Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//====== Copyright Valve Corporation, All rights reserved. ====================
//
// Purpose: A low level API similar to Berkeley socket, to send messages
// between hosts over the Steam network and addressed using Steam IDs.
//
//=============================================================================
#ifndef ISTEAMNETWORKINGSOCKETS
#define ISTEAMNETWORKINGSOCKETS
#ifdef _WIN32
#pragma once
#endif
#include "steamnetworkingtypes.h"
// #KLUDGE! This is so we don't have to link with steam_api.lib
#include <steam/steam_api.h>
#include <steam/steam_gameserver.h>
//-----------------------------------------------------------------------------
/// Lower level networking interface that more closely mirrors the standard
/// Berkeley sockets model. Sockets are hard! You should probably only use
/// this interface under the existing circumstances:
///
/// - You have an existing socket-based codebase you want to port, or coexist with.
/// - You want to be able to connect based on IP address, rather than (just) Steam ID.
/// - You need low-level control of bandwidth utilization, when to drop packets, etc.
///
/// Note that neither of the terms "connection" and "socket" will correspond
/// one-to-one with an underlying UDP socket. An attempt has been made to
/// keep the semantics as similar to the standard socket model when appropriate,
/// but some deviations do exist.
class ISteamSocketNetworking
{
public:
/// Creates a "server" socket that listens for clients to connect to, either by calling
/// ConnectSocketBySteamID or ConnectSocketByIPv4Address.
///
/// nSteamConnectVirtualPort specifies how clients can connect to this socket using
/// ConnectBySteamID. A negative value indicates that this functionality is
/// disabled and clients must connect by IP address. It's very common for applications
/// to only have one listening socket; in that case, use zero. If you need to open
/// multiple listen sockets and have clients be able to connect to one or the other, then
/// nSteamConnectVirtualPort should be a small integer constant unique to each listen socket
/// you create.
///
/// If you want clients to connect to you by your IPv4 addresses using
/// ConnectByIPv4Address, then you must set nPort to be nonzero. Steam will
/// bind a UDP socket to the specified local port, and clients will send packets using
/// ordinary IP routing. It's up to you to take care of NAT, protecting your server
/// from DoS, etc. If you don't need clients to connect to you by IP, then set nPort=0.
/// Use nIP if you wish to bind to a particular local interface. Typically you will use 0,
/// which means to listen on all interfaces, and accept the default outbound IP address.
/// If nPort is zero, then nIP must also be zero.
///
/// A SocketStatusCallback_t callback when another client attempts a connection.
virtual HSteamListenSocket CreateListenSocket( int nSteamConnectVirtualPort, uint32 nIP, uint16 nPort ) = 0;
/// Creates a connection and begins talking to a remote destination. The remote host
/// must be listening with the appropriate call to CreateListenSocket.
///
/// Use ConnectBySteamID to connect using the SteamID (client or game server) as the network address.
/// Use ConnectByIPv4Address to connect by IP address.
///
/// On success, a SocketStatusCallback_t callback is triggered.
/// On failure or timeout, a SocketStatusCallback_t callback with a failure code in m_eSNetSocketState
virtual HSteamNetConnection ConnectBySteamID( CSteamID steamIDTarget, int nVirtualPort, int nTimeoutSec ) = 0;
virtual HSteamNetConnection ConnectByIPv4Address( uint32 nIP, uint16 nPort, int nTimeoutSec ) = 0;
/// Accept an incoming connection that has been received on a listen socket.
///
/// When a connection attempt is received (perhaps after a few basic handshake
/// packets have been exchanged to prevent trivial spoofing), a connection interface
/// object is created in the k_ESteamNetworkingConnectionState_Connecting state
/// and a SteamNetConnectionStatusChangedCallback_t is posted. At this point, your
/// application MUST either accept or close the connection. (It may not ignore it.)
/// Accepting the connection will transition it into the connected state.
///
/// You should take action within a few seconds, because accepting the connection is
/// what actually sends the reply notifying the client that they are connected. If you
/// delay taking action, from the client's perspective it is the same as the network
/// being unresponsive, and the client may timeout the connection attempt. In other
/// words, the client cannot distinguish between a delay caused by network problems
/// and a delay caused by the application.
///
/// This means that if your application goes for more than a few seconds without
/// processing callbacks, then there is a chance that a client may attempt to connect
/// in that interval, and timeout.
///
/// If the application does not respond to the connection attempt in a timely manner,
/// and we stop receiving communication from the client, the connection attempt will
/// be timed out locally, transitioning the connection to the
/// k_ESteamNetworkingConnectionState_ProblemDetectedLocally state. The client may also
/// close the connection before it is accepted and a transition to the
/// k_ESteamNetworkingConnectionState_ClosedByPeer is also possible.
///
/// Returns k_EResultInvalidParam if the handle is invalid.
/// Returns k_EResultInvalidState if the connection is not in the appropriate state.
/// (Remember that the connection state could change in between the time that the
/// notification being posted to the queue and when it is received by the application.)
virtual EResult AcceptConnection( HSteamNetConnection hConn ) = 0;
/// Disconnects from the remote host and invalidates the connection handle.
/// Any unread data on the connection is discarded.
///
/// nReason is an application defined code that will be received on the other
/// end and recorded (when possible) in backend analytics. The value should
/// come from a restricted range. (See ESteamNetConnectionEnd.) If you don't need
/// to communicate any information to the remote host, and do not want analytics to
/// be able to distinguish "normal" connection terminations from "exceptional" ones,
/// You may pass zero, in which case the generic value of
/// k_ESteamNetConnectionEnd_App_Generic will be used.
///
/// pszDebug is an optional human-readable diagnostic string that will be received
/// by the remote host and recorded (when possible) in backend analytics.
///
/// If you wish to put the socket into a "linger" state, where an attempt is made to
/// flush any remaining sent data, use bEnableLinger=true. Otherwise reliable data
/// is not flushed.
///
/// If the connection has already ended and you are just freeing up the
/// connection interface, the reason code, debug string, and linger flag are
/// ignored.
virtual bool CloseConnection( HSteamNetConnection hPeer, int nReason, const char *pszDebug, bool bEnableLinger ) = 0;
/// Destroy a listen socket, and all the client sockets generated by accepting connections
/// on the listen socket.
///
/// pszNotifyRemoteReason determines what cleanup actions are performed on the client
/// sockets being destroyed. (See DestroySocket for more details.)
///
/// Note that if cleanup is requested and you have requested the listen socket bound to a
/// particular local port to facilitate direct UDP/IPv4 connections, then the underlying UDP
/// socket must remain open until all clients have been cleaned up.
virtual bool CloseListenSocket( HSteamListenSocket hSocket, const char *pszNotifyRemoteReason ) = 0;
/// Set connection user data. Returns false if the handle is invalid.
virtual bool SetConnectionUserData( HSteamNetConnection hPeer, int64 nUserData ) = 0;
/// Fetch connection user data. Returns -1 if handle is invalid
/// or if you haven't set any userdata on the connection.
virtual int64 GetConnectionUserData( HSteamNetConnection hPeer ) = 0;
/// Set a name for the connection, used mostly for debugging
virtual void SetConnectionName( HSteamNetConnection hPeer, const char *pszName ) = 0;
/// Fetch connection user data. Returns -1 if handle is invalid
/// or if you haven't set any userdata on the connection.
virtual void GetConnectionName( HSteamNetConnection hPeer, char *ppszName, int nMaxLen ) = 0;
/// Send a message to the remote host on the connected socket.
///
/// eSendType determines the delivery guarantees that will be provided,
/// when data should be buffered, etc.
///
/// Note that the semantics we use for messages are not precisely
/// the same as the semantics of a standard "stream" socket.
/// (SOCK_STREAM) For an ordinary stream socket, the boundaries
/// between chunks are not considered relevant, and the sizes of
/// the chunks of data written will not necessarily match up to
/// the sizes of the chunks that are returned by the reads on
/// the other end. The remote host might read a partial chunk,
/// or chunks might be coalesced. For the message semantics
/// used here, however, the sizes WILL match. Each send call
/// will match a successful read call on the remote host
/// one-for-one. If you are porting existing stream-oriented
/// code to the semantics of reliable messages, your code should
/// work the same, since reliable message semantics are more
/// strict than stream semantics. The only caveat is related to
/// performance: there is per-message overhead to retain the
/// messages sizes, and so if your code sends many small chunks
/// of data, performance will suffer. Any code based on stream
/// sockets that does not write excessively small chunks will
/// work without any changes.
virtual EResult SendMessageToConnection( HSteamNetConnection hConn, const void *pData, uint32 cbData, ESteamNetworkingSendType eSendType ) = 0;
/// Fetch the next available message(s) from the socket, if any.
/// Returns the number of messages returned into your array, up to nMaxMessages.
/// If the connection handle is invalid, -1 is returned.
///
/// The order of the messages returned in the array is relevant.
/// Reliable messages will be received in the order they were sent (and with the
/// same sizes --- see SendMessageToConnection for on this subtle difference from a stream socket).
///
/// FIXME - We're still debating the exact set of guarantees for unreliable, so this might change.
/// Unreliable messages may not be received. The order of delivery of unreliable messages
/// is NOT specified. They may be received out of order with respect to each other or
/// reliable messages. They may be received multiple times!
///
/// If any messages are returned, you MUST call Release() to each of them free up resources
/// after you are done. It is safe to keep the object alive for a little while (put it
/// into some queue, etc), and you may call Release() from any thread.
virtual int ReceiveMessagesOnConnection( HSteamNetConnection hConn, ISteamNetworkingMessage **ppOutMessages, int nMaxMessages ) = 0;
/// Same as ReceiveMessagesOnConnection, but will return the next message available
/// on any client socket that was accepted through the specified listen socket. Use
/// ISteamNetworkingMessage::GetConnection to know which client connection.
///
/// Delivery order of messages among different clients is not defined. They may
/// be returned in an order different from what they were actually received. (Delivery
/// order of messages from the same client is well defined, and thus the order of the
/// messages is relevant!)
virtual int ReceiveMessagesOnListenSocket( HSteamListenSocket hSocket, ISteamNetworkingMessage **ppOutMessages, int nMaxMessages ) = 0;
/// Returns information about the specified connection.
virtual bool GetConnectionInfo( HSteamNetConnection hConn, SteamNetConnectionInfo_t *pInfo ) = 0;
/// Returns brief set of connection status that you might want to display
/// to the user in game.
virtual bool GetQuickConnectionStatus( HSteamNetConnection hConn, SteamNetworkingQuickConnectionStatus *pStats ) = 0;
/// Returns detailed connection stats in text format. Useful
/// for dumping to a log, etc.
///
/// Returns:
/// -1 failure (bad connection handle)
/// 0 OK, your buffer was filled in and '\0'-terminated
/// >0 Your buffer was either nullptr, or it was too small and the text got truncated. Try again with a buffer of at least N bytes.
virtual int GetDetailedConnectionStatus( HSteamNetConnection hConn, char *pszBuf, int cbBuf ) = 0;
/// Returns information about the listen socket.
///
/// *pnIP and *pnPort will be 0 if the socket is set to listen for connections based
/// on SteamID only. If your listen socket accepts connections on IPv4, then both
/// fields will return nonzero, even if you originally passed a zero IP. However,
/// note that the address returned may be a private address (e.g. 10.0.0.x or 192.168.x.x),
/// and may not be reachable by a general host on the Internet.
virtual bool GetListenSocketInfo( HSteamListenSocket hSocket, uint32 *pnIP, uint16 *pnPort ) = 0;
//
// Special SDR connections involved with servers hosted in Valve data centers
//
virtual bool SetHostedDedicatedServerCertificate( const void *pCert, int cbCert, void *pPrivateKey, int cbPrivateKey ) = 0;
virtual HSteamListenSocket CreateHostedDedicatedServerListenSocket( uint16 nPort ) = 0;
virtual HSteamNetConnection ConnectToHostedDedicatedServer( CSteamID steamIDTarget ) = 0;
//
// Gets some debug text from the connection
//
virtual bool GetConnectionDebugText( HSteamNetConnection hConn, char *pOut, int nOutCCH ) = 0;
//
// Set and get configuration values, see ESteamNetworkingConfigurationValue for individual descriptions.
//
// Returns the value or -1 is eConfigValue is invalid
virtual int32 GetConfigurationValue( ESteamNetworkingConfigurationValue eConfigValue ) = 0;
// Returns true if successfully set
virtual bool SetConfigurationValue( ESteamNetworkingConfigurationValue eConfigValue, int32 nValue ) = 0;
// Return the name of an int configuration value, or NULL if config value isn't known
virtual const char *GetConfigurationValueName( ESteamNetworkingConfigurationValue eConfigValue ) = 0;
//
// Set and get configuration strings, see ESteamNetworkingConfigurationString for individual descriptions.
//
// Get the configuration string, returns length of string needed if pDest is nullpr or destSize is 0
// returns -1 if the eConfigValue is invalid
virtual int32 GetConfigurationString( ESteamNetworkingConfigurationString eConfigString, char *pDest, int32 destSize ) = 0;
virtual bool SetConfigurationString( ESteamNetworkingConfigurationString eConfigString, const char *pString ) = 0;
// Return the name of a string configuration value, or NULL if config value isn't known
virtual const char *GetConfigurationStringName( ESteamNetworkingConfigurationString eConfigString ) = 0;
};
#define STEAMSOCKETNETWORKING_VERSION "SteamSocketNetworking001"
// Notification struct used to notify when a connection has changed state
struct SteamNetConnectionStatusChangedCallback_t
{
HSteamNetConnection m_hConn; //< Connection handle
SteamNetConnectionInfo_t m_info; //< Full connection info
int m_eOldState; //< ESNetSocketState. (Current stats is in m_info)
};
// Temporary global accessor. This will be moved to steam_api.h
STEAMDATAGRAMLIB_INTERFACE ISteamSocketNetworking *SteamSocketNetworking();
typedef void * ( S_CALLTYPE *FSteamInternal_CreateInterface )( const char *);
typedef void ( S_CALLTYPE *FSteamAPI_RegisterCallResult)( class CCallbackBase *pCallback, SteamAPICall_t hAPICall );
typedef void ( S_CALLTYPE *FSteamAPI_UnregisterCallResult)( class CCallbackBase *pCallback, SteamAPICall_t hAPICall );
/// !KLUDGE! Glue code that will go away when we move everything into
/// the ISteamNetwork interfaces
STEAMDATAGRAMLIB_INTERFACE void SteamDatagramClient_Internal_SteamAPIKludge( FSteamAPI_RegisterCallResult fnRegisterCallResult, FSteamAPI_UnregisterCallResult fnUnregisterCallResult );
STEAMDATAGRAMLIB_INTERFACE bool SteamDatagramClient_Init_Internal( const char *pszCacheDirectory, /* ESteamDatagramPartner */ int ePartner, int iPartnerMask, SteamDatagramErrMsg &errMsg, ISteamClient *pClient, HSteamUser hSteamUser, HSteamPipe hSteamPipe );
inline bool SteamDatagramClient_Init( const char *pszCacheDirectory, /* ESteamDatagramPartner */ int ePartner, int iPartnerMask, SteamDatagramErrMsg &errMsg )
{
SteamDatagramClient_Internal_SteamAPIKludge( &::SteamAPI_RegisterCallResult, &::SteamAPI_UnregisterCallResult );
return SteamDatagramClient_Init_Internal( pszCacheDirectory, ePartner, iPartnerMask, errMsg, ::SteamClient(), ::SteamAPI_GetHSteamUser(), ::SteamAPI_GetHSteamPipe() );
}
/// Shutdown all clients and close all sockets
STEAMDATAGRAMLIB_INTERFACE void SteamDatagramClient_Kill();
/// Initialize the game server interface
STEAMDATAGRAMLIB_INTERFACE bool SteamDatagramServer_Init_Internal( SteamDatagramErrMsg &errMsg, ISteamClient *pClient, HSteamUser hSteamUser, HSteamPipe hSteamPipe );
// KLUDGE TF is using an old version of the SDK, which doesn't have this. TF doesn't need this, so just comment it out.
// We'll need to upgrade the Steamworks SDK if we want to actually use SDR
//inline bool SteamDatagramServer_Init( SteamDatagramErrMsg &errMsg )
//{
// SteamDatagramClient_Internal_SteamAPIKludge( &::SteamAPI_RegisterCallResult, &::SteamAPI_UnregisterCallResult );
// return SteamDatagramServer_Init_Internal( errMsg, ::SteamGameServerClient(), ::SteamGameServer_GetHSteamUser(), ::SteamGameServer_GetHSteamPipe() );
//}
/// Shutdown the game server interface
STEAMDATAGRAMLIB_INTERFACE void SteamDatagramServer_Kill( );
// !KLUDGE! Check for connections that have changed status, and post callbacks.
// This is temporary we can hook this up using the ordinary steam CCallback mechanism
typedef void (*FSteamNetConnectionStatusChangedCallback)( SteamNetConnectionStatusChangedCallback_t *pInfo );
STEAMDATAGRAMLIB_INTERFACE void Temp_DispatchsSteamNetConnectionStatusChangedCallbacks( FSteamNetConnectionStatusChangedCallback fnCallback );
enum ESteamDatagramDebugOutputType
{
k_ESteamDatagramDebugOutputType_None,
k_ESteamDatagramDebugOutputType_Error,
k_ESteamDatagramDebugOutputType_Important, // Nothing is wrong, but this is an important notification
k_ESteamDatagramDebugOutputType_Warning,
k_ESteamDatagramDebugOutputType_Msg, // Recommended amount
k_ESteamDatagramDebugOutputType_Verbose, // Quite a bit
k_ESteamDatagramDebugOutputType_Debug, // Practically everything
};
/// Setup callback for debug output, and the desired verbosity you want.
typedef void (*FSteamDatagramDebugOutput)( /* ESteamDatagramDebugOutputType */ int nType, const char *pszMsg );
STEAMDATAGRAMLIB_INTERFACE void SteamDatagram_SetDebugOutputFunction( /* ESteamDatagramDebugOutputType */ int eDetailLevel, FSteamDatagramDebugOutput pfnFunc );
#endif // ISTEAMNETWORKINGSOCKETS