84 lines
1.6 KiB
Go
84 lines
1.6 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin dragonfly freebsd netbsd openbsd windows
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package ipv4
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import "net"
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func setIPMreqInterface(mreq *sysIPMreq, ifi *net.Interface) error {
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if ifi == nil {
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return nil
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}
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ifat, err := ifi.Addrs()
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if err != nil {
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return err
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}
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for _, ifa := range ifat {
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switch ifa := ifa.(type) {
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case *net.IPAddr:
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if ip := ifa.IP.To4(); ip != nil {
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copy(mreq.Interface[:], ip)
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return nil
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}
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case *net.IPNet:
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if ip := ifa.IP.To4(); ip != nil {
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copy(mreq.Interface[:], ip)
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return nil
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}
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}
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}
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return errNoSuchInterface
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}
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func netIP4ToInterface(ip net.IP) (*net.Interface, error) {
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ift, err := net.Interfaces()
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if err != nil {
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return nil, err
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}
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for _, ifi := range ift {
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ifat, err := ifi.Addrs()
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if err != nil {
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return nil, err
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}
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for _, ifa := range ifat {
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switch ifa := ifa.(type) {
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case *net.IPAddr:
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if ip.Equal(ifa.IP) {
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return &ifi, nil
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}
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case *net.IPNet:
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if ip.Equal(ifa.IP) {
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return &ifi, nil
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}
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}
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}
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}
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return nil, errNoSuchInterface
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}
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func netInterfaceToIP4(ifi *net.Interface) (net.IP, error) {
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if ifi == nil {
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return net.IPv4zero.To4(), nil
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}
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ifat, err := ifi.Addrs()
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if err != nil {
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return nil, err
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}
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for _, ifa := range ifat {
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switch ifa := ifa.(type) {
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case *net.IPAddr:
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if ip := ifa.IP.To4(); ip != nil {
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return ip, nil
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}
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case *net.IPNet:
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if ip := ifa.IP.To4(); ip != nil {
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return ip, nil
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}
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}
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}
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return nil, errNoSuchInterface
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}
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