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, *pwp = NULL;
  78         char pwbuf[SIZ];
  79         int drop_root_perms = 1;
  80         size_t size;
  81         int relh=0;
  82         int home=0;
  83         char relhome[PATH_MAX]="";
  84         char ctdldir[PATH_MAX]=CTDLDIR;
  85 #ifdef HAVE_RUN_DIR
  86         struct stat filestats;
  87 #endif
  88
  89         /* initialize the master context */
  90         InitializeMasterCC();
  91
  92         /* parse command-line arguments */
  93         for (a=1; a<argc; ++a) {
  94
  95                 if (!strncmp(argv[a], "-l", 2)) {
  96                         safestrncpy(facility, &argv[a][2], sizeof(facility));
  97                         syslog_facility = SyslogFacility(facility);
  98                         enable_syslog = 1;
  99                 }
 100
 101                 /* run in the background if -d was specified */
 102                 else if (!strcmp(argv[a], "-d")) {
 103                         running_as_daemon = 1;
 104                 }
 105
 106                 /* -x specifies the desired logging level */
 107                 else if (!strncmp(argv[a], "-x", 2)) {
 108                         verbosity = atoi(&argv[a][2]);
 109                 }
 110
 111                 else if (!strncmp(argv[a], "-h", 2)) {
 112                         relh=argv[a][2]!='/';
 113                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 114                                                                    sizeof ctdl_home_directory);
 115                         else
 116                                 safestrncpy(relhome, &argv[a][2],
 117                                                         sizeof relhome);
 118                         home_specified = 1;
 119                         home=1;
 120                 }
 121
 122                 else if (!strncmp(argv[a], "-t", 2)) {
 123                         freopen(&argv[a][2], "w", stderr);
 124                 }
 125
 126                 else if (!strncmp(argv[a], "-f", 2)) {
 127                         do_defrag = 1;
 128                 }
 129
 130                 /* -r tells the server not to drop root permissions. don't use
 131                  * this unless you know what you're doing. this should be
 132                  * removed in the next release if it proves unnecessary. */
 133                 else if (!strcmp(argv[a], "-r"))
 134                         drop_root_perms = 0;
 135
 136                 /* any other parameter makes it crash and burn */
 137                 else {
 138                         lprintf(CTDL_EMERG,     "citserver: usage: "
 139                                         "citserver "
 140                                         "[-lLogFacility] "
 141                                         "[-d] [-f]"
 142                                         " [-tTraceFile]"
 143                                         " [-xLogLevel] [-hHomeDir]\n");
 144                         exit(1);
 145                 }
 146
 147         }
 148
 149         calc_dirs_n_files(relh, home, relhome, ctdldir);
 150
 151         /* daemonize, if we were asked to */
 152         if (running_as_daemon) {
 153                 start_daemon(0);
 154                 drop_root_perms = 1;
 155         }
 156
 157         /* Initialize the syslogger.  Yes, we are really using 0 as the
 158          * facility, because we are going to bitwise-OR the facility to
 159          * the severity of each message, allowing us to write to other
 160          * facilities when we need to...
 161          */
 162         if (enable_syslog) {
 163                 if (running_as_daemon) {
 164                         openlog("citadel", LOG_NDELAY, 0);
 165                 }
 166                 else {
 167                         openlog("citadel", LOG_PERROR|LOG_NDELAY, 0);
 168                 }
 169                 setlogmask(LOG_UPTO(verbosity));
 170         }
 171
 172         /* Tell 'em who's in da house */
 173         lprintf(CTDL_NOTICE, "\n");
 174         lprintf(CTDL_NOTICE, "\n");
 175         lprintf(CTDL_NOTICE,
 176                 "*** Citadel server engine v%d.%02d ***\n",
 177                 (REV_LEVEL/100), (REV_LEVEL%100));
 178         lprintf(CTDL_NOTICE,
 179                 "Copyright (C) 1987-2007 by the Citadel development team.\n");
 180         lprintf(CTDL_NOTICE,
 181                 "This program is distributed under the terms of the GNU "
 182                 "General Public License.\n");
 183         lprintf(CTDL_NOTICE, "\n");
 184         lprintf(CTDL_DEBUG, "Called as: %s\n", argv[0]);
 185
 186         /* Load site-specific parameters, and set the ipgm secret */
 187         lprintf(CTDL_INFO, "Loading citadel.config\n");
 188         get_config();
 189         config.c_ipgm_secret = rand();
 190         put_config();
 191
 192         lprintf(CTDL_INFO, "Acquiring control record\n");
 193         get_control();
 194
 195 #ifdef HAVE_RUN_DIR
 196         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 197
 198         if (stat(ctdl_run_dir, &filestats)==-1){
 199                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 200                 mkdir(ctdl_run_dir, 0755);
 201                 chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid);
 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                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 246
 247                 if (pwp == NULL)
 248                         lprintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 249                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 250                                 strerror(errno));
 251                 else {
 252                         initgroups(pw.pw_name, pw.pw_gid);
 253                         if (setgid(pw.pw_gid))
 254                                 lprintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 255                                         strerror(errno));
 256                 }
 257                 lprintf(CTDL_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 258                 if (setuid(CTDLUID) != 0) {
 259                         lprintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 260                 }
 261 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 262                 prctl(PR_SET_DUMPABLE, 1);
 263 #endif
 264         }
 265
 266         /* We want to check for idle sessions once per minute */
 267         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 268
 269         /*
 270          * Now create a bunch of worker threads.
 271          */
 272         lprintf(CTDL_DEBUG, "Starting %d worker threads\n",
 273                 config.c_min_workers-1);
 274         begin_critical_section(S_WORKER_LIST);
 275         for (i=0; i<(config.c_min_workers-1); ++i) {
 276                 create_worker();
 277         }
 278         end_critical_section(S_WORKER_LIST);
 279
 280         /* Create the indexer thread. */
 281         create_maintenance_threads();
 282
 283         /* This thread is now useless.  It can't be turned into a worker
 284          * thread because its stack is too small, but it can't be killed
 285          * either because the whole server process would exit.  So we just
 286          * join to the first worker thread and exit when it exits.
 287          */
 288         pthread_join(worker_list->tid, NULL);
 289         master_cleanup(0);
 290         return(0);
 291 }