2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2013 Alexander Barton (alex@barton.de) and Contributors.
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"
39 #include "irc-macros.h"
40 #include "irc-write.h"
44 #include "irc-server.h"
47 * Handler for the IRC "SERVER" command.
49 * @param Client The client from which this command has been received.
50 * @param Req Request structure with prefix and all parameters.
51 * @return CONNECTED or DISCONNECTED.
54 IRC_SERVER( CLIENT *Client, REQUEST *Req )
60 assert( Client != NULL );
61 assert( Req != NULL );
63 /* Return an error if this is not a local client */
64 if (Client_Conn(Client) <= NONE)
65 return IRC_WriteErrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
66 Client_ID(Client), Req->command);
68 if (Client_Type(Client) == CLIENT_GOTPASS ||
69 Client_Type(Client) == CLIENT_GOTPASS_2813) {
70 /* We got a PASS command from the peer, and now a SERVER
71 * command: the peer tries to register itself as a server. */
72 LogDebug("Connection %d: got SERVER command (new server link) ...",
75 if (Req->argc != 2 && Req->argc != 3)
76 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
80 /* Get configuration index of new remote server ... */
81 for (i = 0; i < MAX_SERVERS; i++)
82 if (strcasecmp(Req->argv[0], Conf_Server[i].name) == 0)
85 /* Make sure the remote server is configured here */
86 if (i >= MAX_SERVERS) {
88 "Connection %d: Server \"%s\" not configured here!",
89 Client_Conn(Client), Req->argv[0]);
90 Conn_Close(Client_Conn(Client), NULL,
91 "Server not configured here", true);
95 /* Check server password */
96 if (strcmp(Conn_Password(Client_Conn(Client)),
97 Conf_Server[i].pwd_in) != 0) {
99 "Connection %d: Got bad password from server \"%s\"!",
100 Client_Conn(Client), Req->argv[0]);
101 Conn_Close(Client_Conn(Client), NULL,
102 "Bad password", true);
106 /* Is there a registered server with this ID? */
107 if (!Client_CheckID(Client, Req->argv[0]))
110 /* Mark this connection as belonging to an configured server */
111 if (!Conf_SetServer(i, Client_Conn(Client)))
114 Client_SetID( Client, Req->argv[0] );
115 Client_SetHops( Client, 1 );
116 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
118 /* Is this server registering on our side, or are we connecting to
119 * a remote server? */
120 if (Client_Token(Client) != TOKEN_OUTBOUND) {
121 /* Incoming connection, send user/pass */
122 if (!IRC_WriteStrClient(Client, "PASS %s %s",
123 Conf_Server[i].pwd_out,
125 || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
128 Conn_Close(Client_Conn(Client),
129 "Unexpected server behavior!",
133 Client_SetIntroducer(Client, Client);
134 Client_SetToken(Client, 1);
136 /* outgoing connect, we already sent a SERVER and PASS
137 * command to the peer */
138 Client_SetToken(Client, atoi(Req->argv[1]));
141 /* Check protocol level */
142 if (Client_Type(Client) == CLIENT_GOTPASS) {
143 /* We got a "simple" PASS command, so the peer is
144 * using the protocol as defined in RFC 1459. */
145 if (! (Conn_Options(Client_Conn(Client)) & CONN_RFC1459))
147 "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
148 Client_Conn(Client), Client_ID(Client));
149 Conn_SetOption(Client_Conn(Client), CONN_RFC1459);
152 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
155 if (Client_HasFlag(Client, 'Z')
156 && !Zip_InitConn(Client_Conn(Client))) {
157 Conn_Close(Client_Conn(Client),
158 "Can't initialize compression (zlib)!",
165 if (Client_HasFlag(Client, 'H')) {
166 LogDebug("Peer supports IRC+ extended server handshake ...");
167 if (!IRC_Send_ISUPPORT(Client))
169 return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
173 if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
175 "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
180 return IRC_Num_ENDOFMOTD(Client, Req);
182 else if( Client_Type( Client ) == CLIENT_SERVER )
184 /* New server is being introduced to the network */
187 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
188 Client_ID(Client), Req->command);
190 /* check for existing server with same ID */
191 if (!Client_CheckID(Client, Req->argv[0]))
194 from = Client_Search( Req->prefix );
196 /* Uh, Server, that introduced the new server is unknown?! */
198 "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)",
199 Req->prefix, Client_Conn(Client));
200 Conn_Close(Client_Conn(Client), NULL,
201 "Unknown ID in prefix of SERVER", true);
205 c = Client_NewRemoteServer(Client, Req->argv[0], from,
206 atoi(Req->argv[1]), atoi(Req->argv[2]),
210 "Can't create client structure for server! (on connection %d)",
211 Client_Conn(Client));
212 Conn_Close(Client_Conn(Client), NULL,
213 "Can't allocate client structure for remote server",
218 if (Client_Hops(c) > 1 && Req->prefix[0])
219 snprintf(str, sizeof(str), "connected to %s, ",
223 Log(LOG_NOTICE|LOG_snotice,
224 "Server \"%s\" registered (via %s, %s%d hop%s).",
225 Client_ID(c), Client_ID(Client), str, Client_Hops(c),
226 Client_Hops(c) > 1 ? "s": "" );
228 /* notify other servers */
229 IRC_WriteStrServersPrefix(Client, from, "SERVER %s %d %d :%s",
230 Client_ID(c), Client_Hops(c) + 1,
231 Client_MyToken(c), Client_Info(c));
235 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
236 Client_ID(Client), Req->command);
240 * Handler for the IRC "NJOIN" command.
242 * @param Client The client from which this command has been received.
243 * @param Req Request structure with prefix and all parameters.
244 * @return CONNECTED or DISCONNECTED.
247 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
249 char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
250 bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
254 assert( Client != NULL );
255 assert( Req != NULL );
257 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 2)
259 strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
260 strcpy( nick_out, "" );
262 channame = Req->argv[0];
263 ptr = strtok( nick_in, "," );
266 is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
268 /* cut off prefixes */
269 while(( *ptr == '~') || ( *ptr == '&' ) || ( *ptr == '@' ) ||
270 ( *ptr == '%') || ( *ptr == '+' ))
272 if( *ptr == '~' ) is_owner = true;
273 if( *ptr == '&' ) is_chanadmin = true;
274 if( *ptr == '@' ) is_op = true;
275 if( *ptr == 'h' ) is_halfop = true;
276 if( *ptr == '+' ) is_voiced = true;
280 c = Client_Search( ptr );
283 Channel_Join( c, channame );
284 chan = Channel_Search( channame );
285 assert( chan != NULL );
287 if( is_owner ) Channel_UserModeAdd( chan, c, 'q' );
288 if( is_chanadmin ) Channel_UserModeAdd( chan, c, 'a' );
289 if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
290 if( is_halfop ) Channel_UserModeAdd( chan, c, 'h' );
291 if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
293 /* announce to channel... */
294 IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
296 /* set Channel-User-Modes */
297 strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
300 /* send modes to channel */
301 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
304 if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
305 if( is_owner ) strlcat( nick_out, "~", sizeof( nick_out ));
306 if( is_chanadmin ) strlcat( nick_out, "&", sizeof( nick_out ));
307 if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
308 if( is_halfop ) strlcat( nick_out, "%", sizeof( nick_out ));
309 if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
310 strlcat( nick_out, ptr, sizeof( nick_out ));
312 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
314 /* search for next Nick */
315 ptr = strtok( NULL, "," );
318 /* forward to other servers */
319 if (nick_out[0] != '\0')
320 IRC_WriteStrServersPrefix(Client, Client_ThisServer(),
321 "NJOIN %s :%s", Req->argv[0], nick_out);
327 * Handler for the IRC "SQUIT" command.
329 * @param Client The client from which this command has been received.
330 * @param Req Request structure with prefix and all parameters.
331 * @return CONNECTED or DISCONNECTED.
334 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
336 char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
337 CLIENT *from, *target;
341 assert(Client != NULL);
344 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 2)
346 if (Client_Type(Client) != CLIENT_SERVER
347 && !Client_HasMode(Client, 'o'))
348 return Op_NoPrivileges(Client, Req);
350 if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
351 from = Client_Search(Req->prefix);
352 if (Client_Type(from) != CLIENT_SERVER
353 && !Op_Check(Client, Req))
354 return Op_NoPrivileges(Client, Req);
358 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
359 Client_ID(Client), Req->prefix);
361 if (Client_Type(Client) == CLIENT_USER)
362 loglevel = LOG_NOTICE | LOG_snotice;
364 loglevel = LOG_DEBUG;
365 Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
366 Client_ID(from), Req->argv[0], Req->argv[1]);
368 target = Client_Search(Req->argv[0]);
369 if (Client_Type(Client) != CLIENT_SERVER &&
370 target == Client_ThisServer())
371 return Op_NoPrivileges(Client, Req);
373 /* The server is (already) unknown */
375 "Got SQUIT from %s for unknown server \"%s\"!?",
376 Client_ID(Client), Req->argv[0]);
380 con = Client_Conn(target);
383 if (Client_NextHop(from) != Client || con > NONE)
384 snprintf(msg, sizeof(msg), "\"%s\" (SQUIT from %s)",
385 Req->argv[1], Client_ID(from));
387 strlcpy(msg, Req->argv[1], sizeof(msg));
389 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
393 /* We are directly connected to the target server, so we
394 * have to tear down the connection and to inform all the
395 * other remaining servers in the network */
396 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
397 "Received SQUIT %s from %s: %s",
398 Req->argv[0], Client_ID(from),
399 Req->argv[1][0] ? Req->argv[1] : "-");
400 Conn_Close(con, NULL, msg, true);
401 if (con == Client_Conn(Client))
404 /* This server is not directly connected, so the SQUIT must
405 * be forwarded ... */
406 if (Client_Type(from) != CLIENT_SERVER) {
407 /* The origin is not an IRC server, so don't evaluate
408 * this SQUIT but simply forward it */
409 IRC_WriteStrClientPrefix(Client_NextHop(target),
410 from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
412 /* SQUIT has been generated by another server, so
413 * remove the target server from the network! */
415 if (!strchr(msg, '('))
416 snprintf(logmsg, sizeof(logmsg),
417 "\"%s\" (SQUIT from %s)", Req->argv[1],
419 Client_Destroy(target, logmsg[0] ? logmsg : msg,