1 files changed, 168 insertions, 0 deletions
diff --git a/src/net/external_test.go b/src/net/external_test.go
new file mode 100644
index 0000000..3a97011
--- /dev/null
+++ b/src/net/external_test.go
@@ -0,0 +1,168 @@
+// 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
+
+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
+}