2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2007 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.
17 * IRC commands for server links
29 #include "conn-func.h"
33 #include "irc-write.h"
44 #include "irc-server.h"
48 * Handler for the IRC command "SERVER".
49 * See RFC 2813 section 4.1.2.
52 IRC_SERVER( CLIENT *Client, REQUEST *Req )
59 assert( Client != NULL );
60 assert( Req != NULL );
62 /* Return an error if this is not a local client */
63 if (Client_Conn(Client) <= NONE)
64 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
65 Client_ID(Client), Req->command);
67 if (Client_Type(Client) == CLIENT_GOTPASS ||
68 Client_Type(Client) == CLIENT_GOTPASS_2813) {
69 /* We got a PASS command from the peer, and now a SERVER
70 * command: the peer tries to register itself as a server. */
71 LogDebug("Connection %d: got SERVER command (new server link) ...",
74 if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
76 /* Ist this server configured on out side? */
77 for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
78 if( i >= MAX_SERVERS )
80 Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
81 Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", true);
84 if( strcmp( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
87 Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
88 Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
92 /* Is there a registered server with this ID? */
93 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
95 Client_SetID( Client, Req->argv[0] );
96 Client_SetHops( Client, 1 );
97 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
99 /* Is this server registering on our side, or are we connecting to
100 * a remote server? */
101 con = Client_Conn(Client);
102 if (Client_Token(Client) != TOKEN_OUTBOUND) {
103 /* Incoming connection, send user/pass */
104 if (!IRC_WriteStrClient(Client, "PASS %s %s",
105 Conf_Server[i].pwd_out,
107 || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
110 Conn_Close(con, "Unexpected server behavior!",
114 Client_SetIntroducer(Client, Client);
115 Client_SetToken(Client, 1);
117 /* outgoing connect, we already sent a SERVER and PASS
118 * command to the peer */
119 Client_SetToken(Client, atoi(Req->argv[1]));
122 /* Mark this connection as belonging to an configured server */
123 Conf_SetServer(i, con);
125 /* Check protocol level */
126 if (Client_Type(Client) == CLIENT_GOTPASS) {
127 /* We got a "simple" PASS command, so the peer is
128 * using the protocol as defined in RFC 1459. */
129 if (! (Conn_Options(con) & CONN_RFC1459))
131 "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
132 con, Client_ID(Client));
133 Conn_SetOption(con, CONN_RFC1459);
136 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
139 if (strchr(Client_Flags(Client), 'Z') && !Zip_InitConn(con)) {
140 Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
146 if (strchr(Client_Flags(Client), 'H')) {
147 LogDebug("Peer supports IRC+ extended server handshake ...");
148 if (!IRC_Send_ISUPPORT(Client))
150 return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
154 if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
156 "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
161 return IRC_Num_ENDOFMOTD(Client, Req);
163 else if( Client_Type( Client ) == CLIENT_SERVER )
165 /* New server is being introduced to the network */
167 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
169 /* check for existing server with same ID */
170 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
172 from = Client_Search( Req->prefix );
175 /* Uh, Server, that introduced the new server is unknown?! */
176 Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
177 Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
181 c = Client_NewRemoteServer(Client, Req->argv[0], from, atoi(Req->argv[1]), atoi(Req->argv[2]), Req->argv[3], true);
183 Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
184 Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
188 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
189 else strcpy( str, "" );
190 Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (via %s, %s%d hop%s).", Client_ID( c ), Client_ID( Client ), str, Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
192 /* notify other servers */
193 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
197 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
198 Client_ID(Client), Req->command);
203 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
205 char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
206 bool is_op, is_voiced;
210 assert( Client != NULL );
211 assert( Req != NULL );
213 if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
215 strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
216 strcpy( nick_out, "" );
218 channame = Req->argv[0];
219 ptr = strtok( nick_in, "," );
222 is_op = is_voiced = false;
224 /* cut off prefixes */
225 while(( *ptr == '@' ) || ( *ptr == '+' ))
227 if( *ptr == '@' ) is_op = true;
228 if( *ptr == '+' ) is_voiced = true;
232 c = Client_Search( ptr );
235 Channel_Join( c, channame );
236 chan = Channel_Search( channame );
237 assert( chan != NULL );
239 if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
240 if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
242 /* announce to channel... */
243 IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
245 /* set Channel-User-Modes */
246 strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
249 /* send modes to channel */
250 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
253 if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
254 if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
255 if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
256 strlcat( nick_out, ptr, sizeof( nick_out ));
258 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
260 /* search for next Nick */
261 ptr = strtok( NULL, "," );
264 /* forward to other servers */
265 if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
272 * Handler for the IRC command "SQUIT".
273 * See RFC 2813 section 4.1.2 and RFC 2812 section 3.1.8.
276 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
278 char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
279 CLIENT *from, *target;
282 assert(Client != NULL);
285 if (Client_Type(Client) != CLIENT_SERVER
286 && !Client_HasMode(Client, 'o'))
287 return Op_NoPrivileges(Client, Req);
289 /* Bad number of arguments? */
291 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
292 Client_ID(Client), Req->command);
294 if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
295 from = Client_Search(Req->prefix);
296 if (Client_Type(from) != CLIENT_SERVER
297 && !Op_Check(Client, Req))
298 return Op_NoPrivileges(Client, Req);
302 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
303 Client_ID(Client), Req->prefix);
305 Log(LOG_DEBUG, "Got SQUIT from %s for \"%s\": \"%s\" ...",
306 Client_ID(from), Req->argv[0], Req->argv[1]);
308 target = Client_Search(Req->argv[0]);
309 if (Client_Type(Client) != CLIENT_SERVER &&
310 target == Client_ThisServer())
311 return Op_NoPrivileges(Client, Req);
313 /* The server is (already) unknown */
315 "Got SQUIT from %s for unknown server \"%s\"!?",
316 Client_ID(Client), Req->argv[0]);
320 con = Client_Conn(target);
323 if (Client_NextHop(from) != Client || con > NONE)
324 snprintf(msg, sizeof(msg), "%s (SQUIT from %s)",
325 Req->argv[1], Client_ID(from));
327 strlcpy(msg, Req->argv[1], sizeof(msg));
329 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
333 /* We are directly connected to the target server, so we
334 * have to tear down the connection and to inform all the
335 * other remaining servers in the network */
336 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
337 "Received SQUIT %s from %s: %s",
338 Req->argv[0], Client_ID(from),
339 Req->argv[1][0] ? Req->argv[1] : "-");
340 Conn_Close(con, NULL, msg, true);
341 if (con == Client_Conn(Client))
344 /* This server is not directly connected, so the SQUIT must
345 * be forwarded ... */
346 if (Client_Type(from) != CLIENT_SERVER) {
347 /* The origin is not an IRC server, so don't evaluate
348 * this SQUIT but simply forward it */
349 IRC_WriteStrClientPrefix(Client_NextHop(target),
350 from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
352 /* SQUIT has been generated by another server, so
353 * remove the target server from the network! */
355 if (!strchr(msg, '('))
356 snprintf(logmsg, sizeof(logmsg),
357 "%s (SQUIT from %s)", Req->argv[1],
359 Client_Destroy(target, logmsg[0] ? logmsg : msg,