70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2016 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef SHRPX_DUAL_DNS_RESOLVER_H
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#define SHRPX_DUAL_DNS_RESOLVER_H
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#include "shrpx.h"
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#include <ev.h>
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#include "shrpx_dns_resolver.h"
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using namespace nghttp2;
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namespace shrpx {
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// DualDNSResolver performs name resolution for both A and AAAA
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// records at the same time. The first successful return (or if we
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// have both successful results, prefer to AAAA) is chosen. This is
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// wrapper around 2 DNSResolver inside. resolve(), get_status(), and
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// how CompleteCb is called have the same semantics with DNSResolver.
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class DualDNSResolver {
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public:
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// |family| controls IP version preference. If |family| ==
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// AF_UNSPEC, bot A and AAAA lookups are performed. If |family| ==
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// AF_INET, only A lookup is performed. If |family| == AF_INET6,
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// only AAAA lookup is performed.
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DualDNSResolver(struct ev_loop *loop, int family);
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// Resolves |host|. |host| must be NULL-terminated string.
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int resolve(const StringRef &host);
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CompleteCb get_complete_cb() const;
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void set_complete_cb(CompleteCb cb);
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DNSResolverStatus get_status(Address *result) const;
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private:
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// IP version preference.
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int family_;
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// For A record
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DNSResolver resolv4_;
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// For AAAA record
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DNSResolver resolv6_;
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CompleteCb complete_cb_;
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};
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} // namespace shrpx
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#endif // SHRPX_DUAL_DNS_RESOLVER_H
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