153 lines
4.2 KiB
Groff
153 lines
4.2 KiB
Groff
.\" $NetBSD: portmap.8,v 1.10 2000/01/21 11:10:51 abs Exp $
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.\"
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.\" Copyright (c) 1987 Sun Microsystems
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.\" Copyright (c) 1990, 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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.\" from: @(#)portmap.8 8.1 (Berkeley) 6/6/93
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.\"
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.Dd June 6, 1993
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.Dt PORTMAP 8
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.Os
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.Sh NAME
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.Nm portmap
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.Nd
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.Tn RPC
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program number to
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.Tn DARPA
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port mapper
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.Sh SYNOPSIS
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.Nm
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.Op Fl dils
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.Sh DESCRIPTION
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.Nm
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is a server that converts
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.Tn RPC
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program numbers into
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.Tn DARPA
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protocol port numbers.
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It must be running in order to make
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.Tn RPC
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calls.
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.Pp
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When an
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.Tn RPC
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server is started, it will tell
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.Nm
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what port number it is listening to, and what
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.Tn RPC
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program numbers it is prepared to serve.
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When a client wishes to make an
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.Tn RPC
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call to a given program number,
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it will first contact
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.Nm
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on the server machine to determine
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the port number where
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.Tn RPC
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packets should be sent.
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.Pp
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.Nm
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must be started before any
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.Tn RPC
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servers are invoked.
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.Pp
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Normally
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.Nm
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forks and dissociates itself from the terminal
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like any other daemon.
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.Nm
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then logs errors using
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.Xr syslog 3 .
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.Pp
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.Nm
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uses
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.Xr libwrap
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style access control (the
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.Pa /etc/hosts.allow
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and
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.Pa /etc/hosts.deny
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files)
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to control access to the portmapper itself and control forwarding
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of requests. This prevents clients from using
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.Nm
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to circumvent host-based services in individual services.
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.Pp
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Available options:
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.Bl -tag -width Ds
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.It Fl d
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prevents
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.Nm
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from running as a daemon,
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and causes errors and debugging information
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to be printed to the standard error output.
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.It Fl i
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.Dq insecure
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mode. Allows calls to PMAPPROC_SET and PMAPPROC_UNSET from any host. Normally
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.Nm
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accepts these requests only from the loopback interface for security reasons.
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This change is necessary for programs that were compiled with earlier
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versions of the rpc library and do not make those requests using the
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loopback interface.
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.It Fl l
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Turns on libwrap connection logging.
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.It Fl s
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causes
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.Nm
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to change to the user daemon as soon as possible.
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This causes
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.Nm
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to use non-privileged ports for outgoing connections, preventing non-privileged
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clients from using
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.Nm
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to connect to services from a privileged port.
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.El
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.Sh SEE ALSO
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.Xr inetd.conf 5 ,
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.Xr rpcinfo 8 ,
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.Xr inetd 8 ,
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.Xr syslog 3 ,
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.Xr hosts_access 5 ,
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.Xr hosts_options 5
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.Sh BUGS
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If
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.Nm
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crashes, all servers must be restarted.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.3 .
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The security features documented herein derive from work by Wietse Venema
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at Eindhoven University of Technology, The Netherlands, and first appeared
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in
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.Nx 1.4 .
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