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 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * The main program, including the C function main() which is called
  17  * by the loader of the operating system.
  18  */
  19
  20 #include "imp.h"
  21 #include <assert.h>
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <signal.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <time.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <fcntl.h>
  32 #include <pwd.h>
  33 #include <grp.h>
  34
  35 #if defined(DEBUG) && defined(HAVE_MTRACE)
  36 #include <mcheck.h>
  37 #endif
  38
  39 #include "defines.h"
  40 #include "conn.h"
  41 #include "conf-ssl.h"
  42 #include "channel.h"
  43 #include "conf.h"
  44 #include "lists.h"
  45 #include "log.h"
  46 #include "parse.h"
  47 #include "sighandlers.h"
  48 #include "io.h"
  49 #include "irc.h"
  50
  51 #include "exp.h"
  52 #include "ngircd.h"
  53
  54
  55 static void Show_Version PARAMS(( void ));
  56 static void Show_Help PARAMS(( void ));
  57
  58 static void Pidfile_Create PARAMS(( pid_t pid ));
  59 static void Pidfile_Delete PARAMS(( void ));
  60
  61 static void Fill_Version PARAMS(( void ));
  62
  63 static void Setup_FDStreams PARAMS(( int fd ));
  64
  65 static bool NGIRCd_Init PARAMS(( bool ));
  66
  67
  68 /**
  69  * The main() function of ngIRCd.
  70  *
  71  * Here all starts: this function is called by the operating system loader,
  72  * it is the first portion of code executed of ngIRCd.
  73  *
  74  * @param argc  The number of arguments passed to ngIRCd on the command line.
  75  * @param argv  An array containing all the arguments passed to ngIRCd.
  76  * @return      Global exit code of ngIRCd, zero on success.
  77  */
  78 GLOBAL int
  79 main( int argc, const char *argv[] )
  80 {
  81         bool ok, configtest = false;
  82         bool NGIRCd_NoDaemon = false;
  83         int i;
  84         size_t n;
  85
  86 #if defined(DEBUG) && defined(HAVE_MTRACE)
  87         /* enable GNU libc memory tracing when running in debug mode
  88          * and functionality available */
  89         mtrace();
  90 #endif
  91
  92         umask( 0077 );
  93
  94         NGIRCd_SignalQuit = NGIRCd_SignalRestart = false;
  95         NGIRCd_Passive = false;
  96 #ifdef DEBUG
  97         NGIRCd_Debug = false;
  98 #endif
  99 #ifdef SNIFFER
 100         NGIRCd_Sniffer = false;
 101 #endif
 102         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 103         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 104
 105         Fill_Version( );
 106
 107         /* parse conmmand line */
 108         for( i = 1; i < argc; i++ )
 109         {
 110                 ok = false;
 111                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 112                 {
 113                         /* long option */
 114                         if( strcmp( argv[i], "--config" ) == 0 )
 115                         {
 116                                 if( i + 1 < argc )
 117                                 {
 118                                         /* Ok, there's an parameter left */
 119                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 120
 121                                         /* next parameter */
 122                                         i++; ok = true;
 123                                 }
 124                         }
 125                         if( strcmp( argv[i], "--configtest" ) == 0 )
 126                         {
 127                                 configtest = true;
 128                                 ok = true;
 129                         }
 130 #ifdef DEBUG
 131                         if( strcmp( argv[i], "--debug" ) == 0 )
 132                         {
 133                                 NGIRCd_Debug = true;
 134                                 ok = true;
 135                         }
 136 #endif
 137                         if( strcmp( argv[i], "--help" ) == 0 )
 138                         {
 139                                 Show_Version( );
 140                                 puts( "" ); Show_Help( ); puts( "" );
 141                                 exit( 1 );
 142                         }
 143                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 144                         {
 145                                 NGIRCd_NoDaemon = true;
 146                                 ok = true;
 147                         }
 148                         if( strcmp( argv[i], "--passive" ) == 0 )
 149                         {
 150                                 NGIRCd_Passive = true;
 151                                 ok = true;
 152                         }
 153 #ifdef SNIFFER
 154                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 155                         {
 156                                 NGIRCd_Sniffer = true;
 157                                 ok = true;
 158                         }
 159 #endif
 160                         if( strcmp( argv[i], "--version" ) == 0 )
 161                         {
 162                                 Show_Version( );
 163                                 exit( 1 );
 164                         }
 165                 }
 166                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 167                 {
 168                         /* short option */
 169                         for( n = 1; n < strlen( argv[i] ); n++ )
 170                         {
 171                                 ok = false;
 172 #ifdef DEBUG
 173                                 if (argv[i][n] == 'd') {
 174                                         NGIRCd_Debug = true;
 175                                         ok = true;
 176                                 }
 177 #endif
 178                                 if (argv[i][n] == 'f') {
 179                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 180                                         {
 181                                                 /* Ok, next character is a blank */
 182                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 183
 184                                                 /* go to the following parameter */
 185                                                 i++;
 186                                                 n = strlen( argv[i] );
 187                                                 ok = true;
 188                                         }
 189                                 }
 190
 191                                 if (argv[i][n] == 'h') {
 192                                         Show_Version();
 193                                         puts(""); Show_Help(); puts("");
 194                                         exit(1);
 195                                 }
 196
 197                                 if (argv[i][n] == 'n') {
 198                                         NGIRCd_NoDaemon = true;
 199                                         ok = true;
 200                                 }
 201                                 if (argv[i][n] == 'p') {
 202                                         NGIRCd_Passive = true;
 203                                         ok = true;
 204                                 }
 205 #ifdef SNIFFER
 206                                 if (argv[i][n] == 's') {
 207                                         NGIRCd_Sniffer = true;
 208                                         ok = true;
 209                                 }
 210 #endif
 211                                 if (argv[i][n] == 't') {
 212                                         configtest = true;
 213                                         ok = true;
 214                                 }
 215
 216                                 if (argv[i][n] == 'V') {
 217                                         Show_Version();
 218                                         exit(1);
 219                                 }
 220
 221                                 if (! ok) {
 222                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 223                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 224                                         exit( 1 );
 225                                 }
 226                         }
 227
 228                 }
 229                 if( ! ok )
 230                 {
 231                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 232                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 233                         exit( 1 );
 234                 }
 235         }
 236
 237         /* Debug level for "VERSION" command */
 238         NGIRCd_DebugLevel[0] = '\0';
 239 #ifdef DEBUG
 240         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 241 #endif
 242 #ifdef SNIFFER
 243         if( NGIRCd_Sniffer )
 244         {
 245                 NGIRCd_Debug = true;
 246                 strcpy( NGIRCd_DebugLevel, "2" );
 247         }
 248 #endif
 249
 250         if( configtest )
 251         {
 252                 Show_Version( ); puts( "" );
 253                 exit( Conf_Test( ));
 254         }
 255
 256         while( ! NGIRCd_SignalQuit )
 257         {
 258                 /* Initialize global variables */
 259                 NGIRCd_Start = time( NULL );
 260                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 261
 262                 NGIRCd_SignalRestart = false;
 263                 NGIRCd_SignalQuit = false;
 264
 265                 /* Initialize modules, part I */
 266                 Log_Init( ! NGIRCd_NoDaemon );
 267                 Conf_Init( );
 268
 269                 /* Initialize the "main program": chroot environment, user and
 270                  * group ID, ... */
 271                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 272                         Log(LOG_ALERT, "Fatal: Initialization failed");
 273                         exit(1);
 274                 }
 275
 276                 /* Initialize modules, part II: these functions are eventually
 277                  * called with already dropped privileges ... */
 278                 Channel_Init( );
 279                 Client_Init( );
 280                 Conn_Init( );
 281
 282                 if (!io_library_init(CONNECTION_POOL)) {
 283                         Log(LOG_ALERT, "Fatal: Cannot initialize IO routines: %s", strerror(errno));
 284                         exit(1);
 285                 }
 286
 287                 if (!Signals_Init()) {
 288                         Log(LOG_ALERT, "Fatal: Could not set up signal handlers: %s", strerror(errno));
 289                         exit(1);
 290                 }
 291
 292                 /* Create protocol and server identification. The syntax
 293                  * used by ngIRCd in PASS commands and the known "extended
 294                  * flags" are described in doc/Protocol.txt. */
 295 #ifdef IRCPLUS
 296                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 297 #ifdef ZLIB
 298                 strcat( NGIRCd_ProtoID, "Z" );
 299 #endif
 300                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 301 #else
 302                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 303 #endif
 304                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 305 #ifdef ZLIB
 306                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 307 #endif
 308                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 309
 310                 Channel_InitPredefined( );
 311
 312                 if( Conn_InitListeners( ) < 1 )
 313                 {
 314                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 315                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 316                         Pidfile_Delete( );
 317                         exit( 1 );
 318                 }
 319
 320                 /* Main Run Loop */
 321                 Conn_Handler( );
 322
 323                 Conn_Exit( );
 324                 Client_Exit( );
 325                 Channel_Exit( );
 326                 Log_Exit( );
 327         }
 328         Pidfile_Delete( );
 329
 330         return 0;
 331 } /* main */
 332
 333
 334 /**
 335  * Generate ngIRCd "version strings".
 336  *
 337  * The ngIRCd version information is generated once and then stored in the
 338  * NGIRCd_Version and NGIRCd_VersionAddition string variables for further
 339  * usage, for example by the IRC command "VERSION" and the --version command
 340  * line switch.
 341  */
 342 static void
 343 Fill_Version( void )
 344 {
 345         NGIRCd_VersionAddition[0] = '\0';
 346
 347 #ifdef SYSLOG
 348         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 349 #endif
 350 #ifdef ZLIB
 351         if( NGIRCd_VersionAddition[0] )
 352                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 353         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 354 #endif
 355 #ifdef SSL_SUPPORT
 356         if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 357         strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
 358 #endif
 359 #ifdef TCPWRAP
 360         if( NGIRCd_VersionAddition[0] )
 361                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 362         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 363 #endif
 364 #ifdef IDENTAUTH
 365         if( NGIRCd_VersionAddition[0] )
 366                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 367         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 368 #endif
 369 #ifdef PAM
 370         if (NGIRCd_VersionAddition[0])
 371                 strlcat(NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition);
 372         strlcat(NGIRCd_VersionAddition, "PAM", sizeof NGIRCd_VersionAddition);
 373 #endif
 374 #ifdef DEBUG
 375         if( NGIRCd_VersionAddition[0] )
 376                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 377         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 378 #endif
 379 #ifdef SNIFFER
 380         if( NGIRCd_VersionAddition[0] )
 381                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 382         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 383 #endif
 384 #ifdef STRICT_RFC
 385         if( NGIRCd_VersionAddition[0] )
 386                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 387         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 388 #endif
 389 #ifdef IRCPLUS
 390         if( NGIRCd_VersionAddition[0] )
 391                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 392         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 393 #endif
 394 #ifdef WANT_IPV6
 395         if (NGIRCd_VersionAddition[0])
 396                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 397         strlcat(NGIRCd_VersionAddition, "IPv6", sizeof(NGIRCd_VersionAddition));
 398 #endif
 399         if( NGIRCd_VersionAddition[0] )
 400                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 401
 402         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 403         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 404         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 405         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 406         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 407
 408         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 409                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 410 } /* Fill_Version */
 411
 412
 413 /**
 414  * Display copyright and version information of ngIRCd on the console.
 415  */
 416 static void
 417 Show_Version( void )
 418 {
 419         puts( NGIRCd_Version );
 420         puts( "Copyright (c)2001-2011 Alexander Barton (<alex@barton.de>) and Contributors." );
 421         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 422         puts( "This is free software; see the source for copying conditions. There is NO" );
 423         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 424 } /* Show_Version */
 425
 426
 427 /**
 428  * Display a short help text on the console.
 429  * This help depends on the configuration of the executable and only shows
 430  * options that are actually enabled.
 431  */
 432 static void
 433 Show_Help( void )
 434 {
 435 #ifdef DEBUG
 436         puts( "  -d, --debug        log extra debug messages" );
 437 #endif
 438         puts( "  -f, --config <f>   use file <f> as configuration file" );
 439         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 440         puts( "  -p, --passive      disable automatic connections to other servers" );
 441 #ifdef SNIFFER
 442         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 443 #endif
 444         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 445         puts( "  -V, --version      output version information and exit" );
 446         puts( "  -h, --help         display this help and exit" );
 447 } /* Show_Help */
 448
 449
 450 /**
 451  * Delete the file containing the process ID (PID).
 452  */
 453 static void
 454 Pidfile_Delete( void )
 455 {
 456         /* Pidfile configured? */
 457         if( ! Conf_PidFile[0] ) return;
 458
 459 #ifdef DEBUG
 460         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 461 #endif
 462
 463         if( unlink( Conf_PidFile ))
 464                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 465 } /* Pidfile_Delete */
 466
 467
 468 /**
 469  * Create the file containing the process ID of ngIRCd ("PID file").
 470  *
 471  * @param pid   The process ID to be stored in this file.
 472  */
 473 static void
 474 Pidfile_Create(pid_t pid)
 475 {
 476         int pidfd;
 477         char pidbuf[64];
 478         int len;
 479
 480         /* Pidfile configured? */
 481         if( ! Conf_PidFile[0] ) return;
 482
 483 #ifdef DEBUG
 484         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 485 #endif
 486
 487         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 488         if ( pidfd < 0 ) {
 489                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 490                 return;
 491         }
 492
 493         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 494         if (len < 0 || len >= (int)sizeof pidbuf) {
 495                 Log( LOG_ERR, "Error converting pid");
 496                 return;
 497         }
 498
 499         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 500                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 501
 502         if( close(pidfd) != 0 )
 503                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 504 } /* Pidfile_Create */
 505
 506
 507 /**
 508  * Redirect stdin, stdout and stderr to apropriate file handles.
 509  *
 510  * @param fd    The file handle stdin, stdout and stderr should be redirected to.
 511  */
 512 static void
 513 Setup_FDStreams(int fd)
 514 {
 515         if (fd < 0)
 516                 return;
 517
 518         fflush(stdout);
 519         fflush(stderr);
 520
 521         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 522         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 523 } /* Setup_FDStreams */
 524
 525
 526 /**
 527  * Get user and group ID of unprivileged "nobody" user.
 528  *
 529  * @param uid   User ID
 530  * @param gid   Group ID
 531  * @return      true on success.
 532  */
 533 static bool
 534 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 535 {
 536         struct passwd *pwd;
 537
 538 #ifdef __CYGWIN__
 539         /* Cygwin kludge.
 540          * It can return EINVAL instead of EPERM
 541          * so, if we are already unprivileged,
 542          * use id of current user.
 543          */
 544         if (geteuid() && getuid()) {
 545                 *uid = getuid();
 546                 *gid = getgid();
 547                 return true;
 548         }
 549 #endif
 550
 551         pwd = getpwnam("nobody");
 552         if (!pwd) return false;
 553
 554         if ( !pwd->pw_uid || !pwd->pw_gid)
 555                 return false;
 556
 557         *uid = pwd->pw_uid;
 558         *gid = pwd->pw_gid;
 559         endpwent();
 560
 561         return true;
 562 } /* NGIRCd_getNobodyID */
 563
 564
 565 /**
 566  * Initialize ngIRCd daemon.
 567  *
 568  * @param NGIRCd_NoDaemon       Set to true if ngIRCd should run in the
 569  *                              foreground and not as a daemon.
 570  * @return                      true on success.
 571  */
 572 static bool
 573 NGIRCd_Init( bool NGIRCd_NoDaemon )
 574 {
 575         static bool initialized;
 576         bool chrooted = false;
 577         struct passwd *pwd;
 578         struct group *grp;
 579         int real_errno, fd = -1;
 580         pid_t pid;
 581
 582         if (initialized)
 583                 return true;
 584
 585         if (!NGIRCd_NoDaemon) {
 586                 /* open /dev/null before chroot() */
 587                 fd = open( "/dev/null", O_RDWR);
 588                 if (fd < 0)
 589                         Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 590         }
 591
 592         if (!ConnSSL_InitLibrary())
 593                 Log(LOG_WARNING,
 594                     "Warning: Error during SSL initialization, continuing ...");
 595
 596         if( Conf_Chroot[0] ) {
 597                 if( chdir( Conf_Chroot ) != 0 ) {
 598                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 599                         goto out;
 600                 }
 601
 602                 if( chroot( Conf_Chroot ) != 0 ) {
 603                         if (errno != EPERM) {
 604                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 605                                                                 Conf_Chroot, strerror( errno ));
 606                                 goto out;
 607                         }
 608                 } else {
 609                         chrooted = true;
 610                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 611                 }
 612         }
 613
 614         if (Conf_UID == 0) {
 615                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 616
 617                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 618                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 619                                         errno ? strerror(errno) : "not found" );
 620                         goto out;
 621                 }
 622         }
 623
 624         if (getgid() != Conf_GID) {
 625                 /* Change group ID */
 626                 if (setgid(Conf_GID) != 0) {
 627                         real_errno = errno;
 628                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 629                         if (real_errno != EPERM)
 630                                 goto out;
 631                 }
 632         }
 633
 634         if (getuid() != Conf_UID) {
 635                 /* Change user ID */
 636                 if (setuid(Conf_UID) != 0) {
 637                         real_errno = errno;
 638                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 639                         if (real_errno != EPERM)
 640                                 goto out;
 641                 }
 642         }
 643
 644         initialized = true;
 645
 646         /* Normally a child process is forked which isn't any longer
 647          * connected to ther controlling terminal. Use "--nodaemon"
 648          * to disable this "daemon mode" (useful for debugging). */
 649         if ( ! NGIRCd_NoDaemon ) {
 650                 pid = fork( );
 651                 if( pid > 0 ) {
 652                         /* "Old" process: exit. */
 653                         exit( 0 );
 654                 }
 655                 if( pid < 0 ) {
 656                         /* Error!? */
 657                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 658                                                                 PACKAGE_NAME, strerror( errno ));
 659                         exit( 1 );
 660                 }
 661
 662                 /* New child process */
 663 #ifndef NeXT
 664                 (void)setsid( );
 665 #else
 666                 setpgrp(0, getpid());
 667 #endif
 668                 if (chdir( "/" ) != 0)
 669                         Log(LOG_ERR, "Can't change directory to '/': %s",
 670                                      strerror(errno));
 671
 672                 /* Detach stdin, stdout and stderr */
 673                 Setup_FDStreams(fd);
 674                 if (fd > 2) {
 675                         close(fd);
 676                         fd = -1;
 677                 }
 678         }
 679         pid = getpid();
 680
 681         Pidfile_Create( pid );
 682
 683         /* Check UID/GID we are running as, can be different from values
 684          * configured (e. g. if we were already started with a UID>0. */
 685         Conf_UID = getuid();
 686         Conf_GID = getgid();
 687
 688         pwd = getpwuid( Conf_UID );
 689         grp = getgrgid( Conf_GID );
 690
 691         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 692                                 pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 693                                 grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 694
 695         if (chrooted) {
 696                 Log(LOG_INFO, "Running with root directory \"%s\".",
 697                     Conf_Chroot );
 698                 return true;
 699         } else
 700                 Log(LOG_INFO, "Not running with changed root directory.");
 701
 702         /* Change working directory to home directory of the user
 703          * we are running as (only when running in daemon mode and not in chroot) */
 704
 705         if (pwd) {
 706                 if (!NGIRCd_NoDaemon ) {
 707                         if( chdir( pwd->pw_dir ) == 0 )
 708                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 709                         else
 710                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
 711                                                                 pwd->pw_dir, strerror( errno ));
 712                 }
 713         } else {
 714                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 715         }
 716
 717         return true;
 718  out:
 719         if (fd > 2)
 720                 close(fd);
 721         return false;
 722 } /* NGIRCd_Init */
 723
 724
 725 /* -eof- */