mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-19 09:25:28 +00:00
7caa87862e
All #ifndef guards on headers have been removed, I think, in favor of #pragma once Headers are now included as `#include "filename"` if the included file resides in the same directory as the file including it, or any subdirectory therein. Otherwise they are included as `#include <project/top/dir/relative/path/filename>` The above does not include system/os headers.
148 lines
3.0 KiB
C++
148 lines
3.0 KiB
C++
#include "unbound_resolver.hpp"
|
|
|
|
#include "server.hpp"
|
|
#include <llarp/util/buffer.hpp>
|
|
|
|
namespace llarp::dns
|
|
{
|
|
struct PendingUnboundLookup
|
|
{
|
|
std::weak_ptr<UnboundResolver> resolver;
|
|
Message msg;
|
|
SockAddr resolverAddr;
|
|
SockAddr askerAddr;
|
|
};
|
|
|
|
void
|
|
UnboundResolver::Stop()
|
|
{
|
|
Reset();
|
|
}
|
|
|
|
void
|
|
UnboundResolver::Reset()
|
|
{
|
|
started = false;
|
|
if (runner)
|
|
{
|
|
runner->join();
|
|
runner.reset();
|
|
}
|
|
if (unboundContext)
|
|
{
|
|
ub_ctx_delete(unboundContext);
|
|
}
|
|
unboundContext = nullptr;
|
|
}
|
|
|
|
UnboundResolver::UnboundResolver(EventLoop_ptr loop, ReplyFunction reply, FailFunction fail)
|
|
: unboundContext(nullptr)
|
|
, started(false)
|
|
, replyFunc(loop->make_caller(std::move(reply)))
|
|
, failFunc(loop->make_caller(std::move(fail)))
|
|
{}
|
|
|
|
// static callback
|
|
void
|
|
UnboundResolver::Callback(void* data, int err, ub_result* result)
|
|
{
|
|
std::unique_ptr<PendingUnboundLookup> lookup{static_cast<PendingUnboundLookup*>(data)};
|
|
|
|
auto this_ptr = lookup->resolver.lock();
|
|
if (not this_ptr)
|
|
return; // resolver is gone, so we don't reply.
|
|
|
|
if (err != 0)
|
|
{
|
|
Message& msg = lookup->msg;
|
|
msg.AddServFail();
|
|
this_ptr->failFunc(lookup->resolverAddr, lookup->askerAddr, msg);
|
|
ub_resolve_free(result);
|
|
return;
|
|
}
|
|
OwnedBuffer pkt{(size_t)result->answer_len};
|
|
std::memcpy(pkt.buf.get(), result->answer_packet, pkt.sz);
|
|
llarp_buffer_t buf(pkt);
|
|
|
|
MessageHeader hdr;
|
|
hdr.Decode(&buf);
|
|
hdr.id = lookup->msg.hdr_id;
|
|
|
|
buf.cur = buf.base;
|
|
hdr.Encode(&buf);
|
|
|
|
this_ptr->replyFunc(lookup->resolverAddr, lookup->askerAddr, std::move(pkt));
|
|
|
|
ub_resolve_free(result);
|
|
}
|
|
|
|
bool
|
|
UnboundResolver::Init()
|
|
{
|
|
if (started)
|
|
{
|
|
Reset();
|
|
}
|
|
|
|
unboundContext = ub_ctx_create();
|
|
|
|
if (not unboundContext)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
ub_ctx_async(unboundContext, 1);
|
|
runner = std::make_unique<std::thread>([&]() {
|
|
while (started)
|
|
{
|
|
if (unboundContext)
|
|
ub_wait(unboundContext);
|
|
std::this_thread::sleep_for(25ms);
|
|
}
|
|
});
|
|
started = true;
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
UnboundResolver::AddUpstreamResolver(const std::string& upstreamResolverIP)
|
|
{
|
|
if (ub_ctx_set_fwd(unboundContext, upstreamResolverIP.c_str()) != 0)
|
|
{
|
|
Reset();
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void
|
|
UnboundResolver::Lookup(SockAddr to, SockAddr from, Message msg)
|
|
{
|
|
if (not unboundContext)
|
|
{
|
|
msg.AddServFail();
|
|
failFunc(to, from, std::move(msg));
|
|
return;
|
|
}
|
|
|
|
const auto& q = msg.questions[0];
|
|
auto* lookup = new PendingUnboundLookup{weak_from_this(), msg, to, from};
|
|
int err = ub_resolve_async(
|
|
unboundContext,
|
|
q.Name().c_str(),
|
|
q.qtype,
|
|
q.qclass,
|
|
(void*)lookup,
|
|
&UnboundResolver::Callback,
|
|
nullptr);
|
|
|
|
if (err != 0)
|
|
{
|
|
msg.AddServFail();
|
|
failFunc(to, from, std::move(msg));
|
|
return;
|
|
}
|
|
}
|
|
|
|
} // namespace llarp::dns
|