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 #include "citadel.h"
  44 #include "server.h"
  45 #include "serv_extensions.h"
  46 #include "sysdep_decls.h"
  47 #include "citserver.h"
  48 #include "support.h"
  49 #include "config.h"
  50 #include "database.h"
  51 #include "housekeeping.h"
  52 #include "tools.h"
  53
  54 #ifdef HAVE_SYS_SELECT_H
  55 #include <sys/select.h>
  56 #endif
  57
  58 #ifndef HAVE_SNPRINTF
  59 #include "snprintf.h"
  60 #endif
  61
  62 /*
  63  * Here's where it all begins.
  64  */
  65 int main(int argc, char **argv)
  66 {
  67         char tracefile[128];            /* Name of file to log traces to */
  68         int a, i;                       /* General-purpose variables */
  69         struct passwd *pw;
  70         int drop_root_perms = 1;
  71         struct worker_node *wnp;
  72         size_t size;
  73
  74         /* specify default port name and trace file */
  75         strcpy(tracefile, "");
  76
  77         /* initialize the master context */
  78         InitializeMasterCC();
  79
  80         /* parse command-line arguments */
  81         for (a=1; a<argc; ++a) {
  82
  83                 /* -t specifies where to log trace messages to */
  84                 if (!strncmp(argv[a], "-t", 2)) {
  85                         safestrncpy(tracefile, argv[a], sizeof tracefile);
  86                         strcpy(tracefile, &tracefile[2]);
  87                         freopen(tracefile, "r", stdin);
  88                         freopen(tracefile, "w", stdout);
  89                         freopen(tracefile, "w", stderr);
  90                         chmod(tracefile, 0600);
  91                 }
  92
  93                 else if (!strncmp(argv[a], "-l", 2)) {
  94                         safestrncpy(tracefile, argv[a], sizeof tracefile);
  95                         strcpy(tracefile, &tracefile[2]);
  96                         syslog_facility = SyslogFacility(tracefile);
  97                         if (syslog_facility >= 0) {
  98                                 openlog("citadel", LOG_PID, syslog_facility);
  99                         }
 100                 }
 101
 102                 /* run in the background if -d was specified */
 103                 else if (!strcmp(argv[a], "-d")) {
 104                         start_daemon( (strlen(tracefile) > 0) ? 0 : 1 ) ;
 105                 }
 106
 107                 /* -x specifies the desired logging level */
 108                 else if (!strncmp(argv[a], "-x", 2)) {
 109                         verbosity = atoi(&argv[a][2]);
 110                 }
 111
 112                 else if (!strncmp(argv[a], "-h", 2)) {
 113                         safestrncpy(bbs_home_directory, &argv[a][2],
 114                                     sizeof bbs_home_directory);
 115                         home_specified = 1;
 116                 }
 117
 118                 else if (!strncmp(argv[a], "-f", 2)) {
 119                         do_defrag = 1;
 120                 }
 121
 122                 /* -r tells the server not to drop root permissions. don't use
 123                  * this unless you know what you're doing. this should be
 124                  * removed in the next release if it proves unnecessary. */
 125                 else if (!strcmp(argv[a], "-r"))
 126                         drop_root_perms = 0;
 127
 128                 /* any other parameter makes it crash and burn */
 129                 else {
 130                         lprintf(1,      "citserver: usage: "
 131                                         "citserver [-tTraceFile] "
 132                                         "[-lLogFacility] "
 133                                         "[-d] [-f]"
 134                                         " [-xLogLevel] [-hHomeDir]\n");
 135                         exit(1);
 136                 }
 137
 138         }
 139
 140         /* Tell 'em who's in da house */
 141         lprintf(1, "\n");
 142         lprintf(1, "\n");
 143         lprintf(1,"*** Citadel/UX messaging server engine v%d.%02d ***\n",
 144                 (REV_LEVEL/100),
 145                 (REV_LEVEL%100) );
 146         lprintf(1,"Copyright (C) 1987-2003 by the Citadel/UX development team.\n");
 147         lprintf(1,"This program is distributed under the terms of the GNU ");
 148         lprintf(1,"General Public License.\n");
 149         lprintf(1, "\n");
 150
 151         /* Load site-specific parameters, and set the ipgm secret */
 152         lprintf(7, "Loading citadel.config\n");
 153         get_config();
 154         config.c_ipgm_secret = rand();
 155         put_config();
 156
 157         /* Initialize... */
 158         init_sysdep();
 159
 160         /*
 161          * Do non system dependent startup functions.
 162          */
 163         master_startup();
 164
 165         /*
 166          * Bind the server to a Unix-domain socket.
 167          */
 168         CtdlRegisterServiceHook(0,
 169                                 "citadel.socket",
 170                                 citproto_begin_session,
 171                                 do_command_loop);
 172
 173         /*
 174          * Bind the server to our favorite TCP port (usually 504).
 175          */
 176         CtdlRegisterServiceHook(config.c_port_number,
 177                                 NULL,
 178                                 citproto_begin_session,
 179                                 do_command_loop);
 180
 181         /*
 182          * Load any server-side extensions available here.
 183          */
 184         lprintf(7, "Initializing server extensions\n");
 185         size = strlen(bbs_home_directory) + 9;
 186         initialize_server_extensions();
 187
 188         /*
 189          * The rescan pipe exists so that worker threads can be woken up and
 190          * told to re-scan the context list for fd's to listen on.  This is
 191          * necessary, for example, when a context is about to go idle and needs
 192          * to get back on that list.
 193          */
 194         if (pipe(rescan)) {
 195                 lprintf(1, "Can't create rescan pipe!\n");
 196                 exit(errno);
 197         }
 198
 199         init_master_fdset();
 200
 201         /*
 202          * Now that we've bound the sockets, change to the BBS user id and its
 203          * corresponding group ids
 204          */
 205         if (drop_root_perms) {
 206                 if ((pw = getpwuid(BBSUID)) == NULL)
 207                         lprintf(1, "WARNING: getpwuid(%ld): %s\n"
 208                                    "Group IDs will be incorrect.\n", (long)BBSUID,
 209                                 strerror(errno));
 210                 else {
 211                         initgroups(pw->pw_name, pw->pw_gid);
 212                         if (setgid(pw->pw_gid))
 213                                 lprintf(3, "setgid(%ld): %s\n", (long)pw->pw_gid,
 214                                         strerror(errno));
 215                 }
 216                 lprintf(7, "Changing uid to %ld\n", (long)BBSUID);
 217                 if (setuid(BBSUID) != 0) {
 218                         lprintf(3, "setuid() failed: %s\n", strerror(errno));
 219                 }
 220         }
 221
 222         /* We want to check for idle sessions once per minute */
 223         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 224
 225         /*
 226          * Now create a bunch of worker threads.
 227          */
 228         lprintf(9, "Starting %d worker threads\n", config.c_min_workers-1);
 229         begin_critical_section(S_WORKER_LIST);
 230         for (i=0; i<(config.c_min_workers-1); ++i) {
 231                 create_worker();
 232         }
 233         end_critical_section(S_WORKER_LIST);
 234
 235         /* Now this thread can become a worker as well. */
 236         initial_thread = pthread_self();
 237         worker_thread(NULL);
 238
 239         /* Server is exiting. Wait for workers to shutdown. */
 240         lprintf(7, "Waiting for worker threads to shut down\n");
 241
 242         begin_critical_section(S_WORKER_LIST);
 243         while (worker_list != NULL) {
 244                 wnp = worker_list;
 245                 worker_list = wnp->next;
 246
 247                 /* avoid deadlock with an exiting thread */
 248                 end_critical_section(S_WORKER_LIST);
 249                 if ((i = pthread_join(wnp->tid, NULL)))
 250                         lprintf(1, "pthread_join: %s\n", strerror(i));
 251                 phree(wnp);
 252                 begin_critical_section(S_WORKER_LIST);
 253         }
 254         end_critical_section(S_WORKER_LIST);
 255
 256         master_cleanup();
 257
 258         return(0);
 259 }