Procesing files received via ftp

Serge Aleynikov <>
Tue Aug 30 23:26:16 CEST 2005


Correct.

Sebastian Bello wrote:
> Serge,
> 
> the rename is done by the client, right?
>     Sebastian-
> 
> ----- Original Message -----
> From: "Serge Aleynikov" <>
> To: "Sebastian Bello" <>
> Cc: <>
> Sent: Tuesday, August 30, 2005 5:53 PM
> Subject: Re: Procesing files received via ftp
> 
> 
> 
>>Sebastian Bello wrote:
>>
>>>Hi list,
>>>
>>>I need to process files received via ftp.
>>>I see two approaches:
>>>
>>>    1. poll the ftp directory
>>>    How can I make sure a file download has finished?
>>
>>We usually use the following method:
>>
>>a. Upload a file with a temp name
>>b. Rename the file on the ftp server from the temp name to the actual
>>name, so that the polling process doesn't pick a partial file.
>>
>>
>>>    2. use a specialized ftp server which triggers file processing after
>>>receipt.
>>>    I've been trying the Erlang ftpd implementation. File uploads seems
>>>not to work with a Windows client. And I'm not 100% sure they work fine
>>>with a Linux one. Has anybody used ftpd in a production environment?
>>
>>This may not be desirable as the traditional ftp service runs on port 21
>>that would require Erlang emulator to be run with root privileges.  This
>>would open a serious security hole (e.g. someone could easily trash the
>>host with rpc:call(Node, os, cmd, ["/bin/rm -fr /"]) ).
>>
>>3. Run the ftpd on some port > 1024.  Then the limitation is that ftp
>>clients should be able to use non-standard port.
>>
>>Serge
>>
>>--
>>Serge Aleynikov
>>R&D Telecom, IDT Corp.
>>Tel: (973) 438-3436
>>Fax: (973) 438-1464
>>
> 
> 
> 

-- 
Serge Aleynikov
R&D Telecom, IDT Corp.
Tel: (973) 438-3436
Fax: (973) 438-1464




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