1eb68b4c94f824950e6b239a5641bff22dbc8ae6
[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 1.116 2007/11/15 01:03:01 fw 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
426         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
427         NGIRCd_SignalRehash = false;
428
429         /* Close down all listening sockets */
430         Conn_ExitListeners( );
431
432         /* Remember old server name */
433         strlcpy( old_name, Conf_ServerName, sizeof old_name );
434
435         /* Re-read configuration ... */
436         Conf_Rehash( );
437
438         /* Recover old server name: it can't be changed during run-time */
439         if( strcmp( old_name, Conf_ServerName ) != 0 )
440         {
441                 strlcpy( Conf_ServerName, old_name, sizeof Conf_ServerName );
442                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
443         }
444
445         /* Create new pre-defined channels */
446         Channel_InitPredefined( );
447         
448         /* Start listening on sockets */
449         Conn_InitListeners( );
450
451         /* Sync configuration with established connections */
452         Conn_SyncServerStruct( );
453
454         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
455 } /* NGIRCd_Rehash */
456
457
458 /**
459  * Initialize the signal handler.
460  */
461 static void
462 Initialize_Signal_Handler( void )
463 {
464         /* Signal-Handler initialisieren: einige Signale
465          * werden ignoriert, andere speziell behandelt. */
466
467 #ifdef HAVE_SIGACTION
468         /* sigaction() ist vorhanden */
469
470         struct sigaction saction;
471
472         /* Signal-Struktur initialisieren */
473         memset( &saction, 0, sizeof( saction ));
474         saction.sa_handler = Signal_Handler;
475 #ifdef SA_RESTART
476         saction.sa_flags |= SA_RESTART;
477 #endif
478 #ifdef SA_NOCLDWAIT
479         saction.sa_flags |= SA_NOCLDWAIT;
480 #endif
481
482         /* Signal-Handler einhaengen */
483         sigaction(SIGINT, &saction, NULL);
484         sigaction(SIGQUIT, &saction, NULL);
485         sigaction(SIGTERM, &saction, NULL);
486         sigaction(SIGHUP, &saction, NULL);
487         sigaction(SIGCHLD, &saction, NULL);
488
489         /* einige Signale ignorieren */
490         saction.sa_handler = SIG_IGN;
491         sigaction(SIGPIPE, &saction, NULL);
492 #else
493         /* kein sigaction() vorhanden */
494
495         /* Signal-Handler einhaengen */
496         signal(SIGINT, Signal_Handler);
497         signal(SIGQUIT, Signal_Handler);
498         signal(SIGTERM, Signal_Handler);
499         signal(SIGHUP, Signal_Handler);
500         signal(SIGCHLD, Signal_Handler);
501
502         /* einige Signale ignorieren */
503         signal(SIGPIPE, SIG_IGN);
504 #endif
505 } /* Initialize_Signal_Handler */
506
507
508 /**
509  * Signal handler of ngIRCd.
510  * This function is called whenever ngIRCd catches a signal sent by the
511  * user and/or the system to it. For example SIGTERM and SIGHUP.
512  * @param Signal Number of the signal to handle.
513  */
514 static void
515 Signal_Handler( int Signal )
516 {
517         switch( Signal )
518         {
519                 case SIGTERM:
520                 case SIGINT:
521                 case SIGQUIT:
522                         /* wir soll(t)en uns wohl beenden ... */
523                         NGIRCd_SignalQuit = true;
524                         break;
525                 case SIGHUP:
526                         /* Konfiguration neu einlesen: */
527                         NGIRCd_SignalRehash = true;
528                         break;
529                 case SIGCHLD:
530                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
531                         while( waitpid( -1, NULL, WNOHANG ) > 0);
532                         break;
533 #ifdef DEBUG
534                 default:
535                         /* unbekanntes bzw. unbehandeltes Signal */
536                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
537 #endif
538         }
539 } /* Signal_Handler */
540
541
542 /**
543  * Display copyright and version information of ngIRCd on the console.
544  */
545 static void
546 Show_Version( void )
547 {
548         puts( NGIRCd_Version );
549         puts( "Copyright (c)2001-2007 Alexander Barton (<alex@barton.de>) and Contributors." );
550         puts( "Homepage: <http://ngircd.barton.de/>\n" );
551         puts( "This is free software; see the source for copying conditions. There is NO" );
552         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
553 } /* Show_Version */
554
555
556 /**
557  * Display a short help text on the console.
558  * This help depends on the configuration of the executable and only shows
559  * options that are actually enabled.
560  */
561 static void
562 Show_Help( void )
563 {
564 #ifdef DEBUG
565         puts( "  -d, --debug        log extra debug messages" );
566 #endif
567         puts( "  -f, --config <f>   use file <f> as configuration file" );
568         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
569         puts( "  -p, --passive      disable automatic connections to other servers" );
570 #ifdef SNIFFER
571         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
572 #endif
573         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
574         puts( "      --version      output version information and exit" );
575         puts( "      --help         display this help and exit" );
576 } /* Show_Help */
577
578
579 /**
580  * Delete the file containing the process ID (PID).
581  */
582 static void
583 Pidfile_Delete( void )
584 {
585         /* Pidfile configured? */
586         if( ! Conf_PidFile[0] ) return;
587
588 #ifdef DEBUG
589         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
590 #endif
591
592         if( unlink( Conf_PidFile ))
593                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
594 } /* Pidfile_Delete */
595
596
597 /**
598  * Create the file containing the process ID of ngIRCd ("PID file").
599  * @param pid The process ID to be stored in this file.
600  */
601 static void
602 Pidfile_Create(pid_t pid)
603 {
604         int pidfd;
605         char pidbuf[64];
606         int len;
607
608         /* Pidfile configured? */
609         if( ! Conf_PidFile[0] ) return;
610
611 #ifdef DEBUG
612         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
613 #endif
614
615         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
616         if ( pidfd < 0 ) {
617                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
618                 return;
619         }
620
621         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
622         if (len < 0 || len >= (int)sizeof pidbuf) {
623                 Log( LOG_ERR, "Error converting pid");
624                 return;
625         }
626         
627         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
628                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
629
630         if( close(pidfd) != 0 )
631                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
632 } /* Pidfile_Create */
633
634
635 /**
636  * Redirect stdin, stdout and stderr to apropriate file handles.
637  */
638 static void
639 Setup_FDStreams( void )
640 {
641         int fd;
642
643         /* Test if we can open /dev/null for reading and writing. If not
644          * we are most probably chrooted already and the server has been
645          * restarted. So we simply don't try to redirect stdXXX ... */
646         fd = open( "/dev/null", O_RDWR );
647         if ( fd < 0 ) {
648                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));      
649                 return;
650         } 
651
652         fflush(stdout);
653         fflush(stderr);
654
655         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
656         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
657
658         /* Close newly opened file descriptor if not stdin/out/err */
659         if( fd > 2 ) close( fd );
660 } /* Setup_FDStreams */
661
662
663 static bool
664 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
665 {
666         struct passwd *pwd;
667
668         pwd = getpwnam("nobody");
669         if (!pwd) return false;
670
671         if ( !pwd->pw_uid || !pwd->pw_gid)
672                 return false;
673
674         *uid = pwd->pw_uid;     
675         *gid = pwd->pw_gid;
676         endpwent();
677
678         return true;    
679 }
680
681
682 static bool
683 NGIRCd_Init( bool NGIRCd_NoDaemon ) 
684 {
685         static bool initialized;
686         bool chrooted = false;
687         struct passwd *pwd;
688         struct group *grp;
689         int real_errno;
690         pid_t pid;
691
692         if (initialized)
693                 return true;
694
695         if( Conf_Chroot[0] ) {
696                 if( chdir( Conf_Chroot ) != 0 ) {
697                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
698                         return false;
699                 }
700
701                 if( chroot( Conf_Chroot ) != 0 ) {
702                         if (errno != EPERM) {
703                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
704                                                                 Conf_Chroot, strerror( errno ));
705
706                                 return false;
707                         }
708                 } else {
709                         chrooted = true;
710                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
711                 }
712         }
713
714         if (Conf_UID == 0) {
715                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
716
717                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
718                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
719                                         errno ? strerror(errno) : "not found" );
720                         return false;
721                 }
722         }
723
724         if (getgid() != Conf_GID) {
725                 /* Change group ID */
726                 if (setgid(Conf_GID) != 0) {
727                         real_errno = errno;
728                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
729                         if (real_errno != EPERM) 
730                                 return false;
731                 }
732         }
733
734         if (getuid() != Conf_UID) {
735                 /* Change user ID */
736                 if (setuid(Conf_UID) != 0) {
737                         real_errno = errno;
738                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
739                         if (real_errno != EPERM) 
740                                 return false;
741                 }
742         }
743
744         initialized = true;
745
746         /* Normally a child process is forked which isn't any longer
747          * connected to ther controlling terminal. Use "--nodaemon"
748          * to disable this "daemon mode" (useful for debugging). */
749         if ( ! NGIRCd_NoDaemon ) {
750                 pid = fork( );
751                 if( pid > 0 ) {
752                         /* "Old" process: exit. */
753                         exit( 0 );
754                 }
755                 if( pid < 0 ) {
756                         /* Error!? */
757                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
758                                                                 PACKAGE_NAME, strerror( errno ));
759                         exit( 1 );
760                 }
761
762                 /* New child process */
763                 (void)setsid( );
764                 chdir( "/" );
765
766                 /* Detach stdin, stdout and stderr */
767                 Setup_FDStreams( );
768         }
769         pid = getpid();
770
771         Pidfile_Create( pid );
772
773         /* Check UID/GID we are running as, can be different from values
774          * configured (e. g. if we were already started with a UID>0. */
775         Conf_UID = getuid();
776         Conf_GID = getgid();
777
778         pwd = getpwuid( Conf_UID );
779         grp = getgrgid( Conf_GID );
780
781         Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
782                                 pwd ? pwd->pw_name : "unknown", Conf_UID,
783                                 grp ? grp->gr_name : "unknown", Conf_GID, pid);
784
785         if ( chrooted ) {
786                 Log( LOG_INFO, "Running chrooted, chrootdir \"%s\".",  Conf_Chroot );
787                 return true;
788         } else {
789                 Log( LOG_INFO, "Not running chrooted." );
790         }
791
792         /* Change working directory to home directory of the user
793          * we are running as (only when running in daemon mode and not in chroot) */
794         
795         if ( pwd ) {
796                 if (!NGIRCd_NoDaemon ) {
797                         if( chdir( pwd->pw_dir ) == 0 ) 
798                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
799                         else 
800                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
801                                                                 pwd->pw_dir, strerror( errno ));
802                 }
803         } else {
804                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
805         }
806
807 return true;
808 }
809
810 /* -eof- */