Source file src/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	}
    54	

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