libgo/go/net/interface_freebsd.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         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 }