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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 testIPv6 = flag.Bool("ipv6", false, "assume ipv6 tunnel is present")
func TestResolveGoogle(t *testing.T) {
if testing.Short() || !*testExternal {
t.Skip("skipping test to avoid external network")
}
for _, network := range []string{"tcp", "tcp4", "tcp6"} {
addr, err := ResolveTCPAddr(network, "www.google.com:http")
if err != nil {
if (network == "tcp" || network == "tcp4") && !supportsIPv4 {
t.Logf("ipv4 is not supported: %v", err)
} else if network == "tcp6" && !supportsIPv6 {
t.Logf("ipv6 is not supported: %v", err)
} else {
t.Errorf("ResolveTCPAddr failed: %v", err)
}
continue
}
if (network == "tcp" || network == "tcp4") && addr.IP.To4() == nil {
t.Errorf("got %v; expected an IPv4 address on %v", addr, network)
} else if network == "tcp6" && (addr.IP.To16() == nil || addr.IP.To4() != nil) {
t.Errorf("got %v; expected an IPv6 address on %v", addr, network)
}
}
}
func TestDialGoogle(t *testing.T) {
if testing.Short() || !*testExternal {
t.Skip("skipping test to avoid external network")
}
d := &Dialer{DualStack: true}
for _, network := range []string{"tcp", "tcp4", "tcp6"} {
if network == "tcp" && !supportsIPv4 && !supportsIPv6 {
t.Logf("skipping test; both ipv4 and ipv6 are not supported")
continue
} else if network == "tcp4" && !supportsIPv4 {
t.Logf("skipping test; ipv4 is not supported")
continue
} else if network == "tcp6" && !supportsIPv6 {
t.Logf("skipping test; ipv6 is not supported")
continue
} else if network == "tcp6" && !*testIPv6 {
t.Logf("test disabled; use -ipv6 to enable")
continue
}
if c, err := d.Dial(network, "www.google.com:http"); err != nil {
t.Errorf("Dial failed: %v", err)
} else {
c.Close()
}
}
}
// 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 /robots.txt 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 googleaddrsipv4 = []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",
}
func TestDNSThreadLimit(t *testing.T) {
if testing.Short() || !*testExternal {
t.Skip("skipping test to avoid external network")
}
const N = 10000
c := make(chan int, N)
for i := 0; i < N; i++ {
go func(i int) {
LookupIP(fmt.Sprintf("%d.net-test.golang.org", i))
c <- 1
}(i)
}
// Don't bother waiting for the stragglers; stop at 0.9 N.
for i := 0; i < N*9/10; i++ {
if i%100 == 0 {
//println("TestDNSThreadLimit:", i)
}
<-c
}
// If we're still here, it worked.
}
func TestDialGoogleIPv4(t *testing.T) {
if testing.Short() || !*testExternal {
t.Skip("skipping test to avoid external network")
}
// Insert an actual IPv4 address for google.com
// into the table.
addrs, err := LookupIP("www.google.com")
if err != nil {
t.Fatalf("lookup www.google.com: %v", err)
}
var ip IP
for _, addr := range addrs {
if x := addr.To4(); x != nil {
ip = x
break
}
}
if ip == nil {
t.Fatalf("no IPv4 addresses for www.google.com")
}
for i, s := range googleaddrsipv4 {
if strings.Contains(s, "%") {
googleaddrsipv4[i] = fmt.Sprintf(s, ip[0], ip[1], ip[2], ip[3])
}
}
for i := 0; i < len(googleaddrsipv4); i++ {
addr := googleaddrsipv4[i]
if addr == "" {
continue
}
t.Logf("-- %s --", addr)
doDial(t, "tcp", addr)
if addr[0] != '[' {
doDial(t, "tcp4", addr)
if supportsIPv6 {
// make sure syscall.SocketDisableIPv6 flag works.
syscall.SocketDisableIPv6 = true
doDial(t, "tcp", addr)
doDial(t, "tcp4", addr)
syscall.SocketDisableIPv6 = false
}
}
}
}
var googleaddrsipv6 = []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 TestDialGoogleIPv6(t *testing.T) {
if testing.Short() || !*testExternal {
t.Skip("skipping test to avoid external network")
}
// Only run tcp6 if the kernel will take it.
if !supportsIPv6 {
t.Skip("skipping test; ipv6 is not supported")
}
if !*testIPv6 {
t.Skip("test disabled; use -ipv6 to enable")
}
// Insert an actual IPv6 address for ipv6.google.com
// into the table.
addrs, err := LookupIP("ipv6.google.com")
if err != nil {
t.Fatalf("lookup ipv6.google.com: %v", err)
}
var ip IP
for _, addr := range addrs {
if x := addr.To16(); x != nil {
ip = x
break
}
}
if ip == nil {
t.Fatalf("no IPv6 addresses for ipv6.google.com")
}
for i, s := range googleaddrsipv6 {
if strings.Contains(s, "%") {
googleaddrsipv6[i] = fmt.Sprintf(s, ip[0], ip[1], ip[2], ip[3], ip[4], ip[5], ip[6], ip[7], ip[8], ip[9], ip[10], ip[11], ip[12], ip[13], ip[14], ip[15])
}
}
for i := 0; i < len(googleaddrsipv6); i++ {
addr := googleaddrsipv6[i]
if addr == "" {
continue
}
t.Logf("-- %s --", addr)
doDial(t, "tcp", addr)
doDial(t, "tcp6", addr)
}
}
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