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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 FreeBSD
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, os.Error) {
var (
tab []byte
e int
msgs []syscall.RoutingMessage
ifmat []Addr
)
tab, e = syscall.RouteRIB(syscall.NET_RT_IFMALIST, ifindex)
if e != 0 {
return nil, os.NewSyscallError("route rib", e)
}
msgs, e = syscall.ParseRoutingMessage(tab)
if e != 0 {
return nil, os.NewSyscallError("route message", e)
}
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
}
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