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