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/*
** smcroute - static multicast routing control
** Copyright (C) 2001 Carsten Schill <carsten@cschill.de>
**
** 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.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
**
** $Id: mcgroup.c,v 1.2 2001/08/26 19:56:08 cschill Exp $
**
** This module contains the remaining functions that where not placed in
** separate modules
**
*/
#include "mclab.h"
static int joinleave( int Cmd, int UdpSock, const char *IfName, struct in_addr McAdr )
/*
**
*/
{
struct ip_mreq CtlReq;
struct IfDesc *IfDp = getIfByName( IfName );
const char *CmdSt = Cmd == 'j' ? "join" : "leave";
if( ! IfDp ) {
smclog( LOG_WARNING, 0, "%sMcGroup, unknown interface %s", CmdSt, IfName );
return 1;
}
CtlReq.imr_multiaddr.s_addr = McAdr.s_addr;
CtlReq.imr_interface.s_addr = IfDp->InAdr.s_addr;
{
char FmtBu[ 32 ];
smclog( LOG_NOTICE, 0, "%sMcGroup: %s on %s", CmdSt,
fmtInAdr( FmtBu, McAdr ), IfDp ? IfDp->Name : "<any>" );
}
if( setsockopt( UdpSock, IPPROTO_IP,
Cmd == 'j' ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP,
(void *)&CtlReq, sizeof( CtlReq ) ) )
{
smclog( LOG_WARNING, errno, "MRT_%s_MEMBERSHIP failed", Cmd == 'j' ? "ADD" : "DROP" );
return 1;
}
return 0;
}
int joinMcGroup( int UdpSock, const char *IfName, struct in_addr McAdr )
/*
** Joins the MC group with the address 'McAdr' on the interface 'IfName'.
** The join is bound to the UDP socket 'UdpSock', so if this socket is
** closed the membership is dropped.
**
** returns: - 0 if the function succeeds
** - 1 if parameters are wrong or the join fails
*/
{
return joinleave( 'j', UdpSock, IfName, McAdr );
}
int leaveMcGroup( int UdpSock, const char *IfName, struct in_addr McAdr )
/*
** Leaves the MC group with the address 'McAdr' on the interface 'IfName'.
**
** returns: - 0 if the function succeeds
** - 1 if parameters are wrong or the join fails
*/
{
return joinleave( 'l', UdpSock, IfName, McAdr );
}
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