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         /* initialise semaphores here. Patch by Matt and davew
 120          * its called here as they are needed by syslog for thread safety
 121          */
 122         InitialiseSemaphores();
 123
 124         /* initialize the master context */
 125         InitializeMasterCC();
 126
 127         /* parse command-line arguments */
 128         for (a=1; a<argc; ++a) {
 129
 130                 if (!strncmp(argv[a], "-l", 2)) {
 131                         safestrncpy(facility, &argv[a][2], sizeof(facility));
 132                         syslog_facility = SyslogFacility(facility);
 133                 }
 134
 135                 /* run in the background if -d was specified */
 136                 else if (!strcmp(argv[a], "-d")) {
 137                         running_as_daemon = 1;
 138                 }
 139
 140                 else if (!strncmp(argv[a], "-h", 2)) {
 141                         relh=argv[a][2]!='/';
 142                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 143                                                                    sizeof ctdl_home_directory);
 144                         else
 145                                 safestrncpy(relhome, &argv[a][2],
 146                                                         sizeof relhome);
 147                         home=1;
 148                 }
 149
 150                 else if (!strncmp(argv[a], "-x", 2)) {
 151                         /* deprecated */
 152                 }
 153
 154                 else if (!strncmp(argv[a], "-t", 2)) {
 155                         if (freopen(&argv[a][2], "w", stderr) != stderr)
 156                         {
 157                                 syslog(LOG_EMERG,
 158                                               "unable to open your trace log [%s]: %s",
 159                                               &argv[a][2],
 160                                               strerror(errno));
 161                                 exit(1);
 162                         }
 163                         have_log = 1;
 164                 }
 165
 166                 else if (!strncmp(argv[a], "-D", 2)) {
 167                         dbg = 1;
 168                 }
 169
 170                 /* -r tells the server not to drop root permissions. don't use
 171                  * this unless you know what you're doing. this should be
 172                  * removed in the next release if it proves unnecessary. */
 173                 else if (!strcmp(argv[a], "-r"))
 174                         drop_root_perms = 0;
 175
 176                 /* any other parameter makes it crash and burn */
 177                 else {
 178                         fprintf(stderr, "citserver: usage: "
 179                                         "citserver "
 180                                         "[-lLogFacility] "
 181                                         "[-d] [-D] [-s] "
 182                                         "[-tTraceFile] "
 183                                         "[-hHomeDir]\n"
 184                         );
 185                         exit(1);
 186                 }
 187
 188         }
 189
 190         openlog("citserver",
 191                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 192                 syslog_facility
 193         );
 194
 195         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 196         /* daemonize, if we were asked to */
 197         if (running_as_daemon) {
 198                 start_daemon(0);
 199                 drop_root_perms = 1;
 200         }
 201
 202 #ifdef HAVE_BACKTRACE
 203         bzero(&params, sizeof(params));
 204         params.filename = file_pid_paniclog;
 205         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 206         params.filep = fopen(file_pid_paniclog, "a+");
 207         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 208         params.dumpAllThreads = TRUE;
 209         params.useBacktraceSymbols = 1;
 210         params.signals[0]=SIGSEGV;
 211         params.signals[1]=SIGILL;
 212         params.signals[2]=SIGBUS;
 213         params.signals[3]=SIGABRT;
 214         eCrash_Init(&params);
 215         eCrash_RegisterThread("MasterThread", 0);
 216 #endif
 217
 218         /* Tell 'em who's in da house */
 219         syslog(LOG_NOTICE, "\n");
 220         syslog(LOG_NOTICE, "\n");
 221         syslog(LOG_NOTICE,
 222                 "*** Citadel server engine v%d.%02d (build %s) ***\n",
 223                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 224         syslog(LOG_NOTICE, "Copyright (C) 1987-2010 by the Citadel development team.\n");
 225         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 226                                         "General Public License.\n");
 227         syslog(LOG_NOTICE, "\n");
 228         syslog(LOG_DEBUG, "Called as: %s\n", argv[0]);
 229         syslog(LOG_INFO, "%s\n", libcitadel_version_string());
 230
 231         /* Load site-specific parameters, and set the ipgm secret */
 232         syslog(LOG_INFO, "Loading citadel.config\n");
 233         get_config();
 234         config.c_ipgm_secret = rand();
 235
 236         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 237         syslog(LOG_INFO, "Acquiring control record\n");
 238         get_control();
 239
 240         put_config();
 241
 242 #ifdef HAVE_RUN_DIR
 243         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 244
 245         if (stat(ctdl_run_dir, &filestats)==-1){
 246 #ifdef HAVE_GETPWUID_R
 247 #ifdef SOLARIS_GETPWUID
 248                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 249 #else // SOLARIS_GETPWUID
 250                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 251 #endif // SOLARIS_GETPWUID
 252 #else // HAVE_GETPWUID_R
 253                 pwp = NULL;
 254 #endif // HAVE_GETPWUID_R
 255
 256                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 257                         syslog(LOG_EMERG,
 258                                       "unable to create run directory [%s]: %s",
 259                                       ctdl_run_dir, strerror(errno));
 260
 261                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 262                         syslog(LOG_EMERG,
 263                                       "unable to set the access rights for [%s]: %s",
 264                                       ctdl_run_dir, strerror(errno));
 265         }
 266
 267
 268 #endif
 269
 270         /* Initialize... */
 271         init_sysdep();
 272
 273         /*
 274          * Do non system dependent startup functions.
 275          */
 276         master_startup();
 277
 278         /*
 279          * Check that the control record is correct and place sensible values if it isn't
 280          */
 281         check_control();
 282
 283         /*
 284          * Run any upgrade entry points
 285          */
 286         syslog(LOG_INFO, "Upgrading modules.\n");
 287         upgrade_modules();
 288
 289 /**
 290  * Load the user for the masterCC or create them if they don't exist
 291  */
 292         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 293         {
 294                 /** User doesn't exist. We can't use create user here as the user number needs to be 0 */
 295                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 296                 CtdlPutUser(&masterCC.user);
 297                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /** Just to be safe */
 298         }
 299
 300         /*
 301          * Bind the server to a Unix-domain socket.
 302          */
 303         CtdlRegisterServiceHook(0,
 304                                 file_citadel_socket,
 305                                 citproto_begin_session,
 306                                 do_command_loop,
 307                                 do_async_loop,
 308                                 CitadelServiceUDS);
 309
 310         /*
 311          * Bind the server to our favorite TCP port (usually 504).
 312          */
 313         CtdlRegisterServiceHook(config.c_port_number,
 314                                 NULL,
 315                                 citproto_begin_session,
 316                                 do_command_loop,
 317                                 do_async_loop,
 318                                 CitadelServiceTCP);
 319
 320
 321
 322
 323         /*
 324          * Load any server-side extensions available here.
 325          */
 326         syslog(LOG_INFO, "Initializing server extensions\n");
 327         size = strlen(ctdl_home_directory) + 9;
 328
 329         initialise_modules(0);
 330
 331
 332
 333         /*
 334          * If we need host auth, start our chkpwd daemon.
 335          */
 336         if (config.c_auth_mode == AUTHMODE_HOST) {
 337                 start_chkpwd_daemon();
 338         }
 339
 340
 341         /*
 342          * check, whether we're fired up another time after a crash.
 343          * if, post an aide message, so the admin has a chance to react.
 344          */
 345         checkcrash ();
 346
 347
 348         /*
 349          * Now that we've bound the sockets, change to the Citadel user id and its
 350          * corresponding group ids
 351          */
 352         if (drop_root_perms) {
 353                 cdb_chmod_data();       /* make sure we own our data files */
 354
 355 #ifdef HAVE_GETPWUID_R
 356 #ifdef SOLARIS_GETPWUID
 357                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 358 #else // SOLARIS_GETPWUID
 359                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 360 #endif // SOLARIS_GETPWUID
 361 #else // HAVE_GETPWUID_R
 362                 pwp = NULL;
 363 #endif // HAVE_GETPWUID_R
 364
 365                 if (pwp == NULL)
 366                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s\n"
 367                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 368                                 strerror(errno));
 369                 else {
 370                         initgroups(pw.pw_name, pw.pw_gid);
 371                         if (setgid(pw.pw_gid))
 372                                 syslog(LOG_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 373                                         strerror(errno));
 374                 }
 375                 syslog(LOG_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 376                 if (setuid(CTDLUID) != 0) {
 377                         syslog(LOG_CRIT, "setuid() failed: %s\n", strerror(errno));
 378                 }
 379 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 380                 prctl(PR_SET_DUMPABLE, 1);
 381 #endif
 382         }
 383
 384         /* We want to check for idle sessions once per minute */
 385         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 386
 387         go_threading();
 388
 389         master_cleanup(exit_signal);
 390         return(0);
 391 }