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