mirror of
https://github.com/matrix-construct/construct
synced 2024-06-02 18:18:56 +02:00
433 lines
16 KiB
C++
433 lines
16 KiB
C++
// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk
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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.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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// IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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ircd::mutable_buffer
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ircd::rfc1035::make_query(const mutable_buffer &out,
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const uint16_t &id,
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const question &q)
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{
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const ilist<const question> questions{q};
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return make_query(out, id, questions);
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}
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ircd::mutable_buffer
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ircd::rfc1035::make_query(const mutable_buffer &out,
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const uint16_t &id,
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const vector_view<const question> &questions)
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{
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header h{0};
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h.id = id;
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h.rd = true;
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h.qdcount = bswap(uint16_t(questions.size()));
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return make_query(out, h, questions);
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}
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ircd::mutable_buffer
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ircd::rfc1035::make_query(const mutable_buffer &out,
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const header &header,
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const vector_view<const question> &questions)
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{
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assert(bswap(header.qdcount) == questions.size());
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stream_buffer sb{out};
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sb([&header](const mutable_buffer &buf)
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{
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const const_buffer headbuf
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{
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reinterpret_cast<const char *>(&header), sizeof(header)
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};
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return copy(buf, headbuf);
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});
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for(const auto &question : questions)
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sb([&question](const mutable_buffer &buf)
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{
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return size(question.print(buf));
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});
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return sb.completed();
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}
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ircd::rfc1035::question::question(const string_view &fqdn,
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const uint16_t &qtype)
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:qtype{qtype}
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,namelen
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{
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size(make_name(mutable_buffer{name}, fqdn))
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}
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{
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}
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ircd::const_buffer
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ircd::rfc1035::question::parse(const const_buffer &in)
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{
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if(unlikely(size(in) < 2 + 2 + 2))
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throw error
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{
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"Answer input buffer underflow"
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};
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namelen = parse_name(name, in);
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const char *pos(data(in) + namelen);
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if(unlikely(pos + 2 + 2 > end(in)))
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throw error
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{
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"Question input buffer is incomplete (%zu bytes)", size(in)
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};
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qtype = bswap(*(const uint16_t *)pos); pos += 2;
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qclass = bswap(*(const uint16_t *)pos); pos += 2;
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assert(size_t(pos - data(in)) <= size(in));
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return { data(in), pos };
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}
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ircd::mutable_buffer
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ircd::rfc1035::question::print(const mutable_buffer &buf)
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const
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{
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const size_t required
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{
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namelen + 2 + 2
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};
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if(unlikely(size(buf) < required))
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throw error
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{
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"Not enough space in question buffer; %zu bytes required", required
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};
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char *pos
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{
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data(buf) + copy(buf, const_buffer{name, namelen})
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};
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assert(pos > data(buf));
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assert(*(pos - 1) == '\0');
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*(uint16_t *)pos = bswap(qtype); pos += 2;
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*(uint16_t *)pos = bswap(qclass); pos += 2;
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assert(size_t(std::distance(data(buf), pos)) == required);
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return mutable_buffer
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{
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data(buf), pos
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};
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}
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ircd::const_buffer
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ircd::rfc1035::answer::parse(const const_buffer &in)
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{
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if(unlikely(size(in) < 2 + 2 + 2 + 4 + 2))
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throw error
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{
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"Answer input buffer underflow"
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};
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namelen = parse_name(name, in);
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const char *pos(data(in) + namelen);
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if(unlikely(pos + 2 + 2 + 4 + 2 > end(in)))
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throw error
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{
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"Answer input buffer is incomplete (%zu bytes)", size(in)
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};
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qtype = bswap(*(const uint16_t *)pos); pos += 2;
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qclass = bswap(*(const uint16_t *)pos); pos += 2;
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ttl = bswap(*(const uint32_t *)pos); pos += 4;
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rdlength = bswap(*(const uint16_t *)pos); pos += 2;
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if(unlikely(qclass != 1))
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throw error
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{
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"Resource record not for IN (internet); corrupt data?"
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};
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if(unlikely(pos + rdlength > end(in)))
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throw error
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{
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"Answer input buffer has incomplete data (rdlength: %u)", rdlength
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};
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rdata = const_buffer{pos, rdlength};
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pos += rdlength;
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assert(size_t(pos - data(in)) <= size(in));
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return { data(in), pos };
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}
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ircd::rfc1035::answer::A::A(const const_buffer &rdata)
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{
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assert(size(rdata) == 4);
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if(unlikely(size(rdata) < 4))
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throw error
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{
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"A record data underflow"
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};
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ip4 = bswap(*(const uint32_t *)data(rdata));
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}
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ircd::rfc1035::answer::AAAA::AAAA(const const_buffer &rdata)
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{
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assert(size(rdata) == 16);
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if(unlikely(size(rdata) < 16))
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throw error
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{
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"AAAA record data underflow"
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};
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ip6 = bswap(*(const uint128_t *)data(rdata));
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}
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ircd::rfc1035::answer::CNAME::CNAME(const const_buffer &rdata)
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{
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if(unlikely(size(rdata) < 1))
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throw error
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{
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"CNAME record data underflow"
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};
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namelen = parse_name(name, rdata);
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}
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ircd::rfc1035::answer::SRV::SRV(const const_buffer &rdata)
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{
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if(unlikely(size(rdata) < 2 + 2 + 2 + 1))
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throw error
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{
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"SRV record data underflow"
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};
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const char *pos(data(rdata));
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priority = bswap(*(const uint16_t *)pos); pos += 2;
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weight = bswap(*(const uint16_t *)pos); pos += 2;
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port = bswap(*(const uint16_t *)pos); pos += 2;
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const const_buffer tgtbuf{pos, end(rdata)};
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tgtlen = parse_name(tgt, tgtbuf);
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pos += tgtlen;
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assert(std::distance(pos, end(rdata)) == 0);
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}
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ircd::const_buffer
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ircd::rfc1035::make_name(const mutable_buffer &out,
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const string_view &fqdn)
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{
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assert(!empty(out));
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char *pos{data(out)};
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ircd::tokens(fqdn, '.', [&pos, &out](const string_view &label)
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{
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if(unlikely(size(label) >= 64))
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throw error
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{
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"Single part of domain cannot exceed 63 characters"
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};
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*pos++ = size(label);
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pos += strlcpy(pos, label, std::distance(pos, end(out)));
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});
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// The null terminator is included in the returned buffer view
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assert(*pos == '\0');
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++pos;
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return { data(out), size_t(pos - begin(out)) };
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}
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size_t
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ircd::rfc1035::parse_name(const mutable_buffer &out,
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const const_buffer &in)
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{
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assert(!empty(out));
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if(unlikely(empty(in)))
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throw error
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{
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"Name input buffer underflow"
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};
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const char *pos(data(in));
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if(*pos & uint8_t(192))
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{
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//throw error{"Pointer format not implemented"};
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out[0] = '\0';
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pos += 2;
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return pos - begin(in);
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}
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out[0] = '\0';
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for(uint8_t len(*pos++); len && pos + len < end(in); len = *pos++)
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{
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const string_view label
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{
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reinterpret_cast<const char *>(pos), len
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};
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strlcat(out, label);
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strlcat(out, ".");
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pos += len;
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}
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assert(size_t(pos - begin(in)) <= size(in));
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assert(size_t(pos - begin(in)) <= size(out));
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return pos - begin(in);
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}
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std::string
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ircd::rfc1035::header::debug()
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const
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{
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std::stringstream ss;
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ss << "id : " << id << '\n';
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ss << "opcode : " << uint(opcode) << '\n';
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ss << "rcode : " << uint(rcode) << ' ' << (rfc1035::rcode[rcode]) << '\n';
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ss << "rd : " << (rd? "recursive" : "not recursive") << '\n';
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ss << "tc : " << (tc? "truncated" : "not truncated") << '\n';
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ss << "aa : " << (aa? "authoritative" : "not authoritative") << '\n';
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ss << "qr : " << (qr? "query" : "response") << '\n';
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ss << "cd : " << (cd? "checking disabled" : "checking enabled") << '\n';
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ss << "ad : " << (ad? "authentic data" : "not authentic data") << '\n';
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ss << "ra : " << (ra? "recursion available" : "recursion unavailable") << '\n';
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ss << "qdcount : " << qdcount << '\n';
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ss << "ancount : " << ancount << '\n';
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ss << "nscount : " << nscount << '\n';
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ss << "arcount : " << arcount << '\n';
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return ss.str();
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}
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decltype(ircd::rfc1035::rcode)
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ircd::rfc1035::rcode
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{
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"NoError No Error [RFC1035]", // 0
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"FormErr Format Error [RFC1035]", // 1
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"ServFail Server Failure [RFC1035]", // 2
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"NXDomain Non-Existent Domain [RFC1035]", // 3
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"NotImp Not Implemented [RFC1035]", // 4
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"Refused Query Refused [RFC1035]", // 5
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"YXDomain Name Exists when it should not [RFC2136][RFC6672]", // 6
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"YXRRSet RR Set Exists when it should not [RFC2136]", // 7
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"NXRRSet RR Set that should exist does not [RFC2136]", // 8
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"NotAuth Not Authorized [RFC2845]", // 9
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"NotZone Name not contained in zone [RFC2136]", // 10
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"Unassigned", // 11
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"Unassigned", // 12
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"Unassigned", // 13
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"Unassigned", // 14
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"Unassigned", // 15
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"BADVERS Bad OPT Version [RFC6891]", // 16
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"BADSIG TSIG Signature Failure [RFC2845]", // 17
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"BADKEY Key not recognized [RFC2845]", // 18
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"BADTIME Signature out of time window [RFC2845]", // 19
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"BADMODE Bad TKEY Mode [RFC2930]", // 20
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"BADNAME Duplicate key name [RFC2930]", // 21
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"BADALG Algorithm not supported [RFC2930]", // 22
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"BADTRUNC Bad Truncation [RFC4635]", // 23
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"BADCOOKIE Bad/missing Server Cookie [RFC7873]", // 24
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};
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decltype(ircd::rfc1035::qtype)
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ircd::rfc1035::qtype
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{
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{ "A", 1 }, // a host address [RFC1035]
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{ "NS", 2 }, // an authoritative name server [RFC1035]
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{ "MD", 3 }, // a mail destination (OBSOLETE - use MX) [RFC1035]
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{ "MF", 4 }, // a mail forwarder (OBSOLETE - use MX) [RFC1035]
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{ "CNAME", 5 }, // the canonical name for an alias [RFC1035]
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{ "SOA", 6 }, // marks the start of a zone of authority [RFC1035]
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{ "MB", 7 }, // a mailbox domain name (EXPERIMENTAL) [RFC1035]
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{ "MG", 8 }, // a mail group member (EXPERIMENTAL) [RFC1035]
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{ "MR", 9 }, // a mail rename domain name (EXPERIMENTAL) [RFC1035]
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{ "NULL", 10 }, // a null RR (EXPERIMENTAL) [RFC1035]
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{ "WKS", 11 }, // a well known service description [RFC1035]
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{ "PTR", 12 }, // a domain name pointer [RFC1035]
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{ "HINFO", 13 }, // host information [RFC1035]
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{ "MINFO", 14 }, // mailbox or mail list information [RFC1035]
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{ "MX", 15 }, // mail exchange [RFC1035]
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{ "TXT", 16 }, // text strings [RFC1035]
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{ "RP", 17 }, // for Responsible Person [RFC1183]
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{ "AFSDB", 18 }, // for AFS Data Base location [RFC1183][RFC5864]
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{ "X25", 19 }, // for X.25 PSDN address [RFC1183]
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{ "ISDN", 20 }, // for ISDN address [RFC1183]
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{ "RT", 21 }, // for Route Through [RFC1183]
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{ "NSAP", 22 }, // for NSAP address, NSAP style A record [RFC1706]
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{ "NSAP-PTR", 23 }, // for domain name pointer, NSAP style [RFC1348][RFC1637][RFC1706]
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{ "SIG", 24 }, // for security signature [RFC4034][RFC3755][RFC2535][RFC2536][RFC2537][RFC2931][RFC3110][RFC3008]
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{ "KEY", 25 }, // for security key [RFC4034][RFC3755][RFC2535][RFC2536][RFC2537][RFC2539][RFC3008][RFC3110]
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{ "PX", 26 }, // X.400 mail mapping information [RFC2163]
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{ "GPOS", 27 }, // Geographical Position [RFC1712]
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{ "AAAA", 28 }, // IP6 Address [RFC3596]
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{ "LOC", 29 }, // Location Information [RFC1876]
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{ "NXT", 30 }, // Next Domain (OBSOLETE) [RFC3755][RFC2535]
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{ "EID", 31 }, // Endpoint Identifier [Michael_Patton][http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt]
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{ "NIMLOC", 32 }, // Nimrod Locator [1][Michael_Patton][http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt]
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{ "SRV", 33 }, // Server Selection [1][RFC2782]
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{ "ATMA", 34 }, // ATM Address [ATM Forum Technical Committee]
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{ "NAPTR", 35 }, // Naming Authority Pointer [RFC2915][RFC2168][RFC3403]
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{ "KX", 36 }, // Key Exchanger [RFC2230]
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{ "CERT", 37 }, // CERT [RFC4398]
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{ "A6", 38 }, // A6 (OBSOLETE - use AAAA) [RFC3226][RFC2874][RFC6563]
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{ "DNAME", 39 }, // DNAME [RFC6672]
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{ "SINK", 40 }, // SINK [Donald_E_Eastlake][http://tools.ietf.org/html/draft-eastlake-kitchen-sink] 1997-11
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{ "OPT", 41 }, // OPT [RFC6891][RFC3225]
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{ "APL", 42 }, // APL [RFC3123]
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{ "DS", 43 }, // Delegation Signer [RFC4034][RFC3658]
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{ "SSHFP", 44 }, // SSH Key Fingerprint [RFC4255]
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{ "IPSECKEY", 45 }, // IPSECKEY [RFC4025]
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{ "RRSIG", 46 }, // RRSIG [RFC4034][RFC3755]
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{ "NSEC", 47 }, // NSEC [RFC4034][RFC3755]
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{ "DNSKEY", 48 }, // DNSKEY [RFC4034][RFC3755]
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{ "DHCID", 49 }, // DHCID [RFC4701]
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{ "NSEC3", 50 }, // NSEC3 [RFC5155]
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{ "NSEC3PARAM", 51 }, // NSEC3PARAM [RFC5155]
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{ "TLSA", 52 }, // TLSA [RFC6698]
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{ "SMIMEA", 53 }, // S/MIME cert association [RFC8162]
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{ "HIP", 55 }, // Host Identity Protocol [RFC8005]
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{ "NINFO", 56 }, // NINFO [Jim_Reid] NINFO/ninfo-completed-template
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{ "RKEY", 57 }, // RKEY [Jim_Reid] RKEY/rkey-completed-template
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{ "TALINK", 58 }, // Trust Anchor LINK [Wouter_Wijngaards] TALINK/talink-completed-template
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{ "CDS", 59 }, // Child DS [RFC7344] CDS/cds-completed-template
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{ "CDNSKEY", 60 }, // DNSKEY(s) the Child wants reflected in DS [RFC7344]
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{ "OPENPGPKEY", 61 }, // OpenPGP Key [RFC7929] OPENPGPKEY/openpgpkey-completed-template
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{ "CSYNC", 62 }, // Child-To-Parent Synchronization [RFC7477]
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{ "SPF", 99 }, // [RFC7208]
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{ "UINFO", 100 }, // IANA-Reserved
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{ "UID", 101 }, // IANA-Reserved
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{ "GID", 102 }, // IANA-Reserved
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{ "UNSPEC", 103 }, // IANA-Reserved
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{ "NID", 104 }, // [RFC6742] ILNP/nid-completed-template
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{ "L32", 105 }, // [RFC6742] ILNP/l32-completed-template
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{ "L64", 106 }, // [RFC6742] ILNP/l64-completed-template
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{ "LP", 107 }, // [RFC6742] ILNP/lp-completed-template
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{ "EUI48", 108 }, // an EUI-48 address [RFC7043]
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{ "EUI64", 109 }, // an EUI-64 address [RFC7043]
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{ "TKEY", 249 }, // Transaction Key [RFC2930]
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{ "TSIG", 250 }, // Transaction Signature [RFC2845]
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{ "IXFR", 251 }, // incremental transfer [RFC1995]
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{ "AXFR", 252 }, // transfer of an entire zone [RFC1035][RFC5936]
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{ "MAILB", 253 }, // mailbox-related RRs (MB, MG or MR) [RFC1035]
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{ "MAILA", 254 }, // mail agent RRs (OBSOLETE - see MX) [RFC1035]
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{ "*", 255 }, // A request for all records the server/cache has available [RFC1035][RFC6895]
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{ "URI", 256 }, // URI [RFC7553] URI/uri-completed-template
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{ "CAA", 257 }, // Certification Authority Restriction [RFC6844]
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{ "AVC", 258 }, // Application Visibility and Control [Wolfgang_Riedel]
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{ "DOA", 259 }, // Digital Object Architecture [draft-durand-doa-over-dns]
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{ "TA", 32768 }, // DNSSEC Trust Authorities [Sam_Weiler][http://cameo.library.cmu.edu/]
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};
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