// Copyright (C) 2013 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

#include <dhcp/pkt_filter6.h>

namespace isc {
namespace dhcp {

bool
PktFilter6::joinMulticast(int sock, const std::string& ifname,
                          const std::string & mcast) {

    struct ipv6_mreq mreq;
    memset(&mreq, 0, sizeof(ipv6_mreq));

    // Convert the multicast address to a binary form.
    if (inet_pton(AF_INET6, mcast.c_str(), &mreq.ipv6mr_multiaddr) <= 0) {
        return (false);
    }
    // Set the interface being used.
    mreq.ipv6mr_interface = if_nametoindex(ifname.c_str());
    // Join the multicast group.
    if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
                   &mreq, sizeof(mreq)) < 0) {
        return (false);
    }

    return (true);
}


} // end of isc::dhcp namespace
} // end of isc namespace
