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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
}