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102 lines
2.2 KiB
C++
102 lines
2.2 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.h>
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#include <net.hpp>
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#include <string_view.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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/// 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,
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std::function< void(Message) > sendReply) = 0;
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};
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struct Proxy
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{
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Proxy(llarp_ev_loop* loop, IQueryHandler* handler);
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bool
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Start(const llarp::Addr& addr,
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const std::vector< llarp::Addr >& resolvers);
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void
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Stop();
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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 struct sockaddr*,
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llarp_buffer_t);
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static void
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HandleUDPRecv_server(llarp_udp_io*, const struct sockaddr*,
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llarp_buffer_t);
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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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Tick(llarp_time_t now);
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void
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HandlePktClient(llarp::Addr from, llarp_buffer_t* buf);
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void
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HandlePktServer(llarp::Addr from, llarp_buffer_t* buf);
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void
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SendMessageTo(llarp::Addr to, Message msg);
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llarp::Addr
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PickRandomResolver() const;
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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* m_Loop;
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IQueryHandler* m_QueryHandler;
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std::vector< llarp::Addr > m_Resolvers;
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struct TX
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{
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MsgID_t txid;
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llarp::Addr 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 ^ llarp::Addr::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, llarp::Addr, 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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