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Resolver: improved PTR response processing. The previous code only parsed the first answer, without checking its type, and required a compressed RR name. The new code checks the RR type, supports responses with multiple answers, and doesn't require the RR name to be compressed. This has a side effect in limited support of CNAME. If a response includes both CNAME and PTR RRs, like when recursion is enabled on the server, PTR RR is handled. Full CNAME support in PTR response is not implemented in this change.
author Ruslan Ermilov <ru@nginx.com>
date Thu, 17 Dec 2015 17:21:16 +0300
parents 9d06921918af
children 8c4d07ef08f5
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/* 
 * Copyright (C) 2002-2016 Igor Sysoev
 * Copyright (C) 2011-2016 Nginx, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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 * 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.
 */