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125 lines
2.9 KiB
C++
125 lines
2.9 KiB
C++
#ifndef LLARP_DNS_SERVER_HPP
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#define LLARP_DNS_SERVER_HPP
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#include <dns/message.hpp>
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#include <ev/ev.h>
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#include <net/net.hpp>
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#include <util/thread/logic.hpp>
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#include <dns/unbound_resolver.hpp>
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#include <unordered_map>
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namespace llarp
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{
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namespace dns
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{
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/// handler of dns query hooking
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struct IQueryHandler
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{
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virtual ~IQueryHandler() = default;
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/// return true if we should hook this message
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virtual bool
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ShouldHookDNSMessage(const Message& msg) const = 0;
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/// handle a hooked message
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virtual bool
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HandleHookedDNSMessage(Message query, std::function<void(Message)> sendReply) = 0;
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};
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struct Proxy : public std::enable_shared_from_this<Proxy>
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{
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using Logic_ptr = std::shared_ptr<Logic>;
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Proxy(
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llarp_ev_loop_ptr serverLoop,
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Logic_ptr serverLogic,
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llarp_ev_loop_ptr clientLoop,
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Logic_ptr clientLogic,
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IQueryHandler* handler);
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bool
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Start(const IpAddress& addr, const std::vector<IpAddress>& resolvers);
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void
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Stop();
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using Buffer_t = std::vector<uint8_t>;
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private:
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/// low level packet handler
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static void
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HandleUDPRecv_client(llarp_udp_io*, const SockAddr&, ManagedBuffer);
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static void
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HandleUDPRecv_server(llarp_udp_io*, const SockAddr&, ManagedBuffer);
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/// low level ticker
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static void
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HandleTick(llarp_udp_io*);
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void
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HandlePktClient(const SockAddr& from, Buffer_t buf);
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void
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HandlePktServer(const SockAddr& from, Buffer_t buf);
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void
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SendClientMessageTo(const SockAddr& to, Message msg);
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void
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SendServerMessageBufferTo(const SockAddr& to, const llarp_buffer_t& buf);
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void
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SendServerMessageTo(const SockAddr& to, Message msg);
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void
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HandleUpstreamResponse(SockAddr to, std::vector<byte_t> buf);
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void
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HandleUpstreamFailure(const SockAddr& to, Message msg);
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IpAddress
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PickRandomResolver() const;
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bool
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SetupUnboundResolver(const std::vector<IpAddress>& resolvers);
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private:
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llarp_udp_io m_Server;
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llarp_udp_io m_Client;
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llarp_ev_loop_ptr m_ServerLoop;
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llarp_ev_loop_ptr m_ClientLoop;
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Logic_ptr m_ServerLogic;
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Logic_ptr m_ClientLogic;
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IQueryHandler* m_QueryHandler;
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std::vector<IpAddress> m_Resolvers;
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std::shared_ptr<UnboundResolver> m_UnboundResolver;
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struct TX
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{
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MsgID_t txid;
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IpAddress from;
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bool
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operator==(const TX& other) const
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{
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return txid == other.txid && from == other.from;
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}
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struct Hash
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{
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size_t
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operator()(const TX& t) const noexcept
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{
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return t.txid ^ IpAddress::Hash()(t.from);
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}
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};
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};
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// maps tx to who to send reply to
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std::unordered_map<TX, IpAddress, TX::Hash> m_Forwarded;
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};
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} // namespace dns
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} // namespace llarp
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#endif
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