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 1.35 2002/03/25 19:11:01 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 <signal.h>
25 #include <string.h>
26 #include <unistd.h>
27 #include <sys/types.h>
28 #include <sys/wait.h>
29 #include <time.h>
30 
31 #include "channel.h"
32 #include "client.h"
33 #include "conf.h"
34 #include "conn.h"
35 #include "defines.h"
36 #include "irc.h"
37 #include "log.h"
38 #include "parse.h"
39 
40 #include "exp.h"
41 #include "ngircd.h"
42 
43 
44 LOCAL VOID Initialize_Signal_Handler( VOID );
45 LOCAL VOID Signal_Handler( INT Signal );
46 
47 LOCAL VOID Initialize_Listen_Ports( VOID );
48 
49 LOCAL VOID Show_Version( VOID );
50 LOCAL VOID Show_Help( VOID );
51 
52 
53 GLOBAL int main( int argc, const char *argv[] )
54 {
55 	BOOLEAN ok;
56 	INT32 pid, n;
57 	INT i;
58 
59 	NGIRCd_Restart = FALSE;
60 	NGIRCd_Quit = FALSE;
61 	NGIRCd_NoDaemon = FALSE;
62 	NGIRCd_Passive = FALSE;
63 #ifdef DEBUG
64 	NGIRCd_Debug = FALSE;
65 #endif
66 #ifdef SNIFFER
67 	NGIRCd_Sniffer = FALSE;
68 #endif
69 
70 	/* Kommandozeile parsen */
71 	for( i = 1; i < argc; i++ )
72 	{
73 		ok = FALSE;
74 		if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
75 		{
76 			/* Lange Option */
77 
78 #ifdef DEBUG
79 			if( strcmp( argv[i], "--debug" ) == 0 )
80 			{
81 				NGIRCd_Debug = TRUE;
82 				ok = TRUE;
83 			}
84 #endif
85 			if( strcmp( argv[i], "--help" ) == 0 )
86 			{
87 				Show_Version( ); puts( "" );
88 				Show_Help( ); puts( "" );
89 				exit( 1 );
90 			}
91 			if( strcmp( argv[i], "--nodaemon" ) == 0 )
92 			{
93 				NGIRCd_NoDaemon = TRUE;
94 				ok = TRUE;
95 			}
96 			if( strcmp( argv[i], "--passive" ) == 0 )
97 			{
98 				NGIRCd_Passive = TRUE;
99 				ok = TRUE;
100 			}
101 #ifdef SNIFFER
102 			if( strcmp( argv[i], "--sniffer" ) == 0 )
103 			{
104 				NGIRCd_Sniffer = TRUE;
105 				ok = TRUE;
106 			}
107 #endif
108 			if( strcmp( argv[i], "--version" ) == 0 )
109 			{
110 				Show_Version( );
111 				exit( 1 );
112 			}
113 		}
114 		else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
115 		{
116 			/* Kurze Option */
117 			
118 			for( n = 1; n < (INT32)strlen( argv[i] ); n++ )
119 			{
120 				ok = FALSE;
121 #ifdef DEBUG
122 				if( argv[i][n] == 'd' )
123 				{
124 					NGIRCd_Debug = TRUE;
125 					ok = TRUE;
126 				}
127 #endif
128 				if( argv[i][n] == 'n' )
129 				{
130 					NGIRCd_NoDaemon = TRUE;
131 					ok = TRUE;
132 				}
133 				if( argv[i][n] == 'p' )
134 				{
135 					NGIRCd_Passive = TRUE;
136 					ok = TRUE;
137 				}
138 #ifdef SNIFFER
139 				if( argv[i][n] == 's' )
140 				{
141 					NGIRCd_Sniffer = TRUE;
142 					ok = TRUE;
143 				}
144 #endif
145 
146 				if( ! ok )
147 				{
148 					printf( PACKAGE": invalid option \"-%c\"!\n", argv[i][n] );
149 					puts( "Try \""PACKAGE" --help\" for more information." );
150 					exit( 1 );
151 				}
152 			}
153 
154 		}
155 		if( ! ok )
156 		{
157 			printf( PACKAGE": invalid option \"%s\"!\n", argv[i] );
158 			puts( "Try \""PACKAGE" --help\" for more information." );
159 			exit( 1 );
160 		}
161 	}
162 
163 	/* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
164 	strcpy( NGIRCd_DebugLevel, "" );
165 #ifdef DEBUG
166 	if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
167 #endif
168 #ifdef SNIFFER
169 	if( NGIRCd_Sniffer ) strcpy( NGIRCd_DebugLevel, "2" );
170 #endif
171 	
172 	while( ! NGIRCd_Quit )
173 	{
174 		/* In der Regel wird ein Sub-Prozess ge-fork()'t, der
175 		 * nicht mehr mit dem Terminal verbunden ist. Mit der
176 		 * Option "--nodaemon" kann dies (z.B. zum Debuggen)
177 		 * verhindert werden. */
178 		if( ! NGIRCd_NoDaemon )
179 		{
180 			/* Daemon im Hintergrund erzeugen */
181 			pid = (INT32)fork( );
182 			if( pid > 0 )
183 			{
184 				/* "alter" Prozess */
185 				exit( 0 );
186 			}
187 			if( pid < 0 )
188 			{
189 				/* Fehler */
190 				printf( PACKAGE": Can't fork: %s!\nFatal error, exiting now ...", strerror( errno ));
191 				exit( 1 );
192 			}
193 
194 			/* Child-Prozess initialisieren */
195 			(VOID)setsid( );
196 			chdir( "/" );
197 		}
198 	
199 		/* Globale Variablen initialisieren */
200 		NGIRCd_Start = time( NULL );
201 		(VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
202 		NGIRCd_Restart = FALSE;
203 		NGIRCd_Quit = FALSE;
204 
205 		/* Module initialisieren */
206 		Log_Init( );
207 		Conf_Init( );
208 		Channel_Init( );
209 		Client_Init( );
210 		Conn_Init( );
211 
212 		/* Signal-Handler initialisieren */
213 		Initialize_Signal_Handler( );
214 
215 		/* Listen-Ports initialisieren */
216 		Initialize_Listen_Ports( );
217 
218 		/* Hauptschleife */
219 		while( TRUE )
220 		{
221 			if( NGIRCd_Quit || NGIRCd_Restart ) break;
222 			Conn_Handler( 5 );
223 		}
224 
225 		/* Alles abmelden */
226 		Conn_Exit( );
227 		Client_Exit( );
228 		Channel_Exit( );
229 		Conf_Exit( );
230 		Log_Exit( );
231 	}
232 
233 #ifndef DEBUG
234 	/* aufraeumen */
235 	if( unlink( ERROR_FILE ) != 0 ) Log( LOG_ERR, "Can't delete \""ERROR_FILE"\": %s", strerror( errno ));
236 #endif
237 
238 	return 0;
239 } /* main */
240 
241 
242 GLOBAL CHAR *NGIRCd_Version( VOID )
243 {
244 	STATIC CHAR version[126];
245 
246 	sprintf( version, PACKAGE" version "VERSION"-%s", NGIRCd_VersionAddition( ));
247 	return version;
248 } /* NGIRCd_Version */
249 
250 
251 GLOBAL CHAR *NGIRCd_VersionAddition( VOID )
252 {
253 	STATIC CHAR txt[64];
254 
255 	strcpy( txt, "" );
256 
257 #ifdef USE_SYSLOG
258 	if( txt[0] ) strcat( txt, "+" );
259 	strcat( txt, "SYSLOG" );
260 #endif
261 #ifdef STRICT_RFC
262 	if( txt[0] ) strcat( txt, "+" );
263 	strcat( txt, "RFC" );
264 #endif
265 #ifdef DEBUG
266 	if( txt[0] ) strcat( txt, "+" );
267 	strcat( txt, "DEBUG" );
268 #endif
269 #ifdef SNIFFER
270 	if( txt[0] ) strcat( txt, "+" );
271 	strcat( txt, "SNIFFER" );
272 #endif
273 
274 	if( txt[0] ) strcat( txt, "-" );
275 	strcat( txt, TARGET_CPU"/"TARGET_VENDOR"/"TARGET_OS );
276 
277 	return txt;
278 } /* NGIRCd_VersionAddition */
279 
280 
281 LOCAL VOID Initialize_Signal_Handler( VOID )
282 {
283 	/* Signal-Handler initialisieren: einige Signale
284 	 * werden ignoriert, andere speziell behandelt. */
285 
286 #ifdef HAVE_SIGACTION
287 	/* sigaction() ist vorhanden */
288 
289 	struct sigaction saction;
290 
291 	/* Signal-Struktur initialisieren */
292 	memset( &saction, 0, sizeof( saction ));
293 	saction.sa_handler = Signal_Handler;
294 #ifdef SA_RESTART
295 	saction.sa_flags |= SA_RESTART;
296 #endif
297 #ifdef SA_NOCLDWAIT
298 	saction.sa_flags |= SA_NOCLDWAIT;
299 #endif
300 
301 	/* Signal-Handler einhaengen */
302 	sigaction( SIGINT, &saction, NULL );
303 	sigaction( SIGQUIT, &saction, NULL );
304 	sigaction( SIGTERM, &saction, NULL);
305 	sigaction( SIGHUP, &saction, NULL);
306 	sigaction( SIGCHLD, &saction, NULL);
307 
308 	/* einige Signale ignorieren */
309 	saction.sa_handler = SIG_IGN;
310 	sigaction( SIGPIPE, &saction, NULL );
311 #else
312 	/* kein sigaction() vorhanden */
313 
314 	/* Signal-Handler einhaengen */
315 	signal( SIGINT, Signal_Handler );
316 	signal( SIGQUIT, Signal_Handler );
317 	signal( SIGTERM, Signal_Handler );
318 	signal( SIGHUP, Signal_Handler );
319 	signal( SIGCHLD, Signal_Handler );
320 
321 	/* einige Signale ignorieren */
322 	signal( SIGPIPE, SIG_IGN );
323 #endif
324 } /* Initialize_Signal_Handler */
325 
326 
327 LOCAL VOID Signal_Handler( INT Signal )
328 {
329 	/* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
330 	 * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
331 	 * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
332 
333 	switch( Signal )
334 	{
335 		case SIGTERM:
336 		case SIGINT:
337 		case SIGQUIT:
338 			/* wir soll(t)en uns wohl beenden ... */
339 			if( Signal == SIGTERM ) Log( LOG_WARNING, "Got TERM signal, terminating now ..." );
340 			else if( Signal == SIGINT ) Log( LOG_WARNING, "Got INT signal, terminating now ..." );
341 			else if( Signal == SIGQUIT ) Log( LOG_WARNING, "Got QUIT signal, terminating now ..." );
342 			NGIRCd_Quit = TRUE;
343 			break;
344 		case SIGHUP:
345 			/* neu starten */
346 			Log( LOG_WARNING, "Got HUP signal, restarting now ..." );
347 			NGIRCd_Restart = TRUE;
348 			break;
349 		case SIGCHLD:
350 			/* Child-Prozess wurde beendet. Zombies vermeiden: */
351 			while( waitpid( -1, NULL, WNOHANG ) > 0);
352 			break;
353 		default:
354 			/* unbekanntes bzw. unbehandeltes Signal */
355 			Log( LOG_NOTICE, "Got signal %d! Ignored.", Signal );
356 	}
357 } /* Signal_Handler */
358 
359 
360 LOCAL VOID Initialize_Listen_Ports( VOID )
361 {
362 	/* Ports, auf denen der Server Verbindungen entgegennehmen
363 	 * soll, initialisieren */
364 	
365 	INT created, i;
366 
367 	created = 0;
368 	for( i = 0; i < Conf_ListenPorts_Count; i++ )
369 	{
370 		if( Conn_NewListener( Conf_ListenPorts[i] )) created++;
371 		else Log( LOG_ERR, "Can't listen on port %d!", Conf_ListenPorts[i] );
372 	}
373 
374 	if( created < 1 )
375 	{
376 		Log( LOG_ALERT, "Server isn't listening on a single port!" );
377 		Log( LOG_ALERT, PACKAGE" exiting due to fatal errors!" );
378 		exit( 1 );
379 	}
380 } /* Initialize_Listen_Ports */
381 
382 
383 LOCAL VOID Show_Version( VOID )
384 {
385 	puts( NGIRCd_Version( ));
386 	puts( "Copyright (c)2001,2002 by Alexander Barton (alex@barton.de).\n" );
387 	puts( "This is free software; see the source for copying conditions. There is NO" );
388 	puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
389 } /* Show_Version */
390 
391 
392 LOCAL VOID Show_Help( VOID )
393 {
394 	puts( "Compile-time defaults:\n" );
395 	puts( "  - configuration: "CONFIG_FILE );
396 	puts( "  - MOTD file: "MOTD_FILE );
397 	puts( "  - server error log: "ERROR_FILE"\n" );
398 	puts( "Run-time options:\n" );
399 #ifdef DEBUG
400 	puts( "  -d, --debug       log extra debug messages" );
401 #endif
402         puts( "  -n, --nodaemon    don't fork and don't detatch from controlling terminal" );
403         puts( "  -p, --passive     disable automatic connections to other servers" );
404 #ifdef SNIFFER
405 	puts( "  -s, --sniffer     enable network sniffer and display all IRC traffic" );
406 #endif
407  	puts( "      --version     output version information and exit" );
408 	puts( "      --help        display this help and exit" );
409 } /* Show_Help */
410 
411 
412 /* -eof- */