Question

嘿，我是Ruby的新手，并试图通过将一些编程从一种语言移植到另一种语言来学习。现在我正在使用Ruby中的FTP模糊器来镜像这个perl脚本：

use Net::FTP;
$target = "192.168.37.128";
$buffer = "A\x20";
$buffer .= "A" x 512;
$ftp = Net::FTP->new($target, Debug => 0, Timeout => 5)
      or die "Cannot connect to $host: $@ \n";
$ftp->login("anonymous",'anonymous@nowhere.com')
      or die "Couldn't log in: $@\n";
$ftp->list($buffer);
$ftp->quit;

这是我的Ruby等价物：

require 'net/ftp'
buffer = 'A\x20'
buffer = (buffer + ('A'*512))
ftp = Net::FTP.open('127.0.0.1','anonymous','anonymous')
ftp.login
ftp.list(buffer)
ftp.quit

当我运行程序时，我收到以下错误：

C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:241:in `readline': end of file reached (EOF
Error)
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:241:in `getline'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:251:in `getmultiline'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:265:in `getresp'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:281:in `voidresp'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:304:in `block in voidcmd'
        from C:/Ruby192/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:302:in `voidcmd'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:155:in `send_type_command'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:149:in `binary='
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:168:in `ensure in with_binary'

        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:168:in `with_binary'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:440:in `block in retrlines'
        from C:/Ruby192/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:439:in `retrlines'
        from C:/Ruby192/lib/ruby/1.9.1/net/ftp.rb:682:in `list'
        from ftpcrash.rb:10:in `<main>'

我已经将问题追溯到ftp.list(buffer)行，但是无法提出一个Ruby解决方案来完成$ftp->list($buffer)在perl中所做的事情。

建议？

Answer 1

缓冲区是不必要的。 #list采用可选参数，如'* n'，而不是缓冲区，并返回一个数组。

require 'net/ftp'
ftp = Net::FTP.open('ftp.gnu.org','anonymous','')
puts ftp.list
ftp.quit

Answer 2

根据net/ftp.rb源代码判断，当ftp库试图从服务器获取响应并且响应为空时，会引发此异常。

您应该在begin/rescue/end（或只是rescue）中包装此命令并相应地处理错误。

Answer 3

这里你想要什么

#!/bin/ruby 

require 'socket'


buffer = "A" * 512

host = 'xx.xx.xx.xx'
port = 21
s = TCPSocket.open(host, port)
s.recv(1024)
s.send("USER anonymous\r\n", 0)
s.recv(1024)
s.send("PASS anonymous\r\n", 0)
s.recv(1024)
s.send(buffer + "\r\n", 0)
sleep 0.3
s.close

保持安全;）

使用Ruby模糊FTP服务器

3 个答案: