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 "database.h"
  55 #include "housekeeping.h"
  56 #include "tools.h"
  57 #include "citadel_dirs.c"
  58
  59 #ifdef HAVE_SYS_SELECT_H
  60 #include <sys/select.h>
  61 #endif
  62
  63 #ifndef HAVE_SNPRINTF
  64 #include "snprintf.h"
  65 #endif
  66
  67 int running_as_daemon = 0;
  68
  69 /*
  70  * Here's where it all begins.
  71  */
  72 int main(int argc, char **argv)
  73 {
  74         char facility[32];
  75         int a, i;                       /* General-purpose variables */
  76         struct passwd *pw;
  77         int drop_root_perms = 1;
  78         size_t size;
  79         int relh=0;
  80         int home=0;
  81         char relhome[PATH_MAX]="";
  82         char ctdldir[PATH_MAX]=CTDLDIR;
  83 #ifdef HAVE_RUN_DIR
  84         struct stat filestats;
  85 #endif
  86
  87         /* initialize the master context */
  88         InitializeMasterCC();
  89
  90         /* parse command-line arguments */
  91         for (a=1; a<argc; ++a) {
  92
  93                 if (!strncmp(argv[a], "-l", 2)) {
  94                         safestrncpy(facility, &argv[a][2], sizeof(facility));
  95                         syslog_facility = SyslogFacility(facility);
  96                         enable_syslog = 1;
  97                 }
  98
  99                 /* run in the background if -d was specified */
 100                 else if (!strcmp(argv[a], "-d")) {
 101                         running_as_daemon = 1;
 102                 }
 103
 104                 /* -x specifies the desired logging level */
 105                 else if (!strncmp(argv[a], "-x", 2)) {
 106                         verbosity = atoi(&argv[a][2]);
 107                 }
 108
 109                 else if (!strncmp(argv[a], "-h", 2)) {
 110                         relh=argv[a][2]!='/';
 111                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 112                                                                    sizeof ctdl_home_directory);
 113                         else
 114                                 safestrncpy(relhome, &argv[a][2],
 115                                                         sizeof relhome);
 116                         home_specified = 1;
 117                         home=1;
 118                 }
 119
 120                 else if (!strncmp(argv[a], "-t", 2)) {
 121                         freopen(&argv[a][2], "w", stderr);
 122                 }
 123
 124                 else if (!strncmp(argv[a], "-f", 2)) {
 125                         do_defrag = 1;
 126                 }
 127
 128                 /* -r tells the server not to drop root permissions. don't use
 129                  * this unless you know what you're doing. this should be
 130                  * removed in the next release if it proves unnecessary. */
 131                 else if (!strcmp(argv[a], "-r"))
 132                         drop_root_perms = 0;
 133
 134                 /* any other parameter makes it crash and burn */
 135                 else {
 136                         lprintf(CTDL_EMERG,     "citserver: usage: "
 137                                         "citserver "
 138                                         "[-lLogFacility] "
 139                                         "[-d] [-f]"
 140                                         " [-tTraceFile]"
 141                                         " [-xLogLevel] [-hHomeDir]\n");
 142                         exit(1);
 143                 }
 144
 145         }
 146
 147         calc_dirs_n_files(relh, home, relhome, ctdldir);
 148
 149         /* daemonize, if we were asked to */
 150         if (running_as_daemon) {
 151                 start_daemon(0);
 152                 drop_root_perms = 1;
 153         }
 154
 155         /* Initialize the syslogger.  Yes, we are really using 0 as the
 156          * facility, because we are going to bitwise-OR the facility to
 157          * the severity of each message, allowing us to write to other
 158          * facilities when we need to...
 159          */
 160         if (enable_syslog) {
 161                 if (running_as_daemon) {
 162                         openlog("citadel", LOG_NDELAY, 0);
 163                 }
 164                 else {
 165                         openlog("citadel", LOG_PERROR|LOG_NDELAY, 0);
 166                 }
 167                 setlogmask(LOG_UPTO(verbosity));
 168         }
 169
 170         /* Tell 'em who's in da house */
 171         lprintf(CTDL_NOTICE, "\n");
 172         lprintf(CTDL_NOTICE, "\n");
 173         lprintf(CTDL_NOTICE,
 174                 "*** Citadel server engine v%d.%02d ***\n",
 175                 (REV_LEVEL/100), (REV_LEVEL%100));
 176         lprintf(CTDL_NOTICE,
 177                 "Copyright (C) 1987-2005 by the Citadel development team.\n");
 178         lprintf(CTDL_NOTICE,
 179                 "This program is distributed under the terms of the GNU "
 180                 "General Public License.\n");
 181         lprintf(CTDL_NOTICE, "\n");
 182         lprintf(CTDL_DEBUG, "Called as: %s\n", argv[0]);
 183
 184         /* Load site-specific parameters, and set the ipgm secret */
 185         lprintf(CTDL_INFO, "Loading citadel.config\n");
 186         get_config();
 187         config.c_ipgm_secret = rand();
 188         put_config();
 189
 190 #ifdef HAVE_RUN_DIR
 191         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 192
 193         if (stat(ctdl_run_dir, &filestats)==-1){
 194                 pw=getpwuid(config.c_ctdluid);
 195                 mkdir(ctdl_run_dir, 0755);
 196                 chown(ctdl_run_dir, config.c_ctdluid, (pw==NULL)?-1:pw->pw_gid);
 197
 198         }
 199
 200
 201 #endif
 202
 203         /* Initialize... */
 204         init_sysdep();
 205
 206         /*
 207          * Do non system dependent startup functions.
 208          */
 209         master_startup();
 210
 211         /*
 212          * Bind the server to a Unix-domain socket.
 213          */
 214         CtdlRegisterServiceHook(0,
 215                                                         file_citadel_socket,
 216                                                         citproto_begin_session,
 217                                                         do_command_loop,
 218                                                         do_async_loop);
 219
 220         /*
 221          * Bind the server to our favorite TCP port (usually 504).
 222          */
 223         CtdlRegisterServiceHook(config.c_port_number,
 224                                 NULL,
 225                                 citproto_begin_session,
 226                                 do_command_loop,
 227                                 do_async_loop);
 228
 229         /*
 230          * Load any server-side extensions available here.
 231          */
 232         lprintf(CTDL_INFO, "Initializing server extensions\n");
 233         size = strlen(ctdl_home_directory) + 9;
 234         initialize_server_extensions();
 235
 236         /*
 237          * Now that we've bound the sockets, change to the Citadel user id and its
 238          * corresponding group ids
 239          */
 240         if (drop_root_perms) {
 241                 if ((pw = getpwuid(CTDLUID)) == NULL)
 242                         lprintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 243                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 244                                 strerror(errno));
 245                 else {
 246                         initgroups(pw->pw_name, pw->pw_gid);
 247                         if (setgid(pw->pw_gid))
 248                                 lprintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw->pw_gid,
 249                                         strerror(errno));
 250                 }
 251                 lprintf(CTDL_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 252                 if (setuid(CTDLUID) != 0) {
 253                         lprintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 254                 }
 255 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 256                 prctl(PR_SET_DUMPABLE, 1);
 257 #endif
 258         }
 259
 260         /* We want to check for idle sessions once per minute */
 261         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 262
 263         /*
 264          * Now create a bunch of worker threads.
 265          */
 266         lprintf(CTDL_DEBUG, "Starting %d worker threads\n",
 267                 config.c_min_workers-1);
 268         begin_critical_section(S_WORKER_LIST);
 269         for (i=0; i<(config.c_min_workers-1); ++i) {
 270                 create_worker();
 271         }
 272         end_critical_section(S_WORKER_LIST);
 273
 274         /* Create the indexer thread. */
 275         create_maintenance_threads();
 276
 277         /* This thread is now useless.  It can't be turned into a worker
 278          * thread because its stack is too small, but it can't be killed
 279          * either because the whole server process would exit.  So we just
 280          * join to the first worker thread and exit when it exits.
 281          */
 282         pthread_join(worker_list->tid, NULL);
 283         master_cleanup(0);
 284         return(0);
 285 }