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161 lines
3.8 KiB
Groff
161 lines
3.8 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993 The Regents of the University of
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.\" 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: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution. Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 9, 2012
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.Dt RARPD 8
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.Os
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.Sh NAME
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.Nm rarpd
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.Nd reverse ARP daemon
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.Sh SYNOPSIS
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.Nm
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.Fl a
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.Op Fl dfsv
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.Op Fl t Ar directory
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.Op Fl P Ar pidfile
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.Nm
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.Op Fl dfsv
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.Op Fl t Ar directory
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.Op Fl P Ar pidfile
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.Ar interface
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.Sh DESCRIPTION
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The
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.Nm
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utility services Reverse ARP requests on the Ethernet connected to
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.Ar interface .
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Upon receiving a request,
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.Nm
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maps the target hardware address to an IP address via its name, which
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must be present in both the
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.Xr ethers 5
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and
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.Xr hosts 5
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databases.
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If a host does not exist in both databases, the translation cannot
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proceed and a reply will not be sent.
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.Pp
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By default, a request is honored only if the server
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(i.e., the host that
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.Nm
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is running on)
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can "boot" the target; that is, a file or directory matching the glob
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.Pa /tftpboot/\fIipaddr\fP*
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exists, where
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.Em ipaddr
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is the target IP address in hex.
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For example, the IP address 204.216.27.18 will be replied to if any of
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.Pa /tftpboot/CCD81B12 ,
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.Pa /tftpboot/CCD81B12.SUN3 ,
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or
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.Pa /tftpboot/CCD81B12-boot
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exist.
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This requirement can be overridden with the
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.Fl s
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flag (see below).
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.Pp
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In normal operation,
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.Nm
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forks a copy of itself and runs in the background.
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Anomalies and errors are reported via
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.Xr syslog 3 .
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl a
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Listen on all the Ethernets attached to the system.
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If
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.Fl a
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is omitted, an interface must be specified.
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.It Fl d
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If
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.Fl f
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is also specified,
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.Nm
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logs messages to
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.Em stdout
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and
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.Em stderr
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instead of via
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.Xr syslog 3 .
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.It Fl f
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Run in the foreground.
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.It Fl P
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Specify the pathname of the PID file.
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If not specified,
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.Pa /var/run/rarpd.pid
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or
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.Pa /var/run/rarpd.ifname.pid
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will be used depending on the
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.Fl a
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flag or the specified interface name.
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.It Fl s
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Supply a response to any RARP request for which an ethernet to IP address
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mapping exists; do not depend on the existence of
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.Pa /tftpboot/\fIipaddr\fP* .
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.It Fl t
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Supply an alternate tftp root directory to
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.Pa /tftpboot ,
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similar to the
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.Fl s
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option of
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.Xr tftpd 8 .
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This permits
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.Nm
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to selectively respond to RARP requests, but use an alternate directory
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for IP checking.
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.It Fl v
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Enable verbose syslogging.
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.El
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.Sh FILES
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.Bl -tag -width /etc/ethers -compact
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.It Pa /etc/ethers
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.It Pa /etc/hosts
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.It Pa /tftpboot
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.It Pa /var/run/rarpd.pid
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.El
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.Sh SEE ALSO
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.Xr bpf 4
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.Rs
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.%A "Finlayson, R."
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.%A "Mann, T."
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.%A "Mogul, J.C."
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.%A "Theimer, M."
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.%T "RFC 903: Reverse Address Resolution Protocol"
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.%D "June 1984"
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.%O "4 p"
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.Re
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.Sh AUTHORS
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.An -nosplit
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.An Craig Leres Aq Mt leres@ee.lbl.gov
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and
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.An Steven McCanne Aq Mt mccanne@ee.lbl.gov .
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Lawrence Berkeley Laboratory, University of California, Berkeley, CA.
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.Sh BUGS
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The
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.Nm
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utility can depend on the DNS to resolve the name discovered from
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.Pa /etc/ethers .
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If this name is not in the DNS but is in
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.Pa /etc/hosts ,
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the DNS lookup can cause a delayed RARP response, so in this situation
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it is recommended to configure
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.Xr nsswitch.conf 5
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to read
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.Pa /etc/hosts
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first.
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