177 lines
6.0 KiB
Groff
177 lines
6.0 KiB
Groff
.\" $NetBSD: ifwatchd.8,v 1.12 2002/04/16 07:28:09 wiz Exp $
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.\"
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.\" Copyright (c) 2001-2002 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Martin Husemann <martin@NetBSD.ORG>.
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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 NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 2, 2001
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.Os
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.Dt IFWATCHD 8
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.Sh NAME
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.Nm ifwatchd
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.Nd "watch for addresses added to or deleted from interfaces and call up/down-scripts for them"
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.Sh SYNOPSIS
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.Nm
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.Op Fl d Ar down-script
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.Op Fl h
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.Op Fl i
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.Op Fl u Ar up-script
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.Op Fl v
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.Ar ifname(s)
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.Sh DESCRIPTION
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.Nm
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is used to monitor dynamic interfaces (for example PPP interfaces) for address
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changes. Sometimes these interfaces are accompanied by a daemon program, which
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can take care of running any necessary scripts (like
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.Xr pppd 8
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or
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.Xr isdnd 8 ) ,
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but sometimes the interfaces run completely autonomously (like
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.Xr pppoe 8 ) .
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.Pp
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.Nm
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provides a generic way to watch this type of changes. It works by monitoring
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the routing socket and interpreting
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.Ql RTM_NEWADDR
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.Pq address added
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and
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.Ql RTM_DELADDR
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.Pq address deleted
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messages. It does not need special privileges to do this. The scripts called
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for up or down events are run with the same user id as
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.Nm
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is run.
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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 d Ar down-script
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Specify the command to invoke on
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.Dq interface down
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events (or: deletion of an address from an interface).
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.It Fl h
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Show the synopsis.
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.It Fl i
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Inhibit a call to the up-script on startup for all watched interfaces
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already marked up. If this option is not given,
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.Nm
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will check all watched interfaces on startup whether they are already marked
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up and, if they are, call the up-script with appropriate parameters.
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.Pp
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Since ifwatchd typically is started late in the system boot sequence, some
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of the monitored interfaces may already have come up when it finally starts,
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but their up-scripts have not been called. By default
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.Nm
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calls them on startup to account for this (and make the scripts easier.)
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.It Fl u Ar up-script
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Specify the command to invoke on
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.Dq interface up
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events (or: addition of an address to an interface).
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.It Fl v
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Output verbose progress messages and flag errors ignored during normal
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operation.
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.It Ar ifname(s)
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The name of the interface to watch. Multiple interfaces may be specified.
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Events for other interfaces are ignored.
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.El
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.Sh EXAMPLES
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.Bd -literal -offset indent
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# ifwatchd -u /etc/ppp/ip-up -d /etc/ppp/ip-down pppoe0
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.Ed
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If your pppoe0 interface is your main connection to the internet, the typical
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use of the up/down scripts is to add and remove a default route. This is
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an example for an up script doing this:
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.Bd -literal -offset indent
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#! /bin/sh
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/sbin/route add default $5
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.Ed
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As described below the fifth command line parameter will contain the peer
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address of the pppoe link. The corresponding ip-down script is:
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.Bd -literal -offset indent
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#! /bin/sh
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/sbin/route delete default $5
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.Ed
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Note that this is not a good idea if you have pppoe0 configured to connect
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only on demand (via the link1 flag), but works well for all permanent connected
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cases. Use
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.Bd -literal -offset indent
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! /sbin/route add default -iface 0.0.0.1
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.Ed
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in your
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.Pa /etc/ifconfig.pppoe0
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file in the on-demand case.
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.Sh PARAMETERS PASSED TO SCRIPTS
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The invoked scripts get passed these parameters:
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.Bl -tag -width destination
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.It Ar ifname
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The name of the interface this change is for (this allows to share the same
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script for multiple interfaces watched and dispatching on the interface name
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in the script).
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.It Ar tty
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Dummy parameter for compatibility with
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.Xr pppd 8
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which will always be
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.Em /dev/null .
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.It Ar speed
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Dummy parameter for compatibility with
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.Xr pppd 8
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which will always be
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.Em 9600 .
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.It Ar address
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The new address if this is an up event, or the no longer valid old address
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if this is a down event.
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.Pp
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The format of the address depends on the address family, for IPv4 it is the
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usual dotted quad notation, for IPv6 the colon separated standard notation.
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.It Ar destination
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For point to point interfaces, this is the remote address of the interface.
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For other interfaces it is the broadcast address.
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.El
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.Sh SEE ALSO
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.Xr route 4 ,
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.Xr ifconfig.if 5 ,
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.Xr pppoe 8 ,
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.Xr rc.d 8 ,
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.Xr route 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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.Nx 1.6 .
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.Sh AUTHORS
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The program was written by
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.An Martin Husemann Aq martin@netbsd.org .
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