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 "user_ops.h"
  57 #include "housekeeping.h"
  58 #include "tools.h"
  59 #include "citadel_dirs.c"
  60
  61 #include "modules_init.h"
  62 #include "ecrash.h"
  63
  64 #ifdef HAVE_SYS_SELECT_H
  65 #include <sys/select.h>
  66 #endif
  67
  68 #ifndef HAVE_SNPRINTF
  69 #include "snprintf.h"
  70 #endif
  71 const char *CitadelServiceUDS="citadel-UDS";
  72 const char *CitadelServiceTCP="citadel-TCP";
  73
  74 /*
  75  * Here's where it all begins.
  76  */
  77 int main(int argc, char **argv)
  78 {
  79         char facility[32];
  80         int a, i;                       /* General-purpose variables */
  81         struct passwd pw, *pwp = NULL;
  82         char pwbuf[SIZ];
  83         int drop_root_perms = 1;
  84         size_t size;
  85         int relh=0;
  86         int home=0;
  87         char relhome[PATH_MAX]="";
  88         char ctdldir[PATH_MAX]=CTDLDIR;
  89 #ifdef HAVE_RUN_DIR
  90         struct stat filestats;
  91 #endif
  92 #ifdef HAVE_BACKTRACE
  93         eCrashParameters params;
  94 //      eCrashSymbolTable symbol_table;
  95 #endif
  96         /* initialise semaphores here. Patch by Matt and davew
  97          * its called here as they are needed by lprintf for thread safety
  98          */
  99         CtdlInitBase64Table();
 100         InitialiseSemaphores();
 101
 102         /* initialize the master context */
 103         InitializeMasterCC();
 104
 105         /* parse command-line arguments */
 106         for (a=1; a<argc; ++a) {
 107
 108                 if (!strncmp(argv[a], "-l", 2)) {
 109                         safestrncpy(facility, &argv[a][2], sizeof(facility));
 110                         syslog_facility = SyslogFacility(facility);
 111                         enable_syslog = 1;
 112                 }
 113
 114                 /* run in the background if -d was specified */
 115                 else if (!strcmp(argv[a], "-d")) {
 116                         running_as_daemon = 1;
 117                 }
 118
 119                 /* -x specifies the desired logging level */
 120                 else if (!strncmp(argv[a], "-x", 2)) {
 121                         verbosity = atoi(&argv[a][2]);
 122                 }
 123
 124                 else if (!strncmp(argv[a], "-h", 2)) {
 125                         relh=argv[a][2]!='/';
 126                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 127                                                                    sizeof ctdl_home_directory);
 128                         else
 129                                 safestrncpy(relhome, &argv[a][2],
 130                                                         sizeof relhome);
 131                         home_specified = 1;
 132                         home=1;
 133                 }
 134
 135                 else if (!strncmp(argv[a], "-t", 2)) {
 136                         freopen(&argv[a][2], "w", stderr);
 137                 }
 138
 139                 else if (!strncmp(argv[a], "-f", 2)) {
 140                         do_defrag = 1;
 141                 }
 142
 143                 /* -r tells the server not to drop root permissions. don't use
 144                  * this unless you know what you're doing. this should be
 145                  * removed in the next release if it proves unnecessary. */
 146                 else if (!strcmp(argv[a], "-r"))
 147                         drop_root_perms = 0;
 148
 149                 /* any other parameter makes it crash and burn */
 150                 else {
 151                         lprintf(CTDL_EMERG,     "citserver: usage: "
 152                                         "citserver "
 153                                         "[-lLogFacility] "
 154                                         "[-d] [-f]"
 155                                         " [-tTraceFile]"
 156                                         " [-xLogLevel] [-hHomeDir]\n");
 157                         exit(1);
 158                 }
 159
 160         }
 161
 162         calc_dirs_n_files(relh, home, relhome, ctdldir);
 163         /* daemonize, if we were asked to */
 164         if (running_as_daemon) {
 165                 start_daemon(0);
 166                 drop_root_perms = 1;
 167         }
 168
 169 #ifdef HAVE_BACKTRACE
 170         bzero(&params, sizeof(params));
 171         params.filename = file_pid_paniclog;
 172         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 173         params.filep = fopen(file_pid_paniclog, "a+");
 174         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 175         params.dumpAllThreads = TRUE;
 176         params.useBacktraceSymbols = 1;
 177 ///     BuildSymbolTable(&symbol_table);
 178 //      params.symbolTable = &symbol_table;
 179         params.signals[0]=SIGSEGV;
 180         params.signals[1]=SIGILL;
 181         params.signals[2]=SIGBUS;
 182         params.signals[3]=SIGABRT;
 183
 184         eCrash_Init(&params);
 185
 186         eCrash_RegisterThread("MasterThread", 0);
 187
 188 ///     signal(SIGSEGV, cit_panic_backtrace);
 189 #endif
 190         /* Initialize the syslogger.  Yes, we are really using 0 as the
 191          * facility, because we are going to bitwise-OR the facility to
 192          * the severity of each message, allowing us to write to other
 193          * facilities when we need to...
 194          */
 195         if (enable_syslog) {
 196                 openlog("citadel", LOG_NDELAY, 0);
 197                 setlogmask(LOG_UPTO(verbosity));
 198         }
 199
 200         /* Tell 'em who's in da house */
 201         lprintf(CTDL_NOTICE, "\n");
 202         lprintf(CTDL_NOTICE, "\n");
 203         lprintf(CTDL_NOTICE,
 204                 "*** Citadel server engine v%d.%02d ***\n",
 205                 (REV_LEVEL/100), (REV_LEVEL%100));
 206         lprintf(CTDL_NOTICE,
 207                 "Copyright (C) 1987-2007 by the Citadel development team.\n");
 208         lprintf(CTDL_NOTICE,
 209                 "This program is distributed under the terms of the GNU "
 210                 "General Public License.\n");
 211         lprintf(CTDL_NOTICE, "\n");
 212         lprintf(CTDL_DEBUG, "Called as: %s\n", argv[0]);
 213
 214         /* Load site-specific parameters, and set the ipgm secret */
 215         lprintf(CTDL_INFO, "Loading citadel.config\n");
 216         get_config();
 217         config.c_ipgm_secret = rand();
 218         put_config();
 219
 220 #ifdef HAVE_RUN_DIR
 221         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 222
 223         if (stat(ctdl_run_dir, &filestats)==-1){
 224 #ifdef SOLARIS_GETPWUID
 225                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 226 #else
 227                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 228 #endif
 229                 mkdir(ctdl_run_dir, 0755);
 230                 chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid);
 231         }
 232
 233
 234 #endif
 235
 236         /* Initialize... */
 237         init_sysdep();
 238
 239         /*
 240          * Do non system dependent startup functions.
 241          */
 242         master_startup();
 243
 244         lprintf(CTDL_INFO, "Acquiring control record\n");
 245         get_control();
 246
 247         /*
 248          * Bind the server to a Unix-domain socket.
 249          */
 250         CtdlRegisterServiceHook(0,
 251                                 file_citadel_socket,
 252                                 citproto_begin_session,
 253                                 do_command_loop,
 254                                 do_async_loop,
 255                                 CitadelServiceUDS);
 256
 257         /*
 258          * Bind the server to our favorite TCP port (usually 504).
 259          */
 260         CtdlRegisterServiceHook(config.c_port_number,
 261                                 NULL,
 262                                 citproto_begin_session,
 263                                 do_command_loop,
 264                                 do_async_loop,
 265                                 CitadelServiceTCP);
 266
 267         /*
 268          * Load any server-side extensions available here.
 269          */
 270         lprintf(CTDL_INFO, "Initializing server extensions\n");
 271         size = strlen(ctdl_home_directory) + 9;
 272
 273 /*
 274         initialize_server_extensions();
 275 */
 276
 277         initialise_modules();
 278
 279
 280
 281         /*
 282          * If we need host auth, start our chkpwd daemon.
 283          */
 284         if (config.c_auth_mode == 1) {
 285                 start_chkpwd_daemon();
 286         }
 287
 288         /*
 289          * Now that we've bound the sockets, change to the Citadel user id and its
 290          * corresponding group ids
 291          */
 292         if (drop_root_perms) {
 293                 cdb_chmod_data();       /* make sure we own our data files */
 294
 295 #ifdef SOLARIS_GETPWUID
 296                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 297 #else
 298                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 299 #endif
 300                 if (pwp == NULL)
 301                         lprintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 302                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 303                                 strerror(errno));
 304                 else {
 305                         initgroups(pw.pw_name, pw.pw_gid);
 306                         if (setgid(pw.pw_gid))
 307                                 lprintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 308                                         strerror(errno));
 309                 }
 310                 lprintf(CTDL_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 311                 if (setuid(CTDLUID) != 0) {
 312                         lprintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 313                 }
 314 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 315                 prctl(PR_SET_DUMPABLE, 1);
 316 #endif
 317         }
 318
 319         /* We want to check for idle sessions once per minute */
 320         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 321
 322         /*
 323          * Now create a bunch of worker threads.
 324          */
 325         lprintf(CTDL_DEBUG, "Starting %d worker threads\n",
 326                 config.c_min_workers-1);
 327         begin_critical_section(S_WORKER_LIST);
 328         for (i=0; i<(config.c_min_workers-1); ++i) {
 329                 create_worker();
 330         }
 331         end_critical_section(S_WORKER_LIST);
 332
 333         /* Create the maintenance threads. */
 334         create_maintenance_threads();
 335
 336         /* This thread is now useless.  It can't be turned into a worker
 337          * thread because its stack is too small, but it can't be killed
 338          * either because the whole server process would exit.  So we just
 339          * join to the first worker thread and exit when it exits.
 340          */
 341         pthread_join(worker_list->tid, NULL);
 342         master_cleanup(0);
 343         return(0);
 344 }