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 ) ),
84 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_owner, is_chanadmin, is_op, is_halfop, 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 == '&' ) || ( *ptr == '@' ) ||
226 ( *ptr == '%') || ( *ptr == '+' ))
228 if( *ptr == '~' ) is_owner = true;
229 if( *ptr == '&' ) is_chanadmin = true;
230 if( *ptr == '@' ) is_op = true;
231 if( *ptr == 'h' ) is_halfop = true;
232 if( *ptr == '+' ) is_voiced = true;
236 c = Client_Search( ptr );
239 Channel_Join( c, channame );
240 chan = Channel_Search( channame );
241 assert( chan != NULL );
243 if( is_owner ) Channel_UserModeAdd( chan, c, 'q' );
244 if( is_chanadmin ) Channel_UserModeAdd( chan, c, 'a' );
245 if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
246 if( is_halfop ) Channel_UserModeAdd( chan, c, 'h' );
247 if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
249 /* announce to channel... */
250 IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
252 /* set Channel-User-Modes */
253 strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
256 /* send modes to channel */
257 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
260 if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
261 if( is_owner ) strlcat( nick_out, "~", sizeof( nick_out ));
262 if( is_chanadmin ) strlcat( nick_out, "&", sizeof( nick_out ));
263 if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
264 if( is_halfop ) strlcat( nick_out, "%", sizeof( nick_out ));
265 if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
266 strlcat( nick_out, ptr, sizeof( nick_out ));
268 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
270 /* search for next Nick */
271 ptr = strtok( NULL, "," );
274 /* forward to other servers */
275 if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
282 * Handler for the IRC command "SQUIT".
283 * See RFC 2813 section 4.1.2 and RFC 2812 section 3.1.8.
286 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
288 char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
289 CLIENT *from, *target;
293 assert(Client != NULL);
296 if (Client_Type(Client) != CLIENT_SERVER
297 && !Client_HasMode(Client, 'o'))
298 return Op_NoPrivileges(Client, Req);
300 /* Bad number of arguments? */
302 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
303 Client_ID(Client), Req->command);
305 if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
306 from = Client_Search(Req->prefix);
307 if (Client_Type(from) != CLIENT_SERVER
308 && !Op_Check(Client, Req))
309 return Op_NoPrivileges(Client, Req);
313 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
314 Client_ID(Client), Req->prefix);
316 if (Client_Type(Client) == CLIENT_USER)
317 loglevel = LOG_NOTICE | LOG_snotice;
319 loglevel = LOG_DEBUG;
320 Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
321 Client_ID(from), Req->argv[0], Req->argv[1]);
323 target = Client_Search(Req->argv[0]);
324 if (Client_Type(Client) != CLIENT_SERVER &&
325 target == Client_ThisServer())
326 return Op_NoPrivileges(Client, Req);
328 /* The server is (already) unknown */
330 "Got SQUIT from %s for unknown server \"%s\"!?",
331 Client_ID(Client), Req->argv[0]);
335 con = Client_Conn(target);
338 if (Client_NextHop(from) != Client || con > NONE)
339 snprintf(msg, sizeof(msg), "%s (SQUIT from %s)",
340 Req->argv[1], Client_ID(from));
342 strlcpy(msg, Req->argv[1], sizeof(msg));
344 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
348 /* We are directly connected to the target server, so we
349 * have to tear down the connection and to inform all the
350 * other remaining servers in the network */
351 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
352 "Received SQUIT %s from %s: %s",
353 Req->argv[0], Client_ID(from),
354 Req->argv[1][0] ? Req->argv[1] : "-");
355 Conn_Close(con, NULL, msg, true);
356 if (con == Client_Conn(Client))
359 /* This server is not directly connected, so the SQUIT must
360 * be forwarded ... */
361 if (Client_Type(from) != CLIENT_SERVER) {
362 /* The origin is not an IRC server, so don't evaluate
363 * this SQUIT but simply forward it */
364 IRC_WriteStrClientPrefix(Client_NextHop(target),
365 from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
367 /* SQUIT has been generated by another server, so
368 * remove the target server from the network! */
370 if (!strchr(msg, '('))
371 snprintf(logmsg, sizeof(logmsg),
372 "%s (SQUIT from %s)", Req->argv[1],
374 Client_Destroy(target, logmsg[0] ? logmsg : msg,