文件传输协议的设计与实践.docx
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文件传输协议的设计与实践.docx
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文件传输协议的设计与实践
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客户机端程序清单:
#include
#include
#include
usingnamespacestd;//使用名称空间std
#pragmacomment(lib,"wsock32.lib")//将WinLib.lib库加入到工程中进行编译
#definePORT4523//定义端口号为4523
charbuf_send[1024];
charbuf_rec[1024];
charIP[20];
charfilename[20];
SOCKETsockClient;
SOCKADDR_INaddrServer;//定义表示地址的结构体addrServer,用来表示本地地址
//创建套接字
DWORDCreateSock()
{
WSADATAWSAData;//WSADATA结构被用来保存函数WSAStartup返回的WindowsSockets初始化信息
chara[20];
memset(a,0,20);//将a中内容初始化为0的ACI码,块长为20
if(WSAStartup(MAKEWORD(2,2),&WSAData)!
=0)//加载套接字库和进行套接字库的版本协商对WindowsSockets初始化
{
printf("sockinitfail!
\n");//初始化错误
return(-1);
}
if(strncmp(IP,a,20)==0)//比较IP与a
{
printf("pleaseinputtheIPofhost:
");
scanf("%s",&IP);}
//定义本地地址信息
addrServer.sin_family=AF_INET;//地址所属协议簇
addrServer.sin_addr.s_addr=inet_addr(IP);//计算机IP地址
addrServer.sin_port=htons(PORT);//协议端口号
return1;
}
DWORDConnectServer()//连接服务器
{
sockClient=socket(AF_INET,SOCK_STREAM,0);//创建套接字,SOCK_STREAM为面向连接型
if(sockClient==SOCKET_ERROR)
{
printf("sockcreatefail!
\n");
WSACleanup();
return(-1);
}
if(connect(sockClient,(structsockaddr*)&addrServer,sizeof(addrServer))==SOCKET_ERROR)//如果请求建立连接错误
{
printf("Connectfail\n");
memset(IP,0,20);
return(-1);
}
return
(1);
}
voidhelp()
{
charhelp[5];
cout<<"typehelplistthecommand:
";
cin>>help;
cout<<"CommandList:
"< <<"'help'……………………commandlist"< <<"'dir'…………………………directorylist"< <<"'cd'……………………………changecurrentdirectory"< <<"'pwd'……………………………listcurrentdirectory"< <<"'get'……………………………downloadfiles"< <<"'put'……………………………uploadfiles"< <<"'quit'……………………………exit! "< } //list作用? voidlist(SOCKETsock) { intnRead; while(true) { nRead=recv(sock,buf_rec,1024,0);//从一个套接口接收数据 if(nRead==SOCKET_ERROR) { printf("readresponseerror! \n"); exit (1); } if(nRead==0)//数据读取结束 break; //显示数据 buf_rec[nRead]='\0'; printf("%s",buf_rec); } } intSendFile(SOCKETdatatcps,FILE*file)//SOCKETdatatcps定义变量数据连接套接字 { printf("sendingfiledata.."); for(;;) { intr=fread(buf_send,1,1024,file);//从一个流中读数据 if(send(datatcps,buf_send,r,0)==SOCKET_ERROR) { printf("lostthrconnectiontoclient! \n"); closesocket(datatcps); return0; } if(r<1024)//文件传送结束 break; } closesocket(datatcps);//关闭接口 printf("done\n"); return1; } intProcessCmd() { intcount; charorder[10]; charparam[20]; charcommand[30]; FILE*fd; FILE*fd2; command[0]='\0'; CreateSock(); ConnectServer(); cout<<"pleaseinputorder: "< memset(order,0,10);//初始化为0 memset(param,0,20);//初始化为0 memset(command,0,30);//初始化为0 memset(buf_rec,0,1024);//初始化为0 memset(buf_send,0,1024);//初始化为0 cin>>order; strcat(command,order); if(strncmp(order,"get",3)==0||strncmp(order,"put",3)==0||strncmp(order,"cd",2)==0)//有一个输入要求正确 { cin>>param; strcat(command,""); strcat(command,param); } cout< strcpy(buf_send,command); if(send(sockClient,buf_send,sizeof(buf_send),0)<0) { cout<<"senddataerror! "< closesocket(sockClient); WSACleanup(); return0; } recv(sockClient,buf_rec,1024,0); cout< if(strncmp(command,"quit",4)==0) { closesocket(sockClient); WSACleanup(); return0; }//quit if(strncmp(buf_rec,"dir",3)==0) { list(sockClient); }//dir if(strncmp(order,"cd",2)==0){}//cd if(strncmp(order,"pwd",3)==0){}//pwd if(strncmp(buf_rec,"get",3)==0) { fd=fopen(param,"wb");//使用二进制方式 if(fd==NULL) { printf("openfile%sforweitefailed! \n",param); return0; } while((count=recv(sockClient,buf_rec,1024,0))>0) { fwrite(buf_rec,sizeof(char),count,fd);} fclose(fd); }//get if(strncmp(buf_rec,"put",3)==0) { strcpy(filename,buf_rec+9); fd2=fopen(filename,"rb"); if(fd2) { if(! SendFile(sockClient,fd2)) { printf("sendfailed! "); return0; } fclose(fd2); } else//打开文件失败 { strcpy(buf_send,"can'topenfile! \n"); if(send(sockClient,buf_send,1024,0)) return0; } }//put closesocket(sockClient); WSACleanup(); returnProcessCmd(); } intmain() { help(); ProcessCmd(); return0; } 服务器端程序清单: #include #include #include usingnamespacestd; #pragmacomment(lib,"wsock32.lib") #definePORT4523 charbuf_send[1024]; charbuf_rec[1024]; SOCKETsockSrv; //socket初始化 DWORDCreateSocket() { WSADATAWSAData;//WSADATA结构被用来保存函数WSAStartup返回的WindowsSockets初始化信息 if(WSAStartup(MAKEWORD(2,2),&WSAData)! =0)//WSAStartup完成winsock的初始化 {printf("socketinitializefailed! \n"); return(-1); } sockSrv=socket(AF_INET,SOCK_STREAM,0);//定义为面向连接的,返回值送给sockSrv if(sockSrv==SOCKET_ERROR) { printf("socketcreatefailed! \n"); WSACleanup();//中止WindowsSocketsDLL的使用 return(-1); } SOCKADDR_INaddrSrv;//TCP/IP使用SOCKADDR_IN定义地址 addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);//计算机IP地址 addrSrv.sin_port=htons(PORT);//协议端口号 addrSrv.sin_family=AF_INET;//地址所属协议簇 //绑定端口 if(bind(sockSrv,(structsockaddrFAR*)&addrSrv,sizeof(addrSrv))==SOCKET_ERROR) { printf("BindError"); return(-1); } return (1); } intSendFileRecord(SOCKETdatatcps,WIN32_FIND_DATA*pfd) //usedtosendresponsetoclient { charfilerecord[MAX_PATH+32]; FILETIMEft; FileTimeToLocalFileTime(&pfd->ftLastWriteTime,&ft);//将一个FILETIME结构转换成本地时间 SYSTEMTIMElastwtime;//系统时间 FileTimeToSystemTime(&ft,&lastwtime);//根据一个FILETIME结构的内容,装载一个SYSTEMTIME结构 char*dir=pfd->dwFileAttributes&FILE_ATTRIBUTE_DIRECTORY? " ""; sprintf(filerecord,"%04d-%02d-%02d%02d: %02d%5s%10d%-20s\n", lastwtime.wYear, lastwtime.wMonth, lastwtime.wDay, lastwtime.wHour, lastwtime.wMinute, dir, pfd->nFileSizeLow, pfd->cFileName); if(send(datatcps,filerecord,strlen(filerecord),0)==SOCKET_ERROR) { printf("Erroroccurswhensendingfilelist! \n"); return0; } return1; } //发送主机文件目录 intSendFileList(SOCKETdatatcps) { HANDLEhff; WIN32_FIND_DATAfd;//获取和更改文件属性 //搜索文件 hff=FindFirstFile("*",&fd); if(hff==INVALID_HANDLE_VALUE)//无效的返回值 { constchar*errstr="can'tlistfiles! \n"; printf("listfileerror! \n"); if(send(datatcps,errstr,strlen(errstr),0)==SOCKET_ERROR) { printf("erroroccurswhensendingfilelist! \n"); } closesocket(datatcps); return0; } BOOLfMoreFiles=TRUE; while(fMoreFiles) { //发送此项文件信息 if(! SendFileRecord(datatcps,&fd)) { closesocket(datatcps); return0; } //搜索下一个文件 fMoreFiles=FindNextFile(hff,&fd); } closesocket(datatcps); return1; } //发送数据 intSendFile(SOCKETdatatcps,FILE*file)//发送文件 { printf("sendingfiledata.."); for(;;) //从文件中循环读取数据并发送客户端 { intr=fread(buf_send,1,1024,file); if(send(datatcps,buf_send,r,0)==SOCKET_ERROR) { printf("losttheconnectiontoclient! \n"); closesocket(datatcps); return0; } if(r<1024)//文件传送结束 break; } closesocket(datatcps); printf("done\n"); return1; } DWORDProcessCmd() { if(listen(sockSrv,5)<0)//监听信号 { printf("Listenerror! "); return(-1); } printf("Listeningfortherequest……\n"); SOCKADDR_INaddrclient;//定义用于返回客户机端地址的结构 intlen=(sizeof(SOCKADDR_IN)); while (1) { SOCKETsockconn=accept(sockSrv,(SOCKADDR*)&addrclient,&len);//接受请求,产生新的套接字 if(sockconn==INVALID_SOCKET) continue; elseprintf("connectingfromclient\n"); while(true) { charfilename[20]; memset(buf_rec,0,1024); memset(buf_send,0,1024); if(recv(sockconn,buf_rec,1024,0)<=0) { break; } cout< "< if(strncmp(buf_rec,"dir",3)! =0&&strncmp(buf_rec,"get",3)! =0&&strncmp(buf_rec,"put",3)! =0&&strncmp(buf_rec,"pwd",3)! =0&&strncmp(buf_rec,"cd",2)! =0) continue;//有一个请求正确执行下面语句 if(strncmp(buf_rec,"dir",3)==0) { strcpy(buf_send,"dir-ing\n"); send(sockconn,buf_send,1024,0); SendFileList(sockconn);//发送当前所有文件名 }//dir if(strncmp(buf_rec,"cd",2)==0) { strcpy(filename,buf_rec+3); strcpy(buf_send,"cd-ing\n"); send(sockconn,buf_send,1024,0);//发送修改目录 SetCurrentDirectory(filename); continue; }//cd if(strncmp(buf_rec,"pwd",3)==0) { //获取当前目录,并放至回复报文中 if(! GetCurrentDirectory(1024,buf_send)) strcpy(buf_send,"pwd--can'tgetthecurrentdirectory! \n"); if(! send(sockconn,buf_send,1024,0)) printf("senderror! "); continue; }//pwd if(strncmp(buf_rec,"get",3)==0) { strcpy(filename,buf_rec+4); printf(filename); FILE*file; //处理下载文件请求 file=fopen(filename,"rb");//打开下载的文件 if(file) { sprintf(buf_send,"getfile%s\n",filename); if(! send(sockconn,buf_send,1024,0)) {fclose(file); return0;} else {//创建额外数据连接传送数据 if(! SendFile(sockconn,file)) return0; fclose(file);} }//file else//打开文件失败 { strcpy(buf_send,"can'topenfile! \n"); if(send(sockconn,buf_send,1024,0)) return0; }//lost }//get处理客户端的下载请求 if(strncmp(buf_rec,"put",3)==0) { FILE*fd; intcount; strcpy(filename,buf_rec+4); fd=fopen(filename,"wb"); if(fd==NULL) { printf("openfile%sforweitefailed! \n",filename); continue; } sprintf(buf_send,"putfile%s",filename); if(! send(sockconn,buf_send,1024,0)) {fclose(fd); return0; } while((count=recv(sockconn,buf_rec,1024,0))>0) fwrite(buf_rec,sizeof(char),count,fd);
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- 文件传输 协议 设计 实践