README.md · feirnova/d2gs

本项目Fork于：https://github.com/RElesgoe/d2gs.git  
D2GS 1.13c来源于：http://www.pvpgn.pl/d2gs/  
D2GS 1.13d来源于：marsgod  
本人只是做了整合、汇总、以及编译调试环境的开发，尽量简化了整个开发调试的过程，并且提供了完整详细的《编译说明.doc》，同时兼容1.13c和1.13d两个版本。

在此一并表示由衷的感谢，具体编译过程请仔细阅读《编译说明.doc》。

# Diablo II Game Server (D2GS)
This repository contains changes to [pvpgn/d2gs109](https://github.com/pvpgn/d2gs109) to make it compatible the with current d2cs-d2gs protocol and with recent versions of `D2Server.dll`.

Compile with Visual Studio 2019 in *Debug* mode and run the resulting binary using compatibility mode for *Windows 8*.

## How Does D2GS Work
The game server application loads `D2Server.dll`, calls `QueryInterface()`, and then calls the start function using one of the function pointers returned by `QueryInterface()`. Once started, `D2Server.dll` sets up network processing and performs calls to DLLs such as `Fog.dll` and `D2Game.dll` to create and run game instances.

## History
Blizzard accidentally included `D2Server.dll` in distributions of Diablo II 1.00, but have removed the file in subsequent installers and patches. Using `D2Server.dll`, Onlyer developed a working game server in late 2000 and eventually released D2GS in 2001. D2GS was actively developed between 2001 and 2002, adding support for patches 1.09c and 1.09d. Several months after Diablo II patch 1.10 was released, Onlyer released the final D2GS version, D2GS 1.10 - Build 6 on March 4, 2004.

Because Onlyer didn't release the source code for D2GS, D2GS servers were stuck with supporting patch 1.10 as patches 1.11 and 1.11b became released in 2005. In 2007, Marsgod began distributing D2GS with support for patch 1.11b and eventually supported patches 1.13a and 1.13c.

Marsgod technique was to compile hand written assembly and copy the code section of the compiled program into `D2Server.dll`.

At some point, the source code for D2GS 1.09d was released at [d2dev.dlg.cn](http://d2dev.dlg.cn). Mirrors have been uploaded at https://github.com/pvpgn/d2gs109 and http://www.pudn.com/Download/item/id/884918.html. Despite the release of the source code, most D2GS servers still rely on Marsgod's distributions because of the lack of development using the source code. Only one person, [tesseract2048](https://github.com/tesseract2048/), has been known to [update the source code](https://github.com/tesseract2048/d2gs) and use it in production, though its known to be buggy and it requires a customized version of `d2cs` and `d2dbs`.

## Protocol Documentation
There isn't a single source that documents all known packets.

- https://github.com/MephisTools/diablo2-protocol/wiki/packets
- https://bnetdocs.org/packet/index?order=packet-id-asc&pktapplayer%5B%5D=4
- https://d2mods.info/forum/viewtopic.php?t=62821

## A Message From Onlyer
> About the Diablo2 Close Battle.net Server
>
> As you can see, I and my partners made a Battle.net server with Diablo2 close game support last year. I will try to explain how it works and what is the problem with it. 
>
> First, I will show why and how I made that server. 
>
> Last year, after Diablo2 comes out, I know that game from friends and was soon interested in it. Soon, I am tired with single player game, and so changes to play multiplayer > game on our local lan. in these days, I heard of a software named FSGS can help to create a battle.net server for Diablo2, that makes multiplayer game more easy and interesting. So I setup a server with FSGS on lan, and from FSGS's web page, I know that they are developing with the Diablo2 close server. it will be exciting if there are close mode support for this game, for our net limit, we can not go abord directly. And it will be very lag to play it on official battle.net through proxy. So I waited and hope FSGS can make it out soon. 
>
> After a long time wait, no good news from FSGS, and it keeps saying -- it will be out, wait and see... In these days, I found that FSGS is spawned from BNETD, which also can make a battle.net server. And the most important, BNETD is open source. So I decided try to make a own server with Diablo2 close support by modifying current BNETD code. 
>
> I downloaded the source and compiled it, start the server. all works fine. so I changed all current FSGS server user account to BNETD format. change server to BNETD to test. in the test, I found BNETD is stable and begin to write own code. 
>
> I finished the battle.net part support for Diablo2 in short time, for BNETD source code is easy to understand and add new future. I should thanks all BNETD developer here, their hard work saved me lots of time. Then I began with the game server part. 
>
> As we know, the most important thing in Diablo2 close support is game server, unlike previous games from Blizzard, in close mode, the game server is in server instead of client side. The client just send player action to server, and server should reply the result in correct format. Blizzard do not make their game server to public, so it will be hard to program a game server in your own code. In this case, you should guess out all client/server communication protocol and then make program a Diablo2 game without client GUI interface. I decided to use another way. 
>
> You can find out easily that in tcp/ip mode games, the host just act as a game server. So the way i choose is using the tcp/ip game host as game server. The battle.net server listen at game server port, receive client request, do some necessary parse, get the imformation, do some change when needed, pass the request to a tcp/ip game host. The game host will respones to the request, the battle.net server will receive the respones, do some parse again here. Then pass it to the client, just works like a proxy or tunnel. There is a tool called bnproxy in BNETD utils, so I merged bnproxy with BNETD, bnproxy act as tunnel to game server. BNETD for battle.net server as before, and after lots of failure and try, I find that works as I image at first. The close game server use a nearly same protocol with open game host. This is the initial model of the server. 
>
> At that time, the game server only supports one game as tcp/ip host, that sounds very bad, isn't it? But soon, I found out some hidden game protocol that can create more than one game in one host, and with modifying some paramters in the request, the game server can act much like official game server.
>
> At the end of last year, after some weeks debug and test, the server based on this model becomes much stable than begining, so i put it out. In these days, some friends joined the development, and also lots of friends help to test and maintain the server. I should say great thanks to them. 
>
> But still, there are lots of problems and bugs in the server based on this model. and lots of code are from scratch. so I and my partners planed to change current server architecture. but with time limit and some other reason, it goes on slowly and seems stopped. 
>
> And currently, I plans to combine my old project into BNETD project, that will save time and avoid repeat work, hope we can make it better together. 
>
> Comments and suggestions are welcomed to onlyer@263.net BTW: the old 1.03 server code is a tempory solution, and nearly useless now, no need to waste time to read it.
>
> ***onlyer***
>
> 2001-08-13

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 2
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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
```

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