64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package net
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import (
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"os"
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"syscall"
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)
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// interfaceMulticastAddrTable returns addresses for a specific
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// interface.
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func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
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tab, err := syscall.RouteRIB(syscall.NET_RT_IFMALIST, ifi.Index)
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if err != nil {
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return nil, os.NewSyscallError("route rib", err)
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}
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msgs, err := syscall.ParseRoutingMessage(tab)
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if err != nil {
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return nil, os.NewSyscallError("route message", err)
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}
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var ifmat []Addr
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for _, m := range msgs {
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switch m := m.(type) {
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case *syscall.InterfaceMulticastAddrMessage:
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if ifi.Index == int(m.Header.Index) {
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ifma, err := newMulticastAddr(ifi, m)
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if err != nil {
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return nil, err
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}
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ifmat = append(ifmat, ifma...)
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}
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}
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}
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return ifmat, nil
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}
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func newMulticastAddr(ifi *Interface, m *syscall.InterfaceMulticastAddrMessage) ([]Addr, error) {
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sas, err := syscall.ParseRoutingSockaddr(m)
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if err != nil {
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return nil, os.NewSyscallError("route sockaddr", err)
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}
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var ifmat []Addr
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for _, sa := range sas {
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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ifma := &IPAddr{IP: IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3])}
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ifmat = append(ifmat, ifma.toAddr())
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case *syscall.SockaddrInet6:
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ifma := &IPAddr{IP: make(IP, IPv6len)}
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copy(ifma.IP, sa.Addr[:])
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// NOTE: KAME based IPv6 protocol stack usually embeds
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// the interface index in the interface-local or link-
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// local address as the kernel-internal form.
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if ifma.IP.IsInterfaceLocalMulticast() || ifma.IP.IsLinkLocalMulticast() {
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ifma.IP[2], ifma.IP[3] = 0, 0
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}
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ifmat = append(ifmat, ifma.toAddr())
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}
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}
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return ifmat, nil
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}
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