citadel/server_main.c

   1 /*
   2  * citserver's main() function lives here.
   3  *
   4  * Copyright (c) 1987-2013 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 #include <stdio.h>
  15 #include <sys/types.h>
  16 #include <grp.h>
  17 #include <libcitadel.h>
  18
  19 #include "citserver.h"
  20 #include "svn_revision.h"
  21 #include "modules_init.h"
  22 #include "config.h"
  23 #include "control.h"
  24 #include "serv_extensions.h"
  25 #include "citadel_dirs.h"
  26 #include "user_ops.h"
  27
  28 const char *CitadelServiceUDS="citadel-UDS";
  29 const char *CitadelServiceTCP="citadel-TCP";
  30
  31
  32
  33 void go_threading(void);
  34
  35 /*
  36  * Here's where it all begins.
  37  */
  38 int main(int argc, char **argv)
  39 {
  40         size_t basesize = 64;
  41         char facility[32];
  42         int a;                  /* General-purpose variables */
  43         struct passwd pw, *pwp = NULL;
  44         char pwbuf[SIZ];
  45         int drop_root_perms = 1;
  46         int relh=0;
  47         int home=0;
  48         int dbg=0;
  49         char relhome[PATH_MAX]="";
  50         char ctdldir[PATH_MAX]=CTDLDIR;
  51         int syslog_facility = LOG_DAEMON;
  52         const char *eDebuglist[] = {NULL, NULL};
  53 #ifdef HAVE_RUN_DIR
  54         struct stat filestats;
  55 #endif
  56 #ifdef HAVE_BACKTRACE
  57         eCrashParameters params;
  58 //      eCrashSymbolTable symbol_table;
  59 #endif
  60
  61         /* initialize the master context */
  62         InitializeMasterCC();
  63         InitializeMasterTSD();
  64
  65         /* parse command-line arguments */
  66         while ((a=getopt(argc, argv, "l:dh:x:t:B:Dr")) != EOF) switch(a) {
  67
  68                 case 'l':
  69                         safestrncpy(facility, optarg, sizeof(facility));
  70                         syslog_facility = SyslogFacility(facility);
  71                         break;
  72
  73                 /* run in the background if -d was specified */
  74                 case 'd':
  75                         running_as_daemon = 1;
  76                         break;
  77
  78                 case 'h':
  79                         relh = optarg[0] != '/';
  80                         if (!relh) {
  81                                 safestrncpy(ctdl_home_directory, optarg, sizeof ctdl_home_directory);
  82                         }
  83                         else {
  84                                 safestrncpy(relhome, optarg, sizeof relhome);
  85                         }
  86                         home=1;
  87                         break;
  88
  89                 case 'x':
  90                         eDebuglist [0] = optarg;
  91                         break;
  92
  93                 case 't':       /* deprecated */
  94                         break;
  95                 case 'B': /* Basesize */
  96                         basesize = atoi(optarg);
  97                         break;
  98
  99                 case 'D':
 100                         dbg = 1;
 101                         break;
 102
 103                 /* -r tells the server not to drop root permissions.
 104                  * Don't use this unless you know what you're doing.
 105                  */
 106                 case 'r':
 107                         drop_root_perms = 0;
 108                         break;
 109
 110                 default:
 111                 /* any other parameter makes it crash and burn */
 112                         fprintf(stderr, "citserver: usage: "
 113                                         "citserver "
 114                                         "[-l LogFacility] "
 115                                         "[-d] [-D] [-r] "
 116                                         "[-h HomeDir]\n"
 117                         );
 118                         exit(1);
 119         }
 120         StartLibCitadel(basesize);
 121         openlog("citserver",
 122                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 123                 syslog_facility
 124         );
 125
 126         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 127         /* daemonize, if we were asked to */
 128         if (running_as_daemon) {
 129                 start_daemon(0);
 130                 drop_root_perms = 1;
 131         }
 132
 133 #ifdef HAVE_BACKTRACE
 134         bzero(&params, sizeof(params));
 135         params.filename = file_pid_paniclog;
 136         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 137         params.filep = fopen(file_pid_paniclog, "a+");
 138         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 139         params.dumpAllThreads = TRUE;
 140         params.useBacktraceSymbols = 1;
 141         params.signals[0]=SIGSEGV;
 142         params.signals[1]=SIGILL;
 143         params.signals[2]=SIGBUS;
 144         params.signals[3]=SIGABRT;
 145         eCrash_Init(&params);
 146         eCrash_RegisterThread("MasterThread", 0);
 147 #endif
 148
 149         /* Tell 'em who's in da house */
 150         syslog(LOG_NOTICE, " ");
 151         syslog(LOG_NOTICE, " ");
 152         syslog(LOG_NOTICE,
 153                 "*** Citadel server engine v%d.%02d (build %s) ***",
 154                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 155         syslog(LOG_NOTICE, "Copyright (C) 1987-2013 by the Citadel development team.");
 156         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 157                                         "General Public License.");
 158         syslog(LOG_NOTICE, " ");
 159         syslog(LOG_DEBUG, "Called as: %s", argv[0]);
 160         syslog(LOG_INFO, "%s", libcitadel_version_string());
 161
 162         /* Load site-specific configuration */
 163         syslog(LOG_INFO, "Loading citadel.config");
 164         get_config();
 165
 166         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 167         syslog(LOG_INFO, "Acquiring control record");
 168         get_control();
 169
 170         put_config();
 171
 172 #ifdef HAVE_RUN_DIR
 173         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 174
 175         if (stat(ctdl_run_dir, &filestats)==-1){
 176 #ifdef HAVE_GETPWUID_R
 177 #ifdef SOLARIS_GETPWUID
 178                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 179 #else // SOLARIS_GETPWUID
 180                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 181 #endif // SOLARIS_GETPWUID
 182 #else // HAVE_GETPWUID_R
 183                 pwp = NULL;
 184 #endif // HAVE_GETPWUID_R
 185
 186                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 187                         syslog(LOG_EMERG,
 188                                       "unable to create run directory [%s]: %s",
 189                                       ctdl_run_dir, strerror(errno));
 190
 191                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 192                         syslog(LOG_EMERG,
 193                                       "unable to set the access rights for [%s]: %s",
 194                                       ctdl_run_dir, strerror(errno));
 195         }
 196
 197
 198 #endif
 199
 200         /* Initialize... */
 201         init_sysdep();
 202
 203         /*
 204          * Do non system dependent startup functions.
 205          */
 206         master_startup();
 207
 208         /*
 209          * Check that the control record is correct and place sensible values if it isn't
 210          */
 211         check_control();
 212
 213         /*
 214          * Run any upgrade entry points
 215          */
 216         syslog(LOG_INFO, "Upgrading modules.");
 217         upgrade_modules();
 218
 219 /*
 220  * Load the user for the masterCC or create them if they don't exist
 221  */
 222         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 223         {
 224                 /* User doesn't exist. We can't use create user here as the user number needs to be 0 */
 225                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 226                 CtdlPutUser(&masterCC.user);
 227                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /* Just to be safe */
 228         }
 229
 230         /*
 231          * Bind the server to a Unix-domain socket (user client access)
 232          */
 233         CtdlRegisterServiceHook(0,
 234                                 file_citadel_socket,
 235                                 citproto_begin_session,
 236                                 do_command_loop,
 237                                 do_async_loop,
 238                                 CitadelServiceUDS);
 239
 240         /*
 241          * Bind the server to a Unix-domain socket (admin client access)
 242          */
 243         CtdlRegisterServiceHook(0,
 244                                 file_citadel_admin_socket,
 245                                 citproto_begin_admin_session,
 246                                 do_command_loop,
 247                                 do_async_loop,
 248                                 CitadelServiceUDS);
 249         chmod(file_citadel_admin_socket, S_IRWXU);      /* for your eyes only */
 250
 251         /*
 252          * Bind the server to our favorite TCP port (usually 504).
 253          */
 254         CtdlRegisterServiceHook(config.c_port_number,
 255                                 NULL,
 256                                 citproto_begin_session,
 257                                 do_command_loop,
 258                                 do_async_loop,
 259                                 CitadelServiceTCP);
 260
 261
 262
 263
 264         /*
 265          * Load any server-side extensions available here.
 266          */
 267         syslog(LOG_INFO, "Initializing server extensions");
 268
 269         initialise_modules(0);
 270
 271         eDebuglist[1] = getenv("CITADEL_LOGDEBUG");
 272         CtdlSetDebugLogFacilities(eDebuglist, 2);
 273
 274         /*
 275          * If we need host auth, start our chkpwd daemon.
 276          */
 277         if (config.c_auth_mode == AUTHMODE_HOST) {
 278                 start_chkpwd_daemon();
 279         }
 280
 281
 282         /*
 283          * check, whether we're fired up another time after a crash.
 284          * if, post an aide message, so the admin has a chance to react.
 285          */
 286         checkcrash ();
 287
 288
 289         /*
 290          * Now that we've bound the sockets, change to the Citadel user id and its
 291          * corresponding group ids
 292          */
 293         if (drop_root_perms) {
 294                 cdb_chmod_data();       /* make sure we own our data files */
 295
 296 #ifdef HAVE_GETPWUID_R
 297 #ifdef SOLARIS_GETPWUID
 298                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 299 #else // SOLARIS_GETPWUID
 300                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 301 #endif // SOLARIS_GETPWUID
 302 #else // HAVE_GETPWUID_R
 303                 pwp = NULL;
 304 #endif // HAVE_GETPWUID_R
 305
 306                 if (pwp == NULL)
 307                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s"
 308                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 309                                 strerror(errno));
 310                 else {
 311                         initgroups(pw.pw_name, pw.pw_gid);
 312                         if (setgid(pw.pw_gid))
 313                                 syslog(LOG_CRIT, "setgid(%ld): %s", (long)pw.pw_gid,
 314                                         strerror(errno));
 315                 }
 316                 syslog(LOG_INFO, "Changing uid to %ld", (long)CTDLUID);
 317                 if (setuid(CTDLUID) != 0) {
 318                         syslog(LOG_CRIT, "setuid() failed: %s", strerror(errno));
 319                 }
 320 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 321                 prctl(PR_SET_DUMPABLE, 1);
 322 #endif
 323         }
 324
 325         /* We want to check for idle sessions once per minute */
 326         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER, PRIO_CLEANUP + 1);
 327
 328         go_threading();
 329
 330         master_cleanup(exit_signal);
 331         return(0);
 332 }