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