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         struct worker_node *wnp;
  75         size_t size;
  76
  77         /* specify default port name and trace file */
  78         strcpy(tracefile, "");
  79
  80         /* initialize the master context */
  81         InitializeMasterCC();
  82
  83         /* parse command-line arguments */
  84         for (a=1; a<argc; ++a) {
  85
  86                 /* -t specifies where to log trace messages to */
  87                 if (!strncmp(argv[a], "-t", 2)) {
  88                         safestrncpy(tracefile, argv[a], sizeof tracefile);
  89                         strcpy(tracefile, &tracefile[2]);
  90                         freopen(tracefile, "r", stdin);
  91                         freopen(tracefile, "w", stdout);
  92                         freopen(tracefile, "w", stderr);
  93                         chmod(tracefile, 0600);
  94                 }
  95
  96                 else if (!strncmp(argv[a], "-l", 2)) {
  97                         safestrncpy(tracefile, argv[a], sizeof tracefile);
  98                         strcpy(tracefile, &tracefile[2]);
  99                         syslog_facility = SyslogFacility(tracefile);
 100                         if (syslog_facility >= 0) {
 101                                 openlog("citadel", LOG_PID, syslog_facility);
 102                         }
 103                 }
 104
 105                 /* run in the background if -d was specified */
 106                 else if (!strcmp(argv[a], "-d")) {
 107                         start_daemon( (strlen(tracefile) > 0) ? 0 : 1 ) ;
 108                 }
 109
 110                 /* -x specifies the desired logging level */
 111                 else if (!strncmp(argv[a], "-x", 2)) {
 112                         verbosity = atoi(&argv[a][2]);
 113                 }
 114
 115                 else if (!strncmp(argv[a], "-h", 2)) {
 116                         safestrncpy(bbs_home_directory, &argv[a][2],
 117                                     sizeof bbs_home_directory);
 118                         home_specified = 1;
 119                 }
 120
 121                 else if (!strncmp(argv[a], "-f", 2)) {
 122                         do_defrag = 1;
 123                 }
 124
 125                 /* -r tells the server not to drop root permissions. don't use
 126                  * this unless you know what you're doing. this should be
 127                  * removed in the next release if it proves unnecessary. */
 128                 else if (!strcmp(argv[a], "-r"))
 129                         drop_root_perms = 0;
 130
 131                 /* any other parameter makes it crash and burn */
 132                 else {
 133                         lprintf(CTDL_EMERG,     "citserver: usage: "
 134                                         "citserver [-tTraceFile] "
 135                                         "[-lLogFacility] "
 136                                         "[-d] [-f]"
 137                                         " [-xLogLevel] [-hHomeDir]\n");
 138                         exit(1);
 139                 }
 140
 141         }
 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/UX messaging server engine v%d.%02d ***\n",
 148                 (REV_LEVEL/100), (REV_LEVEL%100));
 149         lprintf(CTDL_NOTICE,
 150                 "Copyright (C) 1987-2003 by the Citadel/UX 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
 156         /* Load site-specific parameters, and set the ipgm secret */
 157         lprintf(CTDL_INFO, "Loading citadel.config\n");
 158         get_config();
 159         config.c_ipgm_secret = rand();
 160         put_config();
 161
 162         /* Initialize... */
 163         init_sysdep();
 164
 165         /*
 166          * Do non system dependent startup functions.
 167          */
 168         master_startup();
 169
 170         /*
 171          * Bind the server to a Unix-domain socket.
 172          */
 173         CtdlRegisterServiceHook(0,
 174                                 "citadel.socket",
 175                                 citproto_begin_session,
 176                                 do_command_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
 186         /*
 187          * Load any server-side extensions available here.
 188          */
 189         lprintf(CTDL_INFO, "Initializing server extensions\n");
 190         size = strlen(bbs_home_directory) + 9;
 191         initialize_server_extensions();
 192
 193         /*
 194          * The rescan pipe exists so that worker threads can be woken up and
 195          * told to re-scan the context list for fd's to listen on.  This is
 196          * necessary, for example, when a context is about to go idle and needs
 197          * to get back on that list.
 198          */
 199         if (pipe(rescan)) {
 200                 lprintf(CTDL_EMERG, "Can't create rescan pipe!\n");
 201                 exit(errno);
 202         }
 203
 204         init_master_fdset();
 205
 206         /*
 207          * Now that we've bound the sockets, change to the BBS user id and its
 208          * corresponding group ids
 209          */
 210         if (drop_root_perms) {
 211                 if ((pw = getpwuid(BBSUID)) == NULL)
 212                         lprintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 213                                    "Group IDs will be incorrect.\n", (long)BBSUID,
 214                                 strerror(errno));
 215                 else {
 216                         initgroups(pw->pw_name, pw->pw_gid);
 217                         if (setgid(pw->pw_gid))
 218                                 lprintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw->pw_gid,
 219                                         strerror(errno));
 220                 }
 221                 lprintf(CTDL_INFO, "Changing uid to %ld\n", (long)BBSUID);
 222                 if (setuid(BBSUID) != 0) {
 223                         lprintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 224                 }
 225 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 226                 prctl(PR_SET_DUMPABLE, 1);
 227 #endif
 228         }
 229
 230         /* We want to check for idle sessions once per minute */
 231         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 232
 233         /*
 234          * Now create a bunch of worker threads.
 235          */
 236         lprintf(CTDL_DEBUG, "Starting %d worker threads\n", config.c_min_workers-1);
 237         begin_critical_section(S_WORKER_LIST);
 238         for (i=0; i<(config.c_min_workers-1); ++i) {
 239                 create_worker();
 240         }
 241         end_critical_section(S_WORKER_LIST);
 242
 243         /* Now this thread can become a worker as well. */
 244         initial_thread = pthread_self();
 245         worker_thread(NULL);
 246
 247         /* Server is exiting. Wait for workers to shutdown. */
 248         lprintf(CTDL_INFO, "Waiting for worker threads to shut down\n");
 249
 250         begin_critical_section(S_WORKER_LIST);
 251         while (worker_list != NULL) {
 252                 wnp = worker_list;
 253                 worker_list = wnp->next;
 254
 255                 /* avoid deadlock with an exiting thread */
 256                 end_critical_section(S_WORKER_LIST);
 257                 if ((i = pthread_join(wnp->tid, NULL)))
 258                         lprintf(CTDL_CRIT, "pthread_join: %s\n", strerror(i));
 259                 free(wnp);
 260                 begin_critical_section(S_WORKER_LIST);
 261         }
 262         end_critical_section(S_WORKER_LIST);
 263
 264         master_cleanup();
 265         return(0);
 266 }