mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 13:07:55 +00:00
165 lines
6.3 KiB
C++
165 lines
6.3 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2015 ZeroTier, Inc.
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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_INCOMINGPACKET_HPP
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#define ZT_INCOMINGPACKET_HPP
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#include <stdexcept>
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#include "Packet.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 "MulticastGroup.hpp"
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#include "Peer.hpp"
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/*
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* The big picture:
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*
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* tryDecode gets called for a given fully-assembled packet until it returns
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* true or the packet's time to live has been exceeded, in which case it is
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* discarded as failed decode. Any exception thrown by tryDecode also causes
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* the packet to be discarded.
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*
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* Thus a return of false from tryDecode() indicates that it should be called
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* again. Logic is very simple as to when, and it's in doAnythingWaitingForPeer
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* in Switch. This might be expanded to be more fine grained in the future.
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*
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* A return value of true indicates that the packet is done. tryDecode must
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* never be called again after that.
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*/
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namespace ZeroTier {
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class RuntimeEnvironment;
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class Network;
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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 IncomingPacket : public Packet
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{
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friend class SharedPtr<IncomingPacket>;
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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 data Packet data
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* @param len Packet length
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* @param localAddress Local interface address
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* @param remoteAddress Address from which packet came
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* @param now Current time
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* @throws std::out_of_range Range error processing packet
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*/
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IncomingPacket(const void *data,unsigned int len,const InetAddress &localAddress,const InetAddress &remoteAddress,uint64_t now) :
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Packet(data,len),
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_receiveTime(now),
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_localAddress(localAddress),
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_remoteAddress(remoteAddress),
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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 must not be called again. The packet's state
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* may no longer be valid.
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*
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* @param RR 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 *RR);
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/**
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* @return Time of packet receipt / start of decode
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*/
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inline uint64_t receiveTime() const throw() { return _receiveTime; }
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/**
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* Compute the Salsa20/12+SHA512 proof of work function
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*
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* @param difficulty Difficulty in bits (max: 64)
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* @param challenge Challenge string
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* @param challengeLength Length of challenge in bytes (max allowed: ZT_PROTO_MAX_PACKET_LENGTH)
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* @param result Buffer to fill with 16-byte result
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*/
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static void computeSalsa2012Sha512ProofOfWork(unsigned int difficulty,const void *challenge,unsigned int challengeLength,unsigned char result[16]);
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/**
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* Verify the result of Salsa20/12+SHA512 proof of work
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*
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* @param difficulty Difficulty in bits (max: 64)
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* @param challenge Challenge bytes
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* @param challengeLength Length of challenge in bytes (max allowed: ZT_PROTO_MAX_PACKET_LENGTH)
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* @param proposedResult Result supplied by client
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* @return True if result is valid
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*/
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static bool testSalsa2012Sha512ProofOfWorkResult(unsigned int difficulty,const void *challenge,unsigned int challengeLength,const unsigned char proposedResult[16]);
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private:
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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 *RR,const SharedPtr<Peer> &peer);
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bool _doHELLO(const RuntimeEnvironment *RR);
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bool _doOK(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doWHOIS(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doRENDEZVOUS(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doFRAME(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doEXT_FRAME(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doECHO(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doMULTICAST_LIKE(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doNETWORK_MEMBERSHIP_CERTIFICATE(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doNETWORK_CONFIG_REQUEST(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doNETWORK_CONFIG_REFRESH(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doMULTICAST_GATHER(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doMULTICAST_FRAME(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doPUSH_DIRECT_PATHS(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doCIRCUIT_TEST(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doCIRCUIT_TEST_REPORT(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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bool _doREQUEST_PROOF_OF_WORK(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer);
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// Send an ERROR_NEED_MEMBERSHIP_CERTIFICATE to a peer indicating that an updated cert is needed to communicate
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void _sendErrorNeedCertificate(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer,uint64_t nwid);
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uint64_t _receiveTime;
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InetAddress _localAddress;
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InetAddress _remoteAddress;
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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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