如何在Linux下用C语言访问ftp服务器中的文件？

[bigyelloworange]

有一台ftp服务器，我需要在Linux下用C语言读取那个服务器中ftp的文件。总不至于让我编一个ftp客户端吧？有什么现成的ftp客户端的库文件可以用，或者谁能写出shell脚本反复调用系统带的ftp，每隔几分钟就自动把ftp server中的文件读到本地计算机？

[hundlom]

这种shell多的跟马一样。
--------------------------------
cd $PORTAL_WAP/$LogYear$LogMonth$LogDay
ftp -in $IP <<EOF
user $FTP_USER $FTP_PWD
binary
cd $REMOTE_DIR$LogYear$LogMonth$LogDay
ls -l
mget $LogYear$LogMonth$LogDay*_00.log
close
bye
EOF

[yyy790601]

以前写过，就是从一个ftp服务端下载一个叫net的文件，使用的是被动模式，下面是接口，希望对你有所帮助。


int ftpcmd(int sockftp,char *fmt,...) //cmd
{
va_list vp;
int err,len;
int i,j,n,p;

if (ftpio == NULL)
{
ftpio = fdopen(sockftp,"r"); //socket->file pointer
if (ftpio == NULL)
return -1;
}
if (fmt)
{
va_start(vp,fmt);
len = vsprintf(ftp_buf,fmt,vp);
ftp_buf[len++] = '\r';
ftp_buf[len++]='\n';
write(sockftp,ftp_buf,len); //buf->socket

}

n=read(sockftp,ftp_buffer,sizeof(ftp_buffer));
printf("the buff is %s\n",ftp_buffer);
if(fmt=="PASV") //被动模式下提取需要连接服务端的端口
{
ftp_buffer[n-3]='\0';
str1=ftp_buffer+39;
str2=strchr(str1,',');
i=atoi(str2+1);
n=0;
while(str1[n]!=',')
{
str3[n]=str1[n];
n++;
}
j=atoi(str3);
p=j*256+i;
return p;

}
return 1;
}

int ftp()
{
char *host="192.168.0.4";
char *user="yuan";
char *pass="123456";
char *filename="net";
char *savefile="net";
int sockftp = -1,sockdata = -1,sockxfer = -1;
struct sockaddr_in addr;
unsigned long hostip;
int len,tmp,err,err1;
int retval = -1;
int savefd;
char *del=":";
char *port;
struct hostent *he;
hostip = inet_addr(host); //ip

sockftp = socket(AF_INET,SOCK_STREAM,0); //control socket
if (sockftp == -1)
goto out;

addr.sin_family = PF_INET;
addr.sin_port = htons(21);
addr.sin_addr.s_addr = hostip;
if (connect(sockftp,(struct sockaddr *)&addr,sizeof(addr)) == -1) //wait for connect
goto out;

err = ftpcmd(sockftp,NULL); //connect ftp server
err = ftpcmd(sockftp,"USER %s",user);
err = ftpcmd(sockftp,"PASS %s",pass);
err = ftpcmd(sockftp,"TYPE I");
err1 = ftpcmd(sockftp,"PASV");

tmp = sizeof(addr);
sockdata = socket(AF_INET,SOCK_STREAM,0); //data socket
if (sockdata == -1)
goto out;
memset(&addr,0,tmp);
addr.sin_family = AF_INET;
addr.sin_port = htons(err1);
addr.sin_addr.s_addr = inet_addr(host);;
sockxfer = connect(sockdata,&addr,tmp);
if (sockxfer == -1)
goto out;
err=ftpcmd(sockftp,"RETR %s",filename);
/*savefd = open(savefile,O_RDWR | O_CREAT); //create file
if (savefd == -1)
goto out; */

len=read(sockdata,ftp_buf,sizeof(ftp_buf));
client_ip=strtok(ftp_buf,del);
port=strtok(NULL,del);
client_port=atoi(port);
printf("the cilentip is %s,the port is %d\n",client_ip,client_port);

/*write(savefd,ftp_buf,len);
close(savefd);*/

out:
close(sockxfer);
close(sockdata);
close(sockftp);
}

[诗魂鹤影]

^_^ 用 hundlom(托克维尔) 的脚本 加到crontab中自动定时执行 ^_^

[yjf7888]

shell