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