Posted by petersprc on 12/18/06 04:50

Hi,

The message you're seeing is an "Interpret As Command" sequence that
sets up various options and initiates certain commands on the telnet
connection. See RFC854 (Telnet Command Structure):

http://www.ietf.org/rfc/rfc0854.txt

For instance, 0xFF 0xFB 0x1F probably enables the NAWS option that
allows a client to convey window size to a telnet server:

http://www.ietf.org/rfc/rfc1073.txt

_mario.lat wrote:
> Hallo,
> I find a library very userfull form connect by telnet.
> Just a question:
>
> The library sends strange data: why? what is userfull for these data?
> I mean these:
>
>
> [...]
> $this->conn1=chr(0xFF).chr(0xFB).chr(0x1F).chr(0xFF).chr(0xFB).
> chr(0x20).chr(0xFF).chr(0xFB).chr(0x18).chr(0xFF).chr(0xFB).
> chr(0x27).chr(0xFF).chr(0xFD).chr(0x01).chr(0xFF).chr(0xFB).
> chr(0x03).chr(0xFF).chr(0xFD).chr(0x03).chr(0xFF).chr(0xFC).
> chr(0x23).chr(0xFF).chr(0xFC).chr(0x24).chr(0xFF).chr(0xFA).
> chr(0x1F).chr(0x00).chr(0x50).chr(0x00).chr(0x18).chr(0xFF).
> chr(0xF0).chr(0xFF).chr(0xFA).chr(0x20).chr(0x00).chr(0x33).
> chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0x2C).chr(0x33).
> chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0xFF).chr(0xF0).
> chr(0xFF).chr(0xFA).chr(0x27).chr(0x00).chr(0xFF).chr(0xF0).
> chr(0xFF).chr(0xFA).chr(0x18).chr(0x00).chr(0x58).chr(0x54).
> chr(0x45).chr(0x52).chr(0x4D).chr(0xFF).chr(0xF0);
> $this->conn2=chr(0xFF).chr(0xFC).chr(0x01).chr(0xFF).chr(0xFC).
> chr(0x22).chr(0xFF).chr(0xFE).chr(0x05).chr(0xFF).chr(0xFC).chr(0x21);
>
> [...]
> $this->fp=fsockopen($ip,23)
> fputs($this->fp,$this->conn1);
> fputs($this->fp,$this->conn2);
> [...]
>
>
> why to send $this->conn1 and $this->fp?
> What is userfull for?
>
> Thank you in advance for the time you'l spend for me!
> Mario.

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