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  */
   9
  10 #include "webcit.h"
  11 #include "webserver.h"
  12
  13 #if HAVE_BACKTRACE
  14 #include <execinfo.h>
  15 #endif
  16 #include "modules_init.h"
  17 #ifndef HAVE_SNPRINTF
  18 int vsnprintf(char *buf, size_t max, const char *fmt, va_list argp);
  19 #endif
  20
  21 int verbosity = 9;              /* Logging level */
  22 int msock;                      /* master listening socket */
  23 int is_https = 0;               /* Nonzero if I am an HTTPS service */
  24 int follow_xff = 0;             /* Follow X-Forwarded-For: header */
  25 int home_specified = 0;         /* did the user specify a homedir? */
  26 int time_to_die = 0;            /* Nonzero if server is shutting down */
  27 extern void *context_loop(int*);
  28 extern void *housekeeping_loop(void);
  29 extern pthread_mutex_t SessionListMutex;
  30 extern pthread_key_t MyConKey;
  31
  32
  33 char ctdl_key_dir[PATH_MAX]=SSL_DIR;
  34 char file_crpt_file_key[PATH_MAX]="";
  35 char file_crpt_file_csr[PATH_MAX]="";
  36 char file_crpt_file_cer[PATH_MAX]="";
  37
  38 char socket_dir[PATH_MAX];                      /* where to talk to our citadel server */
  39 static const char editor_absolut_dir[PATH_MAX]=EDITORDIR;       /* nailed to what configure gives us. */
  40 static char static_dir[PATH_MAX];               /* calculated on startup */
  41 static char static_local_dir[PATH_MAX];         /* calculated on startup */
  42 static char static_icon_dir[PATH_MAX];          /* where should we find our mime icons? */
  43 char  *static_dirs[]={                          /* needs same sort order as the web mapping */
  44         (char*)static_dir,                      /* our templates on disk */
  45         (char*)static_local_dir,                /* user provided templates disk */
  46         (char*)editor_absolut_dir,              /* the editor on disk */
  47         (char*)static_icon_dir                  /* our icons... */
  48 };
  49
  50 /*
  51  * Subdirectories from which the client may request static content
  52  *
  53  * (If you add more, remember to increment 'ndirs' below)
  54  */
  55 char *static_content_dirs[] = {
  56         "static",                     /* static templates */
  57         "static.local",               /* site local static templates */
  58         "tiny_mce"                    /* rich text editor */
  59 };
  60
  61 int ndirs=3;
  62
  63
  64 char *server_cookie = NULL;     /* our Cookie connection to the client */
  65 int http_port = PORT_NUM;       /* Port to listen on */
  66 char *ctdlhost = DEFAULT_HOST;  /* our name */
  67 char *ctdlport = DEFAULT_PORT;  /* our Port */
  68 int setup_wizard = 0;           /* should we run the setup wizard? \todo */
  69 char wizard_filename[PATH_MAX]; /* where's the setup wizard? */
  70 int running_as_daemon = 0;      /* should we deamonize on startup? */
  71
  72
  73 /*
  74  * This is a generic function to set up a master socket for listening on
  75  * a TCP port.  The server shuts down if the bind fails.
  76  *
  77  * ip_addr      IP address to bind
  78  * port_number  port number to bind
  79  * queue_len    number of incoming connections to allow in the queue
  80  */
  81 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
  82 {
  83         struct sockaddr_in sin;
  84         int s, i;
  85
  86         memset(&sin, 0, sizeof(sin));
  87         sin.sin_family = AF_INET;
  88         if (ip_addr == NULL) {
  89                 sin.sin_addr.s_addr = INADDR_ANY;
  90         } else {
  91                 sin.sin_addr.s_addr = inet_addr(ip_addr);
  92         }
  93
  94         if (sin.sin_addr.s_addr == INADDR_NONE) {
  95                 sin.sin_addr.s_addr = INADDR_ANY;
  96         }
  97
  98         if (port_number == 0) {
  99                 lprintf(1, "Cannot start: no port number specified.\n");
 100                 exit(WC_EXIT_BIND);
 101         }
 102         sin.sin_port = htons((u_short) port_number);
 103
 104         s = socket(PF_INET, SOCK_STREAM, (getprotobyname("tcp")->p_proto));
 105         if (s < 0) {
 106                 lprintf(1, "Can't create a socket: %s\n", strerror(errno));
 107                 exit(WC_EXIT_BIND);
 108         }
 109         /* Set some socket options that make sense. */
 110         i = 1;
 111         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 112
 113         fcntl(s, F_SETFL, O_NONBLOCK); /* maide: this statement is incorrect
 114                                           there should be a preceding F_GETFL
 115                                           and a bitwise OR with the previous
 116                                           fd flags */
 117
 118         if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 119                 lprintf(1, "Can't bind: %s\n", strerror(errno));
 120                 exit(WC_EXIT_BIND);
 121         }
 122         if (listen(s, queue_len) < 0) {
 123                 lprintf(1, "Can't listen: %s\n", strerror(errno));
 124                 exit(WC_EXIT_BIND);
 125         }
 126         return (s);
 127 }
 128
 129
 130
 131 /*
 132  * Create a Unix domain socket and listen on it
 133  * sockpath - file name of the unix domain socket
 134  * queue_len - Number of incoming connections to allow in the queue
 135  */
 136 int ig_uds_server(char *sockpath, int queue_len)
 137 {
 138         struct sockaddr_un addr;
 139         int s;
 140         int i;
 141         int actual_queue_len;
 142
 143         actual_queue_len = queue_len;
 144         if (actual_queue_len < 5) actual_queue_len = 5;
 145
 146         i = unlink(sockpath);
 147         if (i != 0) if (errno != ENOENT) {
 148                 lprintf(1, "webcit: can't unlink %s: %s\n",
 149                         sockpath, strerror(errno));
 150                 exit(WC_EXIT_BIND);
 151         }
 152
 153         memset(&addr, 0, sizeof(addr));
 154         addr.sun_family = AF_UNIX;
 155         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 156
 157         s = socket(AF_UNIX, SOCK_STREAM, 0);
 158         if (s < 0) {
 159                 lprintf(1, "webcit: Can't create a socket: %s\n",
 160                         strerror(errno));
 161                 exit(WC_EXIT_BIND);
 162         }
 163
 164         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 165                 lprintf(1, "webcit: Can't bind: %s\n",
 166                         strerror(errno));
 167                 exit(WC_EXIT_BIND);
 168         }
 169
 170         if (listen(s, actual_queue_len) < 0) {
 171                 lprintf(1, "webcit: Can't listen: %s\n",
 172                         strerror(errno));
 173                 exit(WC_EXIT_BIND);
 174         }
 175
 176         chmod(sockpath, 0777);
 177         return(s);
 178 }
 179
 180
 181
 182
 183 /*
 184  * Read data from the client socket.
 185  *
 186  * sock         socket fd to read from
 187  * buf          buffer to read into
 188  * bytes        number of bytes to read
 189  * timeout      Number of seconds to wait before timing out
 190  *
 191  * Possible return values:
 192  *      1       Requested number of bytes has been read.
 193  *      0       Request timed out.
 194  *      -1      Connection is broken, or other error.
 195  */
 196 int client_read_to(int *sock, char *buf, int bytes, int timeout)
 197 {
 198         int len, rlen;
 199         fd_set rfds;
 200         struct timeval tv;
 201         int retval;
 202
 203
 204 #ifdef HAVE_OPENSSL
 205         if (is_https) {
 206                 return (client_read_ssl(buf, bytes, timeout));
 207         }
 208 #endif
 209
 210         len = 0;
 211         while ((len < bytes) && (*sock > 0)) {
 212                 FD_ZERO(&rfds);
 213                 FD_SET(*sock, &rfds);
 214                 tv.tv_sec = timeout;
 215                 tv.tv_usec = 0;
 216
 217                 retval = select((*sock) + 1, &rfds, NULL, NULL, &tv);
 218                 if (FD_ISSET(*sock, &rfds) == 0) {
 219                         return (0);
 220                 }
 221
 222                 rlen = read(*sock, &buf[len], bytes - len);
 223
 224                 if (rlen < 1) {
 225                         lprintf(2, "client_read() failed: %s\n",
 226                                 strerror(errno));
 227                         if (*sock > 0)
 228                                 close(*sock);
 229                         *sock = -1;
 230                         return (-1);
 231                 }
 232                 len = len + rlen;
 233         }
 234
 235 #ifdef HTTP_TRACING
 236         write(2, "\033[32m", 5);
 237         write(2, buf, bytes);
 238         write(2, "\033[30m", 5);
 239 #endif
 240         return (1);
 241 }
 242
 243 /*
 244  * \brief Begin buffering HTTP output so we can transmit it all in one write operation later.
 245  */
 246 void begin_burst(void)
 247 {
 248         if (WC->WBuf == NULL)
 249                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 250 }
 251
 252
 253 /*
 254  * \brief Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
 255  */
 256 long end_burst(void)
 257 {
 258         struct wcsession *WCC = WC;
 259         const char *ptr, *eptr;
 260         long count;
 261         ssize_t res;
 262         fd_set wset;
 263         int fdflags;
 264
 265 #ifdef HAVE_ZLIB
 266         /* Perform gzip compression, if enabled and supported by client */
 267         if ((WCC->gzip_ok) && CompressBuffer(WCC->WBuf))
 268         {
 269                 hprintf("Content-encoding: gzip\r\n");
 270         }
 271 #endif  /* HAVE_ZLIB */
 272
 273         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
 274
 275         ptr = ChrPtr(WCC->HBuf);
 276         count = StrLength(WCC->HBuf);
 277         eptr = ptr + count;
 278
 279 #ifdef HAVE_OPENSSL
 280         if (is_https) {
 281                 client_write_ssl(WCC->HBuf);
 282                 client_write_ssl(WCC->WBuf);
 283                 return (count);
 284         }
 285 #endif
 286
 287
 288 #ifdef HTTP_TRACING
 289
 290         write(2, "\033[34m", 5);
 291         write(2, ptr, StrLength(WCC->WBuf));
 292         write(2, "\033[30m", 5);
 293 #endif
 294         fdflags = fcntl(WC->http_sock, F_GETFL);
 295
 296         while (ptr < eptr) {
 297                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 298                         FD_ZERO(&wset);
 299                         FD_SET(WCC->http_sock, &wset);
 300                         if (select(WCC->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 301                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 302                                 return -1;
 303                         }
 304                 }
 305
 306                 if ((res = write(WCC->http_sock,
 307                                  ptr,
 308                                  count)) == -1) {
 309                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 310                         return res;
 311                 }
 312                 count -= res;
 313                 ptr += res;
 314         }
 315
 316         ptr = ChrPtr(WCC->WBuf);
 317         count = StrLength(WCC->WBuf);
 318         eptr = ptr + count;
 319
 320 #ifdef HTTP_TRACING
 321
 322         write(2, "\033[34m", 5);
 323         write(2, ptr, StrLength(WCC->WBuf));
 324         write(2, "\033[30m", 5);
 325 #endif
 326
 327         while (ptr < eptr) {
 328                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 329                         FD_ZERO(&wset);
 330                         FD_SET(WCC->http_sock, &wset);
 331                         if (select(WCC->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 332                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 333                                 return -1;
 334                         }
 335                 }
 336
 337                 if ((res = write(WCC->http_sock,
 338                                  ptr,
 339                                  count)) == -1) {
 340                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 341                         return res;
 342                 }
 343                 count -= res;
 344                 ptr += res;
 345         }
 346
 347         return StrLength(WCC->WBuf);
 348 }
 349
 350
 351
 352 /*
 353  * \brief Read data from the client socket with default timeout.
 354  * (This is implemented in terms of client_read_to() and could be
 355  * justifiably moved out of sysdep.c)
 356  * \param sock the socket fd to read from
 357  * \param buf the buffer to write to
 358  * \param bytes Number of bytes to read
 359  */
 360 int client_read(int *sock, char *buf, int bytes)
 361 {
 362         return (client_read_to(sock, buf, bytes, SLEEPING));
 363 }
 364
 365
 366 /*
 367  * \brief Get a LF-terminated line of text from the client.
 368  * (This is implemented in terms of client_read() and could be
 369  * justifiably moved out of sysdep.c)
 370  * \param sock socket fd to get client line from
 371  * \param buf buffer to write read data to
 372  * \param bufsiz how many bytes to read
 373  * \return  number of bytes read???
 374  */
 375 int client_getln(int *sock, char *buf, int bufsiz)
 376 {
 377         int i, retval;
 378
 379         /* Read one character at a time.*/
 380         for (i = 0; *sock > 0; i++) {
 381                 retval = client_read(sock, &buf[i], 1);
 382                 if (retval < 0)
 383                         return retval;
 384                 if (retval != 1 || buf[i] == '\n' || i == (bufsiz-1))
 385                         break;
 386                 if ( (!isspace(buf[i])) && (!isprint(buf[i])) ) {
 387                         /* Non printable character recieved from client */
 388                         return(-1);
 389                 }
 390         }
 391
 392         /* If we got a long line, discard characters until the newline. */
 393         if (i == (bufsiz-1))
 394                 while (buf[i] != '\n' && retval == 1)
 395                         retval = client_read(sock, &buf[i], 1);
 396
 397         /*
 398          * Strip any trailing non-printable characters.
 399          */
 400         buf[i] = 0;
 401         while ((i > 0) && (!isprint(buf[i - 1]))) {
 402                 buf[--i] = 0;
 403         }
 404         return (retval);
 405 }
 406
 407 /*
 408  * \brief Shut us down the regular way.
 409  * \param signum the signal we want to forward
 410  */
 411 pid_t current_child;
 412 void graceful_shutdown_watcher(int signum) {
 413         lprintf (1, "bye; shutting down watcher.");
 414         kill(current_child, signum);
 415         if (signum != SIGHUP)
 416                 exit(0);
 417 }
 418
 419 /*
 420  * \brief shut us down the regular way.
 421  * \param signum the signal we want to forward
 422  */
 423 pid_t current_child;
 424 void graceful_shutdown(int signum) {
 425 //      kill(current_child, signum);
 426         char wd[SIZ];
 427         FILE *FD;
 428         int fd;
 429         getcwd(wd, SIZ);
 430         lprintf (1, "bye going down gracefull.[%d][%s]\n", signum, wd);
 431         fd = msock;
 432         msock = -1;
 433         time_to_die = 1;
 434         FD=fdopen(fd, "a+");
 435         fflush (FD);
 436         fclose (FD);
 437         close(fd);
 438 }
 439
 440
 441 /*
 442  * \brief       Start running as a daemon.
 443  *
 444  * param        do_close_stdio          Only close stdio if set.
 445  */
 446
 447 /*
 448  * Start running as a daemon.
 449  */
 450 void start_daemon(char *pid_file)
 451 {
 452         int status = 0;
 453         pid_t child = 0;
 454         FILE *fp;
 455         int do_restart = 0;
 456
 457         current_child = 0;
 458
 459         /* Close stdin/stdout/stderr and replace them with /dev/null.
 460          * We don't just call close() because we don't want these fd's
 461          * to be reused for other files.
 462          */
 463         chdir("/");
 464
 465         signal(SIGHUP, SIG_IGN);
 466         signal(SIGINT, SIG_IGN);
 467         signal(SIGQUIT, SIG_IGN);
 468
 469         child = fork();
 470         if (child != 0) {
 471                 exit(0);
 472         }
 473
 474         setsid();
 475         umask(0);
 476         freopen("/dev/null", "r", stdin);
 477         freopen("/dev/null", "w", stdout);
 478         freopen("/dev/null", "w", stderr);
 479         signal(SIGTERM, graceful_shutdown_watcher);
 480         signal(SIGHUP, graceful_shutdown_watcher);
 481
 482         do {
 483                 current_child = fork();
 484
 485
 486                 if (current_child < 0) {
 487                         perror("fork");
 488                         ShutDownLibCitadel ();
 489                         exit(errno);
 490                 }
 491
 492                 else if (current_child == 0) {  // child process
 493 //                      signal(SIGTERM, graceful_shutdown);
 494                         signal(SIGHUP, graceful_shutdown);
 495
 496                         return; /* continue starting webcit. */
 497                 }
 498
 499                 else { // watcher process
 500 //                      signal(SIGTERM, SIG_IGN);
 501 //                      signal(SIGHUP, SIG_IGN);
 502                         if (pid_file) {
 503                                 fp = fopen(pid_file, "w");
 504                                 if (fp != NULL) {
 505                                         fprintf(fp, "%d\n", getpid());
 506                                         fclose(fp);
 507                                 }
 508                         }
 509                         waitpid(current_child, &status, 0);
 510                 }
 511
 512                 do_restart = 0;
 513
 514                 /* Did the main process exit with an actual exit code? */
 515                 if (WIFEXITED(status)) {
 516
 517                         /* Exit code 0 means the watcher should exit */
 518                         if (WEXITSTATUS(status) == 0) {
 519                                 do_restart = 0;
 520                         }
 521
 522                         /* Exit code 101-109 means the watcher should exit */
 523                         else if ( (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109) ) {
 524                                 do_restart = 0;
 525                         }
 526
 527                         /* Any other exit code means we should restart. */
 528                         else {
 529                                 do_restart = 1;
 530                         }
 531                 }
 532
 533                 /* Any other type of termination (signals, etc.) should also restart. */
 534                 else {
 535                         do_restart = 1;
 536                 }
 537
 538         } while (do_restart);
 539
 540         if (pid_file) {
 541                 unlink(pid_file);
 542         }
 543         ShutDownLibCitadel ();
 544         exit(WEXITSTATUS(status));
 545 }
 546
 547 /*
 548  * \brief       Spawn an additional worker thread into the pool.
 549  */
 550 void spawn_another_worker_thread()
 551 {
 552         pthread_t SessThread;   /*< Thread descriptor */
 553         pthread_attr_t attr;    /*< Thread attributes */
 554         int ret;
 555
 556         lprintf(3, "Creating a new thread\n");
 557
 558         /* set attributes for the new thread */
 559         pthread_attr_init(&attr);
 560         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 561
 562         /*
 563          * Our per-thread stacks need to be bigger than the default size, otherwise
 564          * the MIME parser crashes on FreeBSD, and the IMAP service crashes on
 565          * 64-bit Linux.
 566          */
 567         if ((ret = pthread_attr_setstacksize(&attr, 1024 * 1024))) {
 568                 lprintf(1, "pthread_attr_setstacksize: %s\n",
 569                         strerror(ret));
 570                 pthread_attr_destroy(&attr);
 571         }
 572
 573         /* now create the thread */
 574         if (pthread_create(&SessThread, &attr,
 575                            (void *(*)(void *)) worker_entry, NULL)
 576             != 0) {
 577                 lprintf(1, "Can't create thread: %s\n", strerror(errno));
 578         }
 579
 580         /* free up the attributes */
 581         pthread_attr_destroy(&attr);
 582 }
 583
 584 //#define DBG_PRINNT_HOOKS_AT_START
 585 #ifdef DBG_PRINNT_HOOKS_AT_START
 586 const char foobuf[32];
 587 const char *nix(void *vptr) {snprintf(foobuf, 32, "%0x", (long) vptr); return foobuf;}
 588 #endif
 589 void InitTemplateCache(void);
 590
 591 extern void LoadZoneFiles(void);
 592 /*
 593  * \brief Here's where it all begins.
 594  * \param argc number of commandline args
 595  * \param argv the commandline arguments
 596  */
 597 int main(int argc, char **argv)
 598 {
 599         pthread_t SessThread;   /*< Thread descriptor */
 600         pthread_attr_t attr;    /*< Thread attributes */
 601         int a, i;                       /*< General-purpose variables */
 602         char tracefile[PATH_MAX];
 603         char ip_addr[256]="0.0.0.0";
 604         char dirbuffer[PATH_MAX]="";
 605         int relh=0;
 606         int home=0;
 607         int home_specified=0;
 608         char relhome[PATH_MAX]="";
 609         char webcitdir[PATH_MAX] = DATADIR;
 610         char *pidfile = NULL;
 611         char *hdir;
 612         const char *basedir;
 613 #ifdef ENABLE_NLS
 614         char *locale = NULL;
 615         char *mo = NULL;
 616 #endif /* ENABLE_NLS */
 617         char uds_listen_path[PATH_MAX]; /*< listen on a unix domain socket? */
 618
 619         HandlerHash = NewHash(1, NULL);
 620         PreferenceHooks = NewHash(1, NULL);
 621         WirelessTemplateCache = NewHash(1, NULL);
 622         WirelessLocalTemplateCache = NewHash(1, NULL);
 623         LocalTemplateCache = NewHash(1, NULL);
 624         TemplateCache = NewHash(1, NULL);
 625         GlobalNS = NewHash(1, NULL);
 626         Iterators = NewHash(1, NULL);
 627         Contitionals = NewHash(1, NULL);
 628         LoadZoneFiles();
 629
 630
 631 #ifdef DBG_PRINNT_HOOKS_AT_START
 632         dbg_PrintHash(HandlerHash, nix, NULL);
 633 #endif
 634
 635         /* Ensure that we are linked to the correct version of libcitadel */
 636         if (libcitadel_version_number() < LIBCITADEL_VERSION_NUMBER) {
 637                 fprintf(stderr, " You are running libcitadel version %d.%02d\n",
 638                         (libcitadel_version_number() / 100), (libcitadel_version_number() % 100));
 639                 fprintf(stderr, "WebCit was compiled against version %d.%02d\n",
 640                         (LIBCITADEL_VERSION_NUMBER / 100), (LIBCITADEL_VERSION_NUMBER % 100));
 641                 return(1);
 642         }
 643
 644         strcpy(uds_listen_path, "");
 645
 646         /* Parse command line */
 647 #ifdef HAVE_OPENSSL
 648         while ((a = getopt(argc, argv, "h:i:p:t:x:dD:cfs")) != EOF)
 649 #else
 650         while ((a = getopt(argc, argv, "h:i:p:t:x:dD:cf")) != EOF)
 651 #endif
 652                 switch (a) {
 653                 case 'h':
 654                         hdir = strdup(optarg);
 655                         relh=hdir[0]!='/';
 656                         if (!relh) safestrncpy(webcitdir, hdir,
 657                                                                    sizeof webcitdir);
 658                         else
 659                                 safestrncpy(relhome, relhome,
 660                                                         sizeof relhome);
 661                         /* free(hdir); TODO: SHOULD WE DO THIS? */
 662                         home_specified = 1;
 663                         home=1;
 664                         break;
 665                 case 'd':
 666                         running_as_daemon = 1;
 667                         break;
 668                 case 'D':
 669                         pidfile = strdup(optarg);
 670                         running_as_daemon = 1;
 671                         break;
 672                 case 'i':
 673                         safestrncpy(ip_addr, optarg, sizeof ip_addr);
 674                         break;
 675                 case 'p':
 676                         http_port = atoi(optarg);
 677                         if (http_port == 0) {
 678                                 safestrncpy(uds_listen_path, optarg, sizeof uds_listen_path);
 679                         }
 680                         break;
 681                 case 't':
 682                         safestrncpy(tracefile, optarg, sizeof tracefile);
 683                         freopen(tracefile, "w", stdout);
 684                         freopen(tracefile, "w", stderr);
 685                         freopen(tracefile, "r", stdin);
 686                         break;
 687                 case 'x':
 688                         verbosity = atoi(optarg);
 689                         break;
 690                 case 'f':
 691                         follow_xff = 1;
 692                         break;
 693                 case 'c':
 694                         server_cookie = malloc(256);
 695                         if (server_cookie != NULL) {
 696                                 safestrncpy(server_cookie,
 697                                        "Set-cookie: wcserver=",
 698                                         256);
 699                                 if (gethostname
 700                                     (&server_cookie[strlen(server_cookie)],
 701                                      200) != 0) {
 702                                         lprintf(2, "gethostname: %s\n",
 703                                                 strerror(errno));
 704                                         free(server_cookie);
 705                                 }
 706                         }
 707                         break;
 708                 case 's':
 709                         is_https = 1;
 710                         break;
 711                 default:
 712                         fprintf(stderr, "usage: webcit "
 713                                 "[-i ip_addr] [-p http_port] "
 714                                 "[-t tracefile] [-c] [-f] "
 715                                 "[-d] "
 716 #ifdef HAVE_OPENSSL
 717                                 "[-s] "
 718 #endif
 719                                 "[remotehost [remoteport]]\n");
 720                         return 1;
 721                 }
 722
 723         if (optind < argc) {
 724                 ctdlhost = argv[optind];
 725                 if (++optind < argc)
 726                         ctdlport = argv[optind];
 727         }
 728
 729         /* daemonize, if we were asked to */
 730         if (running_as_daemon) {
 731                 start_daemon(pidfile);
 732         }
 733         else {
 734 ///             signal(SIGTERM, graceful_shutdown);
 735                 signal(SIGHUP, graceful_shutdown);
 736         }
 737
 738         /* Tell 'em who's in da house */
 739         lprintf(1, PACKAGE_STRING "\n");
 740         lprintf(1, "Copyright (C) 1996-2008 by the Citadel development team.\n"
 741                 "This software is distributed under the terms of the "
 742                 "GNU General Public License.\n\n"
 743         );
 744
 745
 746         /* initialize the International Bright Young Thing */
 747 #ifdef ENABLE_NLS
 748         initialize_locales();
 749
 750         locale = setlocale(LC_ALL, "");
 751
 752         mo = malloc(strlen(webcitdir) + 20);
 753         lprintf(9, "Message catalog directory: %s\n", bindtextdomain("webcit", LOCALEDIR"/locale"));
 754         free(mo);
 755         lprintf(9, "Text domain: %s\n", textdomain("webcit"));
 756         lprintf(9, "Text domain Charset: %s\n", bind_textdomain_codeset("webcit","UTF8"));
 757         preset_locale();
 758 #endif
 759
 760
 761         /* calculate all our path on a central place */
 762     /* where to keep our config */
 763
 764 #define COMPUTE_DIRECTORY(SUBDIR) memcpy(dirbuffer,SUBDIR, sizeof dirbuffer);\
 765         snprintf(SUBDIR,sizeof SUBDIR,  "%s%s%s%s%s%s%s", \
 766                          (home&!relh)?webcitdir:basedir, \
 767              ((basedir!=webcitdir)&(home&!relh))?basedir:"/", \
 768              ((basedir!=webcitdir)&(home&!relh))?"/":"", \
 769                          relhome, \
 770              (relhome[0]!='\0')?"/":"",\
 771                          dirbuffer,\
 772                          (dirbuffer[0]!='\0')?"/":"");
 773         basedir=RUNDIR;
 774         COMPUTE_DIRECTORY(socket_dir);
 775         basedir=WWWDIR "/static";
 776         COMPUTE_DIRECTORY(static_dir);
 777         basedir=WWWDIR "/static/icons";
 778         COMPUTE_DIRECTORY(static_icon_dir);
 779         basedir=WWWDIR "/static.local";
 780         COMPUTE_DIRECTORY(static_local_dir);
 781
 782         snprintf(file_crpt_file_key,
 783                  sizeof file_crpt_file_key,
 784                  "%s/citadel.key",
 785                  ctdl_key_dir);
 786         snprintf(file_crpt_file_csr,
 787                  sizeof file_crpt_file_csr,
 788                  "%s/citadel.csr",
 789                  ctdl_key_dir);
 790         snprintf(file_crpt_file_cer,
 791                  sizeof file_crpt_file_cer,
 792                  "%s/citadel.cer",
 793                  ctdl_key_dir);
 794
 795         /* we should go somewhere we can leave our coredump, if enabled... */
 796         lprintf(9, "Changing directory to %s\n", socket_dir);
 797         if (chdir(webcitdir) != 0) {
 798                 perror("chdir");
 799         }
 800         LoadIconDir(static_icon_dir);
 801         InitTemplateCache();
 802
 803         initialise_modules();
 804         initialize_viewdefs();
 805         initialize_axdefs();
 806
 807         /*
 808          * Set up a place to put thread-specific data.
 809          * We only need a single pointer per thread - it points to the
 810          * wcsession struct to which the thread is currently bound.
 811          */
 812         if (pthread_key_create(&MyConKey, NULL) != 0) {
 813                 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
 814         }
 815         InitialiseSemaphores ();
 816
 817         /*
 818          * Set up a place to put thread-specific SSL data.
 819          * We don't stick this in the wcsession struct because SSL starts
 820          * up before the session is bound, and it gets torn down between
 821          * transactions.
 822          */
 823 #ifdef HAVE_OPENSSL
 824         if (pthread_key_create(&ThreadSSL, NULL) != 0) {
 825                 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
 826         }
 827 #endif
 828
 829         /*
 830          * Bind the server to our favorite port.
 831          * There is no need to check for errors, because ig_tcp_server()
 832          * exits if it doesn't succeed.
 833          */
 834
 835         if (!IsEmptyStr(uds_listen_path)) {
 836                 lprintf(2, "Attempting to create listener socket at %s...\n", uds_listen_path);
 837                 msock = ig_uds_server(uds_listen_path, LISTEN_QUEUE_LENGTH);
 838         }
 839         else {
 840                 lprintf(2, "Attempting to bind to port %d...\n", http_port);
 841                 msock = ig_tcp_server(ip_addr, http_port, LISTEN_QUEUE_LENGTH);
 842         }
 843
 844         lprintf(2, "Listening on socket %d\n", msock);
 845         signal(SIGPIPE, SIG_IGN);
 846
 847         pthread_mutex_init(&SessionListMutex, NULL);
 848
 849         /*
 850          * Start up the housekeeping thread
 851          */
 852         pthread_attr_init(&attr);
 853         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 854         pthread_create(&SessThread, &attr,
 855                        (void *(*)(void *)) housekeeping_loop, NULL);
 856
 857
 858         /*
 859          * If this is an HTTPS server, fire up SSL
 860          */
 861 #ifdef HAVE_OPENSSL
 862         if (is_https) {
 863                 init_ssl();
 864         }
 865 #endif
 866
 867         /* Start a few initial worker threads */
 868         for (i = 0; i < (MIN_WORKER_THREADS); ++i) {
 869                 spawn_another_worker_thread();
 870         }
 871
 872         /* now the original thread becomes another worker */
 873         worker_entry();
 874         ShutDownLibCitadel ();
 875         DeleteHash(&HandlerHash);
 876         DeleteHash(&PreferenceHooks);
 877         return 0;
 878 }
 879
 880
 881 void ShutDownWebcit(void)
 882 {
 883         DeleteHash(&ZoneHash);
 884         free_zone_directory ();
 885         icaltimezone_release_zone_tab ();
 886         icalmemory_free_ring ();
 887         ShutDownLibCitadel ();
 888         DeleteHash(&HandlerHash);
 889         DeleteHash(&PreferenceHooks);
 890         DeleteHash(&GlobalNS);
 891         DeleteHash(&WirelessTemplateCache);
 892         DeleteHash(&WirelessLocalTemplateCache);
 893         DeleteHash(&TemplateCache);
 894         DeleteHash(&LocalTemplateCache);
 895         DeleteHash(&Iterators);
 896         DeleteHash(&Contitionals);
 897 #ifdef ENABLE_NLS
 898         ShutdownLocale();
 899 #endif
 900 }
 901
 902 /*
 903  * Entry point for worker threads
 904  */
 905 void worker_entry(void)
 906 {
 907         int ssock;
 908         int i = 0;
 909         int fail_this_transaction = 0;
 910         int ret;
 911         struct timeval tv;
 912         fd_set readset, tempset;
 913
 914         tv.tv_sec = 0;
 915         tv.tv_usec = 10000;
 916         FD_ZERO(&readset);
 917         FD_SET(msock, &readset);
 918
 919         do {
 920                 /* Only one thread can accept at a time */
 921                 fail_this_transaction = 0;
 922                 ssock = -1;
 923                 errno = EAGAIN;
 924                 do {
 925                         ret = -1; /* just one at once should select... */
 926                         begin_critical_section(S_SELECT);
 927
 928                         FD_ZERO(&tempset);
 929                         if (msock > 0) FD_SET(msock, &tempset);
 930                         tv.tv_sec = 0;
 931                         tv.tv_usec = 10000;
 932                         if (msock > 0)  ret = select(msock+1, &tempset, NULL, NULL,  &tv);
 933                         end_critical_section(S_SELECT);
 934                         if ((ret < 0) && (errno != EINTR) && (errno != EAGAIN))
 935                         {// EINTR and EAGAIN are thrown but not of interest.
 936                                 lprintf(2, "accept() failed:%d %s\n",
 937                                         errno, strerror(errno));
 938                         }
 939                         else if ((ret > 0) && (msock > 0) && FD_ISSET(msock, &tempset))
 940                         {// Successfully selected, and still not shutting down? Accept!
 941                                 ssock = accept(msock, NULL, 0);
 942                         }
 943
 944                 } while ((msock > 0) && (ssock < 0)  && (time_to_die == 0));
 945
 946                 if ((msock == -1)||(time_to_die))
 947                 {// ok, we're going down.
 948                         int shutdown = 0;
 949
 950                         /* the first to come here will have to do the cleanup.
 951                          * make shure its realy just one.
 952                          */
 953                         begin_critical_section(S_SHUTDOWN);
 954                         if (msock == -1)
 955                         {
 956                                 msock = -2;
 957                                 shutdown = 1;
 958                         }
 959                         end_critical_section(S_SHUTDOWN);
 960                         if (shutdown == 1)
 961                         {// we're the one to cleanup the mess.
 962                                 lprintf(2, "I'm master shutdown: tagging sessions to be killed.\n");
 963                                 shutdown_sessions();
 964                                 lprintf(2, "master shutdown: waiting for others\n");
 965                                 sleeeeeeeeeep(1); // wait so some others might finish...
 966                                 lprintf(2, "master shutdown: cleaning up sessions\n");
 967                                 do_housekeeping();
 968                                 lprintf(2, "master shutdown: cleaning up libical\n");
 969
 970                                 ShutDownWebcit();
 971
 972                                 lprintf(2, "master shutdown exiting!.\n");
 973                                 exit(0);
 974                         }
 975                         break;
 976                 }
 977                 if (ssock < 0 ) continue;
 978
 979                 if (msock < 0) {
 980                         if (ssock > 0) close (ssock);
 981                         lprintf(2, "inbetween.");
 982                         pthread_exit(NULL);
 983                 } else { // Got it? do some real work!
 984                         /* Set the SO_REUSEADDR socket option */
 985                         i = 1;
 986                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR,
 987                                    &i, sizeof(i));
 988
 989                         /* If we are an HTTPS server, go crypto now. */
 990 #ifdef HAVE_OPENSSL
 991                         if (is_https) {
 992                                 if (starttls(ssock) != 0) {
 993                                         fail_this_transaction = 1;
 994                                         close(ssock);
 995                                 }
 996                         }
 997 #endif
 998
 999                         if (fail_this_transaction == 0) {
1000
1001                                 /* Perform an HTTP transaction... */
1002                                 context_loop(&ssock);
1003
1004                                 /* Shut down SSL/TLS if required... */
1005 #ifdef HAVE_OPENSSL
1006                                 if (is_https) {
1007                                         endtls();
1008                                 }
1009 #endif
1010
1011                                 /* ...and close the socket. */
1012                                 if (ssock > 0)
1013                                         lingering_close(ssock);
1014                         }
1015
1016                 }
1017
1018         } while (!time_to_die);
1019
1020         lprintf (1, "bye\n");
1021         pthread_exit(NULL);
1022 }
1023
1024 /*
1025  * \brief print log messages
1026  * logs to stderr if loglevel is lower than the verbosity set at startup
1027  * \param loglevel level of the message
1028  * \param format the printf like format string
1029  * \param ... the strings to put into format
1030  */
1031 int lprintf(int loglevel, const char *format, ...)
1032 {
1033         va_list ap;
1034
1035         if (loglevel <= verbosity) {
1036                 va_start(ap, format);
1037                 vfprintf(stderr, format, ap);
1038                 va_end(ap);
1039                 fflush(stderr);
1040         }
1041         return 1;
1042 }
1043
1044
1045 /*
1046  * \brief print the actual stack frame.
1047  */
1048 void wc_backtrace(void)
1049 {
1050 #ifdef HAVE_BACKTRACE
1051         void *stack_frames[50];
1052         size_t size, i;
1053         char **strings;
1054
1055
1056         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
1057         strings = backtrace_symbols(stack_frames, size);
1058         for (i = 0; i < size; i++) {
1059                 if (strings != NULL)
1060                         lprintf(1, "%s\n", strings[i]);
1061                 else
1062                         lprintf(1, "%p\n", stack_frames[i]);
1063         }
1064         free(strings);
1065 #endif
1066 }
1067
1068 /*@}*/