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133 lines
4.5 KiB
133 lines
4.5 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 "RLPXSocket.h"
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#include "RLPXFrameCoder.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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/**
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* @brief Setup inbound or outbound connection for communication over RLPXFrameCoder.
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* RLPx Spec: https://github.com/ethereum/devp2p/blob/master/rlpx.md#encrypted-handshake
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*
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* @todo Implement StartSession transition via lambda which is passed to constructor.
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*
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* Thread Safety
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* Distinct Objects: Safe.
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* Shared objects: Unsafe.
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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 RLPXFrameCoder;
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/// Sequential states of handshake
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enum State
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{
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Error = -1,
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New,
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AckAuth,
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WriteHello,
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ReadHello,
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StartSession
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};
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public:
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/// Setup incoming connection.
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RLPXHandshake(Host* _host, std::shared_ptr<RLPXSocket> const& _socket): m_host(_host), m_originated(false), m_socket(_socket), m_idleTimer(m_socket->ref().get_io_service()) { crypto::Nonce::get().ref().copyTo(m_nonce.ref()); }
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/// Setup outbound connection.
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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), m_idleTimer(m_socket->ref().get_io_service()) { crypto::Nonce::get().ref().copyTo(m_nonce.ref()); }
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~RLPXHandshake() {}
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/// Start handshake.
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void start() { transition(); }
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/// Cancels handshake preventing
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void cancel() { m_cancel = true; m_socket->close(); }
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protected:
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/// Write Auth message to socket and transitions to AckAuth.
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void writeAuth();
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/// Reads Auth message from socket and transitions to AckAuth.
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void readAuth();
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/// Write Ack message to socket and transitions to WriteHello.
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void writeAck();
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/// Reads Auth message from socket and transitions to WriteHello.
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void readAck();
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/// Closes connection and ends transitions.
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void error();
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/// Performs transition for m_nextState.
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void transition(boost::system::error_code _ech = boost::system::error_code());
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/// Timeout for remote to respond to transition events. Enforced by m_idleTimer and refreshed by transition().
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boost::posix_time::milliseconds const c_timeout = boost::posix_time::milliseconds(1800);
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State m_nextState = New; ///< Current or expected state of transition.
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bool m_cancel = false; ///< Will be set to true if connection was canceled.
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Host* m_host; ///< Host which provides m_alias, protocolVersion(), m_clientVersion, caps(), and TCP listenPort().
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/// Node id of remote host for socket.
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NodeId m_remote; ///< Public address of remote host.
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bool m_originated = false; ///< True if connection is outbound.
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/// Buffers for encoded and decoded handshake phases
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bytes m_auth; ///< Plaintext of egress or ingress Auth message.
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bytes m_authCipher; ///< Ciphertext of egress or ingress Auth message.
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bytes m_ack; ///< Plaintext of egress or ingress Ack message.
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bytes m_ackCipher; ///< Ciphertext of egress or ingress Ack message.
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bytes m_handshakeOutBuffer; ///< Frame buffer for egress Hello packet.
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bytes m_handshakeInBuffer; ///< Frame buffer for ingress Hello packet.
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crypto::ECDHE m_ecdhe; ///< Ephemeral ECDH secret and agreement.
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h256 m_nonce; ///< Nonce generated by this host for handshake.
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Public m_remoteEphemeral; ///< Remote ephemeral public key.
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h256 m_remoteNonce; ///< Nonce generated by remote host for handshake.
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/// Used to read and write RLPx encrypted frames for last step of handshake authentication.
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/// Passed onto Host which will take ownership.
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RLPXFrameCoder* m_io = nullptr;
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std::shared_ptr<RLPXSocket> m_socket; ///< Socket.
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boost::asio::deadline_timer m_idleTimer; ///< Timer which enforces c_timeout.
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};
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}
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}
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