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 #include "exp.h"
  53 #include "ngircd.h"
  54
  55
  56 static void Show_Version PARAMS(( void ));
  57 static void Show_Help PARAMS(( void ));
  58
  59 static void Pidfile_Create PARAMS(( pid_t pid ));
  60 static void Pidfile_Delete PARAMS(( void ));
  61
  62 static void Fill_Version PARAMS(( void ));
  63
  64 static void Setup_FDStreams PARAMS(( int fd ));
  65
  66 static bool NGIRCd_Init PARAMS(( bool ));
  67
  68
  69 /**
  70  * The main() function of ngIRCd.
  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  * @param argc The number of arguments passed to ngIRCd on the command line.
  74  * @param argv An array containing all the arguments passed to ngIRCd.
  75  * @return Global exit code of ngIRCd, zero on success.
  76  */
  77 GLOBAL int
  78 main( int argc, const char *argv[] )
  79 {
  80         bool ok, configtest = false;
  81         bool NGIRCd_NoDaemon = false;
  82         int i;
  83         size_t n;
  84
  85 #if defined(DEBUG) && defined(HAVE_MTRACE)
  86         /* enable GNU libc memory tracing when running in debug mode
  87          * and functionality available */
  88         mtrace();
  89 #endif
  90
  91         umask( 0077 );
  92
  93         NGIRCd_SignalQuit = NGIRCd_SignalRestart = false;
  94         NGIRCd_Passive = false;
  95 #ifdef DEBUG
  96         NGIRCd_Debug = false;
  97 #endif
  98 #ifdef SNIFFER
  99         NGIRCd_Sniffer = false;
 100 #endif
 101         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 102         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 103
 104         Fill_Version( );
 105
 106         /* parse conmmand line */
 107         for( i = 1; i < argc; i++ )
 108         {
 109                 ok = false;
 110                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 111                 {
 112                         /* long option */
 113                         if( strcmp( argv[i], "--config" ) == 0 )
 114                         {
 115                                 if( i + 1 < argc )
 116                                 {
 117                                         /* Ok, there's an parameter left */
 118                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 119
 120                                         /* next parameter */
 121                                         i++; ok = true;
 122                                 }
 123                         }
 124                         if( strcmp( argv[i], "--configtest" ) == 0 )
 125                         {
 126                                 configtest = true;
 127                                 ok = true;
 128                         }
 129 #ifdef DEBUG
 130                         if( strcmp( argv[i], "--debug" ) == 0 )
 131                         {
 132                                 NGIRCd_Debug = true;
 133                                 ok = true;
 134                         }
 135 #endif
 136                         if( strcmp( argv[i], "--help" ) == 0 )
 137                         {
 138                                 Show_Version( );
 139                                 puts( "" ); Show_Help( ); puts( "" );
 140                                 exit( 1 );
 141                         }
 142                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 143                         {
 144                                 NGIRCd_NoDaemon = true;
 145                                 ok = true;
 146                         }
 147                         if( strcmp( argv[i], "--passive" ) == 0 )
 148                         {
 149                                 NGIRCd_Passive = true;
 150                                 ok = true;
 151                         }
 152 #ifdef SNIFFER
 153                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 154                         {
 155                                 NGIRCd_Sniffer = true;
 156                                 ok = true;
 157                         }
 158 #endif
 159                         if( strcmp( argv[i], "--version" ) == 0 )
 160                         {
 161                                 Show_Version( );
 162                                 exit( 1 );
 163                         }
 164                 }
 165                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 166                 {
 167                         /* short option */
 168                         for( n = 1; n < strlen( argv[i] ); n++ )
 169                         {
 170                                 ok = false;
 171 #ifdef DEBUG
 172                                 if (argv[i][n] == 'd') {
 173                                         NGIRCd_Debug = true;
 174                                         ok = true;
 175                                 }
 176 #endif
 177                                 if (argv[i][n] == 'f') {
 178                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 179                                         {
 180                                                 /* Ok, next character is a blank */
 181                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 182
 183                                                 /* go to the following parameter */
 184                                                 i++;
 185                                                 n = strlen( argv[i] );
 186                                                 ok = true;
 187                                         }
 188                                 }
 189
 190                                 if (argv[i][n] == 'h') {
 191                                         Show_Version();
 192                                         puts(""); Show_Help(); puts("");
 193                                         exit(1);
 194                                 }
 195
 196                                 if (argv[i][n] == 'n') {
 197                                         NGIRCd_NoDaemon = true;
 198                                         ok = true;
 199                                 }
 200                                 if (argv[i][n] == 'p') {
 201                                         NGIRCd_Passive = true;
 202                                         ok = true;
 203                                 }
 204 #ifdef SNIFFER
 205                                 if (argv[i][n] == 's') {
 206                                         NGIRCd_Sniffer = true;
 207                                         ok = true;
 208                                 }
 209 #endif
 210                                 if (argv[i][n] == 't') {
 211                                         configtest = true;
 212                                         ok = true;
 213                                 }
 214
 215                                 if (argv[i][n] == 'V') {
 216                                         Show_Version();
 217                                         exit(1);
 218                                 }
 219
 220                                 if (! ok) {
 221                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 222                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 223                                         exit( 1 );
 224                                 }
 225                         }
 226
 227                 }
 228                 if( ! ok )
 229                 {
 230                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 231                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 232                         exit( 1 );
 233                 }
 234         }
 235
 236         /* Debug-Level (for IRCs "VERSION" command) */
 237         NGIRCd_DebugLevel[0] = '\0';
 238 #ifdef DEBUG
 239         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 240 #endif
 241 #ifdef SNIFFER
 242         if( NGIRCd_Sniffer )
 243         {
 244                 NGIRCd_Debug = true;
 245                 strcpy( NGIRCd_DebugLevel, "2" );
 246         }
 247 #endif
 248
 249         if( configtest )
 250         {
 251                 Show_Version( ); puts( "" );
 252                 exit( Conf_Test( ));
 253         }
 254
 255         while( ! NGIRCd_SignalQuit )
 256         {
 257                 /* Initialize global variables */
 258                 NGIRCd_Start = time( NULL );
 259                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 260
 261                 NGIRCd_SignalRestart = false;
 262                 NGIRCd_SignalQuit = false;
 263
 264                 /* Initialize modules, part I */
 265                 Log_Init( ! NGIRCd_NoDaemon );
 266                 Conf_Init( );
 267
 268                 /* Initialize the "main program": chroot environment, user and
 269                  * group ID, ... */
 270                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 271                         Log(LOG_ALERT, "Fatal: Initialization failed");
 272                         exit(1);
 273                 }
 274
 275                 /* Initialize modules, part II: these functions are eventually
 276                  * called with already dropped privileges ... */
 277                 Channel_Init( );
 278                 Client_Init( );
 279                 Conn_Init( );
 280
 281                 if (!io_library_init(CONNECTION_POOL)) {
 282                         Log(LOG_ALERT, "Fatal: Cannot initialize IO routines: %s", strerror(errno));
 283                         exit(1);
 284                 }
 285
 286                 if (!Signals_Init()) {
 287                         Log(LOG_ALERT, "Fatal: Could not set up signal handlers: %s", strerror(errno));
 288                         exit(1);
 289                 }
 290
 291                 /*
 292                  * create protocol and server identification.
 293                  * The syntax used by ngIRCd in PASS commands and the extended flags
 294                  * are described in doc/Protocol.txt
 295                  */
 296 #ifdef IRCPLUS
 297                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 298 #ifdef ZLIB
 299                 strcat( NGIRCd_ProtoID, "Z" );
 300 #endif
 301                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 302 #else
 303                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 304 #endif
 305                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 306 #ifdef ZLIB
 307                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 308 #endif
 309                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 310
 311                 Channel_InitPredefined( );
 312
 313                 if( Conn_InitListeners( ) < 1 )
 314                 {
 315                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 316                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 317                         Pidfile_Delete( );
 318                         exit( 1 );
 319                 }
 320
 321                 /* Hauptschleife */
 322                 Conn_Handler( );
 323
 324                 /* Alles abmelden */
 325                 Conn_Exit( );
 326                 Client_Exit( );
 327                 Channel_Exit( );
 328                 Log_Exit( );
 329         }
 330         Pidfile_Delete( );
 331
 332         return 0;
 333 } /* main */
 334
 335
 336 /**
 337  * Generate ngIRCd "version string".
 338  * This string is generated once and then stored in NGIRCd_Version for
 339  * further usage, for example by the IRC command VERSION and the --version
 340  * command 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  * @param pid The process ID to be stored in this file.
 471  */
 472 static void
 473 Pidfile_Create(pid_t pid)
 474 {
 475         int pidfd;
 476         char pidbuf[64];
 477         int len;
 478
 479         /* Pidfile configured? */
 480         if( ! Conf_PidFile[0] ) return;
 481
 482 #ifdef DEBUG
 483         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 484 #endif
 485
 486         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 487         if ( pidfd < 0 ) {
 488                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 489                 return;
 490         }
 491
 492         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 493         if (len < 0 || len >= (int)sizeof pidbuf) {
 494                 Log( LOG_ERR, "Error converting pid");
 495                 return;
 496         }
 497
 498         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 499                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 500
 501         if( close(pidfd) != 0 )
 502                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 503 } /* Pidfile_Create */
 504
 505
 506 /**
 507  * Redirect stdin, stdout and stderr to apropriate file handles.
 508  */
 509 static void
 510 Setup_FDStreams(int fd)
 511 {
 512         if (fd < 0)
 513                 return;
 514
 515         fflush(stdout);
 516         fflush(stderr);
 517
 518         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 519         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 520 } /* Setup_FDStreams */
 521
 522
 523 static bool
 524 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 525 {
 526         struct passwd *pwd;
 527
 528 #ifdef __CYGWIN__
 529         /* Cygwin kludge.
 530          * It can return EINVAL instead of EPERM
 531          * so, if we are already unprivileged,
 532          * use id of current user.
 533          */
 534         if (geteuid() && getuid()) {
 535                 *uid = getuid();
 536                 *gid = getgid();
 537                 return true;
 538         }
 539 #endif
 540
 541         pwd = getpwnam("nobody");
 542         if (!pwd) return false;
 543
 544         if ( !pwd->pw_uid || !pwd->pw_gid)
 545                 return false;
 546
 547         *uid = pwd->pw_uid;
 548         *gid = pwd->pw_gid;
 549         endpwent();
 550
 551         return true;
 552 }
 553
 554
 555 static bool
 556 NGIRCd_Init( bool NGIRCd_NoDaemon )
 557 {
 558         static bool initialized;
 559         bool chrooted = false;
 560         struct passwd *pwd;
 561         struct group *grp;
 562         int real_errno, fd = -1;
 563         pid_t pid;
 564
 565         if (initialized)
 566                 return true;
 567
 568         if (!NGIRCd_NoDaemon) {
 569                 /* open /dev/null before chroot() */
 570                 fd = open( "/dev/null", O_RDWR);
 571                 if (fd < 0)
 572                         Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 573         }
 574
 575         if (!ConnSSL_InitLibrary())
 576                 Log(LOG_WARNING,
 577                     "Warning: Error during SSL initialization, continuing ...");
 578
 579         if( Conf_Chroot[0] ) {
 580                 if( chdir( Conf_Chroot ) != 0 ) {
 581                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 582                         goto out;
 583                 }
 584
 585                 if( chroot( Conf_Chroot ) != 0 ) {
 586                         if (errno != EPERM) {
 587                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 588                                                                 Conf_Chroot, strerror( errno ));
 589                                 goto out;
 590                         }
 591                 } else {
 592                         chrooted = true;
 593                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 594                 }
 595         }
 596
 597         if (Conf_UID == 0) {
 598                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 599
 600                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 601                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 602                                         errno ? strerror(errno) : "not found" );
 603                         goto out;
 604                 }
 605         }
 606
 607         if (getgid() != Conf_GID) {
 608                 /* Change group ID */
 609                 if (setgid(Conf_GID) != 0) {
 610                         real_errno = errno;
 611                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 612                         if (real_errno != EPERM)
 613                                 goto out;
 614                 }
 615         }
 616
 617         if (getuid() != Conf_UID) {
 618                 /* Change user ID */
 619                 if (setuid(Conf_UID) != 0) {
 620                         real_errno = errno;
 621                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 622                         if (real_errno != EPERM)
 623                                 goto out;
 624                 }
 625         }
 626
 627         initialized = true;
 628
 629         /* Normally a child process is forked which isn't any longer
 630          * connected to ther controlling terminal. Use "--nodaemon"
 631          * to disable this "daemon mode" (useful for debugging). */
 632         if ( ! NGIRCd_NoDaemon ) {
 633                 pid = fork( );
 634                 if( pid > 0 ) {
 635                         /* "Old" process: exit. */
 636                         exit( 0 );
 637                 }
 638                 if( pid < 0 ) {
 639                         /* Error!? */
 640                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 641                                                                 PACKAGE_NAME, strerror( errno ));
 642                         exit( 1 );
 643                 }
 644
 645                 /* New child process */
 646 #ifndef NeXT
 647                 (void)setsid( );
 648 #else
 649                 setpgrp(0, getpid());
 650 #endif
 651                 if (chdir( "/" ) != 0)
 652                         Log(LOG_ERR, "Can't change directory to '/': %s",
 653                                      strerror(errno));
 654
 655                 /* Detach stdin, stdout and stderr */
 656                 Setup_FDStreams(fd);
 657                 if (fd > 2) {
 658                         close(fd);
 659                         fd = -1;
 660                 }
 661         }
 662         pid = getpid();
 663
 664         Pidfile_Create( pid );
 665
 666         /* Check UID/GID we are running as, can be different from values
 667          * configured (e. g. if we were already started with a UID>0. */
 668         Conf_UID = getuid();
 669         Conf_GID = getgid();
 670
 671         pwd = getpwuid( Conf_UID );
 672         grp = getgrgid( Conf_GID );
 673
 674         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 675                                 pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 676                                 grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 677
 678         if (chrooted) {
 679                 Log(LOG_INFO, "Running with root directory \"%s\".",
 680                     Conf_Chroot );
 681                 return true;
 682         } else
 683                 Log(LOG_INFO, "Not running with changed root directory.");
 684
 685         /* Change working directory to home directory of the user
 686          * we are running as (only when running in daemon mode and not in chroot) */
 687
 688         if (pwd) {
 689                 if (!NGIRCd_NoDaemon ) {
 690                         if( chdir( pwd->pw_dir ) == 0 )
 691                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 692                         else
 693                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
 694                                                                 pwd->pw_dir, strerror( errno ));
 695                 }
 696         } else {
 697                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 698         }
 699
 700         return true;
 701  out:
 702         if (fd > 2)
 703                 close(fd);
 704         return false;
 705 }
 706
 707
 708 /* -eof- */