github.com/rafaeltorres324/go/src@v0.0.0-20210519164414-9fdf653a9838/net/external_test.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build !js
     6  
     7  package net
     8  
     9  import (
    10  	"fmt"
    11  	"internal/testenv"
    12  	"io"
    13  	"strings"
    14  	"testing"
    15  )
    16  
    17  func TestResolveGoogle(t *testing.T) {
    18  	testenv.MustHaveExternalNetwork(t)
    19  
    20  	if !supportsIPv4() || !supportsIPv6() || !*testIPv4 || !*testIPv6 {
    21  		t.Skip("both IPv4 and IPv6 are required")
    22  	}
    23  
    24  	for _, network := range []string{"tcp", "tcp4", "tcp6"} {
    25  		addr, err := ResolveTCPAddr(network, "www.google.com:http")
    26  		if err != nil {
    27  			t.Error(err)
    28  			continue
    29  		}
    30  		switch {
    31  		case network == "tcp" && addr.IP.To4() == nil:
    32  			fallthrough
    33  		case network == "tcp4" && addr.IP.To4() == nil:
    34  			t.Errorf("got %v; want an IPv4 address on %s", addr, network)
    35  		case network == "tcp6" && (addr.IP.To16() == nil || addr.IP.To4() != nil):
    36  			t.Errorf("got %v; want an IPv6 address on %s", addr, network)
    37  		}
    38  	}
    39  }
    40  
    41  var dialGoogleTests = []struct {
    42  	dial               func(string, string) (Conn, error)
    43  	unreachableNetwork string
    44  	networks           []string
    45  	addrs              []string
    46  }{
    47  	{
    48  		dial:     (&Dialer{DualStack: true}).Dial,
    49  		networks: []string{"tcp", "tcp4", "tcp6"},
    50  		addrs:    []string{"www.google.com:http"},
    51  	},
    52  	{
    53  		dial:               Dial,
    54  		unreachableNetwork: "tcp6",
    55  		networks:           []string{"tcp", "tcp4"},
    56  	},
    57  	{
    58  		dial:               Dial,
    59  		unreachableNetwork: "tcp4",
    60  		networks:           []string{"tcp", "tcp6"},
    61  	},
    62  }
    63  
    64  func TestDialGoogle(t *testing.T) {
    65  	testenv.MustHaveExternalNetwork(t)
    66  
    67  	if !supportsIPv4() || !supportsIPv6() || !*testIPv4 || !*testIPv6 {
    68  		t.Skip("both IPv4 and IPv6 are required")
    69  	}
    70  
    71  	var err error
    72  	dialGoogleTests[1].addrs, dialGoogleTests[2].addrs, err = googleLiteralAddrs()
    73  	if err != nil {
    74  		t.Error(err)
    75  	}
    76  	for _, tt := range dialGoogleTests {
    77  		for _, network := range tt.networks {
    78  			disableSocketConnect(tt.unreachableNetwork)
    79  			for _, addr := range tt.addrs {
    80  				if err := fetchGoogle(tt.dial, network, addr); err != nil {
    81  					t.Error(err)
    82  				}
    83  			}
    84  			enableSocketConnect()
    85  		}
    86  	}
    87  }
    88  
    89  var (
    90  	literalAddrs4 = [...]string{
    91  		"%d.%d.%d.%d:80",
    92  		"www.google.com:80",
    93  		"%d.%d.%d.%d:http",
    94  		"www.google.com:http",
    95  		"%03d.%03d.%03d.%03d:0080",
    96  		"[::ffff:%d.%d.%d.%d]:80",
    97  		"[::ffff:%02x%02x:%02x%02x]:80",
    98  		"[0:0:0:0:0000:ffff:%d.%d.%d.%d]:80",
    99  		"[0:0:0:0:000000:ffff:%d.%d.%d.%d]:80",
   100  		"[0:0:0:0::ffff:%d.%d.%d.%d]:80",
   101  	}
   102  	literalAddrs6 = [...]string{
   103  		"[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]:80",
   104  		"ipv6.google.com:80",
   105  		"[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]:http",
   106  		"ipv6.google.com:http",
   107  	}
   108  )
   109  
   110  func googleLiteralAddrs() (lits4, lits6 []string, err error) {
   111  	ips, err := LookupIP("www.google.com")
   112  	if err != nil {
   113  		return nil, nil, err
   114  	}
   115  	if len(ips) == 0 {
   116  		return nil, nil, nil
   117  	}
   118  	var ip4, ip6 IP
   119  	for _, ip := range ips {
   120  		if ip4 == nil && ip.To4() != nil {
   121  			ip4 = ip.To4()
   122  		}
   123  		if ip6 == nil && ip.To16() != nil && ip.To4() == nil {
   124  			ip6 = ip.To16()
   125  		}
   126  		if ip4 != nil && ip6 != nil {
   127  			break
   128  		}
   129  	}
   130  	if ip4 != nil {
   131  		for i, lit4 := range literalAddrs4 {
   132  			if strings.Contains(lit4, "%") {
   133  				literalAddrs4[i] = fmt.Sprintf(lit4, ip4[0], ip4[1], ip4[2], ip4[3])
   134  			}
   135  		}
   136  		lits4 = literalAddrs4[:]
   137  	}
   138  	if ip6 != nil {
   139  		for i, lit6 := range literalAddrs6 {
   140  			if strings.Contains(lit6, "%") {
   141  				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])
   142  			}
   143  		}
   144  		lits6 = literalAddrs6[:]
   145  	}
   146  	return
   147  }
   148  
   149  func fetchGoogle(dial func(string, string) (Conn, error), network, address string) error {
   150  	c, err := dial(network, address)
   151  	if err != nil {
   152  		return err
   153  	}
   154  	defer c.Close()
   155  	req := []byte("GET /robots.txt HTTP/1.0\r\nHost: www.google.com\r\n\r\n")
   156  	if _, err := c.Write(req); err != nil {
   157  		return err
   158  	}
   159  	b := make([]byte, 1000)
   160  	n, err := io.ReadFull(c, b)
   161  	if err != nil {
   162  		return err
   163  	}
   164  	if n < 1000 {
   165  		return fmt.Errorf("short read from %s:%s->%s", network, c.RemoteAddr(), c.LocalAddr())
   166  	}
   167  	return nil
   168  }