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 const char *CitadelServiceUDS="citadel-UDS";
  78 const char *CitadelServiceTCP="citadel-TCP";
  79
  80
  81
  82 void go_threading(void);
  83
  84 /*
  85  * Here's where it all begins.
  86  */
  87 int main(int argc, char **argv)
  88 {
  89         size_t basesize = 64;
  90         char facility[32];
  91         int a;                  /* General-purpose variables */
  92         struct passwd pw, *pwp = NULL;
  93         char pwbuf[SIZ];
  94         int drop_root_perms = 1;
  95         int relh=0;
  96         int home=0;
  97         int dbg=0;
  98         char relhome[PATH_MAX]="";
  99         char ctdldir[PATH_MAX]=CTDLDIR;
 100         int syslog_facility = LOG_DAEMON;
 101         const char *eDebuglist[] = {NULL, NULL};
 102 #ifdef HAVE_RUN_DIR
 103         struct stat filestats;
 104 #endif
 105 #ifdef HAVE_BACKTRACE
 106         eCrashParameters params;
 107 //      eCrashSymbolTable symbol_table;
 108 #endif
 109
 110         /* initialize the master context */
 111         InitializeMasterCC();
 112         InitializeMasterTSD();
 113
 114         /* parse command-line arguments */
 115         while ((a=getopt(argc, argv, "l:dh:x:t:B:Dr")) != EOF) switch(a) {
 116
 117                 case 'l':
 118                         safestrncpy(facility, optarg, sizeof(facility));
 119                         syslog_facility = SyslogFacility(facility);
 120                         break;
 121
 122                 /* run in the background if -d was specified */
 123                 case 'd':
 124                         running_as_daemon = 1;
 125                         break;
 126
 127                 case 'h':
 128                         relh = optarg[0] != '/';
 129                         if (!relh) {
 130                                 safestrncpy(ctdl_home_directory, optarg, sizeof ctdl_home_directory);
 131                         }
 132                         else {
 133                                 safestrncpy(relhome, optarg, sizeof relhome);
 134                         }
 135                         home=1;
 136                         break;
 137
 138                 case 'x':
 139                         eDebuglist [0] = optarg;
 140                         break;
 141
 142                 case 't':       /* deprecated */
 143                         break;
 144                 case 'B': /* Basesize */
 145                         basesize = atoi(optarg);
 146                         break;
 147
 148                 case 'D':
 149                         dbg = 1;
 150                         break;
 151
 152                 /* -r tells the server not to drop root permissions.
 153                  * Don't use this unless you know what you're doing.
 154                  */
 155                 case 'r':
 156                         drop_root_perms = 0;
 157                         break;
 158
 159                 default:
 160                 /* any other parameter makes it crash and burn */
 161                         fprintf(stderr, "citserver: usage: "
 162                                         "citserver "
 163                                         "[-l LogFacility] "
 164                                         "[-d] [-D] [-r] "
 165                                         "[-h HomeDir]\n"
 166                         );
 167                         exit(1);
 168         }
 169         StartLibCitadel(basesize);
 170         openlog("citserver",
 171                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 172                 syslog_facility
 173         );
 174
 175         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 176         /* daemonize, if we were asked to */
 177         if (running_as_daemon) {
 178                 start_daemon(0);
 179                 drop_root_perms = 1;
 180         }
 181
 182 #ifdef HAVE_BACKTRACE
 183         bzero(&params, sizeof(params));
 184         params.filename = file_pid_paniclog;
 185         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 186         params.filep = fopen(file_pid_paniclog, "a+");
 187         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 188         params.dumpAllThreads = TRUE;
 189         params.useBacktraceSymbols = 1;
 190         params.signals[0]=SIGSEGV;
 191         params.signals[1]=SIGILL;
 192         params.signals[2]=SIGBUS;
 193         params.signals[3]=SIGABRT;
 194         eCrash_Init(&params);
 195         eCrash_RegisterThread("MasterThread", 0);
 196 #endif
 197
 198         /* Tell 'em who's in da house */
 199         syslog(LOG_NOTICE, " ");
 200         syslog(LOG_NOTICE, " ");
 201         syslog(LOG_NOTICE,
 202                 "*** Citadel server engine v%d.%02d (build %s) ***",
 203                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 204         syslog(LOG_NOTICE, "Copyright (C) 1987-2012 by the Citadel development team.");
 205         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 206                                         "General Public License.");
 207         syslog(LOG_NOTICE, " ");
 208         syslog(LOG_DEBUG, "Called as: %s", argv[0]);
 209         syslog(LOG_INFO, "%s", libcitadel_version_string());
 210
 211         /* Load site-specific configuration */
 212         syslog(LOG_INFO, "Loading citadel.config");
 213         get_config();
 214
 215         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 216         syslog(LOG_INFO, "Acquiring control record");
 217         get_control();
 218
 219         put_config();
 220
 221 #ifdef HAVE_RUN_DIR
 222         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 223
 224         if (stat(ctdl_run_dir, &filestats)==-1){
 225 #ifdef HAVE_GETPWUID_R
 226 #ifdef SOLARIS_GETPWUID
 227                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 228 #else // SOLARIS_GETPWUID
 229                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 230 #endif // SOLARIS_GETPWUID
 231 #else // HAVE_GETPWUID_R
 232                 pwp = NULL;
 233 #endif // HAVE_GETPWUID_R
 234
 235                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 236                         syslog(LOG_EMERG,
 237                                       "unable to create run directory [%s]: %s",
 238                                       ctdl_run_dir, strerror(errno));
 239
 240                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 241                         syslog(LOG_EMERG,
 242                                       "unable to set the access rights for [%s]: %s",
 243                                       ctdl_run_dir, strerror(errno));
 244         }
 245
 246
 247 #endif
 248
 249         /* Initialize... */
 250         init_sysdep();
 251
 252         /*
 253          * Do non system dependent startup functions.
 254          */
 255         master_startup();
 256
 257         /*
 258          * Check that the control record is correct and place sensible values if it isn't
 259          */
 260         check_control();
 261
 262         /*
 263          * Run any upgrade entry points
 264          */
 265         syslog(LOG_INFO, "Upgrading modules.");
 266         upgrade_modules();
 267
 268 /*
 269  * Load the user for the masterCC or create them if they don't exist
 270  */
 271         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 272         {
 273                 /* User doesn't exist. We can't use create user here as the user number needs to be 0 */
 274                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 275                 CtdlPutUser(&masterCC.user);
 276                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /* Just to be safe */
 277         }
 278
 279         /*
 280          * Bind the server to a Unix-domain socket (user client access)
 281          */
 282         CtdlRegisterServiceHook(0,
 283                                 file_citadel_socket,
 284                                 citproto_begin_session,
 285                                 do_command_loop,
 286                                 do_async_loop,
 287                                 CitadelServiceUDS);
 288
 289         /*
 290          * Bind the server to a Unix-domain socket (admin client access)
 291          */
 292         CtdlRegisterServiceHook(0,
 293                                 file_citadel_admin_socket,
 294                                 citproto_begin_admin_session,
 295                                 do_command_loop,
 296                                 do_async_loop,
 297                                 CitadelServiceUDS);
 298         chmod(file_citadel_admin_socket, S_IRWXU);      /* for your eyes only */
 299
 300         /*
 301          * Bind the server to our favorite TCP port (usually 504).
 302          */
 303         CtdlRegisterServiceHook(config.c_port_number,
 304                                 NULL,
 305                                 citproto_begin_session,
 306                                 do_command_loop,
 307                                 do_async_loop,
 308                                 CitadelServiceTCP);
 309
 310
 311
 312
 313         /*
 314          * Load any server-side extensions available here.
 315          */
 316         syslog(LOG_INFO, "Initializing server extensions");
 317
 318         initialise_modules(0);
 319
 320         eDebuglist[1] = getenv("CITADEL_LOGDEBUG");
 321         CtdlSetDebugLogFacilities(eDebuglist, 2);
 322
 323         /*
 324          * If we need host auth, start our chkpwd daemon.
 325          */
 326         if (config.c_auth_mode == AUTHMODE_HOST) {
 327                 start_chkpwd_daemon();
 328         }
 329
 330
 331         /*
 332          * check, whether we're fired up another time after a crash.
 333          * if, post an aide message, so the admin has a chance to react.
 334          */
 335         checkcrash ();
 336
 337
 338         /*
 339          * Now that we've bound the sockets, change to the Citadel user id and its
 340          * corresponding group ids
 341          */
 342         if (drop_root_perms) {
 343                 cdb_chmod_data();       /* make sure we own our data files */
 344
 345 #ifdef HAVE_GETPWUID_R
 346 #ifdef SOLARIS_GETPWUID
 347                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 348 #else // SOLARIS_GETPWUID
 349                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 350 #endif // SOLARIS_GETPWUID
 351 #else // HAVE_GETPWUID_R
 352                 pwp = NULL;
 353 #endif // HAVE_GETPWUID_R
 354
 355                 if (pwp == NULL)
 356                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s"
 357                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 358                                 strerror(errno));
 359                 else {
 360                         initgroups(pw.pw_name, pw.pw_gid);
 361                         if (setgid(pw.pw_gid))
 362                                 syslog(LOG_CRIT, "setgid(%ld): %s", (long)pw.pw_gid,
 363                                         strerror(errno));
 364                 }
 365                 syslog(LOG_INFO, "Changing uid to %ld", (long)CTDLUID);
 366                 if (setuid(CTDLUID) != 0) {
 367                         syslog(LOG_CRIT, "setuid() failed: %s", strerror(errno));
 368                 }
 369 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 370                 prctl(PR_SET_DUMPABLE, 1);
 371 #endif
 372         }
 373
 374         /* We want to check for idle sessions once per minute */
 375         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER, PRIO_CLEANUP + 1);
 376
 377         go_threading();
 378
 379         master_cleanup(exit_signal);
 380         return(0);
 381 }