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// 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.
//go:build !js && !wasip1
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},
{"10-0-0-1", 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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