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  	"internal/routebsd"
     9  	"syscall"
    10  )
    11  
    12  func interfaceMessages(ifindex int) ([]routebsd.Message, error) {
    13  	return routebsd.FetchRIBMessages(syscall.NET_RT_IFLIST, ifindex)
    14  }
    15  
    16  // interfaceMulticastAddrTable returns addresses for a specific
    17  // interface.
    18  func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
    19  	msgs, err := routebsd.FetchRIBMessages(syscall.NET_RT_IFLIST2, ifi.Index)
    20  	if err != nil {
    21  		return nil, err
    22  	}
    23  	ifmat := make([]Addr, 0, len(msgs))
    24  	for _, m := range msgs {
    25  		switch m := m.(type) {
    26  		case *routebsd.InterfaceMulticastAddrMessage:
    27  			if ifi.Index != m.Index {
    28  				continue
    29  			}
    30  			var ip IP
    31  			switch sa := m.Addrs[syscall.RTAX_IFA].(type) {
    32  			case *routebsd.InetAddr:
    33  				if sa.IP.Is4() {
    34  					a := sa.IP.As4()
    35  					ip = IPv4(a[0], a[1], a[2], a[3])
    36  				} else if sa.IP.Is6() {
    37  					a := sa.IP.As16()
    38  					ip = make(IP, IPv6len)
    39  					copy(ip, a[:])
    40  				}
    41  			}
    42  			if ip != nil {
    43  				ifmat = append(ifmat, &IPAddr{IP: ip})
    44  			}
    45  		}
    46  	}
    47  	return ifmat, nil
    48  }
    49
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