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 /*
  66  * Here's where it all begins.
  67  */
  68 int main(int argc, char **argv)
  69 {
  70         char tracefile[128];            /* Name of file to log traces to */
  71         int a, i;                       /* General-purpose variables */
  72         struct passwd *pw;
  73         int drop_root_perms = 1;
  74         size_t size;
  75
  76         /* specify default port name and trace file */
  77         strcpy(tracefile, "");
  78
  79         /* initialize the master context */
  80         InitializeMasterCC();
  81
  82         /* parse command-line arguments */
  83         for (a=1; a<argc; ++a) {
  84
  85                 /* -t specifies where to log trace messages to */
  86                 if (!strncmp(argv[a], "-t", 2)) {
  87                         safestrncpy(tracefile, argv[a], sizeof tracefile);
  88                         strcpy(tracefile, &tracefile[2]);
  89                         freopen(tracefile, "r", stdin);
  90                         freopen(tracefile, "w", stdout);
  91                         freopen(tracefile, "w", stderr);
  92                         chmod(tracefile, 0600);
  93                 }
  94
  95                 else if (!strncmp(argv[a], "-l", 2)) {
  96                         safestrncpy(tracefile, argv[a], sizeof tracefile);
  97                         strcpy(tracefile, &tracefile[2]);
  98                         syslog_facility = SyslogFacility(tracefile);
  99                         if (syslog_facility >= 0) {
 100                                 openlog("citadel", LOG_PID, syslog_facility);
 101                         }
 102                 }
 103
 104                 /* run in the background if -d was specified */
 105                 else if (!strcmp(argv[a], "-d")) {
 106                         start_daemon( (strlen(tracefile) > 0) ? 0 : 1 ) ;
 107                 }
 108
 109                 /* -x specifies the desired logging level */
 110                 else if (!strncmp(argv[a], "-x", 2)) {
 111                         verbosity = atoi(&argv[a][2]);
 112                 }
 113
 114                 else if (!strncmp(argv[a], "-h", 2)) {
 115                         safestrncpy(bbs_home_directory, &argv[a][2],
 116                                     sizeof bbs_home_directory);
 117                         home_specified = 1;
 118                 }
 119
 120                 else if (!strncmp(argv[a], "-f", 2)) {
 121                         do_defrag = 1;
 122                 }
 123
 124                 /* -r tells the server not to drop root permissions. don't use
 125                  * this unless you know what you're doing. this should be
 126                  * removed in the next release if it proves unnecessary. */
 127                 else if (!strcmp(argv[a], "-r"))
 128                         drop_root_perms = 0;
 129
 130                 /* any other parameter makes it crash and burn */
 131                 else {
 132                         lprintf(CTDL_EMERG,     "citserver: usage: "
 133                                         "citserver [-tTraceFile] "
 134                                         "[-lLogFacility] "
 135                                         "[-d] [-f]"
 136                                         " [-xLogLevel] [-hHomeDir]\n");
 137                         exit(1);
 138                 }
 139
 140         }
 141
 142         /* Tell 'em who's in da house */
 143         lprintf(CTDL_NOTICE, "\n");
 144         lprintf(CTDL_NOTICE, "\n");
 145         lprintf(CTDL_NOTICE,
 146                 "*** Citadel server engine v%d.%02d ***\n",
 147                 (REV_LEVEL/100), (REV_LEVEL%100));
 148         lprintf(CTDL_NOTICE,
 149                 "Copyright (C) 1987-2004 by the Citadel development team.\n");
 150         lprintf(CTDL_NOTICE,
 151                 "This program is distributed under the terms of the GNU "
 152                 "General Public License.\n");
 153         lprintf(CTDL_NOTICE, "\n");
 154
 155         /* Load site-specific parameters, and set the ipgm secret */
 156         lprintf(CTDL_INFO, "Loading citadel.config\n");
 157         get_config();
 158         config.c_ipgm_secret = rand();
 159         put_config();
 160
 161         /* Initialize... */
 162         init_sysdep();
 163
 164         /*
 165          * Do non system dependent startup functions.
 166          */
 167         master_startup();
 168
 169         /*
 170          * Bind the server to a Unix-domain socket.
 171          */
 172         CtdlRegisterServiceHook(0,
 173                                 "citadel.socket",
 174                                 citproto_begin_session,
 175                                 do_command_loop,
 176                                 do_async_loop);
 177
 178         /*
 179          * Bind the server to our favorite TCP port (usually 504).
 180          */
 181         CtdlRegisterServiceHook(config.c_port_number,
 182                                 NULL,
 183                                 citproto_begin_session,
 184                                 do_command_loop,
 185                                 do_async_loop);
 186
 187         /*
 188          * Load any server-side extensions available here.
 189          */
 190         lprintf(CTDL_INFO, "Initializing server extensions\n");
 191         size = strlen(bbs_home_directory) + 9;
 192         initialize_server_extensions();
 193
 194         /*
 195          * Now that we've bound the sockets, change to the BBS user id and its
 196          * corresponding group ids
 197          */
 198         if (drop_root_perms) {
 199                 if ((pw = getpwuid(BBSUID)) == NULL)
 200                         lprintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 201                                    "Group IDs will be incorrect.\n", (long)BBSUID,
 202                                 strerror(errno));
 203                 else {
 204                         initgroups(pw->pw_name, pw->pw_gid);
 205                         if (setgid(pw->pw_gid))
 206                                 lprintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw->pw_gid,
 207                                         strerror(errno));
 208                 }
 209                 lprintf(CTDL_INFO, "Changing uid to %ld\n", (long)BBSUID);
 210                 if (setuid(BBSUID) != 0) {
 211                         lprintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 212                 }
 213 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 214                 prctl(PR_SET_DUMPABLE, 1);
 215 #endif
 216         }
 217
 218         /* We want to check for idle sessions once per minute */
 219         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 220
 221         /*
 222          * Now create a bunch of worker threads.
 223          */
 224         lprintf(CTDL_DEBUG, "Starting %d worker threads\n", config.c_min_workers-1);
 225         begin_critical_section(S_WORKER_LIST);
 226         for (i=0; i<(config.c_min_workers-1); ++i) {
 227                 create_worker();
 228         }
 229         end_critical_section(S_WORKER_LIST);
 230
 231         /* Now this thread can become a worker as well. */
 232         worker_thread(NULL);
 233
 234         /* Server is exiting. Wait for workers to shutdown. */
 235         lprintf(CTDL_INFO, "Server is shutting down.\n");
 236         master_cleanup();
 237         return(0);
 238 }