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BSD 2.11 - man page for telnetd (bsd section 8)

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TELNETD(8)									       TELNETD(8)

       telnetd - DARPA TELNET protocol server


       Telnetd	is  a  server which supports the DARPA standard TELNET virtual terminal protocol.
       Telnetd is invoked by the internet 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 passing characters between the remote client and the login process.

       When a TELNET session is started up, telnetd sends TELNET options to the client side indi-
       cating 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.


       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).

       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 intelli-
       gent flushing of input and output queues.

       Telnetd never sends TELNET go ahead commands.

4.2 Berkeley Distribution		November 16, 1996			       TELNETD(8)
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