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 typ := route.RIBType(syscall.NET_RT_IFLISTL) 15 rib, err := route.FetchRIB(syscall.AF_UNSPEC, typ, ifindex) 16 if err != nil { 17 typ = route.RIBType(syscall.NET_RT_IFLIST) 18 rib, err = route.FetchRIB(syscall.AF_UNSPEC, typ, ifindex) 19 } 20 if err != nil { 21 return nil, err 22 } 23 return route.ParseRIB(typ, rib) 24 } 25 26 // interfaceMulticastAddrTable returns addresses for a specific 27 // interface. 28 func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) { 29 rib, err := route.FetchRIB(syscall.AF_UNSPEC, syscall.NET_RT_IFMALIST, ifi.Index) 30 if err != nil { 31 return nil, err 32 } 33 msgs, err := route.ParseRIB(syscall.NET_RT_IFMALIST, rib) 34 if err != nil { 35 return nil, err 36 } 37 ifmat := make([]Addr, 0, len(msgs)) 38 for _, m := range msgs { 39 switch m := m.(type) { 40 case *route.InterfaceMulticastAddrMessage: 41 if ifi.Index != m.Index { 42 continue 43 } 44 var ip IP 45 switch sa := m.Addrs[syscall.RTAX_IFA].(type) { 46 case *route.Inet4Addr: 47 ip = IPv4(sa.IP[0], sa.IP[1], sa.IP[2], sa.IP[3]) 48 case *route.Inet6Addr: 49 ip = make(IP, IPv6len) 50 copy(ip, sa.IP[:]) 51 } 52 if ip != nil { 53 ifmat = append(ifmat, &IPAddr{IP: ip}) 54 } 55 } 56 } 57 return ifmat, nil 58 } 59
