webcit/webserver.c

   1 /*
   2  * This contains a simple multithreaded TCP server manager.  It sits around
   3  * waiting on the specified port for incoming HTTP connections.  When a
   4  * connection is established, it calls context_loop() from context_loop.c.
   5  *
   6  * Copyright (c) 1996-2011 by the citadel.org developers.
   7  * This program is released under the terms of the GNU General Public License v3.
   8  *
   9  */
  10
  11 #include "webcit.h"
  12 #include "webserver.h"
  13
  14 #include "modules_init.h"
  15 #ifndef HAVE_SNPRINTF
  16 int vsnprintf(char *buf, size_t max, const char *fmt, va_list argp);
  17 #endif
  18
  19
  20 extern int msock;                       /* master listening socket */
  21 extern int verbosity;           /* Logging level */
  22 extern char static_icon_dir[PATH_MAX];          /* where should we find our mime icons */
  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 DisableGzip = 0;
  27 struct redirector *redir = NULL;
  28 char *default_landing_page = NULL;
  29 int num_redir = 0;
  30 extern pthread_mutex_t SessionListMutex;
  31 extern pthread_key_t MyConKey;
  32
  33 extern void *housekeeping_loop(void);
  34 extern int webcit_tcp_server(char *ip_addr, int port_number, int queue_len);
  35 extern int webcit_uds_server(char *sockpath, int queue_len);
  36 extern void graceful_shutdown_watcher(int signum);
  37 extern void graceful_shutdown(int signum);
  38 extern void start_daemon(char *pid_file);
  39 extern void webcit_calc_dirs_n_files(int relh, const char *basedir, int home, char *webcitdir, char *relhome);
  40
  41 extern void drop_root(uid_t UID);
  42
  43 char socket_dir[PATH_MAX];                      /* where to talk to our citadel server */
  44
  45 char *server_cookie = NULL;     /* our Cookie connection to the client */
  46 int http_port = PORT_NUM;       /* Port to listen on */
  47 char *ctdlhost = DEFAULT_HOST;  /* our name */
  48 char *ctdlport = DEFAULT_PORT;  /* our Port */
  49 int setup_wizard = 0;           /* should we run the setup wizard? \todo */
  50 char wizard_filename[PATH_MAX]; /* where's the setup wizard? */
  51 int running_as_daemon = 0;      /* should we deamonize on startup? */
  52
  53
  54
  55 /* #define DBG_PRINNT_HOOKS_AT_START */
  56 #ifdef DBG_PRINNT_HOOKS_AT_START
  57 extern HashList *HandlerHash;
  58 const char foobuf[32];
  59 const char *nix(void *vptr) {snprintf(foobuf, 32, "%0x", (long) vptr); return foobuf;}
  60 #endif
  61 extern int dbg_analyze_msg;
  62 extern int dbg_backtrace_template_errors;
  63 extern int DumpTemplateI18NStrings;
  64 extern StrBuf *I18nDump;
  65 void InitTemplateCache(void);
  66 extern int LoadTemplates;
  67
  68
  69
  70
  71
  72 /*
  73  * Handle redirects to legacy web servers
  74  */
  75 void handle_redir(void) {
  76         if (num_redir > 0) {
  77                 int i;
  78                 const char *req = ChrPtr(WC->Hdr->this_page);
  79                 if (!req) {
  80                         do_404();
  81                         return;
  82                 }
  83                 if (req[0] == '/') ++req;
  84                 syslog(9, "handle_redir() called; redirect this: %s", req);
  85                 for (i=0; i<num_redir; ++i) {
  86                         if (!strncmp(redir[i].urlpart, req, strlen(redir[i].urlpart))) {
  87                                 char go_here[1024];
  88                                 snprintf(go_here, sizeof go_here, redir[i].redirect_to, req);
  89                                 syslog(9, "redirecting to: %s", go_here);
  90                                 http_redirect(go_here);
  91                                 return;
  92                         }
  93                 }
  94         }
  95         do_404();
  96 }
  97
  98
  99
 100 /*
 101  * load redirect strings (for supporting transition of legacy web servers to citadel on the same host)
 102  */
 103 void load_redirs(char *filename) {
 104         char buf[1024];
 105         int num_redir_alloc = num_redir;
 106         FILE *fp = fopen(filename, "r");
 107         if (!fp) {
 108                 syslog(1, "Cannot open %s: %s", filename, strerror(errno));
 109                 return;
 110         }
 111
 112         while (fgets(buf, sizeof buf, fp) != NULL) {
 113                 char *ch;
 114
 115                 buf[strlen(buf)-1] = 0;
 116
 117                 ch = strchr(buf, '#');
 118                 if (ch) strcpy(ch, "");
 119                 striplt(buf);
 120                 if (!IsEmptyStr(buf)) {
 121
 122                         if (num_redir >= num_redir_alloc) {
 123                                 if (num_redir_alloc == 0) {
 124                                         num_redir_alloc = 10;
 125                                 }
 126                                 else {
 127                                         num_redir_alloc = num_redir_alloc * 2;
 128                                 }
 129                                 redir = realloc(redir, sizeof(struct redirector) * num_redir_alloc );
 130                         }
 131
 132                         extract_token(redir[num_redir].urlpart, buf, 0, '|', sizeof(redir[num_redir].urlpart));
 133                         extract_token(redir[num_redir].redirect_to, buf, 1, '|', sizeof(redir[num_redir].redirect_to));
 134                         WebcitAddUrlHandler(redir[num_redir].urlpart, strlen(redir[num_redir].urlpart), "", 0, handle_redir, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 135                         if (!strcasecmp(redir[num_redir].urlpart, "home")) {
 136                                 default_landing_page = redir[num_redir].redirect_to ;
 137                         }
 138                         ++num_redir;
 139                 }
 140
 141         }
 142         fclose(fp);
 143 }
 144
 145
 146
 147 /*
 148  * Here's where it all begins.
 149  */
 150 int main(int argc, char **argv)
 151 {
 152         uid_t UID = -1;
 153         size_t basesize = 2;            /* how big should strbufs be on creation? */
 154         pthread_t SessThread;           /* Thread descriptor */
 155         pthread_attr_t attr;            /* Thread attributes */
 156         int a;                          /* General-purpose variable */
 157         char tracefile[PATH_MAX];
 158         char ip_addr[256]="*";
 159         int relh=0;
 160         int home=0;
 161         int home_specified=0;
 162         char relhome[PATH_MAX]="";
 163         char webcitdir[PATH_MAX] = DATADIR;
 164         char *pidfile = NULL;
 165         char *hdir;
 166         const char *basedir = NULL;
 167         char uds_listen_path[PATH_MAX]; /* listen on a unix domain socket? */
 168         const char *I18nDumpFile = NULL;
 169         FILE *rvfp = NULL;
 170         int rv = 0;
 171
 172         WildFireInitBacktrace(argv[0], 2);
 173
 174         start_modules ();
 175
 176 #ifdef DBG_PRINNT_HOOKS_AT_START
 177 /*      dbg_PrintHash(HandlerHash, nix, NULL);*/
 178 #endif
 179
 180         /* Ensure that we are linked to the correct version of libcitadel */
 181         if (libcitadel_version_number() < LIBCITADEL_VERSION_NUMBER) {
 182                 fprintf(stderr, " You are running libcitadel version %d.%02d\n",
 183                         (libcitadel_version_number() / 100), (libcitadel_version_number() % 100));
 184                 fprintf(stderr, "WebCit was compiled against version %d.%02d\n",
 185                         (LIBCITADEL_VERSION_NUMBER / 100), (LIBCITADEL_VERSION_NUMBER % 100));
 186                 return(1);
 187         }
 188
 189         strcpy(uds_listen_path, "");
 190
 191         /* Parse command line */
 192 #ifdef HAVE_OPENSSL
 193         while ((a = getopt(argc, argv, "u:h:i:p:t:T:B:x:dD:G:r:cfsS:Z")) != EOF)
 194 #else
 195         while ((a = getopt(argc, argv, "u:h:i:p:t:T:B:x:dD:G:r:cfZ")) != EOF)
 196 #endif
 197                 switch (a) {
 198                 case 'u':
 199                         UID = atol(optarg);
 200                         break;
 201                 case 'r':
 202                         load_redirs(optarg);
 203                         break;
 204                 case 'h':
 205                         hdir = strdup(optarg);
 206                         relh=hdir[0]!='/';
 207                         if (!relh) {
 208                                 safestrncpy(webcitdir, hdir, sizeof webcitdir);
 209                         }
 210                         else {
 211                                 safestrncpy(relhome, relhome, sizeof relhome);
 212                         }
 213                         /* free(hdir); TODO: SHOULD WE DO THIS? */
 214                         home_specified = 1;
 215                         home=1;
 216                         break;
 217                 case 'd':
 218                         running_as_daemon = 1;
 219                         break;
 220                 case 'D':
 221                         pidfile = strdup(optarg);
 222                         running_as_daemon = 1;
 223                         break;
 224                 case 'B': /* Basesize */
 225                         basesize = atoi(optarg);
 226                         if (basesize > 2)
 227                                 StartLibCitadel(basesize);
 228                         break;
 229                 case 'i':
 230                         safestrncpy(ip_addr, optarg, sizeof ip_addr);
 231                         break;
 232                 case 'p':
 233                         http_port = atoi(optarg);
 234                         if (http_port == 0) {
 235                                 safestrncpy(uds_listen_path, optarg, sizeof uds_listen_path);
 236                         }
 237                         break;
 238                 case 't':
 239                         safestrncpy(tracefile, optarg, sizeof tracefile);
 240                         rvfp = freopen(tracefile, "w", stdout);
 241                         rvfp = freopen(tracefile, "w", stderr);
 242                         rvfp = freopen(tracefile, "r", stdin);
 243                         break;
 244                 case 'T':
 245                         LoadTemplates = atoi(optarg);
 246                         dbg_analyze_msg = (LoadTemplates && (1<<1)) != 0;
 247                         dbg_backtrace_template_errors = (LoadTemplates && (1<<2)) != 0;
 248                         break;
 249                 case 'Z':
 250                         DisableGzip = 1;
 251                         break;
 252                 case 'x':
 253                         verbosity = atoi(optarg);
 254                         break;
 255                 case 'f':
 256                         follow_xff = 1;
 257                         break;
 258                 case 'c':
 259                         server_cookie = malloc(256);
 260                         if (server_cookie != NULL) {
 261                                 safestrncpy(server_cookie,
 262                                        "Set-cookie: wcserver=",
 263                                         256);
 264                                 if (gethostname
 265                                     (&server_cookie[strlen(server_cookie)],
 266                                      200) != 0) {
 267                                         syslog(2, "gethostname: %s", strerror(errno));
 268                                         free(server_cookie);
 269                                 }
 270                         }
 271                         break;
 272 #ifdef HAVE_OPENSSL
 273                 case 's':
 274                         is_https = 1;
 275                         break;
 276                 case 'S':
 277                         is_https = 1;
 278                         ssl_cipher_list = strdup(optarg);
 279                         break;
 280 #endif
 281                 case 'G':
 282                         DumpTemplateI18NStrings = 1;
 283                         I18nDump = NewStrBufPlain(HKEY("int templatestrings(void)\n{\n"));
 284                         I18nDumpFile = optarg;
 285                         break;
 286                 default:
 287                         fprintf(stderr, "usage: webcit "
 288                                 "[-i ip_addr] [-p http_port] "
 289                                 "[-t tracefile] [-c] [-f] "
 290                                 "[-T Templatedebuglevel] "
 291                                 "[-d] [-Z] [-G i18ndumpfile] "
 292 #ifdef HAVE_OPENSSL
 293                                 "[-s] [-S cipher_suites]"
 294 #endif
 295                                 "[remotehost [remoteport]]\n");
 296                         return 1;
 297                 }
 298
 299         /* Start the logger */
 300         openlog("webcit",
 301                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 302                 LOG_DAEMON
 303         );
 304
 305         if (optind < argc) {
 306                 ctdlhost = argv[optind];
 307                 if (++optind < argc)
 308                         ctdlport = argv[optind];
 309         }
 310
 311         /* daemonize, if we were asked to */
 312         if (!DumpTemplateI18NStrings && running_as_daemon) {
 313                 start_daemon(pidfile);
 314         }
 315         else {
 316                 signal(SIGINT, graceful_shutdown);
 317                 signal(SIGHUP, graceful_shutdown);
 318         }
 319
 320         webcit_calc_dirs_n_files(relh, basedir, home, webcitdir, relhome);
 321         LoadIconDir(static_icon_dir);
 322
 323         /* Tell 'em who's in da house */
 324         syslog(1, "%s", PACKAGE_STRING);
 325         syslog(1, "Copyright (C) 1996-2011 by the citadel.org team");
 326         syslog(1, " ");
 327         syslog(1, "This program is open source software: you can redistribute it and/or");
 328         syslog(1, "modify it under the terms of the GNU General Public License as published");
 329         syslog(1, "by the Free Software Foundation, either version 3 of the License, or");
 330         syslog(1, "(at your option) any later version.");
 331         syslog(1, " ");
 332         syslog(1, "This program is distributed in the hope that it will be useful,");
 333         syslog(1, "but WITHOUT ANY WARRANTY; without even the implied warranty of");
 334         syslog(1, "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the");
 335         syslog(1, "GNU General Public License for more details.");
 336         syslog(1, " ");
 337         syslog(1, "You should have received a copy of the GNU General Public License");
 338         syslog(1, "along with this program.  If not, see <http://www.gnu.org/licenses/>.");
 339         syslog(1, " ");
 340
 341
 342         /* initialize various subsystems */
 343
 344         initialise_modules();
 345         InitTemplateCache();
 346         if (DumpTemplateI18NStrings) {
 347                 FILE *fd;
 348                 StrBufAppendBufPlain(I18nDump, HKEY("}\n"), 0);
 349                 if (StrLength(I18nDump) < 50) {
 350                         syslog(1, "********************************************************************************\n");
 351                         syslog(1, "*        No strings found in templates!  Are you sure they're there?           *\n");
 352                         syslog(1, "********************************************************************************\n");
 353                         return -1;
 354                 }
 355                 fd = fopen(I18nDumpFile, "w");
 356                 if (fd == NULL) {
 357                         syslog(1, "********************************************************************************\n");
 358                         syslog(1, "*                  unable to open I18N dumpfile [%s]         *\n", I18nDumpFile);
 359                         syslog(1, "********************************************************************************\n");
 360                         return -1;
 361                 }
 362                 rv = fwrite(ChrPtr(I18nDump), 1, StrLength(I18nDump), fd);
 363                 fclose(fd);
 364                 return 0;
 365         }
 366
 367
 368         /* Tell libical to return an error instead of aborting if it sees badly formed iCalendar data. */
 369         icalerror_errors_are_fatal = 0;
 370
 371         /* Use our own prefix on tzid's generated from system tzdata */
 372         icaltimezone_set_tzid_prefix("/citadel.org/");
 373
 374         /*
 375          * Set up a place to put thread-specific data.
 376          * We only need a single pointer per thread - it points to the
 377          * wcsession struct to which the thread is currently bound.
 378          */
 379         if (pthread_key_create(&MyConKey, NULL) != 0) {
 380                 syslog(1, "Can't create TSD key: %s\n", strerror(errno));
 381         }
 382         InitialiseSemaphores ();
 383
 384         /*
 385          * Set up a place to put thread-specific SSL data.
 386          * We don't stick this in the wcsession struct because SSL starts
 387          * up before the session is bound, and it gets torn down between
 388          * transactions.
 389          */
 390 #ifdef HAVE_OPENSSL
 391         if (pthread_key_create(&ThreadSSL, NULL) != 0) {
 392                 syslog(1, "Can't create TSD key: %s\n", strerror(errno));
 393         }
 394 #endif
 395
 396         /*
 397          * Bind the server to our favorite port.
 398          * There is no need to check for errors, because webcit_tcp_server()
 399          * exits if it doesn't succeed.
 400          */
 401
 402         if (!IsEmptyStr(uds_listen_path)) {
 403                 syslog(2, "Attempting to create listener socket at %s...\n", uds_listen_path);
 404                 msock = webcit_uds_server(uds_listen_path, LISTEN_QUEUE_LENGTH);
 405         }
 406         else {
 407                 syslog(2, "Attempting to bind to port %d...\n", http_port);
 408                 msock = webcit_tcp_server(ip_addr, http_port, LISTEN_QUEUE_LENGTH);
 409         }
 410         if (msock < 0)
 411         {
 412                 ShutDownWebcit();
 413                 return -msock;
 414         }
 415
 416         syslog(2, "Listening on socket %d\n", msock);
 417         signal(SIGPIPE, SIG_IGN);
 418
 419         pthread_mutex_init(&SessionListMutex, NULL);
 420
 421         /*
 422          * Start up the housekeeping thread
 423          */
 424         pthread_attr_init(&attr);
 425         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 426         pthread_create(&SessThread, &attr,
 427                        (void *(*)(void *)) housekeeping_loop, NULL);
 428
 429
 430         /*
 431          * If this is an HTTPS server, fire up SSL
 432          */
 433 #ifdef HAVE_OPENSSL
 434         if (is_https) {
 435                 init_ssl();
 436         }
 437 #endif
 438         drop_root(UID);
 439
 440         /* Become a worker thread.  More worker threads will be spawned as they are needed. */
 441         worker_entry();
 442         ShutDownLibCitadel ();
 443         return 0;
 444 }
 445
 446
 447
 448
 449
 450
 451