1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)fingerd.8 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/libexec/fingerd/fingerd.8,v 1.4.2.3 2001/08/16 10:44:15 ru Exp $ 34.\" $DragonFly: src/libexec/fingerd/fingerd.8,v 1.4 2006/04/08 08:17:07 swildner Exp $ 35.\" 36.Dd June 4, 1993 37.Dt FINGERD 8 38.Os 39.Sh NAME 40.Nm fingerd 41.Nd remote user information server 42.Sh SYNOPSIS 43.Nm 44.Op Fl s 45.Op Fl l 46.Op Fl p Ar filename 47.Sh DESCRIPTION 48.Nm Fingerd 49is a simple protocol based on 50.%T RFC1196 51that provides an interface to the 52Name and Finger programs at several network sites. 53The program is supposed to return a friendly, 54human-oriented status report on either the system at the moment 55or a particular person in depth. 56There is no required format and the 57protocol consists mostly of specifying a single 58.Dq command line . 59.Pp 60.Nm Fingerd 61is started by 62.Xr inetd 8 , 63which listens for 64.Tn TCP 65requests at port 79. 66Once connected it reads a single command line 67terminated by a 68.Aq Tn CRLF 69which is passed to 70.Xr finger 1 . 71.Nm Fingerd 72closes its connections as soon as the output is finished. 73.Pp 74If the line is null (i.e. just a 75.Aq Tn CRLF 76is sent) then 77.Xr finger 1 78returns a 79.Dq default 80report that lists all people logged into 81the system at that moment. 82.Pp 83If a user name is specified (e.g.\& 84.Pf eric Aq Tn CRLF ) 85then the 86response lists more extended information for only that particular user, 87whether logged in or not. 88Allowable 89.Dq names 90in the command line include both 91.Dq login names 92and 93.Dq user names . 94If a name is ambiguous, all possible derivations are returned. 95.Pp 96The following options may be passed to 97.Nm 98as server program arguments in 99.Pa /etc/inetd.conf : 100.Bl -tag -width indent 101.It Fl s 102Enable secure mode. 103Queries without a user name are rejected and 104forwarding of queries to other remote hosts is denied. 105.It Fl l 106Enable logging. 107The name of the host originating the query is reported via 108.Xr syslog 3 109at LOG_NOTICE priority. 110.It Fl p 111Use an alternate program as the local information provider. 112The default local program 113executed by 114.Nm 115is 116.Xr finger 1 . 117By specifying a customized local server, 118this option allows a system manager 119to have more control over what information is 120provided to remote sites. 121.El 122.Sh SEE ALSO 123.Xr finger 1 , 124.Xr inetd 8 125.Sh HISTORY 126The 127.Nm 128command appeared in 129.Bx 4.3 . 130.Sh BUGS 131Connecting directly to the server from a 132.Tn TIP 133or an equally narrow-minded 134.Tn TELNET Ns \-protocol 135user program can result 136in meaningless attempts at option negotiation being sent to the 137server, which will foul up the command line interpretation. 138.Nm Fingerd 139should be taught to filter out 140.Tn IAC Ns \'s 141and perhaps even respond 142negatively 143.Pq Tn IAC WON'T 144to all option commands received. 145