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+//====== Copyright © 1996-2008, Valve Corporation, All rights reserved. =======
+//
+// Purpose: interface to steam managing network connections between game clients & servers
+//
+//=============================================================================
+
+#ifndef ISTEAMNETWORKING
+#define ISTEAMNETWORKING
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "steamtypes.h"
+#include "steamclientpublic.h"
+
+
+// list of possible errors returned by SendP2PPacket() API
+// these will be posted in the P2PSessionConnectFail_t callback
+enum EP2PSessionError
+{
+	k_EP2PSessionErrorNone = 0,
+	k_EP2PSessionErrorNotRunningApp = 1,			// target is not running the same game
+	k_EP2PSessionErrorNoRightsToApp = 2,			// local user doesn't own the app that is running
+	k_EP2PSessionErrorDestinationNotLoggedIn = 3,	// target user isn't connected to Steam
+	k_EP2PSessionErrorTimeout = 4,					// target isn't responding, perhaps not calling AcceptP2PSessionWithUser()
+													// corporate firewalls can also block this (NAT traversal is not firewall traversal)
+													// make sure that UDP ports 3478, 4379, and 4380 are open in an outbound direction
+	k_EP2PSessionErrorMax = 5
+};
+
+// SendP2PPacket() send types
+// Typically k_EP2PSendUnreliable is what you want for UDP-like packets, k_EP2PSendReliable for TCP-like packets
+enum EP2PSend
+{
+	// Basic UDP send. Packets can't be bigger than 1200 bytes (your typical MTU size). Can be lost, or arrive out of order (rare).
+	// The sending API does have some knowledge of the underlying connection, so if there is no NAT-traversal accomplished or
+	// there is a recognized adjustment happening on the connection, the packet will be batched until the connection is open again.
+	k_EP2PSendUnreliable = 0,
+
+	// As above, but if the underlying p2p connection isn't yet established the packet will just be thrown away. Using this on the first
+	// packet sent to a remote host almost guarantees the packet will be dropped.
+	// This is only really useful for kinds of data that should never buffer up, i.e. voice payload packets
+	k_EP2PSendUnreliableNoDelay = 1,
+
+	// Reliable message send. Can send up to 1MB of data in a single message. 
+	// Does fragmentation/re-assembly of messages under the hood, as well as a sliding window for efficient sends of large chunks of data. 
+	k_EP2PSendReliable = 2,
+
+	// As above, but applies the Nagle algorithm to the send - sends will accumulate 
+	// until the current MTU size (typically ~1200 bytes, but can change) or ~200ms has passed (Nagle algorithm). 
+	// Useful if you want to send a set of smaller messages but have the coalesced into a single packet
+	// Since the reliable stream is all ordered, you can do several small message sends with k_EP2PSendReliableWithBuffering and then
+	// do a normal k_EP2PSendReliable to force all the buffered data to be sent.
+	k_EP2PSendReliableWithBuffering = 3,
+
+};
+
+
+// connection state to a specified user, returned by GetP2PSessionState()
+// this is under-the-hood info about what's going on with a SendP2PPacket(), shouldn't be needed except for debuggin
+#if defined( VALVE_CALLBACK_PACK_SMALL )
+#pragma pack( push, 4 )
+#elif defined( VALVE_CALLBACK_PACK_LARGE )
+#pragma pack( push, 8 )
+#else
+#error isteamclient.h must be included
+#endif 
+struct P2PSessionState_t
+{
+	uint8 m_bConnectionActive;		// true if we've got an active open connection
+	uint8 m_bConnecting;			// true if we're currently trying to establish a connection
+	uint8 m_eP2PSessionError;		// last error recorded (see enum above)
+	uint8 m_bUsingRelay;			// true if it's going through a relay server (TURN)
+	int32 m_nBytesQueuedForSend;
+	int32 m_nPacketsQueuedForSend;
+	uint32 m_nRemoteIP;				// potential IP:Port of remote host. Could be TURN server. 
+	uint16 m_nRemotePort;			// Only exists for compatibility with older authentication api's
+};
+#pragma pack( pop )
+
+
+// handle to a socket
+typedef uint32 SNetSocket_t;		// CreateP2PConnectionSocket()
+typedef uint32 SNetListenSocket_t;	// CreateListenSocket()
+
+// connection progress indicators, used by CreateP2PConnectionSocket()
+enum ESNetSocketState
+{
+	k_ESNetSocketStateInvalid = 0,						
+
+	// communication is valid
+	k_ESNetSocketStateConnected = 1,				
+	
+	// states while establishing a connection
+	k_ESNetSocketStateInitiated = 10,				// the connection state machine has started
+
+	// p2p connections
+	k_ESNetSocketStateLocalCandidatesFound = 11,	// we've found our local IP info
+	k_ESNetSocketStateReceivedRemoteCandidates = 12,// we've received information from the remote machine, via the Steam back-end, about their IP info
+
+	// direct connections
+	k_ESNetSocketStateChallengeHandshake = 15,		// we've received a challenge packet from the server
+
+	// failure states
+	k_ESNetSocketStateDisconnecting = 21,			// the API shut it down, and we're in the process of telling the other end	
+	k_ESNetSocketStateLocalDisconnect = 22,			// the API shut it down, and we've completed shutdown
+	k_ESNetSocketStateTimeoutDuringConnect = 23,	// we timed out while trying to creating the connection
+	k_ESNetSocketStateRemoteEndDisconnected = 24,	// the remote end has disconnected from us
+	k_ESNetSocketStateConnectionBroken = 25,		// connection has been broken; either the other end has disappeared or our local network connection has broke
+
+};
+
+// describes how the socket is currently connected
+enum ESNetSocketConnectionType
+{
+	k_ESNetSocketConnectionTypeNotConnected = 0,
+	k_ESNetSocketConnectionTypeUDP = 1,
+	k_ESNetSocketConnectionTypeUDPRelay = 2,
+};
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Functions for making connections and sending data between clients,
+//			traversing NAT's where possible
+//-----------------------------------------------------------------------------
+class ISteamNetworking
+{
+public:
+	////////////////////////////////////////////////////////////////////////////////////////////
+	// Session-less connection functions
+	//    automatically establishes NAT-traversing or Relay server connections
+
+	// Sends a P2P packet to the specified user
+	// UDP-like, unreliable and a max packet size of 1200 bytes
+	// the first packet send may be delayed as the NAT-traversal code runs
+	// if we can't get through to the user, an error will be posted via the callback P2PSessionConnectFail_t
+	// see EP2PSend enum above for the descriptions of the different ways of sending packets
+	//
+	// nChannel is a routing number you can use to help route message to different systems 	- you'll have to call ReadP2PPacket() 
+	// with the same channel number in order to retrieve the data on the other end
+	// using different channels to talk to the same user will still use the same underlying p2p connection, saving on resources
+	virtual bool SendP2PPacket( CSteamID steamIDRemote, const void *pubData, uint32 cubData, EP2PSend eP2PSendType, int nChannel = 0 ) = 0;
+
+	// returns true if any data is available for read, and the amount of data that will need to be read
+	virtual bool IsP2PPacketAvailable( uint32 *pcubMsgSize, int nChannel = 0 ) = 0;
+
+	// reads in a packet that has been sent from another user via SendP2PPacket()
+	// returns the size of the message and the steamID of the user who sent it in the last two parameters
+	// if the buffer passed in is too small, the message will be truncated
+	// this call is not blocking, and will return false if no data is available
+	virtual bool ReadP2PPacket( void *pubDest, uint32 cubDest, uint32 *pcubMsgSize, CSteamID *psteamIDRemote, int nChannel = 0 ) = 0;
+
+	// AcceptP2PSessionWithUser() should only be called in response to a P2PSessionRequest_t callback
+	// P2PSessionRequest_t will be posted if another user tries to send you a packet that you haven't talked to yet
+	// if you don't want to talk to the user, just ignore the request
+	// if the user continues to send you packets, another P2PSessionRequest_t will be posted periodically
+	// this may be called multiple times for a single user
+	// (if you've called SendP2PPacket() on the other user, this implicitly accepts the session request)
+	virtual bool AcceptP2PSessionWithUser( CSteamID steamIDRemote ) = 0;
+
+	// call CloseP2PSessionWithUser() when you're done talking to a user, will free up resources under-the-hood
+	// if the remote user tries to send data to you again, another P2PSessionRequest_t callback will be posted
+	virtual bool CloseP2PSessionWithUser( CSteamID steamIDRemote ) = 0;
+
+	// call CloseP2PChannelWithUser() when you're done talking to a user on a specific channel. Once all channels
+	// open channels to a user have been closed, the open session to the user will be closed and new data from this
+	// user will trigger a P2PSessionRequest_t callback
+	virtual bool CloseP2PChannelWithUser( CSteamID steamIDRemote, int nChannel ) = 0;
+
+	// fills out P2PSessionState_t structure with details about the underlying connection to the user
+	// should only needed for debugging purposes
+	// returns false if no connection exists to the specified user
+	virtual bool GetP2PSessionState( CSteamID steamIDRemote, P2PSessionState_t *pConnectionState ) = 0;
+
+	// Allow P2P connections to fall back to being relayed through the Steam servers if a direct connection
+	// or NAT-traversal cannot be established. Only applies to connections created after setting this value,
+	// or to existing connections that need to automatically reconnect after this value is set.
+	//
+	// P2P packet relay is allowed by default
+	virtual bool AllowP2PPacketRelay( bool bAllow ) = 0;
+
+
+	////////////////////////////////////////////////////////////////////////////////////////////
+	// LISTEN / CONNECT style interface functions
+	//
+	// This is an older set of functions designed around the Berkeley TCP sockets model
+	// it's preferential that you use the above P2P functions, they're more robust
+	// and these older functions will be removed eventually
+	//
+	////////////////////////////////////////////////////////////////////////////////////////////
+
+
+	// creates a socket and listens others to connect
+	// will trigger a SocketStatusCallback_t callback on another client connecting
+	// nVirtualP2PPort is the unique ID that the client will connect to, in case you have multiple ports
+	//		this can usually just be 0 unless you want multiple sets of connections
+	// unIP is the local IP address to bind to
+	//		pass in 0 if you just want the default local IP
+	// unPort is the port to use
+	//		pass in 0 if you don't want users to be able to connect via IP/Port, but expect to be always peer-to-peer connections only
+	virtual SNetListenSocket_t CreateListenSocket( int nVirtualP2PPort, uint32 nIP, uint16 nPort, bool bAllowUseOfPacketRelay ) = 0;
+
+	// creates a socket and begin connection to a remote destination
+	// can connect via a known steamID (client or game server), or directly to an IP
+	// on success will trigger a SocketStatusCallback_t callback
+	// on failure or timeout will trigger a SocketStatusCallback_t callback with a failure code in m_eSNetSocketState
+	virtual SNetSocket_t CreateP2PConnectionSocket( CSteamID steamIDTarget, int nVirtualPort, int nTimeoutSec, bool bAllowUseOfPacketRelay ) = 0;
+	virtual SNetSocket_t CreateConnectionSocket( uint32 nIP, uint16 nPort, int nTimeoutSec ) = 0;
+
+	// disconnects the connection to the socket, if any, and invalidates the handle
+	// any unread data on the socket will be thrown away
+	// if bNotifyRemoteEnd is set, socket will not be completely destroyed until the remote end acknowledges the disconnect
+	virtual bool DestroySocket( SNetSocket_t hSocket, bool bNotifyRemoteEnd ) = 0;
+	// destroying a listen socket will automatically kill all the regular sockets generated from it
+	virtual bool DestroyListenSocket( SNetListenSocket_t hSocket, bool bNotifyRemoteEnd ) = 0;
+
+	// sending data
+	// must be a handle to a connected socket
+	// data is all sent via UDP, and thus send sizes are limited to 1200 bytes; after this, many routers will start dropping packets
+	// use the reliable flag with caution; although the resend rate is pretty aggressive,
+	// it can still cause stalls in receiving data (like TCP)
+	virtual bool SendDataOnSocket( SNetSocket_t hSocket, void *pubData, uint32 cubData, bool bReliable ) = 0;
+
+	// receiving data
+	// returns false if there is no data remaining
+	// fills out *pcubMsgSize with the size of the next message, in bytes
+	virtual bool IsDataAvailableOnSocket( SNetSocket_t hSocket, uint32 *pcubMsgSize ) = 0; 
+
+	// fills in pubDest with the contents of the message
+	// messages are always complete, of the same size as was sent (i.e. packetized, not streaming)
+	// if *pcubMsgSize < cubDest, only partial data is written
+	// returns false if no data is available
+	virtual bool RetrieveDataFromSocket( SNetSocket_t hSocket, void *pubDest, uint32 cubDest, uint32 *pcubMsgSize ) = 0; 
+
+	// checks for data from any socket that has been connected off this listen socket
+	// returns false if there is no data remaining
+	// fills out *pcubMsgSize with the size of the next message, in bytes
+	// fills out *phSocket with the socket that data is available on
+	virtual bool IsDataAvailable( SNetListenSocket_t hListenSocket, uint32 *pcubMsgSize, SNetSocket_t *phSocket ) = 0;
+
+	// retrieves data from any socket that has been connected off this listen socket
+	// fills in pubDest with the contents of the message
+	// messages are always complete, of the same size as was sent (i.e. packetized, not streaming)
+	// if *pcubMsgSize < cubDest, only partial data is written
+	// returns false if no data is available
+	// fills out *phSocket with the socket that data is available on
+	virtual bool RetrieveData( SNetListenSocket_t hListenSocket, void *pubDest, uint32 cubDest, uint32 *pcubMsgSize, SNetSocket_t *phSocket ) = 0;
+
+	// returns information about the specified socket, filling out the contents of the pointers
+	virtual bool GetSocketInfo( SNetSocket_t hSocket, CSteamID *pSteamIDRemote, int *peSocketStatus, uint32 *punIPRemote, uint16 *punPortRemote ) = 0;
+
+	// returns which local port the listen socket is bound to
+	// *pnIP and *pnPort will be 0 if the socket is set to listen for P2P connections only
+	virtual bool GetListenSocketInfo( SNetListenSocket_t hListenSocket, uint32 *pnIP, uint16 *pnPort ) = 0;
+
+	// returns true to describe how the socket ended up connecting
+	virtual ESNetSocketConnectionType GetSocketConnectionType( SNetSocket_t hSocket ) = 0;
+
+	// max packet size, in bytes
+	virtual int GetMaxPacketSize( SNetSocket_t hSocket ) = 0;
+};
+#define STEAMNETWORKING_INTERFACE_VERSION "SteamNetworking005"
+
+// callbacks
+#if defined( VALVE_CALLBACK_PACK_SMALL )
+#pragma pack( push, 4 )
+#elif defined( VALVE_CALLBACK_PACK_LARGE )
+#pragma pack( push, 8 )
+#else
+#error isteamclient.h must be included
+#endif 
+
+// callback notification - a user wants to talk to us over the P2P channel via the SendP2PPacket() API
+// in response, a call to AcceptP2PPacketsFromUser() needs to be made, if you want to talk with them
+struct P2PSessionRequest_t
+{ 
+	enum { k_iCallback = k_iSteamNetworkingCallbacks + 2 };
+	CSteamID m_steamIDRemote;			// user who wants to talk to us
+};
+
+
+// callback notification - packets can't get through to the specified user via the SendP2PPacket() API
+// all packets queued packets unsent at this point will be dropped
+// further attempts to send will retry making the connection (but will be dropped if we fail again)
+struct P2PSessionConnectFail_t
+{ 
+	enum { k_iCallback = k_iSteamNetworkingCallbacks + 3 };
+	CSteamID m_steamIDRemote;			// user we were sending packets to
+	uint8 m_eP2PSessionError;			// EP2PSessionError indicating why we're having trouble
+};
+
+
+// callback notification - status of a socket has changed
+// used as part of the CreateListenSocket() / CreateP2PConnectionSocket() 
+struct SocketStatusCallback_t
+{ 
+	enum { k_iCallback = k_iSteamNetworkingCallbacks + 1 };
+	SNetSocket_t m_hSocket;				// the socket used to send/receive data to the remote host
+	SNetListenSocket_t m_hListenSocket;	// this is the server socket that we were listening on; NULL if this was an outgoing connection
+	CSteamID m_steamIDRemote;			// remote steamID we have connected to, if it has one
+	int m_eSNetSocketState;				// socket state, ESNetSocketState
+};
+
+#pragma pack( pop )
+
+#endif // ISTEAMNETWORKING