citadel/server_main.c

   1 /*
   2  * citserver's main() function lives here.
   3  *
   4  * Copyright (c) 1987-2015 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 uid_t ctdluid = 0;
  30 const char *CitadelServiceUDS="citadel-UDS";
  31 const char *CitadelServiceTCP="citadel-TCP";
  32 void go_threading(void);
  33
  34 /*
  35  * Here's where it all begins.
  36  */
  37 int main(int argc, char **argv)
  38 {
  39         size_t basesize = 64;
  40         char facility[32];
  41         int a;                  /* General-purpose variables */
  42         struct passwd pw, *pwp = NULL;
  43         char pwbuf[SIZ];
  44         int drop_root_perms = 1;
  45         int relh=0;
  46         int home=0;
  47         int dbg=0;
  48         char relhome[PATH_MAX]="";
  49         char ctdldir[PATH_MAX]=CTDLDIR;
  50         int syslog_facility = LOG_DAEMON;
  51         const char *eDebuglist[] = {NULL, NULL};
  52         uid_t u = 0;
  53         struct passwd *p = 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:Dru:")) != 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                 /* -u tells the server what uid to run under... */
 112                 case 'u':
 113                         u = atoi(optarg);
 114                         if (u > 0) {
 115                                 ctdluid = u;
 116                         }
 117                         else {
 118                                 p = getpwnam(optarg);
 119                                 if (p) {
 120                                         u = p->pw_uid;
 121                                 }
 122                         }
 123                         if (u > 0) {
 124                                 ctdluid = u;
 125                         }
 126                         break;
 127
 128                 default:
 129                 /* any other parameter makes it crash and burn */
 130                         fprintf(stderr, "citserver: usage: "
 131                                         "citserver "
 132                                         "[-l LogFacility] "
 133                                         "[-d] [-D] [-r] "
 134                                         "[-u user] "
 135                                         "[-h HomeDir]\n"
 136                         );
 137                         exit(1);
 138         }
 139
 140         /* Last ditch effort to determine the user name ... if there's a user called "citadel" then use that */
 141         if (ctdluid == 0) {
 142                 p = getpwnam("citadel");
 143                 if (!p) {
 144                         p = getpwnam("bbs");
 145                 }
 146                 if (!p) {
 147                         p = getpwnam("guest");
 148                 }
 149                 if (p) {
 150                         u = p->pw_uid;
 151                 }
 152                 if (u > 0) {
 153                         ctdluid = u;
 154                 }
 155         }
 156
 157         if ((ctdluid == 0) && (drop_root_perms == 0)) {
 158                 fprintf(stderr, "citserver: cannot determine user to run as; please specify -r or -u options\n");
 159                 exit(CTDLEXIT_UNUSER);
 160         }
 161
 162         StartLibCitadel(basesize);
 163         openlog("citserver",
 164                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 165                 syslog_facility
 166         );
 167
 168         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 169         /* daemonize, if we were asked to */
 170         if (running_as_daemon) {
 171                 start_daemon(0);
 172                 drop_root_perms = 1;
 173         }
 174
 175 #if 0
 176  def HAVE_BACKTRACE
 177         bzero(&params, sizeof(params));
 178         params.filename = file_pid_paniclog;
 179         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 180         params.filep = fopen(file_pid_paniclog, "a+");
 181         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 182         params.dumpAllThreads = TRUE;
 183         params.useBacktraceSymbols = 1;
 184         params.signals[0]=SIGSEGV;
 185         params.signals[1]=SIGILL;
 186         params.signals[2]=SIGBUS;
 187         params.signals[3]=SIGABRT;
 188         eCrash_Init(&params);
 189         eCrash_RegisterThread("MasterThread", 0);
 190 #endif
 191
 192         /* Tell 'em who's in da house */
 193         syslog(LOG_NOTICE, " ");
 194         syslog(LOG_NOTICE, " ");
 195         syslog(LOG_NOTICE,
 196                 "*** Citadel server engine v%d.%02d (build %s) ***",
 197                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 198         syslog(LOG_NOTICE, "Copyright (C) 1987-2015 by the Citadel development team.");
 199         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 200                                         "General Public License.");
 201         syslog(LOG_NOTICE, " ");
 202         syslog(LOG_DEBUG, "Called as: %s", argv[0]);
 203         syslog(LOG_INFO, "%s", libcitadel_version_string());
 204
 205 #ifdef HAVE_RUN_DIR
 206         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 207
 208         if (stat(ctdl_run_dir, &filestats)==-1){
 209 #ifdef HAVE_GETPWUID_R
 210 #ifdef SOLARIS_GETPWUID
 211                 pwp = getpwuid_r(ctdluid, &pw, pwbuf, sizeof(pwbuf));
 212 #else // SOLARIS_GETPWUID
 213                 getpwuid_r(ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 214 #endif // SOLARIS_GETPWUID
 215 #else // HAVE_GETPWUID_R
 216                 pwp = NULL;
 217 #endif // HAVE_GETPWUID_R
 218
 219                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 220                         syslog(LOG_EMERG,
 221                                       "unable to create run directory [%s]: %s",
 222                                       ctdl_run_dir, strerror(errno));
 223
 224                 if (chown(ctdl_run_dir, ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 225                         syslog(LOG_EMERG,
 226                                       "unable to set the access rights for [%s]: %s",
 227                                       ctdl_run_dir, strerror(errno));
 228         }
 229
 230
 231 #endif
 232
 233         /* Initialize... */
 234         init_sysdep();
 235
 236         /*
 237          * Do non system dependent startup functions.
 238          */
 239         master_startup();
 240
 241         /*
 242          * Check that the control record is correct and place sensible values if it isn't
 243          */
 244         check_control();
 245
 246         /*
 247          * Run any upgrade entry points
 248          */
 249         syslog(LOG_INFO, "Upgrading modules.");
 250         upgrade_modules();
 251
 252 /*
 253  * Load the user for the masterCC or create them if they don't exist
 254  */
 255         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 256         {
 257                 /* User doesn't exist. We can't use create user here as the user number needs to be 0 */
 258                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 259                 CtdlPutUser(&masterCC.user);
 260                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /* Just to be safe */
 261         }
 262
 263         /*
 264          * Bind the server to a Unix-domain socket (user client access)
 265          */
 266         CtdlRegisterServiceHook(0,
 267                                 file_citadel_socket,
 268                                 citproto_begin_session,
 269                                 do_command_loop,
 270                                 do_async_loop,
 271                                 CitadelServiceUDS);
 272
 273         /*
 274          * Bind the server to a Unix-domain socket (admin client access)
 275          */
 276         CtdlRegisterServiceHook(0,
 277                                 file_citadel_admin_socket,
 278                                 citproto_begin_admin_session,
 279                                 do_command_loop,
 280                                 do_async_loop,
 281                                 CitadelServiceUDS);
 282         chmod(file_citadel_admin_socket, S_IRWXU);      /* for your eyes only */
 283
 284         /*
 285          * Bind the server to our favorite TCP port (usually 504).
 286          */
 287         CtdlRegisterServiceHook(CtdlGetConfigInt("c_port_number"),
 288                                 NULL,
 289                                 citproto_begin_session,
 290                                 do_command_loop,
 291                                 do_async_loop,
 292                                 CitadelServiceTCP);
 293
 294
 295
 296
 297         /*
 298          * Load any server-side extensions available here.
 299          */
 300         syslog(LOG_INFO, "Initializing server extensions");
 301
 302         initialise_modules(0);
 303
 304         eDebuglist[1] = getenv("CITADEL_LOGDEBUG");
 305         CtdlSetDebugLogFacilities(eDebuglist, 2);
 306
 307         /*
 308          * If we need host auth, start our chkpwd daemon.
 309          */
 310         if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_HOST) {
 311                 start_chkpwd_daemon();
 312         }
 313
 314
 315         /*
 316          * check, whether we're fired up another time after a crash.
 317          * if, post an aide message, so the admin has a chance to react.
 318          */
 319         checkcrash ();
 320
 321
 322         /*
 323          * Now that we've bound the sockets, change to the Citadel user id and its
 324          * corresponding group ids
 325          */
 326         if (drop_root_perms) {
 327                 cdb_chmod_data();       /* make sure we own our data files */
 328
 329 #ifdef HAVE_GETPWUID_R
 330 #ifdef SOLARIS_GETPWUID
 331                 pwp = getpwuid_r(ctdluid, &pw, pwbuf, sizeof(pwbuf));
 332 #else // SOLARIS_GETPWUID
 333                 getpwuid_r(ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 334 #endif // SOLARIS_GETPWUID
 335 #else // HAVE_GETPWUID_R
 336                 pwp = NULL;
 337 #endif // HAVE_GETPWUID_R
 338
 339                 if (pwp == NULL)
 340                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s"
 341                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 342                                 strerror(errno));
 343                 else {
 344                         initgroups(pw.pw_name, pw.pw_gid);
 345                         if (setgid(pw.pw_gid))
 346                                 syslog(LOG_CRIT, "setgid(%ld): %s", (long)pw.pw_gid,
 347                                         strerror(errno));
 348                 }
 349                 syslog(LOG_INFO, "Changing uid to %ld", (long)CTDLUID);
 350                 if (setuid(CTDLUID) != 0) {
 351                         syslog(LOG_CRIT, "setuid() failed: %s", strerror(errno));
 352                 }
 353 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 354                 prctl(PR_SET_DUMPABLE, 1);
 355 #endif
 356         }
 357
 358         /* We want to check for idle sessions once per minute */
 359         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER, PRIO_CLEANUP + 1);
 360
 361         go_threading();
 362
 363         master_cleanup(exit_signal);
 364         return(0);
 365 }