[Sysadmins] proftpd

[Alexey I. Froloff]

* Anton Gorlov <stalker@> [070306 13:52]:
> Встречал кто-нибудь в природе патч для proftpd который
> излечивает такой глюк, как сьедание такого сочетания как
> я+пробел?
Клиентов надо патчить.

RFC 0959:

      control connection

         The communication path between the USER-PI and SERVER-PI for
         the exchange of commands and replies.  This connection follows
         the Telnet Protocol.

RFC 0854:

TELNET COMMAND STRUCTURE

   All TELNET commands consist of at least a two byte sequence:  the
   "Interpret as Command" (IAC) escape character followed by the code
   for the command.  The commands dealing with option negotiation are
   three byte sequences, the third byte being the code for the option
   referenced.  This format was chosen so that as more comprehensive use
   of the "data space" is made -- by negotiations from the basic NVT, of
   course -- collisions of data bytes with reserved command values will
   be minimized, all such collisions requiring the inconvenience, and
   inefficiency, of "escaping" the data bytes into the stream.  With the
   current set-up, only the IAC need be doubled to be sent as data, and
   the other 255 codes may be passed transparently.
...
      IAC                 255    Data Byte 255.

-- 
Regards, Alexey I. Froloff
AIF5-RIPN, AIF5-RIPE
-------------------------------------------
  Inform-Mobil, Ltd. System Administrator
       http://www.inform-mobil.ru/
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