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102 lines
2.7 KiB
102 lines
2.7 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file RLPXHandshake.h
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* @author Alex Leverington <nessence@gmail.com>
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* @date 2015
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*/
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#pragma once
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#include <memory>
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#include <libdevcrypto/Common.h>
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#include <libdevcrypto/ECDHE.h>
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#include <libdevcrypto/CryptoPP.h>
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#include "RLPxFrameIO.h"
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#include "Common.h"
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namespace ba = boost::asio;
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namespace bi = boost::asio::ip;
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namespace dev
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{
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namespace p2p
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{
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class RLPXHandshake: public std::enable_shared_from_this<RLPXHandshake>
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{
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friend class RLPXFrameIO;
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enum State
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{
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Error = -1,
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New, // New->AckAuth [egress: tx auth, ingress: rx auth]
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AckAuth, // AckAuth->WriteHello [egress: rx ack, ingress: tx ack]
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WriteHello, // WriteHello [tx caps, rx caps, writehello]
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ReadHello,
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StartSession
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};
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public:
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/// Handshake for ingress connection. Takes ownership of socket.
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RLPXHandshake(Host* _host, std::shared_ptr<RLPXSocket> const& _socket): m_host(_host), m_originated(false), m_socket(_socket) { crypto::Nonce::get().ref().copyTo(m_nonce.ref()); }
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/// Handshake for egress connection to _remote. Takes ownership of socket.
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RLPXHandshake(Host* _host, std::shared_ptr<RLPXSocket> const& _socket, NodeId _remote): m_host(_host), m_remote(_remote), m_originated(true), m_socket(_socket) { crypto::Nonce::get().ref().copyTo(m_nonce.ref()); }
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~RLPXHandshake() {}
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void start() { transition(); }
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protected:
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void writeAuth();
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void readAuth();
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void writeAck();
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void readAck();
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void error();
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void transition(boost::system::error_code _ech = boost::system::error_code());
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/// Current state of handshake.
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State m_nextState = New;
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Host* m_host;
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/// Node id of remote host for socket.
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NodeId m_remote;
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bool m_originated = false;
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/// Buffers for encoded and decoded handshake phases
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bytes m_auth;
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bytes m_authCipher;
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bytes m_ack;
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bytes m_ackCipher;
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bytes m_handshakeOutBuffer;
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bytes m_handshakeInBuffer;
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crypto::ECDHE m_ecdhe;
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h256 m_nonce;
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Public m_remoteEphemeral;
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h256 m_remoteNonce;
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/// Frame IO is used to read frame for last step of handshake authentication.
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RLPXFrameIO* m_io;
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std::shared_ptr<RLPXSocket> m_socket;
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};
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}
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}
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