Mir2源码详解之服务端-登录网关(LoginGate）
传奇这款游戏，一直对我的影响很大。当年为了玩传奇，逃课，被老师叫过N次家长。言归正传，网上有很多源码，当然了，都是delphi的。并且很多源码还不全，
由于一直学习的c、c++。delphi还真不懂。无奈硬着头皮上。好了。废话不多说。开始。
登录网关，负责游戏最开始的登录处理（与账户服务器LoginSvr通讯）。验证登录器输入的账户密码是否正确。
界面上的控件很多。其实干活的就 就 三个：“TServerSocket”、“TClientSocket”、“DecodeTimer”这三个控件。
ServerSocket：负责与登录器进行通讯，它做的操作：
1、接收连接，代码如下：
{
函数功能：接受客户端连接，发送消息到 登录服务器
}
procedure TFrmMain.ServerSocketClientConnect(Sender: TObject;
Socket: TCustomWinSocket);
var
UserSession:pTUserSession;
sRemoteIPaddr,sLocalIPaddr:String;
nSockIndex:Integer;
IPaddr :pTSockaddr;
begin
Socket.nIndex:=-1;
// 客户端IP地址
sRemoteIPaddr:=Socket.RemoteAddress;
if g_boDynamicIPDisMode then begin
sLocalIPaddr:=ClientSocket.Socket.RemoteAddress;
end else begin
sLocalIPaddr:=Socket.LocalAddress;
end;
// 过滤ip
if IsBlockIP(sRemoteIPaddr) then begin
MainOutMessage('过滤连接: ' + sRemoteIPaddr,1);
Socket.Close;
exit;
end;
// 当前IP是否可以连接
if IsConnLimited(sRemoteIPaddr) then begin
case BlockMethod of
// 断开
mDisconnect: begin
Socket.Close;
end;
// 动态过滤
mBlock: begin
New(IPaddr);
IPaddr.nIPaddr:=inet_addr(PChar(sRemoteIPaddr));
TempBlockIPList.Add(IPaddr);
CloseConnect(sRemoteIPaddr);
end;
// 永久过滤
mBlockList: begin
New(IPaddr);
IPaddr.nIPaddr:=inet_addr(PChar(sRemoteIPaddr));
BlockIPList.Add(IPaddr);
CloseConnect(sRemoteIPaddr);
end;
end;
MainOutMessage('端口攻击: ' + sRemoteIPaddr,1);
exit;
end;
// 如果网关准备好了
if boGateReady then begin
for nSockIndex:= 0 to GATEMAXSESSION - 1 do begin
UserSession:=@g_SessionArray[nSockIndex];
if UserSession.Socket = nil then begin
UserSession.Socket:=Socket;
UserSession.sRemoteIPaddr:=sRemoteIPaddr;
UserSession.nSendMsgLen:=0;
UserSession.bo0C:=False;
UserSession.dw10Tick:=GetTickCount();
UserSession.dwConnctCheckTick:=GetTickCount();
UserSession.boSendAvailable:=True;
UserSession.boSendCheck:=False;
UserSession.nCheckSendLength:=0;
UserSession.n20:=0;
UserSession.dwUserTimeOutTick:=GetTickCount();
UserSession.SocketHandle:=Socket.SocketHandle;
UserSession.sIP:=sRemoteIPaddr;
UserSession.MsgList.Clear;
Socket.nIndex:=nSockIndex;
Inc(nSessionCount);
break;
end;
end;
// 和本地登录服务器进行通讯
if Socket.nIndex >= 0 then begin
ClientSocket.Socket.SendText('%O' +
IntToStr(Socket.SocketHandle) +
'/' +
sRemoteIPaddr +
'/' +
sLocalIPaddr +
'$');
MainOutMessage('Connect: ' + sRemoteIPaddr,5);
end else begin
Socket.Close;
MainOutMessage('Kick Off: ' + sRemoteIPaddr,1);
end;
end else begin //0x004529EF
Socket.Close;
MainOutMessage('Kick Off: ' + sRemoteIPaddr,1);
end;
end;
说白了，别看 那些IP过滤规则和连接限制什么的。就是 来了一用户，直接保存到一个 UserSession中。然后通知LoginSvr，有人连接了。。现在市面上的什么：GOM引擎、Hero、HGE（原3K、IGE）、Legend、GEEM2、77M2都是换汤不换药。变的就是 加密方式。这里不得不说，JsocketJ就是TServerSocket、TClientSocket的控件，懒得看源码，看了下其属性，大致就可以了解到。
是采用的线程池的select模型。早期的游戏，都采用这种方式，不过，对于私*服，连接量不大，完全足够应付。其实有更好的解决办法，那就是IOCP来管理。效率更高。windows下最适合的模型了。
2、断开连接，代码如下：
procedure TFrmMain.ServerSocketClientDisconnect(Sender: TObject;
Socket: TCustomWinSocket);
var
I:Integer;
UserSession:pTUserSession;
nSockIndex:Integer;
sRemoteIPaddr:String;
IPaddr :pTSockaddr;
nIPaddr :Integer;
begin
sRemoteIPaddr:=Socket.RemoteAddress;
nIPaddr:=inet_addr(PChar(sRemoteIPaddr));
nSockIndex:=Socket.nIndex;
for I := 0 to CurrIPaddrList.Count - 1 do begin
IPaddr:=CurrIPaddrList.Items[I];
if IPaddr.nIPaddr = nIPaddr then begin
Dec(IPaddr.nCount);
if IPaddr.nCount <= 0 then begin
Dispose(IPaddr);
CurrIPaddrList.Delete(I);
end;
Break;
end;
end;
if (nSockIndex >= 0) and (nSockIndex < GATEMAXSESSION) then begin
UserSession:=@g_SessionArray[nSockIndex];
UserSession.Socket:=nil;
UserSession.sRemoteIPaddr:='';
UserSession.SocketHandle:=-1;
UserSession.MsgList.Clear;
Dec(nSessionCount);
if boGateReady then begin
ClientSocket.Socket.SendText('%X' +
IntToStr(Socket.SocketHandle) +
'$');
MainOutMessage('DisConnect: ' + sRemoteIPaddr,5);
end;
end;
end;
删除，释放，并通知 LoginSvr，有人断开连接了。。。
3、接收数据，代码如下：
procedure TFrmMain.ServerSocketClientRead(Sender: TObject;
Socket: TCustomWinSocket);
var
UserSession:pTUserSession;
nSockIndex:Integer;
sReviceMsg,s10,s1C:String;
nPos:Integer;
nMsgLen:Integer;
begin
nSockIndex:=Socket.nIndex;
if (nSockIndex >= 0) and (nSockIndex < GATEMAXSESSION) then begin
UserSession:=@g_SessionArray[nSockIndex];
sReviceMsg:=Socket.ReceiveText;
if (sReviceMsg <> '') and (boServerReady) then begin
nPos:=Pos('*',sReviceMsg);
if nPos > 0 then begin
UserSession.boSendAvailable:=True;
UserSession.boSendCheck:=False;
UserSession.nCheckSendLength:=0;
s10:=Copy(sReviceMsg,1,nPos -1);
s1C:=Copy(sReviceMsg,nPos + 1,Length(sReviceMsg) - nPos);
sReviceMsg:=s10 + s1C;
end;
nMsgLen:=length(sReviceMsg);
if (sReviceMsg <> '') and (boGateReady) and (not boKeepAliveTimcOut)then begin
UserSession.dwConnctCheckTick:=GetTickCount();
if (GetTickCount - UserSession.dwUserTimeOutTick) < 1000 then begin
Inc(UserSession.n20,nMsgLen);
end else UserSession.n20:= nMsgLen;
ClientSocket.Socket.SendText('%A' +
IntToStr(Socket.SocketHandle) +
'/' +
sReviceMsg +
'$');
end;
end;
end;
end;
拿到数据，转发到 登录账户服务器。。。。。它主要干的事完了。。
ClientSocket：负责与LoginSvr进行通讯，它做的主要工作就是，
procedure TFrmMain.ClientSocketRead(Sender: TObject; Socket: TCustomWinSocket); var sRecvMsg:String; begin sRecvMsg:=Socket.ReceiveText; ClientSockeMsgList.Add(sRecvMsg); end;
你没有看错，就是接收到数据。然后保存到链表，然后等待定时器来解析操作。。
DecodeTimer 定时器的工作。源码中设置的 时间精度是 1毫秒：
procedure TFrmMain.DecodeTimerTimer(Sender : TObject);
var
sProcessMsg :String;
sSocketMsg :String;
sSocketHandle :String;
nSocketIndex :Integer;
nMsgCount :Integer;
nSendRetCode :Integer;
nSocketHandle :Integer;
dwDecodeTick :LongWord;
dwDecodeTime :LongWord;
sRemoteIPaddr :String;
UserSession :pTUserSession;
IPaddr :pTSockaddr;
begin
ShowMainLogMsg();
if boDecodeLock or (not boGateReady)then exit;
try
dwDecodeTick:=GetTickCount();
boDecodeLock:=True;
sProcessMsg:='';
while (True) do begin
if ClientSockeMsgList.Count <= 0 then break;
sProcessMsg:=sProcMsg + ClientSockeMsgList.Strings[0];
sProcMsg:='';
ClientSockeMsgList.Delete(0);
while (True) do begin
if TagCount(sProcessMsg,'$') < 1 then break;
sProcessMsg:=ArrestStringEx(sProcessMsg,'%','$',sSocketMsg);
if sSocketMsg = ''then break;
if sSocketMsg[1] = '+' then begin
if sSocketMsg[2] = '-' then begin
CloseSocket(Str_ToInt(Copy(sSocketMsg,3,Length(sSocketMsg) - 2),0));
Continue;
end else begin //0x004521B7
dwKeepAliveTick:=GetTickCount();
boKeepAliveTimcOut:=False;
Continue;
end;
end; //0x004521CD
sSocketMsg:=GetValidStr3(sSocketMsg,sSocketHandle,['/']);
nSocketHandle:=Str_ToInt(sSocketHandle,-1);
if nSocketHandle < 0 then
Continue;
for nSocketIndex:= 0 to GATEMAXSESSION - 1 do begin
if g_SessionArray[nSocketIndex].SocketHandle = nSocketHandle then begin
g_SessionArray[nSocketIndex].MsgList.Add(sSocketMsg);
break;
end;
end;
end; //0x00452246
end; //0x452252
//if sProcessMsg <> '' then ClientSockeMsgList.Add(sProcessMsg);
if sProcessMsg <> '' then sProcMsg:=sProcessMsg;
nSendMsgCount:=0;
n456A2C:=0;
StringList318.Clear;
for nSocketIndex:= 0 to GATEMAXSESSION - 1 do begin
if g_SessionArray[nSocketIndex].SocketHandle <= -1 then Continue;
//踢除超时无数据传输连接
if (GetTickCount - g_SessionArray[nSocketIndex].dwConnctCheckTick) > dwKeepConnectTimeOut then begin
sRemoteIPaddr:=g_SessionArray[nSocketIndex].sRemoteIPaddr;
case BlockMethod of //
mDisconnect: begin
g_SessionArray[nSocketIndex].Socket.Close;
end;
mBlock: begin
New(IPaddr);
IPaddr.nIPaddr:=inet_addr(PChar(sRemoteIPaddr));
TempBlockIPList.Add(IPaddr);
CloseConnect(sRemoteIPaddr);
end;
mBlockList: begin
New(IPaddr);
IPaddr.nIPaddr:=inet_addr(PChar(sRemoteIPaddr));
BlockIPList.Add(IPaddr);
CloseConnect(sRemoteIPaddr);
end;
end;
MainOutMessage('端口空连接攻击: ' + sRemoteIPaddr,1);
Continue;
end;
while (True) do begin;
if g_SessionArray[nSocketIndex].MsgList.Count <= 0 then break;
UserSession:=@g_SessionArray[nSocketIndex];
nSendRetCode:=SendUserMsg(UserSession,UserSession.MsgList.Strings[0]);
if (nSendRetCode >= 0) then
begin
if nSendRetCode = 1 then begin
UserSession.dwConnctCheckTick:=GetTickCount();
UserSession.MsgList.Delete(0);
Continue;
end;
if UserSession.MsgList.Count > 100 then begin
nMsgCount:=0;
while nMsgCount <> 51 do begin
UserSession.MsgList.Delete(0);
Inc(nMsgCount);
end;
end;
Inc(n456A2C,UserSession.MsgList.Count);
MainOutMessage(UserSession.sIP +
' : ' +
IntToStr(UserSession.MsgList.Count),5);
Inc(nSendMsgCount);
end else begin //0x004523A4
UserSession.SocketHandle:= -1;
UserSession.Socket:= nil;
UserSession.MsgList.Clear;
end;
end;
end;
if (GetTickCount - dwSendKeepAliveTick) > 2 * 1000 then begin
dwSendKeepAliveTick:=GetTickCount();
if boGateReady then
ClientSocket.Socket.SendText('%--$');
end;
if (GetTickCount - dwKeepAliveTick) > 10 * 1000 then begin
boKeepAliveTimcOut:=True;
ClientSocket.Close;
end;
finally
boDecodeLock:=False;
end;
dwDecodeTime:=GetTickCount - dwDecodeTick;
if dwDecodeMsgTime < dwDecodeTime then dwDecodeMsgTime:=dwDecodeTime;
if dwDecodeMsgTime > 50 then Dec(dwDecodeMsgTime,50);
end;
又是一坨代码，简而言之，就是把刚才保存接收到的数据。分发到 每个用户的自己的消息链表中，然后遍历，发送出去，
代码如下：
// 发送用户消息
function TFrmMain.SendUserMsg(UserSession:pTUserSession;sSendMsg:String):Integer;
begin
Result:= -1;
// 如果
if UserSession.Socket <> nil then begin
// 取反
if not UserSession.bo0C then begin
// 如果不能发送,则置可用
if not UserSession.boSendAvailable and (GetTickCount > UserSession.dwSendLockTimeOut) then begin
UserSession.boSendAvailable := True;
UserSession.nCheckSendLength := 0;
boSendHoldTimeOut := True;
dwSendHoldTick := GetTickCount();
end; //004525DD
if UserSession.boSendAvailable then begin
if UserSession.nCheckSendLength >= 250 then begin
if not UserSession.boSendCheck then begin
UserSession.boSendCheck:=True;
sSendMsg:='*' + sSendMsg;
end;
if UserSession.nCheckSendLength >= 512 then begin
UserSession.boSendAvailable:=False;
UserSession.dwSendLockTimeOut:=GetTickCount + 3 * 1000;
end;
end; //00452620
UserSession.Socket.SendText(sSendMsg);
Inc(UserSession.nSendMsgLen,length(sSendMsg));
Inc(UserSession.nCheckSendLength,length(sSendMsg));
Result:= 1;
end else begin //0x0045264A
Result:= 0;
end;
end else begin //0x00452651
Result:= 0;
end;
end;
end;
登录网关，是不是很简单，这不是 重点，重点是市面上的很多引擎的登录网关都基于这套机制，只需要逆向分析下其加密算法，一个自定义网关则出来了。至于过滤规则，什么IP通道，都是浮云。。。。