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