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         int relh=0;
 104         int home=0;
 105         int dbg=0;
 106         char relhome[PATH_MAX]="";
 107         char ctdldir[PATH_MAX]=CTDLDIR;
 108         int syslog_facility = LOG_DAEMON;
 109 #ifdef HAVE_RUN_DIR
 110         struct stat filestats;
 111 #endif
 112 #ifdef HAVE_BACKTRACE
 113         eCrashParameters params;
 114 //      eCrashSymbolTable symbol_table;
 115 #endif
 116
 117         /* initialize the master context */
 118         InitializeMasterCC();
 119         InitializeMasterTSD();
 120
 121         /* parse command-line arguments */
 122         for (a=1; a<argc; ++a) {
 123
 124                 if (!strncmp(argv[a], "-l", 2)) {
 125                         safestrncpy(facility, &argv[a][2], sizeof(facility));
 126                         syslog_facility = SyslogFacility(facility);
 127                 }
 128
 129                 /* run in the background if -d was specified */
 130                 else if (!strcmp(argv[a], "-d")) {
 131                         running_as_daemon = 1;
 132                 }
 133
 134                 else if (!strncmp(argv[a], "-h", 2)) {
 135                         relh=argv[a][2]!='/';
 136                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 137                                                                    sizeof ctdl_home_directory);
 138                         else
 139                                 safestrncpy(relhome, &argv[a][2],
 140                                                         sizeof relhome);
 141                         home=1;
 142                 }
 143
 144                 else if (!strncmp(argv[a], "-x", 2)) {
 145                         /* deprecated */
 146                 }
 147
 148                 else if (!strncmp(argv[a], "-t", 2)) {
 149                         if (freopen(&argv[a][2], "w", stderr) != stderr)
 150                         {
 151                                 syslog(LOG_EMERG,
 152                                               "unable to open your trace log [%s]: %s",
 153                                               &argv[a][2],
 154                                               strerror(errno));
 155                                 exit(1);
 156                         }
 157                 }
 158
 159                 else if (!strncmp(argv[a], "-D", 2)) {
 160                         dbg = 1;
 161                 }
 162
 163                 /* -r tells the server not to drop root permissions. don't use
 164                  * this unless you know what you're doing. this should be
 165                  * removed in the next release if it proves unnecessary. */
 166                 else if (!strcmp(argv[a], "-r"))
 167                         drop_root_perms = 0;
 168
 169                 /* any other parameter makes it crash and burn */
 170                 else {
 171                         fprintf(stderr, "citserver: usage: "
 172                                         "citserver "
 173                                         "[-lLogFacility] "
 174                                         "[-d] [-D] [-s] "
 175                                         "[-tTraceFile] "
 176                                         "[-hHomeDir]\n"
 177                         );
 178                         exit(1);
 179                 }
 180
 181         }
 182
 183         openlog("citserver",
 184                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 185                 syslog_facility
 186         );
 187
 188         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 189         /* daemonize, if we were asked to */
 190         if (running_as_daemon) {
 191                 start_daemon(0);
 192                 drop_root_perms = 1;
 193         }
 194
 195 #ifdef HAVE_BACKTRACE
 196         bzero(&params, sizeof(params));
 197         params.filename = file_pid_paniclog;
 198         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 199         params.filep = fopen(file_pid_paniclog, "a+");
 200         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 201         params.dumpAllThreads = TRUE;
 202         params.useBacktraceSymbols = 1;
 203         params.signals[0]=SIGSEGV;
 204         params.signals[1]=SIGILL;
 205         params.signals[2]=SIGBUS;
 206         params.signals[3]=SIGABRT;
 207         eCrash_Init(&params);
 208         eCrash_RegisterThread("MasterThread", 0);
 209 #endif
 210
 211         /* Tell 'em who's in da house */
 212         syslog(LOG_NOTICE, " ");
 213         syslog(LOG_NOTICE, " ");
 214         syslog(LOG_NOTICE,
 215                 "*** Citadel server engine v%d.%02d (build %s) ***",
 216                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 217         syslog(LOG_NOTICE, "Copyright (C) 1987-2011 by the Citadel development team.");
 218         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 219                                         "General Public License.");
 220         syslog(LOG_NOTICE, " ");
 221         syslog(LOG_DEBUG, "Called as: %s", argv[0]);
 222         syslog(LOG_INFO, "%s", libcitadel_version_string());
 223
 224         /* Load site-specific parameters, and set the ipgm secret */
 225         syslog(LOG_INFO, "Loading citadel.config");
 226         get_config();
 227         config.c_ipgm_secret = rand();
 228
 229         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 230         syslog(LOG_INFO, "Acquiring control record");
 231         get_control();
 232
 233         put_config();
 234
 235 #ifdef HAVE_RUN_DIR
 236         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 237
 238         if (stat(ctdl_run_dir, &filestats)==-1){
 239 #ifdef HAVE_GETPWUID_R
 240 #ifdef SOLARIS_GETPWUID
 241                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 242 #else // SOLARIS_GETPWUID
 243                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 244 #endif // SOLARIS_GETPWUID
 245 #else // HAVE_GETPWUID_R
 246                 pwp = NULL;
 247 #endif // HAVE_GETPWUID_R
 248
 249                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 250                         syslog(LOG_EMERG,
 251                                       "unable to create run directory [%s]: %s",
 252                                       ctdl_run_dir, strerror(errno));
 253
 254                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 255                         syslog(LOG_EMERG,
 256                                       "unable to set the access rights for [%s]: %s",
 257                                       ctdl_run_dir, strerror(errno));
 258         }
 259
 260
 261 #endif
 262
 263         /* Initialize... */
 264         init_sysdep();
 265
 266         /*
 267          * Do non system dependent startup functions.
 268          */
 269         master_startup();
 270
 271         /*
 272          * Check that the control record is correct and place sensible values if it isn't
 273          */
 274         check_control();
 275
 276         /*
 277          * Run any upgrade entry points
 278          */
 279         syslog(LOG_INFO, "Upgrading modules.");
 280         upgrade_modules();
 281
 282 /*
 283  * Load the user for the masterCC or create them if they don't exist
 284  */
 285         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 286         {
 287                 /* User doesn't exist. We can't use create user here as the user number needs to be 0 */
 288                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 289                 CtdlPutUser(&masterCC.user);
 290                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /* Just to be safe */
 291         }
 292
 293         /*
 294          * Bind the server to a Unix-domain socket.
 295          */
 296         CtdlRegisterServiceHook(0,
 297                                 file_citadel_socket,
 298                                 citproto_begin_session,
 299                                 do_command_loop,
 300                                 do_async_loop,
 301                                 CitadelServiceUDS);
 302
 303         /*
 304          * Bind the server to our favorite TCP port (usually 504).
 305          */
 306         CtdlRegisterServiceHook(config.c_port_number,
 307                                 NULL,
 308                                 citproto_begin_session,
 309                                 do_command_loop,
 310                                 do_async_loop,
 311                                 CitadelServiceTCP);
 312
 313
 314
 315
 316         /*
 317          * Load any server-side extensions available here.
 318          */
 319         syslog(LOG_INFO, "Initializing server extensions\n");
 320
 321         initialise_modules(0);
 322
 323         /*
 324          * If we need host auth, start our chkpwd daemon.
 325          */
 326         if (config.c_auth_mode == AUTHMODE_HOST) {
 327                 start_chkpwd_daemon();
 328         }
 329
 330
 331         /*
 332          * check, whether we're fired up another time after a crash.
 333          * if, post an aide message, so the admin has a chance to react.
 334          */
 335         checkcrash ();
 336
 337
 338         /*
 339          * Now that we've bound the sockets, change to the Citadel user id and its
 340          * corresponding group ids
 341          */
 342         if (drop_root_perms) {
 343                 cdb_chmod_data();       /* make sure we own our data files */
 344
 345 #ifdef HAVE_GETPWUID_R
 346 #ifdef SOLARIS_GETPWUID
 347                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 348 #else // SOLARIS_GETPWUID
 349                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 350 #endif // SOLARIS_GETPWUID
 351 #else // HAVE_GETPWUID_R
 352                 pwp = NULL;
 353 #endif // HAVE_GETPWUID_R
 354
 355                 if (pwp == NULL)
 356                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s\n"
 357                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 358                                 strerror(errno));
 359                 else {
 360                         initgroups(pw.pw_name, pw.pw_gid);
 361                         if (setgid(pw.pw_gid))
 362                                 syslog(LOG_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 363                                         strerror(errno));
 364                 }
 365                 syslog(LOG_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 366                 if (setuid(CTDLUID) != 0) {
 367                         syslog(LOG_CRIT, "setuid() failed: %s\n", strerror(errno));
 368                 }
 369 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 370                 prctl(PR_SET_DUMPABLE, 1);
 371 #endif
 372         }
 373
 374         /* We want to check for idle sessions once per minute */
 375         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 376
 377         go_threading();
 378
 379         master_cleanup(exit_signal);
 380         return(0);
 381 }