/usr/share/gocode/src/code.google.com/p/go.net/ipv4/helper.go is in golang-go.net-dev 0.0~hg20131201-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | // Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ipv4
import (
"errors"
"net"
)
var (
errNoSuchInterface = errors.New("no such interface")
errNoSuchMulticastInterface = errors.New("no such multicast interface")
)
func boolint(b bool) int {
if b {
return 1
}
return 0
}
func netAddrToIP4(a net.Addr) net.IP {
switch v := a.(type) {
case *net.UDPAddr:
if ip := v.IP.To4(); ip != nil {
return ip
}
case *net.IPAddr:
if ip := v.IP.To4(); ip != nil {
return ip
}
}
return nil
}
func netIP4ToInterface(ip net.IP) (*net.Interface, error) {
ift, err := net.Interfaces()
if err != nil {
return nil, err
}
for _, ifi := range ift {
ifat, err := ifi.Addrs()
if err != nil {
return nil, err
}
for _, ifa := range ifat {
switch v := ifa.(type) {
case *net.IPAddr:
if ip.Equal(v.IP) {
return &ifi, nil
}
case *net.IPNet:
if ip.Equal(v.IP) {
return &ifi, nil
}
}
}
}
return nil, errNoSuchInterface
}
func netInterfaceToIP4(ifi *net.Interface) (net.IP, error) {
if ifi == nil {
return net.IPv4zero, nil
}
ifat, err := ifi.Addrs()
if err != nil {
return nil, err
}
for _, ifa := range ifat {
switch v := ifa.(type) {
case *net.IPAddr:
if v.IP.To4() != nil {
return v.IP, nil
}
case *net.IPNet:
if v.IP.To4() != nil {
return v.IP, nil
}
}
}
return nil, errNoSuchInterface
}
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