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         int have_log=0;
 110         int have_minus_x=0;
 111         char relhome[PATH_MAX]="";
 112         char ctdldir[PATH_MAX]=CTDLDIR;
 113 #ifdef HAVE_RUN_DIR
 114         struct stat filestats;
 115 #endif
 116 #ifdef HAVE_BACKTRACE
 117         eCrashParameters params;
 118 //      eCrashSymbolTable symbol_table;
 119 #endif
 120
 121 #ifdef HAVE_GC
 122         GC_INIT();
 123         GC_find_leak = 1;
 124 #endif
 125
 126
 127         /* initialise semaphores here. Patch by Matt and davew
 128          * its called here as they are needed by CtdlLogPrintf for thread safety
 129          */
 130         InitialiseSemaphores();
 131
 132         /* initialize the master context */
 133         InitializeMasterCC();
 134
 135         /* parse command-line arguments */
 136         for (a=1; a<argc; ++a) {
 137
 138                 if (!strncmp(argv[a], "-l", 2)) {
 139                         safestrncpy(facility, &argv[a][2], sizeof(facility));
 140                         syslog_facility = SyslogFacility(facility);
 141                         enable_syslog = 1;
 142                 }
 143
 144                 /* run in the background if -d was specified */
 145                 else if (!strcmp(argv[a], "-d")) {
 146                         running_as_daemon = 1;
 147                 }
 148
 149                 /* run a few stats if -s was specified */
 150                 else if (!strncmp(argv[a], "-s", 2)) {
 151                         statcount = atoi(&argv[a][2]);
 152                 }
 153
 154                 /* -x specifies the desired logging level */
 155                 else if (!strncmp(argv[a], "-x", 2)) {
 156                         verbosity = atoi(&argv[a][2]);
 157                         have_minus_x = 1;
 158                 }
 159
 160                 else if (!strncmp(argv[a], "-h", 2)) {
 161                         relh=argv[a][2]!='/';
 162                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 163                                                                    sizeof ctdl_home_directory);
 164                         else
 165                                 safestrncpy(relhome, &argv[a][2],
 166                                                         sizeof relhome);
 167                         home=1;
 168                 }
 169
 170                 else if (!strncmp(argv[a], "-t", 2)) {
 171                         if (freopen(&argv[a][2], "w", stderr) != stderr)
 172                         {
 173                                 CtdlLogPrintf(CTDL_EMERG,
 174                                               "unable to open your trace log [%s]: %s",
 175                                               &argv[a][2],
 176                                               strerror(errno));
 177                                 exit(1);
 178                         }
 179                         have_log = 1;
 180                 }
 181
 182                 else if (!strncmp(argv[a], "-D", 2)) {
 183                         dbg = 1;
 184                 }
 185
 186                 /* -r tells the server not to drop root permissions. don't use
 187                  * this unless you know what you're doing. this should be
 188                  * removed in the next release if it proves unnecessary. */
 189                 else if (!strcmp(argv[a], "-r"))
 190                         drop_root_perms = 0;
 191
 192                 /* any other parameter makes it crash and burn */
 193                 else {
 194                         CtdlLogPrintf(CTDL_EMERG,       "citserver: usage: "
 195                                         "citserver "
 196                                         "[-lLogFacility] "
 197                                         "[-d] [-D] [-s]"
 198                                         " [-tTraceFile]"
 199                                         " [-xLogLevel] [-hHomeDir]\n");
 200                         exit(1);
 201                 }
 202
 203         }
 204
 205         if (have_minus_x && running_as_daemon && have_log)
 206                 print_to_logfile = 1;
 207
 208         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 209         /* daemonize, if we were asked to */
 210         if (running_as_daemon) {
 211                 start_daemon(0);
 212                 drop_root_perms = 1;
 213         }
 214
 215 #ifdef HAVE_BACKTRACE
 216         bzero(&params, sizeof(params));
 217         params.filename = file_pid_paniclog;
 218         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 219         params.filep = fopen(file_pid_paniclog, "a+");
 220         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 221         params.dumpAllThreads = TRUE;
 222         params.useBacktraceSymbols = 1;
 223         params.signals[0]=SIGSEGV;
 224         params.signals[1]=SIGILL;
 225         params.signals[2]=SIGBUS;
 226         params.signals[3]=SIGABRT;
 227         eCrash_Init(&params);
 228         eCrash_RegisterThread("MasterThread", 0);
 229 #endif
 230
 231         /* Initialize the syslogger.  Yes, we are really using 0 as the
 232          * facility, because we are going to bitwise-OR the facility to
 233          * the severity of each message, allowing us to write to other
 234          * facilities when we need to...
 235          */
 236         if (enable_syslog) {
 237                 openlog("citadel", LOG_NDELAY, 0);
 238                 setlogmask(LOG_UPTO(verbosity));
 239         }
 240
 241         /* Tell 'em who's in da house */
 242         CtdlLogPrintf(CTDL_NOTICE, "\n");
 243         CtdlLogPrintf(CTDL_NOTICE, "\n");
 244         CtdlLogPrintf(CTDL_NOTICE,
 245                 "*** Citadel server engine v%d.%02d (build %s) ***\n",
 246                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 247         CtdlLogPrintf(CTDL_NOTICE, "Copyright (C) 1987-2010 by the Citadel development team.\n");
 248         CtdlLogPrintf(CTDL_NOTICE, "This program is distributed under the terms of the GNU "
 249                                         "General Public License.\n");
 250         CtdlLogPrintf(CTDL_NOTICE, "\n");
 251         CtdlLogPrintf(CTDL_DEBUG, "Called as: %s\n", argv[0]);
 252         CtdlLogPrintf(CTDL_INFO, "%s\n", libcitadel_version_string());
 253
 254         /* Load site-specific parameters, and set the ipgm secret */
 255         CtdlLogPrintf(CTDL_INFO, "Loading citadel.config\n");
 256         get_config();
 257         config.c_ipgm_secret = rand();
 258
 259         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 260         CtdlLogPrintf(CTDL_INFO, "Acquiring control record\n");
 261         get_control();
 262
 263         put_config();
 264
 265 #ifdef HAVE_RUN_DIR
 266         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 267
 268         if (stat(ctdl_run_dir, &filestats)==-1){
 269 #ifdef HAVE_GETPWUID_R
 270 #ifdef SOLARIS_GETPWUID
 271                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 272 #else // SOLARIS_GETPWUID
 273                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 274 #endif // SOLARIS_GETPWUID
 275 #else // HAVE_GETPWUID_R
 276                 pwp = NULL;
 277 #endif // HAVE_GETPWUID_R
 278
 279                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 280                         CtdlLogPrintf(CTDL_EMERG,
 281                                       "unable to create run directory [%s]: %s",
 282                                       ctdl_run_dir, strerror(errno));
 283
 284                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 285                         CtdlLogPrintf(CTDL_EMERG,
 286                                       "unable to set the access rights for [%s]: %s",
 287                                       ctdl_run_dir, strerror(errno));
 288         }
 289
 290
 291 #endif
 292
 293         /* Initialize... */
 294         init_sysdep();
 295
 296         /*
 297          * Do non system dependent startup functions.
 298          */
 299         master_startup();
 300
 301         /*
 302          * Check that the control record is correct and place sensible values if it isn't
 303          */
 304         check_control();
 305
 306         /*
 307          * Run any upgrade entry points
 308          */
 309         CtdlLogPrintf(CTDL_INFO, "Upgrading modules.\n");
 310         upgrade_modules();
 311
 312 /**
 313  * Load the user for the masterCC or create them if they don't exist
 314  */
 315         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 316         {
 317                 /** User doesn't exist. We can't use create user here as the user number needs to be 0 */
 318                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 319                 CtdlPutUser(&masterCC.user);
 320                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /** Just to be safe */
 321         }
 322
 323         /*
 324          * Bind the server to a Unix-domain socket.
 325          */
 326         CtdlRegisterServiceHook(0,
 327                                 file_citadel_socket,
 328                                 citproto_begin_session,
 329                                 do_command_loop,
 330                                 do_async_loop,
 331                                 CitadelServiceUDS);
 332
 333         /*
 334          * Bind the server to our favorite TCP port (usually 504).
 335          */
 336         CtdlRegisterServiceHook(config.c_port_number,
 337                                 NULL,
 338                                 citproto_begin_session,
 339                                 do_command_loop,
 340                                 do_async_loop,
 341                                 CitadelServiceTCP);
 342
 343
 344
 345
 346         /*
 347          * Load any server-side extensions available here.
 348          */
 349         CtdlLogPrintf(CTDL_INFO, "Initializing server extensions\n");
 350         size = strlen(ctdl_home_directory) + 9;
 351
 352         initialise_modules(0);
 353
 354
 355
 356         /*
 357          * If we need host auth, start our chkpwd daemon.
 358          */
 359         if (config.c_auth_mode == AUTHMODE_HOST) {
 360                 start_chkpwd_daemon();
 361         }
 362
 363
 364         /*
 365          * check, whether we're fired up another time after a crash.
 366          * if, post an aide message, so the admin has a chance to react.
 367          */
 368         checkcrash ();
 369
 370
 371         /*
 372          * Now that we've bound the sockets, change to the Citadel user id and its
 373          * corresponding group ids
 374          */
 375         if (drop_root_perms) {
 376                 cdb_chmod_data();       /* make sure we own our data files */
 377
 378 #ifdef HAVE_GETPWUID_R
 379 #ifdef SOLARIS_GETPWUID
 380                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 381 #else // SOLARIS_GETPWUID
 382                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 383 #endif // SOLARIS_GETPWUID
 384 #else // HAVE_GETPWUID_R
 385                 pwp = NULL;
 386 #endif // HAVE_GETPWUID_R
 387
 388                 if (pwp == NULL)
 389                         CtdlLogPrintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 390                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 391                                 strerror(errno));
 392                 else {
 393                         initgroups(pw.pw_name, pw.pw_gid);
 394                         if (setgid(pw.pw_gid))
 395                                 CtdlLogPrintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 396                                         strerror(errno));
 397                 }
 398                 CtdlLogPrintf(CTDL_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 399                 if (setuid(CTDLUID) != 0) {
 400                         CtdlLogPrintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 401                 }
 402 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 403                 prctl(PR_SET_DUMPABLE, 1);
 404 #endif
 405         }
 406
 407         /* We want to check for idle sessions once per minute */
 408         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 409
 410         go_threading();
 411
 412
 413         master_cleanup(exit_signal);
 414         return(0);
 415 }