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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.
//go:build !js && !wasip1
package net
import (
"fmt"
"internal/testenv"
"io"
"strings"
"testing"
)
func TestResolveGoogle(t *testing.T) {
testenv.MustHaveExternalNetwork(t)
if !supportsIPv4() || !supportsIPv6() || !*testIPv4 || !*testIPv6 {
t.Skip("both IPv4 and IPv6 are required")
}
for _, network := range []string{"tcp", "tcp4", "tcp6"} {
addr, err := ResolveTCPAddr(network, "www.google.com:http")
if err != nil {
t.Error(err)
continue
}
switch {
case network == "tcp" && addr.IP.To4() == nil:
fallthrough
case network == "tcp4" && addr.IP.To4() == nil:
t.Errorf("got %v; want an IPv4 address on %s", addr, network)
case network == "tcp6" && (addr.IP.To16() == nil || addr.IP.To4() != nil):
t.Errorf("got %v; want an IPv6 address on %s", addr, network)
}
}
}
var dialGoogleTests = []struct {
dial func(string, string) (Conn, error)
unreachableNetwork string
networks []string
addrs []string
}{
{
dial: (&Dialer{DualStack: true}).Dial,
networks: []string{"tcp", "tcp4", "tcp6"},
addrs: []string{"www.google.com:http"},
},
{
dial: Dial,
unreachableNetwork: "tcp6",
networks: []string{"tcp", "tcp4"},
},
{
dial: Dial,
unreachableNetwork: "tcp4",
networks: []string{"tcp", "tcp6"},
},
}
func TestDialGoogle(t *testing.T) {
testenv.MustHaveExternalNetwork(t)
if !supportsIPv4() || !supportsIPv6() || !*testIPv4 || !*testIPv6 {
t.Skip("both IPv4 and IPv6 are required")
}
var err error
dialGoogleTests[1].addrs, dialGoogleTests[2].addrs, err = googleLiteralAddrs()
if err != nil {
t.Error(err)
}
for _, tt := range dialGoogleTests {
for _, network := range tt.networks {
disableSocketConnect(tt.unreachableNetwork)
for _, addr := range tt.addrs {
if err := fetchGoogle(tt.dial, network, addr); err != nil {
t.Error(err)
}
}
enableSocketConnect()
}
}
}
var (
literalAddrs4 = [...]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::ffff:%d.%d.%d.%d]:80",
}
literalAddrs6 = [...]string{
"[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]:80",
"ipv6.google.com:80",
"[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]:http",
"ipv6.google.com:http",
}
)
func googleLiteralAddrs() (lits4, lits6 []string, err error) {
ips, err := LookupIP("www.google.com")
if err != nil {
return nil, nil, err
}
if len(ips) == 0 {
return nil, nil, nil
}
var ip4, ip6 IP
for _, ip := range ips {
if ip4 == nil && ip.To4() != nil {
ip4 = ip.To4()
}
if ip6 == nil && ip.To16() != nil && ip.To4() == nil {
ip6 = ip.To16()
}
if ip4 != nil && ip6 != nil {
break
}
}
if ip4 != nil {
for i, lit4 := range literalAddrs4 {
if strings.Contains(lit4, "%") {
literalAddrs4[i] = fmt.Sprintf(lit4, ip4[0], ip4[1], ip4[2], ip4[3])
}
}
lits4 = literalAddrs4[:]
}
if ip6 != nil {
for i, lit6 := range literalAddrs6 {
if strings.Contains(lit6, "%") {
literalAddrs6[i] = fmt.Sprintf(lit6, ip6[0], ip6[1], ip6[2], ip6[3], ip6[4], ip6[5], ip6[6], ip6[7], ip6[8], ip6[9], ip6[10], ip6[11], ip6[12], ip6[13], ip6[14], ip6[15])
}
}
lits6 = literalAddrs6[:]
}
return
}
func fetchGoogle(dial func(string, string) (Conn, error), network, address string) error {
c, err := dial(network, address)
if err != nil {
return err
}
defer c.Close()
req := []byte("GET /robots.txt HTTP/1.0\r\nHost: www.google.com\r\n\r\n")
if _, err := c.Write(req); err != nil {
return err
}
b := make([]byte, 1000)
n, err := io.ReadFull(c, b)
if err != nil {
return err
}
if n < 1000 {
return fmt.Errorf("short read from %s:%s->%s", network, c.RemoteAddr(), c.LocalAddr())
}
return nil
}
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