mirror of
https://github.com/matrix-construct/construct
synced 2024-08-31 13:55:19 +02:00
221 lines
5.2 KiB
C++
221 lines
5.2 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#include "s_dns.h"
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ircd::mapi::header
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IRCD_MODULE
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{
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"Domain Name System Client, Cache & Components",
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[] // init
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{
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ircd::net::dns::resolver_init();
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},
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[] // fini
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{
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ircd::net::dns::resolver_fini();
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}
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};
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/// Convenience composition with a single ipport callback. This is the result of
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/// an automatic chain of queries such as SRV and A/AAAA based on the input and
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/// intermediate results.
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void
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ircd::net::dns::_resolve_ipport(const hostport &hp,
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opts opts,
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callback_ipport_one callback)
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{
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auto handler
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{
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std::bind(&handle_ipport__A, std::move(callback), ph::_1, ph::_2, ph::_3)
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};
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if(!hp.service)
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return _resolve__A(hp, opts, std::move(handler));
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opts.nxdomain_exceptions = false;
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_resolve__SRV(hp, opts, [opts(opts), handler(std::move(handler))]
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(std::exception_ptr eptr, hostport hp, const rfc1035::record::SRV &record)
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mutable
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{
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if(eptr)
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{
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static const rfc1035::record::A empty;
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return handler(std::move(eptr), hp, empty);
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}
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opts.qtype = 0;
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opts.nxdomain_exceptions = true;
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hp.host = record.tgt?: unmake_SRV_key(hp.host);
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hp.port = record.port? record.port : hp.port;
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_resolve__A(hp, opts, std::move(handler));
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});
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}
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void
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ircd::net::dns::handle_ipport__A(callback_ipport_one callback,
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std::exception_ptr eptr,
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const hostport &hp,
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const rfc1035::record::A &record)
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{
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static const ircd::net::not_found no_record
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{
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"Host has no A record"
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};
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if(!eptr && !record.ip4)
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eptr = std::make_exception_ptr(no_record);
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const ipport ipport
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{
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record.ip4, port(hp)
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};
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callback(std::move(eptr), hp, ipport);
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}
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/// Convenience callback with a single SRV record which was selected from
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/// the vector with stochastic respect for weighting and priority.
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void
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ircd::net::dns::_resolve__SRV(const hostport &hp,
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opts opts,
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callback_SRV_one callback)
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{
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static const auto &qtype
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{
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rfc1035::qtype.at("SRV")
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};
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if(unlikely(opts.qtype && opts.qtype != qtype))
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throw error
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{
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"Specified query type '%s' (%u) but user's callback is for SRV records only.",
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rfc1035::rqtype.at(opts.qtype),
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opts.qtype
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};
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if(!opts.qtype)
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opts.qtype = qtype;
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auto handler
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{
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std::bind(&handle__SRV, std::move(callback), ph::_1, ph::_2, ph::_3)
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};
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_resolve__(hp, opts, std::move(handler));
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}
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void
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ircd::net::dns::handle__SRV(callback_SRV_one callback,
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std::exception_ptr eptr,
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const hostport &hp,
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const records &rrs)
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{
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static const rfc1035::record::SRV empty;
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static const auto &qtype
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{
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rfc1035::qtype.at("SRV")
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};
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if(eptr)
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return callback(std::move(eptr), hp, empty);
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//TODO: prng on weight / prio plz
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for(size_t i(0); i < rrs.size(); ++i)
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{
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const auto &rr(*rrs.at(i));
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if(rr.type != qtype)
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continue;
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const auto &record(rr.as<const rfc1035::record::SRV>());
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return callback(std::move(eptr), hp, record);
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}
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return callback(std::move(eptr), hp, empty);
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}
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/// Convenience callback with a single A record which was selected from
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/// the vector randomly.
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void
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ircd::net::dns::_resolve__A(const hostport &hp,
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opts opts,
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callback_A_one callback)
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{
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static const auto &qtype
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{
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rfc1035::qtype.at("A")
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};
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if(unlikely(opts.qtype && opts.qtype != qtype))
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throw error
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{
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"Specified query type '%s' (%u) but user's callback is for A records only.",
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rfc1035::rqtype.at(opts.qtype),
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opts.qtype
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};
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if(!opts.qtype)
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opts.qtype = qtype;
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auto handler
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{
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std::bind(&handle__A, std::move(callback), ph::_1, ph::_2, ph::_3)
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};
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_resolve__(hp, opts, std::move(handler));
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}
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void
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ircd::net::dns::handle__A(callback_A_one callback,
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std::exception_ptr eptr,
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const hostport &hp,
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const records &rrs)
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{
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static const rfc1035::record::A empty;
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static const auto &qtype
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{
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rfc1035::qtype.at("A")
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};
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if(eptr)
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return callback(std::move(eptr), hp, empty);
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//TODO: prng plz
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for(size_t i(0); i < rrs.size(); ++i)
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{
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const auto &rr(*rrs.at(i));
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if(rr.type != qtype)
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continue;
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const auto &record(rr.as<const rfc1035::record::A>());
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return callback(std::move(eptr), hp, record);
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}
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return callback(std::move(eptr), hp, empty);
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}
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/// Fundamental callback with a vector of abstract resource records.
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void
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ircd::net::dns::_resolve__(const hostport &hp,
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const opts &opts,
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callback cb)
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{
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if(unlikely(!opts.qtype))
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throw error
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{
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"A query type is required; not specified; cannot be deduced here."
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};
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if(opts.cache_check)
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if(cache::get(hp, opts, cb))
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return;
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resolver_call(hp, opts, std::move(cb));
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}
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