5504       strlcat(abs_file, configfile, abs_file_size);
5505       configfile = abs_file;
5506    }
5507 #endif /* defined unix */
5508
5509
5510    files->next = NULL;
5511    clients->next = NULL;
5512
5513    /* XXX: factor out initialising after the next stable release. */
5514 #ifdef _WIN32
5515    InitWin32();
5516 #endif
5517
5518 #ifndef HAVE_ARC4RANDOM
5519    random_seed = (unsigned int)time(NULL);
5520 #ifdef HAVE_RANDOM
5521    srandom(random_seed);
5522 #else
5523    srand(random_seed);
5524 #endif /* ifdef HAVE_RANDOM */
5525 #endif /* ifndef HAVE_ARC4RANDOM */
5526
5527    /*
5528     * Unix signal handling
5529     *
5530     * Catch the abort, interrupt and terminate signals for a graceful exit
5531     * Catch the hangup signal so the errlog can be reopened.
5532     *
5533     * Ignore the broken pipe signal as connection failures
5534     * are handled when and where they occur without relying
5535     * on a signal.
5536     */
5537 #if !defined(_WIN32)
5538 {
5539    int idx;
5540    const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP };
5541
5542    for (idx = 0; idx < SZ(catched_signals); idx++)
5543    {
5544 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
5545       if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
5546 #else
5547       if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
5548 #endif /* ifdef sun */
5549       {
5550          log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
5551       }
5552    }
5553
5554    if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
5555    {
5556       log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for SIGPIPE: %E");
5557    }
5558
5559 }
5560 #else /* ifdef _WIN32 */
5561 # ifdef _WIN_CONSOLE
5562    /*
5563     * We *are* in a windows console app.
5564     * Print a verbose messages about FAQ's and such
5565     */
5566    printf("%s", win32_blurb);
5567 # endif /* def _WIN_CONSOLE */
5568 #endif /* def _WIN32 */
5569
5570 #ifdef FUZZ
5571    if (fuzz_input_type != NULL)
5572    {
5573       exit(process_fuzzed_input(fuzz_input_type, fuzz_input_file));
5574    }
5575    log_error(LOG_LEVEL_FATAL,
5576       "When compiled with fuzzing support, Privoxy should only be used for fuzzing. "
5577       "Various data structures are static which is unsafe when using threads.");
5578 #endif
5579
5580    if (do_config_test)
5581    {
5582       exit(NULL == load_config());
5583    }
5584
5585    /* Initialize the CGI subsystem */
5586    cgi_init_error_messages();
5587
5588    /*
5589     * If running on unix and without the --no-daemon
5590     * option, become a daemon. I.e. fork, detach
5591     * from tty and get process group leadership
5592     */
5593 #if defined(unix)
5594 {
5595    if (daemon_mode)
5596    {
5597       int fd;
5598       pid_t pid = fork();
5599
5600       if (pid < 0) /* error */
5601       {
5602          perror("fork");
5603          exit(3);
5604       }
5605       else if (pid != 0) /* parent */
5606       {
5607          int status;
5608          pid_t wpid;
5609          /*
5610           * must check for errors
5611           * child died due to missing files aso
5612           */
5613          sleep(1);
5614          wpid = waitpid(pid, &status, WNOHANG);
5615          if (wpid != 0)
5616          {
5617             exit(1);
5618          }
5619          exit(0);
5620       }
5621       /* child */
5622
5623       setsid();
5624
5625       /*
5626        * stderr (fd 2) will be closed later on,
5627        * when the config file has been parsed.
5628        */
5629       close(0);
5630       close(1);
5631
5632       /*
5633        * Reserve fd 0 and 1 to prevent abort() and friends
5634        * from sending stuff to the clients or servers.
5635        */
5636       fd = open("/dev/null", O_RDONLY);
5637       if (fd == -1)
5638       {
5639          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5640       }
5641       else if (fd != 0)
5642       {
5643          if (dup2(fd, 0) == -1)
5644          {
5645             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 0: %E");
5646          }
5647          close(fd);
5648       }
5649       fd = open("/dev/null", O_WRONLY);
5650       if (fd == -1)
5651       {
5652          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5653       }
5654       else if (fd != 1)
5655       {
5656          if (dup2(fd, 1) == -1)
5657          {
5658             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 1: %E");
5659          }
5660          close(fd);
5661       }
5662
5663 #ifdef FEATURE_EXTERNAL_FILTERS
5664       for (fd = 0; fd < 3; fd++)
5665       {
5666          mark_socket_for_close_on_execute(fd);
5667       }
5668 #endif
5669
5670       if (chdir("/") != 0)
5671       {
5672          log_error(LOG_LEVEL_FATAL, "Failed to cd into '/': %E");
5673       }
5674
5675    } /* -END- if (daemon_mode) */
5676
5677    /*
5678     * As soon as we have written the PID file, we can switch
5679     * to the user and group ID indicated by the --user option
5680     */
5681    if (pidfile != NULL)
5682    {
5683       write_pid_file(pidfile);
5684    }
5685    if (NULL != pw)
5686    {
5687       if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
5688       {
5689          log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
5690       }
5691       if (NULL != grp)
5692       {
5693          if (setgroups(1, &grp->gr_gid))
5694          {
5695             log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
5696          }
5697       }
5698       else if (initgroups(pw->pw_name, pw->pw_gid))
5699       {
5700          log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
5701       }
5702       if (do_chroot)
5703       {
5704          if (!pw->pw_dir)
5705          {
5706             log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
5707          }
5708          /* Read the time zone file from /etc before doing chroot. */
5709          tzset();
5710          if (NULL != pre_chroot_nslookup_to_load_resolver
5711              && '\0' != pre_chroot_nslookup_to_load_resolver[0])
5712          {
5713             /* Initialize resolver library. */
5714             (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
5715          }
5716          if (chroot(pw->pw_dir) < 0)
5717          {
5718             log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
5719          }
5720          if (chdir ("/"))
5721          {
5722             log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
5723          }
5724       }
5725       if (setuid(pw->pw_uid))
5726       {
5727          log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
5728       }
5729       if (do_chroot)
5730       {
5731          char putenv_dummy[64];
5732
5733          strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
5734          if (putenv(putenv_dummy) != 0)
5735          {
5736             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
5737          }
5738
5739          snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
5740          if (putenv(putenv_dummy) != 0)
5741          {
5742             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
5743          }
5744       }
5745    }
5746    else if (do_chroot)
5747    {
5748       log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
5749    }
5750 }
5751 #endif /* defined unix */
5752
5753 #ifdef _WIN32
5754    /* This will be FALSE unless the command line specified --service
5755     */
5756    if (bRunAsService)
5757    {
5758       /* Yup, so now we must attempt to establish a connection
5759        * with the service dispatcher. This will only work if this
5760        * process was launched by the service control manager to
5761        * actually run as a service. If this isn't the case, i've
5762        * known it take around 30 seconds or so for the call to return.
5763        */
5764
5765       /* The StartServiceCtrlDispatcher won't return until the service is stopping */
5766       if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
5767       {
5768          /* Service has run, and at this point is now being stopped, so just return */
5769          return 0;
5770       }
5771
5772 #ifdef _WIN_CONSOLE
5773       printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
5774 #endif
5775       /* An error occurred. Usually it's because --service was wrongly specified
5776        * and we were unable to connect to the Service Control Dispatcher because
5777        * it wasn't expecting us and is therefore not listening.
5778        *
5779        * For now, just continue below to call the listen_loop function.
5780        */
5781    }
5782 #endif /* def _WIN32 */
5783
5784    listen_loop();
5785
5786    /* NOTREACHED */
5787    return(-1);
5788
5789 }
5790
5791
5792 /*********************************************************************
5793  *
5794  * Function    :  bind_port_helper
5795  *
5796  * Description :  Bind the listen port.  Handles logging, and aborts
5797  *                on failure.
5798  *
5799  * Parameters  :
5800  *          1  :  haddr = Host address to bind to. Use NULL to bind to
5801  *                        INADDR_ANY.
5802  *          2  :  hport = Specifies port to bind to.
5803  *          3  :  backlog = Listen backlog.
5804  *
5805  * Returns     :  Port that was opened.
5806  *
5807  *********************************************************************/
5808 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog)
5809 {
5810    int result;
5811    jb_socket bfd;
5812
5813    result = bind_port(haddr, hport, backlog, &bfd);
5814
5815    if (result < 0)
5816    {
5817       const char *bind_address = (NULL != haddr) ? haddr : "INADDR_ANY";
5818       switch(result)
5819       {
5820          case -3:
5821             log_error(LOG_LEVEL_FATAL,
5822                "can't bind to %s:%d: There may be another Privoxy "
5823                "or some other proxy running on port %d",
5824                bind_address, hport, hport);
5825             exit(-1);
5826
5827          case -2:
5828             log_error(LOG_LEVEL_FATAL,
5829                "can't bind to %s:%d: The hostname is not resolvable",
5830                bind_address, hport);
5831             exit(-1);
5832
5833          default:
5834             log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: %E",
5835                bind_address, hport);
5836             exit(-1);
5837       }
5838
5839       /* shouldn't get here */
5840       return JB_INVALID_SOCKET;
5841    }
5842
5843 #ifndef HAVE_POLL
5844 #ifndef _WIN32
5845    if (bfd >= FD_SETSIZE)
5846    {
5847       log_error(LOG_LEVEL_FATAL,
5848          "Bind socket number too high to use select(): %d >= %d",
5849          bfd, FD_SETSIZE);
5850    }
5851 #endif
5852 #endif
5853
5854    if (haddr == NULL)
5855    {
5856       log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
5857          hport);
5858    }
5859    else
5860    {
5861       log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
5862          hport, haddr);
5863    }
5864
5865    return bfd;
5866 }
5867
5868
5869 /*********************************************************************
5870  *
5871  * Function    :  bind_ports_helper
5872  *
5873  * Description :  Bind the listen ports.  Handles logging, and aborts
5874  *                on failure.
5875  *
5876  * Parameters  :
5877  *          1  :  config = Privoxy configuration.  Specifies ports
5878  *                         to bind to.
5879  *          2  :  sockets = Preallocated array of opened sockets
5880  *                          corresponding to specification in config.
5881  *                          All non-opened sockets will be set to
5882  *                          JB_INVALID_SOCKET.
5883  *
5884  * Returns     :  Nothing. Inspect sockets argument.
5885  *
5886  *********************************************************************/
5887 static void bind_ports_helper(struct configuration_spec * config,
5888                               jb_socket sockets[])
5889 {
5890    int i;
5891
5892    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
5893    {
5894       if (config->hport[i])
5895       {
5896          sockets[i] = bind_port_helper(config->haddr[i],
5897             config->hport[i], config->listen_backlog);
5898 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
5899          if (config->enable_accept_filter && sockets[i] != JB_INVALID_SOCKET)
5900          {
5901             struct accept_filter_arg af_options;
5902             bzero(&af_options, sizeof(af_options));
5903             strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
5904             if (setsockopt(sockets[i], SOL_SOCKET, SO_ACCEPTFILTER, &af_options,
5905                   sizeof(af_options)))
5906             {
5907                log_error(LOG_LEVEL_ERROR,
5908                   "Enabling accept filter for socket %d failed: %E", sockets[i]);
5909             }
5910          }
5911 #endif
5912       }
5913       else
5914       {
5915          sockets[i] = JB_INVALID_SOCKET;
5916       }
5917    }
5918    config->need_bind = 0;
5919 }
5920
5921
5922 /*********************************************************************
5923  *
5924  * Function    :  close_ports_helper
5925  *
5926  * Description :  Close listenings ports.
5927  *
5928  * Parameters  :
5929  *          1  :  sockets = Array of opened and non-opened sockets to
5930  *                          close. All sockets will be set to
5931  *                          JB_INVALID_SOCKET.
5932  *
5933  * Returns     :  Nothing.
5934  *
5935  *********************************************************************/
5936 static void close_ports_helper(jb_socket sockets[])
5937 {
5938    int i;
5939
5940    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
5941    {
5942       if (JB_INVALID_SOCKET != sockets[i])
5943       {
5944          close_socket(sockets[i]);
5945       }
5946       sockets[i] = JB_INVALID_SOCKET;
5947    }
5948 }
5949
5950
5951 #ifdef _WIN32
5952 /* Without this simple workaround we get this compiler warning from _beginthread
5953  *     warning C4028: formal parameter 1 different from declaration
5954  */
5955 void w32_service_listen_loop(void *p)
5956 {
5957    listen_loop();
5958 }
5959 #endif /* def _WIN32 */
5960
5961
5962 /*********************************************************************
5963  *
5964  * Function    :  listen_loop
5965  *
5966  * Description :  bind the listen port and enter a "FOREVER" listening loop.
5967  *
5968  * Parameters  :  N/A
5969  *
5970  * Returns     :  Never.
5971  *
5972  *********************************************************************/
5973 static void listen_loop(void)
5974 {
5975    struct client_states *csp_list = NULL;
5976    struct client_state *csp = NULL;
5977    jb_socket bfds[MAX_LISTENING_SOCKETS];
5978    struct configuration_spec *config;
5979    unsigned int active_threads = 0;
5980 #if defined(FEATURE_PTHREAD)
5981    pthread_attr_t attrs;
5982
5983    pthread_attr_init(&attrs);
5984    pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
5985 #endif
5986
5987    config = load_config();
5988
5989 #ifdef FEATURE_CONNECTION_SHARING
5990    /*
5991     * XXX: Should be relocated once it no
5992     * longer needs to emit log messages.
5993     */
5994    initialize_reusable_connections();
5995 #endif /* def FEATURE_CONNECTION_SHARING */
5996
5997    bind_ports_helper(config, bfds);
5998
5999 #ifdef FEATURE_GRACEFUL_TERMINATION
6000    while (!g_terminate)
6001 #else
6002    for (;;)
6003 #endif
6004    {
6005 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__)
6006       while (waitpid(-1, NULL, WNOHANG) > 0)
6007       {
6008          /* zombie children */
6009       }
6010 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) */
6011
6012       /*
6013        * Free data that was used by died threads
6014        */
6015       active_threads = sweep();
6016
6017 #if defined(unix)
6018       /*
6019        * Re-open the errlog after HUP signal
6020        */
6021       if (received_hup_signal)
6022       {
6023          if (NULL != config->logfile)
6024          {
6025             init_error_log(Argv[0], config->logfile);
6026          }
6027          received_hup_signal = 0;
6028       }
6029 #endif
6030
6031       csp_list = zalloc_or_die(sizeof(*csp_list));
6032       csp = &csp_list->csp;
6033
6034       log_error(LOG_LEVEL_CONNECT,
6035          "Waiting for the next client connection. Currently active threads: %u",
6036          active_threads);
6037
6038       /*
6039        * This config may be outdated, but for accept_connection()
6040        * it's fresh enough.
6041        */
6042       csp->config = config;
6043
6044       if (!accept_connection(csp, bfds))
6045       {
6046          log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
6047          freez(csp_list);
6048          continue;
6049       }
6050
6051       csp->flags |= CSP_FLAG_ACTIVE;
6052       csp->server_connection.sfd = JB_INVALID_SOCKET;
6053
6054       csp->config = config = load_config();
6055
6056       if (config->need_bind)
6057       {
6058          /*
6059           * Since we were listening to the "old port", we will not see
6060           * a "listen" param change until the next request.  So, at
6061           * least 1 more request must be made for us to find the new
6062           * setting.  I am simply closing the old socket and binding the
6063           * new one.
6064           *
6065           * Which-ever is correct, we will serve 1 more page via the
6066           * old settings.  This should probably be a "show-status"
6067           * request.  This should not be a so common of an operation
6068           * that this will hurt people's feelings.
6069           */
6070
6071          close_ports_helper(bfds);
6072
6073          bind_ports_helper(config, bfds);
6074       }
6075
6076 #ifdef FEATURE_TOGGLE
6077       if (global_toggle_state)
6078 #endif /* def FEATURE_TOGGLE */
6079       {
6080          csp->flags |= CSP_FLAG_TOGGLED_ON;
6081       }
6082
6083       if (run_loader(csp))
6084       {
6085          log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
6086          /* Never get here - LOG_LEVEL_FATAL causes program exit */
6087       }
6088
6089 #ifdef FEATURE_ACL
6090       if (block_acl(NULL,csp))
6091       {
6092          log_error(LOG_LEVEL_CONNECT,
6093             "Connection from %s on %s (socket %d) dropped due to ACL",
6094             csp->ip_addr_str, csp->listen_addr_str, csp->cfd);
6095          close_socket(csp->cfd);
6096          freez(csp->ip_addr_str);
6097          freez(csp->listen_addr_str);
6098          freez(csp_list);
6099          continue;
6100       }
6101 #endif /* def FEATURE_ACL */
6102
6103       if ((0 != config->max_client_connections)
6104          && (active_threads >= config->max_client_connections))
6105       {
6106          log_error(LOG_LEVEL_ERROR,
6107             "Rejecting connection from %s. Maximum number of connections reached.",
6108             csp->ip_addr_str);
6109          write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6110             strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6111          close_socket(csp->cfd);
6112          freez(csp->ip_addr_str);
6113          freez(csp->listen_addr_str);
6114          freez(csp_list);
6115          continue;
6116       }
6117
6118       /* add it to the list of clients */
6119       csp_list->next = clients->next;
6120       clients->next = csp_list;
6121
6122       if (config->multi_threaded)
6123       {
6124          int child_id;
6125
6126 /* this is a switch () statement in the C preprocessor - ugh */
6127 #undef SELECTED_ONE_OPTION
6128
6129 /* Use Pthreads in preference to native code */
6130 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
6131 #define SELECTED_ONE_OPTION
6132          {
6133             pthread_t the_thread;
6134             int ret;
6135
6136             ret = pthread_create(&the_thread, &attrs,
6137                (void * (*)(void *))serve, csp);
6138             child_id = ret ? -1 : 0;
6139          }
6140 #endif
6141
6142 #if defined(_WIN32) && !defined(SELECTED_ONE_OPTION)
6143 #define SELECTED_ONE_OPTION
6144          child_id = _beginthread(
6145             (void (*)(void *))serve,
6146             64 * 1024,
6147             csp);
6148 #endif
6149
6150 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
6151 #define SELECTED_ONE_OPTION
6152          {
6153             thread_id tid = spawn_thread
6154                (server_thread, "server", B_NORMAL_PRIORITY, csp);
6155
6156             if ((tid >= 0) && (resume_thread(tid) == B_OK))
6157             {
6158                child_id = (int) tid;
6159             }
6160             else
6161             {
6162                child_id = -1;
6163             }
6164          }
6165 #endif
6166
6167 #if !defined(SELECTED_ONE_OPTION)
6168          child_id = fork();
6169
6170          /* This block is only needed when using fork().
6171           * When using threads, the server thread was
6172           * created and run by the call to _beginthread().
6173           */
6174          if (child_id == 0)   /* child */
6175          {
6176             int rc = 0;
6177 #ifdef FEATURE_TOGGLE
6178             int inherited_toggle_state = global_toggle_state;
6179 #endif /* def FEATURE_TOGGLE */
6180
6181             serve(csp);
6182
6183             /*
6184              * If we've been toggled or we've blocked the request, tell Mom
6185              */
6186
6187 #ifdef FEATURE_TOGGLE
6188             if (inherited_toggle_state != global_toggle_state)
6189             {
6190                rc |= RC_FLAG_TOGGLED;
6191             }
6192 #endif /* def FEATURE_TOGGLE */
6193
6194 #ifdef FEATURE_STATISTICS
6195             if (csp->flags & CSP_FLAG_REJECTED)
6196             {
6197                rc |= RC_FLAG_BLOCKED;
6198             }
6199 #endif /* ndef FEATURE_STATISTICS */
6200
6201             _exit(rc);
6202          }
6203          else if (child_id > 0) /* parent */
6204          {
6205             /* in a fork()'d environment, the parent's
6206              * copy of the client socket and the CSP
6207              * are not used.
6208              */
6209             int child_status;
6210 #if !defined(_WIN32) && !defined(__CYGWIN__)
6211
6212             wait(&child_status);
6213
6214             /*
6215              * Evaluate child's return code: If the child has
6216              *  - been toggled, toggle ourselves
6217              *  - blocked its request, bump up the stats counter
6218              */
6219
6220 #ifdef FEATURE_TOGGLE
6221             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
6222             {
6223                global_toggle_state = !global_toggle_state;
6224             }
6225 #endif /* def FEATURE_TOGGLE */
6226
6227 #ifdef FEATURE_STATISTICS
6228             urls_read++;
6229             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
6230             {
6231                urls_rejected++;
6232             }
6233 #endif /* def FEATURE_STATISTICS */
6234
6235 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
6236             close_socket(csp->cfd);
6237             csp->flags &= ~CSP_FLAG_ACTIVE;
6238          }
6239 #endif
6240
6241 #undef SELECTED_ONE_OPTION
6242 /* end of cpp switch () */
6243
6244          if (child_id < 0)
6245          {
6246             /*
6247              * Spawning the child failed, assume it's because
6248              * there are too many children running already.
6249              * XXX: If you assume ...
6250              */
6251             log_error(LOG_LEVEL_ERROR,
6252                "Unable to take any additional connections: %E. Active threads: %u",
6253                active_threads);
6254             write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6255                strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6256             close_socket(csp->cfd);
6257             csp->flags &= ~CSP_FLAG_ACTIVE;
6258          }
6259       }
6260       else
6261       {
6262          serve(csp);
6263       }
6264    }
6265
6266 #if defined(FEATURE_PTHREAD)
6267    pthread_attr_destroy(&attrs);
6268 #endif
6269
6270    /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
6271
6272 #ifdef FEATURE_GRACEFUL_TERMINATION
6273
6274    log_error(LOG_LEVEL_INFO, "Graceful termination requested.");
6275
6276    unload_current_config_file();
6277    unload_current_actions_file();
6278    unload_current_re_filterfile();
6279 #ifdef FEATURE_TRUST
6280    unload_current_trust_file();
6281 #endif
6282
6283    if (config->multi_threaded)
6284    {
6285       int i = 60;
6286       do
6287       {
6288          sleep(1);
6289          sweep();
6290       } while ((clients->next != NULL) && (--i > 0));
6291
6292       if (i <= 0)
6293       {
6294          log_error(LOG_LEVEL_ERROR, "Graceful termination failed "
6295             "- still some live clients after 1 minute wait.");
6296       }
6297    }
6298    sweep();
6299    sweep();
6300
6301 #if defined(unix)
6302    freez(basedir);
6303 #endif
6304
6305 #ifdef FEATURE_HTTPS_INSPECTION
6306    /*
6307     * Only release TLS backed resources if there
6308     * are no active connections left.
6309     */
6310    if (clients->next == NULL)
6311    {
6312       ssl_release();
6313    }
6314 #endif
6315
6316    log_error(LOG_LEVEL_INFO, "Exiting gracefully.");
6317
6318 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
6319    /* Cleanup - remove taskbar icon etc. */
6320    TermLogWindow();
6321 #endif
6322
6323    exit(0);
6324 #endif /* FEATURE_GRACEFUL_TERMINATION */
6325
6326 }
6327
6328
6329 /*
6330   Local Variables:
6331   tab-width: 3
6332   end:
6333 */