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// Copyright 2011 The Go Authors.  All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// Network interface identification for Darwin

package net

import (

        "os"

        "syscall"

)

// If the ifindex is zero, interfaceMulticastAddrTable returns

// addresses for all network interfaces.  Otherwise it returns

// addresses for a specific interface.

func interfaceMulticastAddrTable(ifindex int) ([]Addr, error) {

        tab, err := syscall.RouteRIB(syscall.NET_RT_IFLIST2, ifindex)

        if err != nil {

                return nil, os.NewSyscallError("route rib", err)

        }

        msgs, err := syscall.ParseRoutingMessage(tab)

        if err != nil {

                return nil, os.NewSyscallError("route message", err)

        }

        var ifmat []Addr

        for _, m := range msgs {

                switch v := m.(type) {

                case *syscall.InterfaceMulticastAddrMessage:

                        if ifindex == 0 || ifindex == int(v.Header.Index) {

                                ifma, err := newMulticastAddr(v)

                                if err != nil {

                                        return nil, err

                                }

                                ifmat = append(ifmat, ifma...)

                        }

                }

        }

        return ifmat, nil

}

func newMulticastAddr(m *syscall.InterfaceMulticastAddrMessage) ([]Addr, error) {

        sas, err := syscall.ParseRoutingSockaddr(m)

        if err != nil {

                return nil, os.NewSyscallError("route sockaddr", err)

        }

        var ifmat []Addr

        for _, s := range sas {

                switch v := s.(type) {

                case *syscall.SockaddrInet4:

                        ifma := &IPAddr{IP: IPv4(v.Addr[0], v.Addr[1], v.Addr[2], v.Addr[3])}

                        ifmat = append(ifmat, ifma.toAddr())

                case *syscall.SockaddrInet6:

                        ifma := &IPAddr{IP: make(IP, IPv6len)}

                        copy(ifma.IP, v.Addr[:])

                        // NOTE: KAME based IPv6 protcol stack usually embeds

                        // the interface index in the interface-local or link-

                        // local address as the kernel-internal form.

                        if ifma.IP.IsInterfaceLocalMulticast() ||

                                ifma.IP.IsLinkLocalMulticast() {

                                // remove embedded scope zone ID

                                ifma.IP[2], ifma.IP[3] = 0, 0

                        }

                        ifmat = append(ifmat, ifma.toAddr())

                }

        }

        return ifmat, nil

}