/usr/share/gocode/src/code.google.com/p/go.net/ipv4/mocktransponder_test.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 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | // 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.
// +build darwin freebsd linux netbsd openbsd
package ipv4_test
import (
"code.google.com/p/go.net/ipv4"
"net"
"testing"
"time"
)
// writeThenReadPayload transmits IPv4 datagram payloads to the
// loopback address or interface and captures the loopback'd datagram
// payloads.
func writeThenReadPayload(t *testing.T, i int, c *ipv4.PacketConn, wb []byte, dst net.Addr) []byte {
rb := make([]byte, 1500)
c.SetTOS(i + 1)
var ip net.IP
switch v := dst.(type) {
case *net.UDPAddr:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if ip.IsMulticast() {
c.SetMulticastTTL(i + 1)
} else {
c.SetTTL(i + 1)
}
c.SetDeadline(time.Now().Add(100 * time.Millisecond))
if _, err := c.WriteTo(wb, nil, dst); err != nil {
t.Fatalf("ipv4.PacketConn.WriteTo failed: %v", err)
}
n, cm, _, err := c.ReadFrom(rb)
if err != nil {
t.Fatalf("ipv4.PacketConn.ReadFrom failed: %v", err)
}
t.Logf("rcvd cmsg: %v", cm)
return rb[:n]
}
// writeThenReadDatagram transmits ICMP for IPv4 datagrams to the
// loopback address or interface and captures the response datagrams
// from the protocol stack within the kernel.
func writeThenReadDatagram(t *testing.T, i int, c *ipv4.RawConn, wb []byte, src, dst net.Addr) []byte {
rb := make([]byte, ipv4.HeaderLen+len(wb))
wh := &ipv4.Header{
Version: ipv4.Version,
Len: ipv4.HeaderLen,
TOS: i + 1,
TotalLen: ipv4.HeaderLen + len(wb),
TTL: i + 1,
Protocol: 1,
}
if src != nil {
wh.Src = src.(*net.IPAddr).IP
}
if dst != nil {
wh.Dst = dst.(*net.IPAddr).IP
}
c.SetDeadline(time.Now().Add(100 * time.Millisecond))
if err := c.WriteTo(wh, wb, nil); err != nil {
t.Fatalf("ipv4.RawConn.WriteTo failed: %v", err)
}
rh, b, cm, err := c.ReadFrom(rb)
if err != nil {
t.Fatalf("ipv4.RawConn.ReadFrom failed: %v", err)
}
t.Logf("rcvd cmsg: %v", cm.String())
t.Logf("rcvd hdr: %v", rh.String())
return b
}
// LoopbackInterface returns a logical network interface for loopback
// tests.
func loopbackInterface() *net.Interface {
ift, err := net.Interfaces()
if err != nil {
return nil
}
for _, ifi := range ift {
if ifi.Flags&net.FlagLoopback != 0 {
return &ifi
}
}
return nil
}
// isMulticastAvailable returns true if ifi is a multicast access
// enabled network interface. It also returns a unicast IPv4 address
// that can be used for listening on ifi.
func isMulticastAvailable(ifi *net.Interface) (net.IP, bool) {
if ifi.Flags&net.FlagUp == 0 || ifi.Flags&net.FlagMulticast == 0 {
return nil, false
}
ifat, err := ifi.Addrs()
if err != nil {
return nil, false
}
if len(ifat) == 0 {
return nil, false
}
var ip net.IP
for _, ifa := range ifat {
switch v := ifa.(type) {
case *net.IPAddr:
ip = v.IP
case *net.IPNet:
ip = v.IP
default:
continue
}
if ip.To4() == nil {
ip = nil
continue
}
break
}
return ip, true
}
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