citadel/server_main.c

   1 /*
   2  * $Id$
   3  *
   4  * citserver's main() function lives here.
   5  *
   6  * Copyright (c) 1987-2010 by the citadel.org team
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "sysdep.h"
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <stdio.h>
  27 #include <fcntl.h>
  28 #include <ctype.h>
  29 #include <signal.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/wait.h>
  33 #include <sys/socket.h>
  34 #include <syslog.h>
  35
  36 #if TIME_WITH_SYS_TIME
  37 # include <sys/time.h>
  38 # include <time.h>
  39 #else
  40 # if HAVE_SYS_TIME_H
  41 #  include <sys/time.h>
  42 # else
  43 #  include <time.h>
  44 # endif
  45 #endif
  46
  47 #include <limits.h>
  48 #include <netinet/in.h>
  49 #include <netdb.h>
  50 #include <sys/un.h>
  51 #include <string.h>
  52 #include <pwd.h>
  53 #include <errno.h>
  54 #include <stdarg.h>
  55 #include <grp.h>
  56 #include <pwd.h>
  57 #ifdef HAVE_SYS_PRCTL_H
  58 #include <sys/prctl.h>
  59 #endif
  60 #include <libcitadel.h>
  61 #include "citadel.h"
  62 #include "server.h"
  63 #include "serv_extensions.h"
  64 #include "sysdep_decls.h"
  65 #include "threads.h"
  66 #include "citserver.h"
  67 #include "support.h"
  68 #include "config.h"
  69 #include "control.h"
  70 #include "database.h"
  71 #include "user_ops.h"
  72 #include "housekeeping.h"
  73 #include "svn_revision.h"
  74 #include "citadel_dirs.h"
  75
  76 #include "context.h"
  77
  78 #include "modules_init.h"
  79 #include "ecrash.h"
  80
  81 #ifdef HAVE_SYS_SELECT_H
  82 #include <sys/select.h>
  83 #endif
  84
  85 #ifndef HAVE_SNPRINTF
  86 #include "snprintf.h"
  87 #endif
  88 const char *CitadelServiceUDS="citadel-UDS";
  89 const char *CitadelServiceTCP="citadel-TCP";
  90
  91
  92
  93 void go_threading(void);
  94
  95 /*
  96  * Here's where it all begins.
  97  */
  98 int main(int argc, char **argv)
  99 {
 100         char facility[32];
 101         int a;                  /* General-purpose variables */
 102         struct passwd pw, *pwp = NULL;
 103         char pwbuf[SIZ];
 104         int drop_root_perms = 1;
 105         size_t size;
 106         int relh=0;
 107         int home=0;
 108         int dbg=0;
 109         char relhome[PATH_MAX]="";
 110         char ctdldir[PATH_MAX]=CTDLDIR;
 111 #ifdef HAVE_RUN_DIR
 112         struct stat filestats;
 113 #endif
 114 #ifdef HAVE_BACKTRACE
 115         eCrashParameters params;
 116 //      eCrashSymbolTable symbol_table;
 117 #endif
 118
 119 #ifdef HAVE_GC
 120         GC_INIT();
 121         GC_find_leak = 1;
 122 #endif
 123
 124
 125         /* initialise semaphores here. Patch by Matt and davew
 126          * its called here as they are needed by CtdlLogPrintf for thread safety
 127          */
 128         InitialiseSemaphores();
 129
 130         /* initialize the master context */
 131         InitializeMasterCC();
 132
 133         /* parse command-line arguments */
 134         for (a=1; a<argc; ++a) {
 135
 136                 if (!strncmp(argv[a], "-l", 2)) {
 137                         safestrncpy(facility, &argv[a][2], sizeof(facility));
 138                         syslog_facility = SyslogFacility(facility);
 139                         enable_syslog = 1;
 140                 }
 141
 142                 /* run in the background if -d was specified */
 143                 else if (!strcmp(argv[a], "-d")) {
 144                         running_as_daemon = 1;
 145                 }
 146
 147                 /* run a few stats if -s was specified */
 148                 else if (!strncmp(argv[a], "-s", 2)) {
 149                         statcount = atoi(&argv[a][2]);
 150                 }
 151
 152                 /* -x specifies the desired logging level */
 153                 else if (!strncmp(argv[a], "-x", 2)) {
 154                         verbosity = atoi(&argv[a][2]);
 155                 }
 156
 157                 else if (!strncmp(argv[a], "-h", 2)) {
 158                         relh=argv[a][2]!='/';
 159                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 160                                                                    sizeof ctdl_home_directory);
 161                         else
 162                                 safestrncpy(relhome, &argv[a][2],
 163                                                         sizeof relhome);
 164                         home=1;
 165                 }
 166
 167                 else if (!strncmp(argv[a], "-t", 2)) {
 168                         if (freopen(&argv[a][2], "w", stderr) != stderr)
 169                         {
 170                                 CtdlLogPrintf(CTDL_EMERG,
 171                                               "unable to open your trace log [%s]: %s",
 172                                               &argv[a][2],
 173                                               strerror(errno));
 174                                 exit(1);
 175                         }
 176                 }
 177
 178                 else if (!strncmp(argv[a], "-D", 2)) {
 179                         dbg = 1;
 180                 }
 181
 182                 /* -r tells the server not to drop root permissions. don't use
 183                  * this unless you know what you're doing. this should be
 184                  * removed in the next release if it proves unnecessary. */
 185                 else if (!strcmp(argv[a], "-r"))
 186                         drop_root_perms = 0;
 187
 188                 /* any other parameter makes it crash and burn */
 189                 else {
 190                         CtdlLogPrintf(CTDL_EMERG,       "citserver: usage: "
 191                                         "citserver "
 192                                         "[-lLogFacility] "
 193                                         "[-d] [-D] [-s]"
 194                                         " [-tTraceFile]"
 195                                         " [-xLogLevel] [-hHomeDir]\n");
 196                         exit(1);
 197                 }
 198
 199         }
 200
 201         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 202         /* daemonize, if we were asked to */
 203         if (running_as_daemon) {
 204                 start_daemon(0);
 205                 drop_root_perms = 1;
 206         }
 207
 208 #ifdef HAVE_BACKTRACE
 209         bzero(&params, sizeof(params));
 210         params.filename = file_pid_paniclog;
 211         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 212         params.filep = fopen(file_pid_paniclog, "a+");
 213         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 214         params.dumpAllThreads = TRUE;
 215         params.useBacktraceSymbols = 1;
 216         params.signals[0]=SIGSEGV;
 217         params.signals[1]=SIGILL;
 218         params.signals[2]=SIGBUS;
 219         params.signals[3]=SIGABRT;
 220         eCrash_Init(&params);
 221         eCrash_RegisterThread("MasterThread", 0);
 222 #endif
 223
 224         /* Initialize the syslogger.  Yes, we are really using 0 as the
 225          * facility, because we are going to bitwise-OR the facility to
 226          * the severity of each message, allowing us to write to other
 227          * facilities when we need to...
 228          */
 229         if (enable_syslog) {
 230                 openlog("citadel", LOG_NDELAY, 0);
 231                 setlogmask(LOG_UPTO(verbosity));
 232         }
 233
 234         /* Tell 'em who's in da house */
 235         CtdlLogPrintf(CTDL_NOTICE, "\n");
 236         CtdlLogPrintf(CTDL_NOTICE, "\n");
 237         CtdlLogPrintf(CTDL_NOTICE,
 238                 "*** Citadel server engine v%d.%02d (build %s) ***\n",
 239                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 240         CtdlLogPrintf(CTDL_NOTICE, "Copyright (C) 1987-2010 by the Citadel development team.\n");
 241         CtdlLogPrintf(CTDL_NOTICE, "This program is distributed under the terms of the GNU "
 242                                         "General Public License.\n");
 243         CtdlLogPrintf(CTDL_NOTICE, "\n");
 244         CtdlLogPrintf(CTDL_DEBUG, "Called as: %s\n", argv[0]);
 245         CtdlLogPrintf(CTDL_INFO, "%s\n", libcitadel_version_string());
 246
 247         /* Load site-specific parameters, and set the ipgm secret */
 248         CtdlLogPrintf(CTDL_INFO, "Loading citadel.config\n");
 249         get_config();
 250         config.c_ipgm_secret = rand();
 251
 252         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 253         CtdlLogPrintf(CTDL_INFO, "Acquiring control record\n");
 254         get_control();
 255
 256         put_config();
 257
 258 #ifdef HAVE_RUN_DIR
 259         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 260
 261         if (stat(ctdl_run_dir, &filestats)==-1){
 262 #ifdef HAVE_GETPWUID_R
 263 #ifdef SOLARIS_GETPWUID
 264                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 265 #else // SOLARIS_GETPWUID
 266                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 267 #endif // SOLARIS_GETPWUID
 268 #else // HAVE_GETPWUID_R
 269                 pwp = NULL;
 270 #endif // HAVE_GETPWUID_R
 271
 272                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 273                         CtdlLogPrintf(CTDL_EMERG,
 274                                       "unable to create run directory [%s]: %s",
 275                                       ctdl_run_dir, strerror(errno));
 276
 277                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 278                         CtdlLogPrintf(CTDL_EMERG,
 279                                       "unable to set the access rights for [%s]: %s",
 280                                       ctdl_run_dir, strerror(errno));
 281         }
 282
 283
 284 #endif
 285
 286         /* Initialize... */
 287         init_sysdep();
 288
 289         /*
 290          * Do non system dependent startup functions.
 291          */
 292         master_startup();
 293
 294         /*
 295          * Check that the control record is correct and place sensible values if it isn't
 296          */
 297         check_control();
 298
 299         /*
 300          * Run any upgrade entry points
 301          */
 302         CtdlLogPrintf(CTDL_INFO, "Upgrading modules.\n");
 303         upgrade_modules();
 304
 305 /**
 306  * Load the user for the masterCC or create them if they don't exist
 307  */
 308         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 309         {
 310                 /** User doesn't exist. We can't use create user here as the user number needs to be 0 */
 311                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 312                 CtdlPutUser(&masterCC.user);
 313                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /** Just to be safe */
 314         }
 315
 316         /*
 317          * Bind the server to a Unix-domain socket.
 318          */
 319         CtdlRegisterServiceHook(0,
 320                                 file_citadel_socket,
 321                                 citproto_begin_session,
 322                                 do_command_loop,
 323                                 do_async_loop,
 324                                 CitadelServiceUDS);
 325
 326         /*
 327          * Bind the server to our favorite TCP port (usually 504).
 328          */
 329         CtdlRegisterServiceHook(config.c_port_number,
 330                                 NULL,
 331                                 citproto_begin_session,
 332                                 do_command_loop,
 333                                 do_async_loop,
 334                                 CitadelServiceTCP);
 335
 336
 337
 338
 339         /*
 340          * Load any server-side extensions available here.
 341          */
 342         CtdlLogPrintf(CTDL_INFO, "Initializing server extensions\n");
 343         size = strlen(ctdl_home_directory) + 9;
 344
 345         initialise_modules(0);
 346
 347
 348
 349         /*
 350          * If we need host auth, start our chkpwd daemon.
 351          */
 352         if (config.c_auth_mode == AUTHMODE_HOST) {
 353                 start_chkpwd_daemon();
 354         }
 355
 356
 357         /*
 358          * check, whether we're fired up another time after a crash.
 359          * if, post an aide message, so the admin has a chance to react.
 360          */
 361         checkcrash ();
 362
 363
 364         /*
 365          * Now that we've bound the sockets, change to the Citadel user id and its
 366          * corresponding group ids
 367          */
 368         if (drop_root_perms) {
 369                 cdb_chmod_data();       /* make sure we own our data files */
 370
 371 #ifdef HAVE_GETPWUID_R
 372 #ifdef SOLARIS_GETPWUID
 373                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 374 #else // SOLARIS_GETPWUID
 375                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 376 #endif // SOLARIS_GETPWUID
 377 #else // HAVE_GETPWUID_R
 378                 pwp = NULL;
 379 #endif // HAVE_GETPWUID_R
 380
 381                 if (pwp == NULL)
 382                         CtdlLogPrintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 383                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 384                                 strerror(errno));
 385                 else {
 386                         initgroups(pw.pw_name, pw.pw_gid);
 387                         if (setgid(pw.pw_gid))
 388                                 CtdlLogPrintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 389                                         strerror(errno));
 390                 }
 391                 CtdlLogPrintf(CTDL_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 392                 if (setuid(CTDLUID) != 0) {
 393                         CtdlLogPrintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 394                 }
 395 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 396                 prctl(PR_SET_DUMPABLE, 1);
 397 #endif
 398         }
 399
 400         /* We want to check for idle sessions once per minute */
 401         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 402
 403         go_threading();
 404
 405
 406         master_cleanup(exit_signal);
 407         return(0);
 408 }