Procesing files received via ftp

Sebastian Bello <>
Tue Aug 30 23:09:37 CEST 2005


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
> 




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