ngircd-tor/src/ngircd/irc-server.c

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/*
* 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-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. */
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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,
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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 */
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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;
}
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/* 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;
}
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/* Is there a registered server with this ID? */
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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] );
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/* Is this server registering on our side, or are we connecting to
* a remote server? */
if (Client_Token(Client) != TOKEN_OUTBOUND) {
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/* 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)) {
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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.",
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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')
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&& !Zip_InitConn(Client_Conn(Client))) {
Conn_Close(Client_Conn(Client),
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"Can't initialize compression (zlib)!",
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NULL, false );
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return DISCONNECTED;
}
#endif
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#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 {
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#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 )
{
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/* New server is being introduced to the network */
if (Req->argc != 4)
return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
Client_ID(Client), Req->command);
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/* check for existing server with same ID */
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if (!Client_CheckID(Client, Req->argv[0]))
return DISCONNECTED;
from = Client_Search( Req->prefix );
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if (! from) {
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/* Uh, Server, that introduced the new server is unknown?! */
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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;
}
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c = Client_NewRemoteServer(Client, Req->argv[0], from,
atoi(Req->argv[1]), atoi(Req->argv[2]),
Req->argv[3], true);
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if (!c) {
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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;
}
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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": "" );
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/* notify other servers */
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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;
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/* 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 == 'h' ) is_halfop = true;
if( *ptr == '+' ) is_voiced = true;
ptr++;
}
c = Client_Search( ptr );
if( c )
{
Channel_Join( c, channame );
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' );
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/* announce to channel... */
IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
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/* set Channel-User-Modes */
strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
if( modes[0] )
{
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/* send modes to channel */
IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
}
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 ));
}
else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
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/* search for next Nick */
ptr = strtok( NULL, "," );
}
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/* 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;
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;
}
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_Conn(Client))
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- */