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.
16 * IRC commands for server links
28 #include "conn-func.h"
32 #include "irc-write.h"
43 #include "irc-server.h"
47 * Handler for the IRC command "SERVER".
48 * See RFC 2813 section 4.1.2.
51 IRC_SERVER( CLIENT *Client, REQUEST *Req )
58 assert( Client != NULL );
59 assert( Req != NULL );
61 /* Return an error if this is not a local client */
62 if (Client_Conn(Client) <= NONE)
63 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
64 Client_ID(Client), Req->command);
66 if (Client_Type(Client) == CLIENT_GOTPASS ||
67 Client_Type(Client) == CLIENT_GOTPASS_2813) {
68 /* We got a PASS command from the peer, and now a SERVER
69 * command: the peer tries to register itself as a server. */
70 LogDebug("Connection %d: got SERVER command (new server link) ...",
73 if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
75 /* Ist this server configured on out side? */
76 for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
77 if( i >= MAX_SERVERS )
79 Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
80 Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", true);
83 if( strcmp( Conn_Password( Client_Conn( Client ) ), Conf_Server[i].pwd_in ) != 0 )
86 Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
87 Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
91 /* Is there a registered server with this ID? */
92 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
94 Client_SetID( Client, Req->argv[0] );
95 Client_SetHops( Client, 1 );
96 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
98 /* Is this server registering on our side, or are we connecting to
100 con = Client_Conn(Client);
101 if (Client_Token(Client) != TOKEN_OUTBOUND) {
102 /* Incoming connection, send user/pass */
103 if (!IRC_WriteStrClient(Client, "PASS %s %s",
104 Conf_Server[i].pwd_out,
106 || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
109 Conn_Close(con, "Unexpected server behavior!",
113 Client_SetIntroducer(Client, Client);
114 Client_SetToken(Client, 1);
116 /* outgoing connect, we already sent a SERVER and PASS
117 * command to the peer */
118 Client_SetToken(Client, atoi(Req->argv[1]));
121 /* Mark this connection as belonging to an configured server */
122 Conf_SetServer(i, con);
124 /* Check protocol level */
125 if (Client_Type(Client) == CLIENT_GOTPASS) {
126 /* We got a "simple" PASS command, so the peer is
127 * using the protocol as defined in RFC 1459. */
128 if (! (Conn_Options(con) & CONN_RFC1459))
130 "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
131 con, Client_ID(Client));
132 Conn_SetOption(con, CONN_RFC1459);
135 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
138 if (strchr(Client_Flags(Client), 'Z') && !Zip_InitConn(con)) {
139 Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
145 if (strchr(Client_Flags(Client), 'H')) {
146 LogDebug("Peer supports IRC+ extended server handshake ...");
147 if (!IRC_Send_ISUPPORT(Client))
149 return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
153 if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
155 "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
160 return IRC_Num_ENDOFMOTD(Client, Req);
162 else if( Client_Type( Client ) == CLIENT_SERVER )
164 /* New server is being introduced to the network */
166 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
168 /* check for existing server with same ID */
169 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
171 from = Client_Search( Req->prefix );
174 /* Uh, Server, that introduced the new server is unknown?! */
175 Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
176 Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
180 c = Client_NewRemoteServer(Client, Req->argv[0], from, atoi(Req->argv[1]), atoi(Req->argv[2]), Req->argv[3], true);
182 Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
183 Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
187 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
188 else strcpy( str, "" );
189 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": "" );
191 /* notify other servers */
192 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
196 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
197 Client_ID(Client), Req->command);
202 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
204 char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
205 bool is_op, is_voiced;
209 assert( Client != NULL );
210 assert( Req != NULL );
212 if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
214 strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
215 strcpy( nick_out, "" );
217 channame = Req->argv[0];
218 ptr = strtok( nick_in, "," );
221 is_op = is_voiced = false;
223 /* cut off prefixes */
224 while(( *ptr == '@' ) || ( *ptr == '+' ))
226 if( *ptr == '@' ) is_op = true;
227 if( *ptr == '+' ) is_voiced = true;
231 c = Client_Search( ptr );
234 Channel_Join( c, channame );
235 chan = Channel_Search( channame );
236 assert( chan != NULL );
238 if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
239 if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
241 /* announce to channel... */
242 IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
244 /* set Channel-User-Modes */
245 strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
248 /* send modes to channel */
249 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
252 if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
253 if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
254 if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
255 strlcat( nick_out, ptr, sizeof( nick_out ));
257 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
259 /* search for next Nick */
260 ptr = strtok( NULL, "," );
263 /* forward to other servers */
264 if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
271 * Handler for the IRC command "SQUIT".
272 * See RFC 2813 section 4.1.2 and RFC 2812 section 3.1.8.
275 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
277 char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
278 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 if (Client_Type(Client) == CLIENT_USER)
306 loglevel = LOG_NOTICE | LOG_snotice;
308 loglevel = LOG_DEBUG;
309 Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
310 Client_ID(from), Req->argv[0], Req->argv[1]);
312 target = Client_Search(Req->argv[0]);
313 if (Client_Type(Client) != CLIENT_SERVER &&
314 target == Client_ThisServer())
315 return Op_NoPrivileges(Client, Req);
317 /* The server is (already) unknown */
319 "Got SQUIT from %s for unknown server \"%s\"!?",
320 Client_ID(Client), Req->argv[0]);
324 con = Client_Conn(target);
327 if (Client_NextHop(from) != Client || con > NONE)
328 snprintf(msg, sizeof(msg), "%s (SQUIT from %s)",
329 Req->argv[1], Client_ID(from));
331 strlcpy(msg, Req->argv[1], sizeof(msg));
333 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
337 /* We are directly connected to the target server, so we
338 * have to tear down the connection and to inform all the
339 * other remaining servers in the network */
340 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
341 "Received SQUIT %s from %s: %s",
342 Req->argv[0], Client_ID(from),
343 Req->argv[1][0] ? Req->argv[1] : "-");
344 Conn_Close(con, NULL, msg, true);
345 if (con == Client_Conn(Client))
348 /* This server is not directly connected, so the SQUIT must
349 * be forwarded ... */
350 if (Client_Type(from) != CLIENT_SERVER) {
351 /* The origin is not an IRC server, so don't evaluate
352 * this SQUIT but simply forward it */
353 IRC_WriteStrClientPrefix(Client_NextHop(target),
354 from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
356 /* SQUIT has been generated by another server, so
357 * remove the target server from the network! */
359 if (!strchr(msg, '('))
360 snprintf(logmsg, sizeof(logmsg),
361 "%s (SQUIT from %s)", Req->argv[1],
363 Client_Destroy(target, logmsg[0] ? logmsg : msg,