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