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Experimental, full support for CNAME
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Copyright (c) 2009 The Go Authors. All rights reserved. | ||
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Redistribution and use in source and binary forms, with or without | ||
modification, are permitted provided that the following conditions are | ||
met: | ||
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* Redistributions of source code must retain the above copyright | ||
notice, this list of conditions and the following disclaimer. | ||
* Redistributions in binary form must reproduce the above | ||
copyright notice, this list of conditions and the following disclaimer | ||
in the documentation and/or other materials provided with the | ||
distribution. | ||
* Neither the name of Google Inc. nor the names of its | ||
contributors may be used to endorse or promote products derived from | ||
this software without specific prior written permission. | ||
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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package golang | ||
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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. | ||
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// IsDomainName checks if a string is a presentation-format domain name | ||
// (currently restricted to hostname-compatible "preferred name" LDH labels | ||
// and SRV-like "underscore labels"; see golang.org/issue/12421). | ||
func IsDomainName(s string) bool { | ||
// See RFC 1035, RFC 3696. | ||
// Presentation format has dots before every label except the first, and the | ||
// terminal empty label is optional here because we assume fully-qualified | ||
// (absolute) input. We must therefore reserve space for the first and last | ||
// labels' length octets in wire format, where they are necessary and the | ||
// maximum total length is 255. | ||
// So our _effective_ maximum is 253, but 254 is not rejected if the last | ||
// character is a dot. | ||
l := len(s) | ||
if l == 0 || l > 254 || l == 254 && s[l-1] != '.' { | ||
return false | ||
} | ||
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last := byte('.') | ||
ok := false // Ok once we've seen a letter. | ||
partlen := 0 | ||
for i := 0; i < len(s); i++ { | ||
c := s[i] | ||
switch { | ||
default: | ||
return false | ||
case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '_': | ||
ok = true | ||
partlen++ | ||
case '0' <= c && c <= '9': | ||
// fine | ||
partlen++ | ||
case c == '-': | ||
// Byte before dash cannot be dot. | ||
if last == '.' { | ||
return false | ||
} | ||
partlen++ | ||
case c == '.': | ||
// Byte before dot cannot be dot, dash. | ||
if last == '.' || last == '-' { | ||
return false | ||
} | ||
if partlen > 63 || partlen == 0 { | ||
return false | ||
} | ||
partlen = 0 | ||
} | ||
last = c | ||
} | ||
if last == '-' || partlen > 63 { | ||
return false | ||
} | ||
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return ok | ||
} |
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