socket端口数据转发

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参考文章：http://blog.csdn.net/wangyi_lin/article/details/9277717?utm_source=tuicool

 灵感来源于lcx.exe

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先说下我的需求：

因工作的需要，别的电脑在访问我的电脑的80端口时，我希望其访问的其实是某台设备的80端口，

因为我的电脑根本没有web服务，提供web服务的其实是某台设备，公司有很多台设备哈。。。

而别的电脑只能访问我的电脑，不能直接访问设备。。。

为了别的电脑能通过我的电脑访问到设备，因此我写了这个程序。。。

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该demo程序我测试了百度、人人网、博客园，都可以通过我的程序进行转发访问，

说明我的想法真的可以实现了。。。

为了测试，需要修改以下文件：

C:\Windows\System32\drivers\etc\hosts

如我的为：

192.168.1.3 www.renren.com
192.168.1.3 www.baidu.com
192.168.1.3 www.cnblogs.com

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程序效果如下：

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关键代码如下：

// 80端口监听线程void CTranspondDlg::ThreadListenPort80( void ){    ShowMessage("进入ThreadListenPort80");    SOCKET skServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);    if (INVALID_SOCKET == skServer)    {        ShowMessage("创建socket失败");        m_bIsStop = true;    }    SOCKADDR_IN skSvrAddr;    skSvrAddr.sin_family = AF_INET;    skSvrAddr.sin_port = htons(80);    skSvrAddr.sin_addr.S_un.S_addr = ADDR_ANY;    if (bind(skServer, (struct sockaddr*)&skSvrAddr, sizeof(skSvrAddr)) == SOCKET_ERROR)    {        ShowMessage("80端口绑定socket失败");        m_bIsStop = true;    }    if (listen(skServer, SOMAXCONN) == SOCKET_ERROR)    {        ShowMessage("80端口监听socket失败");        m_bIsStop = true;    }    else    {        ShowMessage("socket监听80端口成功，等待客户连接...");    }    CString strLog;    while(!m_bIsStop)    {        if (SOCKET_Select(skServer, 500, TRUE))        {            SOCKET skClient;            int iAddrLen = sizeof(SOCKADDR_IN);            SOCKADDR_IN skAddrClient;            skClient = accept(skServer, (sockaddr*)&skAddrClient, &iAddrLen);            strLog.Format("有客户连接：%s:%d", inet_ntoa(skAddrClient.sin_addr), ntohs(skAddrClient.sin_port));            ShowMessage(strLog);            // 连接真正的web服务器            SOCKET skWeb = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);            if (skWeb == skServer)            {                ShowMessage("创建web socket失败");                m_bIsStop = true;                break;            }            SOCKADDR_IN skAddrWeb;            skAddrWeb.sin_family = AF_INET;            skAddrWeb.sin_port = htons(80);            skAddrWeb.sin_addr.S_un.S_addr = inet_addr("180.97.33.108"); // 百度            //skAddrWeb.sin_addr.S_un.S_addr = inet_addr("220.181.181.224"); // 人人            //skAddrWeb.sin_addr.S_un.S_addr = inet_addr("42.121.252.58"); // cnblogs            if (connect(skWeb, (sockaddr*)&skAddrWeb, sizeof(sockaddr)) == SOCKET_ERROR)            {                ShowMessage("连接web服务器失败");                m_bIsStop = true;                break;            }            // 开启数据转发线程            TranspondSocket transpondSocket;            transpondSocket.pThis = this;            transpondSocket.skClient = skClient;            transpondSocket.skServer = skWeb;            HANDLE hTmp = (HANDLE)_beginthreadex(NULL, 0, ThreadTranspondDataProxy, &transpondSocket, 0, NULL);            CloseHandle(hTmp);            hTmp = NULL;        }    }    closesocket(skServer);    ShowMessage("退出ThreadListenPort80");}

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// 数据转发线程void CTranspondDlg::ThreadTranspondData( LPVOID pvParam ){    ShowMessage("进入ThreadTranspondData");    CString strLog;    TranspondSocket *pTS = (TranspondSocket*)pvParam;    if (pTS == NULL)    {        ShowMessage("ThreadTranspondData 参数错误");        ShowMessage("退出ThreadTranspondData");        return;    }    // SIO_KEEPALIVE_VALS 机制    //structtcp_keepalive {    //    ULONGonoff ;          // 是否开启keepalive    //    ULONGkeepalivetime ;  // 多长时间（ms）没有数据就开始send心跳包    //    ULONGkeepaliveinterval ; // 每隔多长时间（ms）send一个心跳包，    //                             // 发5次(2000 XP 2003默认), 10次(Vista后系统默认)    //};        //tcp_keepalive inKeepAlive = {0};    //tcp_keepalive outKeepAlive = {0};    //unsigned long ulInLen = sizeof(tcp_keepalive);    //unsigned long ulOutLen = sizeof(tcp_keepalive);    //unsigned long ulBytesReturn = 0;    //inKeepAlive.onoff = 1;    //inKeepAlive.keepaliveinterval = 1000; //单位为毫秒    //inKeepAlive.keepalivetime = 1000;     //单位为毫秒    //int iRet = WSAIoctl(pTS->skClient, SIO_KEEPALIVE_VALS, (LPVOID)&inKeepAlive, ulInLen,  (LPVOID)&outKeepAlive, ulOutLen, &ulBytesReturn, NULL, NULL);    //if (iRet != 0)    //{    //    strLog.Format("WSAIoctl错误, ErrCode=%d", WSAGetLastError());    //    ShowMessage(strLog);    //    ShowMessage("退出ThreadTranspondData");    //    return;    //}    //iRet = WSAIoctl(pTS->skClient, SIO_KEEPALIVE_VALS, (LPVOID)&inKeepAlive, ulInLen,  (LPVOID)&outKeepAlive, ulOutLen, &ulBytesReturn, NULL, NULL);    //if (iRet != 0)    //{    //    strLog.Format("WSAIoctl错误, ErrCode=%d", WSAGetLastError());    //    ShowMessage(strLog);    //    ShowMessage("退出ThreadTranspondData");    //    return;    //}    bool bIsExit = false;    int iRecvSum = 0;    int iSendSum = 0;    char szBuf[4096] = {0};    DWORD dwErroCode = 0;    while(!m_bIsStop)    {        if (bIsExit)        {            break;        }        memset(szBuf, 0, sizeof(szBuf));        iRecvSum = 0;        iSendSum = 0;        // 接收客户端数据        while(SOCKET_Select(pTS->skClient, 100, TRUE))        {            iRecvSum = recv(pTS->skClient, szBuf, sizeof(szBuf), 0);            dwErroCode = WSAGetLastError();            // 判断客户端是否断开            if (WSAGetLastError() == WSAECONNRESET)            {                ShowMessage("客户端断开");                bIsExit = true;                break;            }            if (iRecvSum <= 0)            {                strLog.Format("没有收到服客户端数据:dwErroCode=%d", dwErroCode);                ShowMessage(strLog);                bIsExit = true;                break;            }            strLog.Format("收到客户端数据:iReadSum=%d", iRecvSum);            ShowMessage(strLog);            strLog.Format("%s", szBuf);            ShowMessage(strLog);            // 将客户请求的数据发给真正的服务器            iSendSum = send(pTS->skServer, szBuf, iRecvSum, 0);            strLog.Format("给服务器发送数据:iSendSum=%d, ErrCode=%d", iSendSum, WSAGetLastError());            ShowMessage(strLog);        }        // 接收真正的服务器返回来的数据        while(SOCKET_Select(pTS->skServer, 100, TRUE))        {            iRecvSum = recv(pTS->skServer, szBuf, sizeof(szBuf), 0);            dwErroCode = WSAGetLastError();            // 判断服务器是否断开            if (WSAGetLastError() == WSAECONNRESET)            {                ShowMessage("服务器断开");                bIsExit = true;                break;            }            if (iRecvSum <= 0)            {                strLog.Format("没有收到服务器数据:dwErroCode=%d", dwErroCode);                ShowMessage(strLog);                bIsExit = true;                break;            }            strLog.Format("收到服务器数据:iRecvSum=%d", iRecvSum);            ShowMessage(strLog);            strLog.Format("%s", szBuf);            ShowMessage(strLog);            // 将服务器数据发给客户端            iSendSum = send(pTS->skClient, szBuf, iRecvSum, 0);            strLog.Format("发送给客户端数据:iSendSum=%d, ErrCode=%d", iSendSum, WSAGetLastError());            ShowMessage(strLog);        }    }    closesocket(pTS->skClient);    closesocket(pTS->skServer);    ShowMessage("退出ThreadTranspondData");}

 

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唯一的缺点就是，客户端掉线的检测机制不是很好，留给需要的人去完善吧。。。

程序VS2010源码工程下载：

 http://download.csdn.net/detail/friendan/8684207

           

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