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Source file src/net/dnsname_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  	"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  	{"fo-o.com", true},
    26  	{"fo1o.com", true},
    27  	{"foo1.com", true},
    28  	{"a.b..com", false},
    29  	{"a.b-.com", false},
    30  	{"a.b.com-", false},
    31  	{"a.b..", false},
    32  	{"b.com.", true},
    33  }
    34  
    35  func emitDNSNameTest(ch chan<- dnsNameTest) {
    36  	defer close(ch)
    37  	var char63 = ""
    38  	for i := 0; i < 63; i++ {
    39  		char63 += "a"
    40  	}
    41  	char64 := char63 + "a"
    42  	longDomain := strings.Repeat(char63+".", 5) + "example"
    43  
    44  	for _, tc := range dnsNameTests {
    45  		ch <- tc
    46  	}
    47  
    48  	ch <- dnsNameTest{char63 + ".com", true}
    49  	ch <- dnsNameTest{char64 + ".com", false}
    50  
    51  	// Remember: wire format is two octets longer than presentation
    52  	// (length octets for the first and [root] last labels).
    53  	// 253 is fine:
    54  	ch <- dnsNameTest{longDomain[len(longDomain)-253:], true}
    55  	// A terminal dot doesn't contribute to length:
    56  	ch <- dnsNameTest{longDomain[len(longDomain)-253:] + ".", true}
    57  	// 254 is bad:
    58  	ch <- dnsNameTest{longDomain[len(longDomain)-254:], false}
    59  }
    60  
    61  func TestDNSName(t *testing.T) {
    62  	ch := make(chan dnsNameTest)
    63  	go emitDNSNameTest(ch)
    64  	for tc := range ch {
    65  		if isDomainName(tc.name) != tc.result {
    66  			t.Errorf("isDomainName(%q) = %v; want %v", tc.name, !tc.result, tc.result)
    67  		}
    68  	}
    69  }
    70  
    71  func BenchmarkDNSName(b *testing.B) {
    72  	testHookUninstaller.Do(uninstallTestHooks)
    73  
    74  	benchmarks := append(dnsNameTests, []dnsNameTest{
    75  		{strings.Repeat("a", 63), true},
    76  		{strings.Repeat("a", 64), false},
    77  	}...)
    78  	for n := 0; n < b.N; n++ {
    79  		for _, tc := range benchmarks {
    80  			if isDomainName(tc.name) != tc.result {
    81  				b.Errorf("isDomainName(%q) = %v; want %v", tc.name, !tc.result, tc.result)
    82  			}
    83  		}
    84  	}
    85  }
    86  

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