东北大学计算机网络实验报告.doc

计算机网络实验报告 实验名称Tcp与Udp的通信实现班 级 软信1101 学 号20112329姓 名杜海涛日 期 2013-7-13成 绩评 阅 人软件学院一、 实验目的与意义1、编写Tcp服务器与客户端程序，服务器程序在客户端连接后输出客户端信息（IP，端口号）2、编写Tcp服务器与客户端程序，客户端在连接后可从键盘输入字符，在服务器端实时显3、在2的基础上，服务器判断接收到的字符，如是某指定字符，则服务器退出监听4、编写基于Udp的控制台聊天程序通过tcp和udp的编程实现windows环境下的进程间的通信。二、 实验环境操作系统：Windows 7实验环境：Microsoft Visual C+6.0三、 实验的预习内容传输控制协议TCP(Transport Control Protocol)是一种面向连接的，可靠的传输层协议。面向连接是指一次正常的TCP传输需要通过在TCP客户端和TCP服务端建立特定的虚电路连接来完成，该过程通常被称为“三次握手”。举例说明，TCP客户端需要和TCP服务端建立连接，过程如图所示 第一步中，客户端向服务端提出连接请求。这时TCP SYN标志置位。客户端告诉服务端序列号区域合法，需要检查。客户端在TCP报头的序列号区中插入自己的ISN。服务端收到该TCP分段后，在第二步以自己的ISN回应(SYN标志置位)，同时确认收到客户端的第一个TCP分段(ACK标志置位)。在第三步中，客户端确认收到服务端的ISN(ACK标志置位)。到此为止建立完整的TCP连接，开始全双工模式的数据传输过程。 UDP（User Datagram Protocol），即用户数据报协议。它属于“面向无连接的不可靠的传输”的类型。UDP中，每个数据包称为“数据报”，它的包头只包含4个域，主要是地址信息与包的长度和校验信息。与此对应，TCP包的头信息有10多个域。因此UDP的网络开销一般要小于TCP。由于UDP在传送数据过程中没有建立连接，也不进行检查，因此UDP是不可靠的，它不能保证数据报能安全无误地到达目的主机。四、 实验的步骤与调试方法程序的流程图UDP协议下实验：程序流程图：五、 实验数据与实验结果TcpclientTcperverUdp clientUdp server六、 实验用程序清单（要有注释）TCPSERVER:/ Module Name: tcpserver.cpp#include #include #pragma comment(lib, ws2_32.lib)void main(void) WSADATA wsaData; SOCKET ListeningSocket; SOCKET NewConnection; SOCKADDR_IN ServerAddr; SOCKADDR_IN ClientAddr; int ClientAddrLen; int Port = 5150; int Ret; char DataBuffer1024; / Initialize Winsock version 2.2 if (Ret = WSAStartup(MAKEWORD(2,2), &wsaData) != 0) printf(WSAStartup failed with error %dn, Ret); return; / Create a new socket to listening for client connections. if (ListeningSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) = INVALID_SOCKET) printf(socket failed with error %dn, WSAGetLastError(); WSACleanup(); return; ServerAddr.sin_family = AF_INET; ServerAddr.sin_port = htons(Port); ServerAddr.sin_addr.s_addr = htonl(INADDR_ANY); / Associate the address information with the socket using bind. if (bind(ListeningSocket, (SOCKADDR *)&ServerAddr, sizeof(ServerAddr) = SOCKET_ERROR) printf(bind failed with error %dn, WSAGetLastError(); closesocket(ListeningSocket); WSACleanup(); return; / Listen for client connections. We used a backlog of 5 which is / normal for many applications. if (listen(ListeningSocket, 5) = SOCKET_ERROR) printf(listen failed with error %dn, WSAGetLastError(); closesocket(ListeningSocket); WSACleanup(); return; printf(等待客户端连接端口 %d.n, Port); / Accept a new connection when one arrives. ClientAddrLen = sizeof(ClientAddr); if (NewConnection = accept(ListeningSocket, (SOCKADDR *) &ClientAddr, &ClientAddrLen) = INVALID_SOCKET) printf(accept failed with error %dn, WSAGetLastError(); closesocket(ListeningSocket); WSACleanup(); return; printf(成功建立连接 %sn, inet_ntoa(ClientAddr.sin_addr); closesocket(ListeningSocket); / Start sending and receiving data on NewConnection. For simplicity, / we will just receive some data and report how many bytes were / received. printf(等待接收数据.n);printf(IP is %sn,inet_ntoa(ClientAddr.sin_addr); /打印ip地址printf(port is %dn,htons(ClientAddr.sin_port); /打印端口号While(flag) if (Ret = recv(NewConnection, DataBuffer, sizeof(DataBuffer), 0) /接收数据 = SOCKET_ERROR) printf(recv failed with error %dn, WSAGetLastError(); closesocket(NewConnection); WSACleanup(); return; if(i=strcmp(buffer,back)=0) /如果是指定字符断开连接flag=0;if(flag)*(DataBuffer+Ret)=0; printf(成功接收数据 %s,共 %d byte(s).n, DataBuffer,Ret); printf(准备关闭客户端连接.n);closesocket(NewConnection); / When your application is finished handling the connections / call WSACleanup. WSACleanup();/ tcpclient.exe /TCPCLIENT:#include #include void main(void) WSADATA wsaData; SOCKET s; SOCKADDR_IN ServerAddr; int Port = 5150; int Ret; Char sendbuf100; / Initialize Winsock version 2.2 if (Ret = WSAStartup(MAKEWORD(2,2), &wsaData) != 0) printf(WSAStartup failed with error %dn, Ret); return; / Create a new socket to make a client connection. if (s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) = INVALID_SOCKET) printf(socket failed with error %dn, WSAGetLastError(); WSACleanup(); return; ServerAddr.sin_family = AF_INET; ServerAddr.sin_port = htons(Port); ServerAddr.sin_addr.s_addr = inet_addr(127.0.0.1);/本机ip / Make a connection to the server with socket s. printf(ready to connect %s:%d.n,inet_ntoa(ServerAddr.sin_addr), htons(ServerAddr.sin_port); if (connect(s, (SOCKADDR *) &ServerAddr, sizeof(ServerAddr) = SOCKET_ERROR) printf(connect failed with error %dn, WSAGetLastError(); closesocket(s); WSACleanup(); return; printf(客户端连接成功.n); / At this point you can start sending or receiving data on / the socket s. We will just send a hello message to the server. printf(准备传送数据n);while(1)printf(input your word:);fflush(stdin);scanf(%s,sendbuf);printf(n);if(strcmp(sendbuf,back)=0) /如果是指定字符退出连接break;send(s, sendbuf, sizeof(sendbuf), 0)if (Ret = send(s, sendbuf, sizeof(sendbuf), 0) = SOCKET_ERROR) printf(send failed with error %dn, WSAGetLastError(); closesocket(s); WSACleanup(); return; printf(成功发送数据 %d byte(s).n, Ret); / When you are finished sending and receiving data on socket s, / you should close the socket. printf(关闭连接.n); closesocket(s); / When your application is finished handling the connection, call / WSACleanup. WSACleanup();UDPSERVER:#include#includevoid main()WORD wVersionRequested;WSADATA wsaData;int err;wVersionRequested = MAKEWORD( 1, 1 );err = WSAStartup( wVersionRequested, &wsaData );if ( err != 0 )return;if ( LOBYTE( wsaData.wVersion ) != 1 | HIBYTE( wsaData.wVersion ) != 1 ) WSACleanup( );return; SOCKET sockSrv=socket(AF_INET,SOCK_DGRAM,0);SOCKADDR_IN addrSrv;addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);addrSrv.sin_family=AF_INET;addrSrv.sin_port=htons(6000);bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR);char recvBuf100;char sendBuf100;char tempBuf200;SOCKADDR_IN addrClient;int len=sizeof(SOCKADDR);while(1)recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len);if(q=recvBuf0)sendto(sockSrv,q,strlen(q)+1,0,(SOCKADDR*)&addrClient,len);printf(chat end!n);break;sprintf(tempBuf,%s say: %s,inet_ntoa(addrClient.sin_addr),recvBuf);printf(%sn,tempBuf);printf(Please input data:n);gets(sendBuf);sendto(sockSrv,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR*)&addrClient,len);closesocket(sockSrv);WSACleanup();UDPCLIENT:#include#includevoid main()WORD wVersionRequested;WSADATA wsaData;int err;wVersionRequested = MAKEWORD( 1, 1 );err = WSAStartup( wVersionRequested, &wsaData );if ( err != 0 )return;if ( LOBYTE( wsaData.wVersion ) != 1 | HIBYTE( wsaData.wVersion ) != 1 ) WSACleanup( );return; SOCKET sockClient=socket(AF_INET,SOCK_DGRAM,0);SOCKADDR_IN addrSrv;addrSrv.sin_addr.S_un.S_addr=inet_addr(127.0.0.1);addrSrv.sin_family=AF_INET;addrSrv.sin_port=htons(6000);char recvBuf100;char sendBuf100;char tempBuf200