1 /*
2  * ngIRCd -- The Next Generation IRC Daemon
3  * Copyright (c)2001-2004 by 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  * Main program -- main()
12  */
13 
14 
15 #include "portab.h"
16 
17 static char UNUSED id[] = "$Id: ngircd.c,v 1.86 2004/09/04 20:28:51 alex Exp $";
18 
19 #include "imp.h"
20 #include <assert.h>
21 #include <errno.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <signal.h>
25 #include <string.h>
26 #include <unistd.h>
27 #include <time.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <sys/wait.h>
31 #include <pwd.h>
32 #include <grp.h>
33 
34 #include "defines.h"
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 "lists.h"
42 #include "log.h"
43 #include "parse.h"
44 #include "irc.h"
45 
46 #ifdef RENDEZVOUS
47 #include "rendezvous.h"
48 #endif
49 
50 #include "exp.h"
51 #include "ngircd.h"
52 
53 
54 LOCAL VOID Initialize_Signal_Handler PARAMS(( VOID ));
55 LOCAL VOID Signal_Handler PARAMS(( INT Signal ));
56 
57 LOCAL VOID Show_Version PARAMS(( VOID ));
58 LOCAL VOID Show_Help PARAMS(( VOID ));
59 
60 
61 GLOBAL int
62 main( int argc, const char *argv[] )
63 {
64 	struct passwd *pwd;
65 	struct group *grp;
66 	BOOLEAN ok, configtest = FALSE;
67 	LONG pid, n;
68 	INT i;
69 
70 	umask( 0077 );
71 
72 	NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = FALSE;
73 	NGIRCd_NoDaemon = NGIRCd_Passive = FALSE;
74 #ifdef DEBUG
75 	NGIRCd_Debug = FALSE;
76 #endif
77 #ifdef SNIFFER
78 	NGIRCd_Sniffer = FALSE;
79 #endif
80 	strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
81 	strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
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, there's an parameter left */
96 					strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
97 
98 					/* next parameter */
99 					i++; ok = TRUE;
100 				}
101 			}
102 			if( strcmp( argv[i], "--configtest" ) == 0 )
103 			{
104 				configtest = TRUE;
105 				ok = TRUE;
106 			}
107 #ifdef DEBUG
108 			if( strcmp( argv[i], "--debug" ) == 0 )
109 			{
110 				NGIRCd_Debug = TRUE;
111 				ok = TRUE;
112 			}
113 #endif
114 			if( strcmp( argv[i], "--help" ) == 0 )
115 			{
116 				Show_Version( );
117 				puts( "" ); Show_Help( ); puts( "" );
118 				exit( 1 );
119 			}
120 			if( strcmp( argv[i], "--nodaemon" ) == 0 )
121 			{
122 				NGIRCd_NoDaemon = TRUE;
123 				ok = TRUE;
124 			}
125 			if( strcmp( argv[i], "--passive" ) == 0 )
126 			{
127 				NGIRCd_Passive = TRUE;
128 				ok = TRUE;
129 			}
130 #ifdef SNIFFER
131 			if( strcmp( argv[i], "--sniffer" ) == 0 )
132 			{
133 				NGIRCd_Sniffer = TRUE;
134 				ok = TRUE;
135 			}
136 #endif
137 			if( strcmp( argv[i], "--version" ) == 0 )
138 			{
139 				Show_Version( );
140 				exit( 1 );
141 			}
142 		}
143 		else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
144 		{
145 			/* Kurze Option */
146 			
147 			for( n = 1; n < (LONG)strlen( argv[i] ); n++ )
148 			{
149 				ok = FALSE;
150 #ifdef DEBUG
151 				if( argv[i][n] == 'd' )
152 				{
153 					NGIRCd_Debug = TRUE;
154 					ok = TRUE;
155 				}
156 #endif
157 				if( argv[i][n] == 'f' )
158 				{
159 					if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
160 					{
161 						/* Ok, next character is a blank */
162 						strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
163 
164 						/* go to the following parameter */
165 						i++; n = (LONG)strlen( argv[i] );
166 						ok = TRUE;
167 					}
168 				}
169 				if( argv[i][n] == 'n' )
170 				{
171 					NGIRCd_NoDaemon = TRUE;
172 					ok = TRUE;
173 				}
174 				if( argv[i][n] == 'p' )
175 				{
176 					NGIRCd_Passive = TRUE;
177 					ok = TRUE;
178 				}
179 #ifdef SNIFFER
180 				if( argv[i][n] == 's' )
181 				{
182 					NGIRCd_Sniffer = TRUE;
183 					ok = TRUE;
184 				}
185 #endif
186 				if( argv[i][n] == 't' )
187 				{
188 					configtest = TRUE;
189 					ok = TRUE;
190 				}
191 
192 				if( ! ok )
193 				{
194 					printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
195 					printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
196 					exit( 1 );
197 				}
198 			}
199 
200 		}
201 		if( ! ok )
202 		{
203 			printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
204 			printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
205 			exit( 1 );
206 		}
207 	}
208 
209 	/* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
210 	strcpy( NGIRCd_DebugLevel, "" );
211 #ifdef DEBUG
212 	if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
213 #endif
214 #ifdef SNIFFER
215 	if( NGIRCd_Sniffer )
216 	{
217 		NGIRCd_Debug = TRUE;
218 		strcpy( NGIRCd_DebugLevel, "2" );
219 	}
220 #endif
221 
222 	/* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
223 	if( configtest )
224 	{
225 		Show_Version( ); puts( "" );
226 		exit( Conf_Test( ));
227 	}
228 	
229 	while( ! NGIRCd_SignalQuit )
230 	{
231 		/* Initialize global variables */
232 		NGIRCd_Start = time( NULL );
233 		(VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
234 
235 		NGIRCd_SignalRehash = FALSE;
236 		NGIRCd_SignalRestart = FALSE;
237 		NGIRCd_SignalQuit = FALSE;
238 
239 		/* Initialize modules, part I */
240 		Log_Init( );
241 		Conf_Init( );
242 
243 		if( Conf_Chroot[0] )
244 		{
245 			/* Chroot */
246 			if( chdir( Conf_Chroot ) != 0 ) Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
247 
248 			if( chroot( Conf_Chroot ) != 0 ) Log( LOG_ERR, "Can't change root directory to \"%s\": %s", Conf_Chroot, strerror( errno ));
249 			else Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
250 		}
251 
252 		if( Conf_GID != 0 )
253 		{
254 			/* Set new group ID */
255 			if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
256 		}
257 		if( Conf_UID != 0 )
258 		{
259 			/* Set new user ID */
260 			if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror( errno ));
261 		}
262 
263 		/* In der Regel wird ein Sub-Prozess ge-fork()'t, der
264 		 * nicht mehr mit dem Terminal verbunden ist. Mit der
265 		 * Option "--nodaemon" kann dies (z.B. zum Debuggen)
266 		 * verhindert werden. */
267 		if( ! NGIRCd_NoDaemon )
268 		{
269 			/* Daemon im Hintergrund erzeugen */
270 			pid = (LONG)fork( );
271 			if( pid > 0 )
272 			{
273 				/* "alter" Prozess */
274 				exit( 0 );
275 			}
276 			if( pid < 0 )
277 			{
278 				/* Fehler */
279 				printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE_NAME, strerror( errno ));
280 				exit( 1 );
281 			}
282 
283 			/* Child-Prozess initialisieren */
284 			(VOID)setsid( );
285 			chdir( "/" );
286 		}
287 
288 		/* Show user, group, and PID of the running daemon */
289 		pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
290 		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( ));
291 
292 		/* Change working directory to home directory of the user
293 		 * we are running as (when not running chroot()'ed!) */
294 		if( Conf_UID != 0 && ! Conf_Chroot[0] )
295 		{
296 			struct passwd *pwd;
297 
298 			pwd = getpwuid( Conf_UID );
299 			if( pwd != NULL )
300 			{
301 				if( chdir( pwd->pw_dir ) == 0 ) Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
302 				else Log( LOG_ERR, "Can't change working directory to \"%s\": %s", pwd->pw_dir, strerror( errno ));
303 			}
304 			else Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
305 		}
306 
307 		/* Initialize modules, part II: these functions are eventually
308 		 * called with already dropped privileges ... */
309 		Resolve_Init( );
310 		Lists_Init( );
311 		Channel_Init( );
312 		Client_Init( );
313 #ifdef RENDEZVOUS
314 		Rendezvous_Init( );
315 #endif
316 		Conn_Init( );
317 
318 		/* Redirect stderr handle to "error file" for debugging.
319 		 * But don't try to write in the chroot jail, since it's more 
320 		 * secure to have a chroot dir not writable by the daemon.
321 		 */
322 		if( ! Conf_Chroot[0] ) Log_InitErrorfile( );
323 
324 		/* Signal-Handler initialisieren */
325 		Initialize_Signal_Handler( );
326 
327 		/* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
328 		 * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
329 		 * sind in doc/Protocol.txt beschrieben. */
330 #ifdef IRCPLUS
331 		sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
332 #ifdef ZLIB
333 		strcat( NGIRCd_ProtoID, "Z" );
334 #endif
335 		if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
336 #else
337 		sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
338 #endif
339 		strcat( NGIRCd_ProtoID, " P" );
340 #ifdef ZLIB
341 		strcat( NGIRCd_ProtoID, "Z" );
342 #endif
343 		Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
344 
345 		/* Vordefinierte Channels anlegen */
346 		Channel_InitPredefined( );
347 
348 		/* Listen-Ports initialisieren */
349 		if( Conn_InitListeners( ) < 1 )
350 		{
351 			Log( LOG_ALERT, "Server isn't listening on a single port!" );
352 			Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
353 			exit( 1 );
354 		}
355 		
356 		/* Hauptschleife */
357 		Conn_Handler( );
358 
359 		/* Alles abmelden */
360 		Conn_Exit( );
361 #ifdef RENDEZVOUS
362 		Rendezvous_Exit( );
363 #endif
364 		Client_Exit( );
365 		Channel_Exit( );
366 		Lists_Exit( );
367 		Log_Exit( );
368 	}
369 
370 	return 0;
371 } /* main */
372 
373 
374 GLOBAL CHAR *
375 NGIRCd_Version( VOID )
376 {
377 	STATIC CHAR version[126];
378 	
379 #ifdef CVSDATE
380 	sprintf( version, "%s %s(%s)-%s", PACKAGE_NAME, PACKAGE_VERSION, CVSDATE, NGIRCd_VersionAddition( ));
381 #else
382 	sprintf( version, "%s %s-%s", PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition( ));
383 #endif
384 	return version;
385 } /* NGIRCd_Version */
386 
387 
388 GLOBAL CHAR *
389 NGIRCd_VersionAddition( VOID )
390 {
391 	STATIC CHAR txt[200];
392 
393 	strcpy( txt, "" );
394 
395 #ifdef SYSLOG
396 	if( txt[0] ) strcat( txt, "+" );
397 	strcat( txt, "SYSLOG" );
398 #endif
399 #ifdef ZLIB
400 	if( txt[0] ) strcat( txt, "+" );
401 	strcat( txt, "ZLIB" );
402 #endif
403 #ifdef TCPWRAP
404 	if( txt[0] ) strcat( txt, "+" );
405 	strcat( txt, "TCPWRAP" );
406 #endif
407 #ifdef RENDEZVOUS
408 	if( txt[0] ) strcat( txt, "+" );
409 	strcat( txt, "RENDEZVOUS" );
410 #endif
411 #ifdef IDENTAUTH
412 	if( txt[0] ) strcat( txt, "+" );
413 	strcat( txt, "IDENT" );
414 #endif
415 #ifdef DEBUG
416 	if( txt[0] ) strcat( txt, "+" );
417 	strcat( txt, "DEBUG" );
418 #endif
419 #ifdef SNIFFER
420 	if( txt[0] ) strcat( txt, "+" );
421 	strcat( txt, "SNIFFER" );
422 #endif
423 #ifdef STRICT_RFC
424 	if( txt[0] ) strcat( txt, "+" );
425 	strcat( txt, "RFC" );
426 #endif
427 #ifdef IRCPLUS
428 	if( txt[0] ) strcat( txt, "+" );
429 	strcat( txt, "IRCPLUS" );
430 #endif
431 	
432 	if( txt[0] ) strlcat( txt, "-", sizeof( txt ));
433 	strlcat( txt, TARGET_CPU, sizeof( txt ));
434 	strlcat( txt, "/", sizeof( txt ));
435 	strlcat( txt, TARGET_VENDOR, sizeof( txt ));
436 	strlcat( txt, "/", sizeof( txt ));
437 	strlcat( txt, TARGET_OS, sizeof( txt ));
438 
439 	return txt;
440 } /* NGIRCd_VersionAddition */
441 
442 
443 GLOBAL VOID
444 NGIRCd_Rehash( VOID )
445 {
446 	CHAR old_name[CLIENT_ID_LEN];
447 
448 	Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
449 	NGIRCd_SignalRehash = FALSE;
450 
451 	/* Close down all listening sockets */
452 	Conn_ExitListeners( );
453 
454 	/* Remember old server name */
455 	strcpy( old_name, Conf_ServerName );
456 
457 	/* Re-read configuration ... */
458 	Conf_Rehash( );
459 
460 	/* Recover old server name: it can't be changed during run-time */
461 	if( strcmp( old_name, Conf_ServerName ) != 0 )
462 	{
463 		strcpy( Conf_ServerName, old_name );
464 		Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
465 	}
466 
467 	/* Create new pre-defined channels */
468 	Channel_InitPredefined( );
469 	
470 	/* Start listening on sockets */
471 	Conn_InitListeners( );
472 
473 	/* Sync configuration with established connections */
474 	Conn_SyncServerStruct( );
475 
476 	Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
477 } /* NGIRCd_Rehash */
478 
479 
480 LOCAL VOID
481 Initialize_Signal_Handler( VOID )
482 {
483 	/* Signal-Handler initialisieren: einige Signale
484 	 * werden ignoriert, andere speziell behandelt. */
485 
486 #ifdef HAVE_SIGACTION
487 	/* sigaction() ist vorhanden */
488 
489 	struct sigaction saction;
490 
491 	/* Signal-Struktur initialisieren */
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 	/* Signal-Handler einhaengen */
502 	sigaction( SIGINT, &saction, NULL );
503 	sigaction( SIGQUIT, &saction, NULL );
504 	sigaction( SIGTERM, &saction, NULL);
505 	sigaction( SIGHUP, &saction, NULL);
506 	sigaction( SIGCHLD, &saction, NULL);
507 
508 	/* einige Signale ignorieren */
509 	saction.sa_handler = SIG_IGN;
510 	sigaction( SIGPIPE, &saction, NULL );
511 #else
512 	/* kein sigaction() vorhanden */
513 
514 	/* Signal-Handler einhaengen */
515 	signal( SIGINT, Signal_Handler );
516 	signal( SIGQUIT, Signal_Handler );
517 	signal( SIGTERM, Signal_Handler );
518 	signal( SIGHUP, Signal_Handler );
519 	signal( SIGCHLD, Signal_Handler );
520 
521 	/* einige Signale ignorieren */
522 	signal( SIGPIPE, SIG_IGN );
523 #endif
524 } /* Initialize_Signal_Handler */
525 
526 
527 LOCAL VOID
528 Signal_Handler( INT Signal )
529 {
530 	/* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
531 	 * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
532 	 * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
533 
534 	switch( Signal )
535 	{
536 		case SIGTERM:
537 		case SIGINT:
538 		case SIGQUIT:
539 			/* wir soll(t)en uns wohl beenden ... */
540 			NGIRCd_SignalQuit = TRUE;
541 			break;
542 		case SIGHUP:
543 			/* Konfiguration neu einlesen: */
544 			NGIRCd_SignalRehash = TRUE;
545 			break;
546 		case SIGCHLD:
547 			/* Child-Prozess wurde beendet. Zombies vermeiden: */
548 			while( waitpid( -1, NULL, WNOHANG ) > 0);
549 			break;
550 #ifdef DEBUG
551 		default:
552 			/* unbekanntes bzw. unbehandeltes Signal */
553 			Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
554 #endif
555 	}
556 } /* Signal_Handler */
557 
558 
559 LOCAL VOID
560 Show_Version( VOID )
561 {
562 	puts( NGIRCd_Version( ));
563 	puts( "Copyright (c)2001-2004 by Alexander Barton (<alex@barton.de>)." );
564 	puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
565 	puts( "This is free software; see the source for copying conditions. There is NO" );
566 	puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
567 } /* Show_Version */
568 
569 
570 LOCAL VOID
571 Show_Help( VOID )
572 {
573 #ifdef DEBUG
574 	puts( "  -d, --debug        log extra debug messages" );
575 #endif
576 	puts( "  -f, --config <f>   use file <f> as configuration file" );
577         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
578         puts( "  -p, --passive      disable automatic connections to other servers" );
579 #ifdef SNIFFER
580 	puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
581 #endif
582 	puts( "  -t, --configtest   read, validate and display configuration; then exit" );
583  	puts( "      --version      output version information and exit" );
584 	puts( "      --help         display this help and exit" );
585 } /* Show_Help */
586 
587 
588 /* -eof- */