2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
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.
11 * IRC command parser and validator
17 static char UNUSED id[] = "$Id: parse.c,v 1.55 2002/12/30 17:15:42 alex Exp $";
27 #include "conn-func.h"
39 #include "irc-channel.h"
41 #include "irc-login.h"
45 #include "irc-server.h"
46 #include "irc-write.h"
51 COMMAND My_Commands[] =
53 { "ADMIN", IRC_ADMIN, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
54 { "AWAY", IRC_AWAY, CLIENT_USER, 0, 0, 0 },
55 { "CONNECT", IRC_CONNECT, CLIENT_USER, 0, 0, 0 },
56 { "DIE", IRC_DIE, CLIENT_USER, 0, 0, 0 },
57 { "ERROR", IRC_ERROR, 0xFFFF, 0, 0, 0 },
58 { "INVITE", IRC_INVITE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
59 { "ISON", IRC_ISON, CLIENT_USER, 0, 0, 0 },
60 { "JOIN", IRC_JOIN, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
61 { "KICK", IRC_KICK, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
62 { "KILL", IRC_KILL, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
63 { "LINKS", IRC_LINKS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
64 { "LIST", IRC_LIST, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
65 { "LUSERS", IRC_LUSERS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
66 { "MODE", IRC_MODE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
67 { "MOTD", IRC_MOTD, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
68 { "NAMES", IRC_NAMES, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
69 { "NICK", IRC_NICK, 0xFFFF, 0, 0, 0 },
70 { "NJOIN", IRC_NJOIN, CLIENT_SERVER, 0, 0, 0 },
71 { "NOTICE", IRC_NOTICE, 0xFFFF, 0, 0, 0 },
72 { "OPER", IRC_OPER, CLIENT_USER, 0, 0, 0 },
73 { "PART", IRC_PART, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
74 { "PASS", IRC_PASS, 0xFFFF, 0, 0, 0 },
75 { "PING", IRC_PING, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
76 { "PONG", IRC_PONG, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
77 { "PRIVMSG", IRC_PRIVMSG, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
78 { "QUIT", IRC_QUIT, 0xFFFF, 0, 0, 0 },
79 { "REHASH", IRC_REHASH, CLIENT_USER, 0, 0, 0 },
80 { "RESTART", IRC_RESTART, CLIENT_USER, 0, 0, 0 },
81 { "SERVER", IRC_SERVER, 0xFFFF, 0, 0, 0 },
82 { "SQUIT", IRC_SQUIT, CLIENT_SERVER, 0, 0, 0 },
83 { "STATS", IRC_STATS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
84 { "TIME", IRC_TIME, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
85 { "TOPIC", IRC_TOPIC, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
86 { "USER", IRC_USER, 0xFFFF, 0, 0, 0 },
87 { "USERHOST", IRC_USERHOST, CLIENT_USER, 0, 0, 0 },
88 { "VERSION", IRC_VERSION, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
89 { "WHO", IRC_WHO, CLIENT_USER, 0, 0, 0 },
90 { "WHOIS", IRC_WHOIS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
91 { "WHOWAS", IRC_WHOWAS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
93 { "CHANINFO", IRC_CHANINFO, CLIENT_SERVER, 0, 0, 0 },
95 { NULL, NULL, 0x0, 0, 0, 0 } /* Ende-Marke */
99 LOCAL VOID Init_Request PARAMS(( REQUEST *Req ));
101 LOCAL BOOLEAN Validate_Prefix PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ));
102 LOCAL BOOLEAN Validate_Command PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ));
103 LOCAL BOOLEAN Validate_Args PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ));
105 LOCAL BOOLEAN Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req ));
109 Parse_GetCommandStruct( VOID )
112 } /* Parse_GetCommandStruct */
116 Parse_Request( CONN_ID Idx, CHAR *Request )
118 /* Client-Request parsen. Bei einem schwerwiegenden Fehler wird
119 * die Verbindung geschlossen und FALSE geliefert.
120 * Der Aufbau gueltiger Requests ist in RFC 2812, 2.3 definiert. */
127 assert( Request != NULL );
130 if( NGIRCd_Sniffer ) Log( LOG_DEBUG, " <- connection %d: '%s'.", Idx, Request );
133 Init_Request( &req );
135 /* Fuehrendes und folgendes "Geraffel" verwerfen */
136 ngt_TrimStr( Request );
138 /* gibt es ein Prefix? */
139 if( Request[0] == ':' )
141 /* Prefix vorhanden */
142 req.prefix = Request + 1;
143 ptr = strchr( Request, ' ' );
146 Log( LOG_DEBUG, "Connection %d: Parse error: prefix without command!?", Idx );
147 return Conn_WriteStr( Idx, "ERROR :Prefix without command!?" );
151 /* multiple Leerzeichen als Trenner zwischen
152 * Prefix und Befehl ignorieren */
153 while( *(ptr + 1) == ' ' ) ptr++;
157 else start = Request;
160 ptr = strchr( start, ' ' );
165 /* multiple Leerzeichen als Trenner vor
166 *Parametertrennern ignorieren */
167 while( *(ptr + 1) == ' ' ) ptr++;
172 /* Argumente, Parameter */
175 /* Prinzipiell gibt es welche :-) */
179 /* Parameter-String "zerlegen" */
180 if( start[0] == ':' )
182 req.argv[req.argc] = start + 1;
187 req.argv[req.argc] = start;
188 ptr = strchr( start, ' ' );
193 /* multiple Leerzeichen als
194 * Parametertrenner ignorieren */
195 while( *(ptr + 1) == ' ' ) ptr++;
202 if( start[0] == ':' ) break;
203 if( req.argc > 14 ) break;
205 if( ptr ) start = ptr + 1;
210 /* Daten validieren */
211 if( ! Validate_Prefix( Idx, &req, &closed )) return ! closed;
212 if( ! Validate_Command( Idx, &req, &closed )) return ! closed;
213 if( ! Validate_Args( Idx, &req, &closed )) return ! closed;
215 return Handle_Request( Idx, &req );
216 } /* Parse_Request */
220 Init_Request( REQUEST *Req )
222 /* Neue Request-Struktur initialisieren */
226 assert( Req != NULL );
230 for( i = 0; i < 15; Req->argv[i++] = NULL );
236 Validate_Prefix( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
241 assert( Req != NULL );
245 /* ist ueberhaupt ein Prefix vorhanden? */
246 if( ! Req->prefix ) return TRUE;
248 /* Client-Struktur der Connection ermitteln */
249 client = Client_GetFromConn( Idx );
250 assert( client != NULL );
252 /* nur validieren, wenn bereits registrierte Verbindung */
253 if(( Client_Type( client ) != CLIENT_USER ) && ( Client_Type( client ) != CLIENT_SERVER ) && ( Client_Type( client ) != CLIENT_SERVICE ))
255 /* noch nicht registrierte Verbindung.
256 * Das Prefix wird ignoriert. */
261 /* pruefen, ob der im Prefix angegebene Client bekannt ist */
262 c = Client_Search( Req->prefix );
265 /* im Prefix angegebener Client ist nicht bekannt */
266 Log( LOG_ERR, "Invalid prefix \"%s\", client not known (connection %d, command %s)!?", Req->prefix, Idx, Req->command );
267 if( ! Conn_WriteStr( Idx, "ERROR :Invalid prefix \"%s\", client not known!?", Req->prefix )) *Closed = TRUE;
271 /* pruefen, ob der Client mit dem angegebenen Prefix in Richtung
272 * des Senders liegt, d.h. sicherstellen, dass das Prefix nicht
274 if( Client_NextHop( c ) != client )
276 /* das angegebene Prefix ist aus dieser Richtung, also
277 * aus der gegebenen Connection, ungueltig! */
278 Log( LOG_ERR, "Spoofed prefix \"%s\" from \"%s\" (connection %d, command %s)!", Req->prefix, Client_Mask( Client_GetFromConn( Idx )), Idx, Req->command );
279 Conn_Close( Idx, NULL, "Spoofed prefix", TRUE );
285 } /* Validate_Prefix */
289 Validate_Command( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
292 assert( Req != NULL );
296 } /* Validate_Comman */
300 Validate_Args( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
303 assert( Req != NULL );
307 } /* Validate_Args */
311 Handle_Request( CONN_ID Idx, REQUEST *Req )
313 /* Client-Request verarbeiten. Bei einem schwerwiegenden Fehler
314 * wird die Verbindung geschlossen und FALSE geliefert. */
316 CLIENT *client, *target, *prefix;
323 assert( Req != NULL );
324 assert( Req->command != NULL );
326 client = Client_GetFromConn( Idx );
327 assert( client != NULL );
329 /* Statuscode, der geforwarded werden muss? */
330 if(( strlen( Req->command ) == 3 ) && ( atoi( Req->command ) > 100 ))
332 /* Befehl ist ein Statuscode */
334 /* Zielserver ermitteln */
335 if(( Client_Type( client ) == CLIENT_SERVER ) && ( Req->argc > 0 )) target = Client_Search( Req->argv[0] );
339 if( Req->argc > 0 ) Log( LOG_WARNING, "Unknown target for status code %s: \"%s\"", Req->command, Req->argv[0] );
340 else Log( LOG_WARNING, "Unknown target for status code %s!", Req->command );
343 if( target == Client_ThisServer( ))
345 Log( LOG_DEBUG, "Ignored status code %s from \"%s\".", Req->command, Client_ID( client ));
349 /* Quell-Client ermitteln */
350 if( ! Req->prefix[0] )
352 Log( LOG_WARNING, "Got status code without prefix!?" );
355 else prefix = Client_Search( Req->prefix );
358 Log( LOG_WARNING, "Got status code from unknown source: \"%s\"", Req->prefix );
362 /* Statuscode weiterleiten */
363 strlcpy( str, Req->command, sizeof( str ));
364 for( i = 0; i < Req->argc; i++ )
366 if( i < Req->argc - 1 ) strlcat( str, " ", sizeof( str ));
367 else strlcat( str, " :", sizeof( str ));
368 strlcat( str, Req->argv[i], sizeof( str ));
370 return IRC_WriteStrClientPrefix( target, prefix, "%s", str );
377 if( strcasecmp( Req->command, cmd->name ) != 0 )
382 if( Client_Type( client ) & cmd->type )
384 /* Command is allowed for this client: call it and count produced bytes */
385 Conn_ResetWCounter( );
386 result = (cmd->function)( client, Req );
387 cmd->bytes += Conn_WCounter( );
389 /* Adjust counters */
390 if( Client_Type( client ) != CLIENT_SERVER ) cmd->lcount++;
397 /* Befehl ist fuer diesen Client-Typ nicht erlaubt! */
398 return IRC_WriteStrClient( client, ERR_NOTREGISTERED_MSG, Client_ID( client ));
402 /* Unbekannter Befehl */
403 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" );
404 if( Client_Type( client ) != CLIENT_SERVER ) return IRC_WriteStrClient( client, ERR_UNKNOWNCOMMAND_MSG, Client_ID( client ), Req->command );
406 } /* Handle_Request */