linux开发板C实现ftp客户端

由于需要和windows服务器连接，使用的是ftp通信协议，windows上使用filezilla作为服务器

关于filazilla参考前面记录的  https://www.cnblogs.com/ChenChangXiong/p/11001004.html

会有linux开发板的ftp工具，但是实际上也是socket，所有使用socket就可以做到ftp文件传输，这样也可以根据实际情况比较好的控制，所以我 使用C实现了ftp的客户端程序。

以下是登陆代码代码

int login()
	{
	//初始化端口信息
	struct sockaddr_in serv_addr;
	char senddate,recvdate;
	char sendline[MAXSIZE],recvline[MAXSIZE];
	struct hostent *host;
	//获取hostent中相关参数
	char name[MAXSIZE],password[MAXSIZE];
	printf("please enter the hostname ");
	printf("ftp->");
	fflush(stdout);
	//创建socket
	if( (control_sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
	printf("create socket error: %s(errno: %d) ", strerror(errno),errno);
	return -1 ;
	//exit(0);
	}
	memset(&serv_addr, 0, sizeof(serv_addr));
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_port=htons(SERV_PORT);
	serv_addr.sin_addr.s_addr=INADDR_ANY;
	//点分十进制转化为二进制整数地址
	if(inet_pton(AF_INET, FTP_CONNECT_IP, &serv_addr.sin_addr) <= 0){
	printf("inet_pton error for %s ", FTP_CONNECT_IP);
	close(control_sockfd);
	return -1 ;
	//exit(0);
	}
	//调用connect函数发起连接
	if((connect(control_sockfd,(SA*)&serv_addr,sizeof(serv_addr)))<0)
	{
	printf("连接失败 ");
	login_yes=0;
	}
	///printf("连接到 %d--->>>/n",&serv_addr.sin_addr);
	recvdate=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(recvdate==-1)
	{
	printf("recvdate is connect error/n");
	login_yes=0;
	}
	else if(strncmp(recvline,"220",3)==0)
	{
	printf("220 连接成功，请输入用户名 ");
	login_yes=1;
	}
	else
	{
	printf("220 connect is error!");
	login_yes=0;
	}
	//ftp用户登录主体部分
	int sendbytes,recvbytes;
	zeromery(name,1024);
	zeromery(password,1024);
	zeromery(recvline,1024);
	zeromery(sendline,1024);
	//printf("自动登录 用户名：windows-ftp ") ;
	strcat(sendline,"USER ");
	strcat(sendline,"windows-ftp");
	strcat(sendline," ");
	printf("--->%s ",sendline);
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes==-1)
	{
	printf("send is wrong ");
	login_yes=0;
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(strncmp(recvline,"331",3)==0)
	{
	//printf("331 please specify the password./n");
	printf("331 请输入密码 ");
	}
	else
	{
	printf("recv date is error./n");
	login_yes=0;
	}
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	sleep(1) ;
	printf("密码：111111 ") ;
	strcat(sendline,"PASS ");
	strcat(sendline,"111111");
	strcat(sendline," ");
	printf("--->%s ",sendline);
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes==-1)
	{
	printf("pass send is error ");
	login_yes=0;
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(strncmp(recvline,"230",3)==0)
	{
	printf("登录成功! ");
	login_yes=1;
	}
	else
	{
	printf("pass recv is error ");
	login_yes=0;
	}
	if(login_yes==0)
	{
	close(control_sockfd); //登陆失败 关闭接口
	return -1 ;
	}
	//进入到对应子路径
	//////ftp_changdir("001",control_sockfd); //cd
	return control_sockfd;
	}

实现了登陆，就意味着可以和service进行通信了，接下来的事情九四read  和 write  或者send和rev的事情。

#include "client_ftp.h"
	static char First_login = 0 ;
	//int main(int argc,char **argv)
	//{
	// printf("ftp>");
	// char command[MAXSIZE];
	// char*cmd;
	// login();
	// if(login_yes==1)
	// {
	// while(1)
	// {
	//comm:
	// sleep(1);
	// printf("ftp>");
	// zeromery(command,1024);
	// scanf("%s",command);
	// cmd=command;
	// while(*(cmd)==' ')
	// cmd++;
	// if(strncmp(cmd,"pwd",3)==0)
	// {
	// ftp_pwd(control_sockfd);
	// }
	// if(strncmp(cmd,"mkdir",5)==0)
	// {
	// char path[60];
	// zeromery(path,60);
	// printf("创建的路径名: ");
	// scanf("%s",path);
	// printf("s ",path);
	// ftp_creat_mkd(path,control_sockfd);
	// }
	// if(strncmp(cmd,"back",4)==0)
	// {
	// ftp_back(control_sockfd);
	// ftp_pwd(control_sockfd);
	// }
	// if(strncmp(cmd,"cd",2)==0)
	// {
	// int i;
	// char path[60];
	// zeromery(path,60);
	// printf("要到的路径：");
	// scanf("%s",path);
	// printf("%s ",path);
	// ftp_changdir(path,control_sockfd);
	// }
	// if(strncmp(cmd,"get",3)==0)
	// {
	// ftp_pwd(control_sockfd);
	// ftp_download(control_sockfd);
	// }
	// if(strncmp(cmd,"up",3)==0)
	// {
	// ftp_pwd(control_sockfd);
	// ftp_up(control_sockfd);
	// }
	// if(strncmp(cmd,"quit",4)==0)
	// {
	// printf("bye^_^ ");
	// close(control_sockfd);
	// break;
	// }
	// ///printf("支持 list,pwd,mkdir,back,cd,up,get ");
	// }
	//
	// }
	// else if(login_yes==0)
	// {
	// int i;//不成功登录下最多还有两次机会，如果不能在两次登录，则，关闭链接。
	// printf("Can not login vsftpd");
	// for(i=2;i>0;i--)
	// {
	// printf("你还有 %d 登录机会 ",i);
	// login();
	// if(login_yes==1)
	// {
	// goto comm;
	// }
	// }
	// if(i==0)
	// {
	// printf("你不能在登录！ ");
	// close(control_sockfd);
	// }
	//
	// }
	// else if (strncmp(cmd,"quit",4)==0)
	// {
	// ftp_quit(control_sockfd);
	// close(control_sockfd);
	//
	// }
	//
	// return 0;
	//}
	int login()
	{
	//初始化端口信息
	struct sockaddr_in serv_addr;
	char senddate,recvdate;
	char sendline[MAXSIZE],recvline[MAXSIZE];
	struct hostent *host;
	//获取hostent中相关参数
	char name[MAXSIZE],password[MAXSIZE];
	printf("please enter the hostname ");
	printf("ftp->");
	fflush(stdout);
	//创建socket
	if( (control_sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
	printf("create socket error: %s(errno: %d) ", strerror(errno),errno);
	return -1 ;
	//exit(0);
	}
	memset(&serv_addr, 0, sizeof(serv_addr));
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_port=htons(SERV_PORT);
	serv_addr.sin_addr.s_addr=INADDR_ANY;
	//点分十进制转化为二进制整数地址
	if(inet_pton(AF_INET, FTP_CONNECT_IP, &serv_addr.sin_addr) <= 0){
	printf("inet_pton error for %s ", FTP_CONNECT_IP);
	close(control_sockfd);
	return -1 ;
	//exit(0);
	}
	//调用connect函数发起连接
	if((connect(control_sockfd,(SA*)&serv_addr,sizeof(serv_addr)))<0)
	{
	printf("连接失败 ");
	login_yes=0;
	}
	///printf("连接到 %d--->>>/n",&serv_addr.sin_addr);
	recvdate=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(recvdate==-1)
	{
	printf("recvdate is connect error/n");
	login_yes=0;
	}
	else if(strncmp(recvline,"220",3)==0)
	{
	printf("220 连接成功，请输入用户名 ");
	login_yes=1;
	}
	else
	{
	printf("220 connect is error!");
	login_yes=0;
	}
	//ftp用户登录主体部分
	int sendbytes,recvbytes;
	zeromery(name,1024);
	zeromery(password,1024);
	zeromery(recvline,1024);
	zeromery(sendline,1024);
	//printf("自动登录 用户名：windows-ftp ") ;
	strcat(sendline,"USER ");
	strcat(sendline,"windows-ftp");
	strcat(sendline," ");
	printf("--->%s ",sendline);
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes==-1)
	{
	printf("send is wrong ");
	login_yes=0;
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(strncmp(recvline,"331",3)==0)
	{
	//printf("331 please specify the password./n");
	printf("331 请输入密码 ");
	}
	else
	{
	printf("recv date is error./n");
	login_yes=0;
	}
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	sleep(1) ;
	printf("密码：111111 ") ;
	strcat(sendline,"PASS ");
	strcat(sendline,"111111");
	strcat(sendline," ");
	printf("--->%s ",sendline);
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes==-1)
	{
	printf("pass send is error ");
	login_yes=0;
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(strncmp(recvline,"230",3)==0)
	{
	printf("登录成功! ");
	login_yes=1;
	}
	else
	{
	printf("pass recv is error ");
	login_yes=0;
	}
	if(login_yes==0)
	{
	close(control_sockfd); //登陆失败 关闭接口
	return -1 ;
	}
	//进入到对应子路径
	//////ftp_changdir("001",control_sockfd); //cd
	return control_sockfd;
	}
	//数组初始化
	void zeromery(char *a,int len)
	{
	int i;
	len=sizeof(a);
	for(i=0;i<len;i++)
	{
	a[i]=0;
	}
	}
	//quit函数,control_sockfd,通过实参传递
	void ftp_quit(int control_sockfd )
	{
	char sendline[1024];
	char recvline[1024];
	int recvbytes;
	int sendbytes;
	First_login = 0 ; //重新恢复到开始目录
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	strcat(sendline,"QUIT");
	strcat(sendline," ");
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf("quit send is error! ");
	goto END;
	//exit(1);
	}
	recvbytes=recv(control_sockfd,recvline,strlen(recvline),0);
	if(strncmp(recvline,"221",3)==0)
	{
	printf("221 bye!^_^");
	goto END;
	//exit(1);
	}
	else
	{
	printf("quit recv is error! ");
	goto END;
	//exit(1);
	}
	END:
	close(control_sockfd);
	return ;
	}
	//mkd,在所在路径中创建目录 函数
	void ftp_creat_mkd(char *path,int control_sockfd)
	{
	char sendline[1024];
	char recvline[1024];
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	int recvbytes,sendbytes;
	int issuccess;
	strcat(sendline,"MKD ");
	strcat(sendline,path);
	strcat(sendline," ");
	printf("%s ",sendline);
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf("mkd send is error!");
	exit(1);
	}
	recvbytes=recv(control_sockfd,recvline,strlen(recvline),0);
	if(strncmp(recvline,"257",3)==0)
	{
	issuccess=1;
	}
	else
	{
	issuccess=0;
	}
	}
	//改变目录函数chdir
	void ftp_changdir(char *dir,int control_sockfd)
	{
	char sendline[1024];
	char recvline[1024];
	int recvbytes,sendbytes;
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	strcat(sendline,"CWD ");
	strcat(sendline,dir);
	strcat(sendline," ");
	printf("%s ",sendline);
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf("cwd send is error! ");
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(recvbytes<0)
	{
	printf("cwd recv is error! ");
	}
	if(strncmp(recvline,"250",3)==0)
	{
	char buf[55];
	snprintf(buf,39,">>> %s ",recvline);
	printf("%s ",buf);
	}
	else
	{
	printf("cwd chdir is error! ");
	return ;
	//exit(1);
	}
	//登录成功
	First_login = 1 ;
	}
	//pwd 命令函数
	//在应答中返回当前工作目录，“pwd”+
	void ftp_pwd(int control_sockfd)
	{
	int recvbytes,sendbytes;
	char sendline[1024],recvline[1024];
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	strcat(sendline,"PWD");
	strcat(sendline," ");
	if(First_login==0)
	{
	//进入到对应子路径
	//////ftp_changdir("001",control_sockfd); //cd
	}
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf("pwd,send is error ");
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(strncmp(recvline,"257",3)==0)
	{
	int i=0;
	char *ptr;
	char currendir[1024];
	zeromery(currendir,1024);
	ptr=recvline+5;
	while(*(ptr)!='"')
	{
	currendir[i++]=*(ptr);
	ptr++;
	}
	currendir[i]='';
	printf("current directory is:%s ",currendir);
	}
	else
	{
	printf("pwd,recv is error! ");
	}
	}
	//back 返回上一级函数，相当于cd /;
	void ftp_back(int control_sockfd)
	{
	char sendline[1024],recvline[1024];
	int recvbytes,sendbytes;
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	strcat(sendline,"CDUP");
	strcat(sendline," ");
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf("cdup send is error ! ");
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(recvbytes<0)
	{
	printf("cdup recv is error ! ");
	}
	if(strncmp(recvline,"250",3)==0)
	{
	printf("请求的文件操作已经成功 ");
	}
	}
	//下载的实现函数
	int ftp_download(int control_sockfd)
	{
	int pasv_or_port;// 定义the ftp协议的两种不同工作mode
	int recvbytes,sendbytes;
	char sendline[1024],recvline[1024];
	struct sockaddr_in serv_addr;
	FILE *fd;
	int i,j;
	int data_sockfd;
	//type
	zeromery(recvline,1024);
	zeromery(sendline,1024);
	strcat(sendline,"TYPE ");
	strcat(sendline,"I");
	strcat(sendline," ");
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf(" type send is error! ");
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(strncmp(recvline,"200",3)==0)
	{
	printf("使用二进制传输数据 ");
	}
	else
	{
	printf("type recv is error! ");
	}
	if(npsupport==0)
	{
	//open the file
	int size;
	char localpathname[60];//预打开的文件路径字符串
	int flags;
	char pathname[60];
	unsigned int mode;
	//用户来选择pasv 或者是 port mode
	char selectdata_mode_tran[1024];
	zeromery(selectdata_mode_tran,1024);
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	pasv_or_port=0;//(默认是pasv模式)
	//pasv mode
	if(pasv_or_port==0)
	{
	strcat(sendline,"PASV");
	strcat(sendline," ");
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf("pasv send is error! ");
	}
	zeromery(recvline,1024);
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(recvbytes<0)
	{
	printf("pasv recv is error! ");
	}
	if(strncmp(recvline,"227",3)==0)
	{
	char buf[55];
	snprintf(buf,51,">>> %s ",recvline);
	printf("%s ",buf);
	}
	else
	{
	printf("pasv recv is error! ");
	}
	//处理ftp server 端口
	char *ptr1,*ptr2;
	char num[1024];
	zeromery(num,1024);
	//取低位字节
	ptr1=recvline+strlen(recvline);
	while(*(ptr1)!=')')
	{
	ptr1--;
	}
	ptr2=ptr1;
	while(*(ptr2)!=',')
	ptr2--;
	strncpy(num,ptr2+1,ptr1-ptr2-1);
	i=atoi(num);//将字符串转换成整数
	//取高位字节
	zeromery(num,1024);
	ptr1=ptr2;
	ptr2--;
	while(*(ptr2)!=',')
	ptr2--;
	strncpy(num,ptr2+1,ptr1-ptr2-1);
	j=atoi(num);
	//初始化服务器数据连接时的端口信息
	int data_serviceport;
	data_serviceport=j*256+i;
	data_sockfd=socket(AF_INET,SOCK_STREAM,0);
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_addr.s_addr=INADDR_ANY;
	serv_addr.sin_port=htons(data_serviceport);
	if(connect(data_sockfd,(struct sockaddr*)&serv_addr,sizeof(struct sockaddr))==-1)
	{
	printf("pasv data connect is error! ");
	}
	printf("remote-file-pathname=");
	scanf("%s",pathname);
	printf("local-file-pathname=");
	scanf("%s",localpathname);
	printf("local:%s remore:%s ",localpathname,pathname);
	fd=fopen(localpathname,"w+");
	if(fd==NULL)
	{
	printf("cannot open file ");
	exit(1);
	}
	//send the command retr;
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	strcat(sendline,"RETR ");
	strcat(sendline,pathname);
	strcat(sendline," ");
	printf("%s ",sendline);
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf("retr send is error! ");
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(recvbytes<0)
	{
	printf("retr recv is error! ");
	}
	if(strncmp(recvline,"400",3)>0)
	{
	printf("return is error! ");
	}
	}
	//begin to transpotr data
	sleep(1);
	int flag=0;
	char buffer[65536];
	recvdata:
	zeromery(buffer,1024);
	recvbytes=recv(data_sockfd,buffer,sizeof(buffer),0);
	if(recvbytes<0)
	{
	close(data_sockfd);
	goto end;
	}
	fwrite(buffer,1,recvbytes,fd);
	zeromery(recvline,1024);
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(flag==0)
	{
	if(strncmp(recvline,"226",3)!=0)
	{
	flag=1;
	goto recvdata;
	}
	}
	end:
	if(flag!=1)
	{
	zeromery(recvline,1024);
	shutdown(data_sockfd,SHUT_WR);
	close(data_sockfd);
	}
	close(data_sockfd);
	return 0;
	}
	}
	//up 函数
	int ftp_up(int control_sockfd, char* localpathname, char* pathname)
	{
	int pasv_or_port;// 定义the ftp协议的两种不同工作mode
	int recvbytes,sendbytes;
	char sendline[1024],recvline[1024];
	struct sockaddr_in serv_addr;
	FILE *fd;
	int i,j;
	int data_sockfd;
	//type
	zeromery(recvline,1024);
	zeromery(sendline,1024);
	strcat(sendline,"TYPE ");
	strcat(sendline,"I");
	strcat(sendline," ");
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf(" type send is error! ");
	//发送失败 返回-2 启用重连
	return -2 ;
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(strncmp(recvline,"200",3)==0)
	{
	printf("使用二进制传输数据 ");
	}
	else
	{
	printf("type recv is error! ");
	}
	if(npsupport==0)
	{
	//open the file
	int size;
	//char localpathname[60];//预打开的文件路径字符串
	int flags;
	//char pathname[60];
	unsigned int mode;
	//用户来选择pasv 或者是 port mode
	char selectdata_mode_tran[1024];
	zeromery(selectdata_mode_tran,1024);
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	pasv_or_port=0;//(默认是pasv模式)
	//pasv mode
	if(pasv_or_port==0)
	{
	strcat(sendline,"PASV");
	strcat(sendline," ");
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf("pasv send is error! ");
	return -2 ; //////////////////////////临时增加
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(recvbytes<0)
	{
	printf("pasv recv is error! ");
	return -2 ; //////////////////////////临时增加
	}
	if(strncmp(recvline,"227",3)==0)
	{
	char buf[55];
	snprintf(buf,51,">>> %s ",recvline);
	printf("%s ",buf);
	}
	else
	{
	printf("pasv recv is error! ");
	return -2 ; //////////////////////////临时增加
	}
	//处理ftp server 端口
	char *ptr1,*ptr2;
	char num[1024];
	zeromery(num,1024);
	//取低位字节
	ptr1=recvline+strlen(recvline);
	while(*(ptr1)!=')')
	{
	ptr1--;
	}
	ptr2=ptr1;
	while(*(ptr2)!=',')
	ptr2--;
	strncpy(num,ptr2+1,ptr1-ptr2-1);
	i=atoi(num);//将字符串转换成整数
	//取高位字节
	zeromery(num,1024);
	ptr1=ptr2;
	ptr2--;
	while(*(ptr2)!=',')
	ptr2--;
	strncpy(num,ptr2+1,ptr1-ptr2-1);
	j=atoi(num);
	//初始化服务器数据连接时的端口信息
	int data_serviceport;
	data_serviceport=j*256+i;
	data_sockfd=socket(AF_INET,SOCK_STREAM,0);
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_addr.s_addr=INADDR_ANY;
	serv_addr.sin_port=htons(data_serviceport);
	if(inet_pton(AF_INET, FTP_CONNECT_IP, &serv_addr.sin_addr) <= 0){
	printf("inet_pton error for %s ", FTP_CONNECT_IP);
	exit(0);
	}
	if(connect(data_sockfd,(struct sockaddr*)&serv_addr,sizeof(struct sockaddr))==-1)
	{
	printf("pasv data connect is error! ");
	}
	//printf("local-file-pathname=");
	//scanf("%s",pathname);
	//printf("remote-file-pathname=");
	//scanf("%s",localpathname);
	//printf("local:%s remore:%s ",localpathname,pathname);
	fd=fopen(pathname,"r");
	if(fd==NULL)
	{
	printf("cannot open file,请重新输入！ ");
	return -2 ;
	}
	//send the command retr;
	zeromery(sendline,1024);
	zeromery(recvline,1024);
	strcat(sendline,"STOR ");
	strcat(sendline,localpathname);
	strcat(sendline," ");
	printf("%s ",sendline);
	sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
	if(sendbytes<0)
	{
	printf("stor send is error! ");
	}
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(recvbytes<0)
	{
	printf("retr recv is error! ");
	}
	if(strncmp(recvline,"150",3)==0)
	{
	char buf[55];
	snprintf(buf,25,">>> %s ",recvline);
	printf("%s ",buf);
	}
	}
	while(!feof(fd))
	{
	char buffer[65536];
	zeromery(buffer,sizeof(buffer));
	int size;
	size=fread(buffer,1,sizeof(buffer),fd);
	if(ferror(fd))
	{
	printf("read file data is error! ");
	fclose(fd) ;
	return -2 ;
	}
	else
	{
	zeromery(sendline,1024);
	sendbytes=send(data_sockfd,buffer,size,0);
	printf("传输了 %d 个字节 ",sendbytes);
	//发送失败 返回-2 启用重连
	if(sendbytes<0)
	{
	fclose(fd) ;
	return -2 ;
	}
	}
	close(data_sockfd);
	recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
	if(strncmp(recvline,"226",3)==0)
	{
	printf("226 transfer complete");
	break;
	}
	}
	fclose(fd) ;
	return 0;
	}
	}