204 lines
10 KiB
C++
204 lines
10 KiB
C++
//
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// Copyright 2020 Electronic Arts Inc.
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//
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// TiberianDawn.DLL and RedAlert.dll and corresponding source code is free
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// software: you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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// TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed
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// in the hope that it will be useful, but with permitted additional restrictions
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// under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT
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// distributed with this program. You should have received a copy of the
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// GNU General Public License along with permitted additional restrictions
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// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
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/* $Header: /CounterStrike/IPXGCONN.H 1 3/03/97 10:24a Joe_bostic $ */
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/***************************************************************************
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** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S **
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***************************************************************************
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* *
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* Project Name : Command & Conquer *
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* *
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* File Name : IPXGCONN.H *
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* *
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* Programmer : Bill Randolph *
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* *
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* Start Date : December 19, 1994 *
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* *
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* Last Update : April 11, 1995 [BR] *
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* *
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*-------------------------------------------------------------------------*
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* *
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* This class is a special type of IPX Connection. It can talk to more *
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* than one system at a time. It can Broadcast packets to all systems, *
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* or send a packet to one individual system. The packets it sends to *
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* individual systems can be DATA_NOACK or DATA_ACK packets, but the *
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* packets broadcast have to be DATA_NOACK packets. This class is for *
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* only the crudest "Who-are-you" type of network communications. Once *
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* the IPX Address of another system is identified, a "real" IPX *
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* Connection should be created, & further communications done through it. *
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* *
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* This means that the packet ID field no longer can be used to detect *
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* resends, since the receive queue may receive a lot more packets than *
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* we send out. So, re-sends cannot be detected; the application must be *
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* designed so that it can handle multiple copies of the same packet. *
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* *
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* The class uses a slightly different header from the normal Connections; *
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* this header includes the ProductID of the sender, so multiple *
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* applications can share the same socket, but by using different product *
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* ID's, can distinguish between their own packets & others. *
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* *
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* Because of this additional header, and because Receive ACK/Retry logic *
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* is different (we can't detect resends), the following routines are *
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* overloaded: *
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* Send_Packet: must embed the product ID into the packet header *
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* Receive_Packet: must detect resends via the LastAddress & *
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* LastPacketID arrays. This class doesn't ACK *
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* packets until Service_Receive_Queue is called; *
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* the parent classes ACK the packet when it's *
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* received. *
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* Get_Packet: extracts the product ID from the header; *
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* doesn't care about reading packets in order *
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* Send is capable of broadcasting the packet, or sending *
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* to a specific address *
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* *
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* This class also has the ability to cross a Novell Network Bridge. *
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* You provide the class with the bridge address, and subsequent *
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* broadcasts are sent across the bridge as well as to the local network. *
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* Address-specific sends contain the destination network's address, *
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* so they cross a bridge automatically; it's just the broadcasts *
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* that need to know the bridge address. *
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* *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#ifndef IPXGLOBALCONN_H
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#define IPXGLOBALCONN_H
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#include "ipxconn.h"
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/*
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********************************** Defines **********************************
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*/
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//---------------------------------------------------------------------------
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// This is the header for Global Connection messages. It includes the usual
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// "standard" header that the other connections do; but it also includes an
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// IPX address field, so the application can get the address of the sender
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// of this message. This address field must be provided in by the IPX
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// Connection Manager class, when it calls this class's Receive_Packet
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// function.
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//---------------------------------------------------------------------------
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typedef struct {
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CommHeaderType Header;
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unsigned short ProductID;
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} GlobalHeaderType;
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/*
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***************************** Class Declaration *****************************
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*/
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class IPXGlobalConnClass : public IPXConnClass
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{
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//------------------------------------------------------------------------
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// Public Interface
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//------------------------------------------------------------------------
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public:
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//.....................................................................
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// Some useful enums:
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//.....................................................................
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enum GlobalConnectionEnum {
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//..................................................................
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// This is the magic number for all Global Connections. Having the
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// same magic number across products lets us ID different products
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// on the net. If you change the fundamental connection protocol,
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// you must use a different magic number.
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//..................................................................
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//GLOBAL_MAGICNUM = 0x1234, // used for C&C 1
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GLOBAL_MAGICNUM = 0x1235, // used for C&C 0
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//..................................................................
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// These are the values used for the ProductID field in the Global
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// Message structure. It also should be the Magic Number used for
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// the private connections within that product.
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// This list should be continually updated & kept current. Never
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// ever ever use an old product ID for your product!
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//..................................................................
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COMMAND_AND_CONQUER = 0xaa01,
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COMMAND_AND_CONQUER0 = 0xaa00
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};
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//.....................................................................
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// Constructor/destructor.
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//.....................................................................
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IPXGlobalConnClass (int numsend, int numrecieve, int maxlen,
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unsigned short product_id);
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virtual ~IPXGlobalConnClass () {};
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//.....................................................................
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// Send/Receive routines.
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//.....................................................................
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virtual int Send_Packet (void * buf, int buflen,
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IPXAddressClass *address, int ack_req);
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virtual int Receive_Packet (void * buf, int buflen,
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IPXAddressClass *address);
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virtual int Get_Packet (void * buf, int *buflen,
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IPXAddressClass *address, unsigned short *product_id);
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//.....................................................................
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// This is for telling the connection it can cross a bridge.
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//.....................................................................
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void Set_Bridge (NetNumType bridge);
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//.....................................................................
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// The Product ID for this product.
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//.....................................................................
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unsigned short ProductID;
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//.....................................................................
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// This describes the address of a bridge we have to cross. This class
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// supports crossing only one bridge. Storing the bridge's network
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// number allows us to obtain its local target address only once, then
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// re-use it.
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//.....................................................................
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NetNumType BridgeNet;
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NetNodeType BridgeNode;
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int IsBridge;
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//------------------------------------------------------------------------
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// Protected Interface
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//------------------------------------------------------------------------
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protected:
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//.....................................................................
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// This is the overloaded Send routine declared in ConnectionClass, and
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// used in SequencedConnClass. This special version sends to the address
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// stored in the extra buffer within the Queue.
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//.....................................................................
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virtual int Send (char *buf, int buflen, void *extrabuf, int extralen);
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//.....................................................................
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// This routine is overloaded from SequencedConnClass, because the
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// Global Connection needs to ACK its packets differently from the
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// other connections.
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//.....................................................................
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virtual int Service_Receive_Queue (void);
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private:
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//.....................................................................
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// Since we can't detect resends by using the PacketID (since we're
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// receiving packets from a variety of sources, all using different
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// ID's), we'll have to remember the last 'n' packet addresses & id's
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// for comparison purposes.
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// Note that, if network traffic is heavy, it's still possible for an
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// app to receive the same packet twice!
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//.....................................................................
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IPXAddressClass LastAddress[4]; // array of last 4 addresses
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unsigned long LastPacketID[4]; // array of last 4 packet ID's
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int LastRXIndex; // index of next avail pos
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};
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#endif
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/*************************** end of ipxgconn.h *****************************/
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