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 <sys/wait.h>
  33 #include <fcntl.h>
  34 #include <pwd.h>
  35 #include <grp.h>
  36
  37 #if defined(DEBUG) && defined(HAVE_MTRACE)
  38 #include <mcheck.h>
  39 #endif
  40
  41 #include "defines.h"
  42 #include "conn.h"
  43 #include "conf-ssl.h"
  44 #include "client.h"
  45 #include "channel.h"
  46 #include "conf.h"
  47 #include "lists.h"
  48 #include "log.h"
  49 #include "parse.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 Initialize_Signal_Handler PARAMS(( void ));
  61 static void Signal_Handler PARAMS(( int Signal ));
  62
  63 static void Show_Version PARAMS(( void ));
  64 static void Show_Help PARAMS(( void ));
  65
  66 static void Pidfile_Create PARAMS(( pid_t pid ));
  67 static void Pidfile_Delete PARAMS(( void ));
  68
  69 static void Fill_Version PARAMS(( void ));
  70
  71 static void Setup_FDStreams PARAMS(( void ));
  72
  73 static bool NGIRCd_Init PARAMS(( bool ));
  74
  75 /**
  76  * The main() function of ngIRCd.
  77  * Here all starts: this function is called by the operating system loader,
  78  * it is the first portion of code executed of ngIRCd.
  79  * @param argc The number of arguments passed to ngIRCd on the command line.
  80  * @param argv An array containing all the arguments passed to ngIRCd.
  81  * @return Global exit code of ngIRCd, zero on success.
  82  */
  83 GLOBAL int
  84 main( int argc, const char *argv[] )
  85 {
  86         bool ok, configtest = false;
  87         bool NGIRCd_NoDaemon = false;
  88         int i;
  89         size_t n;
  90
  91 #if defined(DEBUG) && defined(HAVE_MTRACE)
  92         /* enable GNU libc memory tracing when running in debug mode
  93          * and functionality available */
  94         mtrace();
  95 #endif
  96
  97         umask( 0077 );
  98
  99         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = false;
 100         NGIRCd_Passive = false;
 101 #ifdef DEBUG
 102         NGIRCd_Debug = false;
 103 #endif
 104 #ifdef SNIFFER
 105         NGIRCd_Sniffer = false;
 106 #endif
 107         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 108         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 109
 110         Fill_Version( );
 111
 112         /* parse conmmand line */
 113         for( i = 1; i < argc; i++ )
 114         {
 115                 ok = false;
 116                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 117                 {
 118                         /* long option */
 119                         if( strcmp( argv[i], "--config" ) == 0 )
 120                         {
 121                                 if( i + 1 < argc )
 122                                 {
 123                                         /* Ok, there's an parameter left */
 124                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 125
 126                                         /* next parameter */
 127                                         i++; ok = true;
 128                                 }
 129                         }
 130                         if( strcmp( argv[i], "--configtest" ) == 0 )
 131                         {
 132                                 configtest = true;
 133                                 ok = true;
 134                         }
 135 #ifdef DEBUG
 136                         if( strcmp( argv[i], "--debug" ) == 0 )
 137                         {
 138                                 NGIRCd_Debug = true;
 139                                 ok = true;
 140                         }
 141 #endif
 142                         if( strcmp( argv[i], "--help" ) == 0 )
 143                         {
 144                                 Show_Version( );
 145                                 puts( "" ); Show_Help( ); puts( "" );
 146                                 exit( 1 );
 147                         }
 148                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 149                         {
 150                                 NGIRCd_NoDaemon = true;
 151                                 ok = true;
 152                         }
 153                         if( strcmp( argv[i], "--passive" ) == 0 )
 154                         {
 155                                 NGIRCd_Passive = true;
 156                                 ok = true;
 157                         }
 158 #ifdef SNIFFER
 159                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 160                         {
 161                                 NGIRCd_Sniffer = true;
 162                                 ok = true;
 163                         }
 164 #endif
 165                         if( strcmp( argv[i], "--version" ) == 0 )
 166                         {
 167                                 Show_Version( );
 168                                 exit( 1 );
 169                         }
 170                 }
 171                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 172                 {
 173                         /* short option */
 174                         for( n = 1; n < strlen( argv[i] ); n++ )
 175                         {
 176                                 ok = false;
 177 #ifdef DEBUG
 178                                 if (argv[i][n] == 'd') {
 179                                         NGIRCd_Debug = true;
 180                                         ok = true;
 181                                 }
 182 #endif
 183                                 if (argv[i][n] == 'f') {
 184                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 185                                         {
 186                                                 /* Ok, next character is a blank */
 187                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 188
 189                                                 /* go to the following parameter */
 190                                                 i++;
 191                                                 n = strlen( argv[i] );
 192                                                 ok = true;
 193                                         }
 194                                 }
 195
 196                                 if (argv[i][n] == 'h') {
 197                                         Show_Version();
 198                                         puts(""); Show_Help(); puts("");
 199                                         exit(1);
 200                                 }
 201
 202                                 if (argv[i][n] == 'n') {
 203                                         NGIRCd_NoDaemon = true;
 204                                         ok = true;
 205                                 }
 206                                 if (argv[i][n] == 'p') {
 207                                         NGIRCd_Passive = true;
 208                                         ok = true;
 209                                 }
 210 #ifdef SNIFFER
 211                                 if (argv[i][n] == 's') {
 212                                         NGIRCd_Sniffer = true;
 213                                         ok = true;
 214                                 }
 215 #endif
 216                                 if (argv[i][n] == 't') {
 217                                         configtest = true;
 218                                         ok = true;
 219                                 }
 220
 221                                 if (argv[i][n] == 'V') {
 222                                         Show_Version();
 223                                         exit(1);
 224                                 }
 225
 226                                 if (! ok) {
 227                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 228                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 229                                         exit( 1 );
 230                                 }
 231                         }
 232
 233                 }
 234                 if( ! ok )
 235                 {
 236                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 237                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 238                         exit( 1 );
 239                 }
 240         }
 241
 242         /* Debug-Level (for IRCs "VERSION" command) */
 243         NGIRCd_DebugLevel[0] = '\0';
 244 #ifdef DEBUG
 245         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 246 #endif
 247 #ifdef SNIFFER
 248         if( NGIRCd_Sniffer )
 249         {
 250                 NGIRCd_Debug = true;
 251                 strcpy( NGIRCd_DebugLevel, "2" );
 252         }
 253 #endif
 254
 255         if( configtest )
 256         {
 257                 Show_Version( ); puts( "" );
 258                 exit( Conf_Test( ));
 259         }
 260
 261         while( ! NGIRCd_SignalQuit )
 262         {
 263                 /* Initialize global variables */
 264                 NGIRCd_Start = time( NULL );
 265                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 266
 267                 NGIRCd_SignalRehash = false;
 268                 NGIRCd_SignalRestart = false;
 269                 NGIRCd_SignalQuit = false;
 270
 271                 /* Initialize modules, part I */
 272                 Log_Init( ! NGIRCd_NoDaemon );
 273                 Conf_Init( );
 274
 275                 /* Initialize the "main program": chroot environment, user and
 276                  * group ID, ... */
 277                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 278                         Log(LOG_ALERT, "Fatal: Initialization failed");
 279                         exit(1);
 280                 }
 281
 282                 /* Initialize modules, part II: these functions are eventually
 283                  * called with already dropped privileges ... */
 284                 Channel_Init( );
 285                 Client_Init( );
 286 #ifdef ZEROCONF
 287                 Rendezvous_Init( );
 288 #endif
 289                 Conn_Init( );
 290
 291 #ifdef DEBUG
 292                 /* Redirect stderr handle to "error file" for debugging
 293                  * when not running in "no daemon" mode: */
 294                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 295 #endif
 296
 297                 Initialize_Signal_Handler( );
 298
 299                 /*
 300                  * create protocol and server identification.
 301                  * The syntax used by ngIRCd in PASS commands and the extended flags
 302                  * are described in doc/Protocol.txt
 303                  */
 304 #ifdef IRCPLUS
 305                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 306 #ifdef ZLIB
 307                 strcat( NGIRCd_ProtoID, "Z" );
 308 #endif
 309                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 310 #else
 311                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 312 #endif
 313                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 314 #ifdef ZLIB
 315                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 316 #endif
 317                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 318
 319                 Channel_InitPredefined( );
 320
 321                 if( Conn_InitListeners( ) < 1 )
 322                 {
 323                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 324                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 325                         Pidfile_Delete( );
 326                         exit( 1 );
 327                 }
 328
 329                 /* Hauptschleife */
 330                 Conn_Handler( );
 331
 332                 /* Alles abmelden */
 333                 Conn_Exit( );
 334 #ifdef ZEROCONF
 335                 Rendezvous_Exit( );
 336 #endif
 337                 Client_Exit( );
 338                 Channel_Exit( );
 339                 Log_Exit( );
 340         }
 341         Pidfile_Delete( );
 342
 343         return 0;
 344 } /* main */
 345
 346
 347 /**
 348  * Generate ngIRCd "version string".
 349  * This string is generated once and then stored in NGIRCd_Version for
 350  * further usage, for example by the IRC command VERSION and the --version
 351  * command line switch.
 352  */
 353 static void
 354 Fill_Version( void )
 355 {
 356         NGIRCd_VersionAddition[0] = '\0';
 357
 358 #ifdef SYSLOG
 359         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 360 #endif
 361 #ifdef ZLIB
 362         if( NGIRCd_VersionAddition[0] )
 363                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 364
 365         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 366 #endif
 367 #ifdef SSL_SUPPORT
 368         if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 369         strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
 370 #endif
 371 #ifdef TCPWRAP
 372         if( NGIRCd_VersionAddition[0] )
 373                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 374
 375         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 376 #endif
 377 #ifdef ZEROCONF
 378         if( NGIRCd_VersionAddition[0] )
 379                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 380
 381         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 382 #endif
 383 #ifdef IDENTAUTH
 384         if( NGIRCd_VersionAddition[0] )
 385                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 386
 387         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 388 #endif
 389 #ifdef DEBUG
 390         if( NGIRCd_VersionAddition[0] )
 391                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 392
 393         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 394 #endif
 395 #ifdef SNIFFER
 396         if( NGIRCd_VersionAddition[0] )
 397                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 398
 399         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 400 #endif
 401 #ifdef STRICT_RFC
 402         if( NGIRCd_VersionAddition[0] )
 403                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 404
 405         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 406 #endif
 407 #ifdef IRCPLUS
 408         if( NGIRCd_VersionAddition[0] )
 409                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 410
 411         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 412 #endif
 413 #ifdef WANT_IPV6
 414         if (NGIRCd_VersionAddition[0])
 415                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 416
 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  * Reload the server configuration file.
 435  */
 436 GLOBAL void
 437 NGIRCd_Rehash( void )
 438 {
 439         char old_name[CLIENT_ID_LEN];
 440         unsigned old_nicklen;
 441
 442         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 443         NGIRCd_SignalRehash = false;
 444
 445         /* Remember old server name and nick name length */
 446         strlcpy( old_name, Conf_ServerName, sizeof old_name );
 447         old_nicklen = Conf_MaxNickLength;
 448
 449         /* Re-read configuration ... */
 450         if (!Conf_Rehash( ))
 451                 return;
 452
 453         /* Close down all listening sockets */
 454         Conn_ExitListeners( );
 455
 456         /* Recover old server name and nick name length: these values can't
 457          * be changed during run-time */
 458         if (strcmp(old_name, Conf_ServerName) != 0 ) {
 459                 strlcpy(Conf_ServerName, old_name, sizeof Conf_ServerName);
 460                 Log(LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name.");
 461         }
 462         if (old_nicklen != Conf_MaxNickLength) {
 463                 Conf_MaxNickLength = old_nicklen;
 464                 Log(LOG_ERR, "Can't change \"MaxNickLength\" on runtime! Ignored new value.");
 465         }
 466
 467         /* Create new pre-defined channels */
 468         Channel_InitPredefined( );
 469
 470         if (!ConnSSL_InitLibrary())
 471                 Log(LOG_WARNING, "Re-Initializing SSL failed, using old keys");
 472
 473         /* Start listening on sockets */
 474         Conn_InitListeners( );
 475
 476         /* Sync configuration with established connections */
 477         Conn_SyncServerStruct( );
 478
 479         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 480 } /* NGIRCd_Rehash */
 481
 482
 483 /**
 484  * Initialize the signal handler.
 485  */
 486 static void
 487 Initialize_Signal_Handler( void )
 488 {
 489 #ifdef HAVE_SIGACTION
 490         struct sigaction saction;
 491
 492         memset( &saction, 0, sizeof( saction ));
 493         saction.sa_handler = Signal_Handler;
 494 #ifdef SA_RESTART
 495         saction.sa_flags |= SA_RESTART;
 496 #endif
 497 #ifdef SA_NOCLDWAIT
 498         saction.sa_flags |= SA_NOCLDWAIT;
 499 #endif
 500
 501         sigaction(SIGINT, &saction, NULL);
 502         sigaction(SIGQUIT, &saction, NULL);
 503         sigaction(SIGTERM, &saction, NULL);
 504         sigaction(SIGHUP, &saction, NULL);
 505         sigaction(SIGCHLD, &saction, NULL);
 506
 507         /* we handle write errors properly; ignore SIGPIPE */
 508         saction.sa_handler = SIG_IGN;
 509         sigaction(SIGPIPE, &saction, NULL);
 510 #else
 511         signal(SIGINT, Signal_Handler);
 512         signal(SIGQUIT, Signal_Handler);
 513         signal(SIGTERM, Signal_Handler);
 514         signal(SIGHUP, Signal_Handler);
 515         signal(SIGCHLD, Signal_Handler);
 516
 517         signal(SIGPIPE, SIG_IGN);
 518 #endif
 519 } /* Initialize_Signal_Handler */
 520
 521
 522 /**
 523  * Signal handler of ngIRCd.
 524  * This function is called whenever ngIRCd catches a signal sent by the
 525  * user and/or the system to it. For example SIGTERM and SIGHUP.
 526  * @param Signal Number of the signal to handle.
 527  */
 528 static void
 529 Signal_Handler( int Signal )
 530 {
 531         switch( Signal )
 532         {
 533                 case SIGTERM:
 534                 case SIGINT:
 535                 case SIGQUIT:
 536                         /* shut down sever */
 537                         NGIRCd_SignalQuit = true;
 538                         break;
 539                 case SIGHUP:
 540                         /* re-read configuration */
 541                         NGIRCd_SignalRehash = true;
 542                         break;
 543                 case SIGCHLD:
 544                         /* child-process exited, avoid zombies */
 545                         while (waitpid( -1, NULL, WNOHANG) > 0)
 546                                 ;
 547                         break;
 548 #ifdef DEBUG
 549                 default:
 550                         /* unbekanntes bzw. unbehandeltes Signal */
 551                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 552 #endif
 553         }
 554 } /* Signal_Handler */
 555
 556
 557 /**
 558  * Display copyright and version information of ngIRCd on the console.
 559  */
 560 static void
 561 Show_Version( void )
 562 {
 563         puts( NGIRCd_Version );
 564         puts( "Copyright (c)2001-2010 Alexander Barton (<alex@barton.de>) and Contributors." );
 565         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 566         puts( "This is free software; see the source for copying conditions. There is NO" );
 567         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 568 } /* Show_Version */
 569
 570
 571 /**
 572  * Display a short help text on the console.
 573  * This help depends on the configuration of the executable and only shows
 574  * options that are actually enabled.
 575  */
 576 static void
 577 Show_Help( void )
 578 {
 579 #ifdef DEBUG
 580         puts( "  -d, --debug        log extra debug messages" );
 581 #endif
 582         puts( "  -f, --config <f>   use file <f> as configuration file" );
 583         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 584         puts( "  -p, --passive      disable automatic connections to other servers" );
 585 #ifdef SNIFFER
 586         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 587 #endif
 588         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 589         puts( "  -V, --version      output version information and exit" );
 590         puts( "  -h, --help         display this help and exit" );
 591 } /* Show_Help */
 592
 593
 594 /**
 595  * Delete the file containing the process ID (PID).
 596  */
 597 static void
 598 Pidfile_Delete( void )
 599 {
 600         /* Pidfile configured? */
 601         if( ! Conf_PidFile[0] ) return;
 602
 603 #ifdef DEBUG
 604         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 605 #endif
 606
 607         if( unlink( Conf_PidFile ))
 608                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 609 } /* Pidfile_Delete */
 610
 611
 612 /**
 613  * Create the file containing the process ID of ngIRCd ("PID file").
 614  * @param pid The process ID to be stored in this file.
 615  */
 616 static void
 617 Pidfile_Create(pid_t pid)
 618 {
 619         int pidfd;
 620         char pidbuf[64];
 621         int len;
 622
 623         /* Pidfile configured? */
 624         if( ! Conf_PidFile[0] ) return;
 625
 626 #ifdef DEBUG
 627         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 628 #endif
 629
 630         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 631         if ( pidfd < 0 ) {
 632                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 633                 return;
 634         }
 635
 636         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 637         if (len < 0 || len >= (int)sizeof pidbuf) {
 638                 Log( LOG_ERR, "Error converting pid");
 639                 return;
 640         }
 641
 642         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 643                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 644
 645         if( close(pidfd) != 0 )
 646                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 647 } /* Pidfile_Create */
 648
 649
 650 /**
 651  * Redirect stdin, stdout and stderr to apropriate file handles.
 652  */
 653 static void
 654 Setup_FDStreams( void )
 655 {
 656         int fd;
 657
 658         /* Test if we can open /dev/null for reading and writing. If not
 659          * we are most probably chrooted already and the server has been
 660          * restarted. So we simply don't try to redirect stdXXX ... */
 661         fd = open( "/dev/null", O_RDWR );
 662         if ( fd < 0 ) {
 663                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 664                 return;
 665         }
 666
 667         fflush(stdout);
 668         fflush(stderr);
 669
 670         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 671         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 672
 673         /* Close newly opened file descriptor if not stdin/out/err */
 674         if( fd > 2 ) close( fd );
 675 } /* Setup_FDStreams */
 676
 677
 678 static bool
 679 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 680 {
 681         struct passwd *pwd;
 682
 683 #ifdef __CYGWIN__
 684         /* Cygwin kludge.
 685          * It can return EINVAL instead of EPERM
 686          * so, if we are already unprivileged,
 687          * use id of current user.
 688          */
 689         if (geteuid() && getuid()) {
 690                 *uid = getuid();
 691                 *gid = getgid();
 692                 return true;
 693         }
 694 #endif
 695
 696         pwd = getpwnam("nobody");
 697         if (!pwd) return false;
 698
 699         if ( !pwd->pw_uid || !pwd->pw_gid)
 700                 return false;
 701
 702         *uid = pwd->pw_uid;
 703         *gid = pwd->pw_gid;
 704         endpwent();
 705
 706         return true;
 707 }
 708
 709
 710 static bool
 711 NGIRCd_Init( bool NGIRCd_NoDaemon )
 712 {
 713         static bool initialized;
 714         bool chrooted = false;
 715         struct passwd *pwd;
 716         struct group *grp;
 717         int real_errno;
 718         pid_t pid;
 719
 720         if (initialized)
 721                 return true;
 722
 723         if (!ConnSSL_InitLibrary())
 724                 Log(LOG_WARNING,
 725                     "Warning: Error during SSL initialization, continuing ...");
 726
 727         if( Conf_Chroot[0] ) {
 728                 if( chdir( Conf_Chroot ) != 0 ) {
 729                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 730                         return false;
 731                 }
 732
 733                 if( chroot( Conf_Chroot ) != 0 ) {
 734                         if (errno != EPERM) {
 735                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 736                                                                 Conf_Chroot, strerror( errno ));
 737
 738                                 return false;
 739                         }
 740                 } else {
 741                         chrooted = true;
 742                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 743                 }
 744         }
 745
 746         if (Conf_UID == 0) {
 747                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 748
 749                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 750                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 751                                         errno ? strerror(errno) : "not found" );
 752                         return false;
 753                 }
 754         }
 755
 756         if (getgid() != Conf_GID) {
 757                 /* Change group ID */
 758                 if (setgid(Conf_GID) != 0) {
 759                         real_errno = errno;
 760                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 761                         if (real_errno != EPERM)
 762                                 return false;
 763                 }
 764         }
 765
 766         if (getuid() != Conf_UID) {
 767                 /* Change user ID */
 768                 if (setuid(Conf_UID) != 0) {
 769                         real_errno = errno;
 770                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 771                         if (real_errno != EPERM)
 772                                 return false;
 773                 }
 774         }
 775
 776         initialized = true;
 777
 778         /* Normally a child process is forked which isn't any longer
 779          * connected to ther controlling terminal. Use "--nodaemon"
 780          * to disable this "daemon mode" (useful for debugging). */
 781         if ( ! NGIRCd_NoDaemon ) {
 782                 pid = fork( );
 783                 if( pid > 0 ) {
 784                         /* "Old" process: exit. */
 785                         exit( 0 );
 786                 }
 787                 if( pid < 0 ) {
 788                         /* Error!? */
 789                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 790                                                                 PACKAGE_NAME, strerror( errno ));
 791                         exit( 1 );
 792                 }
 793
 794                 /* New child process */
 795 #ifndef NeXT
 796                 (void)setsid( );
 797 #else
 798                 setpgrp(0, getpid());
 799 #endif
 800                 if (chdir( "/" ) != 0)
 801                         Log(LOG_ERR, "Can't change directory to '/': %s",
 802                                      strerror(errno));
 803
 804                 /* Detach stdin, stdout and stderr */
 805                 Setup_FDStreams( );
 806         }
 807         pid = getpid();
 808
 809         Pidfile_Create( pid );
 810
 811         /* Check UID/GID we are running as, can be different from values
 812          * configured (e. g. if we were already started with a UID>0. */
 813         Conf_UID = getuid();
 814         Conf_GID = getgid();
 815
 816         pwd = getpwuid( Conf_UID );
 817         grp = getgrgid( Conf_GID );
 818
 819         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 820                                 pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 821                                 grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 822
 823         if (chrooted) {
 824                 Log(LOG_INFO, "Running with root directory \"%s\".",
 825                     Conf_Chroot );
 826                 return true;
 827         } else
 828                 Log(LOG_INFO, "Not running with changed root directory.");
 829
 830         /* Change working directory to home directory of the user
 831          * we are running as (only when running in daemon mode and not in chroot) */
 832
 833         if ( pwd ) {
 834                 if (!NGIRCd_NoDaemon ) {
 835                         if( chdir( pwd->pw_dir ) == 0 )
 836                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 837                         else
 838                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
 839                                                                 pwd->pw_dir, strerror( errno ));
 840                 }
 841         } else {
 842                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 843         }
 844
 845 return true;
 846 }
 847
 848 /* -eof- */