# 2.11BSD#431 - /usr/man/cat8/telnetd.0

    TELNETD(8)	    UNIX Programmer's Manual	       TELNETD(8)

    NAME
         telnetd - DARPA TELNET protocol server

    SYNOPSIS
         /usr/libexec/telnetd

    DESCRIPTION
         Telnetd is a server which supports the DARPA standard TELNET
         virtual terminal protocol.  Telnetd is invoked by the inter-
         net server (see inetd(8)), normally for requests to connect
         to the TELNET port as indicated by the /etc/services file
         (see services(5)).

         Telnetd operates by allocating a pseudo-terminal device (see
         pty(4)) for a client, then creating a login process which
         has the slave side of the pseudo-terminal as stdin, stdout,
         and stderr.  Telnetd manipulates the master side of the
         pseudo-terminal, implementing the TELNET protocol and pass-
         ing characters between the remote client and the login pro-
         cess.

         When a TELNET session is started up, telnetd sends TELNET
         options to the client side indicating a willingness to do
         remote echo of characters, to suppress go ahead, and to
         receive terminal type information from the remote client.
         If the remote client is willing, the remote terminal type is
         propagated in the environment of the created login process.
         The pseudo-terminal allocated to the client is configured to
         operate in "cooked" mode, and with XTABS and CRMOD enabled
         (see tty(4)).

         Telnetd is willing to do: echo, binary, suppress go ahead,
         and timing mark.  Telnetd is willing to have the remote
         client do: binary, terminal type, and suppress go ahead.

    SEE ALSO
         telnet(1C)

    BUGS
         Some TELNET commands are only partially implemented.

         The TELNET protocol allows for the exchange of the number of
         lines and columns on the user's terminal, but telnetd
         doesn't make use of them.

         Because of bugs in the original 4.2 BSD telnet(1C), telnetd
         performs some dubious protocol exchanges to try to discover
         if the remote client is, in fact, a 4.2 BSD telnet(1C).

         Binary mode has no common interpretation except between
         similar operating systems (Unix in this case).

    Printed 11/24/99	November 16, 1996			1

    TELNETD(8)	    UNIX Programmer's Manual	       TELNETD(8)

         The terminal type name received from the remote client is
         converted to lower case.

         The packet interface to the pseudo-terminal (see pty(4))
         should be used for more intelligent flushing of input and
         output queues.

         Telnetd never sends TELNET go ahead commands.

    Printed 11/24/99	November 16, 1996			2

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