webcit/webserver.c

   1 /*
   2  * $Id$
   3  *
   4  * This contains a simple multithreaded TCP server manager.  It sits around
   5  * waiting on the specified port for incoming HTTP connections.  When a
   6  * connection is established, it calls context_loop() from context_loop.c.
   7  *
   8  * Copyright (c) 1996-2010 by the citadel.org developers.
   9  * This program is released under the terms of the GNU General Public License v3.
  10  *
  11  */
  12
  13 #include "webcit.h"
  14 #include "webserver.h"
  15
  16 #if HAVE_BACKTRACE
  17 #include <execinfo.h>
  18 #endif
  19 #include "modules_init.h"
  20 #ifndef HAVE_SNPRINTF
  21 int vsnprintf(char *buf, size_t max, const char *fmt, va_list argp);
  22 #endif
  23
  24 int verbosity = 9;              /* Logging level */
  25 int msock;                      /* master listening socket */
  26 int is_https = 0;               /* Nonzero if I am an HTTPS service */
  27 int follow_xff = 0;             /* Follow X-Forwarded-For: header */
  28 int home_specified = 0;         /* did the user specify a homedir? */
  29 int time_to_die = 0;            /* Nonzero if server is shutting down */
  30 int DisableGzip = 0;
  31 extern void *context_loop(ParsedHttpHdrs *Hdr);
  32 extern void *housekeeping_loop(void);
  33 extern pthread_mutex_t SessionListMutex;
  34 extern pthread_key_t MyConKey;
  35
  36 extern int ig_tcp_server(char *ip_addr, int port_number, int queue_len);
  37 extern int ig_uds_server(char *sockpath, int queue_len);
  38
  39 extern void drop_root(uid_t UID);
  40
  41 char ctdl_key_dir[PATH_MAX]=SSL_DIR;
  42 char file_crpt_file_key[PATH_MAX]="";
  43 char file_crpt_file_csr[PATH_MAX]="";
  44 char file_crpt_file_cer[PATH_MAX]="";
  45
  46 char socket_dir[PATH_MAX];                      /* where to talk to our citadel server */
  47 const char editor_absolut_dir[PATH_MAX]=EDITORDIR;      /* nailed to what configure gives us. */
  48 char static_dir[PATH_MAX];              /* calculated on startup */
  49 char static_local_dir[PATH_MAX];                /* calculated on startup */
  50 char static_icon_dir[PATH_MAX];          /* where should we find our mime icons? */
  51 char  *static_dirs[]={                          /* needs same sort order as the web mapping */
  52         (char*)static_dir,                      /* our templates on disk */
  53         (char*)static_local_dir,                /* user provided templates disk */
  54         (char*)editor_absolut_dir,              /* the editor on disk */
  55         (char*)static_icon_dir                  /* our icons... */
  56 };
  57
  58 /*
  59  * Subdirectories from which the client may request static content
  60  *
  61  * (If you add more, remember to increment 'ndirs' below)
  62  */
  63 char *static_content_dirs[] = {
  64         "static",                     /* static templates */
  65         "static.local",               /* site local static templates */
  66         "tiny_mce"                    /* rich text editor */
  67 };
  68
  69 int ndirs=3;
  70
  71
  72 char *server_cookie = NULL;     /* our Cookie connection to the client */
  73 int http_port = PORT_NUM;       /* Port to listen on */
  74 char *ctdlhost = DEFAULT_HOST;  /* our name */
  75 char *ctdlport = DEFAULT_PORT;  /* our Port */
  76 int setup_wizard = 0;           /* should we run the setup wizard? \todo */
  77 char wizard_filename[PATH_MAX]; /* where's the setup wizard? */
  78 int running_as_daemon = 0;      /* should we deamonize on startup? */
  79
  80
  81
  82 /*
  83  * Shut us down the regular way.
  84  * signum is the signal we want to forward
  85  */
  86 pid_t current_child;
  87 void graceful_shutdown_watcher(int signum) {
  88         lprintf (1, "bye; shutting down watcher.");
  89         kill(current_child, signum);
  90         if (signum != SIGHUP)
  91                 exit(0);
  92 }
  93
  94
  95
  96
  97 /*
  98  * Shut us down the regular way.
  99  * signum is the signal we want to forward
 100  */
 101 pid_t current_child;
 102 void graceful_shutdown(int signum) {
 103         FILE *FD;
 104         int fd;
 105
 106         lprintf (1, "WebCit is being shut down on signal %d.\n", signum);
 107         fd = msock;
 108         msock = -1;
 109         time_to_die = 1;
 110         FD=fdopen(fd, "a+");
 111         fflush (FD);
 112         fclose (FD);
 113         close(fd);
 114 }
 115
 116
 117 /*
 118  * Start running as a daemon.
 119  */
 120 void start_daemon(char *pid_file)
 121 {
 122         int status = 0;
 123         pid_t child = 0;
 124         FILE *fp;
 125         int do_restart = 0;
 126         int rv;
 127         FILE *rvfp = NULL;
 128
 129         current_child = 0;
 130
 131         /* Close stdin/stdout/stderr and replace them with /dev/null.
 132          * We don't just call close() because we don't want these fd's
 133          * to be reused for other files.
 134          */
 135         rv = chdir("/");
 136
 137         signal(SIGHUP, SIG_IGN);
 138         signal(SIGINT, SIG_IGN);
 139         signal(SIGQUIT, SIG_IGN);
 140
 141         child = fork();
 142         if (child != 0) {
 143                 exit(0);
 144         }
 145
 146         setsid();
 147         umask(0);
 148         rvfp = freopen("/dev/null", "r", stdin);
 149         rvfp = freopen("/dev/null", "w", stdout);
 150         rvfp = freopen("/dev/null", "w", stderr);
 151         signal(SIGTERM, graceful_shutdown_watcher);
 152         signal(SIGHUP, graceful_shutdown_watcher);
 153
 154         do {
 155                 current_child = fork();
 156
 157
 158                 if (current_child < 0) {
 159                         perror("fork");
 160                         ShutDownLibCitadel ();
 161                         exit(errno);
 162                 }
 163
 164                 else if (current_child == 0) {  /* child process */
 165                         signal(SIGHUP, graceful_shutdown);
 166
 167                         return; /* continue starting webcit. */
 168                 }
 169                 else { /* watcher process */
 170                         if (pid_file) {
 171                                 fp = fopen(pid_file, "w");
 172                                 if (fp != NULL) {
 173                                         fprintf(fp, "%d\n", getpid());
 174                                         fclose(fp);
 175                                 }
 176                         }
 177                         waitpid(current_child, &status, 0);
 178                 }
 179
 180                 do_restart = 0;
 181
 182                 /* Did the main process exit with an actual exit code? */
 183                 if (WIFEXITED(status)) {
 184
 185                         /* Exit code 0 means the watcher should exit */
 186                         if (WEXITSTATUS(status) == 0) {
 187                                 do_restart = 0;
 188                         }
 189
 190                         /* Exit code 101-109 means the watcher should exit */
 191                         else if ( (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109) ) {
 192                                 do_restart = 0;
 193                         }
 194
 195                         /* Any other exit code means we should restart. */
 196                         else {
 197                                 do_restart = 1;
 198                         }
 199                 }
 200
 201                 /* Any other type of termination (signals, etc.) should also restart. */
 202                 else {
 203                         do_restart = 1;
 204                 }
 205
 206         } while (do_restart);
 207
 208         if (pid_file) {
 209                 unlink(pid_file);
 210         }
 211         ShutDownLibCitadel ();
 212         exit(WEXITSTATUS(status));
 213 }
 214
 215 /*
 216  * Spawn an additional worker thread into the pool.
 217  */
 218 void spawn_another_worker_thread()
 219 {
 220         pthread_t SessThread;   /* Thread descriptor */
 221         pthread_attr_t attr;    /* Thread attributes */
 222         int ret;
 223
 224         lprintf(3, "Creating a new thread.  Pool size is now %d\n", ++num_threads);
 225
 226         /* set attributes for the new thread */
 227         pthread_attr_init(&attr);
 228         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 229
 230         /*
 231          * Our per-thread stacks need to be bigger than the default size,
 232          * otherwise the MIME parser crashes on FreeBSD.
 233          */
 234         if ((ret = pthread_attr_setstacksize(&attr, 1024 * 1024))) {
 235                 lprintf(1, "pthread_attr_setstacksize: %s\n",
 236                         strerror(ret));
 237                 pthread_attr_destroy(&attr);
 238         }
 239
 240         /* now create the thread */
 241         if (pthread_create(&SessThread, &attr,
 242                            (void *(*)(void *)) worker_entry, NULL)
 243             != 0) {
 244                 lprintf(1, "Can't create thread: %s\n", strerror(errno));
 245         }
 246
 247         /* free up the attributes */
 248         pthread_attr_destroy(&attr);
 249 }
 250
 251 /* #define DBG_PRINNT_HOOKS_AT_START */
 252 #ifdef DBG_PRINNT_HOOKS_AT_START
 253 const char foobuf[32];
 254 const char *nix(void *vptr) {snprintf(foobuf, 32, "%0x", (long) vptr); return foobuf;}
 255 #endif
 256 extern int dbg_analyze_msg;
 257 extern int dbg_bactrace_template_errors;
 258 extern int DumpTemplateI18NStrings;
 259 extern StrBuf *I18nDump;
 260 void InitTemplateCache(void);
 261 extern int LoadTemplates;
 262
 263 extern HashList *HandlerHash;
 264
 265
 266
 267 void
 268 webcit_calc_dirs_n_files(int relh, const char *basedir, int home, char *webcitdir, char *relhome)
 269 {
 270         char dirbuffer[PATH_MAX]="";
 271         /* calculate all our path on a central place */
 272     /* where to keep our config */
 273
 274 #define COMPUTE_DIRECTORY(SUBDIR) memcpy(dirbuffer,SUBDIR, sizeof dirbuffer);\
 275         snprintf(SUBDIR,sizeof SUBDIR,  "%s%s%s%s%s%s%s", \
 276                          (home&!relh)?webcitdir:basedir, \
 277              ((basedir!=webcitdir)&(home&!relh))?basedir:"/", \
 278              ((basedir!=webcitdir)&(home&!relh))?"/":"", \
 279                          relhome, \
 280              (relhome[0]!='\0')?"/":"",\
 281                          dirbuffer,\
 282                          (dirbuffer[0]!='\0')?"/":"");
 283         basedir=RUNDIR;
 284         COMPUTE_DIRECTORY(socket_dir);
 285         basedir=WWWDIR "/static";
 286         COMPUTE_DIRECTORY(static_dir);
 287         basedir=WWWDIR "/static/icons";
 288         COMPUTE_DIRECTORY(static_icon_dir);
 289         basedir=WWWDIR "/static.local";
 290         COMPUTE_DIRECTORY(static_local_dir);
 291         StripSlashes(static_dir, 1);
 292         StripSlashes(static_icon_dir, 1);
 293         StripSlashes(static_local_dir, 1);
 294
 295         snprintf(file_crpt_file_key,
 296                  sizeof file_crpt_file_key,
 297                  "%s/citadel.key",
 298                  ctdl_key_dir);
 299         snprintf(file_crpt_file_csr,
 300                  sizeof file_crpt_file_csr,
 301                  "%s/citadel.csr",
 302                  ctdl_key_dir);
 303         snprintf(file_crpt_file_cer,
 304                  sizeof file_crpt_file_cer,
 305                  "%s/citadel.cer",
 306                  ctdl_key_dir);
 307
 308         /* we should go somewhere we can leave our coredump, if enabled... */
 309         lprintf(9, "Changing directory to %s\n", socket_dir);
 310         if (chdir(webcitdir) != 0) {
 311                 perror("chdir");
 312         }
 313 }
 314 /*
 315  * Here's where it all begins.
 316  */
 317 int main(int argc, char **argv)
 318 {
 319         uid_t UID = -1;
 320         size_t basesize = 2;            /* how big should strbufs be on creation? */
 321         pthread_t SessThread;           /* Thread descriptor */
 322         pthread_attr_t attr;            /* Thread attributes */
 323         int a, i;                       /* General-purpose variables */
 324         char tracefile[PATH_MAX];
 325         char ip_addr[256]="0.0.0.0";
 326         int relh=0;
 327         int home=0;
 328         int home_specified=0;
 329         char relhome[PATH_MAX]="";
 330         char webcitdir[PATH_MAX] = DATADIR;
 331         char *pidfile = NULL;
 332         char *hdir;
 333         const char *basedir = NULL;
 334         char uds_listen_path[PATH_MAX]; /* listen on a unix domain socket? */
 335         const char *I18nDumpFile = NULL;
 336         FILE *rvfp = NULL;
 337         int rv = 0;
 338
 339         WildFireInitBacktrace(argv[0], 2);
 340
 341         start_modules ();
 342
 343 #ifdef DBG_PRINNT_HOOKS_AT_START
 344 /*      dbg_PrintHash(HandlerHash, nix, NULL);*/
 345 #endif
 346
 347         /* Ensure that we are linked to the correct version of libcitadel */
 348         if (libcitadel_version_number() < LIBCITADEL_VERSION_NUMBER) {
 349                 fprintf(stderr, " You are running libcitadel version %d.%02d\n",
 350                         (libcitadel_version_number() / 100), (libcitadel_version_number() % 100));
 351                 fprintf(stderr, "WebCit was compiled against version %d.%02d\n",
 352                         (LIBCITADEL_VERSION_NUMBER / 100), (LIBCITADEL_VERSION_NUMBER % 100));
 353                 return(1);
 354         }
 355
 356         strcpy(uds_listen_path, "");
 357
 358         /* Parse command line */
 359 #ifdef HAVE_OPENSSL
 360         while ((a = getopt(argc, argv, "u:h:i:p:t:T:B:x:dD:G:cfsS:Z")) != EOF)
 361 #else
 362         while ((a = getopt(argc, argv, "u:h:i:p:t:T:B:x:dD:G:cfZ")) != EOF)
 363 #endif
 364                 switch (a) {
 365                 case 'u':
 366                         UID = atol(optarg);
 367                         break;
 368                 case 'h':
 369                         hdir = strdup(optarg);
 370                         relh=hdir[0]!='/';
 371                         if (!relh) {
 372                                 safestrncpy(webcitdir, hdir, sizeof webcitdir);
 373                         }
 374                         else {
 375                                 safestrncpy(relhome, relhome, sizeof relhome);
 376                         }
 377                         /* free(hdir); TODO: SHOULD WE DO THIS? */
 378                         home_specified = 1;
 379                         home=1;
 380                         break;
 381                 case 'd':
 382                         running_as_daemon = 1;
 383                         break;
 384                 case 'D':
 385                         pidfile = strdup(optarg);
 386                         running_as_daemon = 1;
 387                         break;
 388                 case 'B': /* Basesize */
 389                         basesize = atoi(optarg);
 390                         if (basesize > 2)
 391                                 StartLibCitadel(basesize);
 392                         break;
 393                 case 'i':
 394                         safestrncpy(ip_addr, optarg, sizeof ip_addr);
 395                         break;
 396                 case 'p':
 397                         http_port = atoi(optarg);
 398                         if (http_port == 0) {
 399                                 safestrncpy(uds_listen_path, optarg, sizeof uds_listen_path);
 400                         }
 401                         break;
 402                 case 't':
 403                         safestrncpy(tracefile, optarg, sizeof tracefile);
 404                         rvfp = freopen(tracefile, "w", stdout);
 405                         rvfp = freopen(tracefile, "w", stderr);
 406                         rvfp = freopen(tracefile, "r", stdin);
 407                         break;
 408                 case 'T':
 409                         LoadTemplates = atoi(optarg);
 410                         dbg_analyze_msg = (LoadTemplates && (1<<1)) != 0;
 411                         dbg_bactrace_template_errors = (LoadTemplates && (1<<2)) != 0;
 412                         break;
 413                 case 'Z':
 414                         DisableGzip = 1;
 415                         break;
 416                 case 'x':
 417                         verbosity = atoi(optarg);
 418                         break;
 419                 case 'f':
 420                         follow_xff = 1;
 421                         break;
 422                 case 'c':
 423                         server_cookie = malloc(256);
 424                         if (server_cookie != NULL) {
 425                                 safestrncpy(server_cookie,
 426                                        "Set-cookie: wcserver=",
 427                                         256);
 428                                 if (gethostname
 429                                     (&server_cookie[strlen(server_cookie)],
 430                                      200) != 0) {
 431                                         lprintf(2, "gethostname: %s\n",
 432                                                 strerror(errno));
 433                                         free(server_cookie);
 434                                 }
 435                         }
 436                         break;
 437 #ifdef HAVE_OPENSSL
 438                 case 's':
 439                         is_https = 1;
 440                         break;
 441                 case 'S':
 442                         is_https = 1;
 443                         ssl_cipher_list = strdup(optarg);
 444                         break;
 445 #endif
 446                 case 'G':
 447                         DumpTemplateI18NStrings = 1;
 448                         I18nDump = NewStrBufPlain(HKEY("int templatestrings(void)\n{\n"));
 449                         I18nDumpFile = optarg;
 450                         break;
 451                 default:
 452                         fprintf(stderr, "usage: webcit "
 453                                 "[-i ip_addr] [-p http_port] "
 454                                 "[-t tracefile] [-c] [-f] "
 455                                 "[-T Templatedebuglevel] "
 456                                 "[-d] [-Z] [-G i18ndumpfile] "
 457 #ifdef HAVE_OPENSSL
 458                                 "[-s] [-S cipher_suites]"
 459 #endif
 460                                 "[remotehost [remoteport]]\n");
 461                         return 1;
 462                 }
 463
 464         if (optind < argc) {
 465                 ctdlhost = argv[optind];
 466                 if (++optind < argc)
 467                         ctdlport = argv[optind];
 468         }
 469
 470         /* daemonize, if we were asked to */
 471         if (!DumpTemplateI18NStrings && running_as_daemon) {
 472                 start_daemon(pidfile);
 473         }
 474         else {
 475                 signal(SIGHUP, graceful_shutdown);
 476         }
 477
 478         webcit_calc_dirs_n_files(relh, basedir, home, webcitdir, relhome);
 479         LoadIconDir(static_icon_dir);
 480
 481         /* Tell 'em who's in da house */
 482         lprintf(1, PACKAGE_STRING "\n");
 483         lprintf(1, "Copyright (C) 1996-2010 by the Citadel development team.\n"
 484                 "This software is distributed under the terms of the "
 485                 "GNU General Public License.\n\n"
 486         );
 487
 488
 489         /* initialize the International Bright Young Thing */
 490
 491         initialise_modules();
 492         initialize_viewdefs();
 493         initialize_axdefs();
 494
 495         InitTemplateCache();
 496         if (DumpTemplateI18NStrings) {
 497                 FILE *fd;
 498                 StrBufAppendBufPlain(I18nDump, HKEY("}\n"), 0);
 499                 if (StrLength(I18nDump) < 50) {
 500                         lprintf(1, "********************************************************************************\n");
 501                         lprintf(1, "*        No strings found in templates! are you shure they're there?           *\n");
 502                         lprintf(1, "********************************************************************************\n");
 503                         return -1;
 504                 }
 505                 fd = fopen(I18nDumpFile, "w");
 506                 if (fd == NULL) {
 507                         lprintf(1, "********************************************************************************\n");
 508                         lprintf(1, "*                  unable to open I18N dumpfile [%s]         *\n", I18nDumpFile);
 509                         lprintf(1, "********************************************************************************\n");
 510                         return -1;
 511                 }
 512                 rv = fwrite(ChrPtr(I18nDump), 1, StrLength(I18nDump), fd);
 513                 fclose(fd);
 514                 return 0;
 515         }
 516
 517
 518         /* Tell libical to return an error instead of aborting if it sees badly formed iCalendar data. */
 519         icalerror_errors_are_fatal = 0;
 520
 521         /* Use our own prefix on tzid's generated from system tzdata */
 522         icaltimezone_set_tzid_prefix("/citadel.org/");
 523
 524         /*
 525          * Set up a place to put thread-specific data.
 526          * We only need a single pointer per thread - it points to the
 527          * wcsession struct to which the thread is currently bound.
 528          */
 529         if (pthread_key_create(&MyConKey, NULL) != 0) {
 530                 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
 531         }
 532         InitialiseSemaphores ();
 533
 534         /*
 535          * Set up a place to put thread-specific SSL data.
 536          * We don't stick this in the wcsession struct because SSL starts
 537          * up before the session is bound, and it gets torn down between
 538          * transactions.
 539          */
 540 #ifdef HAVE_OPENSSL
 541         if (pthread_key_create(&ThreadSSL, NULL) != 0) {
 542                 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
 543         }
 544 #endif
 545
 546         /*
 547          * Bind the server to our favorite port.
 548          * There is no need to check for errors, because ig_tcp_server()
 549          * exits if it doesn't succeed.
 550          */
 551
 552         if (!IsEmptyStr(uds_listen_path)) {
 553                 lprintf(2, "Attempting to create listener socket at %s...\n", uds_listen_path);
 554                 msock = ig_uds_server(uds_listen_path, LISTEN_QUEUE_LENGTH);
 555         }
 556         else {
 557                 lprintf(2, "Attempting to bind to port %d...\n", http_port);
 558                 msock = ig_tcp_server(ip_addr, http_port, LISTEN_QUEUE_LENGTH);
 559         }
 560         if (msock < 0)
 561         {
 562                 ShutDownWebcit();
 563                 return -msock;
 564         }
 565
 566         lprintf(2, "Listening on socket %d\n", msock);
 567         signal(SIGPIPE, SIG_IGN);
 568
 569         pthread_mutex_init(&SessionListMutex, NULL);
 570
 571         /*
 572          * Start up the housekeeping thread
 573          */
 574         pthread_attr_init(&attr);
 575         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 576         pthread_create(&SessThread, &attr,
 577                        (void *(*)(void *)) housekeeping_loop, NULL);
 578
 579
 580         /*
 581          * If this is an HTTPS server, fire up SSL
 582          */
 583 #ifdef HAVE_OPENSSL
 584         if (is_https) {
 585                 init_ssl();
 586         }
 587 #endif
 588         drop_root(UID);
 589
 590         /* Start a few initial worker threads */
 591         for (i = 0; i < (MIN_WORKER_THREADS); ++i) {
 592                 spawn_another_worker_thread();
 593         }
 594
 595         /* now the original thread becomes another worker */
 596         worker_entry();
 597         ShutDownLibCitadel ();
 598         return 0;
 599 }
 600
 601
 602 void ShutDownWebcit(void)
 603 {
 604         free_zone_directory ();
 605         icaltimezone_release_zone_tab ();
 606         icalmemory_free_ring ();
 607         ShutDownLibCitadel ();
 608         shutdown_modules ();
 609 #ifdef HAVE_OPENSSL
 610         if (is_https) {
 611                 shutdown_ssl();
 612         }
 613 #endif
 614 }
 615
 616 /*
 617  * Entry point for worker threads
 618  */
 619 void worker_entry(void)
 620 {
 621         int ssock;
 622         int i = 0;
 623         int fail_this_transaction = 0;
 624         int ret;
 625         struct timeval tv;
 626         fd_set readset, tempset;
 627         ParsedHttpHdrs Hdr;
 628
 629         memset(&Hdr, 0, sizeof(ParsedHttpHdrs));
 630         Hdr.HR.eReqType = eGET;
 631         http_new_modules(&Hdr);
 632         tv.tv_sec = 0;
 633         tv.tv_usec = 10000;
 634         FD_ZERO(&readset);
 635         FD_SET(msock, &readset);
 636
 637         do {
 638                 /* Only one thread can accept at a time */
 639                 fail_this_transaction = 0;
 640                 ssock = -1;
 641                 errno = EAGAIN;
 642                 do {
 643                         ret = -1; /* just one at once should select... */
 644                         begin_critical_section(S_SELECT);
 645
 646                         FD_ZERO(&tempset);
 647                         if (msock > 0) FD_SET(msock, &tempset);
 648                         tv.tv_sec = 0;
 649                         tv.tv_usec = 10000;
 650                         if (msock > 0)  ret = select(msock+1, &tempset, NULL, NULL,  &tv);
 651                         end_critical_section(S_SELECT);
 652                         if ((ret < 0) && (errno != EINTR) && (errno != EAGAIN))
 653                         {/* EINTR and EAGAIN are thrown but not of interest. */
 654                                 lprintf(2, "accept() failed:%d %s\n",
 655                                         errno, strerror(errno));
 656                         }
 657                         else if ((ret > 0) && (msock > 0) && FD_ISSET(msock, &tempset))
 658                         {/* Successfully selected, and still not shutting down? Accept! */
 659                                 ssock = accept(msock, NULL, 0);
 660                         }
 661
 662                 } while ((msock > 0) && (ssock < 0)  && (time_to_die == 0));
 663
 664                 if ((msock == -1)||(time_to_die))
 665                 {/* ok, we're going down. */
 666                         int shutdown = 0;
 667
 668                         /* the first to come here will have to do the cleanup.
 669                          * make shure its realy just one.
 670                          */
 671                         begin_critical_section(S_SHUTDOWN);
 672                         if (msock == -1)
 673                         {
 674                                 msock = -2;
 675                                 shutdown = 1;
 676                         }
 677                         end_critical_section(S_SHUTDOWN);
 678                         if (shutdown == 1)
 679                         {/* we're the one to cleanup the mess. */
 680                                 http_destroy_modules(&Hdr);
 681                                 lprintf(2, "I'm master shutdown: tagging sessions to be killed.\n");
 682                                 shutdown_sessions();
 683                                 lprintf(2, "master shutdown: waiting for others\n");
 684                                 sleeeeeeeeeep(1); /* wait so some others might finish... */
 685                                 lprintf(2, "master shutdown: cleaning up sessions\n");
 686                                 do_housekeeping();
 687                                 lprintf(2, "master shutdown: cleaning up libical\n");
 688
 689                                 ShutDownWebcit();
 690
 691                                 lprintf(2, "master shutdown exiting!.\n");
 692                                 exit(0);
 693                         }
 694                         break;
 695                 }
 696                 if (ssock < 0 ) continue;
 697
 698                 if (msock < 0) {
 699                         if (ssock > 0) close (ssock);
 700                         lprintf(2, "inbetween.");
 701                         pthread_exit(NULL);
 702                 } else { /* Got it? do some real work! */
 703                         /* Set the SO_REUSEADDR socket option */
 704                         i = 1;
 705                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR,
 706                                    &i, sizeof(i));
 707
 708                         /* If we are an HTTPS server, go crypto now. */
 709 #ifdef HAVE_OPENSSL
 710                         if (is_https) {
 711                                 if (starttls(ssock) != 0) {
 712                                         fail_this_transaction = 1;
 713                                         close(ssock);
 714                                 }
 715                         }
 716                         else
 717 #endif
 718                         {
 719                                 int fdflags;
 720                                 fdflags = fcntl(ssock, F_GETFL);
 721                                 if (fdflags < 0)
 722                                         lprintf(1, "unable to get server socket flags! %s \n",
 723                                                 strerror(errno));
 724                                 fdflags = fdflags | O_NONBLOCK;
 725                                 if (fcntl(ssock, F_SETFL, fdflags) < 0)
 726                                         lprintf(1, "unable to set server socket nonblocking flags! %s \n",
 727                                                 strerror(errno));
 728                         }
 729
 730                         if (fail_this_transaction == 0) {
 731                                 Hdr.http_sock = ssock;
 732
 733                                 /* Perform an HTTP transaction... */
 734                                 context_loop(&Hdr);
 735
 736                                 /* Shut down SSL/TLS if required... */
 737 #ifdef HAVE_OPENSSL
 738                                 if (is_https) {
 739                                         endtls();
 740                                 }
 741 #endif
 742
 743                                 /* ...and close the socket. */
 744                                 if (Hdr.http_sock > 0)
 745                                         lingering_close(ssock);
 746                                 http_detach_modules(&Hdr);
 747
 748                         }
 749
 750                 }
 751
 752         } while (!time_to_die);
 753
 754         http_destroy_modules(&Hdr);
 755         lprintf (1, "bye\n");
 756         pthread_exit(NULL);
 757 }
 758
 759 /*
 760  * print log messages
 761  * logs to stderr if loglevel is lower than the verbosity set at startup
 762  *
 763  * loglevel     level of the message
 764  * format       the printf like format string
 765  * ...          the strings to put into format
 766  */
 767 int lprintf(int loglevel, const char *format, ...)
 768 {
 769         va_list ap;
 770
 771         if (loglevel <= verbosity) {
 772                 va_start(ap, format);
 773                 vfprintf(stderr, format, ap);
 774                 va_end(ap);
 775                 fflush(stderr);
 776         }
 777         return 1;
 778 }
 779
 780
 781 /*
 782  * print the actual stack frame.
 783  */
 784 void wc_backtrace(void)
 785 {
 786 #ifdef HAVE_BACKTRACE
 787         void *stack_frames[50];
 788         size_t size, i;
 789         char **strings;
 790
 791
 792         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
 793         strings = backtrace_symbols(stack_frames, size);
 794         for (i = 0; i < size; i++) {
 795                 if (strings != NULL)
 796                         lprintf(1, "%s\n", strings[i]);
 797                 else
 798                         lprintf(1, "%p\n", stack_frames[i]);
 799         }
 800         free(strings);
 801 #endif
 802 }
 803
 804
 805
 806