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Date:: Mon Sep 16 09:20:27 2002 UTC
Message:: - neuer Befehl: ADMIN
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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: parse.c,v 1.41 2002/09/16 09:20:27 alex Exp $
13  *
14  * parse.c: Parsen der Client-Anfragen
15  */
16 
17 
18 #include "portab.h"
19 
20 #include "imp.h"
21 #include <assert.h>
22 #include <stdlib.h>
23 #include <stdio.h>
24 #include <string.h>
25 
26 #include "ngircd.h"
27 #include "defines.h"
28 #include "conn.h"
29 #include "client.h"
30 #include "channel.h"
31 #include "log.h"
32 #include "messages.h"
33 #include "tool.h"
34 
35 #include "exp.h"
36 #include "parse.h"
37 
38 #include "imp.h"
39 #include "irc.h"
40 #include "irc-channel.h"
41 #include "irc-login.h"
42 #include "irc-mode.h"
43 #include "irc-op.h"
44 #include "irc-oper.h"
45 #include "irc-server.h"
46 #include "irc-write.h"
47 
48 #include "exp.h"
49 
50 
51 LOCAL VOID Init_Request PARAMS(( REQUEST *Req ));
52 
53 LOCAL BOOLEAN Validate_Prefix PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ));
54 LOCAL BOOLEAN Validate_Command PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ));
55 LOCAL BOOLEAN Validate_Args PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ));
56 
57 LOCAL BOOLEAN Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req ));
58 
59 
60 GLOBAL BOOLEAN
61 Parse_Request( CONN_ID Idx, CHAR *Request )
62 {
63 	/* Client-Request parsen. Bei einem schwerwiegenden Fehler wird
64 	 * die Verbindung geschlossen und FALSE geliefert.
65 	 * Der Aufbau gueltiger Requests ist in RFC 2812, 2.3 definiert. */
66 
67 	REQUEST req;
68 	CHAR *start, *ptr;
69 	BOOLEAN closed;
70 
71 	assert( Idx >= 0 );
72 	assert( Request != NULL );
73 
74 #ifdef SNIFFER
75 	if( NGIRCd_Sniffer ) Log( LOG_DEBUG, " <- connection %d: '%s'.", Idx, Request );
76 #endif
77 
78 	Init_Request( &req );
79 
80 	/* Fuehrendes und folgendes "Geraffel" verwerfen */
81 	ngt_TrimStr( Request );
82 
83 	/* gibt es ein Prefix? */
84 	if( Request[0] == ':' )
85 	{
86 		/* Prefix vorhanden */
87 		req.prefix = Request + 1;
88 		ptr = strchr( Request, ' ' );
89 		if( ! ptr )
90 		{
91 			Log( LOG_DEBUG, "Connection %d: Parse error: prefix without command!?", Idx );
92 			return Conn_WriteStr( Idx, "ERROR :Prefix without command!?" );
93 		}
94 		*ptr = '\0';
95 #ifndef STRICT_RFC
96 		/* multiple Leerzeichen als Trenner zwischen
97 		 * Prefix und Befehl ignorieren */
98 		while( *(ptr + 1) == ' ' ) ptr++;
99 #endif
100 		start = ptr + 1;
101 	}
102 	else start = Request;
103 
104 	if( ! Validate_Prefix( Idx, &req, &closed )) return ! closed;
105 
106 	/* Befehl */
107 	ptr = strchr( start, ' ' );
108 	if( ptr )
109 	{
110 		*ptr = '\0';
111 #ifndef STRICT_RFC
112 		/* multiple Leerzeichen als Trenner vor
113 		*Parametertrennern ignorieren */
114 		while( *(ptr + 1) == ' ' ) ptr++;
115 #endif
116 	}
117 	req.command = start;
118 
119 	if( ! Validate_Command( Idx, &req, &closed )) return ! closed;
120 
121 	/* Argumente, Parameter */
122 	if( ptr )
123 	{
124 		/* Prinzipiell gibt es welche :-) */
125 		start = ptr + 1;
126 		while( start )
127 		{
128 			/* Parameter-String "zerlegen" */
129 			if( start[0] == ':' )
130 			{
131 				req.argv[req.argc] = start + 1;
132 				ptr = NULL;
133 			}
134 			else
135 			{
136 				req.argv[req.argc] = start;
137 				ptr = strchr( start, ' ' );
138 				if( ptr )
139 				{
140 					*ptr = '\0';
141 #ifndef STRICT_RFC
142 					/* multiple Leerzeichen als
143 					 * Parametertrenner ignorieren */
144 					while( *(ptr + 1) == ' ' ) ptr++;
145 #endif
146 				}
147 			}
148 
149 			req.argc++;
150 
151 			if( start[0] == ':' ) break;
152 			if( req.argc > 14 ) break;
153 
154 			if( ptr ) start = ptr + 1;
155 			else start = NULL;
156 		}
157 	}
158 
159 	if( ! Validate_Args( Idx, &req, &closed )) return ! closed;
160 
161 	return Handle_Request( Idx, &req );
162 } /* Parse_Request */
163 
164 
165 LOCAL VOID
166 Init_Request( REQUEST *Req )
167 {
168 	/* Neue Request-Struktur initialisieren */
169 
170 	INT i;
171 
172 	assert( Req != NULL );
173 
174 	Req->prefix = NULL;
175 	Req->command = NULL;
176 	for( i = 0; i < 15; Req->argv[i++] = NULL );
177 	Req->argc = 0;
178 } /* Init_Request */
179 
180 
181 LOCAL BOOLEAN
182 Validate_Prefix( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
183 {
184 	CLIENT *client, *c;
185 
186 	assert( Idx >= 0 );
187 	assert( Req != NULL );
188 
189 	*Closed = FALSE;
190 
191 	/* ist ueberhaupt ein Prefix vorhanden? */
192 	if( ! Req->prefix ) return TRUE;
193 
194 	/* Client-Struktur der Connection ermitteln */
195 	client = Client_GetFromConn( Idx );
196 	assert( client != NULL );
197 
198 	/* nur validieren, wenn bereits registrierte Verbindung */
199 	if(( Client_Type( client ) != CLIENT_USER ) && ( Client_Type( client ) != CLIENT_SERVER ) && ( Client_Type( client ) != CLIENT_SERVICE ))
200 	{
201 		/* noch nicht registrierte Verbindung.
202 		 * Das Prefix wird ignoriert. */
203 		Req->prefix = NULL;
204 		return TRUE;
205 	}
206 
207 	/* pruefen, ob der im Prefix angegebene Client bekannt ist */
208 	c = Client_Search( Req->prefix );
209 	if( ! c )
210 	{
211 		/* im Prefix angegebener Client ist nicht bekannt */
212 		Log( LOG_ERR, "Invalid prefix, client not known (connection %d)!?", Idx );
213 		if( ! Conn_WriteStr( Idx, "ERROR :Invalid prefix, client not known!?" )) *Closed = TRUE;
214 		return FALSE;
215 	}
216 
217 	/* pruefen, ob der Client mit dem angegebenen Prefix in Richtung
218 	 * des Senders liegt, d.h. sicherstellen, dass das Prefix nicht
219 	 * gefaelscht ist */
220 	if( Client_NextHop( c ) != client )
221 	{
222 		/* das angegebene Prefix ist aus dieser Richtung, also
223 		 * aus der gegebenen Connection, ungueltig! */
224 		Log( LOG_ERR, "Spoofed prefix \"%s\" from \"%s\" (connection %d)!", Req->prefix, Client_Mask( Client_GetFromConn( Idx )), Idx );
225 		Conn_Close( Idx, NULL, "Spoofed prefix", TRUE );
226 		*Closed = TRUE;
227 		return FALSE;
228 	}
229 
230 	return TRUE;
231 } /* Validate_Prefix */
232 
233 
234 LOCAL BOOLEAN
235 Validate_Command( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
236 {
237 	assert( Idx >= 0 );
238 	assert( Req != NULL );
239 	*Closed = FALSE;
240 
241 	return TRUE;
242 } /* Validate_Comman */
243 
244 
245 LOCAL BOOLEAN
246 Validate_Args( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
247 {
248 	assert( Idx >= 0 );
249 	assert( Req != NULL );
250 	*Closed = FALSE;
251 
252 	return TRUE;
253 } /* Validate_Args */
254 
255 
256 LOCAL BOOLEAN
257 Handle_Request( CONN_ID Idx, REQUEST *Req )
258 {
259 	/* Client-Request verarbeiten. Bei einem schwerwiegenden Fehler
260 	 * wird die Verbindung geschlossen und FALSE geliefert. */
261 
262 	CLIENT *client, *target, *prefix;
263 	CHAR str[LINE_LEN];
264 	INT i;
265 
266 	assert( Idx >= 0 );
267 	assert( Req != NULL );
268 	assert( Req->command != NULL );
269 
270 	client = Client_GetFromConn( Idx );
271 	assert( client != NULL );
272 
273 	/* Statuscode, der geforwarded werden muss? */
274 	if(( strlen( Req->command ) == 3 ) && ( atoi( Req->command ) > 100 ))
275 	{
276 		/* Befehl ist ein Statuscode */
277 
278 		/* Zielserver ermitteln */
279 		if(( Client_Type( client ) == CLIENT_SERVER ) && ( Req->argc > 0 )) target = Client_Search( Req->argv[0] );
280 		else target = NULL;
281 		if( ! target )
282 		{
283 			if( Req->argc > 0 ) Log( LOG_WARNING, "Unknown target for status code: \"%s\"", Req->argv[0] );
284 			else Log( LOG_WARNING, "Unknown target for status code!" );
285 			return TRUE;
286 		}
287 		if( target == Client_ThisServer( ))
288 		{
289 			Log( LOG_DEBUG, "Ignored status code %s from \"%s\".", Req->command, Client_ID( client ));
290 			return TRUE;
291 		}
292 
293 		/* Quell-Client ermitteln */
294 		if( ! Req->prefix[0] )
295 		{
296 			Log( LOG_WARNING, "Got status code without prefix!?" );
297 			return TRUE;
298 		}
299 		else prefix = Client_Search( Req->prefix );
300 		if( ! prefix )
301 		{
302 			Log( LOG_WARNING, "Got status code from unknown source: \"%s\"", Req->prefix );
303 			return TRUE;
304 		}
305 
306 		/* Statuscode weiterleiten */
307 		strcpy( str, Req->command );
308 		for( i = 0; i < Req->argc; i++ )
309 		{
310 			if( i < Req->argc - 1 ) strcat( str, " " );
311 			else strcat( str, " :" );
312 			strcat( str, Req->argv[i] );
313 		}
314 		return IRC_WriteStrClientPrefix( target, prefix, str );
315 	}
316 
317 	if( strcasecmp( Req->command, "PASS" ) == 0 ) return IRC_PASS( client, Req );
318 	else if( strcasecmp( Req->command, "NICK" ) == 0 ) return IRC_NICK( client, Req );
319 	else if( strcasecmp( Req->command, "USER" ) == 0 ) return IRC_USER( client, Req );
320 	else if( strcasecmp( Req->command, "SERVER" ) == 0 ) return IRC_SERVER( client, Req );
321 	else if( strcasecmp( Req->command, "NJOIN" ) == 0 ) return IRC_NJOIN( client, Req );
322 	else if( strcasecmp( Req->command, "QUIT" ) == 0 ) return IRC_QUIT( client, Req );
323 	else if( strcasecmp( Req->command, "SQUIT" ) == 0 ) return IRC_SQUIT( client, Req );
324 	else if( strcasecmp( Req->command, "PING" ) == 0 ) return IRC_PING( client, Req );
325 	else if( strcasecmp( Req->command, "PONG" ) == 0 ) return IRC_PONG( client, Req );
326 	else if( strcasecmp( Req->command, "MOTD" ) == 0 ) return IRC_MOTD( client, Req );
327 	else if( strcasecmp( Req->command, "PRIVMSG" ) == 0 ) return IRC_PRIVMSG( client, Req );
328 	else if( strcasecmp( Req->command, "NOTICE" ) == 0 ) return IRC_NOTICE( client, Req );
329 	else if( strcasecmp( Req->command, "MODE" ) == 0 ) return IRC_MODE( client, Req );
330 	else if( strcasecmp( Req->command, "NAMES" ) == 0 ) return IRC_NAMES( client, Req );
331 	else if( strcasecmp( Req->command, "ISON" ) == 0 ) return IRC_ISON( client, Req );
332 	else if( strcasecmp( Req->command, "WHOIS" ) == 0 ) return IRC_WHOIS( client, Req );
333 	else if( strcasecmp( Req->command, "USERHOST" ) == 0 ) return IRC_USERHOST( client, Req );
334 	else if( strcasecmp( Req->command, "OPER" ) == 0 ) return IRC_OPER( client, Req );
335 	else if( strcasecmp( Req->command, "DIE" ) == 0 ) return IRC_DIE( client, Req );
336 	else if( strcasecmp( Req->command, "RESTART" ) == 0 ) return IRC_RESTART( client, Req );
337 	else if( strcasecmp( Req->command, "ERROR" ) == 0 ) return IRC_ERROR( client, Req );
338 	else if( strcasecmp( Req->command, "LUSERS" ) == 0 ) return IRC_LUSERS( client, Req );
339 	else if( strcasecmp( Req->command, "LINKS" ) == 0 ) return IRC_LINKS( client, Req );
340 	else if( strcasecmp( Req->command, "JOIN" ) == 0 ) return IRC_JOIN( client, Req );
341 	else if( strcasecmp( Req->command, "PART" ) == 0 ) return IRC_PART( client, Req );
342 	else if( strcasecmp( Req->command, "VERSION" ) == 0 ) return IRC_VERSION( client, Req );
343 	else if( strcasecmp( Req->command, "KILL" ) == 0 ) return IRC_KILL( client, Req );
344 	else if( strcasecmp( Req->command, "AWAY" ) == 0 ) return IRC_AWAY( client, Req );
345 	else if( strcasecmp( Req->command, "TOPIC" ) == 0 ) return IRC_TOPIC( client, Req );
346 	else if( strcasecmp( Req->command, "WHO" ) == 0 ) return IRC_WHO( client, Req );
347 	else if( strcasecmp( Req->command, "LIST" ) == 0 ) return IRC_LIST( client, Req );
348 	else if( strcasecmp( Req->command, "INVITE" ) == 0 ) return IRC_INVITE( client, Req );
349 	else if( strcasecmp( Req->command, "KICK" ) == 0 ) return IRC_KICK( client, Req );
350 	else if( strcasecmp( Req->command, "CONNECT" ) == 0 ) return IRC_CONNECT( client, Req );
351 	else if( strcasecmp( Req->command, "ADMIN" ) == 0 ) return IRC_ADMIN( client, Req );
352 #ifdef IRCPLUS
353 	else if( strcasecmp( Req->command, "CHANINFO" ) == 0 ) return IRC_CHANINFO( client, Req );
354 #endif
355 	
356 	/* Unbekannter Befehl */
357 	if( Client_Type( client ) != CLIENT_SERVER ) IRC_WriteStrClient( client, ERR_UNKNOWNCOMMAND_MSG, Client_ID( client ), Req->command );
358 	Log( LOG_DEBUG, "Connection %d: Unknown command \"%s\", %d %s,%s prefix.", Client_Conn( client ), Req->command, Req->argc, Req->argc == 1 ? "parameter" : "parameters", Req->prefix ? "" : " no" );
359 
360 	return TRUE;
361 } /* Handle_Request */
362 
363 
364 /* -eof- */