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