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         /* initialize the master context */
 120         InitializeMasterCC();
 121         InitializeMasterTSD();
 122
 123         /* parse command-line arguments */
 124         for (a=1; a<argc; ++a) {
 125
 126                 if (!strncmp(argv[a], "-l", 2)) {
 127                         safestrncpy(facility, &argv[a][2], sizeof(facility));
 128                         syslog_facility = SyslogFacility(facility);
 129                 }
 130
 131                 /* run in the background if -d was specified */
 132                 else if (!strcmp(argv[a], "-d")) {
 133                         running_as_daemon = 1;
 134                 }
 135
 136                 else if (!strncmp(argv[a], "-h", 2)) {
 137                         relh=argv[a][2]!='/';
 138                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 139                                                                    sizeof ctdl_home_directory);
 140                         else
 141                                 safestrncpy(relhome, &argv[a][2],
 142                                                         sizeof relhome);
 143                         home=1;
 144                 }
 145
 146                 else if (!strncmp(argv[a], "-x", 2)) {
 147                         /* deprecated */
 148                 }
 149
 150                 else if (!strncmp(argv[a], "-t", 2)) {
 151                         if (freopen(&argv[a][2], "w", stderr) != stderr)
 152                         {
 153                                 syslog(LOG_EMERG,
 154                                               "unable to open your trace log [%s]: %s",
 155                                               &argv[a][2],
 156                                               strerror(errno));
 157                                 exit(1);
 158                         }
 159                         have_log = 1;
 160                 }
 161
 162                 else if (!strncmp(argv[a], "-D", 2)) {
 163                         dbg = 1;
 164                 }
 165
 166                 /* -r tells the server not to drop root permissions. don't use
 167                  * this unless you know what you're doing. this should be
 168                  * removed in the next release if it proves unnecessary. */
 169                 else if (!strcmp(argv[a], "-r"))
 170                         drop_root_perms = 0;
 171
 172                 /* any other parameter makes it crash and burn */
 173                 else {
 174                         fprintf(stderr, "citserver: usage: "
 175                                         "citserver "
 176                                         "[-lLogFacility] "
 177                                         "[-d] [-D] [-s] "
 178                                         "[-tTraceFile] "
 179                                         "[-hHomeDir]\n"
 180                         );
 181                         exit(1);
 182                 }
 183
 184         }
 185
 186         openlog("citserver",
 187                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 188                 syslog_facility
 189         );
 190
 191         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 192         /* daemonize, if we were asked to */
 193         if (running_as_daemon) {
 194                 start_daemon(0);
 195                 drop_root_perms = 1;
 196         }
 197
 198 #ifdef HAVE_BACKTRACE
 199         bzero(&params, sizeof(params));
 200         params.filename = file_pid_paniclog;
 201         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 202         params.filep = fopen(file_pid_paniclog, "a+");
 203         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 204         params.dumpAllThreads = TRUE;
 205         params.useBacktraceSymbols = 1;
 206         params.signals[0]=SIGSEGV;
 207         params.signals[1]=SIGILL;
 208         params.signals[2]=SIGBUS;
 209         params.signals[3]=SIGABRT;
 210         eCrash_Init(&params);
 211         eCrash_RegisterThread("MasterThread", 0);
 212 #endif
 213
 214         /* Tell 'em who's in da house */
 215         syslog(LOG_NOTICE, " ");
 216         syslog(LOG_NOTICE, " ");
 217         syslog(LOG_NOTICE,
 218                 "*** Citadel server engine v%d.%02d (build %s) ***",
 219                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 220         syslog(LOG_NOTICE, "Copyright (C) 1987-2011 by the Citadel development team.");
 221         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 222                                         "General Public License.");
 223         syslog(LOG_NOTICE, " ");
 224         syslog(LOG_DEBUG, "Called as: %s", argv[0]);
 225         syslog(LOG_INFO, "%s", libcitadel_version_string());
 226
 227         /* Load site-specific parameters, and set the ipgm secret */
 228         syslog(LOG_INFO, "Loading citadel.config");
 229         get_config();
 230         config.c_ipgm_secret = rand();
 231
 232         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 233         syslog(LOG_INFO, "Acquiring control record");
 234         get_control();
 235
 236         put_config();
 237
 238 #ifdef HAVE_RUN_DIR
 239         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 240
 241         if (stat(ctdl_run_dir, &filestats)==-1){
 242 #ifdef HAVE_GETPWUID_R
 243 #ifdef SOLARIS_GETPWUID
 244                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 245 #else // SOLARIS_GETPWUID
 246                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 247 #endif // SOLARIS_GETPWUID
 248 #else // HAVE_GETPWUID_R
 249                 pwp = NULL;
 250 #endif // HAVE_GETPWUID_R
 251
 252                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 253                         syslog(LOG_EMERG,
 254                                       "unable to create run directory [%s]: %s",
 255                                       ctdl_run_dir, strerror(errno));
 256
 257                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 258                         syslog(LOG_EMERG,
 259                                       "unable to set the access rights for [%s]: %s",
 260                                       ctdl_run_dir, strerror(errno));
 261         }
 262
 263
 264 #endif
 265
 266         /* Initialize... */
 267         init_sysdep();
 268
 269         /*
 270          * Do non system dependent startup functions.
 271          */
 272         master_startup();
 273
 274         /*
 275          * Check that the control record is correct and place sensible values if it isn't
 276          */
 277         check_control();
 278
 279         /*
 280          * Run any upgrade entry points
 281          */
 282         syslog(LOG_INFO, "Upgrading modules.");
 283         upgrade_modules();
 284
 285 /*
 286  * Load the user for the masterCC or create them if they don't exist
 287  */
 288         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 289         {
 290                 /* User doesn't exist. We can't use create user here as the user number needs to be 0 */
 291                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 292                 CtdlPutUser(&masterCC.user);
 293                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /* Just to be safe */
 294         }
 295
 296         /*
 297          * Bind the server to a Unix-domain socket.
 298          */
 299         CtdlRegisterServiceHook(0,
 300                                 file_citadel_socket,
 301                                 citproto_begin_session,
 302                                 do_command_loop,
 303                                 do_async_loop,
 304                                 CitadelServiceUDS);
 305
 306         /*
 307          * Bind the server to our favorite TCP port (usually 504).
 308          */
 309         CtdlRegisterServiceHook(config.c_port_number,
 310                                 NULL,
 311                                 citproto_begin_session,
 312                                 do_command_loop,
 313                                 do_async_loop,
 314                                 CitadelServiceTCP);
 315
 316
 317
 318
 319         /*
 320          * Load any server-side extensions available here.
 321          */
 322         syslog(LOG_INFO, "Initializing server extensions\n");
 323         size = strlen(ctdl_home_directory) + 9;
 324
 325         initialise_modules(0);
 326
 327
 328
 329         /*
 330          * If we need host auth, start our chkpwd daemon.
 331          */
 332         if (config.c_auth_mode == AUTHMODE_HOST) {
 333                 start_chkpwd_daemon();
 334         }
 335
 336
 337         /*
 338          * check, whether we're fired up another time after a crash.
 339          * if, post an aide message, so the admin has a chance to react.
 340          */
 341         checkcrash ();
 342
 343
 344         /*
 345          * Now that we've bound the sockets, change to the Citadel user id and its
 346          * corresponding group ids
 347          */
 348         if (drop_root_perms) {
 349                 cdb_chmod_data();       /* make sure we own our data files */
 350
 351 #ifdef HAVE_GETPWUID_R
 352 #ifdef SOLARIS_GETPWUID
 353                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 354 #else // SOLARIS_GETPWUID
 355                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 356 #endif // SOLARIS_GETPWUID
 357 #else // HAVE_GETPWUID_R
 358                 pwp = NULL;
 359 #endif // HAVE_GETPWUID_R
 360
 361                 if (pwp == NULL)
 362                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s\n"
 363                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 364                                 strerror(errno));
 365                 else {
 366                         initgroups(pw.pw_name, pw.pw_gid);
 367                         if (setgid(pw.pw_gid))
 368                                 syslog(LOG_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 369                                         strerror(errno));
 370                 }
 371                 syslog(LOG_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 372                 if (setuid(CTDLUID) != 0) {
 373                         syslog(LOG_CRIT, "setuid() failed: %s\n", strerror(errno));
 374                 }
 375 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 376                 prctl(PR_SET_DUMPABLE, 1);
 377 #endif
 378         }
 379
 380         /* We want to check for idle sessions once per minute */
 381         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 382
 383         go_threading();
 384
 385         master_cleanup(exit_signal);
 386         return(0);
 387 }