libgo/go/net/interface_darwin.go

   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 }