《Linux网络编程》课程设计班级:姓名:指导老师:、设计背景Linux操作系统作为一个开源的操作系统被越来越多的人所应用，它的好处在于操作系统源代码的公开化！只要是基于GNU公约的软件你都可以任意使用并修改它的源代码。通过这次课程设计能更好的学习网络编程知识和掌握LINUX平台上应用程序设计开发的过程，将大学四年所学知识综合运用，为未来的工作学习打下基础。二、设计目的1、学习epoll跟FTP被动模式2、掌握linux基本命令，例如ls、cd、login；3、学会如何编译、运行三、环境要求1、centos64位操作系统2、gcc编译器四、设计原理4.1客户端客户端程序的主要任务有以下3个：（1）、分析用户输入的命令。（2）、根据命令向服务器发出请求（3）、接受服务器返回请求的结果客户端为用户提供了3种命令：（1）、get:从服务器下载文件（2）、list:列出客户端当前目录的内容（3）、quit离开4.2服务器端（1）、分析请求代码。（2）、根据请求代码做相应的处理（3）、等待返回结果或者应答信息五、软件测试结果server—DolpTiin令。同TP|g查揽H,™I+拆分◎控制位蚩根>medb>Ftp-master_l>server苗土土件士9网蜡baoziSLfftserveftserve,e>Ftaerve.h'：_回n显加即叫t———：==|（：—I设备■-U□txftxleCentOG7^fi6_64ft^erve.amaksflem日cm函[rrp.t^t官|」；二业硬母&倒器冒DB可卸熟®悻日1.0广日破盘驱痢S个文件如口K旧）「-：：m1rootrcot317291心i4u.A-mm£33316rtserve.c233316Ftserve.-233316ms
0.19876ronnectedtoL27_0.0.1_-'asswcrd:~rvr?TW-rv'i—,1rodrrotd5044-rv^w-rw.1rootrootL36B4320VVelcorie,serverready.Marne:anoriymoLEsuccesETullogirLrtclenDgetezbccsinqdataEonrecuon.RequestedrieaiztionsucceEsruLrtcienogetbaoa£26Closingdataconrectlon.RequestedrifeactionsuccessruLrtcient)1st六、部分主代码#include"ftserve.h"intmain(intargc,char*argv[]){intsock_listen,sock_control,port,pid;if(argc!=2){printf("usage:./ftserveport\n");exit(0);}port=atoi(argv[1]);//createsocketif((sock_listen=socket_create(port))<0){perror("Errorcreatingsocket");exit(1);}while(1){//waitforclientrequest//createnewsocketforcontrolconnectionif((sock_control=socket_accept(sock_listen))<0)break;//createchildprocesstodoactualfiletransferif((pid=fork())<0){perror("Errorforkingchildprocess");}elseif(pid==0){close(sock_listen);ftserve_process(sock_control);close(sock_control);exit(0);}close(sock_control);}close(sock_listen);return0;}/**Sendfilespecifiedinfilenameoverdataconnection,sendingcontrolmessageovercontrolconnectionHandlescaseofnullorinvalidfilename*/voidftserve_retr(intsock_control,intsock_data,char*filename){FILE*fd=NULL;chardata[MAXSIZE];size_tnum_read;fd=fopen(filename,"r");if(!fd){//senderrorcode(550Requestedactionnottaken)send_response(sock_control,550);}else{//sendokay(150Filestatusokay)send_response(sock_control,150);do{num_read=fread(data,1,MAXSIZE,fd);if(num_read<0){printf("errorinfread()\n");}//sendblockif(send(sock_data,data,num_read,0)<0)perror("errorsendingfile\n");}while(num_read>0);//sendmessage:226:closingconn,filetransfersuccessfulsend_response(sock_control,226);fclose(fd);}}/**SendlistoffilesincurrentdirectoryoverdataconnectionReturn-1onerror,0onsuccess*/intftserve_list(intsock_data,intsock_control){chardata[MAXSIZE];size_tnum_read;FILE*fd;intrs=system("ls-l|tail-n+2>tmp.txt");if(rs<0){exit(1);}fd=fopen("tmp.txt","r");if(!fd){exit(1);}/*Seektothebeginningofthefile*/fseek(fd,SEEK_SET,0);send_response(sock_control,1);//startingmemset(data,0,MAXSIZE);while((num_read=fread(data,1,MAXSIZE,fd))>0){if(send(sock_data,data,num_read,0)<0){perror("err");}memset(data,0,MAXSIZE);}fclose(fd);send_response(sock_control,226);//send226return0;}/**OpendataconnectiontoclientReturns:socketfordataconnectionor-1onerror*/intftserve_start_data_conn(intsock_control){charbuf[1024];intwait,sock_data;//Waitforgo-aheadoncontrolconnif(recv(sock_control,&wait,sizeofwait,0)<0){perror("Errorwhilewaiting");return-1;//Getclientaddressstructsockaddr_inclient_addr;socklen_tlen=sizeofclient_addr;getpeername(sock_control,(structsockaddr*)&client_addr,&len);inet_ntop(AF_INET,&client_addr.sin_addr,buf,sizeof(buf));//Initiatedataconnectionwithclientif((sock_data=socket_connect(CLIENT_PORT_ID,buf))<0)return-1;returnsock_data;}/**Authenticateauser'scredentialsReturn1ifauthenticated,0ifnot*/intftserve_check_user(char*user,char*pass){charusername[MAXSIZE];charpassword[MAXSIZE];char*pch;charbuf[MAXSIZE];char*line=NULL;size_tnum_read;size_tlen=0;FILE*fd;intauth=0;fd=fopen(".auth","r");if(fd==NULL){perror("filenotfound");exit(1);}while((num_read=getline(&line,&len,fd))!=-1){memset(buf,0,MAXSIZE);strcpy(buf,line);pch=strtok(buf,"");strcpy(username,pch);if(pch!=NULL){pch=strtok(NULL,"");strcpy(password,pch);}//removeendoflineandwhitespacetrimstr(password,(int)strlen(password));if((strcmp(user,username)==0)&&(strcmp(pass,password)==0)){auth=1;break;}}free(line);fclose(fd);returnauth;}/***Loginconnectedclient*/intftserve_login(intsock_control){charbuf[MAXSIZE];charuser[MAXSIZE];charpass[MAXSIZE];memset(user,0,MAXSIZE);memset(pass,0,MAXSIZE);memset(buf,0,MAXSIZE);//Waittorecieveusernameif((recv_data(sock_control,buf,sizeof(buf)))==-1){perror("recverror\n");exit(1);}inti=5;intn=0;while(buf[i]!=0)user[n++]=buf[i++];//tellclientwe'rereadyforpasswordsend_response(sock_control,331);//Waittorecievepasswordmemset(buf,0,MAXSIZE);if((recv_data(sock_control,buf,sizeof(buf)))==-1){perror("recverror\n");exit(1);}i=5;n=0;while(buf[i]!=0){pass[n++]=buf[i++];}return(ftserve_check_user(user,pass));}/**WaitforcommandfromclientandsendresponseReturnsresponsecode*/intftserve_recv_cmd(intsock_control,char*cmd,char*arg){intrc=200;charbuffer[MAXSIZE];memset(buffer,0,MAXSIZE);memset(cmd,0,5);memset(arg,0,MAXSIZE);//Waittorecievecommandif((recv_data(sock_control,buffer,sizeof(buffer)))==-1){perror("recverror\n");return-1;}strncpy(cmd,buffer,4);char*tmp=buffer+5;strcpy(arg,tmp);if(strcmp(cmd,"QUIT")==0){rc=221;}elseif((strcmp(cmd,"USER")==0)||(strcmp(cmd,"PASS")==0)||(strcmp(cmd,"LIST")==0)||(strcmp(cmd,"RETR")==0)){rc=200;}else{//invalidcommandrc=502;}send_response(sock_control,rc);returnrc;}/***Childprocesshandlesconnectiontoclient*/voidftserve_process(intsock_control){intsock_data;charcmd[5];chararg[MAXSIZE];//Sendwelcomemessagesend_response(sock_control,220);//Authenticateuserif(ftserve_login(sock_control)==1){send_response(sock_control,230);}else{send_response(sock_control,430);exit(0);while(1){//Waitforcommandintrc=ftserve_recv_cmd(sock_control,cmd,arg);if((rc<0)||(rc==221)){break;}if(rc==200){//Opendataconnectionwithclientif((sock_data=ftserve_start_data_conn(sock_control))<0){close(sock_control);exit(1);}//Executecommandif(strcmp(cmd,"LIST")==0){//Dolistftserve_list(sock_data,sock_control);}elseif(strcmp(cmd,"RETR")==0){//Dogetftserve_retr(sock_control,sock_data,arg);}//Closedataconnectionclose(sock_data);}}}七、设计
总结
初级经济法重点总结下载党员个人总结TXt高中句型全总结.doc高中句型全总结.doc理论力学知识点总结pdf
通过本次的linux程序与设计课程设计让我们学会使用linux系统和socket,极大的丰富了linux系统下编程和网络方面的知识，锻炼了动手能力，为以后的工作学习打下了坚实的基础。
浙公网安备 33021202002483