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182 lines
4.8 KiB
Groff
182 lines
4.8 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)fingerd.8 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd April 1, 2010
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.Dt FINGERD 8
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.Os
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.Sh NAME
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.Nm fingerd
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.Nd remote user information server
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.Sh SYNOPSIS
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.Nm
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.Op Fl d
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.Op Fl k
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.Op Fl s
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.Op Fl l
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.Op Fl p Ar filename
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.Sh DESCRIPTION
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The
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.Nm
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utility uses a simple protocol based on
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.%T RFC1196
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that provides an interface to
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.Xr finger 1
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at several network sites.
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It is supposed to return a friendly,
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human-oriented status report on either the system at the moment
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or a particular person in depth.
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There is no required format and the
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protocol consists mostly of specifying a single
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.Dq "command line" ,
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thus,
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.Nm
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can also be used to implement other protocols in conjunction with the
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.Fl p
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flag.
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.Pp
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The
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.Nm
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utility is started by
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.Xr inetd 8 ,
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which listens for
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.Tn TCP
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requests at port 79.
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Once connected it reads a single command line
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terminated by a
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.Aq Tn CRLF
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which is passed to
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.Xr finger 1 .
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The
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.Nm
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utility closes its connections as soon as the output is finished.
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.Pp
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If the line is null (i.e., just a
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.Aq Tn CRLF
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is sent) then
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.Xr finger 1
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returns a
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.Dq default
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report that lists all people logged into
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the system at that moment.
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.Pp
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If a user name is specified (e.g.\&
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.Pf eric Aq Tn CRLF )
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then the
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response lists more extended information for only that particular user,
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whether logged in or not.
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Allowable
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.Dq names
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in the command line include both
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.Dq login names
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and
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.Dq user names .
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If a name is ambiguous, all possible derivations are returned.
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.Pp
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The following options may be passed to
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.Nm
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as server program arguments in
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.Pa /etc/inetd.conf :
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.Bl -tag -width indent
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.It Fl d
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Enable debugging mode.
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In debugging mode,
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.Nm
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will not attempt any network-related operations on
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.Va stdin ,
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and it will print the full
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.Nm finger
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command line
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to
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.Va stderr
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before executing it.
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.It Fl k
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Suppress login information.
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See the description of the
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.Fl k
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option in
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.Xr finger 1
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for details.
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.It Fl s
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Enable secure mode.
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Queries without a user name are rejected and
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forwarding of queries to other remote hosts is denied.
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.It Fl l
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Enable logging.
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The name of the host originating the query is reported via
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.Xr syslog 3
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at LOG_NOTICE priority.
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.It Fl p
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Use an alternate program as the local information provider.
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The default local program
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executed by
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.Nm
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is
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.Xr finger 1 .
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By specifying a customized local server,
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this option allows a system manager
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to have more control over what information is
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provided to remote sites.
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If
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.Fl p
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is specified,
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.Nm
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will also set the environment variable
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.Ev FINGERD_REMOTE_HOST
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to the name of the host making the request.
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.El
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.Sh SEE ALSO
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.Xr finger 1 ,
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.Xr inetd 8
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Bx 4.3 .
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.Sh BUGS
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Connecting directly to the server from a
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.Tn TIP
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or an equally narrow-minded
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.Tn TELNET Ns \-protocol
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user program can result
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in meaningless attempts at option negotiation being sent to the
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server, which will foul up the command line interpretation.
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The
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.Nm
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utility should be taught to filter out
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.Tn IAC Ns \'s
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and perhaps even respond
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negatively
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.Pq Tn IAC WON'T
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to all option commands received.
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