src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2010 Alexander Barton (alex@barton.de).
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12
  13 #include "portab.h"
  14
  15 /**
  16  * @file
  17  * The main program, including the C function main() which is called
  18  * by the loader of the operating system.
  19  */
  20
  21 #include "imp.h"
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <signal.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <time.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33 #include <pwd.h>
  34 #include <grp.h>
  35
  36 #if defined(DEBUG) && defined(HAVE_MTRACE)
  37 #include <mcheck.h>
  38 #endif
  39
  40 #include "defines.h"
  41 #include "conn.h"
  42 #include "conf-ssl.h"
  43 #include "channel.h"
  44 #include "conf.h"
  45 #include "lists.h"
  46 #include "log.h"
  47 #include "parse.h"
  48 #include "sighandlers.h"
  49 #include "io.h"
  50 #include "irc.h"
  51
  52 #ifdef ZEROCONF
  53 #include "rendezvous.h"
  54 #endif
  55
  56 #include "exp.h"
  57 #include "ngircd.h"
  58
  59
  60 static void Show_Version PARAMS(( void ));
  61 static void Show_Help PARAMS(( void ));
  62
  63 static void Pidfile_Create PARAMS(( pid_t pid ));
  64 static void Pidfile_Delete PARAMS(( void ));
  65
  66 static void Fill_Version PARAMS(( void ));
  67
  68 static void Setup_FDStreams PARAMS(( int fd ));
  69
  70 static bool NGIRCd_Init PARAMS(( bool ));
  71
  72 /**
  73  * The main() function of ngIRCd.
  74  * Here all starts: this function is called by the operating system loader,
  75  * it is the first portion of code executed of ngIRCd.
  76  * @param argc The number of arguments passed to ngIRCd on the command line.
  77  * @param argv An array containing all the arguments passed to ngIRCd.
  78  * @return Global exit code of ngIRCd, zero on success.
  79  */
  80 GLOBAL int
  81 main( int argc, const char *argv[] )
  82 {
  83         bool ok, configtest = false;
  84         bool NGIRCd_NoDaemon = false;
  85         int i;
  86         size_t n;
  87
  88 #if defined(DEBUG) && defined(HAVE_MTRACE)
  89         /* enable GNU libc memory tracing when running in debug mode
  90          * and functionality available */
  91         mtrace();
  92 #endif
  93
  94         umask( 0077 );
  95
  96         NGIRCd_SignalQuit = NGIRCd_SignalRestart = false;
  97         NGIRCd_Passive = false;
  98 #ifdef DEBUG
  99         NGIRCd_Debug = false;
 100 #endif
 101 #ifdef SNIFFER
 102         NGIRCd_Sniffer = false;
 103 #endif
 104         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 105         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 106
 107         Fill_Version( );
 108
 109         /* parse conmmand line */
 110         for( i = 1; i < argc; i++ )
 111         {
 112                 ok = false;
 113                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 114                 {
 115                         /* long option */
 116                         if( strcmp( argv[i], "--config" ) == 0 )
 117                         {
 118                                 if( i + 1 < argc )
 119                                 {
 120                                         /* Ok, there's an parameter left */
 121                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 122
 123                                         /* next parameter */
 124                                         i++; ok = true;
 125                                 }
 126                         }
 127                         if( strcmp( argv[i], "--configtest" ) == 0 )
 128                         {
 129                                 configtest = true;
 130                                 ok = true;
 131                         }
 132 #ifdef DEBUG
 133                         if( strcmp( argv[i], "--debug" ) == 0 )
 134                         {
 135                                 NGIRCd_Debug = true;
 136                                 ok = true;
 137                         }
 138 #endif
 139                         if( strcmp( argv[i], "--help" ) == 0 )
 140                         {
 141                                 Show_Version( );
 142                                 puts( "" ); Show_Help( ); puts( "" );
 143                                 exit( 1 );
 144                         }
 145                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 146                         {
 147                                 NGIRCd_NoDaemon = true;
 148                                 ok = true;
 149                         }
 150                         if( strcmp( argv[i], "--passive" ) == 0 )
 151                         {
 152                                 NGIRCd_Passive = true;
 153                                 ok = true;
 154                         }
 155 #ifdef SNIFFER
 156                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 157                         {
 158                                 NGIRCd_Sniffer = true;
 159                                 ok = true;
 160                         }
 161 #endif
 162                         if( strcmp( argv[i], "--version" ) == 0 )
 163                         {
 164                                 Show_Version( );
 165                                 exit( 1 );
 166                         }
 167                 }
 168                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 169                 {
 170                         /* short option */
 171                         for( n = 1; n < strlen( argv[i] ); n++ )
 172                         {
 173                                 ok = false;
 174 #ifdef DEBUG
 175                                 if (argv[i][n] == 'd') {
 176                                         NGIRCd_Debug = true;
 177                                         ok = true;
 178                                 }
 179 #endif
 180                                 if (argv[i][n] == 'f') {
 181                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 182                                         {
 183                                                 /* Ok, next character is a blank */
 184                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 185
 186                                                 /* go to the following parameter */
 187                                                 i++;
 188                                                 n = strlen( argv[i] );
 189                                                 ok = true;
 190                                         }
 191                                 }
 192
 193                                 if (argv[i][n] == 'h') {
 194                                         Show_Version();
 195                                         puts(""); Show_Help(); puts("");
 196                                         exit(1);
 197                                 }
 198
 199                                 if (argv[i][n] == 'n') {
 200                                         NGIRCd_NoDaemon = true;
 201                                         ok = true;
 202                                 }
 203                                 if (argv[i][n] == 'p') {
 204                                         NGIRCd_Passive = true;
 205                                         ok = true;
 206                                 }
 207 #ifdef SNIFFER
 208                                 if (argv[i][n] == 's') {
 209                                         NGIRCd_Sniffer = true;
 210                                         ok = true;
 211                                 }
 212 #endif
 213                                 if (argv[i][n] == 't') {
 214                                         configtest = true;
 215                                         ok = true;
 216                                 }
 217
 218                                 if (argv[i][n] == 'V') {
 219                                         Show_Version();
 220                                         exit(1);
 221                                 }
 222
 223                                 if (! ok) {
 224                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 225                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 226                                         exit( 1 );
 227                                 }
 228                         }
 229
 230                 }
 231                 if( ! ok )
 232                 {
 233                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 234                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 235                         exit( 1 );
 236                 }
 237         }
 238
 239         /* Debug-Level (for IRCs "VERSION" command) */
 240         NGIRCd_DebugLevel[0] = '\0';
 241 #ifdef DEBUG
 242         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 243 #endif
 244 #ifdef SNIFFER
 245         if( NGIRCd_Sniffer )
 246         {
 247                 NGIRCd_Debug = true;
 248                 strcpy( NGIRCd_DebugLevel, "2" );
 249         }
 250 #endif
 251
 252         if( configtest )
 253         {
 254                 Show_Version( ); puts( "" );
 255                 exit( Conf_Test( ));
 256         }
 257
 258         while( ! NGIRCd_SignalQuit )
 259         {
 260                 /* Initialize global variables */
 261                 NGIRCd_Start = time( NULL );
 262                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 263
 264                 NGIRCd_SignalRestart = false;
 265                 NGIRCd_SignalQuit = false;
 266
 267                 /* Initialize modules, part I */
 268                 Log_Init( ! NGIRCd_NoDaemon );
 269                 Conf_Init( );
 270
 271                 /* Initialize the "main program": chroot environment, user and
 272                  * group ID, ... */
 273                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 274                         Log(LOG_ALERT, "Fatal: Initialization failed");
 275                         exit(1);
 276                 }
 277
 278                 /* Initialize modules, part II: these functions are eventually
 279                  * called with already dropped privileges ... */
 280                 Channel_Init( );
 281                 Client_Init( );
 282 #ifdef ZEROCONF
 283                 Rendezvous_Init( );
 284 #endif
 285                 Conn_Init( );
 286
 287 #ifdef DEBUG
 288                 /* Redirect stderr handle to "error file" for debugging
 289                  * when not running in "no daemon" mode: */
 290                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 291 #endif
 292                 if (!io_library_init(CONNECTION_POOL)) {
 293                         Log(LOG_ALERT, "Fatal: Cannot initialize IO routines: %s", strerror(errno));
 294                         exit(1);
 295                 }
 296
 297                 if (!Signals_Init()) {
 298                         Log(LOG_ALERT, "Fatal: Could not set up signal handlers: %s", strerror(errno));
 299                         exit(1);
 300                 }
 301
 302                 /*
 303                  * create protocol and server identification.
 304                  * The syntax used by ngIRCd in PASS commands and the extended flags
 305                  * are described in doc/Protocol.txt
 306                  */
 307 #ifdef IRCPLUS
 308                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 309 #ifdef ZLIB
 310                 strcat( NGIRCd_ProtoID, "Z" );
 311 #endif
 312                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 313 #else
 314                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 315 #endif
 316                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 317 #ifdef ZLIB
 318                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 319 #endif
 320                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 321
 322                 Channel_InitPredefined( );
 323
 324                 if( Conn_InitListeners( ) < 1 )
 325                 {
 326                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 327                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 328                         Pidfile_Delete( );
 329                         exit( 1 );
 330                 }
 331
 332                 /* Hauptschleife */
 333                 Conn_Handler( );
 334
 335                 /* Alles abmelden */
 336                 Conn_Exit( );
 337 #ifdef ZEROCONF
 338                 Rendezvous_Exit( );
 339 #endif
 340                 Client_Exit( );
 341                 Channel_Exit( );
 342                 Log_Exit( );
 343         }
 344         Pidfile_Delete( );
 345
 346         return 0;
 347 } /* main */
 348
 349
 350 /**
 351  * Generate ngIRCd "version string".
 352  * This string is generated once and then stored in NGIRCd_Version for
 353  * further usage, for example by the IRC command VERSION and the --version
 354  * command line switch.
 355  */
 356 static void
 357 Fill_Version( void )
 358 {
 359         NGIRCd_VersionAddition[0] = '\0';
 360
 361 #ifdef SYSLOG
 362         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 363 #endif
 364 #ifdef ZLIB
 365         if( NGIRCd_VersionAddition[0] )
 366                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 367         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 368 #endif
 369 #ifdef SSL_SUPPORT
 370         if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 371         strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
 372 #endif
 373 #ifdef TCPWRAP
 374         if( NGIRCd_VersionAddition[0] )
 375                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 376         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 377 #endif
 378 #ifdef ZEROCONF
 379         if( NGIRCd_VersionAddition[0] )
 380                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 381         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 382 #endif
 383 #ifdef IDENTAUTH
 384         if( NGIRCd_VersionAddition[0] )
 385                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 386         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 387 #endif
 388 #ifdef PAM
 389         if (NGIRCd_VersionAddition[0])
 390                 strlcat(NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition);
 391         strlcat(NGIRCd_VersionAddition, "PAM", sizeof NGIRCd_VersionAddition);
 392 #endif
 393 #ifdef DEBUG
 394         if( NGIRCd_VersionAddition[0] )
 395                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 396         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 397 #endif
 398 #ifdef SNIFFER
 399         if( NGIRCd_VersionAddition[0] )
 400                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 401         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 402 #endif
 403 #ifdef STRICT_RFC
 404         if( NGIRCd_VersionAddition[0] )
 405                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 406         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 407 #endif
 408 #ifdef IRCPLUS
 409         if( NGIRCd_VersionAddition[0] )
 410                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 411         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 412 #endif
 413 #ifdef WANT_IPV6
 414         if (NGIRCd_VersionAddition[0])
 415                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 416         strlcat(NGIRCd_VersionAddition, "IPv6", sizeof(NGIRCd_VersionAddition));
 417 #endif
 418         if( NGIRCd_VersionAddition[0] )
 419                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 420
 421         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 422         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 423         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 424         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 425         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 426
 427         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 428                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 429         } /* Fill_Version */
 430
 431
 432 /**
 433  * Display copyright and version information of ngIRCd on the console.
 434  */
 435 static void
 436 Show_Version( void )
 437 {
 438         puts( NGIRCd_Version );
 439         puts( "Copyright (c)2001-2010 Alexander Barton (<alex@barton.de>) and Contributors." );
 440         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 441         puts( "This is free software; see the source for copying conditions. There is NO" );
 442         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 443 } /* Show_Version */
 444
 445
 446 /**
 447  * Display a short help text on the console.
 448  * This help depends on the configuration of the executable and only shows
 449  * options that are actually enabled.
 450  */
 451 static void
 452 Show_Help( void )
 453 {
 454 #ifdef DEBUG
 455         puts( "  -d, --debug        log extra debug messages" );
 456 #endif
 457         puts( "  -f, --config <f>   use file <f> as configuration file" );
 458         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 459         puts( "  -p, --passive      disable automatic connections to other servers" );
 460 #ifdef SNIFFER
 461         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 462 #endif
 463         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 464         puts( "  -V, --version      output version information and exit" );
 465         puts( "  -h, --help         display this help and exit" );
 466 } /* Show_Help */
 467
 468
 469 /**
 470  * Delete the file containing the process ID (PID).
 471  */
 472 static void
 473 Pidfile_Delete( void )
 474 {
 475         /* Pidfile configured? */
 476         if( ! Conf_PidFile[0] ) return;
 477
 478 #ifdef DEBUG
 479         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 480 #endif
 481
 482         if( unlink( Conf_PidFile ))
 483                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 484 } /* Pidfile_Delete */
 485
 486
 487 /**
 488  * Create the file containing the process ID of ngIRCd ("PID file").
 489  * @param pid The process ID to be stored in this file.
 490  */
 491 static void
 492 Pidfile_Create(pid_t pid)
 493 {
 494         int pidfd;
 495         char pidbuf[64];
 496         int len;
 497
 498         /* Pidfile configured? */
 499         if( ! Conf_PidFile[0] ) return;
 500
 501 #ifdef DEBUG
 502         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 503 #endif
 504
 505         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 506         if ( pidfd < 0 ) {
 507                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 508                 return;
 509         }
 510
 511         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 512         if (len < 0 || len >= (int)sizeof pidbuf) {
 513                 Log( LOG_ERR, "Error converting pid");
 514                 return;
 515         }
 516
 517         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 518                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 519
 520         if( close(pidfd) != 0 )
 521                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 522 } /* Pidfile_Create */
 523
 524
 525 /**
 526  * Redirect stdin, stdout and stderr to apropriate file handles.
 527  */
 528 static void
 529 Setup_FDStreams(int fd)
 530 {
 531         if (fd < 0)
 532                 return;
 533
 534         fflush(stdout);
 535         fflush(stderr);
 536
 537         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 538         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 539 } /* Setup_FDStreams */
 540
 541
 542 static bool
 543 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 544 {
 545         struct passwd *pwd;
 546
 547 #ifdef __CYGWIN__
 548         /* Cygwin kludge.
 549          * It can return EINVAL instead of EPERM
 550          * so, if we are already unprivileged,
 551          * use id of current user.
 552          */
 553         if (geteuid() && getuid()) {
 554                 *uid = getuid();
 555                 *gid = getgid();
 556                 return true;
 557         }
 558 #endif
 559
 560         pwd = getpwnam("nobody");
 561         if (!pwd) return false;
 562
 563         if ( !pwd->pw_uid || !pwd->pw_gid)
 564                 return false;
 565
 566         *uid = pwd->pw_uid;
 567         *gid = pwd->pw_gid;
 568         endpwent();
 569
 570         return true;
 571 }
 572
 573
 574 static bool
 575 NGIRCd_Init( bool NGIRCd_NoDaemon )
 576 {
 577         static bool initialized;
 578         bool chrooted = false;
 579         struct passwd *pwd;
 580         struct group *grp;
 581         int real_errno, fd = -1;
 582         pid_t pid;
 583
 584         if (initialized)
 585                 return true;
 586
 587         if (!NGIRCd_NoDaemon) {
 588                 /* open /dev/null before chroot() */
 589                 fd = open( "/dev/null", O_RDWR);
 590                 if (fd < 0)
 591                         Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 592         }
 593
 594         if (!ConnSSL_InitLibrary())
 595                 Log(LOG_WARNING,
 596                     "Warning: Error during SSL initialization, continuing ...");
 597
 598         if( Conf_Chroot[0] ) {
 599                 if( chdir( Conf_Chroot ) != 0 ) {
 600                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 601                         goto out;
 602                 }
 603
 604                 if( chroot( Conf_Chroot ) != 0 ) {
 605                         if (errno != EPERM) {
 606                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 607                                                                 Conf_Chroot, strerror( errno ));
 608                                 goto out;
 609                         }
 610                 } else {
 611                         chrooted = true;
 612                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 613                 }
 614         }
 615
 616         if (Conf_UID == 0) {
 617                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 618
 619                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 620                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 621                                         errno ? strerror(errno) : "not found" );
 622                         goto out;
 623                 }
 624         }
 625
 626         if (getgid() != Conf_GID) {
 627                 /* Change group ID */
 628                 if (setgid(Conf_GID) != 0) {
 629                         real_errno = errno;
 630                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 631                         if (real_errno != EPERM)
 632                                 goto out;
 633                 }
 634         }
 635
 636         if (getuid() != Conf_UID) {
 637                 /* Change user ID */
 638                 if (setuid(Conf_UID) != 0) {
 639                         real_errno = errno;
 640                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 641                         if (real_errno != EPERM)
 642                                 goto out;
 643                 }
 644         }
 645
 646         initialized = true;
 647
 648         /* Normally a child process is forked which isn't any longer
 649          * connected to ther controlling terminal. Use "--nodaemon"
 650          * to disable this "daemon mode" (useful for debugging). */
 651         if ( ! NGIRCd_NoDaemon ) {
 652                 pid = fork( );
 653                 if( pid > 0 ) {
 654                         /* "Old" process: exit. */
 655                         exit( 0 );
 656                 }
 657                 if( pid < 0 ) {
 658                         /* Error!? */
 659                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 660                                                                 PACKAGE_NAME, strerror( errno ));
 661                         exit( 1 );
 662                 }
 663
 664                 /* New child process */
 665 #ifndef NeXT
 666                 (void)setsid( );
 667 #else
 668                 setpgrp(0, getpid());
 669 #endif
 670                 if (chdir( "/" ) != 0)
 671                         Log(LOG_ERR, "Can't change directory to '/': %s",
 672                                      strerror(errno));
 673
 674                 /* Detach stdin, stdout and stderr */
 675                 Setup_FDStreams(fd);
 676                 if (fd > 2) {
 677                         close(fd);
 678                         fd = -1;
 679                 }
 680         }
 681         pid = getpid();
 682
 683         Pidfile_Create( pid );
 684
 685         /* Check UID/GID we are running as, can be different from values
 686          * configured (e. g. if we were already started with a UID>0. */
 687         Conf_UID = getuid();
 688         Conf_GID = getgid();
 689
 690         pwd = getpwuid( Conf_UID );
 691         grp = getgrgid( Conf_GID );
 692
 693         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 694                                 pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 695                                 grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 696
 697         if (chrooted) {
 698                 Log(LOG_INFO, "Running with root directory \"%s\".",
 699                     Conf_Chroot );
 700                 return true;
 701         } else
 702                 Log(LOG_INFO, "Not running with changed root directory.");
 703
 704         /* Change working directory to home directory of the user
 705          * we are running as (only when running in daemon mode and not in chroot) */
 706
 707         if (pwd) {
 708                 if (!NGIRCd_NoDaemon ) {
 709                         if( chdir( pwd->pw_dir ) == 0 )
 710                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 711                         else
 712                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
 713                                                                 pwd->pw_dir, strerror( errno ));
 714                 }
 715         } else {
 716                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 717         }
 718
 719         return true;
 720  out:
 721         if (fd > 2)
 722                 close(fd);
 723         return false;
 724 }
 725
 726 /* -eof- */