mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-23 14:52:24 +00:00
142 lines
4.5 KiB
C++
142 lines
4.5 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 ZeroTier Networks LLC
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*
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* This program 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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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#ifndef _ZT_PACKETDECODER_HPP
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#define _ZT_PACKETDECODER_HPP
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#include <stdexcept>
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#include "Packet.hpp"
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#include "Demarc.hpp"
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#include "InetAddress.hpp"
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#include "Utils.hpp"
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#include "SharedPtr.hpp"
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#include "AtomicCounter.hpp"
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#include "Peer.hpp"
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namespace ZeroTier {
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class RuntimeEnvironment;
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/**
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* Subclass of packet that handles the decoding of it
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*/
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class PacketDecoder : public Packet
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{
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friend class SharedPtr<PacketDecoder>;
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public:
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/**
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* Create a new packet-in-decode
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*
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* @param b Source buffer with raw packet data
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* @param localPort Local port on which packet was received
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* @param remoteAddress Address from which packet came
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* @throws std::out_of_range Range error processing packet
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*/
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template<unsigned int C2>
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PacketDecoder(const Buffer<C2> &b,Demarc::Port localPort,const InetAddress &remoteAddress)
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throw(std::out_of_range) :
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Packet(b),
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_receiveTime(Utils::now()),
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_localPort(localPort),
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_remoteAddress(remoteAddress),
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_step(DECODE_STEP_WAITING_FOR_SENDER_LOOKUP),
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__refCount()
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{
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}
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/**
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* Attempt to decode this packet
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*
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* Note that this returns 'true' if processing is complete. This says nothing
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* about whether the packet was valid. A rejection is 'complete.'
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*
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* Once true is returned, this should not be called again.
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*
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* @param _r Runtime environment
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* @return True if decoding and processing is complete, false if caller should try again
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* @throws std::out_of_range Range error processing packet (should be discarded)
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* @throws std::runtime_error Other error processing packet (should be discarded)
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*/
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bool tryDecode(const RuntimeEnvironment *_r)
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throw(std::out_of_range,std::runtime_error);
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/**
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* @return Time of packet receipt
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*/
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inline uint64_t receiveTime() const throw() { return _receiveTime; }
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private:
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struct _CBaddPeerFromHello_Data
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{
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const RuntimeEnvironment *renv;
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Address source;
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InetAddress remoteAddress;
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int localPort;
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unsigned int vMajor,vMinor,vRevision;
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uint64_t helloPacketId;
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uint64_t helloTimestamp;
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};
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static void _CBaddPeerFromHello(
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void *arg, // _CBaddPeerFromHello_Data
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const SharedPtr<Peer> &p,
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Topology::PeerVerifyResult result);
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static void _CBaddPeerFromWhois(
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void *arg, // RuntimeEnvironment
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const SharedPtr<Peer> &p,
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Topology::PeerVerifyResult result);
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// These are called internally to handle packet contents once it has
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// been authenticated, decrypted, decompressed, and classified.
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bool _doERROR(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer);
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bool _doHELLO(const RuntimeEnvironment *_r);
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bool _doOK(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer);
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bool _doWHOIS(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer);
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bool _doRENDEZVOUS(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer);
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bool _doFRAME(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer);
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bool _doMULTICAST_LIKE(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer);
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bool _doMULTICAST_FRAME(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer);
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bool _doRPC(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer);
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uint64_t _receiveTime;
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Demarc::Port _localPort;
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InetAddress _remoteAddress;
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enum {
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DECODE_STEP_WAITING_FOR_SENDER_LOOKUP, // on initial receipt, we need peer's identity
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DECODE_STEP_WAITING_FOR_ORIGINAL_SUBMITTER_LOOKUP // this only applies to MULTICAST_FRAME
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} _step;
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AtomicCounter __refCount;
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};
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} // namespace ZeroTier
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#endif
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