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Annotation of 43BSDTahoe/man/man8/telnetd.8, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1983 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)telnetd.8c  6.3 (Berkeley) 5/28/86
                      6: .\"
                      7: .TH TELNETD 8C "May 28, 1986"
                      8: .UC 5
                      9: .SH NAME
                     10: telnetd \- DARPA TELNET protocol server
                     11: .SH SYNOPSIS
                     12: .B /etc/telnetd
                     13: .SH DESCRIPTION
                     14: .I Telnetd
                     15: is a server which supports the DARPA standard
                     16: .B TELNET
                     17: virtual terminal protocol.
                     18: .I Telnetd
                     19: is invoked by the internet server (see
                     20: .IR inetd (8)),
                     21: normally for requests to connect to the
                     22: .B TELNET
                     23: port as indicated by the
                     24: .I /etc/services
                     25: file (see
                     26: .IR services (5)).
                     27: .PP
                     28: .I Telnetd
                     29: operates by allocating a pseudo-terminal device (see
                     30: .IR pty (4))
                     31: for a client, then creating a login process which has
                     32: the slave side of the pseudo-terminal as 
                     33: .BR stdin ,
                     34: .BR stdout ,
                     35: and
                     36: .BR stderr .
                     37: .I Telnetd
                     38: manipulates the master side of the pseudo-terminal,
                     39: implementing the
                     40: .B TELNET
                     41: protocol and passing characters
                     42: between the remote client and the login process.
                     43: .PP
                     44: When a
                     45: .B TELNET
                     46: session is started up, 
                     47: .I telnetd
                     48: sends
                     49: .B TELNET
                     50: options to the client side indicating
                     51: a willingness to do
                     52: .I remote echo
                     53: of characters, to
                     54: .I suppress go
                     55: .IR ahead ,
                     56: and to receive
                     57: .I terminal type information
                     58: from the remote client.
                     59: If the remote client is willing, the remote terminal type is
                     60: propagated in the environment of the created login process.
                     61: The pseudo-terminal allocated to the client is configured
                     62: to operate in \*(lqcooked\*(rq mode, and with XTABS and CRMOD
                     63: enabled (see
                     64: .IR tty (4)).
                     65: .PP
                     66: .I Telnetd
                     67: is willing to
                     68: .IR do :
                     69: .IR echo ,
                     70: .IR binary ,
                     71: .I suppress go
                     72: .IR ahead ,
                     73: and
                     74: .I timing
                     75: .IR mark .
                     76: .I Telnetd
                     77: is willing to have the remote client
                     78: .IR do :
                     79: .IR binary ,
                     80: .I terminal
                     81: .IR type ,
                     82: and
                     83: .I suppress go
                     84: .IR ahead .
                     85: .SH "SEE ALSO"
                     86: telnet(1C)
                     87: .SH BUGS
                     88: Some
                     89: .B TELNET
                     90: commands are only partially implemented.
                     91: .PP
                     92: The
                     93: .B TELNET
                     94: protocol allows for
                     95: the exchange of the number of lines and columns on the user's terminal,
                     96: but
                     97: .I telnetd
                     98: doesn't make use of them.
                     99: .PP
                    100: Because of bugs in the original 4.2 BSD
                    101: .IR telnet (1C),
                    102: .I telnetd
                    103: performs some dubious protocol exchanges to try to discover if the remote
                    104: client is, in fact, a 4.2 BSD
                    105: .IR telnet (1C).
                    106: .PP
                    107: .I Binary mode
                    108: has no common interpretation except between similar operating systems
                    109: (Unix in this case).
                    110: .PP
                    111: The terminal type name received from the remote client is converted to
                    112: lower case.
                    113: .PP
                    114: The
                    115: .I packet
                    116: interface to the pseudo-terminal
                    117: (see
                    118: .IR pty (4))
                    119: should be used for more
                    120: intelligent flushing of input and output queues.
                    121: .PP
                    122: .I Telnetd
                    123: never sends
                    124: .B TELNET
                    125: .I go ahead
                    126: commands.

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