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// Copyright 2009 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 net
import (
"flag"
"fmt"
"io"
"strings"
"syscall"
"testing"
)
// If an IPv6 tunnel is running, we can try dialing a real IPv6 address.
var ipv6 = flag.Bool("ipv6", false, "assume ipv6 tunnel is present")
// fd is already connected to the destination, port 80.
// Run an HTTP request to fetch the appropriate page.
func fetchGoogle(t *testing.T, fd Conn, network, addr string) {
req := []byte("GET /intl/en/privacy/ HTTP/1.0\r\nHost: www.google.com\r\n\r\n")
n, err := fd.Write(req)
buf := make([]byte, 1000)
n, err = io.ReadFull(fd, buf)
if n < 1000 {
t.Errorf("fetchGoogle: short HTTP read from %s %s - %v", network, addr, err)
return
}
}
func doDial(t *testing.T, network, addr string) {
fd, err := Dial(network, addr)
if err != nil {
t.Errorf("Dial(%q, %q, %q) = _, %v", network, "", addr, err)
return
}
fetchGoogle(t, fd, network, addr)
fd.Close()
}
var googleaddrs = []string{
"%d.%d.%d.%d:80",
"www.google.com:80",
"%d.%d.%d.%d:http",
"www.google.com:http",
"%03d.%03d.%03d.%03d:0080",
"[::ffff:%d.%d.%d.%d]:80",
"[::ffff:%02x%02x:%02x%02x]:80",
"[0:0:0:0:0000:ffff:%d.%d.%d.%d]:80",
"[0:0:0:0:000000:ffff:%d.%d.%d.%d]:80",
"[0:0:0:0:0:ffff::%d.%d.%d.%d]:80",
"[2001:4860:0:2001::68]:80", // ipv6.google.com; removed if ipv6 flag not set
}
func TestLookupCNAME(t *testing.T) {
cname, err := LookupCNAME("www.google.com")
if cname != "www.l.google.com." || err != nil {
t.Errorf(`LookupCNAME("www.google.com.") = %q, %v, want "www.l.google.com.", nil`, cname, err)
}
}
func TestDialGoogle(t *testing.T) {
// If no ipv6 tunnel, don't try the last address.
if !*ipv6 {
googleaddrs[len(googleaddrs)-1] = ""
}
// Insert an actual IP address for google.com
// into the table.
addrs, err := LookupIP("www.google.com")
if err != nil {
t.Fatalf("lookup www.google.com: %v", err)
}
if len(addrs) == 0 {
t.Fatalf("no addresses for www.google.com")
}
ip := addrs[0].To4()
for i, s := range googleaddrs {
if strings.Contains(s, "%") {
googleaddrs[i] = fmt.Sprintf(s, ip[0], ip[1], ip[2], ip[3])
}
}
for i := 0; i < len(googleaddrs); i++ {
addr := googleaddrs[i]
if addr == "" {
continue
}
t.Logf("-- %s --", addr)
doDial(t, "tcp", addr)
if addr[0] != '[' {
doDial(t, "tcp4", addr)
if !preferIPv4 {
// make sure preferIPv4 flag works.
preferIPv4 = true
syscall.SocketDisableIPv6 = true
doDial(t, "tcp4", addr)
syscall.SocketDisableIPv6 = false
preferIPv4 = false
}
}
// Only run tcp6 if the kernel will take it.
if kernelSupportsIPv6() {
doDial(t, "tcp6", addr)
}
}
}
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