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-.\" Copyright (c) 1983, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	@(#)telnetd.8	8.2 (Berkeley) 2/3/94
-.\" "
-.TH TELNETD 8
-.SH NAME
-telnetd \-
-.SM DARPA TELNET
-protocol server
-.SH SYNOPSIS
-.B /usr/libexec/telnetd
-[\fB\-a\fP \fIauthmode\fP] [\fB\-B\fP] [\fB\-D\fP] [\fIdebugmode\fP]
-[\fB\-e\fP] [\fB\-h\fP] [\fB\-I\fP\fIinitid\fP] [\fB\-l\fP]
-[\fB\-k\fP] [\fB\-n\fP] [\fB\-r\fP\fIlowpty-highpty\fP] [\fB\-s\fP]
-[\fB\-S\fP \fItos\fP] [\fB\-U\fP] [\fB\-X\fP \fIauthtype\fP]
-[\fB\-w\fP [\fBip\fP|\fImaxhostlen\fP[\fB,\fP[\fBno\fP]\fBstriplocal\fP]]]
-[\fB\-debug\fP [\fIport\fP]]
-.SH DESCRIPTION
-The
-.B telnetd
-command is a server which supports the
-.SM DARPA
-standard
-.SM TELNET
-virtual terminal protocol.
-.B Telnetd
-is normally invoked by the internet server (see
-.BR inetd (8)
-for requests to connect to the
-.SM TELNET
-port as indicated by the
-.I /etc/services
-file (see
-.BR services (5)).
-The
-.B \-debug
-option may be used to start up
-.B telnetd
-manually, instead of through
-.IR inetd (8).
-If started up this way, 
-.I port
-may be specified to run
-.B telnetd
-on an alternate
-.SM TCP
-port number.
-.PP
-The
-.B telnetd
-command accepts the following options:
-.TP
-\fB\-a\fP \fIauthmode\fP
-This option may be used for specifying what mode should be used for
-authentication.  Note that this option is only useful if
-.B telnetd
-has been compiled with support for the
-.SM AUTHENTICATION
-option.  There are several valid values for
-.IR authmode :
-.RS
-.TP
-.B debug
-Turns on authentication debugging code.
-.TP
-.B valid
-Only allow connections when the remote user can provide valid
-authentication information to identify the remote user, and is allowed
-access to the specified account without providing a password.
-.TP
-.B user
-Only allow connections when the remote user can provide valid
-authentication information to identify the remote user.  The
-.IR login (1)
-command will provide any additional user verification needed if the
-remote user is not allowed automatic access to the specified account.
-.TP
-.B other
-Only allow connections that supply some authentication information.
-This option is currently not supported by any of the existing
-authentication mechanisms, and is thus the same as specifying
-.B \-a
-.BR valid .
-.TP
-.B none
-This is the default state.  Authentication information is not required.
-If no or insufficient authentication information is provided, then the
-.IR login (1)
-program will provide the necessary user verification.
-.TP
-.B off
-This disables the authentication code.  All user verification will
-happen through the
-.IR login (1)
-program.
-.RE
-.TP
-.B \-B
-Specifies bftp server mode.  In this mode,
-.B telnetd
-causes login to start a
-.IR bftp (1)
-session rather than the user's normal shell.  In bftp daemon mode,
-normal logins are not supported, and it must be used on a port other
-than the normal
-.SM TELNET
-port.
-.TP
-\fB\-D\fP \fIdebugmode\fP
-This option may be used for debugging purposes.  This allows
-.B telnetd
-to print out debugging information to the connection, allowing the user
-to see what
-.B telnetd
-is doing.  There are several possible values for
-.IR debugmode :
-.RS
-.TP
-.B options
-Prints information about the negotiation of
-.SM TELNET
-options.
-.TP
-.B report
-Prints the
-.B options
-information, plus some additional information about what processing is
-going on.
-.TP
-.B netdata
-Displays the data stream received by
-.B telnetd.
-.TP
-.B ptydata
-Displays data written to the pty.
-.TP
-.B encrypt
-Enables	encryption debugging code.
-.TP
-.B exercise
-Has not been implemented yet.
-.RE
-.TP
-.B \-debug
-Enables debugging on each socket created by
-.B telnetd
-(see
-.SM SO_DEBUG
-in
-.IR socket (2)).
-.TP
-.B \-e
-This option causes
-.B telnetd
-to refuse unencrypted connections.
-.TP
-.B \-h
-Disables the printing of host-specific information before login has been
-completed.
-.TP
-\fB\-I\fP \fIinitid\fP
-This option is only applicable to
-.SM UNICOS
-systems prior to 7.0.  It specifies the
-.SM ID
-from
-.I /etc/inittab
-to use when init starts login sessions.  The default
-.SM ID
-is fe.
-.TP
-.B \-k
-This option is only useful if
-.B telnetd
-has been compiled with both linemode and kludge linemode support.  If
-the
-.B \-k
-option is specified, then if the remote client does not support the
-.SM LINEMODE
-option, then
-.B telnetd
-will operate in character at a time mode.  It will still support kludge
-linemode, but will only go into kludge linemode if the remote client
-requests it.  (This is done by by the client sending
-.SM DONT SUPPRESS-GO-AHEAD
-and
-.SM DONT ECHO.)
-The
-.B \-k
-option is most useful when there are remote clients that do not support
-kludge linemode, but pass the heuristic (if they respond with
-.SM WILL TIMING-MARK
-in response to a
-.SM DO TIMING-MARK)
-for kludge linemode support.
-.TP
-.B \-l
-Specifies line mode.  Tries to force clients to use line-at-a-time
-mode.  If the
-.SM LINEMODE
-option is not supported, it will go into kludge linemode.
-.TP
-.B \-n
-Disable
-.SM TCP
-keep-alives.  Normally
-.B telnetd
-enables the
-.SM TCP
-keep-alive mechanism to probe connections that have been idle for some
-period of time to determine if the client is still there, so that idle
-connections from machines that have crashed or can no longer be reached
-may be cleaned up.
-.TP
-\fB\-r\fP \fIlowpty-highpty\fP
-This option is only enabled when
-.B telnetd
-is compiled for
-.SM UNICOS.
-It specifies an inclusive range of pseudo-terminal devices to use.  If
-the system has sysconf variable
-.SM _SC_CRAY_NPTY
-configured, the default pty search range is 0 to
-.SM _SC_CRAY_NPTY;
-otherwise, the default range is 0 to 128.  Either
-.I lowpty
-or
-.I highpty
-may be omitted to allow changing either end of the search range.  If
-.I lowpty
-is omitted, the - character is still required so that
-.B telnetd
-can differentiate
-.I highpty
-from
-.IR lowpty .
-.TP
-.B \-s
-This option is only enabled if
-.B telnetd
-is compiled with support for SecurID cards.  It causes the
-.B \-s
-option to be passed on to
-.IR login (1),
-and thus is only useful if
-.IR login (1)
-supports the
-.B \-s
-flag to indicate that only SecurID validated logins are allowed, and is
-usually useful for controlling remote logins from outside of a firewall.
-.TP
-\fB\-S\fP \fItos\fP
-.TP
-.B \-U
-This option causes
-.B telnetd
-to refuse connections from addresses that cannot be mapped back into a
-symbolic name via the
-.IR gethostbyaddr (3)
-routine.
-.TP
-.B \-w \fP[\fBip\fP|\fImaxhostlen\fP[\fB,\fP[\fBno\fP]\fBstriplocal\fP]]
-Controls the form of the remote hostname passed to login(1).
-Specifying \fBip\fP results in the numeric IP address always being
-passed to login(1).  Specifying a number, \fImaxhostlen\fP, sets the
-maximum length of the hostname passed to login(1) before it will be
-passed as a numeric IP address.  If \fImaxhostlen\fP is 0, then the
-system default, as determined by the utmp or utmpx structures, is
-used.  The \fBnostriplocal\fP and \fBstriplocal\fP options, which must
-be preceded by a comma, control whether or not the local host domain
-is stripped from the remote hostname.  By default, the equivalent of
-\fBstriplocal\fP is in effect.
-.TP
-\fB\-X\fP \fIauthtype\fP
-This option is only valid if
-.B telnetd
-has been built with support for the authentication option.  It disables
-the use of
-.I authtype
-authentication, and can be used to temporarily disable a specific
-authentication type without having to recompile
-.BR telnetd .
-.PP
-.B Telnetd
-operates by allocating a pseudo-terminal device (see
-.IR pty (4))
-for a client, then creating a login process which has the slave side of
-the pseudo-terminal as
-.IR stdin ,
-.I stdout
-and
-.IR stderr .
-.B Telnetd
-manipulates the master side of the pseudo-terminal, implementing the
-.SM TELNET
-protocol and passing characters between the remote client and the login
-process.
-.PP
-When a
-.SM TELNET
-session is started up, 
-.B telnetd
-sends
-.SM TELNET
-options to the client side indicating a willingness to do the following
-.SM TELNET
-options, which are described in more detail below:
-.sp
-.nf
-.in +0.5i
-DO AUTHENTICATION
-WILL ENCRYPT
-DO TERMINAL TYPE
-DO TSPEED
-DO XDISPLOC
-DO NEW-ENVIRON
-DO ENVIRON
-WILL SUPPRESS GO AHEAD
-DO ECHO
-DO LINEMODE
-DO NAWS
-WILL STATUS
-DO LFLOW
-DO TIMING-MARK
-.in 
-.fi
-.PP
-The pseudo-terminal allocated to the client is configured
-to operate in \*(lqcooked\*(rq mode, and with
-.SM XTABS
-and
-.SM CRMOD
-enabled (see
-.IR tty (4)).
-.PP
-.B Telnetd
-has support for enabling locally the following
-.SM TELNET
-options:
-.TP "\w'.SM WILL TIMING-MARK\ 'u"
-.SM WILL ECHO
-When the
-.SM LINEMODE
-option is enabled, a
-.SM WILL ECHO
-or
-.SM WONT ECHO
-will be sent to the client to indicate the current state of terminal
-echoing.  When terminal echo is not desired, a
-.SM WILL ECHO
-is sent to indicate that
-.B telnetd
-will take care of echoing any data that needs to be echoed to the
-terminal, and then nothing is echoed.  When terminal echo is desired, a
-.SM WONT ECHO
-is sent to indicate that
-.B telnetd
-will not be doing any terminal echoing, so the
-client should do any terminal echoing that is needed.
-.TP
-.SM WILL BINARY
-Indicates that the client is willing to send a 8 bits of data, rather
-than the normal 7 bits of the Network Virtual Terminal.
-.TP
-.SM WILL SGA
-Indicates that it will not be sending
-.SM IAC GA,
-go ahead, commands.
-.TP
-.SM WILL STATUS 
-Indicates a willingness to send the client, upon request, of the current
-status of all
-.SM TELNET
-options.
-.TP
-.SM WILL TIMING-MARK
-Whenever a
-.SM DO TIMING-MARK
-command is received, it is always responded to with a
-.SM WILL TIMING-MARK
-.TP
-.SM WILL LOGOUT
-When a
-.SM DO LOGOUT
-is received, a
-.SM WILL LOGOUT
-is sent in response, and the
-.SM TELNET
-session is shut down.
-.TP
-.SM WILL ENCRYPT
-Only sent if
-.B telnetd
-is compiled with support for data encryption, and indicates a
-willingness to decrypt the data stream.
-.PP
-.B Telnetd
-has support for enabling remotely the following
-.SM TELNET
-options:
-.TP "\w'.SM DO TERMINAL-SPEED\ 'u"
-.SM DO BINARY
-Sent to indicate that
-.B telnetd
-is willing to receive an 8 bit data stream.
-.TP
-.SM DO LFLOW
-Requests that the client handle flow control characters remotely.
-.TP
-.SM DO ECHO
-This is not really supported, but is sent to identify a 4.2BSD
-.IR telnet (1)
-client, which will improperly respond with
-.SM WILL ECHO.
-If a
-.SM WILL ECHO
-is received, a
-.SM DONT ECHO
-will be sent in response.
-.TP
-.SM DO TERMINAL-TYPE
-Indicates a desire to be able to request the name of the type of
-terminal that is attached to the client side of the connection.
-.TP
-.SM DO SGA
-Indicates that it does not need to receive
-.SM IAC GA,
-the go ahead command.
-.TP
-.SM DO NAWS
-Requests that the client inform the server when the window (display)
-size changes.
-.TP
-.SM DO TERMINAL-SPEED
-Indicates a desire to be able to request information about the speed of
-the serial line to which the client is attached.
-.TP
-.SM DO XDISPLOC
-Indicates a desire to be able to request the name of the X windows
-display that is associated with the telnet client.
-.TP
-.SM DO NEW-ENVIRON
-Indicates a desire to be able to request environment variable
-information, as described in RFC 1572.
-.TP
-.SM DO ENVIRON
-Indicates a desire to be able to request environment variable
-information, as described in RFC 1408.
-.TP
-.SM DO LINEMODE
-Only sent if
-.B telnetd
-is compiled with support for linemode, and requests that the client do
-line by line processing.
-.TP
-.SM DO TIMING-MARK
-Only sent if
-.B telnetd
-is compiled with support for both linemode and kludge linemode, and the
-client responded with
-.SM WONT LINEMODE.
-If the client responds with
-.SM WILL TM,
-the it is assumed that the client supports kludge linemode.  Note that
-the
-.B \-k
-option can be used to disable this.
-.TP
-.SM DO AUTHENTICATION
-Only sent if
-.B telnetd
-is compiled with support for authentication, and indicates a willingness
-to receive authentication information for automatic login.
-.TP
-.SM DO ENCRYPT
-Only sent if
-.B telnetd
-is compiled with support for data encryption, and indicates a
-willingness to decrypt the data stream.
-.SH FILES
-.I /etc/services
-.br
-.I /etc/inittab
-(UNICOS systems only)
-.br
-.I /etc/iptos
-(if supported)
-.br
-.I /usr/ucb/bftp
-(if supported)
-.SH "SEE ALSO"
-.IR telnet (1),
-.IR login (1),
-.IR bftp (1)
-(if supported)
-.SH STANDARDS
-.TP "\w'.B RFC-2000\ 'u"
-.B RFC-854
-TELNET PROTOCOL SPECIFICATION
-.sp -1
-.TP
-.B RFC-855
-TELNET OPTION SPECIFICATIONS
-.sp -1
-.TP
-.B RFC-856
-TELNET BINARY TRANSMISSION
-.sp -1
-.TP
-.B RFC-857
-TELNET ECHO OPTION
-.sp -1
-.TP
-.B RFC-858
-TELNET SUPPRESS GO AHEAD OPTION
-.sp -1
-.TP
-.B RFC-859
-TELNET STATUS OPTION
-.sp -1
-.TP
-.B RFC-860
-TELNET TIMING MARK OPTION
-.sp -1
-.TP
-.B RFC-861
-TELNET EXTENDED OPTIONS - LIST OPTION
-.sp -1
-.TP
-.B RFC-885
-TELNET END OF RECORD OPTION
-.sp -1
-.TP
-.B RFC-1073
-Telnet Window Size Option
-.sp -1
-.TP
-.B RFC-1079
-Telnet Terminal Speed Option
-.sp -1
-.TP
-.B RFC-1091
-Telnet Terminal-Type Option
-.sp -1
-.TP
-.B RFC-1096
-Telnet X Display Location Option
-.sp -1
-.TP
-.B RFC-1123
-Requirements for Internet Hosts -- Application and Support
-.sp -1
-.TP
-.B RFC-1184
-Telnet Linemode Option
-.sp -1
-.TP
-.B RFC-1372
-Telnet Remote Flow Control Option
-.sp -1
-.TP
-.B RFC-1416
-Telnet Authentication Option
-.sp -1
-.TP
-.B RFC-1411
-Telnet Authentication: Kerberos Version 4
-.sp -1
-.TP
-.B RFC-1412
-Telnet Authentication: SPX
-.sp -1
-.TP
-.B RFC-1571
-Telnet Environment Option Interoperability Issues
-.sp -1
-.TP
-.B RFC-1572
-Telnet Environment Option
-.SH BUGS
-Some
-.SM TELNET
-commands are only partially implemented.
-.PP
-Because of bugs in the original 4.2 BSD
-.IR telnet (1),
-.B telnetd
-performs some dubious protocol exchanges to try to discover if the
-remote client is, in fact, a 4.2 BSD
-.IR telnet (1).
-.PP
-Binary mode has no common interpretation except between similar
-operating systems (Unix in this case).
-.PP
-The terminal type name received from the remote client is converted to
-lower case.
-.PP
-.B Telnetd
-never sends
-.SM TELNET
-.SM IAC GA
-(go ahead) commands.