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148 lines
3.3 KiB
C++
148 lines
3.3 KiB
C++
#include "srv_data.hpp"
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#include <llarp/util/str.hpp>
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#include <llarp/util/logging.hpp>
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#include <limits>
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#include <oxenc/bt_serialize.h>
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#include "llarp/util/bencode.h"
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#include "llarp/util/types.hpp"
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namespace llarp::dns
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{
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static auto logcat = log::Cat("dns");
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bool
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SRVData::IsValid() const
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{
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// if target is of first two forms outlined above
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if (target == "." or target.size() == 0)
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{
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return true;
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}
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// check target size is not absurd
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if (target.size() > TARGET_MAX_SIZE)
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{
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log::warning(logcat, "SRVData target larger than max size ({})", TARGET_MAX_SIZE);
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return false;
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}
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// does target end in .loki?
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size_t pos = target.find(".loki");
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if (pos != std::string::npos && pos == (target.size() - 5))
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{
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return true;
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}
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// does target end in .snode?
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pos = target.find(".snode");
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if (pos != std::string::npos && pos == (target.size() - 6))
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{
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return true;
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}
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// if we're here, target is invalid
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log::warning(logcat, "SRVData invalid");
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return false;
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}
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SRVTuple
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SRVData::toTuple() const
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{
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return std::make_tuple(service_proto, priority, weight, port, target);
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}
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SRVData
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SRVData::fromTuple(SRVTuple tuple)
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{
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SRVData s;
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std::tie(s.service_proto, s.priority, s.weight, s.port, s.target) = std::move(tuple);
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return s;
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}
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bool
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SRVData::fromString(std::string_view srvString)
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{
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log::debug(logcat, "SRVData::fromString(\"{}\")", srvString);
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// split on spaces, discard trailing empty strings
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auto splits = split(srvString, " ", false);
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if (splits.size() != 5 && splits.size() != 4)
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{
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log::warning(logcat, "SRV record should have either 4 or 5 space-separated parts");
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return false;
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}
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service_proto = splits[0];
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if (not parse_int(splits[1], priority))
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{
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log::warning(logcat, "SRV record failed to parse \"{}\" as uint16_t (priority)", splits[1]);
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return false;
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}
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if (not parse_int(splits[2], weight))
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{
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log::warning(logcat, "SRV record failed to parse \"{}\" as uint16_t (weight)", splits[2]);
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return false;
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}
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if (not parse_int(splits[3], port))
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{
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log::warning(logcat, "SRV record failed to parse \"{}\" as uint16_t (port)", splits[3]);
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return false;
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}
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if (splits.size() == 5)
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target = splits[4];
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else
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target = "";
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return IsValid();
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}
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bool
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SRVData::BEncode(llarp_buffer_t* buf) const
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{
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const std::string data = oxenc::bt_serialize(toTuple());
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return buf->write(data.begin(), data.end());
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}
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bool
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SRVData::BDecode(llarp_buffer_t* buf)
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{
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byte_t* begin = buf->cur;
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if (not bencode_discard(buf))
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return false;
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byte_t* end = buf->cur;
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std::string_view srvString{
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reinterpret_cast<char*>(begin), static_cast<std::size_t>(end - begin)};
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try
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{
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SRVTuple tuple{};
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oxenc::bt_deserialize(srvString, tuple);
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*this = fromTuple(std::move(tuple));
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return IsValid();
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}
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catch (const oxenc::bt_deserialize_invalid&)
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{
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return false;
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};
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}
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util::StatusObject
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SRVData::ExtractStatus() const
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{
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return util::StatusObject{
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{"proto", service_proto},
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{"priority", priority},
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{"weight", weight},
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{"port", port},
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{"target", target}};
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}
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} // namespace llarp::dns
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