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1.1       root        1: .TH TELNETD 8C "4 March 1983"
                      2: .UC 4
                      3: .SH NAME
                      4: telnetd \- DARPA TELNET protocol server
                      5: .SH SYNOPSIS
                      6: .B /etc/telnetd
                      7: [
                      8: .B \-d
                      9: ] [
                     10: .I port
                     11: ]
                     12: .SH DESCRIPTION
                     13: .I Telnetd
                     14: is a server which supports the DARPA standard TELNET
                     15: virtual terminal protocol.  The TELNET server operates
                     16: at the port indicated in the ``telnet'' service description;
                     17: see
                     18: .IR services (5).
                     19: This port number may be overridden (for debugging purposes)
                     20: by specifying a port number on the command line.  If the
                     21: .B \-d
                     22: option is specified, each socket created by
                     23: .I telnetd
                     24: will have debugging enabled (see SO_DEBUG in
                     25: .IR socket (2)).
                     26: .PP
                     27: .I Telnetd
                     28: operates by allocating a pseudo-terminal device (see
                     29: .IR pty (4))
                     30: for a client, then creating a login process which has
                     31: the slave side of the pseudo-terminal as 
                     32: .BR stdin ,
                     33: .BR stdout ,
                     34: and
                     35: .BR stderr .
                     36: .I Telnetd
                     37: manipulates the master side of the pseudo terminal,
                     38: implementing the TELNET protocol and passing characters
                     39: between the client and login process.
                     40: .PP
                     41: When a TELNET session is started up, 
                     42: .I telnetd
                     43: sends a TELNET option to the client side indicating
                     44: a willingness to do ``remote echo'' of characters.
                     45: The pseudo terminal allocated to the client is configured
                     46: to operate in ``cooked'' mode, and with XTABS and CRMOD
                     47: enabled (see
                     48: .IR tty (4)).
                     49: Aside from this initial setup, the only mode changes
                     50: .I telnetd
                     51: will carry out are those required for echoing characters
                     52: at the client side of the connection.
                     53: .PP
                     54: .I Telnetd
                     55: supports binary mode, and most of the common TELNET options,
                     56: but does not, for instance, support timing marks.  Consult
                     57: the source code for an exact list of which options are not
                     58: implemented.
                     59: .SH "SEE ALSO"
                     60: telnet(1C)
                     61: .SH BUGS
                     62: .I Telnetd
                     63: supports at most 16 users. It uses these
                     64: pseudo-terminals
                     65: /dev/ptyp[0-9a-f].
                     66: .PP
                     67: A complete list of the options supported should be given here.

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