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