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89 lines
2.2 KiB
C++
89 lines
2.2 KiB
C++
#pragma once
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#include "message.hpp"
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#include <llarp/ev/ev.hpp>
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#include <llarp/net/net.hpp>
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#include "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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class IQueryHandler
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{
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public:
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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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// Base class for DNS lookups
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class PacketHandler : public std::enable_shared_from_this<PacketHandler>
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{
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public:
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explicit PacketHandler(EventLoop_ptr loop, IQueryHandler* handler);
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virtual ~PacketHandler() = default;
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virtual bool
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Start(SockAddr localaddr, std::vector<IpAddress> upstreamResolvers);
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void
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Stop();
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void
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Restart();
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void
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HandlePacket(const SockAddr& resolver, const SockAddr& from, llarp_buffer_t buf);
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bool
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ShouldHandlePacket(const SockAddr& to, const SockAddr& from, llarp_buffer_t buf) const;
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protected:
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virtual void
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SendServerMessageBufferTo(const SockAddr& from, const SockAddr& to, llarp_buffer_t buf) = 0;
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private:
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void
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HandleUpstreamFailure(const SockAddr& from, const SockAddr& to, Message msg);
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bool
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SetupUnboundResolver(std::vector<IpAddress> resolvers);
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IQueryHandler* const m_QueryHandler;
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std::set<IpAddress> m_Resolvers;
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std::shared_ptr<UnboundResolver> m_UnboundResolver;
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EventLoop_ptr m_Loop;
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};
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// Proxying DNS handler that listens on a UDP port for proper DNS requests.
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class Proxy : public PacketHandler
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{
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public:
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explicit Proxy(EventLoop_ptr loop, IQueryHandler* handler);
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bool
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Start(SockAddr localaddr, std::vector<IpAddress> resolvers) override;
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protected:
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void
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SendServerMessageBufferTo(
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const SockAddr& from, const SockAddr& to, llarp_buffer_t buf) override;
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private:
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std::shared_ptr<UDPHandle> m_Server;
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EventLoop_ptr m_Loop;
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};
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} // namespace dns
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} // namespace llarp
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