158 lines
4.7 KiB
Groff
158 lines
4.7 KiB
Groff
.\" Copyright (c) 1980, 1991 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.
|
|
.\"
|
|
.\" from: @(#)fingerd.8 6.4 (Berkeley) 3/16/91
|
|
.\" $Id: fingerd.8,v 1.18 2000/07/30 23:56:57 dholland Exp $
|
|
.\"
|
|
.Dd August 29, 1996
|
|
.Dt FINGERD 8
|
|
.Os "Linux NetKit (0.17)"
|
|
.Sh NAME
|
|
.Nm fingerd
|
|
.Nd remote user information server
|
|
.Sh SYNOPSIS
|
|
.Nm fingerd
|
|
.Op Fl wulf
|
|
.Op Fl pL Ar path
|
|
.Op Fl t Ar timeout
|
|
.Sh DESCRIPTION
|
|
.Nm Fingerd
|
|
is a simple daemon based on
|
|
.%T RFC1196
|
|
that provides an interface to the
|
|
.Dq finger
|
|
program at most network sites.
|
|
The program is supposed to return a friendly,
|
|
human-oriented status report on either the system at the moment
|
|
or a particular person in depth.
|
|
.Pp
|
|
If the
|
|
.Fl w
|
|
option is given, remote users will get an additional
|
|
.Dq Welcome to ...
|
|
banner
|
|
which also shows some informations (e.g. uptime, operating system name and
|
|
release) about the system the
|
|
.Nm fingerd
|
|
is running on. Some sites may consider this a security risk as it
|
|
gives out information that may be useful to crackers.
|
|
.Pp
|
|
If the
|
|
.Fl u
|
|
option is given, requests of the form
|
|
.Dq finger @host
|
|
are rejected.
|
|
.Pp
|
|
If the
|
|
.Fl l
|
|
option is given, information about requests made is logged. This
|
|
option probably violates users' privacy and should not be used on
|
|
multiuser boxes.
|
|
.Pp
|
|
If the
|
|
.Fl f
|
|
option is given, finger forwarding (user@host1@host2) is allowed.
|
|
Useful behind firewalls, but probably not wise for security and
|
|
resource reasons.
|
|
.Pp
|
|
The
|
|
.Fl p
|
|
option allows specification of an alternate location for fingerd to find
|
|
the
|
|
.Dq finger
|
|
program. The
|
|
.Fl L
|
|
option is equivalent.
|
|
.Pp
|
|
The
|
|
.Fl t
|
|
option specifies the time to wait for a request before closing the
|
|
connection. A value of 0 waits forever. The default is 60 seconds.
|
|
.Pp
|
|
Options to fingerd should be specified in
|
|
.Pa /etc/inetd.conf .
|
|
.Pp
|
|
The finger protocol consists mostly of specifying command arguments.
|
|
The
|
|
.Xr inetd 8
|
|
.Dq super-server
|
|
runs
|
|
.Nm fingerd
|
|
for
|
|
.Tn TCP
|
|
requests received on port 79.
|
|
Once connected
|
|
.Nm fingerd
|
|
reads a single command line
|
|
terminated by a
|
|
.Aq Tn CRLF
|
|
which is passed to
|
|
.Xr finger 1 .
|
|
It closes its connections as soon as all output is finished.
|
|
.Pp
|
|
If the line is empty (i.e. just a
|
|
.Aq Tn CRLF
|
|
is sent) then
|
|
.Xr finger
|
|
returns a
|
|
.Dq default
|
|
report that lists all people logged into
|
|
the system at that moment. This feature is blocked by the
|
|
.Fl u
|
|
option.
|
|
.Pp
|
|
If a user name is specified (e.g.
|
|
.Pf eric Aq Tn CRLF )
|
|
then the
|
|
response lists more extended information for only that particular user,
|
|
whether logged in or not.
|
|
Allowable
|
|
.Dq names
|
|
in the command line include both
|
|
.Dq login names
|
|
and
|
|
.Dq user names .
|
|
If a name is ambiguous, all possible derivations are returned.
|
|
.Sh SEE ALSO
|
|
.Xr finger 1 ,
|
|
.Xr inetd 8
|
|
.Sh RESTRICTIONS
|
|
Connecting directly to the server from a
|
|
.Tn TIP
|
|
or an equally narrow-minded
|
|
.Tn TELNET Ns \-protocol
|
|
user program can result
|
|
in meaningless attempts at option negotiation being sent to the
|
|
server, which will foul up the command line interpretation.
|
|
.Sh HISTORY
|
|
The finger daemon appeared in
|
|
.Bx 4.3 .
|