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                         chmod(tracefile, 0600);
  91                 }
  92
  93                 /* run in the background if -d was specified */
  94                 else if (!strcmp(argv[a], "-d")) {
  95                         start_daemon( (strlen(tracefile) > 0) ? 0 : 1 ) ;
  96                 }
  97
  98                 /* -x specifies the desired logging level */
  99                 else if (!strncmp(argv[a], "-x", 2)) {
 100                         verbosity = atoi(&argv[a][2]);
 101                 }
 102
 103                 else if (!strncmp(argv[a], "-h", 2)) {
 104                         safestrncpy(bbs_home_directory, &argv[a][2],
 105                                     sizeof bbs_home_directory);
 106                         home_specified = 1;
 107                 }
 108
 109                 else if (!strncmp(argv[a], "-f", 2)) {
 110                         do_defrag = 1;
 111                 }
 112
 113                 /* -r tells the server not to drop root permissions. don't use
 114                  * this unless you know what you're doing. this should be
 115                  * removed in the next release if it proves unnecessary. */
 116                 else if (!strcmp(argv[a], "-r"))
 117                         drop_root_perms = 0;
 118
 119                 /* any other parameter makes it crash and burn */
 120                 else {
 121                         lprintf(1,      "citserver: usage: "
 122                                         "citserver [-tTraceFile] [-d] [-f]"
 123                                         " [-xLogLevel] [-hHomeDir]\n");
 124                         exit(1);
 125                 }
 126
 127         }
 128
 129         /* Tell 'em who's in da house */
 130         lprintf(1,
 131 "\nMultithreaded message server for Citadel/UX\n"
 132 "Copyright (C) 1987-2001 by the Citadel/UX development team.\n"
 133 "Citadel/UX is free software, covered by the GNU General Public License, and\n"
 134 "you are welcome to change it and/or distribute copies of it under certain\n"
 135 "conditions.  There is absolutely no warranty for this software.  Please\n"
 136 "read the 'COPYING.txt' file for details.\n\n");
 137
 138         /* Initialize... */
 139         init_sysdep();
 140         openlog("citserver", LOG_PID, LOG_USER);
 141
 142         /* Load site-specific parameters */
 143         lprintf(7, "Loading citadel.config\n");
 144         get_config();
 145
 146
 147         /*
 148          * Do non system dependent startup functions.
 149          */
 150         master_startup();
 151
 152         /*
 153          * Bind the server to a Unix-domain socket.
 154          */
 155         CtdlRegisterServiceHook(0,
 156                                 "citadel.socket",
 157                                 citproto_begin_session,
 158                                 do_command_loop);
 159
 160         /*
 161          * Bind the server to our favorite TCP port (usually 504).
 162          */
 163         CtdlRegisterServiceHook(config.c_port_number,
 164                                 NULL,
 165                                 citproto_begin_session,
 166                                 do_command_loop);
 167
 168         /*
 169          * Load any server-side modules (plugins) available here.
 170          */
 171         lprintf(7, "Initializing loadable modules\n");
 172         if ((moddir = malloc(strlen(bbs_home_directory) + 9)) != NULL) {
 173                 sprintf(moddir, "%s/modules", bbs_home_directory);
 174                 DLoader_Init(moddir);
 175                 free(moddir);
 176         }
 177
 178         /*
 179          * The rescan pipe exists so that worker threads can be woken up and
 180          * told to re-scan the context list for fd's to listen on.  This is
 181          * necessary, for example, when a context is about to go idle and needs
 182          * to get back on that list.
 183          */
 184         if (pipe(rescan)) {
 185                 lprintf(1, "Can't create rescan pipe!\n");
 186                 exit(errno);
 187         }
 188
 189         init_master_fdset();
 190
 191         /*
 192          * Now that we've bound the sockets, change to the BBS user id and its
 193          * corresponding group ids
 194          */
 195         if (drop_root_perms) {
 196                 if ((pw = getpwuid(BBSUID)) == NULL)
 197                         lprintf(1, "WARNING: getpwuid(%d): %s\n"
 198                                    "Group IDs will be incorrect.\n", BBSUID,
 199                                 strerror(errno));
 200                 else {
 201                         initgroups(pw->pw_name, pw->pw_gid);
 202                         if (setgid(pw->pw_gid))
 203                                 lprintf(3, "setgid(%d): %s\n", pw->pw_gid,
 204                                         strerror(errno));
 205                 }
 206                 lprintf(7, "Changing uid to %d\n", BBSUID);
 207                 if (setuid(BBSUID) != 0) {
 208                         lprintf(3, "setuid() failed: %s\n", strerror(errno));
 209                 }
 210         }
 211
 212         /* We want to check for idle sessions once per minute */
 213         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 214
 215         /*
 216          * Now create a bunch of worker threads.
 217          */
 218         lprintf(9, "Starting %d worker threads\n", config.c_min_workers-1);
 219         begin_critical_section(S_WORKER_LIST);
 220         for (i=0; i<(config.c_min_workers-1); ++i) {
 221                 create_worker();
 222         }
 223         end_critical_section(S_WORKER_LIST);
 224
 225         /* Now this thread can become a worker as well. */
 226         initial_thread = pthread_self();
 227         worker_thread(NULL);
 228
 229         /* Server is exiting. Wait for workers to shutdown. */
 230         lprintf(7, "Waiting for worker threads to shut down\n");
 231
 232         begin_critical_section(S_WORKER_LIST);
 233         while (worker_list != NULL) {
 234                 wnp = worker_list;
 235                 worker_list = wnp->next;
 236
 237                 /* avoid deadlock with an exiting thread */
 238                 end_critical_section(S_WORKER_LIST);
 239                 if ((i = pthread_join(wnp->tid, NULL)))
 240                         lprintf(1, "pthread_join: %s\n", strerror(i));
 241                 phree(wnp);
 242                 begin_critical_section(S_WORKER_LIST);
 243         }
 244         end_critical_section(S_WORKER_LIST);
 245
 246         master_cleanup();
 247
 248         return(0);
 249 }