Source file src/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	}
    59	

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