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 1.31 2002/03/25 17:13:46 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 "client.h"
28 #include "conn.h"
29 #include "defines.h"
30 #include "irc.h"
31 #include "irc-channel.h"
32 #include "irc-login.h"
33 #include "irc-mode.h"
34 #include "irc-oper.h"
35 #include "irc-server.h"
36 #include "irc-write.h"
37 #include "log.h"
38 #include "messages.h"
39 #include "tool.h"
40 
41 #include "exp.h"
42 #include "parse.h"
43 
44 
45 LOCAL VOID Init_Request( REQUEST *Req );
46 
47 LOCAL BOOLEAN Parse_Error( CONN_ID Idx, CHAR *Error );
48 
49 LOCAL BOOLEAN Validate_Prefix( REQUEST *Req );
50 LOCAL BOOLEAN Validate_Command( REQUEST *Req );
51 LOCAL BOOLEAN Validate_Args( REQUEST *Req );
52 
53 LOCAL BOOLEAN Handle_Request( CONN_ID Idx, REQUEST *Req );
54 
55 
56 GLOBAL BOOLEAN Parse_Request( CONN_ID Idx, CHAR *Request )
57 {
58 	/* Client-Request parsen. Bei einem schwerwiegenden Fehler wird
59 	 * die Verbindung geschlossen und FALSE geliefert.
60 	 * Der Aufbau gueltiger Requests ist in RFC 2812, 2.3 definiert. */
61 
62 	REQUEST req;
63 	CHAR *start, *ptr;
64 
65 	assert( Idx >= 0 );
66 	assert( Request != NULL );
67 
68 #ifdef SNIFFER
69 	if( NGIRCd_Sniffer ) Log( LOG_DEBUG, " <- connection %d: '%s'.", Idx, Request );
70 #endif
71 	
72 	Init_Request( &req );
73 
74 	/* Fuehrendes und folgendes "Geraffel" verwerfen */
75 	ngt_TrimStr( Request );
76 
77 	/* gibt es ein Prefix? */
78 	if( Request[0] == ':' )
79 	{
80 		/* Prefix vorhanden */
81 		req.prefix = Request + 1;
82 		ptr = strchr( Request, ' ' );
83 		if( ! ptr ) return Parse_Error( Idx, "Prefix without command!?" );
84 		*ptr = '\0';
85 #ifndef STRICT_RFC
86 		/* multiple Leerzeichen als Trenner zwischen
87 		 * Prefix und Befehl ignorieren */
88 		while( *(ptr + 1) == ' ' ) ptr++;
89 #endif
90 		start = ptr + 1;
91 	}
92 	else start = Request;
93 
94 	if( ! Validate_Prefix( &req )) return Parse_Error( Idx, "Invalid prefix");
95 
96 	/* Befehl */
97 	ptr = strchr( start, ' ' );
98 	if( ptr )
99 	{
100 		*ptr = '\0';
101 #ifndef STRICT_RFC
102 		/* multiple Leerzeichen als Trenner vor
103 		*Parametertrennern ignorieren */
104 		while( *(ptr + 1) == ' ' ) ptr++;
105 #endif
106 	}
107 	req.command = start;
108 
109 	if( ! Validate_Command( &req )) return Parse_Error( Idx, "Invalid command" );
110 
111 	/* Argumente, Parameter */
112 	if( ptr )
113 	{
114 		/* Prinzipiell gibt es welche :-) */
115 		start = ptr + 1;
116 		while( start )
117 		{
118 			/* Parameter-String "zerlegen" */
119 			if( start[0] == ':' )
120 			{
121 				req.argv[req.argc] = start + 1;
122 				ptr = NULL;
123 			}
124 			else
125 			{
126 				req.argv[req.argc] = start;
127 				ptr = strchr( start, ' ' );
128 				if( ptr )
129 				{
130 					*ptr = '\0';
131 #ifndef STRICT_RFC
132 					/* multiple Leerzeichen als
133 					 * Parametertrenner ignorieren */
134 					while( *(ptr + 1) == ' ' ) ptr++;
135 #endif
136 				}
137 			}
138 			
139 			req.argc++;
140 
141 			if( start[0] == ':' ) break;
142 			if( req.argc > 14 ) break;
143 			
144 			if( ptr ) start = ptr + 1;
145 			else start = NULL;
146 		}
147 	}
148 	
149 	if( ! Validate_Args( &req )) return Parse_Error( Idx, "Invalid argument(s)" );
150 
151 	return Handle_Request( Idx, &req );
152 } /* Parse_Request */
153 
154 
155 LOCAL VOID Init_Request( REQUEST *Req )
156 {
157 	/* Neue Request-Struktur initialisieren */
158 
159 	INT i;
160 	
161 	assert( Req != NULL );
162 
163 	Req->prefix = NULL;
164 	Req->command = NULL;
165 	for( i = 0; i < 15; Req->argv[i++] = NULL );
166 	Req->argc = 0;
167 } /* Init_Request */
168 
169 
170 LOCAL BOOLEAN Parse_Error( CONN_ID Idx, CHAR *Error )
171 {
172 	/* Fehler beim Parsen. Fehlermeldung an den Client schicken.
173 	 * TRUE: Connection wurde durch diese Funktion nicht geschlossen,
174 	 * FALSE: Connection wurde terminiert. */
175 	
176 	assert( Idx >= 0 );
177 	assert( Error != NULL );
178 
179 	Log( LOG_DEBUG, "Connection %d: Parse error: %s", Idx, Error );
180 	return Conn_WriteStr( Idx, "ERROR :Parse error: %s", Error );
181 } /* Parse_Error */
182 
183 
184 LOCAL BOOLEAN Validate_Prefix( REQUEST *Req )
185 {
186 	assert( Req != NULL );
187 	return TRUE;
188 } /* Validate_Prefix */
189 
190 
191 LOCAL BOOLEAN Validate_Command( REQUEST *Req )
192 {
193 	assert( Req != NULL );
194 	return TRUE;
195 } /* Validate_Comman */
196 
197 
198 LOCAL BOOLEAN Validate_Args( REQUEST *Req )
199 {
200 	assert( Req != NULL );
201 	return TRUE;
202 } /* Validate_Args */
203 
204 
205 LOCAL BOOLEAN Handle_Request( CONN_ID Idx, REQUEST *Req )
206 {
207 	/* Client-Request verarbeiten. Bei einem schwerwiegenden Fehler
208 	 * wird die Verbindung geschlossen und FALSE geliefert. */
209 
210 	CLIENT *client, *target, *prefix;
211 	CHAR str[LINE_LEN];
212 	INT i;
213 
214 	assert( Idx >= 0 );
215 	assert( Req != NULL );
216 	assert( Req->command != NULL );
217 
218 	client = Client_GetFromConn( Idx );
219 	assert( client != NULL );
220 
221 	/* Statuscode, der geforwarded werden muss? */
222 	if(( strlen( Req->command ) == 3 ) && ( atoi( Req->command ) > 100 ))
223 	{
224 		/* Befehl ist ein Statuscode */
225 
226 		/* Zielserver ermitteln */
227 		if(( Client_Type( client ) == CLIENT_SERVER ) && ( Req->argc > 0 )) target = Client_Search( Req->argv[0] );
228 		else target = NULL;
229 		if( ! target )
230 		{
231 			if( Req->argc > 0 ) Log( LOG_WARNING, "Unknown target for status code: \"%s\"", Req->argv[0] );
232 			else Log( LOG_WARNING, "Unknown target for status code!" );
233 			return TRUE;
234 		}
235 		if( target == Client_ThisServer( ))
236 		{
237 			Log( LOG_DEBUG, "Ignored status code %s from \"%s\".", Req->command, Client_ID( client ));
238 			return TRUE;
239 		}
240 
241 		/* Quell-Client ermitteln */
242 		if( ! Req->prefix[0] )
243 		{
244 			Log( LOG_WARNING, "Got status code without prefix!?" );
245 			return TRUE;
246 		}
247 		else prefix = Client_Search( Req->prefix );
248 		if( ! prefix )
249 		{
250 			Log( LOG_WARNING, "Got status code from unknown source: \"%s\"", Req->prefix );
251 			return TRUE;
252 		}
253 
254 		/* Statuscode weiterleiten */
255 		strcpy( str, Req->command );
256 		for( i = 0; i < Req->argc; i++ )
257 		{
258 			if( i < Req->argc - 1 ) strcat( str, " " );
259 			else strcat( str, " :" );
260 			strcat( str, Req->argv[i] );
261 		}
262 		return IRC_WriteStrClientPrefix( target, prefix, str );
263 	}
264 
265 	if( strcasecmp( Req->command, "PASS" ) == 0 ) return IRC_PASS( client, Req );
266 	else if( strcasecmp( Req->command, "NICK" ) == 0 ) return IRC_NICK( client, Req );
267 	else if( strcasecmp( Req->command, "USER" ) == 0 ) return IRC_USER( client, Req );
268 	else if( strcasecmp( Req->command, "SERVER" ) == 0 ) return IRC_SERVER( client, Req );
269 	else if( strcasecmp( Req->command, "NJOIN" ) == 0 ) return IRC_NJOIN( client, Req );
270 	else if( strcasecmp( Req->command, "QUIT" ) == 0 ) return IRC_QUIT( client, Req );
271 	else if( strcasecmp( Req->command, "SQUIT" ) == 0 ) return IRC_SQUIT( client, Req );
272 	else if( strcasecmp( Req->command, "PING" ) == 0 ) return IRC_PING( client, Req );
273 	else if( strcasecmp( Req->command, "PONG" ) == 0 ) return IRC_PONG( client, Req );
274 	else if( strcasecmp( Req->command, "MOTD" ) == 0 ) return IRC_MOTD( client, Req );
275 	else if( strcasecmp( Req->command, "PRIVMSG" ) == 0 ) return IRC_PRIVMSG( client, Req );
276 	else if( strcasecmp( Req->command, "NOTICE" ) == 0 ) return IRC_NOTICE( client, Req );
277 	else if( strcasecmp( Req->command, "MODE" ) == 0 ) return IRC_MODE( client, Req );
278 	else if( strcasecmp( Req->command, "NAMES" ) == 0 ) return IRC_NAMES( client, Req );
279 	else if( strcasecmp( Req->command, "ISON" ) == 0 ) return IRC_ISON( client, Req );
280 	else if( strcasecmp( Req->command, "WHOIS" ) == 0 ) return IRC_WHOIS( client, Req );
281 	else if( strcasecmp( Req->command, "USERHOST" ) == 0 ) return IRC_USERHOST( client, Req );
282 	else if( strcasecmp( Req->command, "OPER" ) == 0 ) return IRC_OPER( client, Req );
283 	else if( strcasecmp( Req->command, "DIE" ) == 0 ) return IRC_DIE( client, Req );
284 	else if( strcasecmp( Req->command, "RESTART" ) == 0 ) return IRC_RESTART( client, Req );
285 	else if( strcasecmp( Req->command, "ERROR" ) == 0 ) return IRC_ERROR( client, Req );
286 	else if( strcasecmp( Req->command, "LUSERS" ) == 0 ) return IRC_LUSERS( client, Req );
287 	else if( strcasecmp( Req->command, "LINKS" ) == 0 ) return IRC_LINKS( client, Req );
288 	else if( strcasecmp( Req->command, "JOIN" ) == 0 ) return IRC_JOIN( client, Req );
289 	else if( strcasecmp( Req->command, "PART" ) == 0 ) return IRC_PART( client, Req );
290 	else if( strcasecmp( Req->command, "VERSION" ) == 0 ) return IRC_VERSION( client, Req );
291 	else if( strcasecmp( Req->command, "KILL" ) == 0 ) return IRC_KILL( client, Req );
292 	else if( strcasecmp( Req->command, "AWAY" ) == 0 ) return IRC_AWAY( client, Req );
293 	else if( strcasecmp( Req->command, "TOPIC" ) == 0 ) return IRC_TOPIC( client, Req );
294 	else if( strcasecmp( Req->command, "WHO" ) == 0 ) return IRC_WHO( client, Req );
295 	
296 	/* Unbekannter Befehl */
297 	if( Client_Type( client ) != CLIENT_SERVER ) IRC_WriteStrClient( client, ERR_UNKNOWNCOMMAND_MSG, Client_ID( client ), Req->command );
298 	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" );
299 
300 	return TRUE;
301 } /* Handle_Request */
302 
303 
304 /* -eof- */