src/network/serveropcodes.cpp

/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#pragma once

#include "irrlichttypes_bloated.h"
#include "peerhandler.h"
#include "socket.h"
#include "constants.h"
#include "util/pointer.h"
#include "util/container.h"
#include "util/thread.h"
#include "util/numeric.h"
#include "networkprotocol.h"
#include <iostream>
#include <fstream>
#include <list>
#include <map>

class NetworkPacket;

namespace con
{

class ConnectionReceiveThread;
class ConnectionSendThread;

typedef enum MTProtocols {
	MTP_PRIMARY,
	MTP_UDP,
	MTP_MINETEST_RELIABLE_UDP
} MTProtocols;

#define MAX_UDP_PEERS 65535

#define SEQNUM_MAX 65535

inline bool seqnum_higher(u16 totest, u16 base)
{
	if (totest > base)
	{
		if ((totest - base) > (SEQNUM_MAX/2))
			return false;

		return true;
	}

	if ((base - totest) > (SEQNUM_MAX/2))
		return true;

	return false;
}

inline bool seqnum_in_window(u16 seqnum, u16 next,u16 window_size)
{
	u16 window_start = next;
	u16 window_end   = ( next + window_size ) % (SEQNUM_MAX+1);

	if (window_start < window_end) {
		return ((seqnum >= window_start) && (seqnum < window_end));
	}


	return ((seqnum < window_end) || (seqnum >= window_start));
}

static inline float CALC_DTIME(u64 lasttime, u64 curtime)
{
	float value = ( curtime - lasttime) / 1000.0;
	return MYMAX(MYMIN(value,0.1),0.0);
}

struct BufferedPacket
{
	BufferedPacket(u8 *a_data, u32 a_size):
		data(a_data, a_size)
	{}
	BufferedPacket(u32 a_size):
		data(a_size)
	{}
	Buffer<u8> data; // Data of the packet, including headers
	float time = 0.0f; // Seconds from buffering the packet or re-sending
	float totaltime = 0.0f; // Seconds from buffering the packet
	u64 absolute_send_time = -1;
	Address address; // Sender or destination
	unsigned int resend_count = 0;
};

// This adds the base headers to the data and makes a packet out of it
BufferedPacket makePacket(Address &address, SharedBuffer<u8> data,
		u32 protocol_id, session_t sender_peer_id, u8 channel);

// Depending on size, make a TYPE_ORIGINAL or TYPE_SPLIT packet
// Increments split_seqnum if a split packet is made
void makeAutoSplitPacket(SharedBuffer<u8> data, u32 chunksize_max,
		u16 &split_seqnum, std::list<SharedBuffer<u8>> *list);

// Add the TYPE_RELIABLE header to the data
SharedBuffer<u8> makeReliablePacket(SharedBuffer<u8> data, u16 seqnum);

struct IncomingSplitPacket
{
	IncomingSplitPacket(u32 cc, bool r):
		chunk_count(cc), reliable(r) {}

	IncomingSplitPacket() = delete;

	// Key is chunk number, value is data without headers
	std::map<u16, SharedBuffer<u8>> chunks;
	u32 chunk_count;
	float time = 0.0f; // Seconds from adding
	bool reliable = false; // If true, isn't deleted on timeout

	bool allReceived() const
	{
		return (chunks.size() == chunk_count);
	}
};

/*
=== NOTES ===

A packet is sent through a channel to a peer with a basic header:
TODO: Should we have a receiver_peer_id also?
	Header (7 bytes):
	[0] u32 protocol_id
	[4] session_t sender_peer_id
	[6] u8 channel
sender_peer_id:
	Unique to each peer.
	value 0 (PEER_ID_INEXISTENT) is reserved for making new connections
	value 1 (PEER_ID_SERVER) is reserved for server
	these constants are defined in constants.h
channel:
	The lower the number, the higher the priority is.
	Only channels 0, 1 and 2 exist.
*/
#define BASE_HEADER_SIZE 7
#define CHANNEL_COUNT 3
/*
Packet types:

CONTROL: This is a packet used by the protocol.
- When this is processed, nothing is handed to the user.
	Header (2 byte):
	[0] u8 type
	[1] u8 controltype
controltype and data description:
	CONTROLTYPE_ACK
		[2] u16 seqnum
	CONTROLTYPE_SET_PEER_ID
		[2] session_t peer_id_new
	CONTROLTYPE_PING
	- There is no actual reply, but this can be sent in a reliable
	  packet to get a reply
	CONTROLTYPE_DISCO
*/
//#define TYPE_CONTROL 0
#define CONTROLTYPE_ACK 0
#define CONTROLTYPE_SET_PEER_ID 1
#define CONTROLTYPE_PING 2
#define CONTROLTYPE_DISCO 3
#define CONTROLTYPE_ENABLE_BIG_SEND_WINDOW 4

/*
ORIGINAL: This is a plain packet with no control and no error
checking at all.
- When this is processed, it is directly handed to the user.
	Header (1 byte):
	[0] u8 type
*/
//#define TYPE_ORIGINAL 1
#define ORIGINAL_HEADER_SIZE 1
/*
SPLIT: These are sequences of packets forming one bigger piece of
data.
- When processed and all the packet_nums 0...packet_count-1 are
  present (this should be buffered), the resulting data shall be
  directly handed to the user.
- If the data fails to come up in a reasonable time, the buffer shall
  be silently discarded.
- These can be sent as-is or atop of a RELIABLE packet stream.
	Header (7 bytes):
	[0] u8 type
	[1] u16 seqnum
	[3] u16 chunk_count
	[5] u16 chunk_num
*/
//#define TYPE_SPLIT 2
/*
RELIABLE: Delivery of all RELIABLE packets shall be forced by ACKs,
and they shall be delivered in the same order as sent. This is done
with a buffer in the receiving and transmitting end.
- When this is processed, the contents of each packet is recursively
  processed as packets.
	Header (3 bytes):
	[0] u8 type
	[1] u16 seqnum

*/
//#define TYPE_RELIABLE 3
#define RELIABLE_HEADER_SIZE 3
#define SEQNUM_INITIAL 65500

enum PacketType: u8 {
	PACKET_TYPE_CONTROL = 0,
	PACKET_TYPE_ORIGINAL = 1,
	PACKET_TYPE_SPLIT = 2,
	PACKET_TYPE_RELIABLE = 3,
	PACKET_TYPE_MAX
};
/*
	A buffer which stores reliable packets and sorts them internally
	for fast access to the smallest one.
*/

typedef std::list<BufferedPacket>::iterator RPBSearchResult;

class ReliablePacketBuffer
{
public:
	ReliablePacketBuffer() = default;

	bool getFirstSeqnum(u16& result);

	BufferedPacket popFirst();
	BufferedPacket popSeqnum(u16 seqnum);
	void insert(BufferedPacket &p,u16 next_expected);

	void incrementTimeouts(float dtime);
	std::list<BufferedPacket> getTimedOuts(float timeout,
			unsigned int max_packets);

	void print();
	bool empty();
	bool containsPacket(u16 seqnum);
	RPBSearchResult notFound();
	u32 size();


private:
	RPBSearchResult findPacket(u16 seqnum);

	std::list<BufferedPacket> m_list;
	u32 m_list_size = 0;

	u16 m_oldest_non_answered_ack;

	std::mutex m_list_mutex;
};

/*
	A buffer for reconstructing split packets
*/

class IncomingSplitBuffer
{
public:
	~IncomingSplitBuffer();
	/*
		Returns a reference counted buffer of length != 0 when a full split
		packet is constructed. If not, returns one of length 0.
	*/
	SharedBuffer<u8> insert(const BufferedPacket &p, bool reliable);

	void removeUnreliableTimedOuts(float dtime, float timeout);

private:
	// Key is seqnum
	std::map<u16, IncomingSplitPacket*> m_buf;

	std::mutex m_map_mutex;
};

struct OutgoingPacket
{
	session_t peer_id;
	u8 channelnum;
	SharedBuffer<u8> data;
	bool reliable;
	bool ack;

	OutgoingPacket(session_t peer_id_, u8 channelnum_, const SharedBuffer<u8> &data_,
			bool reliable_,bool ack_=false):
		peer_id(peer_id_),
		channelnum(channelnum_),
		data(data_),
		reliable(reliable_),
		ack(ack_)
	{
	}
};

enum ConnectionCommandType{
	CONNCMD_NONE,
	CONNCMD_SERVE,
	CONNCMD_CONNECT,
	CONNCMD_DISCONNECT,
	CONNCMD_DISCONNECT_PEER,
	CONNCMD_SEND,
	CONNCMD_SEND_TO_ALL,
	CONCMD_ACK,
	CONCMD_CREATE_PEER,
	CONCMD_DISABLE_LEGACY
};

struct ConnectionCommand
{
	enum ConnectionCommandType type = CONNCMD_NONE;
	Address address;
	session_t peer_id = PEER_ID_INEXISTENT;
	u8 channelnum = 0;
	Buffer<u8> data;
	bool reliable = false;
	bool raw = false;

	ConnectionCommand() = default;
	ConnectionCommand &operator=(const ConnectionCommand &other)
	{
		type = other.type;
		address = other.address;
		peer_id = other.peer_id;
		channelnum = other.channelnum;
		// We must copy the buffer here to prevent race condition
		data = SharedBuffer<u8>(*other.data, other.data.getSize());
		reliable = other.reliable;
		raw = other.raw;
		return *this;
	}

	void serve(Address address_)
	{
		type = CONNCMD_SERVE;
		address = address_;
	}
	void connect(Address address_)
	{
		type = CONNCMD_CONNECT;
		address = address_;
	}
	void disconnect()
	{
		type = CONNCMD_DISCONNECT;
	}
	void disconnect_peer(session_t peer_id_)
	{
		type = CONNCMD_DISCONNECT_PEER;
		peer_id = peer_id_;
	}

	void send(session_t peer_id_, u8 channelnum_, NetworkPacket *pkt, bool reliable_);

	void ack(session_t peer_id_, u8 channelnum_, const SharedBuffer<u8> &data_)
	{
		type = CONCMD_ACK;
		peer_id = peer_id_;
		channelnum = channelnum_;
		data = data_;
		reliable = false;
	}

	void createPeer(session_t peer_id_, const SharedBuffer<u8> &data_)
	{
		type = CONCMD_CREATE_PEER;
		peer_id = peer_id_;
		data = data_;
		channelnum = 0;
		reliable = true;
		raw = true;
	}

	void disableLegacy(session_t peer_id_, const SharedBuffer<u8> &data_)
	{
		type = CONCMD_DISABLE_LEGACY;
		peer_id = peer_id_;
		data = data_;
		channelnum = 0;
		reliable = true;
		raw = true;
	}
};

/* maximum window size to use, 0xFFFF is theoretical maximum  don't think about
 * touching it, the less you're away from it the more likely data corruption
 * will occur
 */
#define MAX_RELIABLE_WINDOW_SIZE 0x8000
	/* starting value for window size */
#define MIN_RELIABLE_WINDOW_SIZE 0x40

class Channel
{

public:
	u16 readNextIncomingSeqNum();
	u16 incNextIncomingSeqNum();

	u16 getOutgoingSequenceNumber(bool& successfull);
	u16 readOutgoingSequenceNumber();
	bool putBackSequenceNumber(u16);

	u16 readNextSplitSeqNum();
	void setNextSplitSeqNum(u16 seqnum);

	// This is for buffering the incoming packets that are coming in
	// the wrong order
	ReliablePacketBuffer incoming_reliables;
	// This is for buffering the sent packets so that the sender can
	// re-send them if no ACK is received
	ReliablePacketBuffer outgoing_reliables_sent;

	//queued reliable packets
	std::queue<BufferedPacket> queued_reliables;

	//queue commands prior splitting to packets
	std::deque<ConnectionCommand> queued_commands;

	IncomingSplitBuffer incoming_splits;

	Channel() = default;
	~Channel() = default;

	void UpdatePacketLossCounter(unsigned int count);
	void UpdatePacketTooLateCounter();
	void UpdateBytesSent(unsigned int bytes,unsigned int packages=1);
	void UpdateBytesLost(unsigned int bytes);
	void UpdateBytesReceived(unsigned int bytes);

	void UpdateTimers(float dtime, bool legacy_peer);

	const float getCurrentDownloadRateKB()
		{ MutexAutoLock lock(m_internal_mutex); return cur_kbps; };
	const float getMaxDownloadRateKB()
		{ MutexAutoLock lock(m_internal_mutex); return max_kbps; };

	const float getCurrentLossRateKB()
		{ MutexAutoLock lock(m_internal_mutex); return cur_kbps_lost; };
	const float getMaxLossRateKB()
		{ MutexAutoLock lock(m_internal_mutex); return max_kbps_lost; };

	const float getCurrentIncomingRateKB()
		{ MutexAutoLock lock(m_internal_mutex); return cur_incoming_kbps; };
	const float getMaxIncomingRateKB()
		{ MutexAutoLock lock(m_internal_mutex); return max_incoming_kbps; };

	const float getAvgDownloadRateKB()
		{ MutexAutoLock lock(m_internal_mutex); return avg_kbps; };
	const float getAvgLossRateKB()
		{ MutexAutoLock lock(m_internal_mutex); return avg_kbps_lost; };
	const float getAvgIncomingRateKB()
		{ MutexAutoLock lock(m_internal_mutex); return avg_incoming_kbps; };

	const unsigned int getWindowSize() const { return window_size; };

	void setWindowSize(unsigned int size) { window_size = size; };
private:
	std::mutex m_internal_mutex;
	int window_size = MIN_RELIABLE_WINDOW_SIZE;

	u16 next_incoming_seqnum = SEQNUM_INITIAL;

	u16 next_outgoing_seqnum = SEQNUM_INITIAL;
	u16 next_outgoing_split_seqnum = SEQNUM_INITIAL;

	unsigned int current_packet_loss = 0;
	unsigned int current_packet_too_late = 0;
	unsigned int current_packet_successfull = 0;
	float packet_loss_counter = 0.0f;

	unsigned int current_bytes_transfered = 0;
	unsigned int current_bytes_received = 0;
	unsigned int current_bytes_lost = 0;
	float max_kbps = 0.0f;
	float cur_kbps = 0.0f;
	float avg_kbps = 0.0f;
	float max_incoming_kbps = 0.0f;
	float cur_incoming_kbps = 0.0f;
	float avg_incoming_kbps = 0.0f;
	float max_kbps_lost = 0.0f;
	float cur_kbps_lost = 0.0f;
	float avg_kbps_lost = 0.0f;
	float bpm_counter = 0.0f;

	unsigned int rate_samples = 0;
};

class Peer;

class PeerHelper
{
public:
	PeerHelper() = default;
	PeerHelper(Peer* peer);
	~PeerHelper();

	PeerHelper&   operator=(Peer* peer);
	Peer*         operator->() const;
	bool          operator!();
	Peer*         operator&() const;
	bool          operator!=(void* ptr);

private:
	Peer *m_peer = nullptr;
};

class Connection;

typedef enum {
	CUR_DL_RATE,
	AVG_DL_RATE,
	CUR_INC_RATE,
	AVG_INC_RATE,
	CUR_LOSS_RATE,
	AVG_LOSS_RATE,
} rate_stat_type;

class Peer {
	public:
		friend class PeerHelper;

		Peer(Address address_,u16 id_,Connection* connection) :
			id(id_),
			m_connection(connection),
			address(address_),
			m_last_timeout_check(porting::getTimeMs())
		{
		};

		virtual ~Peer() {
			MutexAutoLock usage_lock(m_exclusive_access_mutex);
			FATAL_ERROR_IF(m_usage != 0, "Reference counting failure");
		};

		// Unique id of the peer
		u16 id;

		void Drop();

		virtual void PutReliableSendCommand(ConnectionCommand &c,
						unsigned int max_packet_size) {};

		virtual bool getAddress(MTProtocols type, Address& toset) = 0;

		bool isPendingDeletion()
		{ MutexAutoLock lock(m_exclusive_access_mutex); return m_pending_deletion; };

		void ResetTimeout()
			{MutexAutoLock lock(m_exclusive_access_mutex); m_timeout_counter = 0.0; };

		bool isTimedOut(float timeout);

		unsigned int m_increment_packets_remaining = 9;
		unsigned int m_increment_bytes_remaining = 0;

		virtual u16 getNextSplitSequenceNumber(u8 channel) { return 0; };
		virtual void setNextSplitSequenceNumber(u8 channel, u16 seqnum) {};
		virtual SharedBuffer<u8> addSplitPacket(u8 channel, const BufferedPacket &toadd,
				bool reliable)
		{
			fprintf(stderr,"Peer: addSplitPacket called, this is supposed to be never called!\n");
			return SharedBuffer<u8>(0);
		};

		virtual bool Ping(float dtime, SharedBuffer<u8>& data) { return false; };

		virtual float getStat(rtt_stat_type type) const {
			switch (type) {
				case MIN_RTT:
					return m_rtt.min_rtt;
				case MAX_RTT:
					return m_rtt.max_rtt;
				case AVG_RTT:
					return m_rtt.avg_rtt;
				case MIN_JITTER:
					return m_rtt.jitter_min;
				case MAX_JITTER:
					return m_rtt.jitter_max;
				case AVG_JITTER:
					return m_rtt.jitter_avg;
			}
			return -1;
		}
	protected:
		virtual void reportRTT(float rtt) {};

		void RTTStatistics(float rtt,
							const std::string &profiler_id = "",
							unsigned int num_samples = 1000);

		bool IncUseCount();
		void DecUseCount();

		std::mutex m_exclusive_access_mutex;

		bool m_pending_deletion = false;

		Connection* m_connection;

		// Address of the peer
		Address address;

		// Ping timer
		float m_ping_timer = 0.0f;
	private:

		struct rttstats {
			float jitter_min = FLT_MAX;
			float jitter_max = 0.0f;
			float jitter_avg = -1.0f;
			float min_rtt = FLT_MAX;
			float max_rtt = 0.0f;
			float avg_rtt = -1.0f;

			rttstats() = default;
		};

		rttstats m_rtt;
		float m_last_rtt = -1.0f;

		// current usage count
		unsigned int m_usage = 0;

		// Seconds from last receive
		float m_timeout_counter = 0.0f;

		u64 m_last_timeout_check;
};

class UDPPeer : public Peer
{
public:

	friend class PeerHelper;
	friend class ConnectionReceiveThread;
	friend class ConnectionSendThread;
	friend class Connection;

	UDPPeer(u16 a_id, Address a_address, Connection* connection);
	virtual ~UDPPeer() = default;

	void PutReliableSendCommand(ConnectionCommand &c,
							unsigned int max_packet_size);

	bool getAddress(MTProtocols type, Address& toset);

	void setNonLegacyPeer();

	bool getLegacyPeer()
	{ return m_legacy_peer; }

	u16 getNextSplitSequenceNumber(u8 channel);
	void setNextSplitSequenceNumber(u8 channel, u16 seqnum);

	SharedBuffer<u8> addSplitPacket(u8 channel, const BufferedPacket &toadd,
		bool reliable);

protected:
	/*
		Calculates avg_rtt and resend_timeout.
		rtt=-1 only recalculates resend_timeout
	*/
	void reportRTT(float rtt);

	void RunCommandQueues(
					unsigned int max_packet_size,
					unsigned int maxcommands,
					unsigned int maxtransfer);

	float getResendTimeout()
		{ MutexAutoLock lock(m_exclusive_access_mutex); return resend_timeout; }

	void setResendTimeout(float timeout)
		{ MutexAutoLock lock(m_exclusive_access_mutex); resend_timeout = timeout; }
	bool Ping(float dtime,SharedBuffer<u8>& data);

	Channel channels[CHANNEL_COUNT];
	bool m_pending_disconnect = false;
private:
	// This is changed dynamically
	float resend_timeout = 0.5;

	bool processReliableSendCommand(
					ConnectionCommand &c,
					unsigned int max_packet_size);

	bool m_legacy_peer = true;
};

/*
	Connection
*/

enum ConnectionEventType{
	CONNEVENT_NONE,
	CONNEVENT_DATA_RECEIVED,
	CONNEVENT_PEER_ADDED,
	CONNEVENT_PEER_REMOVED,
	CONNEVENT_BIND_FAILED,
};

struct ConnectionEvent
{
	enum ConnectionEventType type = CONNEVENT_NONE;
	session_t peer_id = 0;
	Buffer<u8> data;
	bool timeout = false;
	Address address;

	ConnectionEvent() = default;

	std::string describe()
	{
		switch(type) {
		case CONNEVENT_NONE:
			return "CONNEVENT_NONE";
		case CONNEVENT_DATA_RECEIVED:
			return "CONNEVENT_DATA_RECEIVED";
		case CONNEVENT_PEER_ADDED:
			return "CONNEVENT_PEER_ADDED";
		case CONNEVENT_PEER_REMOVED:
			return "CONNEVENT_PEER_REMOVED";
		case CONNEVENT_BIND_FAILED:
			return "CONNEVENT_BIND_FAILED";
		}
		return "Invalid ConnectionEvent";
	}

	void dataReceived(session_t peer_id_, const SharedBuffer<u8> &data_)
	{
		type = CONNEVENT_DATA_RECEIVED;
		peer_id = peer_id_;
		data = data_;
	}
	void peerAdded(session_t peer_id_, Address address_)
	{
		type = CONNEVENT_PEER_ADDED;
		peer_id = peer_id_;
		address = address_;
	}
	void peerRemoved(session_t peer_id_, bool timeout_, Address address_)
	{
		type = CONNEVENT_PEER_REMOVED;
		peer_id = peer_id_;
		timeout = timeout_;
		address = address_;
	}
	void bindFailed()
	{
		type = CONNEVENT_BIND_FAILED;
	}
};

class PeerHandler;

class Connection
{
public:
	friend class ConnectionSendThread;
	friend class ConnectionReceiveThread;

	Connection(u32 protocol_id, u32 max_packet_size, float timeout, bool ipv6,
			PeerHandler *peerhandler);
	~Connection();

	/* Interface */
	ConnectionEvent waitEvent(u32 timeout_ms);
	void putCommand(ConnectionCommand &c);

	void SetTimeoutMs(u32 timeout) { m_bc_receive_timeout = timeout; }
	void Serve(Address bind_addr);
	void Connect(Address address);
	bool Connected();
	void Disconnect();
	void Receive(NetworkPacket* pkt);
	void Send(session_t peer_id, u8 channelnum, NetworkPacket *pkt, bool reliable);
	session_t GetPeerID() const { return m_peer_id; }
	Address GetPeerAddress(session_t peer_id);
	float getPeerStat(session_t peer_id, rtt_stat_type type);
	float getLocalStat(rate_stat_type type);
	const u32 GetProtocolID() const { return m_protocol_id; };
	const std::string getDesc();
	void DisconnectPeer(session_t peer_id);

protected:
	PeerHelper getPeerNoEx(session_t peer_id);
	u16   lookupPeer(Address& sender);

	u16 createPeer(Address& sender, MTProtocols protocol, int fd);
	UDPPeer*  createServerPeer(Address& sender);
	bool deletePeer(session_t peer_id, bool timeout);

	void SetPeerID(session_t id) { m_peer_id = id; }

	void sendAck(session_t peer_id, u8 channelnum, u16 seqnum);

	void PrintInfo(std::ostream &out);

	std::list<session_t> getPeerIDs()
	{
		MutexAutoLock peerlock(m_peers_mutex);
		return m_peer_ids;
	}

	UDPSocket m_udpSocket;
	MutexedQueue<ConnectionCommand> m_command_queue;

	void putEvent(ConnectionEvent &e);

	void TriggerSend();
private:
	MutexedQueue<ConnectionEvent> m_event_queue;

	session_t m_peer_id = 0;
	u32 m_protocol_id;

	std::map<session_t, Peer *> m_peers;
	std::list<session_t> m_peer_ids;
	std::mutex m_peers_mutex;

	std::unique_ptr<ConnectionSendThread> m_sendThread;
	std::unique_ptr<ConnectionReceiveThread> m_receiveThread;

	std::mutex m_info_mutex;

	// Backwards compatibility
	PeerHandler *m_bc_peerhandler;
	u32 m_bc_receive_timeout = 0;

	bool m_shutting_down = false;

	session_t m_next_remote_peer_id = 2;
};

} // namespace
	Commit message (Collapse)	Author	Age
*	Send only changed node metadata to clients instead of whole mapblock (#5268)	SmallJoker	2018-12-04
\| \| \| \| \| \| \|	Includes newer style changes and fixes by est31 Improve the block position de-serialization Add type NodeMetadataMap
*	Rename CSM flavours to restrictions	SmallJoker	2018-06-26
\| \| \| \|	& Satisfy LINT
*	Add formspec theming using prepended strings	Andrew Ward	2018-03-28
\|
*	Implement mod communication channels (#6351)	Loïc Blot	2017-09-26
\| \| \| \| \| \| \| \| \| \|	Implement network communication for channels * Implement ModChannel manager server side to route incoming messages from clients to other clients * Add signal handler switch on client & ModChannelMgr on client to handle channels * Add Lua API bindings + client packet sending + unittests * Implement server message sending * Add callback from received message handler to Lua API using registration method
*	Network: Remove large parts of deprecated legacy code (#6404)	SmallJoker	2017-09-12
\| \| \| \|	Also remove the setting 'send_pre_v25_init' Keep old enum entries for obsolete commands
*	[CSM] Add flavour limits controlled by server (#5930)	Loïc Blot	2017-07-18
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	* [CSM] Add flavour limits controlled by server Server send flavour limits to client permitting to disable or limit some Lua calls * Add limits for reading nodedefs and itemdefs * flavour: Add lookup node limits * Merge get_node_or_nil into get_node. Sending fake node doesn't make sense in CSM, just return nil if node is not available for any reason * Add node range customization when noderange flavour is enabled (default 8 nodes) * Limit nodes range & disable chat message sending by default * Bump protocol version
*	Chat protocol rewrite (#5117)	Loïc Blot	2017-07-16
\| \| \| \| \| \| \| \| \| \| \| \| \|	* New TOCLIENT_CHAT_MESSAGE packet * Rename old packet to TOCLIENT_CHAT_MESSAGE_OLD for compat * Handle TOCLIENT_CHAT_MESSAGE new structure client side * Client chat queue should use a specific object * SendChatMessage: use the right packet depending on protocol version (not complete yet) * Add chatmessage(type) objects and handle them client side (partially) * Use ChatMessage instead of std::wstring server side * Update with timestamp support
*	Have the server send the player list to the client (#5924)	red-001	2017-06-08
\| \| \| \| \|	* Have the server send the player list to the client Currently the client generates the player list based on the Client active object list, the issue with this is that we can't be sure all player active objects will be sent to the client, so this could result in players showing up when someone run `/status` but auto complete not working with their nick and CSM not being aware of the player
*	Add missing server sending rule for bd921a7916f0fafc493b1c4d0eeb5e2bb1d6a7c2	Loic Blot	2017-05-05
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*	Add clouds API	Ben Deutsch	2017-04-30
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*	Fix #5655 (#5658)	red-001	2017-04-26
\| \| \| \|	Client: Don't send `TOSERVER_RECEIVED_MEDIA` since it's not used anymore Server: Handle `TOSERVER_RECEIVED_MEDIA` using `Server::handleCommand_Deprecated`
*	Network:Remove old opcodes and fix documentation. (#5573)	red-001	2017-04-22
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*	Breath cheat fix: server side	Loic Blot	2017-01-01
\| \| \| \| \| \| \| \| \|	Breath is now handled server side. Changing this behaviour required some modifications to core: * Ignore TOSERVER_BREATH package, marking it as obsolete * Clients doesn't send the breath to server anymore * Use PlayerSAO pointer instead of peer_id in Server::SendPlayerBreath to prevent a useless lookup (little perf gain) * drop a useless static_cast in emergePlayer
*	Finalize init packets and enable protocol v25	est31	2015-05-16
\| \| \| \|	This enables srp.
*	Make early protocol auth mechanism generic, and add SRP	est31	2015-05-11
\| \| \| \| \| \| \|	Adds everything needed for SRP (and everything works too), but still deactivated, as protocol v25 init packets aren't final yet. Can be activated by changing the LATEST_PROTOCOL_VERSION header to 25 inside networkprotocol.h.
*	Prepare Protocol v25 init & authentication.	Loic Blot	2015-03-13
\| \| \| \| \| \| \| \| \| \|	* TOSERVER_INIT and TOCLIENT_INIT renamed to _LEGACY * TOSERVER_PASSWORD merged from dev-0.5, can use protocol v24 and v25 * TOCLIENT_ACCESS_DENIED merged from dev-0.5, can use protocol v24 and v25, with normalized strings an a custom id for custom errors * new TOSERVER_INIT packet only send MT version, supported compressions, protocols and serialization, this permit to rework everything later without break the _INIT packet * new TOSERVER_AUTH packet which auth the client * new TOCLIENT_HELLO packet which send server serialization version atm * new TOCLIENT_AUTH_ACCEPTED which is send when TOCLIENT_AUTH was okay. After this packet, the client load datas from servers, like after TOCLIENT_INIT_LEGACY packet
*	Handle the newly added TOCLIENT_ACCESS_DENIED and ↵	Loic Blot	2015-03-13
\| \| \| \| \| \| \|	TOCLIENT_DELETE_PARTICLESPAWNER * Rename the handlers from _Legacy to regular, because here we can use same handlers * Fix some packet names and pseudo handlers
*	Rename some packet and handlers to <packet>_Legacy name for compat layer ↵	Loic Blot	2015-03-13
\| \| \| \|	between new network changes and old network clients
*	[Patch 2/4] Network rework: packet writing, sending and cleanups	Loic Blot	2015-02-16
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	NetworkPacket.cpp: * Remove some deprecated functions, we must use streaming interface * m_data converted from u8* to std::vector<u8> * Add an exporter to forge packet to Connection object * implement operator << std::wstring. n * implement operator << std::string * dynamic resize when write packet content. * fix string writing and performances. * create ServerCommandFactory, used by client to get useful informations about packet processing (sending). * Reliability * Transmit channel * Implement putRawString for some ugly char (_INIT packet), and use it. * Many packet read and write migrated * Implement oldForgePacket to interface writing with current connection * fix U8/char/bool writing * fix string writing and performances. * add some missing functions * Use v3s16 read instead of reading x,y,z separately * Add irr::video::SColor support into packets * Add some missing handlers * Add a template function to increase offset * Throw a serialization error on packet reading (must be improved) PacketFactories: * Create ServerCommandFactory, used by client to get useful informations about packet processing (sending). * Create ClientCommandFactory, used by server to get useful informations about packet processing (sending). Client.cpp: * implement NetworkPacket ::Send interface. * Move packet handlers to a dedicated file * Remove Client::Send(SharedBuffer) Server.cpp: * implement NetworkPacket ::Send interface. * Rewrite all packets using NetworkPacket * Move packet handlers to a dedicated file * Remove Server::Send(SharedBuffer) ClientIface.cpp: * Remove sendToAll(SharedBuffer<u8>) Connection.hpp rework: * Remove duplicate include * Remove duplicate negation * Remove a useless variable * Improve code performance by using a m_peers_list instead of scanning m_peers map * Remove Connection::Send(SharedBuffer) * Fix useafterfree into NetworkPacket Sending * Remove unused Connection::sendToAll Test.cpp: * Remove dead code * Update tests to use NetworkPackets Misc: * add new wrappers to Send packets in client, using NetworkPacket * Add NetworkPacket methods for Connection * coding style fix * dead code since changes cleanup * Use v3s16 read instead of reading x,y,z separately in some packets * Use different files to handle packets received by client and server * Cleanup: Remove useless includes ok @Zeno- Tested by @Zeno- @VanessaE and @nerzhul on running servers
*	Network Layer 7 rework (Packet handling)	Loic Blot	2015-02-10
	* Move networkcode to a dedicated directory * Rename clientserver.h to network/networkprotocol.h (Better name) and sanitize some includes * Create object NetworkPacket * It stores command (opcode) and data separated * It also stores peer_id * Data reading can be done by using a streaming interface * Change packet routing analysis * Remove old conditional analysis * Now uses function pointed analysis and add connection state ({Client,Server}::handlers) * Connection state permit to categorize condition to handle before analyze packets * Create a handler for depreciated messages, instead of duplicating code