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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2017 ZeroTier, Inc. https://www.zerotier.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial closed-source software that incorporates or links
* directly against ZeroTier software without disclosing the source code
* of your own application.
*/
#ifndef ZT_INCOMINGPACKET_HPP
#define ZT_INCOMINGPACKET_HPP
#include <stdexcept>
#include "Packet.hpp"
#include "Path.hpp"
#include "Utils.hpp"
#include "MulticastGroup.hpp"
#include "Peer.hpp"
/*
* The big picture:
*
* tryDecode gets called for a given fully-assembled packet until it returns
* true or the packet's time to live has been exceeded, in which case it is
* discarded as failed decode. Any exception thrown by tryDecode also causes
* the packet to be discarded.
*
* Thus a return of false from tryDecode() indicates that it should be called
* again. Logic is very simple as to when, and it's in doAnythingWaitingForPeer
* in Switch. This might be expanded to be more fine grained in the future.
*
* A return value of true indicates that the packet is done. tryDecode must
* never be called again after that.
*/
namespace ZeroTier {
class RuntimeEnvironment;
class Network;
/**
* Subclass of packet that handles the decoding of it
*/
class IncomingPacket : public Packet
{
public:
IncomingPacket() :
Packet(),
_receiveTime(0)
{
}
/**
* Create a new packet-in-decode
*
* @param data Packet data
* @param len Packet length
* @param path Path over which packet arrived
* @param now Current time
* @throws std::out_of_range Range error processing packet
*/
IncomingPacket(const void *data,unsigned int len,const SharedPtr<Path> &path,uint64_t now) :
Packet(data,len),
_receiveTime(now),
_path(path)
{
}
/**
* Init packet-in-decode in place
*
* @param data Packet data
* @param len Packet length
* @param path Path over which packet arrived
* @param now Current time
* @throws std::out_of_range Range error processing packet
*/
inline void init(const void *data,unsigned int len,const SharedPtr<Path> &path,uint64_t now)
{
copyFrom(data,len);
_receiveTime = now;
_path = path;
}
/**
* Attempt to decode this packet
*
* Note that this returns 'true' if processing is complete. This says nothing
* about whether the packet was valid. A rejection is 'complete.'
*
* Once true is returned, this must not be called again. The packet's state
* may no longer be valid.
*
* @param RR Runtime environment
* @param tPtr Thread pointer to be handed through to any callbacks called as a result of this call
* @return True if decoding and processing is complete, false if caller should try again
*/
bool tryDecode(const RuntimeEnvironment *RR,void *tPtr);
/**
* @return Time of packet receipt / start of decode
*/
inline uint64_t receiveTime() const { return _receiveTime; }
private:
// These are called internally to handle packet contents once it has
// been authenticated, decrypted, decompressed, and classified.
bool _doERROR(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doHELLO(const RuntimeEnvironment *RR,void *tPtr,const bool alreadyAuthenticated);
bool _doOK(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doWHOIS(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doRENDEZVOUS(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doFRAME(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doEXT_FRAME(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doECHO(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doMULTICAST_LIKE(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doNETWORK_CREDENTIALS(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doNETWORK_CONFIG_REQUEST(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doNETWORK_CONFIG(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doMULTICAST_GATHER(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doMULTICAST_FRAME(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doPUSH_DIRECT_PATHS(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doUSER_MESSAGE(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
bool _doREMOTE_TRACE(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer);
void _sendErrorNeedCredentials(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr<Peer> &peer,const uint64_t nwid);
uint64_t _receiveTime;
SharedPtr<Path> _path;
};
} // namespace ZeroTier
#endif
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