lokinet/llarp/dht/messages/gotintro.cpp

#include "gotintro.hpp"

#include <llarp/service/intro.hpp>
#include <llarp/dht/context.hpp>
#include <memory>
#include <llarp/path/path_context.hpp>
#include <llarp/router/abstractrouter.hpp>
#include <llarp/routing/dht_message.hpp>
#include <llarp/tooling/dht_event.hpp>
#include <utility>

namespace llarp
{
  namespace dht
  {
    GotIntroMessage::GotIntroMessage(std::vector<service::EncryptedIntroSet> results, uint64_t tx)
        : IMessage({}), found(std::move(results)), txid(tx)
    {}

    bool
    GotIntroMessage::HandleMessage(
        llarp_dht_context* ctx, std::vector<std::unique_ptr<IMessage>>& /*replies*/) const
    {
      auto& dht = *ctx->impl;
      auto* router = dht.GetRouter();

      router->NotifyRouterEvent<tooling::GotIntroReceivedEvent>(
          router->pubkey(),
          Key_t(From.data()),
          (found.size() > 0 ? found[0] : llarp::service::EncryptedIntroSet{}),
          txid);

      for (const auto& introset : found)
      {
        if (!introset.Verify(dht.Now()))
        {
          LogWarn(
              "Invalid introset while handling direct GotIntro "
              "from ",
              From);
          return false;
        }
      }
      TXOwner owner(From, txid);

      auto serviceLookup = dht.pendingIntrosetLookups().GetPendingLookupFrom(owner);
      if (serviceLookup)
      {
        if (not found.empty())
        {
          dht.pendingIntrosetLookups().Found(owner, serviceLookup->target, found);
        }
        else
        {
          dht.pendingIntrosetLookups().NotFound(owner, nullptr);
        }
        return true;
      }
      LogError("no pending TX for GIM from ", From, " txid=", txid);
      return false;
    }

    bool
    RelayedGotIntroMessage::HandleMessage(
        llarp_dht_context* ctx,
        [[maybe_unused]] std::vector<std::unique_ptr<IMessage>>& replies) const
    {
      // TODO: implement me better?
      auto pathset = ctx->impl->GetRouter()->pathContext().GetLocalPathSet(pathID);
      if (pathset)
      {
        auto copy = std::make_shared<const RelayedGotIntroMessage>(*this);
        return pathset->HandleGotIntroMessage(copy);
      }
      LogWarn("No path for got intro message pathid=", pathID);
      return false;
    }

    bool
    GotIntroMessage::DecodeKey(const llarp_buffer_t& key, llarp_buffer_t* buf)
    {
      if (key.startswith("I"))
      {
        return BEncodeReadList(found, buf);
      }
      if (key.startswith("K"))
      {
        if (closer)  // duplicate key?
          return false;
        dht::Key_t K;
        if (not K.BDecode(buf))
          return false;
        closer = K;
        return true;
      }
      bool read = false;
      if (!BEncodeMaybeReadDictInt("T", txid, read, key, buf))
        return false;
      if (!BEncodeMaybeReadDictInt("V", version, read, key, buf))
        return false;
      return read;
    }

    bool
    GotIntroMessage::BEncode(llarp_buffer_t* buf) const
    {
      if (!bencode_start_dict(buf))
        return false;
      if (!BEncodeWriteDictMsgType(buf, "A", "G"))
        return false;
      if (!BEncodeWriteDictList("I", found, buf))
        return false;
      if (closer)
      {
        if (!BEncodeWriteDictEntry("K", *closer, buf))
          return false;
      }
      if (!BEncodeWriteDictInt("T", txid, buf))
        return false;
      if (!BEncodeWriteDictInt("V", version, buf))
        return false;
      return bencode_end(buf);
    }
  }  // namespace dht
}  // namespace llarp