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Date:: Mon Nov 18 18:49:34 2002 UTC
Message:: - Rechtschreibfehler korrigiert ;-)
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1 /*
2  * ngIRCd -- The Next Generation IRC Daemon
3  * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
4  *
5  * Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
6  * der GNU General Public License (GPL), wie von der Free Software Foundation
7  * herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
8  * der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
9  * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
10  * der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
11  *
12  * $Id: ngircd.c,v 1.59 2002/11/18 18:49:34 alex Exp $
13  *
14  * ngircd.c: Hier beginnt alles ;-)
15  */
16 
17 
18 #include "portab.h"
19 
20 #include "imp.h"
21 #include <assert.h>
22 #include <errno.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <signal.h>
26 #include <string.h>
27 #include <unistd.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <sys/wait.h>
31 #include <time.h>
32 #include <pwd.h>
33 #include <grp.h>
34 
35 #include "resolve.h"
36 #include "conn.h"
37 #include "client.h"
38 #include "channel.h"
39 #include "conf.h"
40 #include "cvs-version.h"
41 #include "defines.h"
42 #include "lists.h"
43 #include "log.h"
44 #include "parse.h"
45 #include "irc.h"
46 
47 #include "exp.h"
48 #include "ngircd.h"
49 
50 
51 LOCAL VOID Initialize_Signal_Handler PARAMS(( VOID ));
52 LOCAL VOID Signal_Handler PARAMS(( INT Signal ));
53 
54 LOCAL VOID Initialize_Listen_Ports PARAMS(( VOID ));
55 
56 LOCAL VOID Show_Version PARAMS(( VOID ));
57 LOCAL VOID Show_Help PARAMS(( VOID ));
58 
59 
60 GLOBAL int
61 main( int argc, const char *argv[] )
62 {
63 	struct passwd *pwd;
64 	struct group *grp;
65 	BOOLEAN ok, configtest = FALSE;
66 	LONG pid, n;
67 	INT i;
68 
69 	umask( 0077 );
70 
71 	NGIRCd_Restart = FALSE;
72 	NGIRCd_Quit = FALSE;
73 	NGIRCd_NoDaemon = FALSE;
74 	NGIRCd_Passive = FALSE;
75 #ifdef DEBUG
76 	NGIRCd_Debug = FALSE;
77 #endif
78 #ifdef SNIFFER
79 	NGIRCd_Sniffer = FALSE;
80 #endif
81 	strcpy( NGIRCd_ConfFile, CONFIG_FILE );
82 
83 	/* Kommandozeile parsen */
84 	for( i = 1; i < argc; i++ )
85 	{
86 		ok = FALSE;
87 		if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
88 		{
89 			/* Lange Option */
90 
91 			if( strcmp( argv[i], "--config" ) == 0 )
92 			{
93 				if( i + 1 < argc )
94 				{
95 					/* Ok, danach kommt noch ein Parameter */
96 					strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
97 					NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
98 
99 					/* zum uebernaechsten Parameter */
100 					i++; ok = TRUE;
101 				}
102 			}
103 			if( strcmp( argv[i], "--configtest" ) == 0 )
104 			{
105 				configtest = TRUE;
106 				ok = TRUE;
107 			}
108 #ifdef DEBUG
109 			if( strcmp( argv[i], "--debug" ) == 0 )
110 			{
111 				NGIRCd_Debug = TRUE;
112 				ok = TRUE;
113 			}
114 #endif
115 			if( strcmp( argv[i], "--help" ) == 0 )
116 			{
117 				Show_Version( );
118 				puts( "" ); Show_Help( ); puts( "" );
119 				exit( 1 );
120 			}
121 			if( strcmp( argv[i], "--nodaemon" ) == 0 )
122 			{
123 				NGIRCd_NoDaemon = TRUE;
124 				ok = TRUE;
125 			}
126 			if( strcmp( argv[i], "--passive" ) == 0 )
127 			{
128 				NGIRCd_Passive = TRUE;
129 				ok = TRUE;
130 			}
131 #ifdef SNIFFER
132 			if( strcmp( argv[i], "--sniffer" ) == 0 )
133 			{
134 				NGIRCd_Sniffer = TRUE;
135 				ok = TRUE;
136 			}
137 #endif
138 			if( strcmp( argv[i], "--version" ) == 0 )
139 			{
140 				Show_Version( );
141 				exit( 1 );
142 			}
143 		}
144 		else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
145 		{
146 			/* Kurze Option */
147 			
148 			for( n = 1; n < (LONG)strlen( argv[i] ); n++ )
149 			{
150 				ok = FALSE;
151 #ifdef DEBUG
152 				if( argv[i][n] == 'd' )
153 				{
154 					NGIRCd_Debug = TRUE;
155 					ok = TRUE;
156 				}
157 #endif
158 				if( argv[i][n] == 'f' )
159 				{
160 					if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
161 					{
162 						/* Ok, danach kommt ein Leerzeichen */
163 						strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
164 						NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
165 
166 						/* zum uebernaechsten Parameter */
167 						i++; n = (LONG)strlen( argv[i] );
168 						ok = TRUE;
169 					}
170 				}
171 				if( argv[i][n] == 'n' )
172 				{
173 					NGIRCd_NoDaemon = TRUE;
174 					ok = TRUE;
175 				}
176 				if( argv[i][n] == 'p' )
177 				{
178 					NGIRCd_Passive = TRUE;
179 					ok = TRUE;
180 				}
181 #ifdef SNIFFER
182 				if( argv[i][n] == 's' )
183 				{
184 					NGIRCd_Sniffer = TRUE;
185 					ok = TRUE;
186 				}
187 #endif
188 
189 				if( ! ok )
190 				{
191 					printf( "%s: invalid option \"-%c\"!\n", PACKAGE, argv[i][n] );
192 					printf( "Try \"%s --help\" for more information.\n", PACKAGE );
193 					exit( 1 );
194 				}
195 			}
196 
197 		}
198 		if( ! ok )
199 		{
200 			printf( "%s: invalid option \"%s\"!\n", PACKAGE, argv[i] );
201 			printf( "Try \"%s --help\" for more information.\n", PACKAGE );
202 			exit( 1 );
203 		}
204 	}
205 
206 	/* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
207 	strcpy( NGIRCd_DebugLevel, "" );
208 #ifdef DEBUG
209 	if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
210 #endif
211 #ifdef SNIFFER
212 	if( NGIRCd_Sniffer )
213 	{
214 		NGIRCd_Debug = TRUE;
215 		strcpy( NGIRCd_DebugLevel, "2" );
216 	}
217 #endif
218 
219 	/* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
220 	if( configtest )
221 	{
222 		Show_Version( ); puts( "" );
223 		exit( Conf_Test( ));
224 	}
225 	
226 	while( ! NGIRCd_Quit )
227 	{
228 		/* In der Regel wird ein Sub-Prozess ge-fork()'t, der
229 		 * nicht mehr mit dem Terminal verbunden ist. Mit der
230 		 * Option "--nodaemon" kann dies (z.B. zum Debuggen)
231 		 * verhindert werden. */
232 		if( ! NGIRCd_NoDaemon )
233 		{
234 			/* Daemon im Hintergrund erzeugen */
235 			pid = (LONG)fork( );
236 			if( pid > 0 )
237 			{
238 				/* "alter" Prozess */
239 				exit( 0 );
240 			}
241 			if( pid < 0 )
242 			{
243 				/* Fehler */
244 				printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE, strerror( errno ));
245 				exit( 1 );
246 			}
247 
248 			/* Child-Prozess initialisieren */
249 			(VOID)setsid( );
250 			chdir( "/" );
251 		}
252 	
253 		/* Globale Variablen initialisieren */
254 		NGIRCd_Start = time( NULL );
255 		(VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
256 		NGIRCd_Restart = FALSE;
257 		NGIRCd_Quit = FALSE;
258 
259 		/* Module initialisieren */
260 		Log_Init( );
261 		Resolve_Init( );
262 		Conf_Init( );
263 		Lists_Init( );
264 		Channel_Init( );
265 		Client_Init( );
266 		Conn_Init( );
267 
268 		/* Wenn als root ausgefuehrt und eine andere UID
269 		 * konfiguriert ist, jetzt zu dieser wechseln */
270 		if( getuid( ) == 0 )
271 		{
272 			if( Conf_GID != 0 )
273 			{
274 				/* Neue Group-ID setzen */
275 				if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change Group-ID to %u: %s", Conf_GID, strerror( errno ));
276 			}
277 			if( Conf_UID != 0 )
278 			{
279 				/* Neue User-ID setzen */
280 				if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change User-ID to %u: %s", Conf_UID, strerror( errno ));
281 			}
282 		}
283 		
284 		/* User, Gruppe und Prozess-ID des Daemon ausgeben */
285 		pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
286 		Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.", pwd ? pwd->pw_name : "unknown", (LONG)getuid( ), grp ? grp->gr_name : "unknown", (LONG)getgid( ), (LONG)getpid( ));
287 
288 		/* stderr in "Error-File" umlenken */
289 		Log_InitErrorfile( );
290 
291 		/* Signal-Handler initialisieren */
292 		Initialize_Signal_Handler( );
293 
294 		/* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
295 		 * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
296 		 * sind in doc/Protocol.txt beschrieben. */
297 #ifdef IRCPLUS
298 		sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE, VERSION, IRCPLUSFLAGS );
299 		if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
300 #else
301 		sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE, VERSION );
302 #endif
303 		strcat( NGIRCd_ProtoID, " P" );
304 		Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
305 
306 		/* Vordefinierte Channels anlegen */
307 		Channel_InitPredefined( );
308 
309 		/* Listen-Ports initialisieren */
310 		Initialize_Listen_Ports( );
311 
312 		/* Hauptschleife */
313 		Conn_Handler( );
314 
315 		/* Alles abmelden */
316 		Conn_Exit( );
317 		Client_Exit( );
318 		Channel_Exit( );
319 		Lists_Exit( );
320 		Log_Exit( );
321 	}
322 
323 	return 0;
324 } /* main */
325 
326 
327 GLOBAL CHAR *
328 NGIRCd_Version( VOID )
329 {
330 	STATIC CHAR version[126];
331 	
332 #ifdef CVSDATE
333 	sprintf( version, "%s %s(%s)-%s", PACKAGE, VERSION, CVSDATE, NGIRCd_VersionAddition( ));
334 #else
335 	sprintf( version, "%s %s-%s", PACKAGE, VERSION, NGIRCd_VersionAddition( ));
336 #endif
337 	return version;
338 } /* NGIRCd_Version */
339 
340 
341 GLOBAL CHAR *
342 NGIRCd_VersionAddition( VOID )
343 {
344 	STATIC CHAR txt[64];
345 
346 	strcpy( txt, "" );
347 
348 #ifdef USE_SYSLOG
349 	if( txt[0] ) strcat( txt, "+" );
350 	strcat( txt, "SYSLOG" );
351 #endif
352 #ifdef DEBUG
353 	if( txt[0] ) strcat( txt, "+" );
354 	strcat( txt, "DEBUG" );
355 #endif
356 #ifdef SNIFFER
357 	if( txt[0] ) strcat( txt, "+" );
358 	strcat( txt, "SNIFFER" );
359 #endif
360 #ifdef STRICT_RFC
361 	if( txt[0] ) strcat( txt, "+" );
362 	strcat( txt, "RFC" );
363 #endif
364 #ifdef IRCPLUS
365 	if( txt[0] ) strcat( txt, "+" );
366 	strcat( txt, "IRCPLUS" );
367 #endif
368 	
369 	if( txt[0] ) strcat( txt, "-" );
370 	strcat( txt, TARGET_CPU );
371 	strcat( txt, "/" );
372 	strcat( txt, TARGET_VENDOR );
373 	strcat( txt, "/" );
374 	strcat( txt, TARGET_OS );
375 
376 	return txt;
377 } /* NGIRCd_VersionAddition */
378 
379 
380 LOCAL VOID
381 Initialize_Signal_Handler( VOID )
382 {
383 	/* Signal-Handler initialisieren: einige Signale
384 	 * werden ignoriert, andere speziell behandelt. */
385 
386 #ifdef HAVE_SIGACTION
387 	/* sigaction() ist vorhanden */
388 
389 	struct sigaction saction;
390 
391 	/* Signal-Struktur initialisieren */
392 	memset( &saction, 0, sizeof( saction ));
393 	saction.sa_handler = Signal_Handler;
394 #ifdef SA_RESTART
395 	saction.sa_flags |= SA_RESTART;
396 #endif
397 #ifdef SA_NOCLDWAIT
398 	saction.sa_flags |= SA_NOCLDWAIT;
399 #endif
400 
401 	/* Signal-Handler einhaengen */
402 	sigaction( SIGINT, &saction, NULL );
403 	sigaction( SIGQUIT, &saction, NULL );
404 	sigaction( SIGTERM, &saction, NULL);
405 	sigaction( SIGHUP, &saction, NULL);
406 	sigaction( SIGCHLD, &saction, NULL);
407 
408 	/* einige Signale ignorieren */
409 	saction.sa_handler = SIG_IGN;
410 	sigaction( SIGPIPE, &saction, NULL );
411 #else
412 	/* kein sigaction() vorhanden */
413 
414 	/* Signal-Handler einhaengen */
415 	signal( SIGINT, Signal_Handler );
416 	signal( SIGQUIT, Signal_Handler );
417 	signal( SIGTERM, Signal_Handler );
418 	signal( SIGHUP, Signal_Handler );
419 	signal( SIGCHLD, Signal_Handler );
420 
421 	/* einige Signale ignorieren */
422 	signal( SIGPIPE, SIG_IGN );
423 #endif
424 } /* Initialize_Signal_Handler */
425 
426 
427 LOCAL VOID
428 Signal_Handler( INT Signal )
429 {
430 	/* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
431 	 * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
432 	 * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
433 
434 	switch( Signal )
435 	{
436 		case SIGTERM:
437 		case SIGINT:
438 		case SIGQUIT:
439 			/* wir soll(t)en uns wohl beenden ... */
440 			if( Signal == SIGTERM ) Log( LOG_WARNING, "Got TERM signal, terminating now ..." );
441 			else if( Signal == SIGINT ) Log( LOG_WARNING, "Got INT signal, terminating now ..." );
442 			else if( Signal == SIGQUIT ) Log( LOG_WARNING, "Got QUIT signal, terminating now ..." );
443 			NGIRCd_Quit = TRUE;
444 			break;
445 		case SIGHUP:
446 			/* neu starten */
447 			Log( LOG_WARNING, "Got HUP signal, restarting now ..." );
448 			NGIRCd_Restart = TRUE;
449 			break;
450 		case SIGCHLD:
451 			/* Child-Prozess wurde beendet. Zombies vermeiden: */
452 			while( waitpid( -1, NULL, WNOHANG ) > 0);
453 			break;
454 		default:
455 			/* unbekanntes bzw. unbehandeltes Signal */
456 			Log( LOG_NOTICE, "Got signal %d! Ignored.", Signal );
457 	}
458 } /* Signal_Handler */
459 
460 
461 LOCAL VOID
462 Initialize_Listen_Ports( VOID )
463 {
464 	/* Ports, auf denen der Server Verbindungen entgegennehmen
465 	 * soll, initialisieren */
466 	
467 	INT created, i;
468 
469 	created = 0;
470 	for( i = 0; i < Conf_ListenPorts_Count; i++ )
471 	{
472 		if( Conn_NewListener( Conf_ListenPorts[i] )) created++;
473 		else Log( LOG_ERR, "Can't listen on port %u!", Conf_ListenPorts[i] );
474 	}
475 
476 	if( created < 1 )
477 	{
478 		Log( LOG_ALERT, "Server isn't listening on a single port!" );
479 		Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
480 		exit( 1 );
481 	}
482 } /* Initialize_Listen_Ports */
483 
484 
485 LOCAL VOID
486 Show_Version( VOID )
487 {
488 	puts( NGIRCd_Version( ));
489 	puts( "Copyright (c)2001,2002 by Alexander Barton (<alex@barton.de>)." );
490 	puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
491 	puts( "This is free software; see the source for copying conditions. There is NO" );
492 	puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
493 } /* Show_Version */
494 
495 
496 LOCAL VOID
497 Show_Help( VOID )
498 {
499 #ifdef DEBUG
500 	puts( "  -d, --debug        log extra debug messages" );
501 #endif
502 	puts( "  -f, --config <f>   use file <f> as configuration file" );
503         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
504         puts( "  -p, --passive      disable automatic connections to other servers" );
505 #ifdef SNIFFER
506 	puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
507 #endif
508 	puts( "      --configtest   read, validate and display configuration; then exit" );
509  	puts( "      --version      output version information and exit" );
510 	puts( "      --help         display this help and exit" );
511 } /* Show_Help */
512 
513 
514 /* -eof- */