端口映射源代码，对于公网访问内网服务有一定好处

 

int nTimes = 0;

int DataSend(SOCKET s, char *DataBuf, int DataLen)//将DataBuf中的DataLen个字节发到s去
{
 int nBytesLeft = DataLen;
 int nBytesSent = 0;
 int ret;
 //set socket to blocking mode
 int iMode = 0;
 ioctlsocket(s, FIONBIO, (u_long FAR*) &iMode);
 while(nBytesLeft > 0)
 {
 ret = send(s, DataBuf + nBytesSent, nBytesLeft, 0);
 if(ret <= 0)
 break;
 nBytesSent += ret;
 nBytesLeft -= ret;
 }
 return nBytesSent;
}

DWORD WINAPI TransmitData(LPVOID lParam)//在两个SOCKET中进行数据转发
{
 SOCKINFO socks = *((SOCKINFO*)lParam);
 SOCKET ClientSock = socks.ClientSock;
 SOCKET ServerSock = socks.ServerSock;
 char RecvBuf[MAXBUFSIZE] = {0};
 fd_set Fd_Read;
 int ret, nRecv;

 while(1)
 {
 FD_ZERO(&Fd_Read);
 FD_SET(ClientSock, &Fd_Read);
 FD_SET(ServerSock, &Fd_Read);
 ret = select(0, &Fd_Read, NULL, NULL, NULL);
 if(ret <= 0)
 goto error;
 if(FD_ISSET(ClientSock, &Fd_Read))
 {
 nRecv = recv(ClientSock, RecvBuf, sizeof(RecvBuf), 0);
 if(nRecv <= 0)
 goto error;
 ret = DataSend(ServerSock, RecvBuf, nRecv);
 if(ret == 0 || ret != nRecv)
 goto error;
 }
 if(FD_ISSET(ServerSock, &Fd_Read))
 {
 nRecv = recv(ServerSock, RecvBuf, sizeof(RecvBuf), 0);
 if(nRecv <= 0)
 goto error;
 ret = DataSend(ClientSock, RecvBuf, nRecv);
 if(ret == 0 || ret != nRecv)
 goto error;
 }
 }

error:
 closesocket(ClientSock);
 closesocket(ServerSock);
 return 0;
}

SOCKET ConnectHost(DWORD dwIP, WORD wPort)//连接指定IP和端口
{
 SOCKET sockid;

 if ((sockid = socket(AF_INET,SOCK_STREAM,0)) == INVALID_SOCKET)
 return 0;
 struct sockaddr_in srv_addr;
 srv_addr.sin_family = AF_INET;
 srv_addr.sin_addr.S_un.S_addr = dwIP;
 srv_addr.sin_port = htons(wPort);
 if (connect(sockid,(struct sockaddr*)&srv_addr,sizeof(struct sockaddr_in)) == SOCKET_ERROR)
 goto error;
 return sockid;
error:
 closesocket(sockid);
 return 0;
}

SOCKET ConnectHost(char *szIP, WORD wPort)
{
 return ConnectHost(inet_addr(szIP), wPort);
}

SOCKET CreateSocket(DWORD dwIP, WORD wPort)//在dwIP上绑定wPort端口
{
 SOCKET sockid;

 if ((sockid = socket(AF_INET,SOCK_STREAM,0)) == INVALID_SOCKET)
 return 0;
 struct sockaddr_in srv_addr = {0};
 srv_addr.sin_family = AF_INET;
 srv_addr.sin_addr.S_un.S_addr = dwIP;
 srv_addr.sin_port = htons(wPort);
 if (bind(sockid,(struct sockaddr*)&srv_addr,sizeof(struct sockaddr_in)) == SOCKET_ERROR)
 goto error;
 listen(sockid,3);
 return sockid;
error:
 closesocket(sockid);
 return 0;
}

SOCKET CreateTmpSocket(WORD *wPort)//创建一个临时的套接字,指针wPort获得创建的临时端口
{
 struct sockaddr_in srv_addr = {0};
 int addrlen = sizeof(struct sockaddr_in);

 SOCKET s = CreateSocket(INADDR_ANY, 0);
 if(s <= 0)
 goto error;

 if(getsockname(s, (struct sockaddr*)&srv_addr, &addrlen) == SOCKET_ERROR)
 goto error;
 *wPort = ntohs(srv_addr.sin_port);
 return s;
error:
 closesocket(s);
 return 0;
}

BOOL InitSocket()
{
 WSADATA wsadata;
 return WSAStartup(MAKEWORD(2,2),&wsadata) == 0;
}

DWORD WINAPI PortTransfer_1(LPVOID lParam)
{
 TransferParam<ADDRESS, SOCKET> *ConfigInfo = (TransferParam<ADDRESS, SOCKET>*)lParam;
 SOCKET ClientSock, ServerSock;

 //出栈，获得客户的套接字
 ClientSock = ConfigInfo->LocalData.Pop();
 printf("ThreadID: %d ==> Now Connecting To Server...", nTimes);
 //先连接到目标计算机的服务
 ServerSock = ConnectHost(ConfigInfo->GlobalData.szIP, ConfigInfo->GlobalData.wPort);
 if(ServerSock <= 0)
 {
 printf("Error.\r\n");
 closesocket(ClientSock);
 return 0;
 }
 printf("OK.\r\nStarting TransmitData\r\n");
 SOCKINFO socks;
 socks.ClientSock = ClientSock;//客户的套接字
 socks.ServerSock = ServerSock;//目标计算机服务的套接字
 //进入纯数据转发状态
 return TransmitData((LPVOID)&socks);
}

BOOL PortTransfer_1(WORD ListenPort, char *szIP, WORD wPort)
{
 HANDLE hThread;
 DWORD dwThreadId;
 SOCKET AcceptSocket;

 TransferParam<ADDRESS, SOCKET> ConfigInfo;

 _snprintf(ConfigInfo.GlobalData.szIP, ADDRSIZE, "%s", szIP);
 ConfigInfo.GlobalData.wPort = wPort;

 //监听个服务端口，即映射端口
 SOCKET localsockid = CreateSocket(INADDR_ANY, ListenPort);
 if(localsockid <= 0)
 goto error;
 while(1)
 {
 printf("Accepting new Client...");
 AcceptSocket = accept(localsockid, NULL, NULL);
 if(AcceptSocket == INVALID_SOCKET)
 goto error;
 nTimes++;
 printf("OK.\r\n");
 //将接受到的客户请求套接字转到新的线程里处理
 //然后继续等待新的请求
 ConfigInfo.LocalData.Push(AcceptSocket);
 hThread = CreateThread(NULL, 0, PortTransfer_1, (LPVOID)&ConfigInfo, NULL, &dwThreadId);
 if(hThread)
 CloseHandle(hThread);
 else
 Sleep(1000);
 
 }
error:
 printf("Error.\r\n");
 closesocket(localsockid);
 return false;
}

DWORD WINAPI PortTransfer_2(LPVOID lParam)
{
 TransferParam<ADDRESS, WORD> *ConfigInfo = (TransferParam<ADDRESS, WORD> *)lParam;
 SOCKET CtrlSocket = ConfigInfo->GlobalData.s;
 DWORD dwCtrlIP;
 //WORD wPort;
 SOCKADDR_IN clientaddr;
 int addrlen = sizeof(clientaddr);
 //之前用错了个API(getsockname),这里应该用getpeername
 if(getpeername(CtrlSocket, (SOCKADDR *)&clientaddr, &addrlen) == SOCKET_ERROR)
 return 0;
 //获得运行PortTransfer_3模式的计算机的IP
 dwCtrlIP = clientaddr.sin_addr.S_un.S_addr;
 //wPort = ntohs(clientaddr.sin_port);

 SOCKET ClientSocket, ServerSocket;
 SOCKINFO socks;
 printf("ThreadID: %d ==> Connecting to Client...", nTimes);
 //向公网建立新的连接
 ClientSocket = ConnectHost(dwCtrlIP, ConfigInfo->LocalData.Pop());
 if(ClientSocket <= 0)
 return 0;
 printf("OK.\r\n");
 printf("ThreadID: %d ==> Connect to Server...", nTimes);
 //连接到目标计算机的服务
 ServerSocket = ConnectHost(ConfigInfo->GlobalData.szIP, ConfigInfo->GlobalData.wPort);
 if(ServerSocket <= 0)
 {
 printf("Error.\r\n");
 closesocket(ClientSocket);
 return 0;
 }
 printf("OK.\r\nStarting TransmitData\r\n", nTimes);
 socks.ClientSock = ClientSocket;//公网计算机的套接字
 socks.ServerSock = ServerSocket;//目标计算机服务的套接字
 //进入纯数据转发状态
 return TransmitData((LPVOID)&socks);
}

BOOL PortTransfer_2(char *szCtrlIP, WORD wCtrlPort, char *szIP, WORD wPort)
{
 int nRecv;
 WORD ReqPort;
 HANDLE hThread;
 DWORD dwThreadId;
 TransferParam<ADDRESS, WORD> ConfigInfo;
 _snprintf(ConfigInfo.GlobalData.szIP, ADDRSIZE, "%s", szIP);
 ConfigInfo.GlobalData.wPort = wPort;

 printf("Creating a ctrlconnection...");
 //与PortTransfer_3模式（工作在共网）的计算机建立控制管道连接
 SOCKET CtrlSocket = ConnectHost(szCtrlIP, wCtrlPort);
 if(CtrlSocket <= 0)
 goto error;
 ConfigInfo.GlobalData.s = CtrlSocket;
 printf("OK.\r\n");
 while(1)
 {
 //接收来自（工作在公网）计算机的命令，数据为一个WORD，

 

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