src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
   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 /**
  74  * The main() function of ngIRCd.
  75  * Here all starts: this function is called by the operating system loader,
  76  * it is the first portion of code executed of ngIRCd.
  77  * @param argc The number of arguments passed to ngIRCd on the command line.
  78  * @param argv An array containing all the arguments passed to ngIRCd.
  79  * @return Global exit code of ngIRCd, zero on success.
  80  */
  81 GLOBAL int
  82 main( int argc, const char *argv[] )
  83 {
  84         bool ok, configtest = false;
  85         bool NGIRCd_NoDaemon = false;
  86         int i;
  87         size_t n;
  88
  89 #if defined(DEBUG) && defined(HAVE_MTRACE)
  90         /* enable GNU libc memory tracing when running in debug mode
  91          * and functionality available */
  92         mtrace();
  93 #endif
  94
  95         umask( 0077 );
  96
  97         NGIRCd_SignalQuit = NGIRCd_SignalRestart = false;
  98         NGIRCd_Passive = false;
  99 #ifdef DEBUG
 100         NGIRCd_Debug = false;
 101 #endif
 102 #ifdef SNIFFER
 103         NGIRCd_Sniffer = false;
 104 #endif
 105         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 106         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 107
 108         Fill_Version( );
 109
 110         /* parse conmmand line */
 111         for( i = 1; i < argc; i++ )
 112         {
 113                 ok = false;
 114                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 115                 {
 116                         /* long option */
 117                         if( strcmp( argv[i], "--config" ) == 0 )
 118                         {
 119                                 if( i + 1 < argc )
 120                                 {
 121                                         /* Ok, there's an parameter left */
 122                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 123
 124                                         /* next parameter */
 125                                         i++; ok = true;
 126                                 }
 127                         }
 128                         if( strcmp( argv[i], "--configtest" ) == 0 )
 129                         {
 130                                 configtest = true;
 131                                 ok = true;
 132                         }
 133 #ifdef DEBUG
 134                         if( strcmp( argv[i], "--debug" ) == 0 )
 135                         {
 136                                 NGIRCd_Debug = true;
 137                                 ok = true;
 138                         }
 139 #endif
 140                         if( strcmp( argv[i], "--help" ) == 0 )
 141                         {
 142                                 Show_Version( );
 143                                 puts( "" ); Show_Help( ); puts( "" );
 144                                 exit( 1 );
 145                         }
 146                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 147                         {
 148                                 NGIRCd_NoDaemon = true;
 149                                 ok = true;
 150                         }
 151                         if( strcmp( argv[i], "--passive" ) == 0 )
 152                         {
 153                                 NGIRCd_Passive = true;
 154                                 ok = true;
 155                         }
 156 #ifdef SNIFFER
 157                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 158                         {
 159                                 NGIRCd_Sniffer = true;
 160                                 ok = true;
 161                         }
 162 #endif
 163                         if( strcmp( argv[i], "--version" ) == 0 )
 164                         {
 165                                 Show_Version( );
 166                                 exit( 1 );
 167                         }
 168                 }
 169                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 170                 {
 171                         /* short option */
 172                         for( n = 1; n < strlen( argv[i] ); n++ )
 173                         {
 174                                 ok = false;
 175 #ifdef DEBUG
 176                                 if (argv[i][n] == 'd') {
 177                                         NGIRCd_Debug = true;
 178                                         ok = true;
 179                                 }
 180 #endif
 181                                 if (argv[i][n] == 'f') {
 182                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 183                                         {
 184                                                 /* Ok, next character is a blank */
 185                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 186
 187                                                 /* go to the following parameter */
 188                                                 i++;
 189                                                 n = strlen( argv[i] );
 190                                                 ok = true;
 191                                         }
 192                                 }
 193
 194                                 if (argv[i][n] == 'h') {
 195                                         Show_Version();
 196                                         puts(""); Show_Help(); puts("");
 197                                         exit(1);
 198                                 }
 199
 200                                 if (argv[i][n] == 'n') {
 201                                         NGIRCd_NoDaemon = true;
 202                                         ok = true;
 203                                 }
 204                                 if (argv[i][n] == 'p') {
 205                                         NGIRCd_Passive = true;
 206                                         ok = true;
 207                                 }
 208 #ifdef SNIFFER
 209                                 if (argv[i][n] == 's') {
 210                                         NGIRCd_Sniffer = true;
 211                                         ok = true;
 212                                 }
 213 #endif
 214                                 if (argv[i][n] == 't') {
 215                                         configtest = true;
 216                                         ok = true;
 217                                 }
 218
 219                                 if (argv[i][n] == 'V') {
 220                                         Show_Version();
 221                                         exit(1);
 222                                 }
 223
 224                                 if (! ok) {
 225                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 226                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 227                                         exit( 1 );
 228                                 }
 229                         }
 230
 231                 }
 232                 if( ! ok )
 233                 {
 234                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 235                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 236                         exit( 1 );
 237                 }
 238         }
 239
 240         /* Debug-Level (for IRCs "VERSION" command) */
 241         NGIRCd_DebugLevel[0] = '\0';
 242 #ifdef DEBUG
 243         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 244 #endif
 245 #ifdef SNIFFER
 246         if( NGIRCd_Sniffer )
 247         {
 248                 NGIRCd_Debug = true;
 249                 strcpy( NGIRCd_DebugLevel, "2" );
 250         }
 251 #endif
 252
 253         if( configtest )
 254         {
 255                 Show_Version( ); puts( "" );
 256                 exit( Conf_Test( ));
 257         }
 258
 259         while( ! NGIRCd_SignalQuit )
 260         {
 261                 /* Initialize global variables */
 262                 NGIRCd_Start = time( NULL );
 263                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 264
 265                 NGIRCd_SignalRestart = false;
 266                 NGIRCd_SignalQuit = false;
 267
 268                 /* Initialize modules, part I */
 269                 Log_Init( ! NGIRCd_NoDaemon );
 270                 Conf_Init( );
 271
 272                 /* Initialize the "main program": chroot environment, user and
 273                  * group ID, ... */
 274                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 275                         Log(LOG_ALERT, "Fatal: Initialization failed");
 276                         exit(1);
 277                 }
 278
 279                 /* Initialize modules, part II: these functions are eventually
 280                  * called with already dropped privileges ... */
 281                 Channel_Init( );
 282                 Client_Init( );
 283 #ifdef ZEROCONF
 284                 Rendezvous_Init( );
 285 #endif
 286                 Conn_Init( );
 287
 288                 if (!io_library_init(CONNECTION_POOL)) {
 289                         Log(LOG_ALERT, "Fatal: Cannot initialize IO routines: %s", strerror(errno));
 290                         exit(1);
 291                 }
 292
 293                 if (!Signals_Init()) {
 294                         Log(LOG_ALERT, "Fatal: Could not set up signal handlers: %s", strerror(errno));
 295                         exit(1);
 296                 }
 297
 298                 /*
 299                  * create protocol and server identification.
 300                  * The syntax used by ngIRCd in PASS commands and the extended flags
 301                  * are described in doc/Protocol.txt
 302                  */
 303 #ifdef IRCPLUS
 304                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 305 #ifdef ZLIB
 306                 strcat( NGIRCd_ProtoID, "Z" );
 307 #endif
 308                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 309 #else
 310                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 311 #endif
 312                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 313 #ifdef ZLIB
 314                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 315 #endif
 316                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 317
 318                 Channel_InitPredefined( );
 319
 320                 if( Conn_InitListeners( ) < 1 )
 321                 {
 322                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 323                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 324                         Pidfile_Delete( );
 325                         exit( 1 );
 326                 }
 327
 328                 /* Hauptschleife */
 329                 Conn_Handler( );
 330
 331                 /* Alles abmelden */
 332                 Conn_Exit( );
 333 #ifdef ZEROCONF
 334                 Rendezvous_Exit( );
 335 #endif
 336                 Client_Exit( );
 337                 Channel_Exit( );
 338                 Log_Exit( );
 339         }
 340         Pidfile_Delete( );
 341
 342         return 0;
 343 } /* main */
 344
 345
 346 /**
 347  * Generate ngIRCd "version string".
 348  * This string is generated once and then stored in NGIRCd_Version for
 349  * further usage, for example by the IRC command VERSION and the --version
 350  * command line switch.
 351  */
 352 static void
 353 Fill_Version( void )
 354 {
 355         NGIRCd_VersionAddition[0] = '\0';
 356
 357 #ifdef SYSLOG
 358         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 359 #endif
 360 #ifdef ZLIB
 361         if( NGIRCd_VersionAddition[0] )
 362                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 363         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 364 #endif
 365 #ifdef SSL_SUPPORT
 366         if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 367         strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
 368 #endif
 369 #ifdef TCPWRAP
 370         if( NGIRCd_VersionAddition[0] )
 371                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 372         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 373 #endif
 374 #ifdef ZEROCONF
 375         if( NGIRCd_VersionAddition[0] )
 376                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 377         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 378 #endif
 379 #ifdef IDENTAUTH
 380         if( NGIRCd_VersionAddition[0] )
 381                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 382         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 383 #endif
 384 #ifdef PAM
 385         if (NGIRCd_VersionAddition[0])
 386                 strlcat(NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition);
 387         strlcat(NGIRCd_VersionAddition, "PAM", sizeof NGIRCd_VersionAddition);
 388 #endif
 389 #ifdef DEBUG
 390         if( NGIRCd_VersionAddition[0] )
 391                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 392         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 393 #endif
 394 #ifdef SNIFFER
 395         if( NGIRCd_VersionAddition[0] )
 396                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 397         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 398 #endif
 399 #ifdef STRICT_RFC
 400         if( NGIRCd_VersionAddition[0] )
 401                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 402         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 403 #endif
 404 #ifdef IRCPLUS
 405         if( NGIRCd_VersionAddition[0] )
 406                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 407         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 408 #endif
 409 #ifdef WANT_IPV6
 410         if (NGIRCd_VersionAddition[0])
 411                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 412         strlcat(NGIRCd_VersionAddition, "IPv6", sizeof(NGIRCd_VersionAddition));
 413 #endif
 414         if( NGIRCd_VersionAddition[0] )
 415                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 416
 417         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 418         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 419         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 420         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 421         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 422
 423         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 424                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 425         } /* Fill_Version */
 426
 427
 428 /**
 429  * Display copyright and version information of ngIRCd on the console.
 430  */
 431 static void
 432 Show_Version( void )
 433 {
 434         puts( NGIRCd_Version );
 435         puts( "Copyright (c)2001-2011 Alexander Barton (<alex@barton.de>) and Contributors." );
 436         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 437         puts( "This is free software; see the source for copying conditions. There is NO" );
 438         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 439 } /* Show_Version */
 440
 441
 442 /**
 443  * Display a short help text on the console.
 444  * This help depends on the configuration of the executable and only shows
 445  * options that are actually enabled.
 446  */
 447 static void
 448 Show_Help( void )
 449 {
 450 #ifdef DEBUG
 451         puts( "  -d, --debug        log extra debug messages" );
 452 #endif
 453         puts( "  -f, --config <f>   use file <f> as configuration file" );
 454         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 455         puts( "  -p, --passive      disable automatic connections to other servers" );
 456 #ifdef SNIFFER
 457         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 458 #endif
 459         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 460         puts( "  -V, --version      output version information and exit" );
 461         puts( "  -h, --help         display this help and exit" );
 462 } /* Show_Help */
 463
 464
 465 /**
 466  * Delete the file containing the process ID (PID).
 467  */
 468 static void
 469 Pidfile_Delete( void )
 470 {
 471         /* Pidfile configured? */
 472         if( ! Conf_PidFile[0] ) return;
 473
 474 #ifdef DEBUG
 475         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 476 #endif
 477
 478         if( unlink( Conf_PidFile ))
 479                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 480 } /* Pidfile_Delete */
 481
 482
 483 /**
 484  * Create the file containing the process ID of ngIRCd ("PID file").
 485  * @param pid The process ID to be stored in this file.
 486  */
 487 static void
 488 Pidfile_Create(pid_t pid)
 489 {
 490         int pidfd;
 491         char pidbuf[64];
 492         int len;
 493
 494         /* Pidfile configured? */
 495         if( ! Conf_PidFile[0] ) return;
 496
 497 #ifdef DEBUG
 498         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 499 #endif
 500
 501         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 502         if ( pidfd < 0 ) {
 503                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 504                 return;
 505         }
 506
 507         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 508         if (len < 0 || len >= (int)sizeof pidbuf) {
 509                 Log( LOG_ERR, "Error converting pid");
 510                 return;
 511         }
 512
 513         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 514                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 515
 516         if( close(pidfd) != 0 )
 517                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 518 } /* Pidfile_Create */
 519
 520
 521 /**
 522  * Redirect stdin, stdout and stderr to apropriate file handles.
 523  */
 524 static void
 525 Setup_FDStreams(int fd)
 526 {
 527         if (fd < 0)
 528                 return;
 529
 530         fflush(stdout);
 531         fflush(stderr);
 532
 533         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 534         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 535 } /* Setup_FDStreams */
 536
 537
 538 static bool
 539 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 540 {
 541         struct passwd *pwd;
 542
 543 #ifdef __CYGWIN__
 544         /* Cygwin kludge.
 545          * It can return EINVAL instead of EPERM
 546          * so, if we are already unprivileged,
 547          * use id of current user.
 548          */
 549         if (geteuid() && getuid()) {
 550                 *uid = getuid();
 551                 *gid = getgid();
 552                 return true;
 553         }
 554 #endif
 555
 556         pwd = getpwnam("nobody");
 557         if (!pwd) return false;
 558
 559         if ( !pwd->pw_uid || !pwd->pw_gid)
 560                 return false;
 561
 562         *uid = pwd->pw_uid;
 563         *gid = pwd->pw_gid;
 564         endpwent();
 565
 566         return true;
 567 }
 568
 569
 570 static bool
 571 NGIRCd_Init( bool NGIRCd_NoDaemon )
 572 {
 573         static bool initialized;
 574         bool chrooted = false;
 575         struct passwd *pwd;
 576         struct group *grp;
 577         int real_errno, fd = -1;
 578         pid_t pid;
 579
 580         if (initialized)
 581                 return true;
 582
 583         if (!NGIRCd_NoDaemon) {
 584                 /* open /dev/null before chroot() */
 585                 fd = open( "/dev/null", O_RDWR);
 586                 if (fd < 0)
 587                         Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 588         }
 589
 590         if (!ConnSSL_InitLibrary())
 591                 Log(LOG_WARNING,
 592                     "Warning: Error during SSL initialization, continuing ...");
 593
 594         if( Conf_Chroot[0] ) {
 595                 if( chdir( Conf_Chroot ) != 0 ) {
 596                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 597                         goto out;
 598                 }
 599
 600                 if( chroot( Conf_Chroot ) != 0 ) {
 601                         if (errno != EPERM) {
 602                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 603                                                                 Conf_Chroot, strerror( errno ));
 604                                 goto out;
 605                         }
 606                 } else {
 607                         chrooted = true;
 608                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 609                 }
 610         }
 611
 612         if (Conf_UID == 0) {
 613                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 614
 615                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 616                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 617                                         errno ? strerror(errno) : "not found" );
 618                         goto out;
 619                 }
 620         }
 621
 622         if (getgid() != Conf_GID) {
 623                 /* Change group ID */
 624                 if (setgid(Conf_GID) != 0) {
 625                         real_errno = errno;
 626                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 627                         if (real_errno != EPERM)
 628                                 goto out;
 629                 }
 630         }
 631
 632         if (getuid() != Conf_UID) {
 633                 /* Change user ID */
 634                 if (setuid(Conf_UID) != 0) {
 635                         real_errno = errno;
 636                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 637                         if (real_errno != EPERM)
 638                                 goto out;
 639                 }
 640         }
 641
 642         initialized = true;
 643
 644         /* Normally a child process is forked which isn't any longer
 645          * connected to ther controlling terminal. Use "--nodaemon"
 646          * to disable this "daemon mode" (useful for debugging). */
 647         if ( ! NGIRCd_NoDaemon ) {
 648                 pid = fork( );
 649                 if( pid > 0 ) {
 650                         /* "Old" process: exit. */
 651                         exit( 0 );
 652                 }
 653                 if( pid < 0 ) {
 654                         /* Error!? */
 655                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 656                                                                 PACKAGE_NAME, strerror( errno ));
 657                         exit( 1 );
 658                 }
 659
 660                 /* New child process */
 661 #ifndef NeXT
 662                 (void)setsid( );
 663 #else
 664                 setpgrp(0, getpid());
 665 #endif
 666                 if (chdir( "/" ) != 0)
 667                         Log(LOG_ERR, "Can't change directory to '/': %s",
 668                                      strerror(errno));
 669
 670                 /* Detach stdin, stdout and stderr */
 671                 Setup_FDStreams(fd);
 672                 if (fd > 2) {
 673                         close(fd);
 674                         fd = -1;
 675                 }
 676         }
 677         pid = getpid();
 678
 679         Pidfile_Create( pid );
 680
 681         /* Check UID/GID we are running as, can be different from values
 682          * configured (e. g. if we were already started with a UID>0. */
 683         Conf_UID = getuid();
 684         Conf_GID = getgid();
 685
 686         pwd = getpwuid( Conf_UID );
 687         grp = getgrgid( Conf_GID );
 688
 689         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 690                                 pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 691                                 grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 692
 693         if (chrooted) {
 694                 Log(LOG_INFO, "Running with root directory \"%s\".",
 695                     Conf_Chroot );
 696                 return true;
 697         } else
 698                 Log(LOG_INFO, "Not running with changed root directory.");
 699
 700         /* Change working directory to home directory of the user
 701          * we are running as (only when running in daemon mode and not in chroot) */
 702
 703         if (pwd) {
 704                 if (!NGIRCd_NoDaemon ) {
 705                         if( chdir( pwd->pw_dir ) == 0 )
 706                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 707                         else
 708                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
 709                                                                 pwd->pw_dir, strerror( errno ));
 710                 }
 711         } else {
 712                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 713         }
 714
 715         return true;
 716  out:
 717         if (fd > 2)
 718                 close(fd);
 719         return false;
 720 }
 721
 722
 723 /* -eof- */