citadel/server_main.c

   1 /*
   2  * citserver's main() function lives here.
   3  *
   4  * Copyright (c) 1987-2012 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 version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <ctype.h>
  21 #include <signal.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <sys/wait.h>
  25 #include <sys/socket.h>
  26 #include <syslog.h>
  27
  28 #if TIME_WITH_SYS_TIME
  29 # include <sys/time.h>
  30 # include <time.h>
  31 #else
  32 # if HAVE_SYS_TIME_H
  33 #  include <sys/time.h>
  34 # else
  35 #  include <time.h>
  36 # endif
  37 #endif
  38
  39 #include <limits.h>
  40 #include <netinet/in.h>
  41 #include <netdb.h>
  42 #include <sys/un.h>
  43 #include <string.h>
  44 #include <pwd.h>
  45 #include <errno.h>
  46 #include <stdarg.h>
  47 #include <grp.h>
  48 #include <pwd.h>
  49 #ifdef HAVE_SYS_PRCTL_H
  50 #include <sys/prctl.h>
  51 #endif
  52 #include <libcitadel.h>
  53 #include "citadel.h"
  54 #include "server.h"
  55 #include "serv_extensions.h"
  56 #include "sysdep_decls.h"
  57 #include "threads.h"
  58 #include "citserver.h"
  59 #include "support.h"
  60 #include "config.h"
  61 #include "control.h"
  62 #include "database.h"
  63 #include "user_ops.h"
  64 #include "housekeeping.h"
  65 #include "svn_revision.h"
  66 #include "citadel_dirs.h"
  67
  68 #include "context.h"
  69
  70 #include "modules_init.h"
  71 #include "ecrash.h"
  72
  73 #ifdef HAVE_SYS_SELECT_H
  74 #include <sys/select.h>
  75 #endif
  76
  77 #ifndef HAVE_SNPRINTF
  78 #include "snprintf.h"
  79 #endif
  80 const char *CitadelServiceUDS="citadel-UDS";
  81 const char *CitadelServiceTCP="citadel-TCP";
  82
  83
  84
  85 void go_threading(void);
  86
  87 /*
  88  * Here's where it all begins.
  89  */
  90 int main(int argc, char **argv)
  91 {
  92         size_t basesize = 64;
  93         char facility[32];
  94         int a;                  /* General-purpose variables */
  95         struct passwd pw, *pwp = NULL;
  96         char pwbuf[SIZ];
  97         int drop_root_perms = 1;
  98         int relh=0;
  99         int home=0;
 100         int dbg=0;
 101         char relhome[PATH_MAX]="";
 102         char ctdldir[PATH_MAX]=CTDLDIR;
 103         int syslog_facility = LOG_DAEMON;
 104         const char *eDebuglist[] = {NULL, NULL};
 105 #ifdef HAVE_RUN_DIR
 106         struct stat filestats;
 107 #endif
 108 #ifdef HAVE_BACKTRACE
 109         eCrashParameters params;
 110 //      eCrashSymbolTable symbol_table;
 111 #endif
 112
 113         /* initialize the master context */
 114         InitializeMasterCC();
 115         InitializeMasterTSD();
 116
 117         /* parse command-line arguments */
 118         while ((a=getopt(argc, argv, "l:dh:x:t:B:Dr")) != EOF) switch(a) {
 119
 120                 case 'l':
 121                         safestrncpy(facility, optarg, sizeof(facility));
 122                         syslog_facility = SyslogFacility(facility);
 123                         break;
 124
 125                 /* run in the background if -d was specified */
 126                 case 'd':
 127                         running_as_daemon = 1;
 128                         break;
 129
 130                 case 'h':
 131                         relh = optarg[0] != '/';
 132                         if (!relh) {
 133                                 safestrncpy(ctdl_home_directory, optarg, sizeof ctdl_home_directory);
 134                         }
 135                         else {
 136                                 safestrncpy(relhome, optarg, sizeof relhome);
 137                         }
 138                         home=1;
 139                         break;
 140
 141                 case 'x':
 142                         eDebuglist [0] = optarg;
 143                         break;
 144
 145                 case 't':       /* deprecated */
 146                         break;
 147                 case 'B': /* Basesize */
 148                         basesize = atoi(optarg);
 149                         break;
 150
 151                 case 'D':
 152                         dbg = 1;
 153                         break;
 154
 155                 /* -r tells the server not to drop root permissions.
 156                  * Don't use this unless you know what you're doing.
 157                  */
 158                 case 'r':
 159                         drop_root_perms = 0;
 160                         break;
 161
 162                 default:
 163                 /* any other parameter makes it crash and burn */
 164                         fprintf(stderr, "citserver: usage: "
 165                                         "citserver "
 166                                         "[-l LogFacility] "
 167                                         "[-d] [-D] [-r] "
 168                                         "[-h HomeDir]\n"
 169                         );
 170                         exit(1);
 171         }
 172         StartLibCitadel(basesize);
 173         openlog("citserver",
 174                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 175                 syslog_facility
 176         );
 177
 178         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 179         /* daemonize, if we were asked to */
 180         if (running_as_daemon) {
 181                 start_daemon(0);
 182                 drop_root_perms = 1;
 183         }
 184
 185 #ifdef HAVE_BACKTRACE
 186         bzero(&params, sizeof(params));
 187         params.filename = file_pid_paniclog;
 188         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 189         params.filep = fopen(file_pid_paniclog, "a+");
 190         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 191         params.dumpAllThreads = TRUE;
 192         params.useBacktraceSymbols = 1;
 193         params.signals[0]=SIGSEGV;
 194         params.signals[1]=SIGILL;
 195         params.signals[2]=SIGBUS;
 196         params.signals[3]=SIGABRT;
 197         eCrash_Init(&params);
 198         eCrash_RegisterThread("MasterThread", 0);
 199 #endif
 200
 201         /* Tell 'em who's in da house */
 202         syslog(LOG_NOTICE, " ");
 203         syslog(LOG_NOTICE, " ");
 204         syslog(LOG_NOTICE,
 205                 "*** Citadel server engine v%d.%02d (build %s) ***",
 206                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 207         syslog(LOG_NOTICE, "Copyright (C) 1987-2012 by the Citadel development team.");
 208         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 209                                         "General Public License.");
 210         syslog(LOG_NOTICE, " ");
 211         syslog(LOG_DEBUG, "Called as: %s", argv[0]);
 212         syslog(LOG_INFO, "%s", libcitadel_version_string());
 213
 214         /* Load site-specific configuration */
 215         syslog(LOG_INFO, "Loading citadel.config");
 216         get_config();
 217
 218         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 219         syslog(LOG_INFO, "Acquiring control record");
 220         get_control();
 221
 222         put_config();
 223
 224 #ifdef HAVE_RUN_DIR
 225         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 226
 227         if (stat(ctdl_run_dir, &filestats)==-1){
 228 #ifdef HAVE_GETPWUID_R
 229 #ifdef SOLARIS_GETPWUID
 230                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 231 #else // SOLARIS_GETPWUID
 232                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 233 #endif // SOLARIS_GETPWUID
 234 #else // HAVE_GETPWUID_R
 235                 pwp = NULL;
 236 #endif // HAVE_GETPWUID_R
 237
 238                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 239                         syslog(LOG_EMERG,
 240                                       "unable to create run directory [%s]: %s",
 241                                       ctdl_run_dir, strerror(errno));
 242
 243                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 244                         syslog(LOG_EMERG,
 245                                       "unable to set the access rights for [%s]: %s",
 246                                       ctdl_run_dir, strerror(errno));
 247         }
 248
 249
 250 #endif
 251
 252         /* Initialize... */
 253         init_sysdep();
 254
 255         /*
 256          * Do non system dependent startup functions.
 257          */
 258         master_startup();
 259
 260         /*
 261          * Check that the control record is correct and place sensible values if it isn't
 262          */
 263         check_control();
 264
 265         /*
 266          * Run any upgrade entry points
 267          */
 268         syslog(LOG_INFO, "Upgrading modules.");
 269         upgrade_modules();
 270
 271 /*
 272  * Load the user for the masterCC or create them if they don't exist
 273  */
 274         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 275         {
 276                 /* User doesn't exist. We can't use create user here as the user number needs to be 0 */
 277                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 278                 CtdlPutUser(&masterCC.user);
 279                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /* Just to be safe */
 280         }
 281
 282         /*
 283          * Bind the server to a Unix-domain socket (user client access)
 284          */
 285         CtdlRegisterServiceHook(0,
 286                                 file_citadel_socket,
 287                                 citproto_begin_session,
 288                                 do_command_loop,
 289                                 do_async_loop,
 290                                 CitadelServiceUDS);
 291
 292         /*
 293          * Bind the server to a Unix-domain socket (admin client access)
 294          */
 295         CtdlRegisterServiceHook(0,
 296                                 file_citadel_admin_socket,
 297                                 citproto_begin_admin_session,
 298                                 do_command_loop,
 299                                 do_async_loop,
 300                                 CitadelServiceUDS);
 301         chmod(file_citadel_admin_socket, S_IRWXU);      /* for your eyes only */
 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");
 320
 321         initialise_modules(0);
 322
 323         eDebuglist[1] = getenv("CITADEL_LOGDEBUG");
 324         CtdlSetDebugLogFacilities(eDebuglist, 2);
 325
 326         /*
 327          * If we need host auth, start our chkpwd daemon.
 328          */
 329         if (config.c_auth_mode == AUTHMODE_HOST) {
 330                 start_chkpwd_daemon();
 331         }
 332
 333
 334         /*
 335          * check, whether we're fired up another time after a crash.
 336          * if, post an aide message, so the admin has a chance to react.
 337          */
 338         checkcrash ();
 339
 340
 341         /*
 342          * Now that we've bound the sockets, change to the Citadel user id and its
 343          * corresponding group ids
 344          */
 345         if (drop_root_perms) {
 346                 cdb_chmod_data();       /* make sure we own our data files */
 347
 348 #ifdef HAVE_GETPWUID_R
 349 #ifdef SOLARIS_GETPWUID
 350                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 351 #else // SOLARIS_GETPWUID
 352                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 353 #endif // SOLARIS_GETPWUID
 354 #else // HAVE_GETPWUID_R
 355                 pwp = NULL;
 356 #endif // HAVE_GETPWUID_R
 357
 358                 if (pwp == NULL)
 359                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s"
 360                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 361                                 strerror(errno));
 362                 else {
 363                         initgroups(pw.pw_name, pw.pw_gid);
 364                         if (setgid(pw.pw_gid))
 365                                 syslog(LOG_CRIT, "setgid(%ld): %s", (long)pw.pw_gid,
 366                                         strerror(errno));
 367                 }
 368                 syslog(LOG_INFO, "Changing uid to %ld", (long)CTDLUID);
 369                 if (setuid(CTDLUID) != 0) {
 370                         syslog(LOG_CRIT, "setuid() failed: %s", strerror(errno));
 371                 }
 372 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 373                 prctl(PR_SET_DUMPABLE, 1);
 374 #endif
 375         }
 376
 377         /* We want to check for idle sessions once per minute */
 378         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER, PRIO_CLEANUP + 1);
 379
 380         go_threading();
 381
 382         master_cleanup(exit_signal);
 383         return(0);
 384 }