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 #include "ecrash.h"
  28
  29 const char *CitadelServiceUDS="citadel-UDS";
  30 const char *CitadelServiceTCP="citadel-TCP";
  31
  32
  33
  34 void go_threading(void);
  35
  36 /*
  37  * Here's where it all begins.
  38  */
  39 int main(int argc, char **argv)
  40 {
  41         size_t basesize = 64;
  42         char facility[32];
  43         int a;                  /* General-purpose variables */
  44         struct passwd pw, *pwp = NULL;
  45         char pwbuf[SIZ];
  46         int drop_root_perms = 1;
  47         int relh=0;
  48         int home=0;
  49         int dbg=0;
  50         char relhome[PATH_MAX]="";
  51         char ctdldir[PATH_MAX]=CTDLDIR;
  52         int syslog_facility = LOG_DAEMON;
  53         const char *eDebuglist[] = {NULL, NULL};
  54 #ifdef HAVE_RUN_DIR
  55         struct stat filestats;
  56 #endif
  57 #ifdef HAVE_BACKTRACE
  58         eCrashParameters params;
  59 //      eCrashSymbolTable symbol_table;
  60 #endif
  61
  62         /* initialize the master context */
  63         InitializeMasterCC();
  64         InitializeMasterTSD();
  65
  66         /* parse command-line arguments */
  67         while ((a=getopt(argc, argv, "l:dh:x:t:B:Dr")) != EOF) switch(a) {
  68
  69                 case 'l':
  70                         safestrncpy(facility, optarg, sizeof(facility));
  71                         syslog_facility = SyslogFacility(facility);
  72                         break;
  73
  74                 /* run in the background if -d was specified */
  75                 case 'd':
  76                         running_as_daemon = 1;
  77                         break;
  78
  79                 case 'h':
  80                         relh = optarg[0] != '/';
  81                         if (!relh) {
  82                                 safestrncpy(ctdl_home_directory, optarg, sizeof ctdl_home_directory);
  83                         }
  84                         else {
  85                                 safestrncpy(relhome, optarg, sizeof relhome);
  86                         }
  87                         home=1;
  88                         break;
  89
  90                 case 'x':
  91                         eDebuglist [0] = optarg;
  92                         break;
  93
  94                 case 't':       /* deprecated */
  95                         break;
  96                 case 'B': /* Basesize */
  97                         basesize = atoi(optarg);
  98                         break;
  99
 100                 case 'D':
 101                         dbg = 1;
 102                         break;
 103
 104                 /* -r tells the server not to drop root permissions.
 105                  * Don't use this unless you know what you're doing.
 106                  */
 107                 case 'r':
 108                         drop_root_perms = 0;
 109                         break;
 110
 111                 default:
 112                 /* any other parameter makes it crash and burn */
 113                         fprintf(stderr, "citserver: usage: "
 114                                         "citserver "
 115                                         "[-l LogFacility] "
 116                                         "[-d] [-D] [-r] "
 117                                         "[-h HomeDir]\n"
 118                         );
 119                         exit(1);
 120         }
 121         StartLibCitadel(basesize);
 122         openlog("citserver",
 123                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 124                 syslog_facility
 125         );
 126
 127         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 128         /* daemonize, if we were asked to */
 129         if (running_as_daemon) {
 130                 start_daemon(0);
 131                 drop_root_perms = 1;
 132         }
 133
 134 #ifdef HAVE_BACKTRACE
 135         bzero(&params, sizeof(params));
 136         params.filename = file_pid_paniclog;
 137         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 138         params.filep = fopen(file_pid_paniclog, "a+");
 139         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 140         params.dumpAllThreads = TRUE;
 141         params.useBacktraceSymbols = 1;
 142         params.signals[0]=SIGSEGV;
 143         params.signals[1]=SIGILL;
 144         params.signals[2]=SIGBUS;
 145         params.signals[3]=SIGABRT;
 146         eCrash_Init(&params);
 147         eCrash_RegisterThread("MasterThread", 0);
 148 #endif
 149
 150         /* Tell 'em who's in da house */
 151         syslog(LOG_NOTICE, " ");
 152         syslog(LOG_NOTICE, " ");
 153         syslog(LOG_NOTICE,
 154                 "*** Citadel server engine v%d.%02d (build %s) ***",
 155                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 156         syslog(LOG_NOTICE, "Copyright (C) 1987-2013 by the Citadel development team.");
 157         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 158                                         "General Public License.");
 159         syslog(LOG_NOTICE, " ");
 160         syslog(LOG_DEBUG, "Called as: %s", argv[0]);
 161         syslog(LOG_INFO, "%s", libcitadel_version_string());
 162
 163         /* Load site-specific configuration */
 164         syslog(LOG_INFO, "Loading citadel.config");
 165         get_config();
 166
 167         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 168         syslog(LOG_INFO, "Acquiring control record");
 169         get_control();
 170
 171         put_config();
 172
 173 #ifdef HAVE_RUN_DIR
 174         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 175
 176         if (stat(ctdl_run_dir, &filestats)==-1){
 177 #ifdef HAVE_GETPWUID_R
 178 #ifdef SOLARIS_GETPWUID
 179                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 180 #else // SOLARIS_GETPWUID
 181                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 182 #endif // SOLARIS_GETPWUID
 183 #else // HAVE_GETPWUID_R
 184                 pwp = NULL;
 185 #endif // HAVE_GETPWUID_R
 186
 187                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 188                         syslog(LOG_EMERG,
 189                                       "unable to create run directory [%s]: %s",
 190                                       ctdl_run_dir, strerror(errno));
 191
 192                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 193                         syslog(LOG_EMERG,
 194                                       "unable to set the access rights for [%s]: %s",
 195                                       ctdl_run_dir, strerror(errno));
 196         }
 197
 198
 199 #endif
 200
 201         /* Initialize... */
 202         init_sysdep();
 203
 204         /*
 205          * Do non system dependent startup functions.
 206          */
 207         master_startup();
 208
 209         /*
 210          * Check that the control record is correct and place sensible values if it isn't
 211          */
 212         check_control();
 213
 214         /*
 215          * Run any upgrade entry points
 216          */
 217         syslog(LOG_INFO, "Upgrading modules.");
 218         upgrade_modules();
 219
 220 /*
 221  * Load the user for the masterCC or create them if they don't exist
 222  */
 223         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 224         {
 225                 /* User doesn't exist. We can't use create user here as the user number needs to be 0 */
 226                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 227                 CtdlPutUser(&masterCC.user);
 228                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /* Just to be safe */
 229         }
 230
 231         /*
 232          * Bind the server to a Unix-domain socket (user client access)
 233          */
 234         CtdlRegisterServiceHook(0,
 235                                 file_citadel_socket,
 236                                 citproto_begin_session,
 237                                 do_command_loop,
 238                                 do_async_loop,
 239                                 CitadelServiceUDS);
 240
 241         /*
 242          * Bind the server to a Unix-domain socket (admin client access)
 243          */
 244         CtdlRegisterServiceHook(0,
 245                                 file_citadel_admin_socket,
 246                                 citproto_begin_admin_session,
 247                                 do_command_loop,
 248                                 do_async_loop,
 249                                 CitadelServiceUDS);
 250         chmod(file_citadel_admin_socket, S_IRWXU);      /* for your eyes only */
 251
 252         /*
 253          * Bind the server to our favorite TCP port (usually 504).
 254          */
 255         CtdlRegisterServiceHook(config.c_port_number,
 256                                 NULL,
 257                                 citproto_begin_session,
 258                                 do_command_loop,
 259                                 do_async_loop,
 260                                 CitadelServiceTCP);
 261
 262
 263
 264
 265         /*
 266          * Load any server-side extensions available here.
 267          */
 268         syslog(LOG_INFO, "Initializing server extensions");
 269
 270         initialise_modules(0);
 271
 272         eDebuglist[1] = getenv("CITADEL_LOGDEBUG");
 273         CtdlSetDebugLogFacilities(eDebuglist, 2);
 274
 275         /*
 276          * If we need host auth, start our chkpwd daemon.
 277          */
 278         if (config.c_auth_mode == AUTHMODE_HOST) {
 279                 start_chkpwd_daemon();
 280         }
 281
 282
 283         /*
 284          * check, whether we're fired up another time after a crash.
 285          * if, post an aide message, so the admin has a chance to react.
 286          */
 287         checkcrash ();
 288
 289
 290         /*
 291          * Now that we've bound the sockets, change to the Citadel user id and its
 292          * corresponding group ids
 293          */
 294         if (drop_root_perms) {
 295                 cdb_chmod_data();       /* make sure we own our data files */
 296
 297 #ifdef HAVE_GETPWUID_R
 298 #ifdef SOLARIS_GETPWUID
 299                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 300 #else // SOLARIS_GETPWUID
 301                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 302 #endif // SOLARIS_GETPWUID
 303 #else // HAVE_GETPWUID_R
 304                 pwp = NULL;
 305 #endif // HAVE_GETPWUID_R
 306
 307                 if (pwp == NULL)
 308                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s"
 309                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 310                                 strerror(errno));
 311                 else {
 312                         initgroups(pw.pw_name, pw.pw_gid);
 313                         if (setgid(pw.pw_gid))
 314                                 syslog(LOG_CRIT, "setgid(%ld): %s", (long)pw.pw_gid,
 315                                         strerror(errno));
 316                 }
 317                 syslog(LOG_INFO, "Changing uid to %ld", (long)CTDLUID);
 318                 if (setuid(CTDLUID) != 0) {
 319                         syslog(LOG_CRIT, "setuid() failed: %s", strerror(errno));
 320                 }
 321 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 322                 prctl(PR_SET_DUMPABLE, 1);
 323 #endif
 324         }
 325
 326         /* We want to check for idle sessions once per minute */
 327         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER, PRIO_CLEANUP + 1);
 328
 329         go_threading();
 330
 331         master_cleanup(exit_signal);
 332         return(0);
 333 }