src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2010 Alexander Barton (alex@barton.de).
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12
  13 #include "portab.h"
  14
  15 /**
  16  * @file
  17  * The main program, including the C function main() which is called
  18  * by the loader of the operating system.
  19  */
  20
  21 #include "imp.h"
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <signal.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <time.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33 #include <pwd.h>
  34 #include <grp.h>
  35
  36 #if defined(DEBUG) && defined(HAVE_MTRACE)
  37 #include <mcheck.h>
  38 #endif
  39
  40 #include "defines.h"
  41 #include "conn.h"
  42 #include "conf-ssl.h"
  43 #include "channel.h"
  44 #include "conf.h"
  45 #include "lists.h"
  46 #include "log.h"
  47 #include "parse.h"
  48 #include "sighandlers.h"
  49 #include "io.h"
  50 #include "irc.h"
  51
  52 #ifdef ZEROCONF
  53 #include "rendezvous.h"
  54 #endif
  55
  56 #include "exp.h"
  57 #include "ngircd.h"
  58
  59
  60 static void Show_Version PARAMS(( void ));
  61 static void Show_Help PARAMS(( void ));
  62
  63 static void Pidfile_Create PARAMS(( pid_t pid ));
  64 static void Pidfile_Delete PARAMS(( void ));
  65
  66 static void Fill_Version PARAMS(( void ));
  67
  68 static void Setup_FDStreams PARAMS(( int fd ));
  69
  70 static bool NGIRCd_Init PARAMS(( bool ));
  71
  72
  73 /**
  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 #ifdef DEBUG
 289                 /* Redirect stderr handle to "error file" for debugging
 290                  * when not running in "no daemon" mode: */
 291                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 292 #endif
 293                 if (!io_library_init(CONNECTION_POOL)) {
 294                         Log(LOG_ALERT, "Fatal: Cannot initialize IO routines: %s", strerror(errno));
 295                         exit(1);
 296                 }
 297
 298                 if (!Signals_Init()) {
 299                         Log(LOG_ALERT, "Fatal: Could not set up signal handlers: %s", strerror(errno));
 300                         exit(1);
 301                 }
 302
 303                 /*
 304                  * create protocol and server identification.
 305                  * The syntax used by ngIRCd in PASS commands and the extended flags
 306                  * are described in doc/Protocol.txt
 307                  */
 308 #ifdef IRCPLUS
 309                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 310 #ifdef ZLIB
 311                 strcat( NGIRCd_ProtoID, "Z" );
 312 #endif
 313                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 314 #else
 315                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 316 #endif
 317                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 318 #ifdef ZLIB
 319                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 320 #endif
 321                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 322
 323                 Channel_InitPredefined( );
 324
 325                 if( Conn_InitListeners( ) < 1 )
 326                 {
 327                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 328                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 329                         Pidfile_Delete( );
 330                         exit( 1 );
 331                 }
 332
 333                 /* Hauptschleife */
 334                 Conn_Handler( );
 335
 336                 /* Alles abmelden */
 337                 Conn_Exit( );
 338 #ifdef ZEROCONF
 339                 Rendezvous_Exit( );
 340 #endif
 341                 Client_Exit( );
 342                 Channel_Exit( );
 343                 Log_Exit( );
 344         }
 345         Pidfile_Delete( );
 346
 347         return 0;
 348 } /* main */
 349
 350
 351 /**
 352  * Generate ngIRCd "version string".
 353  * This string is generated once and then stored in NGIRCd_Version for
 354  * further usage, for example by the IRC command VERSION and the --version
 355  * command line switch.
 356  */
 357 static void
 358 Fill_Version( void )
 359 {
 360         NGIRCd_VersionAddition[0] = '\0';
 361
 362 #ifdef SYSLOG
 363         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 364 #endif
 365 #ifdef ZLIB
 366         if( NGIRCd_VersionAddition[0] )
 367                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 368         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 369 #endif
 370 #ifdef SSL_SUPPORT
 371         if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 372         strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
 373 #endif
 374 #ifdef TCPWRAP
 375         if( NGIRCd_VersionAddition[0] )
 376                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 377         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 378 #endif
 379 #ifdef ZEROCONF
 380         if( NGIRCd_VersionAddition[0] )
 381                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 382         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 383 #endif
 384 #ifdef IDENTAUTH
 385         if( NGIRCd_VersionAddition[0] )
 386                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 387         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 388 #endif
 389 #ifdef PAM
 390         if (NGIRCd_VersionAddition[0])
 391                 strlcat(NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition);
 392         strlcat(NGIRCd_VersionAddition, "PAM", sizeof NGIRCd_VersionAddition);
 393 #endif
 394 #ifdef DEBUG
 395         if( NGIRCd_VersionAddition[0] )
 396                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 397         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 398 #endif
 399 #ifdef SNIFFER
 400         if( NGIRCd_VersionAddition[0] )
 401                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 402         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 403 #endif
 404 #ifdef STRICT_RFC
 405         if( NGIRCd_VersionAddition[0] )
 406                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 407         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 408 #endif
 409 #ifdef IRCPLUS
 410         if( NGIRCd_VersionAddition[0] )
 411                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 412         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 413 #endif
 414 #ifdef WANT_IPV6
 415         if (NGIRCd_VersionAddition[0])
 416                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 417         strlcat(NGIRCd_VersionAddition, "IPv6", sizeof(NGIRCd_VersionAddition));
 418 #endif
 419         if( NGIRCd_VersionAddition[0] )
 420                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 421
 422         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 423         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 424         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 425         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 426         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 427
 428         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 429                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 430         } /* Fill_Version */
 431
 432
 433 /**
 434  * Display copyright and version information of ngIRCd on the console.
 435  */
 436 static void
 437 Show_Version( void )
 438 {
 439         puts( NGIRCd_Version );
 440         puts( "Copyright (c)2001-2010 Alexander Barton (<alex@barton.de>) and Contributors." );
 441         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 442         puts( "This is free software; see the source for copying conditions. There is NO" );
 443         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 444 } /* Show_Version */
 445
 446
 447 /**
 448  * Display a short help text on the console.
 449  * This help depends on the configuration of the executable and only shows
 450  * options that are actually enabled.
 451  */
 452 static void
 453 Show_Help( void )
 454 {
 455 #ifdef DEBUG
 456         puts( "  -d, --debug        log extra debug messages" );
 457 #endif
 458         puts( "  -f, --config <f>   use file <f> as configuration file" );
 459         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 460         puts( "  -p, --passive      disable automatic connections to other servers" );
 461 #ifdef SNIFFER
 462         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 463 #endif
 464         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 465         puts( "  -V, --version      output version information and exit" );
 466         puts( "  -h, --help         display this help and exit" );
 467 } /* Show_Help */
 468
 469
 470 /**
 471  * Delete the file containing the process ID (PID).
 472  */
 473 static void
 474 Pidfile_Delete( void )
 475 {
 476         /* Pidfile configured? */
 477         if( ! Conf_PidFile[0] ) return;
 478
 479 #ifdef DEBUG
 480         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 481 #endif
 482
 483         if( unlink( Conf_PidFile ))
 484                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 485 } /* Pidfile_Delete */
 486
 487
 488 /**
 489  * Create the file containing the process ID of ngIRCd ("PID file").
 490  * @param pid The process ID to be stored in this file.
 491  */
 492 static void
 493 Pidfile_Create(pid_t pid)
 494 {
 495         int pidfd;
 496         char pidbuf[64];
 497         int len;
 498
 499         /* Pidfile configured? */
 500         if( ! Conf_PidFile[0] ) return;
 501
 502 #ifdef DEBUG
 503         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 504 #endif
 505
 506         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 507         if ( pidfd < 0 ) {
 508                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 509                 return;
 510         }
 511
 512         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 513         if (len < 0 || len >= (int)sizeof pidbuf) {
 514                 Log( LOG_ERR, "Error converting pid");
 515                 return;
 516         }
 517
 518         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 519                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 520
 521         if( close(pidfd) != 0 )
 522                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 523 } /* Pidfile_Create */
 524
 525
 526 /**
 527  * Redirect stdin, stdout and stderr to apropriate file handles.
 528  */
 529 static void
 530 Setup_FDStreams(int fd)
 531 {
 532         if (fd < 0)
 533                 return;
 534
 535         fflush(stdout);
 536         fflush(stderr);
 537
 538         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 539         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 540 } /* Setup_FDStreams */
 541
 542
 543 static bool
 544 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 545 {
 546         struct passwd *pwd;
 547
 548 #ifdef __CYGWIN__
 549         /* Cygwin kludge.
 550          * It can return EINVAL instead of EPERM
 551          * so, if we are already unprivileged,
 552          * use id of current user.
 553          */
 554         if (geteuid() && getuid()) {
 555                 *uid = getuid();
 556                 *gid = getgid();
 557                 return true;
 558         }
 559 #endif
 560
 561         pwd = getpwnam("nobody");
 562         if (!pwd) return false;
 563
 564         if ( !pwd->pw_uid || !pwd->pw_gid)
 565                 return false;
 566
 567         *uid = pwd->pw_uid;
 568         *gid = pwd->pw_gid;
 569         endpwent();
 570
 571         return true;
 572 }
 573
 574
 575 static bool
 576 NGIRCd_Init( bool NGIRCd_NoDaemon )
 577 {
 578         static bool initialized;
 579         bool chrooted = false;
 580         struct passwd *pwd;
 581         struct group *grp;
 582         int real_errno, fd = -1;
 583         pid_t pid;
 584
 585         if (initialized)
 586                 return true;
 587
 588         if (!NGIRCd_NoDaemon) {
 589                 /* open /dev/null before chroot() */
 590                 fd = open( "/dev/null", O_RDWR);
 591                 if (fd < 0)
 592                         Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 593         }
 594
 595         if (!ConnSSL_InitLibrary())
 596                 Log(LOG_WARNING,
 597                     "Warning: Error during SSL initialization, continuing ...");
 598
 599         if( Conf_Chroot[0] ) {
 600                 if( chdir( Conf_Chroot ) != 0 ) {
 601                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 602                         goto out;
 603                 }
 604
 605                 if( chroot( Conf_Chroot ) != 0 ) {
 606                         if (errno != EPERM) {
 607                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 608                                                                 Conf_Chroot, strerror( errno ));
 609                                 goto out;
 610                         }
 611                 } else {
 612                         chrooted = true;
 613                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 614                 }
 615         }
 616
 617         if (Conf_UID == 0) {
 618                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 619
 620                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 621                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 622                                         errno ? strerror(errno) : "not found" );
 623                         goto out;
 624                 }
 625         }
 626
 627         if (getgid() != Conf_GID) {
 628                 /* Change group ID */
 629                 if (setgid(Conf_GID) != 0) {
 630                         real_errno = errno;
 631                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 632                         if (real_errno != EPERM)
 633                                 goto out;
 634                 }
 635         }
 636
 637         if (getuid() != Conf_UID) {
 638                 /* Change user ID */
 639                 if (setuid(Conf_UID) != 0) {
 640                         real_errno = errno;
 641                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 642                         if (real_errno != EPERM)
 643                                 goto out;
 644                 }
 645         }
 646
 647         initialized = true;
 648
 649         /* Normally a child process is forked which isn't any longer
 650          * connected to ther controlling terminal. Use "--nodaemon"
 651          * to disable this "daemon mode" (useful for debugging). */
 652         if ( ! NGIRCd_NoDaemon ) {
 653                 pid = fork( );
 654                 if( pid > 0 ) {
 655                         /* "Old" process: exit. */
 656                         exit( 0 );
 657                 }
 658                 if( pid < 0 ) {
 659                         /* Error!? */
 660                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 661                                                                 PACKAGE_NAME, strerror( errno ));
 662                         exit( 1 );
 663                 }
 664
 665                 /* New child process */
 666 #ifndef NeXT
 667                 (void)setsid( );
 668 #else
 669                 setpgrp(0, getpid());
 670 #endif
 671                 if (chdir( "/" ) != 0)
 672                         Log(LOG_ERR, "Can't change directory to '/': %s",
 673                                      strerror(errno));
 674
 675                 /* Detach stdin, stdout and stderr */
 676                 Setup_FDStreams(fd);
 677                 if (fd > 2) {
 678                         close(fd);
 679                         fd = -1;
 680                 }
 681         }
 682         pid = getpid();
 683
 684         Pidfile_Create( pid );
 685
 686         /* Check UID/GID we are running as, can be different from values
 687          * configured (e. g. if we were already started with a UID>0. */
 688         Conf_UID = getuid();
 689         Conf_GID = getgid();
 690
 691         pwd = getpwuid( Conf_UID );
 692         grp = getgrgid( Conf_GID );
 693
 694         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 695                                 pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 696                                 grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 697
 698         if (chrooted) {
 699                 Log(LOG_INFO, "Running with root directory \"%s\".",
 700                     Conf_Chroot );
 701                 return true;
 702         } else
 703                 Log(LOG_INFO, "Not running with changed root directory.");
 704
 705         /* Change working directory to home directory of the user
 706          * we are running as (only when running in daemon mode and not in chroot) */
 707
 708         if (pwd) {
 709                 if (!NGIRCd_NoDaemon ) {
 710                         if( chdir( pwd->pw_dir ) == 0 )
 711                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 712                         else
 713                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
 714                                                                 pwd->pw_dir, strerror( errno ));
 715                 }
 716         } else {
 717                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 718         }
 719
 720         return true;
 721  out:
 722         if (fd > 2)
 723                 close(fd);
 724         return false;
 725 }
 726
 727
 728 /* -eof- */