mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-03 23:15:52 +00:00
146 lines
3.2 KiB
C++
146 lines
3.2 KiB
C++
#include "srv_data.hpp"
|
|
#include <llarp/util/str.hpp>
|
|
#include <llarp/util/logging/logger.hpp>
|
|
|
|
#include <limits>
|
|
|
|
#include <oxenmq/bt_serialize.h>
|
|
#include "llarp/util/bencode.h"
|
|
#include "llarp/util/types.hpp"
|
|
|
|
namespace llarp::dns
|
|
{
|
|
bool
|
|
SRVData::IsValid() const
|
|
{
|
|
// if target is of first two forms outlined above
|
|
if (target == "." or target.size() == 0)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
// check target size is not absurd
|
|
if (target.size() > TARGET_MAX_SIZE)
|
|
{
|
|
LogWarn("SRVData target larger than max size (", TARGET_MAX_SIZE, ")");
|
|
return false;
|
|
}
|
|
|
|
// does target end in .loki?
|
|
size_t pos = target.find(".loki");
|
|
if (pos != std::string::npos && pos == (target.size() - 5))
|
|
{
|
|
return true;
|
|
}
|
|
|
|
// does target end in .snode?
|
|
pos = target.find(".snode");
|
|
if (pos != std::string::npos && pos == (target.size() - 6))
|
|
{
|
|
return true;
|
|
}
|
|
|
|
// if we're here, target is invalid
|
|
LogWarn("SRVData invalid");
|
|
return false;
|
|
}
|
|
|
|
SRVTuple
|
|
SRVData::toTuple() const
|
|
{
|
|
return std::make_tuple(service_proto, priority, weight, port, target);
|
|
}
|
|
|
|
SRVData
|
|
SRVData::fromTuple(SRVTuple tuple)
|
|
{
|
|
SRVData s;
|
|
|
|
std::tie(s.service_proto, s.priority, s.weight, s.port, s.target) = std::move(tuple);
|
|
|
|
return s;
|
|
}
|
|
|
|
bool
|
|
SRVData::fromString(std::string_view srvString)
|
|
{
|
|
LogDebug("SRVData::fromString(\"", srvString, "\")");
|
|
|
|
// split on spaces, discard trailing empty strings
|
|
auto splits = split(srvString, " ", false);
|
|
|
|
if (splits.size() != 5 && splits.size() != 4)
|
|
{
|
|
LogWarn("SRV record should have either 4 or 5 space-separated parts");
|
|
return false;
|
|
}
|
|
|
|
service_proto = splits[0];
|
|
|
|
if (not parse_int(splits[1], priority))
|
|
{
|
|
LogWarn("SRV record failed to parse \"", splits[1], "\" as uint16_t (priority)");
|
|
return false;
|
|
}
|
|
|
|
if (not parse_int(splits[2], weight))
|
|
{
|
|
LogWarn("SRV record failed to parse \"", splits[2], "\" as uint16_t (weight)");
|
|
return false;
|
|
}
|
|
|
|
if (not parse_int(splits[3], port))
|
|
{
|
|
LogWarn("SRV record failed to parse \"", splits[3], "\" as uint16_t (port)");
|
|
return false;
|
|
}
|
|
|
|
if (splits.size() == 5)
|
|
target = splits[4];
|
|
else
|
|
target = "";
|
|
|
|
return IsValid();
|
|
}
|
|
|
|
bool
|
|
SRVData::BEncode(llarp_buffer_t* buf) const
|
|
{
|
|
const std::string data = oxenmq::bt_serialize(toTuple());
|
|
return buf->write(data.begin(), data.end());
|
|
}
|
|
|
|
bool
|
|
SRVData::BDecode(llarp_buffer_t* buf)
|
|
{
|
|
byte_t* begin = buf->cur;
|
|
if (not bencode_discard(buf))
|
|
return false;
|
|
byte_t* end = buf->cur;
|
|
std::string_view srvString{
|
|
reinterpret_cast<char*>(begin), static_cast<std::size_t>(end - begin)};
|
|
try
|
|
{
|
|
SRVTuple tuple{};
|
|
oxenmq::bt_deserialize(srvString, tuple);
|
|
*this = fromTuple(std::move(tuple));
|
|
return IsValid();
|
|
}
|
|
catch (const oxenmq::bt_deserialize_invalid&)
|
|
{
|
|
return false;
|
|
};
|
|
}
|
|
|
|
util::StatusObject
|
|
SRVData::ExtractStatus() const
|
|
{
|
|
return util::StatusObject{
|
|
{"proto", service_proto},
|
|
{"priority", priority},
|
|
{"weight", weight},
|
|
{"port", port},
|
|
{"target", target}};
|
|
}
|
|
} // namespace llarp::dns
|