/*
* ngIRCd -- The Next Generation IRC Daemon
* Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* Please read the file COPYING, README and AUTHORS for more information.
*/
#include "portab.h"
/**
* @file
* IRC commands for server links
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "conn-func.h"
#include "conn-zip.h"
#include "conf.h"
#include "channel.h"
#include "log.h"
#include "messages.h"
#include "parse.h"
#include "numeric.h"
#include "ngircd.h"
#include "irc.h"
#include "irc-info.h"
#include "irc-write.h"
#include "op.h"
#include "irc-server.h"
/**
* Handler for the IRC "SERVER" command.
*
* @param Client The client from which this command has been received.
* @param Req Request structure with prefix and all parameters.
* @return CONNECTED or DISCONNECTED.
*/
GLOBAL bool
IRC_SERVER( CLIENT *Client, REQUEST *Req )
{
char str[100];
CLIENT *from, *c;
int i;
assert( Client != NULL );
assert( Req != NULL );
/* Return an error if this is not a local client */
if (Client_Conn(Client) <= NONE)
return IRC_WriteErrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
Client_ID(Client), Req->command);
if (Client_Type(Client) == CLIENT_GOTPASS ||
Client_Type(Client) == CLIENT_GOTPASS_2813) {
/* We got a PASS command from the peer, and now a SERVER
* command: the peer tries to register itself as a server. */
LogDebug("Connection %d: got SERVER command (new server link) ...",
Client_Conn(Client));
if (Req->argc != 2 && Req->argc != 3)
return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
Client_ID(Client),
Req->command);
/* Get configuration index of new remote server ... */
for (i = 0; i < MAX_SERVERS; i++)
if (strcasecmp(Req->argv[0], Conf_Server[i].name) == 0)
break;
/* Make sure the remote server is configured here */
if (i >= MAX_SERVERS) {
Log(LOG_ERR,
"Connection %d: Server \"%s\" not configured here!",
Client_Conn(Client), Req->argv[0]);
Conn_Close(Client_Conn(Client), NULL,
"Server not configured here", true);
return DISCONNECTED;
}
/* Check server password */
if (strcmp(Conn_Password(Client_Conn(Client)),
Conf_Server[i].pwd_in) != 0) {
Log(LOG_ERR,
"Connection %d: Got bad password from server \"%s\"!",
Client_Conn(Client), Req->argv[0]);
Conn_Close(Client_Conn(Client), NULL,
"Bad password", true);
return DISCONNECTED;
}
/* Is there a registered server with this ID? */
if (!Client_CheckID(Client, Req->argv[0]))
return DISCONNECTED;
/* Mark this connection as belonging to an configured server */
if (!Conf_SetServer(i, Client_Conn(Client)))
return DISCONNECTED;
Client_SetID( Client, Req->argv[0] );
Client_SetHops( Client, 1 );
Client_SetInfo( Client, Req->argv[Req->argc - 1] );
/* Is this server registering on our side, or are we connecting to
* a remote server? */
if (Client_Token(Client) != TOKEN_OUTBOUND) {
/* Incoming connection, send user/pass */
if (!IRC_WriteStrClient(Client, "PASS %s %s",
Conf_Server[i].pwd_out,
NGIRCd_ProtoID)
|| !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
Conf_ServerName,
Conf_ServerInfo)) {
Conn_Close(Client_Conn(Client),
"Unexpected server behavior!",
NULL, false);
return DISCONNECTED;
}
Client_SetIntroducer(Client, Client);
Client_SetToken(Client, 1);
} else {
/* outgoing connect, we already sent a SERVER and PASS
* command to the peer */
Client_SetToken(Client, atoi(Req->argv[1]));
}
/* Check protocol level */
if (Client_Type(Client) == CLIENT_GOTPASS) {
/* We got a "simple" PASS command, so the peer is
* using the protocol as defined in RFC 1459. */
if (! (Conn_Options(Client_Conn(Client)) & CONN_RFC1459))
Log(LOG_INFO,
"Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
Client_Conn(Client), Client_ID(Client));
Conn_SetOption(Client_Conn(Client), CONN_RFC1459);
}
Client_SetType(Client, CLIENT_UNKNOWNSERVER);
#ifdef ZLIB
if (Client_HasFlag(Client, 'Z')
&& !Zip_InitConn(Client_Conn(Client))) {
Conn_Close(Client_Conn(Client),
"Can't initialize compression (zlib)!",
NULL, false );
return DISCONNECTED;
}
#endif
#ifdef IRCPLUS
if (Client_HasFlag(Client, 'H')) {
LogDebug("Peer supports IRC+ extended server handshake ...");
if (!IRC_Send_ISUPPORT(Client))
return DISCONNECTED;
return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
Client_ID(Client));
} else {
#endif
if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
Log(LOG_CRIT,
"Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
#ifdef IRCPLUS
}
#endif
return IRC_Num_ENDOFMOTD(Client, Req);
}
else if( Client_Type( Client ) == CLIENT_SERVER )
{
/* New server is being introduced to the network */
if (Req->argc != 4)
return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
Client_ID(Client), Req->command);
/* check for existing server with same ID */
if (!Client_CheckID(Client, Req->argv[0]))
return DISCONNECTED;
if (!Req->prefix) {
/* We definitely need a prefix here! */
Log(LOG_ALERT, "Got SERVER command without prefix! (on connection %d)",
Client_Conn(Client));
Conn_Close(Client_Conn(Client), NULL,
"SERVER command without prefix", true);
return DISCONNECTED;
}
from = Client_Search( Req->prefix );
if (! from) {
/* Uh, Server, that introduced the new server is unknown?! */
Log(LOG_ALERT,
"Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)",
Req->prefix, Client_Conn(Client));
Conn_Close(Client_Conn(Client), NULL,
"Unknown ID in prefix of SERVER", true);
return DISCONNECTED;
}
c = Client_NewRemoteServer(Client, Req->argv[0], from,
atoi(Req->argv[1]), atoi(Req->argv[2]),
Req->argv[3], true);
if (!c) {
Log(LOG_ALERT,
"Can't create client structure for server! (on connection %d)",
Client_Conn(Client));
Conn_Close(Client_Conn(Client), NULL,
"Can't allocate client structure for remote server",
true);
return DISCONNECTED;
}
if (Client_Hops(c) > 1 && Req->prefix[0])
snprintf(str, sizeof(str), "connected to %s, ",
Client_ID(from));
else
strcpy(str, "");
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": "" );
/* notify other servers */
IRC_WriteStrServersPrefix(Client, from, "SERVER %s %d %d :%s",
Client_ID(c), Client_Hops(c) + 1,
Client_MyToken(c), Client_Info(c));
return CONNECTED;
} else
return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
Client_ID(Client), Req->command);
} /* IRC_SERVER */
/*
* Handler for the IRC "NJOIN" command.
*
* @param Client The client from which this command has been received.
* @param Req Request structure with prefix and all parameters.
* @return CONNECTED or DISCONNECTED.
*/
GLOBAL bool
IRC_NJOIN( CLIENT *Client, REQUEST *Req )
{
char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
CHANNEL *chan;
CLIENT *c;
assert(Client != NULL);
assert(Req != NULL);
strlcpy(nick_in, Req->argv[1], sizeof(nick_in));
strcpy(nick_out, "");
channame = Req->argv[0];
ptr = strtok(nick_in, ",");
while (ptr) {
is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
/* cut off prefixes */
while ((*ptr == '~') || (*ptr == '&') || (*ptr == '@') ||
(*ptr == '%') || (*ptr == '+')) {
if (*ptr == '~')
is_owner = true;
if (*ptr == '&')
is_chanadmin = true;
if (*ptr == '@')
is_op = true;
if (*ptr == '%')
is_halfop = true;
if (*ptr == '+')
is_voiced = true;
ptr++;
}
c = Client_Search(ptr);
if (!c) {
/* Client not found? */
Log(LOG_ERR,
"Got NJOIN for unknown nick \"%s\" for channel \"%s\"!",
ptr, channame);
goto skip_njoin;
}
if (!Channel_Join(c, channame)) {
/* Failed to join channel. Ooops!? */
Log(LOG_ALERT,
"Failed to join client \"%s\" to channel \"%s\" (NJOIN): killing it!",
ptr, channame);
IRC_KillClient(NULL, NULL, ptr, "Internal NJOIN error!");
Log(LOG_DEBUG, "... done.");
goto skip_njoin;
}
chan = Channel_Search(channame);
assert(chan != NULL);
if (is_owner)
Channel_UserModeAdd(chan, c, 'q');
if (is_chanadmin)
Channel_UserModeAdd(chan, c, 'a');
if (is_op)
Channel_UserModeAdd(chan, c, 'o');
if (is_halfop)
Channel_UserModeAdd(chan, c, 'h');
if (is_voiced)
Channel_UserModeAdd(chan, c, 'v');
/* Announce client to the channel */
IRC_WriteStrChannelPrefix(Client, chan, c, false,
"JOIN :%s", channame);
/* Announce "channel user modes" to the channel, if any */
strlcpy(modes, Channel_UserModes(chan, c), sizeof(modes));
if (modes[0])
IRC_WriteStrChannelPrefix(Client, chan, Client, false,
"MODE %s +%s %s", channame,
modes, Client_ID(c));
/* Build nick list for forwarding command */
if (nick_out[0] != '\0')
strlcat(nick_out, ",", sizeof(nick_out));
if (is_owner)
strlcat(nick_out, "~", sizeof(nick_out));
if (is_chanadmin)
strlcat(nick_out, "&", sizeof(nick_out));
if (is_op)
strlcat(nick_out, "@", sizeof(nick_out));
if (is_halfop)
strlcat(nick_out, "%", sizeof(nick_out));
if (is_voiced)
strlcat(nick_out, "+", sizeof(nick_out));
strlcat(nick_out, ptr, sizeof(nick_out));
skip_njoin:
/* Get next nick, if any ... */
ptr = strtok(NULL, ",");
}
/* forward to other servers */
if (nick_out[0] != '\0')
IRC_WriteStrServersPrefix(Client, Client_ThisServer(),
"NJOIN %s :%s", Req->argv[0], nick_out);
return CONNECTED;
} /* IRC_NJOIN */
/**
* Handler for the IRC "SQUIT" command.
*
* @param Client The client from which this command has been received.
* @param Req Request structure with prefix and all parameters.
* @return CONNECTED or DISCONNECTED.
*/
GLOBAL bool
IRC_SQUIT(CLIENT * Client, REQUEST * Req)
{
char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
CLIENT *from, *target;
CONN_ID con, client_con;
int loglevel;
assert(Client != NULL);
assert(Req != NULL);
if (Client_Type(Client) != CLIENT_SERVER
&& !Client_HasMode(Client, 'o'))
return Op_NoPrivileges(Client, Req);
if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
from = Client_Search(Req->prefix);
if (Client_Type(from) != CLIENT_SERVER
&& !Op_Check(Client, Req))
return Op_NoPrivileges(Client, Req);
} else
from = Client;
if (!from)
return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
Client_ID(Client), Req->prefix);
if (Client_Type(Client) == CLIENT_USER)
loglevel = LOG_NOTICE | LOG_snotice;
else
loglevel = LOG_DEBUG;
Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
Client_ID(from), Req->argv[0], Req->argv[1]);
target = Client_Search(Req->argv[0]);
if (Client_Type(Client) != CLIENT_SERVER &&
target == Client_ThisServer())
return Op_NoPrivileges(Client, Req);
if (!target) {
/* The server is (already) unknown */
Log(LOG_WARNING,
"Got SQUIT from %s for unknown server \"%s\"!?",
Client_ID(Client), Req->argv[0]);
return CONNECTED;
}
client_con = Client_Conn(Client);
con = Client_Conn(target);
if (Req->argv[1][0])
if (Client_NextHop(from) != Client || con > NONE)
snprintf(msg, sizeof(msg), "\"%s\" (SQUIT from %s)",
Req->argv[1], Client_ID(from));
else
strlcpy(msg, Req->argv[1], sizeof(msg));
else
snprintf(msg, sizeof(msg), "Got SQUIT from %s",
Client_ID(from));
if (con > NONE) {
/* We are directly connected to the target server, so we
* have to tear down the connection and to inform all the
* other remaining servers in the network */
IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
"Received SQUIT %s from %s: %s",
Req->argv[0], Client_ID(from),
Req->argv[1][0] ? Req->argv[1] : "-");
Conn_Close(con, NULL, msg, true);
if (con == client_con)
return DISCONNECTED;
} else {
/* This server is not directly connected, so the SQUIT must
* be forwarded ... */
if (Client_Type(from) != CLIENT_SERVER) {
/* The origin is not an IRC server, so don't evaluate
* this SQUIT but simply forward it */
IRC_WriteStrClientPrefix(Client_NextHop(target),
from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
} else {
/* SQUIT has been generated by another server, so
* remove the target server from the network! */
logmsg[0] = '\0';
if (!strchr(msg, '('))
snprintf(logmsg, sizeof(logmsg),
"\"%s\" (SQUIT from %s)", Req->argv[1],
Client_ID(from));
Client_Destroy(target, logmsg[0] ? logmsg : msg,
msg, false);
}
}
return CONNECTED;
} /* IRC_SQUIT */
/* -eof- */
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