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// Copyright 2014 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 icmp_test
import (
"errors"
"net"
"os"
"runtime"
"testing"
"golang.org/x/net/icmp"
"golang.org/x/net/internal/iana"
"golang.org/x/net/internal/nettest"
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
)
func googleAddr(c *icmp.PacketConn, protocol int) (net.Addr, error) {
const host = "www.google.com"
ips, err := net.LookupIP(host)
if err != nil {
return nil, err
}
netaddr := func(ip net.IP) (net.Addr, error) {
switch c.LocalAddr().(type) {
case *net.UDPAddr:
return &net.UDPAddr{IP: ip}, nil
case *net.IPAddr:
return &net.IPAddr{IP: ip}, nil
default:
return nil, errors.New("neither UDPAddr nor IPAddr")
}
}
for _, ip := range ips {
switch protocol {
case iana.ProtocolICMP:
if ip.To4() != nil {
return netaddr(ip)
}
case iana.ProtocolIPv6ICMP:
if ip.To16() != nil && ip.To4() == nil {
return netaddr(ip)
}
}
}
return nil, errors.New("no A or AAAA record")
}
var pingGoogleTests = []struct {
network, address string
protocol int
mtype icmp.Type
}{
{"udp4", "0.0.0.0", iana.ProtocolICMP, ipv4.ICMPTypeEcho},
{"ip4:icmp", "0.0.0.0", iana.ProtocolICMP, ipv4.ICMPTypeEcho},
{"udp6", "::", iana.ProtocolIPv6ICMP, ipv6.ICMPTypeEchoRequest},
{"ip6:ipv6-icmp", "::", iana.ProtocolIPv6ICMP, ipv6.ICMPTypeEchoRequest},
}
func TestPingGoogle(t *testing.T) {
if testing.Short() {
t.Skip("to avoid external network")
}
switch runtime.GOOS {
case "darwin":
case "linux":
t.Log("you may need to adjust the net.ipv4.ping_group_range kernel state")
default:
t.Skipf("not supported on %s", runtime.GOOS)
}
m, ok := nettest.SupportsRawIPSocket()
for i, tt := range pingGoogleTests {
if tt.network[:2] == "ip" && !ok {
t.Log(m)
continue
}
c, err := icmp.ListenPacket(tt.network, tt.address)
if err != nil {
t.Error(err)
continue
}
defer c.Close()
dst, err := googleAddr(c, tt.protocol)
if err != nil {
t.Error(err)
continue
}
wm := icmp.Message{
Type: tt.mtype, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1 << uint(i),
Data: []byte("HELLO-R-U-THERE"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
t.Error(err)
continue
}
if n, err := c.WriteTo(wb, dst); err != nil {
t.Error(err, dst)
continue
} else if n != len(wb) {
t.Errorf("got %v; want %v", n, len(wb))
continue
}
rb := make([]byte, 1500)
n, peer, err := c.ReadFrom(rb)
if err != nil {
t.Error(err)
continue
}
rm, err := icmp.ParseMessage(tt.protocol, rb[:n])
if err != nil {
t.Error(err)
continue
}
switch rm.Type {
case ipv4.ICMPTypeEchoReply, ipv6.ICMPTypeEchoReply:
t.Logf("got reflection from %v", peer)
default:
t.Errorf("got %+v; want echo reply", rm)
}
}
}
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