Date: Tue, 21 Sep 2010 07:43:56 +0000 (UTC) From: Brian Somers <brian@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r212955 - stable/8/sbin/dhclient Message-ID: <201009210743.o8L7huVn083694@svn.freebsd.org>
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Author: brian Date: Tue Sep 21 07:43:56 2010 New Revision: 212955 URL: http://svn.freebsd.org/changeset/base/212955 Log: MFC r212253: Document how to use dhclient-{enter,exit}-hooks. PR: 149351 Modified: stable/8/sbin/dhclient/dhclient-script.8 Directory Properties: stable/8/sbin/dhclient/ (props changed) Modified: stable/8/sbin/dhclient/dhclient-script.8 ============================================================================== --- stable/8/sbin/dhclient/dhclient-script.8 Tue Sep 21 07:03:53 2010 (r212954) +++ stable/8/sbin/dhclient/dhclient-script.8 Tue Sep 21 07:43:56 2010 (r212955) @@ -38,7 +38,7 @@ .\" .\" $FreeBSD$ .\" -.Dd January 1, 1997 +.Dd September 6, 2010 .Dt DHCLIENT-SCRIPT 8 .Os .Sh NAME @@ -218,6 +218,29 @@ if it has reason to believe they are val If not, it should exit with a nonzero value. .El .Pp +Before taking action according to +.Va $reason , +.Nm +will check for the existence of +.Pa /etc/dhclient-enter-hooks . +If found, it will be sourced +.Pq see Xr sh 1 . +After taking action according to +.Va $reason , +.Nm +will check for the existence of +.Pa /etc/dhclient-exit-hooks . +If found, it will be sourced +.Pq see Xr sh 1 . +These hooks scripts can be used to dynamically modify the enviornment at +appropriate times during the DHCP negotiations. +For example, if the administrator wishes to disable alias IP numbers on +the DHCP interface, they might want to put the following in +.Pa /etc/dhclient-enter-hooks : +.Bd -literal -offset indent +[ ."$reason" = .PREINIT ] && ifconfig $interface 0.0.0.0 +.Ed +.Pp The usual way to test a lease is to set up the network as with .Li REBIND (since this may be called to test more than one lease) and then ping @@ -239,6 +262,7 @@ but current scripts do not do this. .\" and bear the names of the operating systems on which they are intended .\" to work. .Sh SEE ALSO +.Xr sh 1 , .Xr dhclient.conf 5 , .Xr dhclient.leases 5 , .Xr dhclient 8 ,
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