Introduce option to configure the maximum nick name lenth in ngircd.conf
[ngircd-alex.git] / src / ngircd / ngircd.c
1 /*
2  * ngIRCd -- The Next Generation IRC Daemon
3  * Copyright (c)2001-2007 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 static char UNUSED id[] = "$Id: ngircd.c,v 1.117 2007/11/21 12:16:36 alex Exp $";
16
17 /**
18  * @file
19  * The main program, including the C function main() which is called
20  * by the loader of the operating system.
21  */
22
23 #include "imp.h"
24 #include <assert.h>
25 #include <errno.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <signal.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <time.h>
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #include <sys/wait.h>
35 #include <fcntl.h>
36 #include <pwd.h>
37 #include <grp.h>
38
39 #include "defines.h"
40 #include "resolve.h"
41 #include "conn.h"
42 #include "client.h"
43 #include "channel.h"
44 #include "conf.h"
45 #include "cvs-version.h"
46 #include "lists.h"
47 #include "log.h"
48 #include "parse.h"
49 #include "irc.h"
50
51 #ifdef ZEROCONF
52 #include "rendezvous.h"
53 #endif
54
55 #include "exp.h"
56 #include "ngircd.h"
57
58
59 static void Initialize_Signal_Handler PARAMS(( void ));
60 static void Signal_Handler PARAMS(( int Signal ));
61
62 static void Show_Version PARAMS(( void ));
63 static void Show_Help PARAMS(( void ));
64
65 static void Pidfile_Create PARAMS(( pid_t pid ));
66 static void Pidfile_Delete PARAMS(( void ));
67
68 static void Fill_Version PARAMS(( void ));
69
70 static void Setup_FDStreams PARAMS(( void ));
71
72 static bool NGIRCd_Init PARAMS(( bool ));
73
74 /**
75  * The main() function of ngIRCd.
76  * Here all starts: this function is called by the operating system loader,
77  * it is the first portion of code executed of ngIRCd.
78  * @param argc The number of arguments passed to ngIRCd on the command line.
79  * @param argv An array containing all the arguments passed to ngIRCd.
80  * @return Global exit code of ngIRCd, zero on success.
81  */
82 GLOBAL int
83 main( int argc, const char *argv[] )
84 {
85         bool ok, configtest = false;
86         bool NGIRCd_NoDaemon = false;
87         int i;
88         size_t n;
89
90         umask( 0077 );
91
92         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = 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         /* Kommandozeile parsen */
106         for( i = 1; i < argc; i++ )
107         {
108                 ok = false;
109                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
110                 {
111                         /* Lange Option */
112
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                         /* Kurze Option */
168                         for( n = 1; n < strlen( argv[i] ); n++ )
169                         {
170                                 ok = false;
171 #ifdef DEBUG
172                                 if( argv[i][n] == 'd' )
173                                 {
174                                         NGIRCd_Debug = true;
175                                         ok = true;
176                                 }
177 #endif
178                                 if( argv[i][n] == 'f' )
179                                 {
180                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
181                                         {
182                                                 /* Ok, next character is a blank */
183                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
184
185                                                 /* go to the following parameter */
186                                                 i++;
187                                                 n = strlen( argv[i] );
188                                                 ok = true;
189                                         }
190                                 }
191                                 if( argv[i][n] == 'n' )
192                                 {
193                                         NGIRCd_NoDaemon = true;
194                                         ok = true;
195                                 }
196                                 if( argv[i][n] == 'p' )
197                                 {
198                                         NGIRCd_Passive = true;
199                                         ok = true;
200                                 }
201 #ifdef SNIFFER
202                                 if( argv[i][n] == 's' )
203                                 {
204                                         NGIRCd_Sniffer = true;
205                                         ok = true;
206                                 }
207 #endif
208                                 if( argv[i][n] == 't' )
209                                 {
210                                         configtest = true;
211                                         ok = true;
212                                 }
213
214                                 if( ! ok )
215                                 {
216                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
217                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
218                                         exit( 1 );
219                                 }
220                         }
221
222                 }
223                 if( ! ok )
224                 {
225                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
226                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
227                         exit( 1 );
228                 }
229         }
230
231         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
232         NGIRCd_DebugLevel[0] = '\0';
233 #ifdef DEBUG
234         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
235 #endif
236 #ifdef SNIFFER
237         if( NGIRCd_Sniffer )
238         {
239                 NGIRCd_Debug = true;
240                 strcpy( NGIRCd_DebugLevel, "2" );
241         }
242 #endif
243
244         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
245         if( configtest )
246         {
247                 Show_Version( ); puts( "" );
248                 exit( Conf_Test( ));
249         }
250         
251         while( ! NGIRCd_SignalQuit )
252         {
253                 /* Initialize global variables */
254                 NGIRCd_Start = time( NULL );
255                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
256
257                 NGIRCd_SignalRehash = false;
258                 NGIRCd_SignalRestart = false;
259                 NGIRCd_SignalQuit = false;
260
261                 /* Initialize modules, part I */
262                 Log_Init( ! NGIRCd_NoDaemon );
263                 Conf_Init( );
264
265                 /* Initialize the "main program": chroot environment, user and
266                  * group ID, ... */
267                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
268                         Log(LOG_ALERT, "Fatal: Initialization failed");
269                         exit(1);
270                 }
271
272                 /* Initialize modules, part II: these functions are eventually
273                  * called with already dropped privileges ... */
274                 Channel_Init( );
275                 Client_Init( );
276 #ifdef ZEROCONF
277                 Rendezvous_Init( );
278 #endif
279                 Conn_Init( );
280
281 #ifdef DEBUG
282                 /* Redirect stderr handle to "error file" for debugging
283                  * when not running in "no daemon" mode: */
284                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
285 #endif
286
287                 /* Signal-Handler initialisieren */
288                 Initialize_Signal_Handler( );
289
290                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
291                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
292                  * sind in doc/Protocol.txt beschrieben. */
293 #ifdef IRCPLUS
294                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
295 #ifdef ZLIB
296                 strcat( NGIRCd_ProtoID, "Z" );
297 #endif
298                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
299 #else
300                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
301 #endif
302                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
303 #ifdef ZLIB
304                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
305 #endif
306                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
307
308                 /* Vordefinierte Channels anlegen */
309                 Channel_InitPredefined( );
310
311                 /* Listen-Ports initialisieren */
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 #ifdef ZEROCONF
326                 Rendezvous_Exit( );
327 #endif
328                 Client_Exit( );
329                 Channel_Exit( );
330                 Log_Exit( );
331         }
332         Pidfile_Delete( );
333
334         return 0;
335 } /* main */
336
337
338 /**
339  * Generate ngIRCd "version string".
340  * This string is generated once and then stored in NGIRCd_Version for
341  * further usage, for example by the IRC command VERSION and the --version
342  * command line switch.
343  */
344 static void
345 Fill_Version( void )
346 {
347         NGIRCd_VersionAddition[0] = '\0';
348
349 #ifdef SYSLOG
350         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
351 #endif
352 #ifdef ZLIB
353         if( NGIRCd_VersionAddition[0] )
354                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
355
356         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
357 #endif
358 #ifdef TCPWRAP
359         if( NGIRCd_VersionAddition[0] )
360                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
361
362         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
363 #endif
364 #ifdef ZEROCONF
365         if( NGIRCd_VersionAddition[0] )
366                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
367
368         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
369 #endif
370 #ifdef IDENTAUTH
371         if( NGIRCd_VersionAddition[0] )
372                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
373
374         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
375 #endif
376 #ifdef DEBUG
377         if( NGIRCd_VersionAddition[0] )
378                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
379
380         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
381 #endif
382 #ifdef SNIFFER
383         if( NGIRCd_VersionAddition[0] )
384                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
385
386         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
387 #endif
388 #ifdef STRICT_RFC
389         if( NGIRCd_VersionAddition[0] )
390                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
391
392         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
393 #endif
394 #ifdef IRCPLUS
395         if( NGIRCd_VersionAddition[0] )
396                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
397
398         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
399 #endif
400
401         if( NGIRCd_VersionAddition[0] )
402                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
403
404         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
405         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
406         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
407         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
408         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
409
410 #ifdef CVSDATE
411         snprintf( NGIRCd_Version, sizeof NGIRCd_Version,"%s %s(%s)-%s", PACKAGE_NAME, PACKAGE_VERSION, CVSDATE, NGIRCd_VersionAddition);
412 #else
413         snprintf( NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s", PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
414 #endif
415 } /* Fill_Version */
416
417
418 /**
419  * Reload the server configuration file.
420  */
421 GLOBAL void
422 NGIRCd_Rehash( void )
423 {
424         char old_name[CLIENT_ID_LEN];
425         unsigned old_nicklen;
426
427         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
428         NGIRCd_SignalRehash = false;
429
430         /* Close down all listening sockets */
431         Conn_ExitListeners( );
432
433         /* Remember old server name and nick name length */
434         strlcpy( old_name, Conf_ServerName, sizeof old_name );
435         old_nicklen = Conf_MaxNickLength;
436
437         /* Re-read configuration ... */
438         Conf_Rehash( );
439
440         /* Recover old server name and nick name length: these values can't
441          * be changed during run-time */
442         if (strcmp(old_name, Conf_ServerName) != 0 ) {
443                 strlcpy(Conf_ServerName, old_name, sizeof Conf_ServerName);
444                 Log(LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name.");
445         }
446         if (old_nicklen != Conf_MaxNickLength) {
447                 Conf_MaxNickLength = old_nicklen;
448                 Log(LOG_ERR, "Can't change \"MaxNickLength\" on runtime! Ignored new value.");
449         }
450
451         /* Create new pre-defined channels */
452         Channel_InitPredefined( );
453         
454         /* Start listening on sockets */
455         Conn_InitListeners( );
456
457         /* Sync configuration with established connections */
458         Conn_SyncServerStruct( );
459
460         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
461 } /* NGIRCd_Rehash */
462
463
464 /**
465  * Initialize the signal handler.
466  */
467 static void
468 Initialize_Signal_Handler( void )
469 {
470         /* Signal-Handler initialisieren: einige Signale
471          * werden ignoriert, andere speziell behandelt. */
472
473 #ifdef HAVE_SIGACTION
474         /* sigaction() ist vorhanden */
475
476         struct sigaction saction;
477
478         /* Signal-Struktur initialisieren */
479         memset( &saction, 0, sizeof( saction ));
480         saction.sa_handler = Signal_Handler;
481 #ifdef SA_RESTART
482         saction.sa_flags |= SA_RESTART;
483 #endif
484 #ifdef SA_NOCLDWAIT
485         saction.sa_flags |= SA_NOCLDWAIT;
486 #endif
487
488         /* Signal-Handler einhaengen */
489         sigaction(SIGINT, &saction, NULL);
490         sigaction(SIGQUIT, &saction, NULL);
491         sigaction(SIGTERM, &saction, NULL);
492         sigaction(SIGHUP, &saction, NULL);
493         sigaction(SIGCHLD, &saction, NULL);
494
495         /* einige Signale ignorieren */
496         saction.sa_handler = SIG_IGN;
497         sigaction(SIGPIPE, &saction, NULL);
498 #else
499         /* kein sigaction() vorhanden */
500
501         /* Signal-Handler einhaengen */
502         signal(SIGINT, Signal_Handler);
503         signal(SIGQUIT, Signal_Handler);
504         signal(SIGTERM, Signal_Handler);
505         signal(SIGHUP, Signal_Handler);
506         signal(SIGCHLD, Signal_Handler);
507
508         /* einige Signale ignorieren */
509         signal(SIGPIPE, SIG_IGN);
510 #endif
511 } /* Initialize_Signal_Handler */
512
513
514 /**
515  * Signal handler of ngIRCd.
516  * This function is called whenever ngIRCd catches a signal sent by the
517  * user and/or the system to it. For example SIGTERM and SIGHUP.
518  * @param Signal Number of the signal to handle.
519  */
520 static void
521 Signal_Handler( int Signal )
522 {
523         switch( Signal )
524         {
525                 case SIGTERM:
526                 case SIGINT:
527                 case SIGQUIT:
528                         /* wir soll(t)en uns wohl beenden ... */
529                         NGIRCd_SignalQuit = true;
530                         break;
531                 case SIGHUP:
532                         /* Konfiguration neu einlesen: */
533                         NGIRCd_SignalRehash = true;
534                         break;
535                 case SIGCHLD:
536                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
537                         while( waitpid( -1, NULL, WNOHANG ) > 0);
538                         break;
539 #ifdef DEBUG
540                 default:
541                         /* unbekanntes bzw. unbehandeltes Signal */
542                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
543 #endif
544         }
545 } /* Signal_Handler */
546
547
548 /**
549  * Display copyright and version information of ngIRCd on the console.
550  */
551 static void
552 Show_Version( void )
553 {
554         puts( NGIRCd_Version );
555         puts( "Copyright (c)2001-2007 Alexander Barton (<alex@barton.de>) and Contributors." );
556         puts( "Homepage: <http://ngircd.barton.de/>\n" );
557         puts( "This is free software; see the source for copying conditions. There is NO" );
558         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
559 } /* Show_Version */
560
561
562 /**
563  * Display a short help text on the console.
564  * This help depends on the configuration of the executable and only shows
565  * options that are actually enabled.
566  */
567 static void
568 Show_Help( void )
569 {
570 #ifdef DEBUG
571         puts( "  -d, --debug        log extra debug messages" );
572 #endif
573         puts( "  -f, --config <f>   use file <f> as configuration file" );
574         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
575         puts( "  -p, --passive      disable automatic connections to other servers" );
576 #ifdef SNIFFER
577         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
578 #endif
579         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
580         puts( "      --version      output version information and exit" );
581         puts( "      --help         display this help and exit" );
582 } /* Show_Help */
583
584
585 /**
586  * Delete the file containing the process ID (PID).
587  */
588 static void
589 Pidfile_Delete( void )
590 {
591         /* Pidfile configured? */
592         if( ! Conf_PidFile[0] ) return;
593
594 #ifdef DEBUG
595         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
596 #endif
597
598         if( unlink( Conf_PidFile ))
599                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
600 } /* Pidfile_Delete */
601
602
603 /**
604  * Create the file containing the process ID of ngIRCd ("PID file").
605  * @param pid The process ID to be stored in this file.
606  */
607 static void
608 Pidfile_Create(pid_t pid)
609 {
610         int pidfd;
611         char pidbuf[64];
612         int len;
613
614         /* Pidfile configured? */
615         if( ! Conf_PidFile[0] ) return;
616
617 #ifdef DEBUG
618         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
619 #endif
620
621         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
622         if ( pidfd < 0 ) {
623                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
624                 return;
625         }
626
627         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
628         if (len < 0 || len >= (int)sizeof pidbuf) {
629                 Log( LOG_ERR, "Error converting pid");
630                 return;
631         }
632         
633         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
634                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
635
636         if( close(pidfd) != 0 )
637                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
638 } /* Pidfile_Create */
639
640
641 /**
642  * Redirect stdin, stdout and stderr to apropriate file handles.
643  */
644 static void
645 Setup_FDStreams( void )
646 {
647         int fd;
648
649         /* Test if we can open /dev/null for reading and writing. If not
650          * we are most probably chrooted already and the server has been
651          * restarted. So we simply don't try to redirect stdXXX ... */
652         fd = open( "/dev/null", O_RDWR );
653         if ( fd < 0 ) {
654                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));      
655                 return;
656         } 
657
658         fflush(stdout);
659         fflush(stderr);
660
661         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
662         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
663
664         /* Close newly opened file descriptor if not stdin/out/err */
665         if( fd > 2 ) close( fd );
666 } /* Setup_FDStreams */
667
668
669 static bool
670 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
671 {
672         struct passwd *pwd;
673
674         pwd = getpwnam("nobody");
675         if (!pwd) return false;
676
677         if ( !pwd->pw_uid || !pwd->pw_gid)
678                 return false;
679
680         *uid = pwd->pw_uid;     
681         *gid = pwd->pw_gid;
682         endpwent();
683
684         return true;    
685 }
686
687
688 static bool
689 NGIRCd_Init( bool NGIRCd_NoDaemon ) 
690 {
691         static bool initialized;
692         bool chrooted = false;
693         struct passwd *pwd;
694         struct group *grp;
695         int real_errno;
696         pid_t pid;
697
698         if (initialized)
699                 return true;
700
701         if( Conf_Chroot[0] ) {
702                 if( chdir( Conf_Chroot ) != 0 ) {
703                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
704                         return false;
705                 }
706
707                 if( chroot( Conf_Chroot ) != 0 ) {
708                         if (errno != EPERM) {
709                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
710                                                                 Conf_Chroot, strerror( errno ));
711
712                                 return false;
713                         }
714                 } else {
715                         chrooted = true;
716                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
717                 }
718         }
719
720         if (Conf_UID == 0) {
721                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
722
723                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
724                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
725                                         errno ? strerror(errno) : "not found" );
726                         return false;
727                 }
728         }
729
730         if (getgid() != Conf_GID) {
731                 /* Change group ID */
732                 if (setgid(Conf_GID) != 0) {
733                         real_errno = errno;
734                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
735                         if (real_errno != EPERM) 
736                                 return false;
737                 }
738         }
739
740         if (getuid() != Conf_UID) {
741                 /* Change user ID */
742                 if (setuid(Conf_UID) != 0) {
743                         real_errno = errno;
744                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
745                         if (real_errno != EPERM) 
746                                 return false;
747                 }
748         }
749
750         initialized = true;
751
752         /* Normally a child process is forked which isn't any longer
753          * connected to ther controlling terminal. Use "--nodaemon"
754          * to disable this "daemon mode" (useful for debugging). */
755         if ( ! NGIRCd_NoDaemon ) {
756                 pid = fork( );
757                 if( pid > 0 ) {
758                         /* "Old" process: exit. */
759                         exit( 0 );
760                 }
761                 if( pid < 0 ) {
762                         /* Error!? */
763                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
764                                                                 PACKAGE_NAME, strerror( errno ));
765                         exit( 1 );
766                 }
767
768                 /* New child process */
769                 (void)setsid( );
770                 chdir( "/" );
771
772                 /* Detach stdin, stdout and stderr */
773                 Setup_FDStreams( );
774         }
775         pid = getpid();
776
777         Pidfile_Create( pid );
778
779         /* Check UID/GID we are running as, can be different from values
780          * configured (e. g. if we were already started with a UID>0. */
781         Conf_UID = getuid();
782         Conf_GID = getgid();
783
784         pwd = getpwuid( Conf_UID );
785         grp = getgrgid( Conf_GID );
786
787         Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
788                                 pwd ? pwd->pw_name : "unknown", Conf_UID,
789                                 grp ? grp->gr_name : "unknown", Conf_GID, pid);
790
791         if ( chrooted ) {
792                 Log( LOG_INFO, "Running chrooted, chrootdir \"%s\".",  Conf_Chroot );
793                 return true;
794         } else {
795                 Log( LOG_INFO, "Not running chrooted." );
796         }
797
798         /* Change working directory to home directory of the user
799          * we are running as (only when running in daemon mode and not in chroot) */
800         
801         if ( pwd ) {
802                 if (!NGIRCd_NoDaemon ) {
803                         if( chdir( pwd->pw_dir ) == 0 ) 
804                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
805                         else 
806                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
807                                                                 pwd->pw_dir, strerror( errno ));
808                 }
809         } else {
810                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
811         }
812
813 return true;
814 }
815
816 /* -eof- */