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Source file src/net/ip_test.go

Documentation: net

  // 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 (
  	"bytes"
  	"math/rand"
  	"reflect"
  	"runtime"
  	"testing"
  )
  
  var parseIPTests = []struct {
  	in  string
  	out IP
  }{
  	{"127.0.1.2", IPv4(127, 0, 1, 2)},
  	{"127.0.0.1", IPv4(127, 0, 0, 1)},
  	{"127.001.002.003", IPv4(127, 1, 2, 3)},
  	{"::ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
  	{"::ffff:127.001.002.003", IPv4(127, 1, 2, 3)},
  	{"::ffff:7f01:0203", IPv4(127, 1, 2, 3)},
  	{"0:0:0:0:0000:ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
  	{"0:0:0:0:000000:ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
  	{"0:0:0:0::ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
  
  	{"2001:4860:0:2001::68", IP{0x20, 0x01, 0x48, 0x60, 0, 0, 0x20, 0x01, 0, 0, 0, 0, 0, 0, 0x00, 0x68}},
  	{"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}},
  
  	{"-0.0.0.0", nil},
  	{"0.-1.0.0", nil},
  	{"0.0.-2.0", nil},
  	{"0.0.0.-3", nil},
  	{"127.0.0.256", nil},
  	{"abc", nil},
  	{"123:", nil},
  	{"fe80::1%lo0", nil},
  	{"fe80::1%911", nil},
  	{"", nil},
  	{"a1:a2:a3:a4::b1:b2:b3:b4", nil}, // Issue 6628
  }
  
  func TestParseIP(t *testing.T) {
  	for _, tt := range parseIPTests {
  		if out := ParseIP(tt.in); !reflect.DeepEqual(out, tt.out) {
  			t.Errorf("ParseIP(%q) = %v, want %v", tt.in, out, tt.out)
  		}
  		if tt.in == "" {
  			// Tested in TestMarshalEmptyIP below.
  			continue
  		}
  		var out IP
  		if err := out.UnmarshalText([]byte(tt.in)); !reflect.DeepEqual(out, tt.out) || (tt.out == nil) != (err != nil) {
  			t.Errorf("IP.UnmarshalText(%q) = %v, %v, want %v", tt.in, out, err, tt.out)
  		}
  	}
  }
  
  func TestLookupWithIP(t *testing.T) {
  	_, err := LookupIP("")
  	if err == nil {
  		t.Errorf(`LookupIP("") succeeded, should fail`)
  	}
  	_, err = LookupHost("")
  	if err == nil {
  		t.Errorf(`LookupIP("") succeeded, should fail`)
  	}
  
  	// Test that LookupHost and LookupIP, which normally
  	// expect host names, work with IP addresses.
  	for _, tt := range parseIPTests {
  		if tt.out != nil {
  			addrs, err := LookupHost(tt.in)
  			if len(addrs) != 1 || addrs[0] != tt.in || err != nil {
  				t.Errorf("LookupHost(%q) = %v, %v, want %v, nil", tt.in, addrs, err, []string{tt.in})
  			}
  		} else if !testing.Short() {
  			// We can't control what the host resolver does; if it can resolve, say,
  			// 127.0.0.256 or fe80::1%911 or a host named 'abc', who are we to judge?
  			// Warn about these discrepancies but don't fail the test.
  			addrs, err := LookupHost(tt.in)
  			if err == nil {
  				t.Logf("warning: LookupHost(%q) = %v, want error", tt.in, addrs)
  			}
  		}
  
  		if tt.out != nil {
  			ips, err := LookupIP(tt.in)
  			if len(ips) != 1 || !reflect.DeepEqual(ips[0], tt.out) || err != nil {
  				t.Errorf("LookupIP(%q) = %v, %v, want %v, nil", tt.in, ips, err, []IP{tt.out})
  			}
  		} else if !testing.Short() {
  			ips, err := LookupIP(tt.in)
  			// We can't control what the host resolver does. See above.
  			if err == nil {
  				t.Logf("warning: LookupIP(%q) = %v, want error", tt.in, ips)
  			}
  		}
  	}
  }
  
  func BenchmarkParseIP(b *testing.B) {
  	testHookUninstaller.Do(uninstallTestHooks)
  
  	for i := 0; i < b.N; i++ {
  		for _, tt := range parseIPTests {
  			ParseIP(tt.in)
  		}
  	}
  }
  
  // Issue 6339
  func TestMarshalEmptyIP(t *testing.T) {
  	for _, in := range [][]byte{nil, []byte("")} {
  		var out = IP{1, 2, 3, 4}
  		if err := out.UnmarshalText(in); err != nil || out != nil {
  			t.Errorf("UnmarshalText(%v) = %v, %v; want nil, nil", in, out, err)
  		}
  	}
  	var ip IP
  	got, err := ip.MarshalText()
  	if err != nil {
  		t.Fatal(err)
  	}
  	if !reflect.DeepEqual(got, []byte("")) {
  		t.Errorf(`got %#v, want []byte("")`, got)
  	}
  }
  
  var ipStringTests = []struct {
  	in  IP     // see RFC 791 and RFC 4291
  	str string // see RFC 791, RFC 4291 and RFC 5952
  	byt []byte
  	error
  }{
  	// IPv4 address
  	{
  		IP{192, 0, 2, 1},
  		"192.0.2.1",
  		[]byte("192.0.2.1"),
  		nil,
  	},
  	{
  		IP{0, 0, 0, 0},
  		"0.0.0.0",
  		[]byte("0.0.0.0"),
  		nil,
  	},
  
  	// IPv4-mapped IPv6 address
  	{
  		IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 192, 0, 2, 1},
  		"192.0.2.1",
  		[]byte("192.0.2.1"),
  		nil,
  	},
  	{
  		IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 0, 0, 0},
  		"0.0.0.0",
  		[]byte("0.0.0.0"),
  		nil,
  	},
  
  	// IPv6 address
  	{
  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1},
  		"2001:db8::123:12:1",
  		[]byte("2001:db8::123:12:1"),
  		nil,
  	},
  	{
  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1},
  		"2001:db8::1",
  		[]byte("2001:db8::1"),
  		nil,
  	},
  	{
  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1},
  		"2001:db8:0:1:0:1:0:1",
  		[]byte("2001:db8:0:1:0:1:0:1"),
  		nil,
  	},
  	{
  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0},
  		"2001:db8:1:0:1:0:1:0",
  		[]byte("2001:db8:1:0:1:0:1:0"),
  		nil,
  	},
  	{
  		IP{0x20, 0x1, 0, 0, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
  		"2001::1:0:0:1",
  		[]byte("2001::1:0:0:1"),
  		nil,
  	},
  	{
  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0},
  		"2001:db8:0:0:1::",
  		[]byte("2001:db8:0:0:1::"),
  		nil,
  	},
  	{
  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
  		"2001:db8::1:0:0:1",
  		[]byte("2001:db8::1:0:0:1"),
  		nil,
  	},
  	{
  		IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0xa, 0, 0xb, 0, 0xc, 0, 0xd},
  		"2001:db8::a:b:c:d",
  		[]byte("2001:db8::a:b:c:d"),
  		nil,
  	},
  	{
  		IPv6unspecified,
  		"::",
  		[]byte("::"),
  		nil,
  	},
  
  	// IP wildcard equivalent address in Dial/Listen API
  	{
  		nil,
  		"<nil>",
  		nil,
  		nil,
  	},
  
  	// Opaque byte sequence
  	{
  		IP{0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef},
  		"?0123456789abcdef",
  		nil,
  		&AddrError{Err: "invalid IP address", Addr: "0123456789abcdef"},
  	},
  }
  
  func TestIPString(t *testing.T) {
  	for _, tt := range ipStringTests {
  		if out := tt.in.String(); out != tt.str {
  			t.Errorf("IP.String(%v) = %q, want %q", tt.in, out, tt.str)
  		}
  		if out, err := tt.in.MarshalText(); !bytes.Equal(out, tt.byt) || !reflect.DeepEqual(err, tt.error) {
  			t.Errorf("IP.MarshalText(%v) = %v, %v, want %v, %v", tt.in, out, err, tt.byt, tt.error)
  		}
  	}
  }
  
  var sink string
  
  func BenchmarkIPString(b *testing.B) {
  	testHookUninstaller.Do(uninstallTestHooks)
  
  	for i := 0; i < b.N; i++ {
  		for _, tt := range ipStringTests {
  			if tt.in != nil {
  				sink = tt.in.String()
  			}
  		}
  	}
  }
  
  var ipMaskTests = []struct {
  	in   IP
  	mask IPMask
  	out  IP
  }{
  	{IPv4(192, 168, 1, 127), IPv4Mask(255, 255, 255, 128), IPv4(192, 168, 1, 0)},
  	{IPv4(192, 168, 1, 127), IPMask(ParseIP("255.255.255.192")), IPv4(192, 168, 1, 64)},
  	{IPv4(192, 168, 1, 127), IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffe0")), IPv4(192, 168, 1, 96)},
  	{IPv4(192, 168, 1, 127), IPv4Mask(255, 0, 255, 0), IPv4(192, 0, 1, 0)},
  	{ParseIP("2001:db8::1"), IPMask(ParseIP("ffff:ff80::")), ParseIP("2001:d80::")},
  	{ParseIP("2001:db8::1"), IPMask(ParseIP("f0f0:0f0f::")), ParseIP("2000:d08::")},
  }
  
  func TestIPMask(t *testing.T) {
  	for _, tt := range ipMaskTests {
  		if out := tt.in.Mask(tt.mask); out == nil || !tt.out.Equal(out) {
  			t.Errorf("IP(%v).Mask(%v) = %v, want %v", tt.in, tt.mask, out, tt.out)
  		}
  	}
  }
  
  var ipMaskStringTests = []struct {
  	in  IPMask
  	out string
  }{
  	{IPv4Mask(255, 255, 255, 240), "fffffff0"},
  	{IPv4Mask(255, 0, 128, 0), "ff008000"},
  	{IPMask(ParseIP("ffff:ff80::")), "ffffff80000000000000000000000000"},
  	{IPMask(ParseIP("ef00:ff80::cafe:0")), "ef00ff800000000000000000cafe0000"},
  	{nil, "<nil>"},
  }
  
  func TestIPMaskString(t *testing.T) {
  	for _, tt := range ipMaskStringTests {
  		if out := tt.in.String(); out != tt.out {
  			t.Errorf("IPMask.String(%v) = %q, want %q", tt.in, out, tt.out)
  		}
  	}
  }
  
  func BenchmarkIPMaskString(b *testing.B) {
  	testHookUninstaller.Do(uninstallTestHooks)
  
  	for i := 0; i < b.N; i++ {
  		for _, tt := range ipMaskStringTests {
  			sink = tt.in.String()
  		}
  	}
  }
  
  var parseCIDRTests = []struct {
  	in  string
  	ip  IP
  	net *IPNet
  	err error
  }{
  	{"135.104.0.0/32", IPv4(135, 104, 0, 0), &IPNet{IP: IPv4(135, 104, 0, 0), Mask: IPv4Mask(255, 255, 255, 255)}, nil},
  	{"0.0.0.0/24", IPv4(0, 0, 0, 0), &IPNet{IP: IPv4(0, 0, 0, 0), Mask: IPv4Mask(255, 255, 255, 0)}, nil},
  	{"135.104.0.0/24", IPv4(135, 104, 0, 0), &IPNet{IP: IPv4(135, 104, 0, 0), Mask: IPv4Mask(255, 255, 255, 0)}, nil},
  	{"135.104.0.1/32", IPv4(135, 104, 0, 1), &IPNet{IP: IPv4(135, 104, 0, 1), Mask: IPv4Mask(255, 255, 255, 255)}, nil},
  	{"135.104.0.1/24", IPv4(135, 104, 0, 1), &IPNet{IP: IPv4(135, 104, 0, 0), Mask: IPv4Mask(255, 255, 255, 0)}, nil},
  	{"::1/128", ParseIP("::1"), &IPNet{IP: ParseIP("::1"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"))}, nil},
  	{"abcd:2345::/127", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe"))}, nil},
  	{"abcd:2345::/65", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff:8000::"))}, nil},
  	{"abcd:2345::/64", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:ffff::"))}, nil},
  	{"abcd:2345::/63", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:ffff:fffe::"))}, nil},
  	{"abcd:2345::/33", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff:8000::"))}, nil},
  	{"abcd:2345::/32", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2345::"), Mask: IPMask(ParseIP("ffff:ffff::"))}, nil},
  	{"abcd:2344::/31", ParseIP("abcd:2344::"), &IPNet{IP: ParseIP("abcd:2344::"), Mask: IPMask(ParseIP("ffff:fffe::"))}, nil},
  	{"abcd:2300::/24", ParseIP("abcd:2300::"), &IPNet{IP: ParseIP("abcd:2300::"), Mask: IPMask(ParseIP("ffff:ff00::"))}, nil},
  	{"abcd:2345::/24", ParseIP("abcd:2345::"), &IPNet{IP: ParseIP("abcd:2300::"), Mask: IPMask(ParseIP("ffff:ff00::"))}, nil},
  	{"2001:DB8::/48", ParseIP("2001:DB8::"), &IPNet{IP: ParseIP("2001:DB8::"), Mask: IPMask(ParseIP("ffff:ffff:ffff::"))}, nil},
  	{"2001:DB8::1/48", ParseIP("2001:DB8::1"), &IPNet{IP: ParseIP("2001:DB8::"), Mask: IPMask(ParseIP("ffff:ffff:ffff::"))}, nil},
  	{"192.168.1.1/255.255.255.0", nil, nil, &ParseError{Type: "CIDR address", Text: "192.168.1.1/255.255.255.0"}},
  	{"192.168.1.1/35", nil, nil, &ParseError{Type: "CIDR address", Text: "192.168.1.1/35"}},
  	{"2001:db8::1/-1", nil, nil, &ParseError{Type: "CIDR address", Text: "2001:db8::1/-1"}},
  	{"2001:db8::1/-0", nil, nil, &ParseError{Type: "CIDR address", Text: "2001:db8::1/-0"}},
  	{"-0.0.0.0/32", nil, nil, &ParseError{Type: "CIDR address", Text: "-0.0.0.0/32"}},
  	{"0.-1.0.0/32", nil, nil, &ParseError{Type: "CIDR address", Text: "0.-1.0.0/32"}},
  	{"0.0.-2.0/32", nil, nil, &ParseError{Type: "CIDR address", Text: "0.0.-2.0/32"}},
  	{"0.0.0.-3/32", nil, nil, &ParseError{Type: "CIDR address", Text: "0.0.0.-3/32"}},
  	{"0.0.0.0/-0", nil, nil, &ParseError{Type: "CIDR address", Text: "0.0.0.0/-0"}},
  	{"", nil, nil, &ParseError{Type: "CIDR address", Text: ""}},
  }
  
  func TestParseCIDR(t *testing.T) {
  	for _, tt := range parseCIDRTests {
  		ip, net, err := ParseCIDR(tt.in)
  		if !reflect.DeepEqual(err, tt.err) {
  			t.Errorf("ParseCIDR(%q) = %v, %v; want %v, %v", tt.in, ip, net, tt.ip, tt.net)
  		}
  		if err == nil && (!tt.ip.Equal(ip) || !tt.net.IP.Equal(net.IP) || !reflect.DeepEqual(net.Mask, tt.net.Mask)) {
  			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)
  		}
  	}
  }
  
  var ipNetContainsTests = []struct {
  	ip  IP
  	net *IPNet
  	ok  bool
  }{
  	{IPv4(172, 16, 1, 1), &IPNet{IP: IPv4(172, 16, 0, 0), Mask: CIDRMask(12, 32)}, true},
  	{IPv4(172, 24, 0, 1), &IPNet{IP: IPv4(172, 16, 0, 0), Mask: CIDRMask(13, 32)}, false},
  	{IPv4(192, 168, 0, 3), &IPNet{IP: IPv4(192, 168, 0, 0), Mask: IPv4Mask(0, 0, 255, 252)}, true},
  	{IPv4(192, 168, 0, 4), &IPNet{IP: IPv4(192, 168, 0, 0), Mask: IPv4Mask(0, 255, 0, 252)}, false},
  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:1::"), Mask: CIDRMask(47, 128)}, true},
  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:2::"), Mask: CIDRMask(47, 128)}, false},
  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:1::"), Mask: IPMask(ParseIP("ffff:0:ffff::"))}, true},
  	{ParseIP("2001:db8:1:2::1"), &IPNet{IP: ParseIP("2001:db8:1::"), Mask: IPMask(ParseIP("0:0:0:ffff::"))}, false},
  }
  
  func TestIPNetContains(t *testing.T) {
  	for _, tt := range ipNetContainsTests {
  		if ok := tt.net.Contains(tt.ip); ok != tt.ok {
  			t.Errorf("IPNet(%v).Contains(%v) = %v, want %v", tt.net, tt.ip, ok, tt.ok)
  		}
  	}
  }
  
  var ipNetStringTests = []struct {
  	in  *IPNet
  	out string
  }{
  	{&IPNet{IP: IPv4(192, 168, 1, 0), Mask: CIDRMask(26, 32)}, "192.168.1.0/26"},
  	{&IPNet{IP: IPv4(192, 168, 1, 0), Mask: IPv4Mask(255, 0, 255, 0)}, "192.168.1.0/ff00ff00"},
  	{&IPNet{IP: ParseIP("2001:db8::"), Mask: CIDRMask(55, 128)}, "2001:db8::/55"},
  	{&IPNet{IP: ParseIP("2001:db8::"), Mask: IPMask(ParseIP("8000:f123:0:cafe::"))}, "2001:db8::/8000f1230000cafe0000000000000000"},
  }
  
  func TestIPNetString(t *testing.T) {
  	for _, tt := range ipNetStringTests {
  		if out := tt.in.String(); out != tt.out {
  			t.Errorf("IPNet.String(%v) = %q, want %q", tt.in, out, tt.out)
  		}
  	}
  }
  
  var cidrMaskTests = []struct {
  	ones int
  	bits int
  	out  IPMask
  }{
  	{0, 32, IPv4Mask(0, 0, 0, 0)},
  	{12, 32, IPv4Mask(255, 240, 0, 0)},
  	{24, 32, IPv4Mask(255, 255, 255, 0)},
  	{32, 32, IPv4Mask(255, 255, 255, 255)},
  	{0, 128, IPMask{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
  	{4, 128, IPMask{0xf0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
  	{48, 128, IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
  	{128, 128, IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}},
  	{33, 32, nil},
  	{32, 33, nil},
  	{-1, 128, nil},
  	{128, -1, nil},
  }
  
  func TestCIDRMask(t *testing.T) {
  	for _, tt := range cidrMaskTests {
  		if out := CIDRMask(tt.ones, tt.bits); !reflect.DeepEqual(out, tt.out) {
  			t.Errorf("CIDRMask(%v, %v) = %v, want %v", tt.ones, tt.bits, out, tt.out)
  		}
  	}
  }
  
  var (
  	v4addr         = IP{192, 168, 0, 1}
  	v4mappedv6addr = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 192, 168, 0, 1}
  	v6addr         = IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1}
  	v4mask         = IPMask{255, 255, 255, 0}
  	v4mappedv6mask = IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 255, 255, 255, 0}
  	v6mask         = IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0, 0}
  	badaddr        = IP{192, 168, 0}
  	badmask        = IPMask{255, 255, 0}
  	v4maskzero     = IPMask{0, 0, 0, 0}
  )
  
  var networkNumberAndMaskTests = []struct {
  	in  IPNet
  	out IPNet
  }{
  	{IPNet{IP: v4addr, Mask: v4mask}, IPNet{IP: v4addr, Mask: v4mask}},
  	{IPNet{IP: v4addr, Mask: v4mappedv6mask}, IPNet{IP: v4addr, Mask: v4mask}},
  	{IPNet{IP: v4mappedv6addr, Mask: v4mappedv6mask}, IPNet{IP: v4addr, Mask: v4mask}},
  	{IPNet{IP: v4mappedv6addr, Mask: v6mask}, IPNet{IP: v4addr, Mask: v4maskzero}},
  	{IPNet{IP: v4addr, Mask: v6mask}, IPNet{IP: v4addr, Mask: v4maskzero}},
  	{IPNet{IP: v6addr, Mask: v6mask}, IPNet{IP: v6addr, Mask: v6mask}},
  	{IPNet{IP: v6addr, Mask: v4mappedv6mask}, IPNet{IP: v6addr, Mask: v4mappedv6mask}},
  	{in: IPNet{IP: v6addr, Mask: v4mask}},
  	{in: IPNet{IP: v4addr, Mask: badmask}},
  	{in: IPNet{IP: v4mappedv6addr, Mask: badmask}},
  	{in: IPNet{IP: v6addr, Mask: badmask}},
  	{in: IPNet{IP: badaddr, Mask: v4mask}},
  	{in: IPNet{IP: badaddr, Mask: v4mappedv6mask}},
  	{in: IPNet{IP: badaddr, Mask: v6mask}},
  	{in: IPNet{IP: badaddr, Mask: badmask}},
  }
  
  func TestNetworkNumberAndMask(t *testing.T) {
  	for _, tt := range networkNumberAndMaskTests {
  		ip, m := networkNumberAndMask(&tt.in)
  		out := &IPNet{IP: ip, Mask: m}
  		if !reflect.DeepEqual(&tt.out, out) {
  			t.Errorf("networkNumberAndMask(%v) = %v, want %v", tt.in, out, &tt.out)
  		}
  	}
  }
  
  func TestSplitHostPort(t *testing.T) {
  	for _, tt := range []struct {
  		hostPort string
  		host     string
  		port     string
  	}{
  		// Host name
  		{"localhost:http", "localhost", "http"},
  		{"localhost:80", "localhost", "80"},
  
  		// Go-specific host name with zone identifier
  		{"localhost%lo0:http", "localhost%lo0", "http"},
  		{"localhost%lo0:80", "localhost%lo0", "80"},
  		{"[localhost%lo0]:http", "localhost%lo0", "http"}, // Go 1 behavior
  		{"[localhost%lo0]:80", "localhost%lo0", "80"},     // Go 1 behavior
  
  		// IP literal
  		{"127.0.0.1:http", "127.0.0.1", "http"},
  		{"127.0.0.1:80", "127.0.0.1", "80"},
  		{"[::1]:http", "::1", "http"},
  		{"[::1]:80", "::1", "80"},
  
  		// IP literal with zone identifier
  		{"[::1%lo0]:http", "::1%lo0", "http"},
  		{"[::1%lo0]:80", "::1%lo0", "80"},
  
  		// Go-specific wildcard for host name
  		{":http", "", "http"}, // Go 1 behavior
  		{":80", "", "80"},     // Go 1 behavior
  
  		// Go-specific wildcard for service name or transport port number
  		{"golang.org:", "golang.org", ""}, // Go 1 behavior
  		{"127.0.0.1:", "127.0.0.1", ""},   // Go 1 behavior
  		{"[::1]:", "::1", ""},             // Go 1 behavior
  
  		// Opaque service name
  		{"golang.org:https%foo", "golang.org", "https%foo"}, // Go 1 behavior
  	} {
  		if host, port, err := SplitHostPort(tt.hostPort); host != tt.host || port != tt.port || err != nil {
  			t.Errorf("SplitHostPort(%q) = %q, %q, %v; want %q, %q, nil", tt.hostPort, host, port, err, tt.host, tt.port)
  		}
  	}
  
  	for _, tt := range []struct {
  		hostPort string
  		err      string
  	}{
  		{"golang.org", "missing port in address"},
  		{"127.0.0.1", "missing port in address"},
  		{"[::1]", "missing port in address"},
  		{"[fe80::1%lo0]", "missing port in address"},
  		{"[localhost%lo0]", "missing port in address"},
  		{"localhost%lo0", "missing port in address"},
  
  		{"::1", "too many colons in address"},
  		{"fe80::1%lo0", "too many colons in address"},
  		{"fe80::1%lo0:80", "too many colons in address"},
  
  		// Test cases that didn't fail in Go 1
  
  		{"[foo:bar]", "missing port in address"},
  		{"[foo:bar]baz", "missing port in address"},
  		{"[foo]bar:baz", "missing port in address"},
  
  		{"[foo]:[bar]:baz", "too many colons in address"},
  
  		{"[foo]:[bar]baz", "unexpected '[' in address"},
  		{"foo[bar]:baz", "unexpected '[' in address"},
  
  		{"foo]bar:baz", "unexpected ']' in address"},
  	} {
  		if host, port, err := SplitHostPort(tt.hostPort); err == nil {
  			t.Errorf("SplitHostPort(%q) should have failed", tt.hostPort)
  		} else {
  			e := err.(*AddrError)
  			if e.Err != tt.err {
  				t.Errorf("SplitHostPort(%q) = _, _, %q; want %q", tt.hostPort, e.Err, tt.err)
  			}
  			if host != "" || port != "" {
  				t.Errorf("SplitHostPort(%q) = %q, %q, err; want %q, %q, err on failure", tt.hostPort, host, port, "", "")
  			}
  		}
  	}
  }
  
  func TestJoinHostPort(t *testing.T) {
  	for _, tt := range []struct {
  		host     string
  		port     string
  		hostPort string
  	}{
  		// Host name
  		{"localhost", "http", "localhost:http"},
  		{"localhost", "80", "localhost:80"},
  
  		// Go-specific host name with zone identifier
  		{"localhost%lo0", "http", "localhost%lo0:http"},
  		{"localhost%lo0", "80", "localhost%lo0:80"},
  
  		// IP literal
  		{"127.0.0.1", "http", "127.0.0.1:http"},
  		{"127.0.0.1", "80", "127.0.0.1:80"},
  		{"::1", "http", "[::1]:http"},
  		{"::1", "80", "[::1]:80"},
  
  		// IP literal with zone identifier
  		{"::1%lo0", "http", "[::1%lo0]:http"},
  		{"::1%lo0", "80", "[::1%lo0]:80"},
  
  		// Go-specific wildcard for host name
  		{"", "http", ":http"}, // Go 1 behavior
  		{"", "80", ":80"},     // Go 1 behavior
  
  		// Go-specific wildcard for service name or transport port number
  		{"golang.org", "", "golang.org:"}, // Go 1 behavior
  		{"127.0.0.1", "", "127.0.0.1:"},   // Go 1 behavior
  		{"::1", "", "[::1]:"},             // Go 1 behavior
  
  		// Opaque service name
  		{"golang.org", "https%foo", "golang.org:https%foo"}, // Go 1 behavior
  	} {
  		if hostPort := JoinHostPort(tt.host, tt.port); hostPort != tt.hostPort {
  			t.Errorf("JoinHostPort(%q, %q) = %q; want %q", tt.host, tt.port, hostPort, tt.hostPort)
  		}
  	}
  }
  
  var ipAddrFamilyTests = []struct {
  	in  IP
  	af4 bool
  	af6 bool
  }{
  	{IPv4bcast, true, false},
  	{IPv4allsys, true, false},
  	{IPv4allrouter, true, false},
  	{IPv4zero, true, false},
  	{IPv4(224, 0, 0, 1), true, false},
  	{IPv4(127, 0, 0, 1), true, false},
  	{IPv4(240, 0, 0, 1), true, false},
  	{IPv6unspecified, false, true},
  	{IPv6loopback, false, true},
  	{IPv6interfacelocalallnodes, false, true},
  	{IPv6linklocalallnodes, false, true},
  	{IPv6linklocalallrouters, false, true},
  	{ParseIP("ff05::a:b:c:d"), false, true},
  	{ParseIP("fe80::1:2:3:4"), false, true},
  	{ParseIP("2001:db8::123:12:1"), false, true},
  }
  
  func TestIPAddrFamily(t *testing.T) {
  	for _, tt := range ipAddrFamilyTests {
  		if af := tt.in.To4() != nil; af != tt.af4 {
  			t.Errorf("verifying IPv4 address family for %q = %v, want %v", tt.in, af, tt.af4)
  		}
  		if af := len(tt.in) == IPv6len && tt.in.To4() == nil; af != tt.af6 {
  			t.Errorf("verifying IPv6 address family for %q = %v, want %v", tt.in, af, tt.af6)
  		}
  	}
  }
  
  var ipAddrScopeTests = []struct {
  	scope func(IP) bool
  	in    IP
  	ok    bool
  }{
  	{IP.IsUnspecified, IPv4zero, true},
  	{IP.IsUnspecified, IPv4(127, 0, 0, 1), false},
  	{IP.IsUnspecified, IPv6unspecified, true},
  	{IP.IsUnspecified, IPv6interfacelocalallnodes, false},
  	{IP.IsUnspecified, nil, false},
  	{IP.IsLoopback, IPv4(127, 0, 0, 1), true},
  	{IP.IsLoopback, IPv4(127, 255, 255, 254), true},
  	{IP.IsLoopback, IPv4(128, 1, 2, 3), false},
  	{IP.IsLoopback, IPv6loopback, true},
  	{IP.IsLoopback, IPv6linklocalallrouters, false},
  	{IP.IsLoopback, nil, false},
  	{IP.IsMulticast, IPv4(224, 0, 0, 0), true},
  	{IP.IsMulticast, IPv4(239, 0, 0, 0), true},
  	{IP.IsMulticast, IPv4(240, 0, 0, 0), false},
  	{IP.IsMulticast, IPv6linklocalallnodes, true},
  	{IP.IsMulticast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, true},
  	{IP.IsMulticast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
  	{IP.IsMulticast, nil, false},
  	{IP.IsInterfaceLocalMulticast, IPv4(224, 0, 0, 0), false},
  	{IP.IsInterfaceLocalMulticast, IPv4(0xff, 0x01, 0, 0), false},
  	{IP.IsInterfaceLocalMulticast, IPv6interfacelocalallnodes, true},
  	{IP.IsInterfaceLocalMulticast, nil, false},
  	{IP.IsLinkLocalMulticast, IPv4(224, 0, 0, 0), true},
  	{IP.IsLinkLocalMulticast, IPv4(239, 0, 0, 0), false},
  	{IP.IsLinkLocalMulticast, IPv4(0xff, 0x02, 0, 0), false},
  	{IP.IsLinkLocalMulticast, IPv6linklocalallrouters, true},
  	{IP.IsLinkLocalMulticast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
  	{IP.IsLinkLocalMulticast, nil, false},
  	{IP.IsLinkLocalUnicast, IPv4(169, 254, 0, 0), true},
  	{IP.IsLinkLocalUnicast, IPv4(169, 255, 0, 0), false},
  	{IP.IsLinkLocalUnicast, IPv4(0xfe, 0x80, 0, 0), false},
  	{IP.IsLinkLocalUnicast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, true},
  	{IP.IsLinkLocalUnicast, IP{0xfe, 0xc0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
  	{IP.IsLinkLocalUnicast, nil, false},
  	{IP.IsGlobalUnicast, IPv4(240, 0, 0, 0), true},
  	{IP.IsGlobalUnicast, IPv4(232, 0, 0, 0), false},
  	{IP.IsGlobalUnicast, IPv4(169, 254, 0, 0), false},
  	{IP.IsGlobalUnicast, IPv4bcast, false},
  	{IP.IsGlobalUnicast, IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1}, true},
  	{IP.IsGlobalUnicast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
  	{IP.IsGlobalUnicast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false},
  	{IP.IsGlobalUnicast, nil, false},
  }
  
  func name(f interface{}) string {
  	return runtime.FuncForPC(reflect.ValueOf(f).Pointer()).Name()
  }
  
  func TestIPAddrScope(t *testing.T) {
  	for _, tt := range ipAddrScopeTests {
  		if ok := tt.scope(tt.in); ok != tt.ok {
  			t.Errorf("%s(%q) = %v, want %v", name(tt.scope), tt.in, ok, tt.ok)
  		}
  		ip := tt.in.To4()
  		if ip == nil {
  			continue
  		}
  		if ok := tt.scope(ip); ok != tt.ok {
  			t.Errorf("%s(%q) = %v, want %v", name(tt.scope), ip, ok, tt.ok)
  		}
  	}
  }
  
  func BenchmarkIPEqual(b *testing.B) {
  	b.Run("IPv4", func(b *testing.B) {
  		benchmarkIPEqual(b, IPv4len)
  	})
  	b.Run("IPv6", func(b *testing.B) {
  		benchmarkIPEqual(b, IPv6len)
  	})
  }
  
  func benchmarkIPEqual(b *testing.B, size int) {
  	ips := make([]IP, 1000)
  	for i := range ips {
  		ips[i] = make(IP, size)
  		rand.Read(ips[i])
  	}
  	// Half of the N are equal.
  	for i := 0; i < b.N/2; i++ {
  		x := ips[i%len(ips)]
  		y := ips[i%len(ips)]
  		x.Equal(y)
  	}
  	// The other half are not equal.
  	for i := 0; i < b.N/2; i++ {
  		x := ips[i%len(ips)]
  		y := ips[(i+1)%len(ips)]
  		x.Equal(y)
  	}
  }
  

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