| // 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 |
| } |
| |
| func newMulticastAddr(m *syscall.InterfaceMulticastAddrMessage) ([]Addr, os.Error) { |
| var ifmat []Addr |
| |
| sas, e := syscall.ParseRoutingSockaddr(m) |
| if e != 0 { |
| return nil, os.NewSyscallError("route sockaddr", e) |
| } |
| |
| 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 |
| } |