// 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 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) } } } }