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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
}
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