09210a02操作系统课程设计第十四组说明书

设计目的：FTP服务是操作系统的重要功能之一。用高级语言编写和调试一个简单的opencdlcdmkdirrmdirputgetdele函数get_user()和get_pass()得到用户输入的用户名和ftp_login()函数用输入字符{charprintf("User(Pressforanonymous):");fgets(read_buf,sizeof(read_buf),stdin);}

voidget_pass()//{char foranonymousfgets(read_buf,sizeof(read_buf),stdin);strncpy(passwd,"anonymous",}{interr;if(ftp_send_cmd("USER",user,sock_control)<0)cmd_err_exit("Cannotsendmessage",1);;=if(err=={if(ftp_send_cmd("PASS",passwd,sock_control)<=0)cmd_err_exit("Cannotsendmessage",1);err=if(err230)//{return}elseif(err==531)//用{return}{printf("Passworderror!\n");return0;}{}}

printf("Usererror!\n");return0;intxconnect(structsockaddr_in*s_addrinttype)连接到服务器。intxconnect(structsockaddr_in*s_addr,inttype){structtimevalouttime;intset;ints=socket(AF_INET,SOCK_STREAM,0);if(s<0)cmd_err_exit("creatsocketerror!",set=setsockopt(s,SOL_SOCKET,SO_RCVTIMEO,&outtime,sizeof(outtime));if(set!=0){printf("setsocket%serrno:%d\n",strerror(errno),errno);cmd_err_exit("setsocket",1);}//connecttotheif(connect(s,(structsockaddr*)s_addr,sizeof(structsockaddr_in))<{printf("Can'tconnecttoserver%s,port%d\n",\}return}fgets(read_buf,sizeof(read_buf),ints=socket(AF_INET,SOCK_STREAM,0);if(s<0)cmd_err_exit("creatsocketerror!",//connecttotheif(connect(s,(structsockaddr*)s_addr,sizeof(structsockaddr_in))<{printf("Can'tconnecttoserver%s,port%d\n",\}连接到服务器，如果连接成功，connect0，如果不成功，返回-1。intftp_send_cmd(constchar*s1,constchar*s2,intsock_fd)intftp_send_cmd(constchar*s1,constchar*s2,int{charsend_buf[256];intsend_err,len;{{}{}}

strcat(send_buf,s2);len=send_err=send(sock_fd,send_buf,len,len=send_err=send(sock_fd,send_buf,len,if(send_err<printf("send()error!\n");returnsend_err;}//gettheserver'sreplymessagefromsock_fdintftp_get_reply(intsock_fd){staticintreply_code=0,count=0;charrcv_buf[512];count=read(sock_fd,rcv_buf,510);if(count>reply_code=return{if(count<=0)count=read(sock_fd,rcv_buf,510);}return}send_err=send(sock_fd,send_buf,len,intset=bind(get_sock,(structsockaddr*)&local_host,if(set!=0&&errno==11){_port=rand_local_port();}set=listen(get_sock,bind、listen函数开启数据流传输。{charusr_cmd[1024];intcmd_flag;{if(usr_cmd[0]=='\n')usr_cmd[strlen(usr_cmd)-1]='\0';cmd_flag=ftp_usr_cmd(usr_cmd);if(cmd_flag==15){char*cmd=strchr(usr_cmd,'');chardress_ftp[1024];if(cmd=={}{}

printf("commanderror!\n");while(*cmd=='')if(cmd==NULL||cmd=={}{

printf("commanderror!\n");char*dr="";dress_ftp[strlen(cmd)]='\0';if(dress_ftp=={printf("ConnectSeccessed!\n");}}

{}

printf("