Source file src/net/ip_test.go

     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  package net
     6  
     7  import (
     8  	"bytes"
     9  	"math/rand"
    10  	"reflect"
    11  	"runtime"
    12  	"testing"
    13  )
    14  
    15  var parseIPTests = []struct {
    16  	in  string
    17  	out IP
    18  }{
    19  	{"127.0.1.2", IPv4(127, 0, 1, 2)},
    20  	{"127.0.0.1", IPv4(127, 0, 0, 1)},
    21  	{"::ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
    22  	{"::ffff:7f01:0203", IPv4(127, 1, 2, 3)},
    23  	{"0:0:0:0:0000:ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
    24  	{"0:0:0:0::ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
    25  
    26  	{"2001:4860:0:2001::68", IP{0x20, 0x01, 0x48, 0x60, 0, 0, 0x20, 0x01, 0, 0, 0, 0, 0, 0, 0x00, 0x68}},
    27  	{"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}},
    28  
    29  	{"-0.0.0.0", nil},
    30  	{"0.-1.0.0", nil},
    31  	{"0.0.-2.0", nil},
    32  	{"0.0.0.-3", nil},
    33  	{"127.0.0.256", nil},
    34  	{"abc", nil},
    35  	{"123:", nil},
    36  	{"fe80::1%lo0", nil},
    37  	{"fe80::1%911", nil},
    38  	{"", nil},
    39  	//6 zeroes in one group
    40  	{"0:0:0:0:000000:ffff:127.1.2.3", nil},
    41  	//5 zeroes in one group edge case
    42  	{"0:0:0:0:00000:ffff:127.1.2.3", nil},
    43  	{"a1:a2:a3:a4::b1:b2:b3:b4", nil}, // Issue 6628
    44  	{"127.001.002.003", nil},
    45  	{"::ffff:127.001.002.003", nil},
    46  	{"123.000.000.000", nil},
    47  	{"1.2..4", nil},
    48  	{"0123.0.0.1", nil},
    49  }
    50  
    51  func TestParseIP(t *testing.T) {
    52  	for _, tt := range parseIPTests {
    53  		if out := ParseIP(tt.in); !reflect.DeepEqual(out, tt.out) {
    54  			t.Errorf("ParseIP(%q) = %v, want %v", tt.in, out, tt.out)
    55  		}
    56  		if tt.in == "" {
    57  			// Tested in TestMarshalEmptyIP below.
    58  			continue
    59  		}
    60  		var out IP
    61  		if err := out.UnmarshalText([]byte(tt.in)); !reflect.DeepEqual(out, tt.out) || (tt.out == nil) != (err != nil) {
    62  			t.Errorf("IP.UnmarshalText(%q) = %v, %v, want %v", tt.in, out, err, tt.out)
    63  		}
    64  	}
    65  }
    66  
    67  func TestLookupWithIP(t *testing.T) {
    68  	_, err := LookupIP("")
    69  	if err == nil {
    70  		t.Errorf(`LookupIP("") succeeded, should fail`)
    71  	}
    72  	_, err = LookupHost("")
    73  	if err == nil {
    74  		t.Errorf(`LookupIP("") succeeded, should fail`)
    75  	}
    76  
    77  	// Test that LookupHost and LookupIP, which normally
    78  	// expect host names, work with IP addresses.
    79  	for _, tt := range parseIPTests {
    80  		if tt.out != nil {
    81  			addrs, err := LookupHost(tt.in)
    82  			if len(addrs) != 1 || addrs[0] != tt.in || err != nil {
    83  				t.Errorf("LookupHost(%q) = %v, %v, want %v, nil", tt.in, addrs, err, []string{tt.in})
    84  			}
    85  		} else if !testing.Short() {
    86  			// We can't control what the host resolver does; if it can resolve, say,
    87  			// 127.0.0.256 or fe80::1%911 or a host named 'abc', who are we to judge?
    88  			// Warn about these discrepancies but don't fail the test.
    89  			addrs, err := LookupHost(tt.in)
    90  			if err == nil {
    91  				t.Logf("warning: LookupHost(%q) = %v, want error", tt.in, addrs)
    92  			}
    93  		}
    94  
    95  		if tt.out != nil {
    96  			ips, err := LookupIP(tt.in)
    97  			if len(ips) != 1 || !reflect.DeepEqual(ips[0], tt.out) || err != nil {
    98  				t.Errorf("LookupIP(%q) = %v, %v, want %v, nil", tt.in, ips, err, []IP{tt.out})
    99  			}
   100  		} else if !testing.Short() {
   101  			ips, err := LookupIP(tt.in)
   102  			// We can't control what the host resolver does. See above.
   103  			if err == nil {
   104  				t.Logf("warning: LookupIP(%q) = %v, want error", tt.in, ips)
   105  			}
   106  		}
   107  	}
   108  }
   109  
   110  func BenchmarkParseIP(b *testing.B) {
   111  	testHookUninstaller.Do(uninstallTestHooks)
   112  
   113  	for i := 0; i < b.N; i++ {
   114  		for _, tt := range parseIPTests {
   115  			ParseIP(tt.in)
   116  		}
   117  	}
   118  }
   119  
   120  func BenchmarkParseIPValidIPv4(b *testing.B) {
   121  	testHookUninstaller.Do(uninstallTestHooks)
   122  
   123  	for i := 0; i < b.N; i++ {
   124  		ParseIP("192.0.2.1")
   125  	}
   126  }
   127  
   128  func BenchmarkParseIPValidIPv6(b *testing.B) {
   129  	testHookUninstaller.Do(uninstallTestHooks)
   130  
   131  	for i := 0; i < b.N; i++ {
   132  		ParseIP("2001:DB8::1")
   133  	}
   134  }
   135  
   136  // Issue 6339
   137  func TestMarshalEmptyIP(t *testing.T) {
   138  	for _, in := range [][]byte{nil, []byte("")} {
   139  		var out = IP{1, 2, 3, 4}
   140  		if err := out.UnmarshalText(in); err != nil || out != nil {
   141  			t.Errorf("UnmarshalText(%v) = %v, %v; want nil, nil", in, out, err)
   142  		}
   143  	}
   144  	var ip IP
   145  	got, err := ip.MarshalText()
   146  	if err != nil {
   147  		t.Fatal(err)
   148  	}
   149  	if !reflect.DeepEqual(got, []byte("")) {
   150  		t.Errorf(`got %#v, want []byte("")`, got)
   151  	}
   152  }
   153  
   154  var ipStringTests = []*struct {
   155  	in  IP     // see RFC 791 and RFC 4291
   156  	str string // see RFC 791, RFC 4291 and RFC 5952
   157  	byt []byte
   158  	error
   159  }{
   160  	// IPv4 address
   161  	{
   162  		IP{192, 0, 2, 1},
   163  		"192.0.2.1",
   164  		[]byte("192.0.2.1"),
   165  		nil,
   166  	},
   167  	{
   168  		IP{0, 0, 0, 0},
   169  		"0.0.0.0",
   170  		[]byte("0.0.0.0"),
   171  		nil,
   172  	},
   173  
   174  	// IPv4-mapped IPv6 address
   175  	{
   176  		IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 192, 0, 2, 1},
   177  		"192.0.2.1",
   178  		[]byte("192.0.2.1"),
   179  		nil,
   180  	},
   181  	{
   182  		IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 0, 0, 0},
   183  		"0.0.0.0",
   184  		[]byte("0.0.0.0"),
   185  		nil,
   186  	},
   187  
   188  	// IPv6 address
   189  	{
   190  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1},
   191  		"2001:db8::123:12:1",
   192  		[]byte("2001:db8::123:12:1"),
   193  		nil,
   194  	},
   195  	{
   196  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1},
   197  		"2001:db8::1",
   198  		[]byte("2001:db8::1"),
   199  		nil,
   200  	},
   201  	{
   202  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1},
   203  		"2001:db8:0:1:0:1:0:1",
   204  		[]byte("2001:db8:0:1:0:1:0:1"),
   205  		nil,
   206  	},
   207  	{
   208  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0},
   209  		"2001:db8:1:0:1:0:1:0",
   210  		[]byte("2001:db8:1:0:1:0:1:0"),
   211  		nil,
   212  	},
   213  	{
   214  		IP{0x20, 0x1, 0, 0, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
   215  		"2001::1:0:0:1",
   216  		[]byte("2001::1:0:0:1"),
   217  		nil,
   218  	},
   219  	{
   220  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0},
   221  		"2001:db8:0:0:1::",
   222  		[]byte("2001:db8:0:0:1::"),
   223  		nil,
   224  	},
   225  	{
   226  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
   227  		"2001:db8::1:0:0:1",
   228  		[]byte("2001:db8::1:0:0:1"),
   229  		nil,
   230  	},
   231  	{
   232  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0xa, 0, 0xb, 0, 0xc, 0, 0xd},
   233  		"2001:db8::a:b:c:d",
   234  		[]byte("2001:db8::a:b:c:d"),
   235  		nil,
   236  	},
   237  	{
   238  		IPv6unspecified,
   239  		"::",
   240  		[]byte("::"),
   241  		nil,
   242  	},
   243  
   244  	// IP wildcard equivalent address in Dial/Listen API
   245  	{
   246  		nil,
   247  		"<nil>",
   248  		nil,
   249  		nil,
   250  	},
   251  
   252  	// Opaque byte sequence
   253  	{
   254  		IP{0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef},
   255  		"?0123456789abcdef",
   256  		nil,
   257  		&AddrError{Err: "invalid IP address", Addr: "0123456789abcdef"},
   258  	},
   259  }
   260  
   261  func TestIPString(t *testing.T) {
   262  	for _, tt := range ipStringTests {
   263  		if out := tt.in.String(); out != tt.str {
   264  			t.Errorf("IP.String(%v) = %q, want %q", tt.in, out, tt.str)
   265  		}
   266  		if out, err := tt.in.MarshalText(); !bytes.Equal(out, tt.byt) || !reflect.DeepEqual(err, tt.error) {
   267  			t.Errorf("IP.MarshalText(%v) = %v, %v, want %v, %v", tt.in, out, err, tt.byt, tt.error)
   268  		}
   269  	}
   270  }
   271  
   272  var sink string
   273  
   274  func BenchmarkIPString(b *testing.B) {
   275  	testHookUninstaller.Do(uninstallTestHooks)
   276  
   277  	b.Run("IPv4", func(b *testing.B) {
   278  		benchmarkIPString(b, IPv4len)
   279  	})
   280  
   281  	b.Run("IPv6", func(b *testing.B) {
   282  		benchmarkIPString(b, IPv6len)
   283  	})
   284  }
   285  
   286  func benchmarkIPString(b *testing.B, size int) {
   287  	b.ReportAllocs()
   288  	b.ResetTimer()
   289  	for i := 0; i < b.N; i++ {
   290  		for _, tt := range ipStringTests {
   291  			if tt.in != nil && len(tt.in) == size {
   292  				sink = tt.in.String()
   293  			}
   294  		}
   295  	}
   296  }
   297  
   298  var ipMaskTests = []struct {
   299  	in   IP
   300  	mask IPMask
   301  	out  IP
   302  }{
   303  	{IPv4(192, 168, 1, 127), IPv4Mask(255, 255, 255, 128), IPv4(192, 168, 1, 0)},
   304  	{IPv4(192, 168, 1, 127), IPMask(ParseIP("255.255.255.192")), IPv4(192, 168, 1, 64)},
   305  	{IPv4(192, 168, 1, 127), IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffe0")), IPv4(192, 168, 1, 96)},
   306  	{IPv4(192, 168, 1, 127), IPv4Mask(255, 0, 255, 0), IPv4(192, 0, 1, 0)},
   307  	{ParseIP("2001:db8::1"), IPMask(ParseIP("ffff:ff80::")), ParseIP("2001:d80::")},
   308  	{ParseIP("2001:db8::1"), IPMask(ParseIP("f0f0:0f0f::")), ParseIP("2000:d08::")},
   309  }
   310  
   311  func TestIPMask(t *testing.T) {
   312  	for _, tt := range ipMaskTests {
   313  		if out := tt.in.Mask(tt.mask); out == nil || !tt.out.Equal(out) {
   314  			t.Errorf("IP(%v).Mask(%v) = %v, want %v", tt.in, tt.mask, out, tt.out)
   315  		}
   316  	}
   317  }
   318  
   319  var ipMaskStringTests = []struct {
   320  	in  IPMask
   321  	out string
   322  }{
   323  	{IPv4Mask(255, 255, 255, 240), "fffffff0"},
   324  	{IPv4Mask(255, 0, 128, 0), "ff008000"},
   325  	{IPMask(ParseIP("ffff:ff80::")), "ffffff80000000000000000000000000"},
   326  	{IPMask(ParseIP("ef00:ff80::cafe:0")), "ef00ff800000000000000000cafe0000"},
   327  	{nil, "<nil>"},
   328  }
   329  
   330  func TestIPMaskString(t *testing.T) {
   331  	for _, tt := range ipMaskStringTests {
   332  		if out := tt.in.String(); out != tt.out {
   333  			t.Errorf("IPMask.String(%v) = %q, want %q", tt.in, out, tt.out)
   334  		}
   335  	}
   336  }
   337  
   338  func BenchmarkIPMaskString(b *testing.B) {
   339  	testHookUninstaller.Do(uninstallTestHooks)
   340  
   341  	for i := 0; i < b.N; i++ {
   342  		for _, tt := range ipMaskStringTests {
   343  			sink = tt.in.String()
   344  		}
   345  	}
   346  }
   347  
   348  var parseCIDRTests = []struct {
   349  	in  string
   350  	ip  IP
   351  	net *IPNet
   352  	err error
   353  }{
   354  	{"135.104.0.0/32", IPv4(135, 104, 0, 0), &IPNet{IP: IPv4(135, 104, 0, 0), Mask: IPv4Mask(255, 255, 255, 255)}, nil},
   355  	{"0.0.0.0/24", IPv4(0, 0, 0, 0), &IPNet{IP: IPv4(0, 0, 0, 0), Mask: IPv4Mask(255, 255, 255, 0)}, nil},
   356  	{"135.104.0.0/24", IPv4(135, 104, 0, 0), &IPNet{IP: IPv4(135, 104, 0, 0), Mask: IPv4Mask(255, 255, 255, 0)}, nil},
   357  	{"135.104.0.1/32", IPv4(135, 104, 0, 1), &IPNet{IP: IPv4(135, 104, 0, 1), Mask: IPv4Mask(255, 255, 255, 255)}, nil},
   358  	{"135.104.0.1/24", IPv4(135, 104, 0, 1), &IPNet{IP: IPv4(135, 104, 0, 0), Mask: IPv4Mask(255, 255, 255, 0)}, nil},
   359  	{"::1/128", ParseIP("::1"), &IPNet{IP: ParseIP("::1"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"))}, nil},
   360  	{"abcd:2345::/127", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe"))}, nil},
   361  	{"abcd:2345::/65", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff:8000::"))}, nil},
   362  	{"abcd:2345::/64", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff::"))}, nil},
   363  	{"abcd:2345::/63", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:fffe::"))}, nil},
   364  	{"abcd:2345::/33", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:8000::"))}, nil},
   365  	{"abcd:2345::/32", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff::"))}, nil},
   366  	{"abcd:2344::/31", ParseIP("abcd:2344::"), &IPNet{IP: ParseIP("abcd:2344::"), Mask: IPMask(ParseIP("ffff:fffe::"))}, nil},
   367  	{"abcd:2300::/24", ParseIP("abcd:2300::"), &IPNet{IP: ParseIP("abcd:2300::"), Mask: IPMask(ParseIP("ffff:ff00::"))}, nil},
   368  	{"abcd:2345::/24", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2300::"), Mask: IPMask(ParseIP("ffff:ff00::"))}, nil},
   369  	{"2001:DB8::/48", ParseIP("2001:DB8::"), &IPNet{IP: ParseIP("2001:DB8::"), Mask: IPMask(ParseIP("ffff:ffff:ffff::"))}, nil},
   370  	{"2001:DB8::1/48", ParseIP("2001:DB8::1"), &IPNet{IP: ParseIP("2001:DB8::"), Mask: IPMask(ParseIP("ffff:ffff:ffff::"))}, nil},
   371  	{"192.168.1.1/255.255.255.0", nil, nil, &ParseError{Type: "CIDR address", Text: "192.168.1.1/255.255.255.0"}},
   372  	{"192.168.1.1/35", nil, nil, &ParseError{Type: "CIDR address", Text: "192.168.1.1/35"}},
   373  	{"2001:db8::1/-1", nil, nil, &ParseError{Type: "CIDR address", Text: "2001:db8::1/-1"}},
   374  	{"2001:db8::1/-0", nil, nil, &ParseError{Type: "CIDR address", Text: "2001:db8::1/-0"}},
   375  	{"-0.0.0.0/32", nil, nil, &ParseError{Type: "CIDR address", Text: "-0.0.0.0/32"}},
   376  	{"0.-1.0.0/32", nil, nil, &ParseError{Type: "CIDR address", Text: "0.-1.0.0/32"}},
   377  	{"0.0.-2.0/32", nil, nil, &ParseError{Type: "CIDR address", Text: "0.0.-2.0/32"}},
   378  	{"0.0.0.-3/32", nil, nil, &ParseError{Type: "CIDR address", Text: "0.0.0.-3/32"}},
   379  	{"0.0.0.0/-0", nil, nil, &ParseError{Type: "CIDR address", Text: "0.0.0.0/-0"}},
   380  	{"127.000.000.001/32", nil, nil, &ParseError{Type: "CIDR address", Text: "127.000.000.001/32"}},
   381  	{"", nil, nil, &ParseError{Type: "CIDR address", Text: ""}},
   382  }
   383  
   384  func TestParseCIDR(t *testing.T) {
   385  	for _, tt := range parseCIDRTests {
   386  		ip, net, err := ParseCIDR(tt.in)
   387  		if !reflect.DeepEqual(err, tt.err) {
   388  			t.Errorf("ParseCIDR(%q) = %v, %v; want %v, %v", tt.in, ip, net, tt.ip, tt.net)
   389  		}
   390  		if err == nil && (!tt.ip.Equal(ip) || !tt.net.IP.Equal(net.IP) || !reflect.DeepEqual(net.Mask, tt.net.Mask)) {
   391  			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)
   392  		}
   393  	}
   394  }
   395  
   396  var ipNetContainsTests = []struct {
   397  	ip  IP
   398  	net *IPNet
   399  	ok  bool
   400  }{
   401  	{IPv4(172, 16, 1, 1), &IPNet{IP: IPv4(172, 16, 0, 0), Mask: CIDRMask(12, 32)}, true},
   402  	{IPv4(172, 24, 0, 1), &IPNet{IP: IPv4(172, 16, 0, 0), Mask: CIDRMask(13, 32)}, false},
   403  	{IPv4(192, 168, 0, 3), &IPNet{IP: IPv4(192, 168, 0, 0), Mask: IPv4Mask(0, 0, 255, 252)}, true},
   404  	{IPv4(192, 168, 0, 4), &IPNet{IP: IPv4(192, 168, 0, 0), Mask: IPv4Mask(0, 255, 0, 252)}, false},
   405  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:1::"), Mask: CIDRMask(47, 128)}, true},
   406  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:2::"), Mask: CIDRMask(47, 128)}, false},
   407  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:1::"), Mask: IPMask(ParseIP("ffff:0:ffff::"))}, true},
   408  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:1::"), Mask: IPMask(ParseIP("0:0:0:ffff::"))}, false},
   409  }
   410  
   411  func TestIPNetContains(t *testing.T) {
   412  	for _, tt := range ipNetContainsTests {
   413  		if ok := tt.net.Contains(tt.ip); ok != tt.ok {
   414  			t.Errorf("IPNet(%v).Contains(%v) = %v, want %v", tt.net, tt.ip, ok, tt.ok)
   415  		}
   416  	}
   417  }
   418  
   419  var ipNetStringTests = []struct {
   420  	in  *IPNet
   421  	out string
   422  }{
   423  	{&IPNet{IP: IPv4(192, 168, 1, 0), Mask: CIDRMask(26, 32)}, "192.168.1.0/26"},
   424  	{&IPNet{IP: IPv4(192, 168, 1, 0), Mask: IPv4Mask(255, 0, 255, 0)}, "192.168.1.0/ff00ff00"},
   425  	{&IPNet{IP: ParseIP("2001:db8::"), Mask: CIDRMask(55, 128)}, "2001:db8::/55"},
   426  	{&IPNet{IP: ParseIP("2001:db8::"), Mask: IPMask(ParseIP("8000:f123:0:cafe::"))}, "2001:db8::/8000f1230000cafe0000000000000000"},
   427  	{nil, "<nil>"},
   428  }
   429  
   430  func TestIPNetString(t *testing.T) {
   431  	for _, tt := range ipNetStringTests {
   432  		if out := tt.in.String(); out != tt.out {
   433  			t.Errorf("IPNet.String(%v) = %q, want %q", tt.in, out, tt.out)
   434  		}
   435  	}
   436  }
   437  
   438  var cidrMaskTests = []struct {
   439  	ones int
   440  	bits int
   441  	out  IPMask
   442  }{
   443  	{0, 32, IPv4Mask(0, 0, 0, 0)},
   444  	{12, 32, IPv4Mask(255, 240, 0, 0)},
   445  	{24, 32, IPv4Mask(255, 255, 255, 0)},
   446  	{32, 32, IPv4Mask(255, 255, 255, 255)},
   447  	{0, 128, IPMask{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
   448  	{4, 128, IPMask{0xf0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
   449  	{48, 128, IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
   450  	{128, 128, IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}},
   451  	{33, 32, nil},
   452  	{32, 33, nil},
   453  	{-1, 128, nil},
   454  	{128, -1, nil},
   455  }
   456  
   457  func TestCIDRMask(t *testing.T) {
   458  	for _, tt := range cidrMaskTests {
   459  		if out := CIDRMask(tt.ones, tt.bits); !reflect.DeepEqual(out, tt.out) {
   460  			t.Errorf("CIDRMask(%v, %v) = %v, want %v", tt.ones, tt.bits, out, tt.out)
   461  		}
   462  	}
   463  }
   464  
   465  var (
   466  	v4addr         = IP{192, 168, 0, 1}
   467  	v4mappedv6addr = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 192, 168, 0, 1}
   468  	v6addr         = IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1}
   469  	v4mask         = IPMask{255, 255, 255, 0}
   470  	v4mappedv6mask = IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 255, 255, 255, 0}
   471  	v6mask         = IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0, 0}
   472  	badaddr        = IP{192, 168, 0}
   473  	badmask        = IPMask{255, 255, 0}
   474  	v4maskzero     = IPMask{0, 0, 0, 0}
   475  )
   476  
   477  var networkNumberAndMaskTests = []struct {
   478  	in  IPNet
   479  	out IPNet
   480  }{
   481  	{IPNet{IP: v4addr, Mask: v4mask}, IPNet{IP: v4addr, Mask: v4mask}},
   482  	{IPNet{IP: v4addr, Mask: v4mappedv6mask}, IPNet{IP: v4addr, Mask: v4mask}},
   483  	{IPNet{IP: v4mappedv6addr, Mask: v4mappedv6mask}, IPNet{IP: v4addr, Mask: v4mask}},
   484  	{IPNet{IP: v4mappedv6addr, Mask: v6mask}, IPNet{IP: v4addr, Mask: v4maskzero}},
   485  	{IPNet{IP: v4addr, Mask: v6mask}, IPNet{IP: v4addr, Mask: v4maskzero}},
   486  	{IPNet{IP: v6addr, Mask: v6mask}, IPNet{IP: v6addr, Mask: v6mask}},
   487  	{IPNet{IP: v6addr, Mask: v4mappedv6mask}, IPNet{IP: v6addr, Mask: v4mappedv6mask}},
   488  	{in: IPNet{IP: v6addr, Mask: v4mask}},
   489  	{in: IPNet{IP: v4addr, Mask: badmask}},
   490  	{in: IPNet{IP: v4mappedv6addr, Mask: badmask}},
   491  	{in: IPNet{IP: v6addr, Mask: badmask}},
   492  	{in: IPNet{IP: badaddr, Mask: v4mask}},
   493  	{in: IPNet{IP: badaddr, Mask: v4mappedv6mask}},
   494  	{in: IPNet{IP: badaddr, Mask: v6mask}},
   495  	{in: IPNet{IP: badaddr, Mask: badmask}},
   496  }
   497  
   498  func TestNetworkNumberAndMask(t *testing.T) {
   499  	for _, tt := range networkNumberAndMaskTests {
   500  		ip, m := networkNumberAndMask(&tt.in)
   501  		out := &IPNet{IP: ip, Mask: m}
   502  		if !reflect.DeepEqual(&tt.out, out) {
   503  			t.Errorf("networkNumberAndMask(%v) = %v, want %v", tt.in, out, &tt.out)
   504  		}
   505  	}
   506  }
   507  
   508  func TestSplitHostPort(t *testing.T) {
   509  	for _, tt := range []struct {
   510  		hostPort string
   511  		host     string
   512  		port     string
   513  	}{
   514  		// Host name
   515  		{"localhost:http", "localhost", "http"},
   516  		{"localhost:80", "localhost", "80"},
   517  
   518  		// Go-specific host name with zone identifier
   519  		{"localhost%lo0:http", "localhost%lo0", "http"},
   520  		{"localhost%lo0:80", "localhost%lo0", "80"},
   521  		{"[localhost%lo0]:http", "localhost%lo0", "http"}, // Go 1 behavior
   522  		{"[localhost%lo0]:80", "localhost%lo0", "80"},     // Go 1 behavior
   523  
   524  		// IP literal
   525  		{"127.0.0.1:http", "127.0.0.1", "http"},
   526  		{"127.0.0.1:80", "127.0.0.1", "80"},
   527  		{"[::1]:http", "::1", "http"},
   528  		{"[::1]:80", "::1", "80"},
   529  
   530  		// IP literal with zone identifier
   531  		{"[::1%lo0]:http", "::1%lo0", "http"},
   532  		{"[::1%lo0]:80", "::1%lo0", "80"},
   533  
   534  		// Go-specific wildcard for host name
   535  		{":http", "", "http"}, // Go 1 behavior
   536  		{":80", "", "80"},     // Go 1 behavior
   537  
   538  		// Go-specific wildcard for service name or transport port number
   539  		{"golang.org:", "golang.org", ""}, // Go 1 behavior
   540  		{"127.0.0.1:", "127.0.0.1", ""},   // Go 1 behavior
   541  		{"[::1]:", "::1", ""},             // Go 1 behavior
   542  
   543  		// Opaque service name
   544  		{"golang.org:https%foo", "golang.org", "https%foo"}, // Go 1 behavior
   545  	} {
   546  		if host, port, err := SplitHostPort(tt.hostPort); host != tt.host || port != tt.port || err != nil {
   547  			t.Errorf("SplitHostPort(%q) = %q, %q, %v; want %q, %q, nil", tt.hostPort, host, port, err, tt.host, tt.port)
   548  		}
   549  	}
   550  
   551  	for _, tt := range []struct {
   552  		hostPort string
   553  		err      string
   554  	}{
   555  		{"golang.org", "missing port in address"},
   556  		{"127.0.0.1", "missing port in address"},
   557  		{"[::1]", "missing port in address"},
   558  		{"[fe80::1%lo0]", "missing port in address"},
   559  		{"[localhost%lo0]", "missing port in address"},
   560  		{"localhost%lo0", "missing port in address"},
   561  
   562  		{"::1", "too many colons in address"},
   563  		{"fe80::1%lo0", "too many colons in address"},
   564  		{"fe80::1%lo0:80", "too many colons in address"},
   565  
   566  		// Test cases that didn't fail in Go 1
   567  
   568  		{"[foo:bar]", "missing port in address"},
   569  		{"[foo:bar]baz", "missing port in address"},
   570  		{"[foo]bar:baz", "missing port in address"},
   571  
   572  		{"[foo]:[bar]:baz", "too many colons in address"},
   573  
   574  		{"[foo]:[bar]baz", "unexpected '[' in address"},
   575  		{"foo[bar]:baz", "unexpected '[' in address"},
   576  
   577  		{"foo]bar:baz", "unexpected ']' in address"},
   578  	} {
   579  		if host, port, err := SplitHostPort(tt.hostPort); err == nil {
   580  			t.Errorf("SplitHostPort(%q) should have failed", tt.hostPort)
   581  		} else {
   582  			e := err.(*AddrError)
   583  			if e.Err != tt.err {
   584  				t.Errorf("SplitHostPort(%q) = _, _, %q; want %q", tt.hostPort, e.Err, tt.err)
   585  			}
   586  			if host != "" || port != "" {
   587  				t.Errorf("SplitHostPort(%q) = %q, %q, err; want %q, %q, err on failure", tt.hostPort, host, port, "", "")
   588  			}
   589  		}
   590  	}
   591  }
   592  
   593  func TestJoinHostPort(t *testing.T) {
   594  	for _, tt := range []struct {
   595  		host     string
   596  		port     string
   597  		hostPort string
   598  	}{
   599  		// Host name
   600  		{"localhost", "http", "localhost:http"},
   601  		{"localhost", "80", "localhost:80"},
   602  
   603  		// Go-specific host name with zone identifier
   604  		{"localhost%lo0", "http", "localhost%lo0:http"},
   605  		{"localhost%lo0", "80", "localhost%lo0:80"},
   606  
   607  		// IP literal
   608  		{"127.0.0.1", "http", "127.0.0.1:http"},
   609  		{"127.0.0.1", "80", "127.0.0.1:80"},
   610  		{"::1", "http", "[::1]:http"},
   611  		{"::1", "80", "[::1]:80"},
   612  
   613  		// IP literal with zone identifier
   614  		{"::1%lo0", "http", "[::1%lo0]:http"},
   615  		{"::1%lo0", "80", "[::1%lo0]:80"},
   616  
   617  		// Go-specific wildcard for host name
   618  		{"", "http", ":http"}, // Go 1 behavior
   619  		{"", "80", ":80"},     // Go 1 behavior
   620  
   621  		// Go-specific wildcard for service name or transport port number
   622  		{"golang.org", "", "golang.org:"}, // Go 1 behavior
   623  		{"127.0.0.1", "", "127.0.0.1:"},   // Go 1 behavior
   624  		{"::1", "", "[::1]:"},             // Go 1 behavior
   625  
   626  		// Opaque service name
   627  		{"golang.org", "https%foo", "golang.org:https%foo"}, // Go 1 behavior
   628  	} {
   629  		if hostPort := JoinHostPort(tt.host, tt.port); hostPort != tt.hostPort {
   630  			t.Errorf("JoinHostPort(%q, %q) = %q; want %q", tt.host, tt.port, hostPort, tt.hostPort)
   631  		}
   632  	}
   633  }
   634  
   635  var ipAddrFamilyTests = []struct {
   636  	in  IP
   637  	af4 bool
   638  	af6 bool
   639  }{
   640  	{IPv4bcast, true, false},
   641  	{IPv4allsys, true, false},
   642  	{IPv4allrouter, true, false},
   643  	{IPv4zero, true, false},
   644  	{IPv4(224, 0, 0, 1), true, false},
   645  	{IPv4(127, 0, 0, 1), true, false},
   646  	{IPv4(240, 0, 0, 1), true, false},
   647  	{IPv6unspecified, false, true},
   648  	{IPv6loopback, false, true},
   649  	{IPv6interfacelocalallnodes, false, true},
   650  	{IPv6linklocalallnodes, false, true},
   651  	{IPv6linklocalallrouters, false, true},
   652  	{ParseIP("ff05::a:b:c:d"), false, true},
   653  	{ParseIP("fe80::1:2:3:4"), false, true},
   654  	{ParseIP("2001:db8::123:12:1"), false, true},
   655  }
   656  
   657  func TestIPAddrFamily(t *testing.T) {
   658  	for _, tt := range ipAddrFamilyTests {
   659  		if af := tt.in.To4() != nil; af != tt.af4 {
   660  			t.Errorf("verifying IPv4 address family for %q = %v, want %v", tt.in, af, tt.af4)
   661  		}
   662  		if af := len(tt.in) == IPv6len && tt.in.To4() == nil; af != tt.af6 {
   663  			t.Errorf("verifying IPv6 address family for %q = %v, want %v", tt.in, af, tt.af6)
   664  		}
   665  	}
   666  }
   667  
   668  var ipAddrScopeTests = []struct {
   669  	scope func(IP) bool
   670  	in    IP
   671  	ok    bool
   672  }{
   673  	{IP.IsUnspecified, IPv4zero, true},
   674  	{IP.IsUnspecified, IPv4(127, 0, 0, 1), false},
   675  	{IP.IsUnspecified, IPv6unspecified, true},
   676  	{IP.IsUnspecified, IPv6interfacelocalallnodes, false},
   677  	{IP.IsUnspecified, nil, false},
   678  	{IP.IsLoopback, IPv4(127, 0, 0, 1), true},
   679  	{IP.IsLoopback, IPv4(127, 255, 255, 254), true},
   680  	{IP.IsLoopback, IPv4(128, 1, 2, 3), false},
   681  	{IP.IsLoopback, IPv6loopback, true},
   682  	{IP.IsLoopback, IPv6linklocalallrouters, false},
   683  	{IP.IsLoopback, nil, false},
   684  	{IP.IsMulticast, IPv4(224, 0, 0, 0), true},
   685  	{IP.IsMulticast, IPv4(239, 0, 0, 0), true},
   686  	{IP.IsMulticast, IPv4(240, 0, 0, 0), false},
   687  	{IP.IsMulticast, IPv6linklocalallnodes, true},
   688  	{IP.IsMulticast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, true},
   689  	{IP.IsMulticast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   690  	{IP.IsMulticast, nil, false},
   691  	{IP.IsInterfaceLocalMulticast, IPv4(224, 0, 0, 0), false},
   692  	{IP.IsInterfaceLocalMulticast, IPv4(0xff, 0x01, 0, 0), false},
   693  	{IP.IsInterfaceLocalMulticast, IPv6interfacelocalallnodes, true},
   694  	{IP.IsInterfaceLocalMulticast, nil, false},
   695  	{IP.IsLinkLocalMulticast, IPv4(224, 0, 0, 0), true},
   696  	{IP.IsLinkLocalMulticast, IPv4(239, 0, 0, 0), false},
   697  	{IP.IsLinkLocalMulticast, IPv4(0xff, 0x02, 0, 0), false},
   698  	{IP.IsLinkLocalMulticast, IPv6linklocalallrouters, true},
   699  	{IP.IsLinkLocalMulticast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   700  	{IP.IsLinkLocalMulticast, nil, false},
   701  	{IP.IsLinkLocalUnicast, IPv4(169, 254, 0, 0), true},
   702  	{IP.IsLinkLocalUnicast, IPv4(169, 255, 0, 0), false},
   703  	{IP.IsLinkLocalUnicast, IPv4(0xfe, 0x80, 0, 0), false},
   704  	{IP.IsLinkLocalUnicast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, true},
   705  	{IP.IsLinkLocalUnicast, IP{0xfe, 0xc0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   706  	{IP.IsLinkLocalUnicast, nil, false},
   707  	{IP.IsGlobalUnicast, IPv4(240, 0, 0, 0), true},
   708  	{IP.IsGlobalUnicast, IPv4(232, 0, 0, 0), false},
   709  	{IP.IsGlobalUnicast, IPv4(169, 254, 0, 0), false},
   710  	{IP.IsGlobalUnicast, IPv4bcast, false},
   711  	{IP.IsGlobalUnicast, IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1}, true},
   712  	{IP.IsGlobalUnicast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   713  	{IP.IsGlobalUnicast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   714  	{IP.IsGlobalUnicast, nil, false},
   715  	{IP.IsPrivate, nil, false},
   716  	{IP.IsPrivate, IPv4(1, 1, 1, 1), false},
   717  	{IP.IsPrivate, IPv4(9, 255, 255, 255), false},
   718  	{IP.IsPrivate, IPv4(10, 0, 0, 0), true},
   719  	{IP.IsPrivate, IPv4(10, 255, 255, 255), true},
   720  	{IP.IsPrivate, IPv4(11, 0, 0, 0), false},
   721  	{IP.IsPrivate, IPv4(172, 15, 255, 255), false},
   722  	{IP.IsPrivate, IPv4(172, 16, 0, 0), true},
   723  	{IP.IsPrivate, IPv4(172, 16, 255, 255), true},
   724  	{IP.IsPrivate, IPv4(172, 23, 18, 255), true},
   725  	{IP.IsPrivate, IPv4(172, 31, 255, 255), true},
   726  	{IP.IsPrivate, IPv4(172, 31, 0, 0), true},
   727  	{IP.IsPrivate, IPv4(172, 32, 0, 0), false},
   728  	{IP.IsPrivate, IPv4(192, 167, 255, 255), false},
   729  	{IP.IsPrivate, IPv4(192, 168, 0, 0), true},
   730  	{IP.IsPrivate, IPv4(192, 168, 255, 255), true},
   731  	{IP.IsPrivate, IPv4(192, 169, 0, 0), false},
   732  	{IP.IsPrivate, IP{0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, false},
   733  	{IP.IsPrivate, IP{0xfc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, true},
   734  	{IP.IsPrivate, IP{0xfc, 0xff, 0x12, 0, 0, 0, 0, 0x44, 0, 0, 0, 0, 0, 0, 0, 0}, true},
   735  	{IP.IsPrivate, IP{0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, true},
   736  	{IP.IsPrivate, IP{0xfe, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
   737  }
   738  
   739  func name(f any) string {
   740  	return runtime.FuncForPC(reflect.ValueOf(f).Pointer()).Name()
   741  }
   742  
   743  func TestIPAddrScope(t *testing.T) {
   744  	for _, tt := range ipAddrScopeTests {
   745  		if ok := tt.scope(tt.in); ok != tt.ok {
   746  			t.Errorf("%s(%q) = %v, want %v", name(tt.scope), tt.in, ok, tt.ok)
   747  		}
   748  		ip := tt.in.To4()
   749  		if ip == nil {
   750  			continue
   751  		}
   752  		if ok := tt.scope(ip); ok != tt.ok {
   753  			t.Errorf("%s(%q) = %v, want %v", name(tt.scope), ip, ok, tt.ok)
   754  		}
   755  	}
   756  }
   757  
   758  func BenchmarkIPEqual(b *testing.B) {
   759  	b.Run("IPv4", func(b *testing.B) {
   760  		benchmarkIPEqual(b, IPv4len)
   761  	})
   762  	b.Run("IPv6", func(b *testing.B) {
   763  		benchmarkIPEqual(b, IPv6len)
   764  	})
   765  }
   766  
   767  func benchmarkIPEqual(b *testing.B, size int) {
   768  	ips := make([]IP, 1000)
   769  	for i := range ips {
   770  		ips[i] = make(IP, size)
   771  		rand.Read(ips[i])
   772  	}
   773  	// Half of the N are equal.
   774  	for i := 0; i < b.N/2; i++ {
   775  		x := ips[i%len(ips)]
   776  		y := ips[i%len(ips)]
   777  		x.Equal(y)
   778  	}
   779  	// The other half are not equal.
   780  	for i := 0; i < b.N/2; i++ {
   781  		x := ips[i%len(ips)]
   782  		y := ips[(i+1)%len(ips)]
   783  		x.Equal(y)
   784  	}
   785  }
   786  

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