實(shí)驗(yàn)一-文件傳輸協(xié)議設(shè)計(jì)

1、實(shí)驗(yàn)一：文件傳輸協(xié)議的設(shè)計(jì)與實(shí)現(xiàn) 目錄1.實(shí)驗(yàn)設(shè)計(jì)目的和要求2.背景知識3.課程設(shè)計(jì)分析4.程序清單5.運(yùn)行結(jié)果6.總結(jié)1. 課程設(shè)計(jì)目的和要求文件傳輸是各種計(jì)算機(jī)的網(wǎng)絡(luò)的基本功能，文件傳送協(xié)議是一種最基本的應(yīng)用層協(xié)議。它是按照客戶或服務(wù)器模式進(jìn)行的工作，提供交式的訪問。是INTERNRT使用最廣泛的協(xié)議之一。以及深入了解計(jì)算機(jī)網(wǎng)絡(luò)是建立在TCP/IP網(wǎng)絡(luò)體系結(jié)構(gòu)上。用 socket 編程接口編寫倆個程序，分別為客戶程序和服務(wù)器程序1 掌握TCP/IP 網(wǎng)絡(luò)應(yīng)用程序基本的設(shè)計(jì)方法；2 用socket 編程接口編寫兩個程序，分別為客戶程序(client.c)和服務(wù)器程序（server.c）；3

2、撰寫課程設(shè)計(jì)說明書。裝訂后的課程設(shè)計(jì)說明書不少于10面（含封面、任務(wù)書、目錄、正文、參考文獻(xiàn)、成績評定表、封底）。2. 背景知識第一個FTP的RFC由A.K.Bhushan 在1971年提出，同時由MIT與Harvard實(shí)驗(yàn)實(shí)現(xiàn)，RFC 172提供了主機(jī)間文件傳輸?shù)囊粋€用戶級協(xié)議。長期發(fā)展過程由于底層協(xié)議從NCP改變?yōu)門CP，RFC765定義了采用TCP的FCP. FTP協(xié)議在今天已經(jīng)發(fā)展成熟，應(yīng)用也越來越廣很多開發(fā)的比較成熟的FTP客戶端軟件已經(jīng)得到了廣泛的應(yīng)用.3. 課程設(shè)計(jì)分析 Server端 Client端創(chuàng)建ServerSocket對象，在某端口提供監(jiān)聽服務(wù)Client端 等待來自C

3、lient端的服務(wù)請求 接受Client端的請求，用返回的 創(chuàng)建Socket對象，向Server Socket建立連接 的監(jiān)聽端口請求 通過向Socket中讀寫數(shù)據(jù)來 通過向新的Socket中讀寫數(shù)與Client端通信 據(jù)來與Server端通信關(guān)閉Socket，結(jié)束與Server端的通信 關(guān)閉Socket，結(jié)束與當(dāng)前 Client的通信，等待其他請求關(guān)閉ServerSocket對象，結(jié)束監(jiān)聽服務(wù)4.程序清單：1. 服務(wù)器源代碼：#include <Winsock2.h>#include <stdio.h>#include <iostream>using na

4、mespace std;#pragma comment(lib, "wsock32.lib")#define PORT 4523char buf_send1024;char buf_rec1024;SOCKET sockSrv;/socket初始化DWORD CreateSocket()WSADATA WSAData;/WSADATA結(jié)構(gòu)被用來保存函數(shù)WSAStartup返回的Windows Sockets初始化信息if(WSAStartup(MAKEWORD(2,2),&WSAData)!=0)/WSAStartup完成winsock的初始化printf(&quo

5、t;socket initialize failed!n");return (-1);sockSrv=socket(AF_INET,SOCK_STREAM,0);/定義為面向連接的,返回值送給sockSrvif(sockSrv=SOCKET_ERROR)printf("socket create failed ! n");WSACleanup();/中止Windows Sockets DLL的使用return(-1);SOCKADDR_IN addrSrv;/TCP/IP使用SOCKADDR_IN 定義地址addrSrv.sin_addr.S_un.S_addr=

6、htonl(INADDR_ANY);/計(jì)算機(jī)IP地址addrSrv.sin_port=htons(PORT);/協(xié)議端口號addrSrv.sin_family=AF_INET;/地址所屬協(xié)議簇/綁定端口if(bind(sockSrv,(struct sockaddr FAR *)&addrSrv,sizeof(addrSrv)=SOCKET_ERROR)printf("Bind Error");return(-1);return (1);int SendFileRecord(SOCKET datatcps,WIN32_FIND_DATA *pfd)/用于回復(fù)給客戶端

7、char filerecordMAX_PATH+32;FILETIME ft;FileTimeToLocalFileTime(&pfd->ftLastWriteTime,&ft);/將一個FILETIME結(jié)構(gòu)轉(zhuǎn)換成本地時間 SYSTEMTIME lastwtime;/系統(tǒng)時間FileTimeToSystemTime(&ft,&lastwtime);/根據(jù)一個FILETIME結(jié)構(gòu)的內(nèi)容，裝載一個SYSTEMTIME結(jié)構(gòu) char *dir=pfd->dwFileAttributes&FILE_ATTRIBUTE_DIRECTORY?"

8、<DIR>":" "sprintf(filerecord,"%04d-%02d-%02d %02d:%02d %5s %10d %-20sn", lastwtime.wYear,lastwtime.wMonth,lastwtime.wDay,lastwtime.wHour,lastwtime.wMinute,dir,pfd->nFileSizeLow,pfd->cFileName);if(send(datatcps,filerecord,strlen(filerecord),0)=SOCKET_ERROR)/發(fā)送回復(fù)失敗

9、printf("Error occurs when sending file list!n");return 0;return 1;/發(fā)送主機(jī)文件目錄int SendFileList(SOCKET datatcps)HANDLE hff;WIN32_FIND_DATA fd; /獲取和更改文件屬性hff=FindFirstFile("*",&fd);/搜索文件if(hff=INVALID_HANDLE_VALUE)/搜索無效返回值const char *errstr="can't list files!n"cout&l

10、t;<"list file error!"<<endl;if(send(datatcps,errstr,strlen(errstr),0)=SOCKET_ERROR)cout<<"error occurs when sending file list!"<<endl;closesocket(datatcps);return 0;BOOL fMoreFiles=TRUE;/BOOL型，返回值為大于0的整數(shù)時為TRUE，返回值為0時候，為FALSE，返回值為-1時為ERROR。while(fMoreFiles)/發(fā)送

11、此項(xiàng)文件信息if(!SendFileRecord(datatcps,&fd)/發(fā)送失敗closesocket(datatcps);return 0;/搜索下一個文件fMoreFiles=FindNextFile(hff,&fd);closesocket(datatcps);return 1;/發(fā)送數(shù)據(jù)int SendFile(SOCKET datatcps,FILE* file)/發(fā)送文件printf("sending file data.");for(;)/從文件中循環(huán)讀取數(shù)據(jù)并發(fā)送客戶端int r=fread(buf_send,1,1024,file);

12、if(send(datatcps,buf_send,r,0)=SOCKET_ERROR)printf("lost the connection to client!n");closesocket(datatcps);return 0;if(r<1024)/文件傳送結(jié)束break;closesocket(datatcps);printf("donen");return 1;DWORD ProcessCmd()if(listen(sockSrv,5)<0)/監(jiān)聽信號cout<<"Listen error!"<

13、<endl;return(-1);cout<<"Listening for the request"<<endl;SOCKADDR_IN addrclient;/定義用于返回客戶機(jī)端地址的結(jié)構(gòu)int len=(sizeof(SOCKADDR_IN);while(1)SOCKET sockconn=accept(sockSrv,(SOCKADDR*)&addrclient,&len);/接受請求，產(chǎn)生新的套接字if(sockconn=INVALID_SOCKET)continue;else cout<<"co

14、nnecting from client"<<endl;while(true)char filename20;memset(buf_rec,0,1024);memset(buf_send,0,1024);if(recv(sockconn,buf_rec,1024,0)<=0)break; cout<<endl<<"the command is:"<<buf_rec<<endl;if(strncmp(buf_rec,"dir",3)!=0&&strncmp(buf_

15、rec,"get",3)!=0&&strncmp(buf_rec,"put",3)!=0)continue;/有一個請求正確執(zhí)行下面語句if(strncmp(buf_rec,"dir",3)=0)strcpy(buf_send,"dir-ingn");send(sockconn,buf_send,1024,0);SendFileList(sockconn);/發(fā)送當(dāng)前所有文件名/dirif (strncmp(buf_rec,"get",3)=0) strcpy(filename,

16、buf_rec+4);cout<<filename;FILE *file; /處理下載文件請求file=fopen(filename,"rb");/打開下載的文件if(file) sprintf(buf_send,"get file %sn",filename);if(!send(sockconn,buf_send,1024,0)fclose(file);return 0;else/創(chuàng)建額外數(shù)據(jù)連接傳送數(shù)據(jù)if(!SendFile(sockconn,file)return 0;fclose(file);/fileelse/打開文件失敗strc

17、py(buf_send,"can't open file!n");if(send(sockconn,buf_send,1024,0)return 0;/get 處理客戶端的下載請求if(strncmp(buf_rec,"put",3)=0)FILE *fd;int count;strcpy(filename,buf_rec+4); fd=fopen(filename,"wb");if(fd=NULL)printf("open file %s for weite failed!n",filename);con

18、tinue;sprintf(buf_send,"put file %s",filename);if(!send(sockconn,buf_send,1024,0)fclose(fd);return 0;while(count=recv(sockconn,buf_rec,1024,0)>0)fwrite(buf_rec,sizeof(char),count,fd);fclose(fd);continue;/put 處理客戶端的上傳請求int main()CreateSocket();ProcessCmd();return(1);2. 客戶端程序源代碼：#include

19、<Winsock2.h>#include <stdio.h>#include <iostream>using namespace std;/使用名稱空間std#pragma comment(lib, "wsock32.lib")/將WinLib.lib庫加入到工程中進(jìn)行編譯#define PORT 4523/定義端口號為4523char send_str1024;char rec_str1024;char IP20;char filename20;SOCKET sockClient;SOCKADDR_IN addrServer;/定義表示

20、地址的結(jié)構(gòu)體addrServer，用來表示本地地址/創(chuàng)建套接字DWORD CreateSock()/本地信息addrServer.sin_family=AF_INET;/地址所屬協(xié)議簇/AF表示ADDRESS FAMILY 地址族/ htons的功能：將一個無符號短整型數(shù)值轉(zhuǎn)換為網(wǎng)絡(luò)字節(jié)序addrServer.sin_port=htons(PORT);/協(xié)議端口號WSADATA WSAData;/WSADATA結(jié)構(gòu)被用來保存函數(shù)WSAStartup返回的Windows Sockets初始化信息WORD wVersionRequsdted;int err;wVersionRequsdted=MA

21、KEWORD(2,2);err=WSAStartup(wVersionRequsdted,&WSAData);if(err!=0)printf("sock init fail!n");return(-1);cout<<"please input the IP of host："scanf("%s",&IP);addrServer.sin_addr.s_addr=inet_addr(IP);/計(jì)算機(jī)IP地址return(1);DWORD ConnectServer() /連接服務(wù)器sockClient=soc

22、ket(AF_INET,SOCK_STREAM,0);/創(chuàng)建套接字，SOCK_STREAM為面向連接型if(sockClient=SOCKET_ERROR)printf("sock create fail! n");WSACleanup();/中止Windows Sockets DLL的使用.return(-1);if(connect(sockClient,(struct sockaddr *)&addrServer,sizeof(addrServer)=SOCKET_ERROR)/如果請求建立連接錯誤printf("Connect fail n"

23、;);memset(IP,0,20);return(-1);return(1);void help()cout<<"help List："<<endl;cout<<"dirdirectory list "<<endl;cout<<"getdownload files"<<endl;cout<<"putupload files "<<endl;cout<<"quitexit !"<&l

24、t;endl; /list讀取服務(wù)器列表void list(SOCKET sock)int nRead;while(true)nRead=recv(sock,rec_str,1024,0);/從一個套接口接收數(shù)據(jù)if(nRead=SOCKET_ERROR)cout<<"read response error!"<<endl;exit(1);if(nRead=0)/數(shù)據(jù)讀取結(jié)束break;/顯示數(shù)據(jù)rec_strnRead='0'printf("%s",rec_str);int SendFile(SOCKET dat

25、atcps,FILE* file)/SOCKET datatcps定義變量數(shù)據(jù)連接套接字 cout<<"sending file data."<<endl;for(;)int r=fread(send_str,1,1024,file);/從一個流中讀數(shù)據(jù) if(send(datatcps,send_str,r,0)=SOCKET_ERROR)printf("lost the connection to client!n");closesocket(datatcps);return 0;if(r<1024)/文件傳送結(jié)束bre

26、ak;closesocket(datatcps);/關(guān)閉接口printf("donen");return(1);int Cprocess()int count;char order10;char param20;char command30;FILE *fd;FILE *fd2;command0='0'CreateSock();ConnectServer();cout<<"please input order :"<<endl;memset(order,0,10);/初始化為0memset(param,0,20);

27、/初始化為0memset(command,0,30);/初始化為0memset(rec_str,0,1024);/初始化為0memset(send_str,0,1024);/初始化為0cin>>order;strcat(command,order);if(strncmp(order,"get",3)=0|strncmp(order,"put",3)=0)/輸入請求，有一個輸入要求正確，輸入目標(biāo)文件名cin>>param;strcat(command," ");strcat(command,param);cout

28、<<command<<endl;strcpy(send_str,command);if(send(sockClient,send_str,sizeof(send_str),0)<0)cout<<"send data error!"<<endl;closesocket(sockClient);WSACleanup();return 0;recv(sockClient,rec_str,1024,0);/接受鏈接數(shù)據(jù)，放入rec_strcout<<rec_str<<endl;if(strncmp(command,"quit",4)=0)closesocket(sockClient);WSACleanup();return