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Date:: Sat Sep 7 17:57:17 2002 UTC
Message:: - IRC+-Protokoll ist nun abschaltbar; Versionsstring angepasst.
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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 1.54 2002/09/07 17:57:17 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 
33 #include "resolve.h"
34 #include "conn.h"
35 #include "client.h"
36 #include "channel.h"
37 #include "conf.h"
38 #include "defines.h"
39 #include "lists.h"
40 #include "log.h"
41 #include "parse.h"
42 #include "irc.h"
43 
44 #include "exp.h"
45 #include "ngircd.h"
46 
47 
48 LOCAL VOID Initialize_Signal_Handler PARAMS(( VOID ));
49 LOCAL VOID Signal_Handler PARAMS(( INT Signal ));
50 
51 LOCAL VOID Initialize_Listen_Ports PARAMS(( VOID ));
52 
53 LOCAL VOID Show_Version PARAMS(( VOID ));
54 LOCAL VOID Show_Help PARAMS(( VOID ));
55 
56 
57 GLOBAL int
58 main( int argc, const char *argv[] )
59 {
60 	BOOLEAN ok, configtest = FALSE;
61 	INT32 pid, n;
62 	INT i;
63 
64 	umask( 0077 );
65 
66 	NGIRCd_Restart = FALSE;
67 	NGIRCd_Quit = FALSE;
68 	NGIRCd_NoDaemon = FALSE;
69 	NGIRCd_Passive = FALSE;
70 #ifdef DEBUG
71 	NGIRCd_Debug = FALSE;
72 #endif
73 #ifdef SNIFFER
74 	NGIRCd_Sniffer = FALSE;
75 #endif
76 	strcpy( NGIRCd_ConfFile, CONFIG_FILE );
77 
78 	/* Kommandozeile parsen */
79 	for( i = 1; i < argc; i++ )
80 	{
81 		ok = FALSE;
82 		if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
83 		{
84 			/* Lange Option */
85 
86 			if( strcmp( argv[i], "--config" ) == 0 )
87 			{
88 				if( i + 1 < argc )
89 				{
90 					/* Ok, danach kommt noch ein Parameter */
91 					strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
92 					NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
93 
94 					/* zum uebernaechsten Parameter */
95 					i++; ok = TRUE;
96 				}
97 			}
98 			if( strcmp( argv[i], "--configtest" ) == 0 )
99 			{
100 				configtest = TRUE;
101 				ok = TRUE;
102 			}
103 #ifdef DEBUG
104 			if( strcmp( argv[i], "--debug" ) == 0 )
105 			{
106 				NGIRCd_Debug = TRUE;
107 				ok = TRUE;
108 			}
109 #endif
110 			if( strcmp( argv[i], "--help" ) == 0 )
111 			{
112 				Show_Version( );
113 				puts( "" ); Show_Help( ); puts( "" );
114 				exit( 1 );
115 			}
116 			if( strcmp( argv[i], "--nodaemon" ) == 0 )
117 			{
118 				NGIRCd_NoDaemon = TRUE;
119 				ok = TRUE;
120 			}
121 			if( strcmp( argv[i], "--passive" ) == 0 )
122 			{
123 				NGIRCd_Passive = TRUE;
124 				ok = TRUE;
125 			}
126 #ifdef SNIFFER
127 			if( strcmp( argv[i], "--sniffer" ) == 0 )
128 			{
129 				NGIRCd_Sniffer = TRUE;
130 				ok = TRUE;
131 			}
132 #endif
133 			if( strcmp( argv[i], "--version" ) == 0 )
134 			{
135 				Show_Version( );
136 				exit( 1 );
137 			}
138 		}
139 		else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
140 		{
141 			/* Kurze Option */
142 			
143 			for( n = 1; n < (INT32)strlen( argv[i] ); n++ )
144 			{
145 				ok = FALSE;
146 #ifdef DEBUG
147 				if( argv[i][n] == 'd' )
148 				{
149 					NGIRCd_Debug = TRUE;
150 					ok = TRUE;
151 				}
152 #endif
153 				if( argv[i][n] == 'f' )
154 				{
155 					if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
156 					{
157 						/* Ok, danach kommt ein Leerzeichen */
158 						strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
159 						NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
160 
161 						/* zum uebernaechsten Parameter */
162 						i++; n = strlen( argv[i] );
163 						ok = TRUE;
164 					}
165 				}
166 				if( argv[i][n] == 'n' )
167 				{
168 					NGIRCd_NoDaemon = TRUE;
169 					ok = TRUE;
170 				}
171 				if( argv[i][n] == 'p' )
172 				{
173 					NGIRCd_Passive = TRUE;
174 					ok = TRUE;
175 				}
176 #ifdef SNIFFER
177 				if( argv[i][n] == 's' )
178 				{
179 					NGIRCd_Sniffer = TRUE;
180 					ok = TRUE;
181 				}
182 #endif
183 
184 				if( ! ok )
185 				{
186 					printf( "%s: invalid option \"-%c\"!\n", PACKAGE, argv[i][n] );
187 					printf( "Try \"%s --help\" for more information.\n", PACKAGE );
188 					exit( 1 );
189 				}
190 			}
191 
192 		}
193 		if( ! ok )
194 		{
195 			printf( "%s: invalid option \"%s\"!\n", PACKAGE, argv[i] );
196 			printf( "Try \"%s --help\" for more information.\n", PACKAGE );
197 			exit( 1 );
198 		}
199 	}
200 
201 	/* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
202 	strcpy( NGIRCd_DebugLevel, "" );
203 #ifdef DEBUG
204 	if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
205 #endif
206 #ifdef SNIFFER
207 	if( NGIRCd_Sniffer )
208 	{
209 		NGIRCd_Debug = TRUE;
210 		strcpy( NGIRCd_DebugLevel, "2" );
211 	}
212 #endif
213 
214 	/* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
215 	if( configtest )
216 	{
217 		Show_Version( ); puts( "" );
218 		exit( Conf_Test( ));
219 	}
220 	
221 	while( ! NGIRCd_Quit )
222 	{
223 		/* In der Regel wird ein Sub-Prozess ge-fork()'t, der
224 		 * nicht mehr mit dem Terminal verbunden ist. Mit der
225 		 * Option "--nodaemon" kann dies (z.B. zum Debuggen)
226 		 * verhindert werden. */
227 		if( ! NGIRCd_NoDaemon )
228 		{
229 			/* Daemon im Hintergrund erzeugen */
230 			pid = (INT32)fork( );
231 			if( pid > 0 )
232 			{
233 				/* "alter" Prozess */
234 				exit( 0 );
235 			}
236 			if( pid < 0 )
237 			{
238 				/* Fehler */
239 				printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE, strerror( errno ));
240 				exit( 1 );
241 			}
242 
243 			/* Child-Prozess initialisieren */
244 			(VOID)setsid( );
245 			chdir( "/" );
246 		}
247 	
248 		/* Globale Variablen initialisieren */
249 		NGIRCd_Start = time( NULL );
250 		(VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
251 		NGIRCd_Restart = FALSE;
252 		NGIRCd_Quit = FALSE;
253 
254 		/* Module initialisieren */
255 		Log_Init( );
256 		Resolve_Init( );
257 		Conf_Init( );
258 		Lists_Init( );
259 		Channel_Init( );
260 		Client_Init( );
261 		Conn_Init( );
262 
263 		/* Wenn als root ausgefuehrt und eine andere UID
264 		 * konfiguriert ist, jetzt zu dieser wechseln */
265 		if( getuid( ) == 0 )
266 		{
267 			if( Conf_GID != 0 )
268 			{
269 				/* Neue Group-ID setzen */
270 				if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change Group-ID to %u: %s", Conf_GID, strerror( errno ));
271 			}
272 			if( Conf_UID != 0 )
273 			{
274 				/* Neue User-ID setzen */
275 				if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change User-ID to %u: %s", Conf_UID, strerror( errno ));
276 			}
277 		}
278 		Log( LOG_INFO, "Running as user %ld, group %ld, with PID %ld.", (INT32)getuid( ), (INT32)getgid( ), (INT32)getpid( ));
279 
280 		Log_InitErrorfile( );
281 
282 		/* Signal-Handler initialisieren */
283 		Initialize_Signal_Handler( );
284 
285 		/* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
286 		 * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
287 		 * sind in doc/Protocol.txt beschrieben. */
288 #ifdef IRCPLUS
289 		sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE, VERSION, IRCPLUSFLAGS );
290 		if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
291 #else
292 		sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE, VERSION );
293 #endif
294 		strcat( NGIRCd_ProtoID, " P" );
295 		Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
296 
297 		/* Vordefinierte Channels anlegen */
298 		Channel_InitPredefined( );
299 
300 		/* Listen-Ports initialisieren */
301 		Initialize_Listen_Ports( );
302 
303 		/* Hauptschleife */
304 		Conn_Handler( );
305 
306 		/* Alles abmelden */
307 		Conn_Exit( );
308 		Client_Exit( );
309 		Channel_Exit( );
310 		Lists_Exit( );
311 		Log_Exit( );
312 	}
313 
314 	return 0;
315 } /* main */
316 
317 
318 GLOBAL CHAR *
319 NGIRCd_Version( VOID )
320 {
321 	STATIC CHAR version[126];
322 
323 	sprintf( version, "%s %s-%s", PACKAGE, VERSION, NGIRCd_VersionAddition( ));
324 	return version;
325 } /* NGIRCd_Version */
326 
327 
328 GLOBAL CHAR *
329 NGIRCd_VersionAddition( VOID )
330 {
331 	STATIC CHAR txt[64];
332 
333 	strcpy( txt, "" );
334 
335 #ifdef USE_SYSLOG
336 	if( txt[0] ) strcat( txt, "+" );
337 	strcat( txt, "SYSLOG" );
338 #endif
339 #ifdef DEBUG
340 	if( txt[0] ) strcat( txt, "+" );
341 	strcat( txt, "DEBUG" );
342 #endif
343 #ifdef SNIFFER
344 	if( txt[0] ) strcat( txt, "+" );
345 	strcat( txt, "SNIFFER" );
346 #endif
347 #ifdef STRICT_RFC
348 	if( txt[0] ) strcat( txt, "+" );
349 	strcat( txt, "RFC" );
350 #endif
351 #ifdef IRCPLUS
352 	if( txt[0] ) strcat( txt, "+" );
353 	strcat( txt, "IRCPLUS" );
354 #endif
355 	
356 	if( txt[0] ) strcat( txt, "-" );
357 	strcat( txt, TARGET_CPU );
358 	strcat( txt, "/" );
359 	strcat( txt, TARGET_VENDOR );
360 	strcat( txt, "/" );
361 	strcat( txt, TARGET_OS );
362 
363 	return txt;
364 } /* NGIRCd_VersionAddition */
365 
366 
367 LOCAL VOID
368 Initialize_Signal_Handler( VOID )
369 {
370 	/* Signal-Handler initialisieren: einige Signale
371 	 * werden ignoriert, andere speziell behandelt. */
372 
373 #ifdef HAVE_SIGACTION
374 	/* sigaction() ist vorhanden */
375 
376 	struct sigaction saction;
377 
378 	/* Signal-Struktur initialisieren */
379 	memset( &saction, 0, sizeof( saction ));
380 	saction.sa_handler = Signal_Handler;
381 #ifdef SA_RESTART
382 	saction.sa_flags |= SA_RESTART;
383 #endif
384 #ifdef SA_NOCLDWAIT
385 	saction.sa_flags |= SA_NOCLDWAIT;
386 #endif
387 
388 	/* Signal-Handler einhaengen */
389 	sigaction( SIGINT, &saction, NULL );
390 	sigaction( SIGQUIT, &saction, NULL );
391 	sigaction( SIGTERM, &saction, NULL);
392 	sigaction( SIGHUP, &saction, NULL);
393 	sigaction( SIGCHLD, &saction, NULL);
394 
395 	/* einige Signale ignorieren */
396 	saction.sa_handler = SIG_IGN;
397 	sigaction( SIGPIPE, &saction, NULL );
398 #else
399 	/* kein sigaction() vorhanden */
400 
401 	/* Signal-Handler einhaengen */
402 	signal( SIGINT, Signal_Handler );
403 	signal( SIGQUIT, Signal_Handler );
404 	signal( SIGTERM, Signal_Handler );
405 	signal( SIGHUP, Signal_Handler );
406 	signal( SIGCHLD, Signal_Handler );
407 
408 	/* einige Signale ignorieren */
409 	signal( SIGPIPE, SIG_IGN );
410 #endif
411 } /* Initialize_Signal_Handler */
412 
413 
414 LOCAL VOID
415 Signal_Handler( INT Signal )
416 {
417 	/* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
418 	 * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
419 	 * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
420 
421 	switch( Signal )
422 	{
423 		case SIGTERM:
424 		case SIGINT:
425 		case SIGQUIT:
426 			/* wir soll(t)en uns wohl beenden ... */
427 			if( Signal == SIGTERM ) Log( LOG_WARNING, "Got TERM signal, terminating now ..." );
428 			else if( Signal == SIGINT ) Log( LOG_WARNING, "Got INT signal, terminating now ..." );
429 			else if( Signal == SIGQUIT ) Log( LOG_WARNING, "Got QUIT signal, terminating now ..." );
430 			NGIRCd_Quit = TRUE;
431 			break;
432 		case SIGHUP:
433 			/* neu starten */
434 			Log( LOG_WARNING, "Got HUP signal, restarting now ..." );
435 			NGIRCd_Restart = TRUE;
436 			break;
437 		case SIGCHLD:
438 			/* Child-Prozess wurde beendet. Zombies vermeiden: */
439 			while( waitpid( -1, NULL, WNOHANG ) > 0);
440 			break;
441 		default:
442 			/* unbekanntes bzw. unbehandeltes Signal */
443 			Log( LOG_NOTICE, "Got signal %d! Ignored.", Signal );
444 	}
445 } /* Signal_Handler */
446 
447 
448 LOCAL VOID
449 Initialize_Listen_Ports( VOID )
450 {
451 	/* Ports, auf denen der Server Verbindungen entgegennehmen
452 	 * soll, initialisieren */
453 	
454 	UINT created, i;
455 
456 	created = 0;
457 	for( i = 0; i < Conf_ListenPorts_Count; i++ )
458 	{
459 		if( Conn_NewListener( Conf_ListenPorts[i] )) created++;
460 		else Log( LOG_ERR, "Can't listen on port %u!", Conf_ListenPorts[i] );
461 	}
462 
463 	if( created < 1 )
464 	{
465 		Log( LOG_ALERT, "Server isn't listening on a single port!" );
466 		Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
467 		exit( 1 );
468 	}
469 } /* Initialize_Listen_Ports */
470 
471 
472 LOCAL VOID
473 Show_Version( VOID )
474 {
475 	puts( NGIRCd_Version( ));
476 	puts( "Copyright (c)2001,2002 by Alexander Barton (<alex@barton.de>)." );
477 	puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
478 	puts( "This is free software; see the source for copying conditions. There is NO" );
479 	puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
480 } /* Show_Version */
481 
482 
483 LOCAL VOID
484 Show_Help( VOID )
485 {
486 #ifdef DEBUG
487 	puts( "  -d, --debug        log extra debug messages" );
488 #endif
489 	puts( "  -f, --config <f>   use file <f> as configuration file" );
490         puts( "  -n, --nodaemon     don't fork and don't detatch from controlling terminal" );
491         puts( "  -p, --passive      disable automatic connections to other servers" );
492 #ifdef SNIFFER
493 	puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
494 #endif
495 	puts( "      --configtest   read, validate and display configuration; then exit" );
496  	puts( "      --version      output version information and exit" );
497 	puts( "      --help         display this help and exit" );
498 } /* Show_Help */
499 
500 
501 /* -eof- */