1 // Copyright 2011 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package net 6 7 import ( 8 "syscall" 9 10 "golang_org/x/net/route" 11 ) 12 13 func interfaceMessages(ifindex int) ([]route.Message, error) { 14 rib, err := route.FetchRIB(syscall.AF_UNSPEC, syscall.NET_RT_IFLIST, ifindex) 15 if err != nil { 16 return nil, err 17 } 18 return route.ParseRIB(syscall.NET_RT_IFLIST, rib) 19 } 20 21 // interfaceMulticastAddrTable returns addresses for a specific 22 // interface. 23 func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) { 24 rib, err := route.FetchRIB(syscall.AF_UNSPEC, syscall.NET_RT_IFLIST2, ifi.Index) 25 if err != nil { 26 return nil, err 27 } 28 msgs, err := route.ParseRIB(syscall.NET_RT_IFLIST2, rib) 29 if err != nil { 30 return nil, err 31 } 32 ifmat := make([]Addr, 0, len(msgs)) 33 for _, m := range msgs { 34 switch m := m.(type) { 35 case *route.InterfaceMulticastAddrMessage: 36 if ifi.Index != m.Index { 37 continue 38 } 39 var ip IP 40 switch sa := m.Addrs[syscall.RTAX_IFA].(type) { 41 case *route.Inet4Addr: 42 ip = IPv4(sa.IP[0], sa.IP[1], sa.IP[2], sa.IP[3]) 43 case *route.Inet6Addr: 44 ip = make(IP, IPv6len) 45 copy(ip, sa.IP[:]) 46 } 47 if ip != nil { 48 ifmat = append(ifmat, &IPAddr{IP: ip}) 49 } 50 } 51 } 52 return ifmat, nil 53 } 54
