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