citadel/server_main.c

   1 /*
   2  * citserver's main() function lives here.
   3  *
   4  * $Id$
   5  */
   6
   7 #include "sysdep.h"
   8 #include <stdlib.h>
   9 #include <unistd.h>
  10 #include <stdio.h>
  11 #include <fcntl.h>
  12 #include <ctype.h>
  13 #include <signal.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16 #include <sys/wait.h>
  17 #include <sys/socket.h>
  18 #include <syslog.h>
  19
  20 #if TIME_WITH_SYS_TIME
  21 # include <sys/time.h>
  22 # include <time.h>
  23 #else
  24 # if HAVE_SYS_TIME_H
  25 #  include <sys/time.h>
  26 # else
  27 #  include <time.h>
  28 # endif
  29 #endif
  30
  31 #include <limits.h>
  32 #include <netinet/in.h>
  33 #include <netdb.h>
  34 #include <sys/un.h>
  35 #include <string.h>
  36 #include <pwd.h>
  37 #include <errno.h>
  38 #include <stdarg.h>
  39 #include <grp.h>
  40 #ifdef HAVE_PTHREAD_H
  41 #include <pthread.h>
  42 #endif
  43 #ifdef HAVE_SYS_PRCTL_H
  44 #include <sys/prctl.h>
  45 #endif
  46 #include "citadel.h"
  47 #include "server.h"
  48 #include "serv_extensions.h"
  49 #include "sysdep_decls.h"
  50 #include "citserver.h"
  51 #include "support.h"
  52 #include "config.h"
  53 #include "database.h"
  54 #include "housekeeping.h"
  55 #include "tools.h"
  56
  57 #ifdef HAVE_SYS_SELECT_H
  58 #include <sys/select.h>
  59 #endif
  60
  61 #ifndef HAVE_SNPRINTF
  62 #include "snprintf.h"
  63 #endif
  64
  65 int running_as_daemon = 0;
  66
  67 /*
  68  * Here's where it all begins.
  69  */
  70 int main(int argc, char **argv)
  71 {
  72         char facility[32];
  73         int a, i;                       /* General-purpose variables */
  74         struct passwd *pw;
  75         int drop_root_perms = 1;
  76         size_t size;
  77
  78         /* initialize the master context */
  79         InitializeMasterCC();
  80
  81         /* set default syslog facility */
  82         syslog_facility = LOG_DAEMON;
  83
  84         /* parse command-line arguments */
  85         for (a=1; a<argc; ++a) {
  86
  87                 if (!strncmp(argv[a], "-l", 2)) {
  88                         safestrncpy(facility, argv[a], sizeof(facility));
  89                         syslog_facility = SyslogFacility(facility);
  90                 }
  91
  92                 /* run in the background if -d was specified */
  93                 else if (!strcmp(argv[a], "-d")) {
  94                         running_as_daemon = 1;
  95                 }
  96
  97                 /* -x specifies the desired logging level */
  98                 else if (!strncmp(argv[a], "-x", 2)) {
  99                         verbosity = atoi(&argv[a][2]);
 100                 }
 101
 102                 else if (!strncmp(argv[a], "-h", 2)) {
 103                         safestrncpy(bbs_home_directory, &argv[a][2],
 104                                     sizeof bbs_home_directory);
 105                         home_specified = 1;
 106                 }
 107
 108                 else if (!strncmp(argv[a], "-t", 2)) {
 109                         freopen(&argv[a][2], "w", stderr);
 110                 }
 111
 112                 else if (!strncmp(argv[a], "-f", 2)) {
 113                         do_defrag = 1;
 114                 }
 115
 116                 /* -r tells the server not to drop root permissions. don't use
 117                  * this unless you know what you're doing. this should be
 118                  * removed in the next release if it proves unnecessary. */
 119                 else if (!strcmp(argv[a], "-r"))
 120                         drop_root_perms = 0;
 121
 122                 /* any other parameter makes it crash and burn */
 123                 else {
 124                         lprintf(CTDL_EMERG,     "citserver: usage: "
 125                                         "citserver "
 126                                         "[-lLogFacility] "
 127                                         "[-d] [-f]"
 128                                         " [-tTraceFile]"
 129                                         " [-xLogLevel] [-hHomeDir]\n");
 130                         exit(1);
 131                 }
 132
 133         }
 134
 135         /* daemonize, if we were asked to */
 136         if (running_as_daemon) { start_daemon(0); drop_root_perms = 1; }
 137
 138         /* initialize the syslog facility */
 139         if (running_as_daemon) openlog("Citadel", LOG_NDELAY, syslog_facility);
 140         else openlog("Citadel", LOG_PERROR|LOG_NDELAY, syslog_facility);
 141         setlogmask(LOG_UPTO(verbosity));
 142
 143         /* Tell 'em who's in da house */
 144         lprintf(CTDL_NOTICE, "\n");
 145         lprintf(CTDL_NOTICE, "\n");
 146         lprintf(CTDL_NOTICE,
 147                 "*** Citadel server engine v%d.%02d ***\n",
 148                 (REV_LEVEL/100), (REV_LEVEL%100));
 149         lprintf(CTDL_NOTICE,
 150                 "Copyright (C) 1987-2005 by the Citadel development team.\n");
 151         lprintf(CTDL_NOTICE,
 152                 "This program is distributed under the terms of the GNU "
 153                 "General Public License.\n");
 154         lprintf(CTDL_NOTICE, "\n");
 155         lprintf(CTDL_DEBUG, "Called as: %s\n", argv[0]);
 156
 157         /* Load site-specific parameters, and set the ipgm secret */
 158         lprintf(CTDL_INFO, "Loading citadel.config\n");
 159         get_config();
 160         config.c_ipgm_secret = rand();
 161         put_config();
 162
 163         /* Initialize... */
 164         init_sysdep();
 165
 166         /*
 167          * Do non system dependent startup functions.
 168          */
 169         master_startup();
 170
 171         /*
 172          * Bind the server to a Unix-domain socket.
 173          */
 174         CtdlRegisterServiceHook(0,
 175                                 "citadel.socket",
 176                                 citproto_begin_session,
 177                                 do_command_loop,
 178                                 do_async_loop);
 179
 180         /*
 181          * Bind the server to our favorite TCP port (usually 504).
 182          */
 183         CtdlRegisterServiceHook(config.c_port_number,
 184                                 NULL,
 185                                 citproto_begin_session,
 186                                 do_command_loop,
 187                                 do_async_loop);
 188
 189         /*
 190          * Load any server-side extensions available here.
 191          */
 192         lprintf(CTDL_INFO, "Initializing server extensions\n");
 193         size = strlen(bbs_home_directory) + 9;
 194         initialize_server_extensions();
 195
 196         /*
 197          * Now that we've bound the sockets, change to the BBS user id and its
 198          * corresponding group ids
 199          */
 200         if (drop_root_perms) {
 201                 if ((pw = getpwuid(BBSUID)) == NULL)
 202                         lprintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 203                                    "Group IDs will be incorrect.\n", (long)BBSUID,
 204                                 strerror(errno));
 205                 else {
 206                         initgroups(pw->pw_name, pw->pw_gid);
 207                         if (setgid(pw->pw_gid))
 208                                 lprintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw->pw_gid,
 209                                         strerror(errno));
 210                 }
 211                 lprintf(CTDL_INFO, "Changing uid to %ld\n", (long)BBSUID);
 212                 if (setuid(BBSUID) != 0) {
 213                         lprintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 214                 }
 215 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 216                 prctl(PR_SET_DUMPABLE, 1);
 217 #endif
 218         }
 219
 220         /* We want to check for idle sessions once per minute */
 221         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 222
 223         /*
 224          * Now create a bunch of worker threads.
 225          */
 226         lprintf(CTDL_DEBUG, "Starting %d worker threads\n", config.c_min_workers-1);
 227         begin_critical_section(S_WORKER_LIST);
 228         for (i=0; i<(config.c_min_workers-1); ++i) {
 229                 create_worker();
 230         }
 231         end_critical_section(S_WORKER_LIST);
 232
 233         /* Now this thread can become a worker as well. */
 234         worker_thread(NULL);
 235
 236         /* Server is exiting. Wait for workers to shutdown. */
 237         lprintf(CTDL_INFO, "Server is shutting down.\n");
 238         master_cleanup(0);
 239         return(0);
 240 }