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Source file src/net/dnsname_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 (
  	"strings"
  	"testing"
  )
  
  type dnsNameTest struct {
  	name   string
  	result bool
  }
  
  var dnsNameTests = []dnsNameTest{
  	// RFC 2181, section 11.
  	{"_xmpp-server._tcp.google.com", true},
  	{"foo.com", true},
  	{"1foo.com", true},
  	{"26.0.0.73.com", true},
  	{"fo-o.com", true},
  	{"fo1o.com", true},
  	{"foo1.com", true},
  	{"a.b..com", false},
  	{"a.b-.com", false},
  	{"a.b.com-", false},
  	{"a.b..", false},
  	{"b.com.", true},
  }
  
  func emitDNSNameTest(ch chan<- dnsNameTest) {
  	defer close(ch)
  	var char63 = ""
  	for i := 0; i < 63; i++ {
  		char63 += "a"
  	}
  	char64 := char63 + "a"
  	longDomain := strings.Repeat(char63+".", 5) + "example"
  
  	for _, tc := range dnsNameTests {
  		ch <- tc
  	}
  
  	ch <- dnsNameTest{char63 + ".com", true}
  	ch <- dnsNameTest{char64 + ".com", false}
  
  	// Remember: wire format is two octets longer than presentation
  	// (length octets for the first and [root] last labels).
  	// 253 is fine:
  	ch <- dnsNameTest{longDomain[len(longDomain)-253:], true}
  	// A terminal dot doesn't contribute to length:
  	ch <- dnsNameTest{longDomain[len(longDomain)-253:] + ".", true}
  	// 254 is bad:
  	ch <- dnsNameTest{longDomain[len(longDomain)-254:], false}
  }
  
  func TestDNSName(t *testing.T) {
  	ch := make(chan dnsNameTest)
  	go emitDNSNameTest(ch)
  	for tc := range ch {
  		if isDomainName(tc.name) != tc.result {
  			t.Errorf("isDomainName(%q) = %v; want %v", tc.name, !tc.result, tc.result)
  		}
  	}
  }
  
  func BenchmarkDNSName(b *testing.B) {
  	testHookUninstaller.Do(uninstallTestHooks)
  
  	benchmarks := append(dnsNameTests, []dnsNameTest{
  		{strings.Repeat("a", 63), true},
  		{strings.Repeat("a", 64), false},
  	}...)
  	for n := 0; n < b.N; n++ {
  		for _, tc := range benchmarks {
  			if isDomainName(tc.name) != tc.result {
  				b.Errorf("isDomainName(%q) = %v; want %v", tc.name, !tc.result, tc.result)
  			}
  		}
  	}
  }
  

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