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 #include <pwd.h>
  41 #ifdef HAVE_PTHREAD_H
  42 #include <pthread.h>
  43 #endif
  44 #ifdef HAVE_SYS_PRCTL_H
  45 #include <sys/prctl.h>
  46 #endif
  47 #include "citadel.h"
  48 #include "server.h"
  49 #include "serv_extensions.h"
  50 #include "sysdep_decls.h"
  51 #include "citserver.h"
  52 #include "support.h"
  53 #include "config.h"
  54 #include "control.h"
  55 #include "database.h"
  56 #include "housekeeping.h"
  57 #include "tools.h"
  58 #include "citadel_dirs.c"
  59
  60 #ifdef HAVE_SYS_SELECT_H
  61 #include <sys/select.h>
  62 #endif
  63
  64 #ifndef HAVE_SNPRINTF
  65 #include "snprintf.h"
  66 #endif
  67
  68 int running_as_daemon = 0;
  69
  70 /*
  71  * Here's where it all begins.
  72  */
  73 int main(int argc, char **argv)
  74 {
  75         char facility[32];
  76         int a, i;                       /* General-purpose variables */
  77         struct passwd *pw;
  78         int drop_root_perms = 1;
  79         size_t size;
  80         int relh=0;
  81         int home=0;
  82         char relhome[PATH_MAX]="";
  83         char ctdldir[PATH_MAX]=CTDLDIR;
  84 #ifdef HAVE_RUN_DIR
  85         struct stat filestats;
  86 #endif
  87
  88         /* initialize the master context */
  89         InitializeMasterCC();
  90
  91         /* parse command-line arguments */
  92         for (a=1; a<argc; ++a) {
  93
  94                 if (!strncmp(argv[a], "-l", 2)) {
  95                         safestrncpy(facility, &argv[a][2], sizeof(facility));
  96                         syslog_facility = SyslogFacility(facility);
  97                         enable_syslog = 1;
  98                 }
  99
 100                 /* run in the background if -d was specified */
 101                 else if (!strcmp(argv[a], "-d")) {
 102                         running_as_daemon = 1;
 103                 }
 104
 105                 /* -x specifies the desired logging level */
 106                 else if (!strncmp(argv[a], "-x", 2)) {
 107                         verbosity = atoi(&argv[a][2]);
 108                 }
 109
 110                 else if (!strncmp(argv[a], "-h", 2)) {
 111                         relh=argv[a][2]!='/';
 112                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 113                                                                    sizeof ctdl_home_directory);
 114                         else
 115                                 safestrncpy(relhome, &argv[a][2],
 116                                                         sizeof relhome);
 117                         home_specified = 1;
 118                         home=1;
 119                 }
 120
 121                 else if (!strncmp(argv[a], "-t", 2)) {
 122                         freopen(&argv[a][2], "w", stderr);
 123                 }
 124
 125                 else if (!strncmp(argv[a], "-f", 2)) {
 126                         do_defrag = 1;
 127                 }
 128
 129                 /* -r tells the server not to drop root permissions. don't use
 130                  * this unless you know what you're doing. this should be
 131                  * removed in the next release if it proves unnecessary. */
 132                 else if (!strcmp(argv[a], "-r"))
 133                         drop_root_perms = 0;
 134
 135                 /* any other parameter makes it crash and burn */
 136                 else {
 137                         lprintf(CTDL_EMERG,     "citserver: usage: "
 138                                         "citserver "
 139                                         "[-lLogFacility] "
 140                                         "[-d] [-f]"
 141                                         " [-tTraceFile]"
 142                                         " [-xLogLevel] [-hHomeDir]\n");
 143                         exit(1);
 144                 }
 145
 146         }
 147
 148         calc_dirs_n_files(relh, home, relhome, ctdldir);
 149
 150         /* daemonize, if we were asked to */
 151         if (running_as_daemon) {
 152                 start_daemon(0);
 153                 drop_root_perms = 1;
 154         }
 155
 156         /* Initialize the syslogger.  Yes, we are really using 0 as the
 157          * facility, because we are going to bitwise-OR the facility to
 158          * the severity of each message, allowing us to write to other
 159          * facilities when we need to...
 160          */
 161         if (enable_syslog) {
 162                 if (running_as_daemon) {
 163                         openlog("citadel", LOG_NDELAY, 0);
 164                 }
 165                 else {
 166                         openlog("citadel", LOG_PERROR|LOG_NDELAY, 0);
 167                 }
 168                 setlogmask(LOG_UPTO(verbosity));
 169         }
 170
 171         /* Tell 'em who's in da house */
 172         lprintf(CTDL_NOTICE, "\n");
 173         lprintf(CTDL_NOTICE, "\n");
 174         lprintf(CTDL_NOTICE,
 175                 "*** Citadel server engine v%d.%02d ***\n",
 176                 (REV_LEVEL/100), (REV_LEVEL%100));
 177         lprintf(CTDL_NOTICE,
 178                 "Copyright (C) 1987-2007 by the Citadel development team.\n");
 179         lprintf(CTDL_NOTICE,
 180                 "This program is distributed under the terms of the GNU "
 181                 "General Public License.\n");
 182         lprintf(CTDL_NOTICE, "\n");
 183         lprintf(CTDL_DEBUG, "Called as: %s\n", argv[0]);
 184
 185         /* Load site-specific parameters, and set the ipgm secret */
 186         lprintf(CTDL_INFO, "Loading citadel.config\n");
 187         get_config();
 188         config.c_ipgm_secret = rand();
 189         put_config();
 190
 191         lprintf(CTDL_INFO, "Acquiring control record\n");
 192         get_control();
 193
 194 #ifdef HAVE_RUN_DIR
 195         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 196
 197         if (stat(ctdl_run_dir, &filestats)==-1){
 198                 pw=getpwuid(config.c_ctdluid);
 199                 mkdir(ctdl_run_dir, 0755);
 200                 chown(ctdl_run_dir, config.c_ctdluid, (pw==NULL)?-1:pw->pw_gid);
 201
 202         }
 203
 204
 205 #endif
 206
 207         /* Initialize... */
 208         init_sysdep();
 209
 210         /*
 211          * Do non system dependent startup functions.
 212          */
 213         master_startup();
 214
 215         /*
 216          * Bind the server to a Unix-domain socket.
 217          */
 218         CtdlRegisterServiceHook(0,
 219                                                         file_citadel_socket,
 220                                                         citproto_begin_session,
 221                                                         do_command_loop,
 222                                                         do_async_loop);
 223
 224         /*
 225          * Bind the server to our favorite TCP port (usually 504).
 226          */
 227         CtdlRegisterServiceHook(config.c_port_number,
 228                                 NULL,
 229                                 citproto_begin_session,
 230                                 do_command_loop,
 231                                 do_async_loop);
 232
 233         /*
 234          * Load any server-side extensions available here.
 235          */
 236         lprintf(CTDL_INFO, "Initializing server extensions\n");
 237         size = strlen(ctdl_home_directory) + 9;
 238         initialize_server_extensions();
 239
 240         /*
 241          * Now that we've bound the sockets, change to the Citadel user id and its
 242          * corresponding group ids
 243          */
 244         if (drop_root_perms) {
 245                 if ((pw = getpwuid(CTDLUID)) == NULL)
 246                         lprintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 247                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 248                                 strerror(errno));
 249                 else {
 250                         initgroups(pw->pw_name, pw->pw_gid);
 251                         if (setgid(pw->pw_gid))
 252                                 lprintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw->pw_gid,
 253                                         strerror(errno));
 254                 }
 255                 lprintf(CTDL_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 256                 if (setuid(CTDLUID) != 0) {
 257                         lprintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 258                 }
 259 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 260                 prctl(PR_SET_DUMPABLE, 1);
 261 #endif
 262         }
 263
 264         /* We want to check for idle sessions once per minute */
 265         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 266
 267         /*
 268          * Now create a bunch of worker threads.
 269          */
 270         lprintf(CTDL_DEBUG, "Starting %d worker threads\n",
 271                 config.c_min_workers-1);
 272         begin_critical_section(S_WORKER_LIST);
 273         for (i=0; i<(config.c_min_workers-1); ++i) {
 274                 create_worker();
 275         }
 276         end_critical_section(S_WORKER_LIST);
 277
 278         /* Create the indexer thread. */
 279         create_maintenance_threads();
 280
 281         /* This thread is now useless.  It can't be turned into a worker
 282          * thread because its stack is too small, but it can't be killed
 283          * either because the whole server process would exit.  So we just
 284          * join to the first worker thread and exit when it exits.
 285          */
 286         pthread_join(worker_list->tid, NULL);
 287         master_cleanup(0);
 288         return(0);
 289 }