citadel/server_main.c

   1 /*
   2  * citserver's main() function lives here.
   3  *
   4  * Copyright (c) 1987-2011 by the citadel.org team
   5  *
   6  * This program is open source software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 #include "sysdep.h"
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <signal.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <sys/wait.h>
  31 #include <sys/socket.h>
  32 #include <syslog.h>
  33
  34 #if TIME_WITH_SYS_TIME
  35 # include <sys/time.h>
  36 # include <time.h>
  37 #else
  38 # if HAVE_SYS_TIME_H
  39 #  include <sys/time.h>
  40 # else
  41 #  include <time.h>
  42 # endif
  43 #endif
  44
  45 #include <limits.h>
  46 #include <netinet/in.h>
  47 #include <netdb.h>
  48 #include <sys/un.h>
  49 #include <string.h>
  50 #include <pwd.h>
  51 #include <errno.h>
  52 #include <stdarg.h>
  53 #include <grp.h>
  54 #include <pwd.h>
  55 #ifdef HAVE_SYS_PRCTL_H
  56 #include <sys/prctl.h>
  57 #endif
  58 #include <libcitadel.h>
  59 #include "citadel.h"
  60 #include "server.h"
  61 #include "serv_extensions.h"
  62 #include "sysdep_decls.h"
  63 #include "threads.h"
  64 #include "citserver.h"
  65 #include "support.h"
  66 #include "config.h"
  67 #include "control.h"
  68 #include "database.h"
  69 #include "user_ops.h"
  70 #include "housekeeping.h"
  71 #include "svn_revision.h"
  72 #include "citadel_dirs.h"
  73
  74 #include "context.h"
  75
  76 #include "modules_init.h"
  77 #include "ecrash.h"
  78
  79 #ifdef HAVE_SYS_SELECT_H
  80 #include <sys/select.h>
  81 #endif
  82
  83 #ifndef HAVE_SNPRINTF
  84 #include "snprintf.h"
  85 #endif
  86 const char *CitadelServiceUDS="citadel-UDS";
  87 const char *CitadelServiceTCP="citadel-TCP";
  88
  89
  90
  91 void go_threading(void);
  92
  93 /*
  94  * Here's where it all begins.
  95  */
  96 int main(int argc, char **argv)
  97 {
  98         char facility[32];
  99         int a;                  /* General-purpose variables */
 100         struct passwd pw, *pwp = NULL;
 101         char pwbuf[SIZ];
 102         int drop_root_perms = 1;
 103         size_t size;
 104         int relh=0;
 105         int home=0;
 106         int dbg=0;
 107         int have_log=0;
 108         char relhome[PATH_MAX]="";
 109         char ctdldir[PATH_MAX]=CTDLDIR;
 110         int syslog_facility = LOG_DAEMON;
 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 syslog 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                 }
 140
 141                 /* run in the background if -d was specified */
 142                 else if (!strcmp(argv[a], "-d")) {
 143                         running_as_daemon = 1;
 144                 }
 145
 146                 /* run a few stats if -s was specified */
 147                 else if (!strncmp(argv[a], "-s", 2)) {
 148                         statcount = atoi(&argv[a][2]);
 149                 }
 150
 151                 else if (!strncmp(argv[a], "-h", 2)) {
 152                         relh=argv[a][2]!='/';
 153                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 154                                                                    sizeof ctdl_home_directory);
 155                         else
 156                                 safestrncpy(relhome, &argv[a][2],
 157                                                         sizeof relhome);
 158                         home=1;
 159                 }
 160
 161                 else if (!strncmp(argv[a], "-x", 2)) {
 162                         /* deprecated */
 163                 }
 164
 165                 else if (!strncmp(argv[a], "-t", 2)) {
 166                         if (freopen(&argv[a][2], "w", stderr) != stderr)
 167                         {
 168                                 syslog(LOG_EMERG,
 169                                               "unable to open your trace log [%s]: %s",
 170                                               &argv[a][2],
 171                                               strerror(errno));
 172                                 exit(1);
 173                         }
 174                         have_log = 1;
 175                 }
 176
 177                 else if (!strncmp(argv[a], "-D", 2)) {
 178                         dbg = 1;
 179                 }
 180
 181                 /* -r tells the server not to drop root permissions. don't use
 182                  * this unless you know what you're doing. this should be
 183                  * removed in the next release if it proves unnecessary. */
 184                 else if (!strcmp(argv[a], "-r"))
 185                         drop_root_perms = 0;
 186
 187                 /* any other parameter makes it crash and burn */
 188                 else {
 189                         fprintf(stderr, "citserver: usage: "
 190                                         "citserver "
 191                                         "[-lLogFacility] "
 192                                         "[-d] [-D] [-s] "
 193                                         "[-tTraceFile] "
 194                                         "[-hHomeDir]\n"
 195                         );
 196                         exit(1);
 197                 }
 198
 199         }
 200
 201         openlog("citserver",
 202                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 203                 syslog_facility
 204         );
 205
 206         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 207         /* daemonize, if we were asked to */
 208         if (running_as_daemon) {
 209                 start_daemon(0);
 210                 drop_root_perms = 1;
 211         }
 212
 213 #ifdef HAVE_BACKTRACE
 214         bzero(&params, sizeof(params));
 215         params.filename = file_pid_paniclog;
 216         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 217         params.filep = fopen(file_pid_paniclog, "a+");
 218         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 219         params.dumpAllThreads = TRUE;
 220         params.useBacktraceSymbols = 1;
 221         params.signals[0]=SIGSEGV;
 222         params.signals[1]=SIGILL;
 223         params.signals[2]=SIGBUS;
 224         params.signals[3]=SIGABRT;
 225         eCrash_Init(&params);
 226         eCrash_RegisterThread("MasterThread", 0);
 227 #endif
 228
 229         /* Tell 'em who's in da house */
 230         syslog(LOG_NOTICE, "\n");
 231         syslog(LOG_NOTICE, "\n");
 232         syslog(LOG_NOTICE,
 233                 "*** Citadel server engine v%d.%02d (build %s) ***\n",
 234                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 235         syslog(LOG_NOTICE, "Copyright (C) 1987-2010 by the Citadel development team.\n");
 236         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 237                                         "General Public License.\n");
 238         syslog(LOG_NOTICE, "\n");
 239         syslog(LOG_DEBUG, "Called as: %s\n", argv[0]);
 240         syslog(LOG_INFO, "%s\n", libcitadel_version_string());
 241
 242         /* Load site-specific parameters, and set the ipgm secret */
 243         syslog(LOG_INFO, "Loading citadel.config\n");
 244         get_config();
 245         config.c_ipgm_secret = rand();
 246
 247         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 248         syslog(LOG_INFO, "Acquiring control record\n");
 249         get_control();
 250
 251         put_config();
 252
 253 #ifdef HAVE_RUN_DIR
 254         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 255
 256         if (stat(ctdl_run_dir, &filestats)==-1){
 257 #ifdef HAVE_GETPWUID_R
 258 #ifdef SOLARIS_GETPWUID
 259                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 260 #else // SOLARIS_GETPWUID
 261                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 262 #endif // SOLARIS_GETPWUID
 263 #else // HAVE_GETPWUID_R
 264                 pwp = NULL;
 265 #endif // HAVE_GETPWUID_R
 266
 267                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 268                         syslog(LOG_EMERG,
 269                                       "unable to create run directory [%s]: %s",
 270                                       ctdl_run_dir, strerror(errno));
 271
 272                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 273                         syslog(LOG_EMERG,
 274                                       "unable to set the access rights for [%s]: %s",
 275                                       ctdl_run_dir, strerror(errno));
 276         }
 277
 278
 279 #endif
 280
 281         /* Initialize... */
 282         init_sysdep();
 283
 284         /*
 285          * Do non system dependent startup functions.
 286          */
 287         master_startup();
 288
 289         /*
 290          * Check that the control record is correct and place sensible values if it isn't
 291          */
 292         check_control();
 293
 294         /*
 295          * Run any upgrade entry points
 296          */
 297         syslog(LOG_INFO, "Upgrading modules.\n");
 298         upgrade_modules();
 299
 300 /**
 301  * Load the user for the masterCC or create them if they don't exist
 302  */
 303         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 304         {
 305                 /** User doesn't exist. We can't use create user here as the user number needs to be 0 */
 306                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 307                 CtdlPutUser(&masterCC.user);
 308                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /** Just to be safe */
 309         }
 310
 311         /*
 312          * Bind the server to a Unix-domain socket.
 313          */
 314         CtdlRegisterServiceHook(0,
 315                                 file_citadel_socket,
 316                                 citproto_begin_session,
 317                                 do_command_loop,
 318                                 do_async_loop,
 319                                 CitadelServiceUDS);
 320
 321         /*
 322          * Bind the server to our favorite TCP port (usually 504).
 323          */
 324         CtdlRegisterServiceHook(config.c_port_number,
 325                                 NULL,
 326                                 citproto_begin_session,
 327                                 do_command_loop,
 328                                 do_async_loop,
 329                                 CitadelServiceTCP);
 330
 331
 332
 333
 334         /*
 335          * Load any server-side extensions available here.
 336          */
 337         syslog(LOG_INFO, "Initializing server extensions\n");
 338         size = strlen(ctdl_home_directory) + 9;
 339
 340         initialise_modules(0);
 341
 342
 343
 344         /*
 345          * If we need host auth, start our chkpwd daemon.
 346          */
 347         if (config.c_auth_mode == AUTHMODE_HOST) {
 348                 start_chkpwd_daemon();
 349         }
 350
 351
 352         /*
 353          * check, whether we're fired up another time after a crash.
 354          * if, post an aide message, so the admin has a chance to react.
 355          */
 356         checkcrash ();
 357
 358
 359         /*
 360          * Now that we've bound the sockets, change to the Citadel user id and its
 361          * corresponding group ids
 362          */
 363         if (drop_root_perms) {
 364                 cdb_chmod_data();       /* make sure we own our data files */
 365
 366 #ifdef HAVE_GETPWUID_R
 367 #ifdef SOLARIS_GETPWUID
 368                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 369 #else // SOLARIS_GETPWUID
 370                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 371 #endif // SOLARIS_GETPWUID
 372 #else // HAVE_GETPWUID_R
 373                 pwp = NULL;
 374 #endif // HAVE_GETPWUID_R
 375
 376                 if (pwp == NULL)
 377                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s\n"
 378                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 379                                 strerror(errno));
 380                 else {
 381                         initgroups(pw.pw_name, pw.pw_gid);
 382                         if (setgid(pw.pw_gid))
 383                                 syslog(LOG_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 384                                         strerror(errno));
 385                 }
 386                 syslog(LOG_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 387                 if (setuid(CTDLUID) != 0) {
 388                         syslog(LOG_CRIT, "setuid() failed: %s\n", strerror(errno));
 389                 }
 390 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 391                 prctl(PR_SET_DUMPABLE, 1);
 392 #endif
 393         }
 394
 395         /* We want to check for idle sessions once per minute */
 396         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 397
 398         go_threading();
 399
 400
 401         master_cleanup(exit_signal);
 402         return(0);
 403 }