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         /* parse command-line arguments */
  82         for (a=1; a<argc; ++a) {
  83
  84                 if (!strncmp(argv[a], "-l", 2)) {
  85                         safestrncpy(facility, &argv[a][2], sizeof(facility));
  86                         syslog_facility = SyslogFacility(facility);
  87                         enable_syslog = 1;
  88                 }
  89
  90                 /* run in the background if -d was specified */
  91                 else if (!strcmp(argv[a], "-d")) {
  92                         running_as_daemon = 1;
  93                 }
  94
  95                 /* -x specifies the desired logging level */
  96                 else if (!strncmp(argv[a], "-x", 2)) {
  97                         verbosity = atoi(&argv[a][2]);
  98                 }
  99
 100                 else if (!strncmp(argv[a], "-h", 2)) {
 101                         safestrncpy(ctdl_home_directory, &argv[a][2],
 102                                     sizeof ctdl_home_directory);
 103                         home_specified = 1;
 104                 }
 105
 106                 else if (!strncmp(argv[a], "-t", 2)) {
 107                         freopen(&argv[a][2], "w", stderr);
 108                 }
 109
 110                 else if (!strncmp(argv[a], "-f", 2)) {
 111                         do_defrag = 1;
 112                 }
 113
 114                 /* -r tells the server not to drop root permissions. don't use
 115                  * this unless you know what you're doing. this should be
 116                  * removed in the next release if it proves unnecessary. */
 117                 else if (!strcmp(argv[a], "-r"))
 118                         drop_root_perms = 0;
 119
 120                 /* any other parameter makes it crash and burn */
 121                 else {
 122                         lprintf(CTDL_EMERG,     "citserver: usage: "
 123                                         "citserver "
 124                                         "[-lLogFacility] "
 125                                         "[-d] [-f]"
 126                                         " [-tTraceFile]"
 127                                         " [-xLogLevel] [-hHomeDir]\n");
 128                         exit(1);
 129                 }
 130
 131         }
 132
 133         /* daemonize, if we were asked to */
 134         if (running_as_daemon) {
 135                 start_daemon(0);
 136                 drop_root_perms = 1;
 137         }
 138
 139         /* initialize the syslog facility */
 140         if (enable_syslog) {
 141                 if (running_as_daemon) {
 142                         openlog("citadel", LOG_NDELAY, syslog_facility);
 143                 }
 144                 else {
 145                         openlog("citadel", LOG_PERROR|LOG_NDELAY,
 146                                 syslog_facility);
 147                 }
 148                 setlogmask(LOG_UPTO(verbosity));
 149         }
 150
 151         /* Tell 'em who's in da house */
 152         lprintf(CTDL_NOTICE, "\n");
 153         lprintf(CTDL_NOTICE, "\n");
 154         lprintf(CTDL_NOTICE,
 155                 "*** Citadel server engine v%d.%02d ***\n",
 156                 (REV_LEVEL/100), (REV_LEVEL%100));
 157         lprintf(CTDL_NOTICE,
 158                 "Copyright (C) 1987-2005 by the Citadel development team.\n");
 159         lprintf(CTDL_NOTICE,
 160                 "This program is distributed under the terms of the GNU "
 161                 "General Public License.\n");
 162         lprintf(CTDL_NOTICE, "\n");
 163         lprintf(CTDL_DEBUG, "Called as: %s\n", argv[0]);
 164
 165         /* Load site-specific parameters, and set the ipgm secret */
 166         lprintf(CTDL_INFO, "Loading citadel.config\n");
 167         get_config();
 168         config.c_ipgm_secret = rand();
 169         put_config();
 170
 171         /* Initialize... */
 172         init_sysdep();
 173
 174         /*
 175          * Do non system dependent startup functions.
 176          */
 177         master_startup();
 178
 179         /*
 180          * Bind the server to a Unix-domain socket.
 181          */
 182         CtdlRegisterServiceHook(0,
 183 #ifndef HAVE_RUN_DIR
 184                                          "."
 185 #else
 186                                          RUN_DIR
 187 #endif
 188                                 "/citadel.socket",
 189                                 citproto_begin_session,
 190                                 do_command_loop,
 191                                 do_async_loop);
 192
 193         /*
 194          * Bind the server to our favorite TCP port (usually 504).
 195          */
 196         CtdlRegisterServiceHook(config.c_port_number,
 197                                 NULL,
 198                                 citproto_begin_session,
 199                                 do_command_loop,
 200                                 do_async_loop);
 201
 202         /*
 203          * Load any server-side extensions available here.
 204          */
 205         lprintf(CTDL_INFO, "Initializing server extensions\n");
 206         size = strlen(ctdl_home_directory) + 9;
 207         initialize_server_extensions();
 208
 209         /*
 210          * Now that we've bound the sockets, change to the Citadel user id and its
 211          * corresponding group ids
 212          */
 213         if (drop_root_perms) {
 214                 if ((pw = getpwuid(CTDLUID)) == NULL)
 215                         lprintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 216                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 217                                 strerror(errno));
 218                 else {
 219                         initgroups(pw->pw_name, pw->pw_gid);
 220                         if (setgid(pw->pw_gid))
 221                                 lprintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw->pw_gid,
 222                                         strerror(errno));
 223                 }
 224                 lprintf(CTDL_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 225                 if (setuid(CTDLUID) != 0) {
 226                         lprintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 227                 }
 228 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 229                 prctl(PR_SET_DUMPABLE, 1);
 230 #endif
 231         }
 232
 233         /* We want to check for idle sessions once per minute */
 234         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 235
 236         /*
 237          * Now create a bunch of worker threads.
 238          */
 239         lprintf(CTDL_DEBUG, "Starting %d worker threads\n",
 240                 config.c_min_workers-1);
 241         begin_critical_section(S_WORKER_LIST);
 242         for (i=0; i<(config.c_min_workers-1); ++i) {
 243                 create_worker();
 244         }
 245         end_critical_section(S_WORKER_LIST);
 246
 247         /* Create the indexer thread. */
 248         create_maintenance_threads();
 249
 250         /* This thread is now useless.  It can't be turned into a worker
 251          * thread because its stack is too small, but it can't be killed
 252          * either because the whole server process would exit.  So we just
 253          * join to the first worker thread and exit when it exits.
 254          */
 255         pthread_join(worker_list->tid, NULL);
 256         master_cleanup(0);
 257         return(0);
 258 }