telnetd(8c) [ultrix man page]

telnetd(8c)															       telnetd(8c)

Name
       telnetd - DARPA TELNET protocol server

Syntax
       /etc/telnetd

Description
       The  server  supports the DARPA standard TELNET virtual terminal protocol.  The TELNET server is invoked when receives a connection request
       on the port indicated in the TELNET service description.

       The server operates by allocating a pseudo-terminal device for a client, then creating a login process which has  the  slave  side  of  the
       pseudo-terminal	as stdin, stdout, and stderr.  The server manipulates the master side of the pseudo terminal, implementing the TELNET pro-
       tocol and passing characters between the client and login process.

       When a TELNET session is started up, sends a TELNET option 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.

       Aside  from  this  initial  setup, the only mode changes will carry out are those required for echoing characters at the client side of the
       connection.

       The server supports binary mode, suppress go ahead, echo, and timing mark.  It also allows a remote client to do binary, terminal type, and
       suppress go ahead.

Restrictions
       Some TELNET commands are only partially implemented.

       The TELNET protocol allows the exchange of the number of lines and columns on the user's terminal, but does not make use of them.

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

       The server never sends TELNET go ahead commands.

See Also
       telnet(1c), pty(4), tty(4), services(5), inetd(8c)

																       telnetd(8c)

TELNETD(8)						      System Manager'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 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 indicating a willingness to do remote echo of  charac-
       ters,  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, ter-
       minal 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).

       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.

4.2 Berkeley Distribution					 November 16, 1996							TELNETD(8)