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Source file src/net/ip_test.go

Documentation: net

     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  	"bytes"
    11  	"math/rand"
    12  	"reflect"
    13  	"runtime"
    14  	"testing"
    15  )
    16  
    17  var parseIPTests = []struct {
    18  	in  string
    19  	out IP
    20  }{
    21  	{"127.0.1.2", IPv4(127, 0, 1, 2)},
    22  	{"127.0.0.1", IPv4(127, 0, 0, 1)},
    23  	{"127.001.002.003", IPv4(127, 1, 2, 3)},
    24  	{"::ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
    25  	{"::ffff:127.001.002.003", IPv4(127, 1, 2, 3)},
    26  	{"::ffff:7f01:0203", IPv4(127, 1, 2, 3)},
    27  	{"0:0:0:0:0000:ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
    28  	{"0:0:0:0:000000:ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
    29  	{"0:0:0:0::ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
    30  
    31  	{"2001:4860:0:2001::68", IP{0x20, 0x01, 0x48, 0x60, 0, 0, 0x20, 0x01, 0, 0, 0, 0, 0, 0, 0x00, 0x68}},
    32  	{"2001:4860:0000:2001:0000:0000:0000:0068", IP{0x20, 0x01, 0x48, 0x60, 0, 0, 0x20, 0x01, 0, 0, 0, 0, 0, 0, 0x00, 0x68}},
    33  
    34  	{"-0.0.0.0", nil},
    35  	{"0.-1.0.0", nil},
    36  	{"0.0.-2.0", nil},
    37  	{"0.0.0.-3", nil},
    38  	{"127.0.0.256", nil},
    39  	{"abc", nil},
    40  	{"123:", nil},
    41  	{"fe80::1%lo0", nil},
    42  	{"fe80::1%911", nil},
    43  	{"", nil},
    44  	{"a1:a2:a3:a4::b1:b2:b3:b4", nil}, // Issue 6628
    45  }
    46  
    47  func TestParseIP(t *testing.T) {
    48  	for _, tt := range parseIPTests {
    49  		if out := ParseIP(tt.in); !reflect.DeepEqual(out, tt.out) {
    50  			t.Errorf("ParseIP(%q) = %v, want %v", tt.in, out, tt.out)
    51  		}
    52  		if tt.in == "" {
    53  			// Tested in TestMarshalEmptyIP below.
    54  			continue
    55  		}
    56  		var out IP
    57  		if err := out.UnmarshalText([]byte(tt.in)); !reflect.DeepEqual(out, tt.out) || (tt.out == nil) != (err != nil) {
    58  			t.Errorf("IP.UnmarshalText(%q) = %v, %v, want %v", tt.in, out, err, tt.out)
    59  		}
    60  	}
    61  }
    62  
    63  func TestLookupWithIP(t *testing.T) {
    64  	_, err := LookupIP("")
    65  	if err == nil {
    66  		t.Errorf(`LookupIP("") succeeded, should fail`)
    67  	}
    68  	_, err = LookupHost("")
    69  	if err == nil {
    70  		t.Errorf(`LookupIP("") succeeded, should fail`)
    71  	}
    72  
    73  	// Test that LookupHost and LookupIP, which normally
    74  	// expect host names, work with IP addresses.
    75  	for _, tt := range parseIPTests {
    76  		if tt.out != nil {
    77  			addrs, err := LookupHost(tt.in)
    78  			if len(addrs) != 1 || addrs[0] != tt.in || err != nil {
    79  				t.Errorf("LookupHost(%q) = %v, %v, want %v, nil", tt.in, addrs, err, []string{tt.in})
    80  			}
    81  		} else if !testing.Short() {
    82  			// We can't control what the host resolver does; if it can resolve, say,
    83  			// 127.0.0.256 or fe80::1%911 or a host named 'abc', who are we to judge?
    84  			// Warn about these discrepancies but don't fail the test.
    85  			addrs, err := LookupHost(tt.in)
    86  			if err == nil {
    87  				t.Logf("warning: LookupHost(%q) = %v, want error", tt.in, addrs)
    88  			}
    89  		}
    90  
    91  		if tt.out != nil {
    92  			ips, err := LookupIP(tt.in)
    93  			if len(ips) != 1 || !reflect.DeepEqual(ips[0], tt.out) || err != nil {
    94  				t.Errorf("LookupIP(%q) = %v, %v, want %v, nil", tt.in, ips, err, []IP{tt.out})
    95  			}
    96  		} else if !testing.Short() {
    97  			ips, err := LookupIP(tt.in)
    98  			// We can't control what the host resolver does. See above.
    99  			if err == nil {
   100  				t.Logf("warning: LookupIP(%q) = %v, want error", tt.in, ips)
   101  			}
   102  		}
   103  	}
   104  }
   105  
   106  func BenchmarkParseIP(b *testing.B) {
   107  	testHookUninstaller.Do(uninstallTestHooks)
   108  
   109  	for i := 0; i < b.N; i++ {
   110  		for _, tt := range parseIPTests {
   111  			ParseIP(tt.in)
   112  		}
   113  	}
   114  }
   115  
   116  // Issue 6339
   117  func TestMarshalEmptyIP(t *testing.T) {
   118  	for _, in := range [][]byte{nil, []byte("")} {
   119  		var out = IP{1, 2, 3, 4}
   120  		if err := out.UnmarshalText(in); err != nil || out != nil {
   121  			t.Errorf("UnmarshalText(%v) = %v, %v; want nil, nil", in, out, err)
   122  		}
   123  	}
   124  	var ip IP
   125  	got, err := ip.MarshalText()
   126  	if err != nil {
   127  		t.Fatal(err)
   128  	}
   129  	if !reflect.DeepEqual(got, []byte("")) {
   130  		t.Errorf(`got %#v, want []byte("")`, got)
   131  	}
   132  }
   133  
   134  var ipStringTests = []*struct {
   135  	in  IP     // see RFC 791 and RFC 4291
   136  	str string // see RFC 791, RFC 4291 and RFC 5952
   137  	byt []byte
   138  	error
   139  }{
   140  	// IPv4 address
   141  	{
   142  		IP{192, 0, 2, 1},
   143  		"192.0.2.1",
   144  		[]byte("192.0.2.1"),
   145  		nil,
   146  	},
   147  	{
   148  		IP{0, 0, 0, 0},
   149  		"0.0.0.0",
   150  		[]byte("0.0.0.0"),
   151  		nil,
   152  	},
   153  
   154  	// IPv4-mapped IPv6 address
   155  	{
   156  		IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 192, 0, 2, 1},
   157  		"192.0.2.1",
   158  		[]byte("192.0.2.1"),
   159  		nil,
   160  	},
   161  	{
   162  		IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 0, 0, 0},
   163  		"0.0.0.0",
   164  		[]byte("0.0.0.0"),
   165  		nil,
   166  	},
   167  
   168  	// IPv6 address
   169  	{
   170  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1},
   171  		"2001:db8::123:12:1",
   172  		[]byte("2001:db8::123:12:1"),
   173  		nil,
   174  	},
   175  	{
   176  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1},
   177  		"2001:db8::1",
   178  		[]byte("2001:db8::1"),
   179  		nil,
   180  	},
   181  	{
   182  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1},
   183  		"2001:db8:0:1:0:1:0:1",
   184  		[]byte("2001:db8:0:1:0:1:0:1"),
   185  		nil,
   186  	},
   187  	{
   188  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0},
   189  		"2001:db8:1:0:1:0:1:0",
   190  		[]byte("2001:db8:1:0:1:0:1:0"),
   191  		nil,
   192  	},
   193  	{
   194  		IP{0x20, 0x1, 0, 0, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
   195  		"2001::1:0:0:1",
   196  		[]byte("2001::1:0:0:1"),
   197  		nil,
   198  	},
   199  	{
   200  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0},
   201  		"2001:db8:0:0:1::",
   202  		[]byte("2001:db8:0:0:1::"),
   203  		nil,
   204  	},
   205  	{
   206  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
   207  		"2001:db8::1:0:0:1",
   208  		[]byte("2001:db8::1:0:0:1"),
   209  		nil,
   210  	},
   211  	{
   212  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0xa, 0, 0xb, 0, 0xc, 0, 0xd},
   213  		"2001:db8::a:b:c:d",
   214  		[]byte("2001:db8::a:b:c:d"),
   215  		nil,
   216  	},
   217  	{
   218  		IPv6unspecified,
   219  		"::",
   220  		[]byte("::"),
   221  		nil,
   222  	},
   223  
   224  	// IP wildcard equivalent address in Dial/Listen API
   225  	{
   226  		nil,
   227  		"<nil>",
   228  		nil,
   229  		nil,
   230  	},
   231  
   232  	// Opaque byte sequence
   233  	{
   234  		IP{0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef},
   235  		"?0123456789abcdef",
   236  		nil,
   237  		&AddrError{Err: "invalid IP address", Addr: "0123456789abcdef"},
   238  	},
   239  }
   240  
   241  func TestIPString(t *testing.T) {
   242  	for _, tt := range ipStringTests {
   243  		if out := tt.in.String(); out != tt.str {
   244  			t.Errorf("IP.String(%v) = %q, want %q", tt.in, out, tt.str)
   245  		}
   246  		if out, err := tt.in.MarshalText(); !bytes.Equal(out, tt.byt) || !reflect.DeepEqual(err, tt.error) {
   247  			t.Errorf("IP.MarshalText(%v) = %v, %v, want %v, %v", tt.in, out, err, tt.byt, tt.error)
   248  		}
   249  	}
   250  }
   251  
   252  var sink string
   253  
   254  func BenchmarkIPString(b *testing.B) {
   255  	testHookUninstaller.Do(uninstallTestHooks)
   256  
   257  	b.Run("IPv4", func(b *testing.B) {
   258  		benchmarkIPString(b, IPv4len)
   259  	})
   260  
   261  	b.Run("IPv6", func(b *testing.B) {
   262  		benchmarkIPString(b, IPv6len)
   263  	})
   264  }
   265  
   266  func benchmarkIPString(b *testing.B, size int) {
   267  	b.ReportAllocs()
   268  	b.ResetTimer()
   269  	for i := 0; i < b.N; i++ {
   270  		for _, tt := range ipStringTests {
   271  			if tt.in != nil && len(tt.in) == size {
   272  				sink = tt.in.String()
   273  			}
   274  		}
   275  	}
   276  }
   277  
   278  var ipMaskTests = []struct {
   279  	in   IP
   280  	mask IPMask
   281  	out  IP
   282  }{
   283  	{IPv4(192, 168, 1, 127), IPv4Mask(255, 255, 255, 128), IPv4(192, 168, 1, 0)},
   284  	{IPv4(192, 168, 1, 127), IPMask(ParseIP("255.255.255.192")), IPv4(192, 168, 1, 64)},
   285  	{IPv4(192, 168, 1, 127), IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffe0")), IPv4(192, 168, 1, 96)},
   286  	{IPv4(192, 168, 1, 127), IPv4Mask(255, 0, 255, 0), IPv4(192, 0, 1, 0)},
   287  	{ParseIP("2001:db8::1"), IPMask(ParseIP("ffff:ff80::")), ParseIP("2001:d80::")},
   288  	{ParseIP("2001:db8::1"), IPMask(ParseIP("f0f0:0f0f::")), ParseIP("2000:d08::")},
   289  }
   290  
   291  func TestIPMask(t *testing.T) {
   292  	for _, tt := range ipMaskTests {
   293  		if out := tt.in.Mask(tt.mask); out == nil || !tt.out.Equal(out) {
   294  			t.Errorf("IP(%v).Mask(%v) = %v, want %v", tt.in, tt.mask, out, tt.out)
   295  		}
   296  	}
   297  }
   298  
   299  var ipMaskStringTests = []struct {
   300  	in  IPMask
   301  	out string
   302  }{
   303  	{IPv4Mask(255, 255, 255, 240), "fffffff0"},
   304  	{IPv4Mask(255, 0, 128, 0), "ff008000"},
   305  	{IPMask(ParseIP("ffff:ff80::")), "ffffff80000000000000000000000000"},
   306  	{IPMask(ParseIP("ef00:ff80::cafe:0")), "ef00ff800000000000000000cafe0000"},
   307  	{nil, "<nil>"},
   308  }
   309  
   310  func TestIPMaskString(t *testing.T) {
   311  	for _, tt := range ipMaskStringTests {
   312  		if out := tt.in.String(); out != tt.out {
   313  			t.Errorf("IPMask.String(%v) = %q, want %q", tt.in, out, tt.out)
   314  		}
   315  	}
   316  }
   317  
   318  func BenchmarkIPMaskString(b *testing.B) {
   319  	testHookUninstaller.Do(uninstallTestHooks)
   320  
   321  	for i := 0; i < b.N; i++ {
   322  		for _, tt := range ipMaskStringTests {
   323  			sink = tt.in.String()
   324  		}
   325  	}
   326  }
   327  
   328  var parseCIDRTests = []struct {
   329  	in  string
   330  	ip  IP
   331  	net *IPNet
   332  	err error
   333  }{
   334  	{"135.104.0.0/32", IPv4(135, 104, 0, 0), &IPNet{IP: IPv4(135, 104, 0, 0), Mask: IPv4Mask(255, 255, 255, 255)}, nil},
   335  	{"0.0.0.0/24", IPv4(0, 0, 0, 0), &IPNet{IP: IPv4(0, 0, 0, 0), Mask: IPv4Mask(255, 255, 255, 0)}, nil},
   336  	{"135.104.0.0/24", IPv4(135, 104, 0, 0), &IPNet{IP: IPv4(135, 104, 0, 0), Mask: IPv4Mask(255, 255, 255, 0)}, nil},
   337  	{"135.104.0.1/32", IPv4(135, 104, 0, 1), &IPNet{IP: IPv4(135, 104, 0, 1), Mask: IPv4Mask(255, 255, 255, 255)}, nil},
   338  	{"135.104.0.1/24", IPv4(135, 104, 0, 1), &IPNet{IP: IPv4(135, 104, 0, 0), Mask: IPv4Mask(255, 255, 255, 0)}, nil},
   339  	{"::1/128", ParseIP("::1"), &IPNet{IP: ParseIP("::1"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"))}, nil},
   340  	{"abcd:2345::/127", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe"))}, nil},
   341  	{"abcd:2345::/65", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff:8000::"))}, nil},
   342  	{"abcd:2345::/64", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff::"))}, nil},
   343  	{"abcd:2345::/63", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:fffe::"))}, nil},
   344  	{"abcd:2345::/33", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:8000::"))}, nil},
   345  	{"abcd:2345::/32", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff::"))}, nil},
   346  	{"abcd:2344::/31", ParseIP("abcd:2344::"), &IPNet{IP: ParseIP("abcd:2344::"), Mask: IPMask(ParseIP("ffff:fffe::"))}, nil},
   347  	{"abcd:2300::/24", ParseIP("abcd:2300::"), &IPNet{IP: ParseIP("abcd:2300::"), Mask: IPMask(ParseIP("ffff:ff00::"))}, nil},
   348  	{"abcd:2345::/24", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2300::"), Mask: IPMask(ParseIP("ffff:ff00::"))}, nil},
   349  	{"2001:DB8::/48", ParseIP("2001:DB8::"), &IPNet{IP: ParseIP("2001:DB8::"), Mask: IPMask(ParseIP("ffff:ffff:ffff::"))}, nil},
   350  	{"2001:DB8::1/48", ParseIP("2001:DB8::1"), &IPNet{IP: ParseIP("2001:DB8::"), Mask: IPMask(ParseIP("ffff:ffff:ffff::"))}, nil},
   351  	{"192.168.1.1/255.255.255.0", nil, nil, &ParseError{Type: "CIDR address", Text: "192.168.1.1/255.255.255.0"}},
   352  	{"192.168.1.1/35", nil, nil, &ParseError{Type: "CIDR address", Text: "192.168.1.1/35"}},
   353  	{"2001:db8::1/-1", nil, nil, &ParseError{Type: "CIDR address", Text: "2001:db8::1/-1"}},
   354  	{"2001:db8::1/-0", nil, nil, &ParseError{Type: "CIDR address", Text: "2001:db8::1/-0"}},
   355  	{"-0.0.0.0/32", nil, nil, &ParseError{Type: "CIDR address", Text: "-0.0.0.0/32"}},
   356  	{"0.-1.0.0/32", nil, nil, &ParseError{Type: "CIDR address", Text: "0.-1.0.0/32"}},
   357  	{"0.0.-2.0/32", nil, nil, &ParseError{Type: "CIDR address", Text: "0.0.-2.0/32"}},
   358  	{"0.0.0.-3/32", nil, nil, &ParseError{Type: "CIDR address", Text: "0.0.0.-3/32"}},
   359  	{"0.0.0.0/-0", nil, nil, &ParseError{Type: "CIDR address", Text: "0.0.0.0/-0"}},
   360  	{"", nil, nil, &ParseError{Type: "CIDR address", Text: ""}},
   361  }
   362  
   363  func TestParseCIDR(t *testing.T) {
   364  	for _, tt := range parseCIDRTests {
   365  		ip, net, err := ParseCIDR(tt.in)
   366  		if !reflect.DeepEqual(err, tt.err) {
   367  			t.Errorf("ParseCIDR(%q) = %v, %v; want %v, %v", tt.in, ip, net, tt.ip, tt.net)
   368  		}
   369  		if err == nil && (!tt.ip.Equal(ip) || !tt.net.IP.Equal(net.IP) || !reflect.DeepEqual(net.Mask, tt.net.Mask)) {
   370  			t.Errorf("ParseCIDR(%q) = %v, {%v, %v}; want %v, {%v, %v}", tt.in, ip, net.IP, net.Mask, tt.ip, tt.net.IP, tt.net.Mask)
   371  		}
   372  	}
   373  }
   374  
   375  var ipNetContainsTests = []struct {
   376  	ip  IP
   377  	net *IPNet
   378  	ok  bool
   379  }{
   380  	{IPv4(172, 16, 1, 1), &IPNet{IP: IPv4(172, 16, 0, 0), Mask: CIDRMask(12, 32)}, true},
   381  	{IPv4(172, 24, 0, 1), &IPNet{IP: IPv4(172, 16, 0, 0), Mask: CIDRMask(13, 32)}, false},
   382  	{IPv4(192, 168, 0, 3), &IPNet{IP: IPv4(192, 168, 0, 0), Mask: IPv4Mask(0, 0, 255, 252)}, true},
   383  	{IPv4(192, 168, 0, 4), &IPNet{IP: IPv4(192, 168, 0, 0), Mask: IPv4Mask(0, 255, 0, 252)}, false},
   384  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:1::"), Mask: CIDRMask(47, 128)}, true},
   385  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:2::"), Mask: CIDRMask(47, 128)}, false},
   386  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:1::"), Mask: IPMask(ParseIP("ffff:0:ffff::"))}, true},
   387  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:1::"), Mask: IPMask(ParseIP("0:0:0:ffff::"))}, false},
   388  }
   389  
   390  func TestIPNetContains(t *testing.T) {
   391  	for _, tt := range ipNetContainsTests {
   392  		if ok := tt.net.Contains(tt.ip); ok != tt.ok {
   393  			t.Errorf("IPNet(%v).Contains(%v) = %v, want %v", tt.net, tt.ip, ok, tt.ok)
   394  		}
   395  	}
   396  }
   397  
   398  var ipNetStringTests = []struct {
   399  	in  *IPNet
   400  	out string
   401  }{
   402  	{&IPNet{IP: IPv4(192, 168, 1, 0), Mask: CIDRMask(26, 32)}, "192.168.1.0/26"},
   403  	{&IPNet{IP: IPv4(192, 168, 1, 0), Mask: IPv4Mask(255, 0, 255, 0)}, "192.168.1.0/ff00ff00"},
   404  	{&IPNet{IP: ParseIP("2001:db8::"), Mask: CIDRMask(55, 128)}, "2001:db8::/55"},
   405  	{&IPNet{IP: ParseIP("2001:db8::"), Mask: IPMask(ParseIP("8000:f123:0:cafe::"))}, "2001:db8::/8000f1230000cafe0000000000000000"},
   406  }
   407  
   408  func TestIPNetString(t *testing.T) {
   409  	for _, tt := range ipNetStringTests {
   410  		if out := tt.in.String(); out != tt.out {
   411  			t.Errorf("IPNet.String(%v) = %q, want %q", tt.in, out, tt.out)
   412  		}
   413  	}
   414  }
   415  
   416  var cidrMaskTests = []struct {
   417  	ones int
   418  	bits int
   419  	out  IPMask
   420  }{
   421  	{0, 32, IPv4Mask(0, 0, 0, 0)},
   422  	{12, 32, IPv4Mask(255, 240, 0, 0)},
   423  	{24, 32, IPv4Mask(255, 255, 255, 0)},
   424  	{32, 32, IPv4Mask(255, 255, 255, 255)},
   425  	{0, 128, IPMask{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
   426  	{4, 128, IPMask{0xf0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
   427  	{48, 128, IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
   428  	{128, 128, IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}},
   429  	{33, 32, nil},
   430  	{32, 33, nil},
   431  	{-1, 128, nil},
   432  	{128, -1, nil},
   433  }
   434  
   435  func TestCIDRMask(t *testing.T) {
   436  	for _, tt := range cidrMaskTests {
   437  		if out := CIDRMask(tt.ones, tt.bits); !reflect.DeepEqual(out, tt.out) {
   438  			t.Errorf("CIDRMask(%v, %v) = %v, want %v", tt.ones, tt.bits, out, tt.out)
   439  		}
   440  	}
   441  }
   442  
   443  var (
   444  	v4addr         = IP{192, 168, 0, 1}
   445  	v4mappedv6addr = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 192, 168, 0, 1}
   446  	v6addr         = IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1}
   447  	v4mask         = IPMask{255, 255, 255, 0}
   448  	v4mappedv6mask = IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 255, 255, 255, 0}
   449  	v6mask         = IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0, 0}
   450  	badaddr        = IP{192, 168, 0}
   451  	badmask        = IPMask{255, 255, 0}
   452  	v4maskzero     = IPMask{0, 0, 0, 0}
   453  )
   454  
   455  var networkNumberAndMaskTests = []struct {
   456  	in  IPNet
   457  	out IPNet
   458  }{
   459  	{IPNet{IP: v4addr, Mask: v4mask}, IPNet{IP: v4addr, Mask: v4mask}},
   460  	{IPNet{IP: v4addr, Mask: v4mappedv6mask}, IPNet{IP: v4addr, Mask: v4mask}},
   461  	{IPNet{IP: v4mappedv6addr, Mask: v4mappedv6mask}, IPNet{IP: v4addr, Mask: v4mask}},
   462  	{IPNet{IP: v4mappedv6addr, Mask: v6mask}, IPNet{IP: v4addr, Mask: v4maskzero}},
   463  	{IPNet{IP: v4addr, Mask: v6mask}, IPNet{IP: v4addr, Mask: v4maskzero}},
   464  	{IPNet{IP: v6addr, Mask: v6mask}, IPNet{IP: v6addr, Mask: v6mask}},
   465  	{IPNet{IP: v6addr, Mask: v4mappedv6mask}, IPNet{IP: v6addr, Mask: v4mappedv6mask}},
   466  	{in: IPNet{IP: v6addr, Mask: v4mask}},
   467  	{in: IPNet{IP: v4addr, Mask: badmask}},
   468  	{in: IPNet{IP: v4mappedv6addr, Mask: badmask}},
   469  	{in: IPNet{IP: v6addr, Mask: badmask}},
   470  	{in: IPNet{IP: badaddr, Mask: v4mask}},
   471  	{in: IPNet{IP: badaddr, Mask: v4mappedv6mask}},
   472  	{in: IPNet{IP: badaddr, Mask: v6mask}},
   473  	{in: IPNet{IP: badaddr, Mask: badmask}},
   474  }
   475  
   476  func TestNetworkNumberAndMask(t *testing.T) {
   477  	for _, tt := range networkNumberAndMaskTests {
   478  		ip, m := networkNumberAndMask(&tt.in)
   479  		out := &IPNet{IP: ip, Mask: m}
   480  		if !reflect.DeepEqual(&tt.out, out) {
   481  			t.Errorf("networkNumberAndMask(%v) = %v, want %v", tt.in, out, &tt.out)
   482  		}
   483  	}
   484  }
   485  
   486  func TestSplitHostPort(t *testing.T) {
   487  	for _, tt := range []struct {
   488  		hostPort string
   489  		host     string
   490  		port     string
   491  	}{
   492  		// Host name
   493  		{"localhost:http", "localhost", "http"},
   494  		{"localhost:80", "localhost", "80"},
   495  
   496  		// Go-specific host name with zone identifier
   497  		{"localhost%lo0:http", "localhost%lo0", "http"},
   498  		{"localhost%lo0:80", "localhost%lo0", "80"},
   499  		{"[localhost%lo0]:http", "localhost%lo0", "http"}, // Go 1 behavior
   500  		{"[localhost%lo0]:80", "localhost%lo0", "80"},     // Go 1 behavior
   501  
   502  		// IP literal
   503  		{"127.0.0.1:http", "127.0.0.1", "http"},
   504  		{"127.0.0.1:80", "127.0.0.1", "80"},
   505  		{"[::1]:http", "::1", "http"},
   506  		{"[::1]:80", "::1", "80"},
   507  
   508  		// IP literal with zone identifier
   509  		{"[::1%lo0]:http", "::1%lo0", "http"},
   510  		{"[::1%lo0]:80", "::1%lo0", "80"},
   511  
   512  		// Go-specific wildcard for host name
   513  		{":http", "", "http"}, // Go 1 behavior
   514  		{":80", "", "80"},     // Go 1 behavior
   515  
   516  		// Go-specific wildcard for service name or transport port number
   517  		{"golang.org:", "golang.org", ""}, // Go 1 behavior
   518  		{"127.0.0.1:", "127.0.0.1", ""},   // Go 1 behavior
   519  		{"[::1]:", "::1", ""},             // Go 1 behavior
   520  
   521  		// Opaque service name
   522  		{"golang.org:https%foo", "golang.org", "https%foo"}, // Go 1 behavior
   523  	} {
   524  		if host, port, err := SplitHostPort(tt.hostPort); host != tt.host || port != tt.port || err != nil {
   525  			t.Errorf("SplitHostPort(%q) = %q, %q, %v; want %q, %q, nil", tt.hostPort, host, port, err, tt.host, tt.port)
   526  		}
   527  	}
   528  
   529  	for _, tt := range []struct {
   530  		hostPort string
   531  		err      string
   532  	}{
   533  		{"golang.org", "missing port in address"},
   534  		{"127.0.0.1", "missing port in address"},
   535  		{"[::1]", "missing port in address"},
   536  		{"[fe80::1%lo0]", "missing port in address"},
   537  		{"[localhost%lo0]", "missing port in address"},
   538  		{"localhost%lo0", "missing port in address"},
   539  
   540  		{"::1", "too many colons in address"},
   541  		{"fe80::1%lo0", "too many colons in address"},
   542  		{"fe80::1%lo0:80", "too many colons in address"},
   543  
   544  		// Test cases that didn't fail in Go 1
   545  
   546  		{"[foo:bar]", "missing port in address"},
   547  		{"[foo:bar]baz", "missing port in address"},
   548  		{"[foo]bar:baz", "missing port in address"},
   549  
   550  		{"[foo]:[bar]:baz", "too many colons in address"},
   551  
   552  		{"[foo]:[bar]baz", "unexpected '[' in address"},
   553  		{"foo[bar]:baz", "unexpected '[' in address"},
   554  
   555  		{"foo]bar:baz", "unexpected ']' in address"},
   556  	} {
   557  		if host, port, err := SplitHostPort(tt.hostPort); err == nil {
   558  			t.Errorf("SplitHostPort(%q) should have failed", tt.hostPort)
   559  		} else {
   560  			e := err.(*AddrError)
   561  			if e.Err != tt.err {
   562  				t.Errorf("SplitHostPort(%q) = _, _, %q; want %q", tt.hostPort, e.Err, tt.err)
   563  			}
   564  			if host != "" || port != "" {
   565  				t.Errorf("SplitHostPort(%q) = %q, %q, err; want %q, %q, err on failure", tt.hostPort, host, port, "", "")
   566  			}
   567  		}
   568  	}
   569  }
   570  
   571  func TestJoinHostPort(t *testing.T) {
   572  	for _, tt := range []struct {
   573  		host     string
   574  		port     string
   575  		hostPort string
   576  	}{
   577  		// Host name
   578  		{"localhost", "http", "localhost:http"},
   579  		{"localhost", "80", "localhost:80"},
   580  
   581  		// Go-specific host name with zone identifier
   582  		{"localhost%lo0", "http", "localhost%lo0:http"},
   583  		{"localhost%lo0", "80", "localhost%lo0:80"},
   584  
   585  		// IP literal
   586  		{"127.0.0.1", "http", "127.0.0.1:http"},
   587  		{"127.0.0.1", "80", "127.0.0.1:80"},
   588  		{"::1", "http", "[::1]:http"},
   589  		{"::1", "80", "[::1]:80"},
   590  
   591  		// IP literal with zone identifier
   592  		{"::1%lo0", "http", "[::1%lo0]:http"},
   593  		{"::1%lo0", "80", "[::1%lo0]:80"},
   594  
   595  		// Go-specific wildcard for host name
   596  		{"", "http", ":http"}, // Go 1 behavior
   597  		{"", "80", ":80"},     // Go 1 behavior
   598  
   599  		// Go-specific wildcard for service name or transport port number
   600  		{"golang.org", "", "golang.org:"}, // Go 1 behavior
   601  		{"127.0.0.1", "", "127.0.0.1:"},   // Go 1 behavior
   602  		{"::1", "", "[::1]:"},             // Go 1 behavior
   603  
   604  		// Opaque service name
   605  		{"golang.org", "https%foo", "golang.org:https%foo"}, // Go 1 behavior
   606  	} {
   607  		if hostPort := JoinHostPort(tt.host, tt.port); hostPort != tt.hostPort {
   608  			t.Errorf("JoinHostPort(%q, %q) = %q; want %q", tt.host, tt.port, hostPort, tt.hostPort)
   609  		}
   610  	}
   611  }
   612  
   613  var ipAddrFamilyTests = []struct {
   614  	in  IP
   615  	af4 bool
   616  	af6 bool
   617  }{
   618  	{IPv4bcast, true, false},
   619  	{IPv4allsys, true, false},
   620  	{IPv4allrouter, true, false},
   621  	{IPv4zero, true, false},
   622  	{IPv4(224, 0, 0, 1), true, false},
   623  	{IPv4(127, 0, 0, 1), true, false},
   624  	{IPv4(240, 0, 0, 1), true, false},
   625  	{IPv6unspecified, false, true},
   626  	{IPv6loopback, false, true},
   627  	{IPv6interfacelocalallnodes, false, true},
   628  	{IPv6linklocalallnodes, false, true},
   629  	{IPv6linklocalallrouters, false, true},
   630  	{ParseIP("ff05::a:b:c:d"), false, true},
   631  	{ParseIP("fe80::1:2:3:4"), false, true},
   632  	{ParseIP("2001:db8::123:12:1"), false, true},
   633  }
   634  
   635  func TestIPAddrFamily(t *testing.T) {
   636  	for _, tt := range ipAddrFamilyTests {
   637  		if af := tt.in.To4() != nil; af != tt.af4 {
   638  			t.Errorf("verifying IPv4 address family for %q = %v, want %v", tt.in, af, tt.af4)
   639  		}
   640  		if af := len(tt.in) == IPv6len && tt.in.To4() == nil; af != tt.af6 {
   641  			t.Errorf("verifying IPv6 address family for %q = %v, want %v", tt.in, af, tt.af6)
   642  		}
   643  	}
   644  }
   645  
   646  var ipAddrScopeTests = []struct {
   647  	scope func(IP) bool
   648  	in    IP
   649  	ok    bool
   650  }{
   651  	{IP.IsUnspecified, IPv4zero, true},
   652  	{IP.IsUnspecified, IPv4(127, 0, 0, 1), false},
   653  	{IP.IsUnspecified, IPv6unspecified, true},
   654  	{IP.IsUnspecified, IPv6interfacelocalallnodes, false},
   655  	{IP.IsUnspecified, nil, false},
   656  	{IP.IsLoopback, IPv4(127, 0, 0, 1), true},
   657  	{IP.IsLoopback, IPv4(127, 255, 255, 254), true},
   658  	{IP.IsLoopback, IPv4(128, 1, 2, 3), false},
   659  	{IP.IsLoopback, IPv6loopback, true},
   660  	{IP.IsLoopback, IPv6linklocalallrouters, false},
   661  	{IP.IsLoopback, nil, false},
   662  	{IP.IsMulticast, IPv4(224, 0, 0, 0), true},
   663  	{IP.IsMulticast, IPv4(239, 0, 0, 0), true},
   664  	{IP.IsMulticast, IPv4(240, 0, 0, 0), false},
   665  	{IP.IsMulticast, IPv6linklocalallnodes, true},
   666  	{IP.IsMulticast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, true},
   667  	{IP.IsMulticast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   668  	{IP.IsMulticast, nil, false},
   669  	{IP.IsInterfaceLocalMulticast, IPv4(224, 0, 0, 0), false},
   670  	{IP.IsInterfaceLocalMulticast, IPv4(0xff, 0x01, 0, 0), false},
   671  	{IP.IsInterfaceLocalMulticast, IPv6interfacelocalallnodes, true},
   672  	{IP.IsInterfaceLocalMulticast, nil, false},
   673  	{IP.IsLinkLocalMulticast, IPv4(224, 0, 0, 0), true},
   674  	{IP.IsLinkLocalMulticast, IPv4(239, 0, 0, 0), false},
   675  	{IP.IsLinkLocalMulticast, IPv4(0xff, 0x02, 0, 0), false},
   676  	{IP.IsLinkLocalMulticast, IPv6linklocalallrouters, true},
   677  	{IP.IsLinkLocalMulticast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   678  	{IP.IsLinkLocalMulticast, nil, false},
   679  	{IP.IsLinkLocalUnicast, IPv4(169, 254, 0, 0), true},
   680  	{IP.IsLinkLocalUnicast, IPv4(169, 255, 0, 0), false},
   681  	{IP.IsLinkLocalUnicast, IPv4(0xfe, 0x80, 0, 0), false},
   682  	{IP.IsLinkLocalUnicast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, true},
   683  	{IP.IsLinkLocalUnicast, IP{0xfe, 0xc0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   684  	{IP.IsLinkLocalUnicast, nil, false},
   685  	{IP.IsGlobalUnicast, IPv4(240, 0, 0, 0), true},
   686  	{IP.IsGlobalUnicast, IPv4(232, 0, 0, 0), false},
   687  	{IP.IsGlobalUnicast, IPv4(169, 254, 0, 0), false},
   688  	{IP.IsGlobalUnicast, IPv4bcast, false},
   689  	{IP.IsGlobalUnicast, IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1}, true},
   690  	{IP.IsGlobalUnicast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   691  	{IP.IsGlobalUnicast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   692  	{IP.IsGlobalUnicast, nil, false},
   693  }
   694  
   695  func name(f interface{}) string {
   696  	return runtime.FuncForPC(reflect.ValueOf(f).Pointer()).Name()
   697  }
   698  
   699  func TestIPAddrScope(t *testing.T) {
   700  	for _, tt := range ipAddrScopeTests {
   701  		if ok := tt.scope(tt.in); ok != tt.ok {
   702  			t.Errorf("%s(%q) = %v, want %v", name(tt.scope), tt.in, ok, tt.ok)
   703  		}
   704  		ip := tt.in.To4()
   705  		if ip == nil {
   706  			continue
   707  		}
   708  		if ok := tt.scope(ip); ok != tt.ok {
   709  			t.Errorf("%s(%q) = %v, want %v", name(tt.scope), ip, ok, tt.ok)
   710  		}
   711  	}
   712  }
   713  
   714  func BenchmarkIPEqual(b *testing.B) {
   715  	b.Run("IPv4", func(b *testing.B) {
   716  		benchmarkIPEqual(b, IPv4len)
   717  	})
   718  	b.Run("IPv6", func(b *testing.B) {
   719  		benchmarkIPEqual(b, IPv6len)
   720  	})
   721  }
   722  
   723  func benchmarkIPEqual(b *testing.B, size int) {
   724  	ips := make([]IP, 1000)
   725  	for i := range ips {
   726  		ips[i] = make(IP, size)
   727  		rand.Read(ips[i])
   728  	}
   729  	// Half of the N are equal.
   730  	for i := 0; i < b.N/2; i++ {
   731  		x := ips[i%len(ips)]
   732  		y := ips[i%len(ips)]
   733  		x.Equal(y)
   734  	}
   735  	// The other half are not equal.
   736  	for i := 0; i < b.N/2; i++ {
   737  		x := ips[i%len(ips)]
   738  		y := ips[(i+1)%len(ips)]
   739  		x.Equal(y)
   740  	}
   741  }
   742  

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