东北大学计算机网络试验报告

1、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实验目的与意义IP，端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（ 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：Win dows 7实验环境：Microsoft Visual C+6.0三、实

2、验的预习内容传输控制协议 TCP（Tra nsport Con trol 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LSTENTC3 StiteTCP PacketTCP StateCLOSEDSEQ«1)OOfCTLi$YNSYNSENTSYN-RECfIVEDACIMOOh CTLSYNIACKESTARLISHFDSVN-RFCfIVFnSF0.1WArK.7S1,CTl

3、71;ACKFSTABLISHFn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

4、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TCP协议客户端服务器UDP协议下实验: 程序流程图：UDP协议服务器客户端五、实验数据与实验结果Tcpclie ntsiseFfrady to connect 127成功.据input your word：>i am tcp client 戍功发送薮扌启16 >»5，te<

5、s>.input your word>hello there或功发送數据12 bytets>.input your uord：>back准备关闭客户端连接.Press any key to cont inue,TcperverUdp clie ntU 'CU5erski dDeslctopH«tClientDebugN etCJ ient.exePlfrflse inputhello192.168.1.10Please input1 U clientdata：say：hello data：,are ou ok?192,168.1say；i am ok

6、Pl»asfi input ilat：192.168.1.10 saj/：see you kchat end!Press any key to continuesayt hello data:say： i am client . are you ok? data:Udp serverH PU5erslci dDesktGpNetSrvDe bugN etSrv. exe"192>168.1.10Please input hello 192.168.1.IB Please input i Mi o k 192.168.1.10 chat end?Press any ke

7、y to cont inue六、实验用程序清单（要有注释）TCPSERVER:/ Module Name: tcpserver.cpp#in clude <win sock2.h> #in clude <stdio.h>#pragma comme nt(lib, "ws2_32.lib")void mai n(void)WSADATASOCKETSOCKETSOCKADDR_INSOCKADDR_INwsaData;Liste nin gSocket;NewC onnection;ServerAddr;Clie ntAddr;intint chari

8、ntClie ntAddrLe n;Port = 5150;Ret;DataBuffer1024;/ I nitialize Win sock version 2.2if (Ret = WSAStartup(MAKEWORD(2,2), &wsaData) != 0)prin tf("WSAStartup failed with error %dn". Ret);return;/ Create a new socket to liste ning for clie nt connections.if (Liste nin gSocket = socket(AF_IN

9、ET, SOCK_STREAM, IPPROTO_TCP)=INVALID_SOCKET)prin tf("socket failed with error %dn", WSAGetLastError();WSAClea nu p();return;ServerAddr.sin_family = AF_INET;ServerAddr.s in _port = hton s(Port);ServerAddr.sin_addr.s_addr = hton l(INADDR_ANY);/ Associate the address in formati on with the s

10、ocket using bind.if (bi nd(Liste nin gSocket, (SOCKADDR *)& ServerAddr, sizeof(ServerAddr)=SOCKET_ERROR)prin tf("bi nd failed with error %dn", WSAGetLastError();closesocket(Liste nin gSocket);WSAClea nu p();return;/ Liste n for clie nt connections. We used a backlog of 5 which is/ no r

11、mal for many applicati ons.if (liste n(Liste nin gSocket, 5) = SOCKET_ERROR)prin tf("liste n failed with error %dn", WSAGetLastError();closesocket(Liste nin gSocket);WSAClea nu p();return;prin tf("等待客户端连接端口%d.n", Port);/ Accept a new connection whe n one arrives.Clie ntAddrLe n =

12、 sizeof(Clie ntAddr);if (NewCo nn ection = accept(Liste nin gSocket, (SOCKADDR *) & Clie ntAddr,& Clie ntAddrLe n) = INVALID_SOCKET)prin tf("accept failed with error %dn", WSAGetLastError();closesocket(Liste nin gSocket);WSAClea nu p();return;printf(”成功建立连接%sn",inet_n toa(Clie

13、 ntAddr.s in _addr);closesocket(Liste nin gSocket);/ Start sending and receivi ng data on NewC onnection. 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prin tf(&qu

14、ot;port is %dn",hto ns(Clie ntAddr.sin_port); /打印端口号While(flag)接收数if (Ret = recv(NewCo nn ectio n, DataBuffer, sizeof(DataBuffer), 0) /据=SOCKET_ERROR)prin tf("recv failed with error %dn", WSAGetLastError();closesocket(NewC onnection);WSAClea nu p();return;if(i=strcmp(buffer,"back

15、")=O) /如果是指定字符断开连接flag=0;if(flag)*(DataBuffer+Ret)='O：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(NewC onn ecti on);/ When your applicati on is fini shed han dli ng the connections/ call WSAClea nup.WSAClea nu p();/ tcpclie nt.ex

16、e <server IP address>/TCPCLIENT:#i nclude <win sock2.h>#in clude <stdio.h>void mai n(void)WSADATAwsaData;SOCKETs;SOCKADDR_IN ServerAddr; intPort = 5150;intRet;Charsen dbuf100;/ I nitialize Win sock version 2.2if (Ret = WSAStartup(MAKEWORD(2,2), &wsaData) != 0)prin tf("WSAS

17、tartup failed with error %dn", Ret); return;/ Create a new socket to make a clie nt conn ecti on.if (s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)=INVALID_SOCKET)prin tf("socket failed with error %dn", WSAGetLastError();WSAClea nu p();return;ServerAddr.sin_family = AF_INET;ServerAddr.

18、s in _port = hton s(Port);本机ipServerAddr.sin_addr.s_addr = in et_addr("127.0.0.1");/ Make a connection to the server with socket s.prin tf("ready to conn ect %s:%d.n",i net_n toa(ServerAddr.s in _addr), hton s(ServerAddr.s in _port);if (co nn ect(s, (SOCKADDR *) & ServerAddr,

19、 sizeof(ServerAddr)=SOCKET_ERROR)prin tf("co nn ect failed with error %dn", WSAGetLastError(); closesocket(s);WSAClea nu p();return;printf（”客户端连接成功.n"）;/ At this point you can start sending or receivi ng data on/ the socket s. We will just send a hello message to the server.printf(&qu

20、ot;准备传送数据n");while(1)prin tf("i nput your word:")；fflush(stdi n);scan f("%s",se ndbuf);prin tf("n");if(strcmp(se ndbuf,"back")=O) /如果是指定字符退出连接break;sen d(s, sen dbuf, sizeof(se ndbuf), 0)if (Ret = sen d(s, sen dbuf, sizeof(se ndbuf), 0) = SOCKET_ERROR)pri

21、n tf("se nd failed with error %dn", WSAGetLastError(); closesocket(s);WSAClea nu p();return;printf(”成功发送数据 %d byte(s).n", Ret);/ When you are fini shed sending and receivi ng data on socket s,/ you should close the socket.printf(" 关闭连接.n");closesocket(s);/ When your applicat

22、i on is fini shed han dli ng the connection, call/ WSAClea nup.WSAClea nu p();UDPSERVER:#i ncludevWi nsock2.h>#i nclude<stdio.h>void main()WORD wVersio nRequested;WSADATA wsaData;int err;wVersio nRequested = MAKEWORD( 1, 1 );err = WSAStartup( wVersi on Requested, &wsaData );if ( err !=

23、0 )return;if ( LOBYTE( wsaData.wVersion ) != 1 |HIBYTE( wsaData.wVersio n ) != 1 )WSAClea nup(); return;SOCKET sockSrv=socket(AFN ET,SOCK_DGRAM,O); SOCKADDR_IN addrSrv;addrSrv.sin_addr.S_u n.S_addr=hto nl(INADDR_ANY); addrSrv.sin_family=AFN ET;addrSrv.sin_port=hto ns(6000);bin d(sockSrv,(SOCKADDR* )

24、&addrSrv,sizeof(SOCKADDR);char recvBuf100;char sen dBuf100;char tempBuf200;SOCKADDR_IN addrClie nt;int len=sizeof(SOCKADDR);while(1)recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR* )&addrClie nt,&len); if('q'=recvBuf0)sen dto(sockSrv,"q",strle n("q")+1,0,(SOCKADDR* )

25、&addrClie nt,le n); prin tf("chat en d!n");break;sprin tf(tempBuf,"%ssay: %s",i net_n toa(addrClie nt.sin_addr),recvBuf);prin tf("%sn",tempBuf);prin tf("Please in put data:' n"); gets(se ndBuf);sen dto(sockSrv,se ndBuf,strle n(se ndBuf)+1,0,(SOCKADDR*

26、)&addrClie nt ,le n);closesocket(sockSrv);WSAClea nup();UDPCLIENT:#i ncludevWi nsock2.h>#i nclude<stdio.h>void main()WORD wVersio nRequested;WSADATA wsaData;int err;wVersio nRequested = MAKEWORD( 1, 1 );err = WSAStartup( wVersi on Requested, &wsaData );if ( err != 0 )return;if ( LOBYTE( wsaData.wVersion ) != 1 |HIBYTE( wsaData.wVersio n ) != 1 )WSAClea nup();return;SOCKET sockClie nt=socket(AFN ET,SOCK_DGRAM,0); SOCKADDR_IN addrSrv;addrSrv.sin_addr.S_u n.S_addr=i net_addr("127.0.0.1"); addrSrv.sin_family=AFN ET;addrSrv.sin_port=hto ns(6000);char recv