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
  19 #if TIME_WITH_SYS_TIME
  20 # include <sys/time.h>
  21 # include <time.h>
  22 #else
  23 # if HAVE_SYS_TIME_H
  24 #  include <sys/time.h>
  25 # else
  26 #  include <time.h>
  27 # endif
  28 #endif
  29
  30 #include <limits.h>
  31 #include <netinet/in.h>
  32 #include <netdb.h>
  33 #include <sys/un.h>
  34 #include <string.h>
  35 #include <pwd.h>
  36 #include <errno.h>
  37 #include <stdarg.h>
  38 #include <syslog.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 "dynloader.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         char *moddir;
  72         struct worker_node *wnp;
  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                         strcpy(tracefile, argv[a]);
  86                         strcpy(tracefile, &tracefile[2]);
  87                         freopen(tracefile, "r", stdin);
  88                         freopen(tracefile, "w", stdout);
  89                         freopen(tracefile, "w", stderr);
  90                 }
  91
  92                 /* run in the background if -d was specified */
  93                 else if (!strcmp(argv[a], "-d")) {
  94                         start_daemon( (strlen(tracefile) > 0) ? 0 : 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], "-f", 2)) {
 109                         do_defrag = 1;
 110                 }
 111
 112                 /* -r tells the server not to drop root permissions. don't use
 113                  * this unless you know what you're doing. this should be
 114                  * removed in the next release if it proves unnecessary. */
 115                 else if (!strcmp(argv[a], "-r"))
 116                         drop_root_perms = 0;
 117
 118                 /* any other parameter makes it crash and burn */
 119                 else {
 120                         lprintf(1,      "citserver: usage: "
 121                                         "citserver [-tTraceFile] [-d] [-f]"
 122                                         " [-xLogLevel] [-hHomeDir]\n");
 123                         exit(1);
 124                 }
 125
 126         }
 127
 128         /* Tell 'em who's in da house */
 129         lprintf(1,
 130 "\nMultithreaded message server for Citadel/UX\n"
 131 "Copyright (C) 1987-2001 by the Citadel/UX development team.\n"
 132 "Citadel/UX is free software, covered by the GNU General Public License, and\n"
 133 "you are welcome to change it and/or distribute copies of it under certain\n"
 134 "conditions.  There is absolutely no warranty for this software.  Please\n"
 135 "read the 'COPYING.txt' file for details.\n\n");
 136
 137         /* Initialize... */
 138         init_sysdep();
 139         openlog("citserver", LOG_PID, LOG_USER);
 140
 141         /* Load site-specific parameters */
 142         lprintf(7, "Loading citadel.config\n");
 143         get_config();
 144
 145
 146         /*
 147          * Do non system dependent startup functions.
 148          */
 149         master_startup();
 150
 151         /*
 152          * Bind the server to a Unix-domain socket.
 153          */
 154         CtdlRegisterServiceHook(0,
 155                                 "citadel.socket",
 156                                 citproto_begin_session,
 157                                 do_command_loop);
 158
 159         /*
 160          * Bind the server to our favorite TCP port (usually 504).
 161          */
 162         CtdlRegisterServiceHook(config.c_port_number,
 163                                 NULL,
 164                                 citproto_begin_session,
 165                                 do_command_loop);
 166
 167         /*
 168          * Load any server-side modules (plugins) available here.
 169          */
 170         lprintf(7, "Initializing loadable modules\n");
 171         if ((moddir = malloc(strlen(bbs_home_directory) + 9)) != NULL) {
 172                 sprintf(moddir, "%s/modules", bbs_home_directory);
 173                 DLoader_Init(moddir);
 174                 free(moddir);
 175         }
 176
 177         /*
 178          * The rescan pipe exists so that worker threads can be woken up and
 179          * told to re-scan the context list for fd's to listen on.  This is
 180          * necessary, for example, when a context is about to go idle and needs
 181          * to get back on that list.
 182          */
 183         if (pipe(rescan)) {
 184                 lprintf(1, "Can't create rescan pipe!\n");
 185                 exit(errno);
 186         }
 187
 188         init_master_fdset();
 189
 190         /*
 191          * Now that we've bound the sockets, change to the BBS user id and its
 192          * corresponding group ids
 193          */
 194         if (drop_root_perms) {
 195                 if ((pw = getpwuid(BBSUID)) == NULL)
 196                         lprintf(1, "WARNING: getpwuid(%d): %s\n"
 197                                    "Group IDs will be incorrect.\n", BBSUID,
 198                                 strerror(errno));
 199                 else {
 200                         initgroups(pw->pw_name, pw->pw_gid);
 201                         if (setgid(pw->pw_gid))
 202                                 lprintf(3, "setgid(%d): %s\n", pw->pw_gid,
 203                                         strerror(errno));
 204                 }
 205                 lprintf(7, "Changing uid to %d\n", BBSUID);
 206                 if (setuid(BBSUID) != 0) {
 207                         lprintf(3, "setuid() failed: %s\n", strerror(errno));
 208                 }
 209         }
 210
 211         /* We want to check for idle sessions once per minute */
 212         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 213
 214         /*
 215          * Now create a bunch of worker threads.
 216          */
 217         lprintf(9, "Starting %d worker threads\n", config.c_min_workers-1);
 218         begin_critical_section(S_WORKER_LIST);
 219         for (i=0; i<(config.c_min_workers-1); ++i) {
 220                 create_worker();
 221         }
 222         end_critical_section(S_WORKER_LIST);
 223
 224         /* Now this thread can become a worker as well. */
 225         initial_thread = pthread_self();
 226         worker_thread(NULL);
 227
 228         /* Server is exiting. Wait for workers to shutdown. */
 229         lprintf(7, "Waiting for worker threads to shut down\n");
 230
 231         begin_critical_section(S_WORKER_LIST);
 232         while (worker_list != NULL) {
 233                 wnp = worker_list;
 234                 worker_list = wnp->next;
 235
 236                 /* avoid deadlock with an exiting thread */
 237                 end_critical_section(S_WORKER_LIST);
 238                 if ((i = pthread_join(wnp->tid, NULL)))
 239                         lprintf(1, "pthread_join: %s\n", strerror(i));
 240                 phree(wnp);
 241                 begin_critical_section(S_WORKER_LIST);
 242         }
 243         end_critical_section(S_WORKER_LIST);
 244
 245         master_cleanup();
 246
 247         return(0);
 248 }