dnsname_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  //go:build !js && !wasip1
     6  
     7  package net
     8  
     9  import (
    10  	"strings"
    11  	"testing"
    12  )
    13  
    14  type dnsNameTest struct {
    15  	name   string
    16  	result bool
    17  }
    18  
    19  var dnsNameTests = []dnsNameTest{
    20  	// RFC 2181, section 11.
    21  	{"_xmpp-server._tcp.google.com", true},
    22  	{"foo.com", true},
    23  	{"1foo.com", true},
    24  	{"26.0.0.73.com", true},
    25  	{"10-0-0-1", true},
    26  	{"fo-o.com", true},
    27  	{"fo1o.com", true},
    28  	{"foo1.com", true},
    29  	{"a.b..com", false},
    30  	{"a.b-.com", false},
    31  	{"a.b.com-", false},
    32  	{"a.b..", false},
    33  	{"b.com.", true},
    34  }
    35  
    36  func emitDNSNameTest(ch chan<- dnsNameTest) {
    37  	defer close(ch)
    38  	var char63 = ""
    39  	for i := 0; i < 63; i++ {
    40  		char63 += "a"
    41  	}
    42  	char64 := char63 + "a"
    43  	longDomain := strings.Repeat(char63+".", 5) + "example"
    44  
    45  	for _, tc := range dnsNameTests {
    46  		ch <- tc
    47  	}
    48  
    49  	ch <- dnsNameTest{char63 + ".com", true}
    50  	ch <- dnsNameTest{char64 + ".com", false}
    51  
    52  	// Remember: wire format is two octets longer than presentation
    53  	// (length octets for the first and [root] last labels).
    54  	// 253 is fine:
    55  	ch <- dnsNameTest{longDomain[len(longDomain)-253:], true}
    56  	// A terminal dot doesn't contribute to length:
    57  	ch <- dnsNameTest{longDomain[len(longDomain)-253:] + ".", true}
    58  	// 254 is bad:
    59  	ch <- dnsNameTest{longDomain[len(longDomain)-254:], false}
    60  }
    61  
    62  func TestDNSName(t *testing.T) {
    63  	ch := make(chan dnsNameTest)
    64  	go emitDNSNameTest(ch)
    65  	for tc := range ch {
    66  		if isDomainName(tc.name) != tc.result {
    67  			t.Errorf("isDomainName(%q) = %v; want %v", tc.name, !tc.result, tc.result)
    68  		}
    69  	}
    70  }
    71  
    72  func BenchmarkDNSName(b *testing.B) {
    73  	testHookUninstaller.Do(uninstallTestHooks)
    74  
    75  	benchmarks := append(dnsNameTests, []dnsNameTest{
    76  		{strings.Repeat("a", 63), true},
    77  		{strings.Repeat("a", 64), false},
    78  	}...)
    79  	for n := 0; n < b.N; n++ {
    80  		for _, tc := range benchmarks {
    81  			if isDomainName(tc.name) != tc.result {
    82  				b.Errorf("isDomainName(%q) = %v; want %v", tc.name, !tc.result, tc.result)
    83  			}
    84  		}
    85  	}
    86  }
    87
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