1、計算機網(wǎng)絡實驗報告實驗名稱Tcp與Udp的通信實現(xiàn)班級軟信1101學號20112329姓名杜海濤日期2013-7-13成績評閱人軟件學院實驗目的與意義IP，端1、編寫Tcp服務器與客戶端程序，服務器程序在客戶端連接后輸出客戶端信息（ 口號）2、編寫Tcp服務器與客戶端程序，客戶端在連接后可從鍵盤輸入字符，在服務器端實時 顯3、在2的基礎上，服務器判斷接收到的字符，如是某指定字符，則服務器退出監(jiān)聽4、編寫基于Udp的控制臺聊天程序通過tcp和udp的編程實現(xiàn) windows環(huán)境下的進程間的通信。二、實驗環(huán)境操作系統(tǒng)：Win dows 7實驗環(huán)境：Microsoft Visual C+6.0三、實

2、驗的預習內(nèi)容傳輸控制協(xié)議 TCP（Tra nsport Con trol Protocol）是一種面向連接的，可靠的傳輸層協(xié)議。面向連接是指一次正常的 TCP傳輸需要通過在TCP客戶端和TCP服務端建立 特定的虛電路連接來完成，該過程通常被稱為“三次握手”。舉例說明，TCP客戶端需要和TCP服務端建立連接，過程如圖所示LSTENTC3 StiteTCP PacketTCP StateCLOSEDSEQ«1)OOfCTLi$YNSYNSENTSYN-RECfIVEDACIMOOh CTLSYNIACKESTARLISHFDSVN-RFCfIVFnSF0.1WArK.7S1,CTl

3、71;ACKFSTABLISHFn第一步中，客戶端向服務端提出連接請求。這時TCP SYN標志置位。客戶端告訴服務端序列號區(qū)域合法，需要檢查。客戶端在TCP報頭的序列號區(qū)中插入自己的ISN。服務端收到該 TCP分段后，在第二步以自己的ISN回應（SYN標志置位），同時確認收到客戶端的第一個TCP分段（ACK標志置位）。在第三步中，客戶端確認收到服務端的ISN（ACK標志置位）。到此為止建立完整的 TCP連接，開始全雙工模式的數(shù)據(jù)傳輸過程。UDP(User Datagram Protocol ),即用戶數(shù)據(jù)報協(xié)議。它屬于"面向無連接的不可靠的傳輸”的類型。UDP中，每個數(shù)據(jù)包稱為“數(shù)據(jù)

4、報”，它的包頭只包含4個域，主要是地址信息與包的長度和校驗信息。與此對應，TCP包的頭信息有10多個域。因此UDP的網(wǎng)絡開銷一般要小于 TCP由于UDP在傳送數(shù)據(jù)過程中沒有建立連接，也不進行檢查，因此UDP是不可靠的，它不能保證數(shù)據(jù)報能安全無誤地到達目的主機。四、實驗的步驟與調(diào)試方法程序的流程圖TCP協(xié)議客戶端服務器UDP協(xié)議下實驗: 程序流程圖：UDP協(xié)議服務器客戶端五、實驗數(shù)據(jù)與實驗結果Tcpclie ntsiseFfrady to connect 127成功.據(jù)input your word：>i am tcp client 戍功發(fā)送藪扌啟16 >»5，te<

5、s>.input your word>hello there或功發(fā)送數(shù)據(jù)12 bytets>.input your uord：>back準備關閉客戶端連接.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、實驗用程序清單（要有注釋）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("等待客戶端連接端口%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(”成功建立連接%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(”等待接收數(shù)據(jù).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); /打印端口號While(flag)接收數(shù)if (Ret = recv(NewCo nn ectio n, DataBuffer, sizeof(DataBuffer), 0) /據(jù)=SOCKET_ERROR)prin tf("recv failed with error %dn", WSAGetLastError();closesocket(NewC onnection);WSAClea nu p();return;if(i=strcmp(buffer,"back

15、")=O) /如果是指定字符斷開連接flag=0;if(flag)*(DataBuffer+Ret)='O：printf("成功接收數(shù)據(jù) %s,共 %d byte(s).n", DataBuffer,Ret);printf(" 準備關閉客戶端連接.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);本機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（”客戶端連接成功.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;準備傳送數(shù)據(jù)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連接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(”成功發(fā)送數(shù)據(jù) %d byte(s).n", Ret);/ When you are fini shed sending and receivi ng data on socket s,/ you should close the socket.printf(" 關閉連接.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