dhcp/if-up.d.dhcpd-restart-hook

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#! /bin/bash
#
# dhcpd-restart-hook - script to restart dhcpd on virtual interfaces
#
# Copyright (C) 2009 SUSE LINUX Products GmbH, Nuernberg, Germany.
#
# Author(s): Marius Tomaschewski <mt@suse.de>, 2009
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# version 2 as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>
#
# Please send feedback via http://www.suse.de/feedback
#
set -e
unset ${!LC_*} LANUGUAGE
export LANG=POSIX
export PATH=/sbin:/usr/sbin:/usr/bin:/bin
SCRIPTNAME=${0##*/}
usage () {
echo "usage: $SCRIPTNAME [<config>] <interface> [-o <options>]"
echo ""
echo "Any options are ignored"
exit $R_USAGE
}
R_INTERNAL=1 # internal error, e.g. no config or missing scripts
cd /etc/sysconfig/network || exit $R_INTERNAL
case $1 in ""|-h|*help*) usage ;; esac
INTERFACE="$1"
if test "x$2" != x -a "x$2" != "x-o" ; then
CONFIG=$INTERFACE
INTERFACE="$2"
shift
else
CONFIG=$INTERFACE
fi
shift
mode=""
args=$(getopt -o "o:" -- "$@")
eval set -- "$args"
while [ $# -gt 0 ]; do
case "$1" in
--) shift; break;;
-o) mode="$2"; shift;;
esac
shift
done
. /etc/sysconfig/network/config
if test -f /etc/sysconfig/network/scripts/functions ; then
. /etc/sysconfig/network/scripts/functions
fi
. /etc/sysconfig/dhcpd 2>/dev/null
. /etc/sysconfig/network/ifcfg-"$CONFIG" 2>/dev/null || true
: ${DHCPD_IFUP_RESTART:=auto}
: ${DHCPD6_IFUP_RESTART:=auto}
iface_needs_restart()
{
test -d /sys/class/net/$1/bridge -o \
-d /sys/class/net/$1/bonding -o \
-f /proc/net/vlan/$1
}
dhcpv4_server_restart()
{
#
# don't do anything if we are disabled either
# in the /etc/sysconfig/dhcpd or per interface
# in the /etc/sysconfig/network/ifcfg-"$CONFIG"
#
test "$DHCPD_IFUP_RESTART" = no && return 0
# don't restart for loopback interface
case $INTERFACE in (lo) return 0 ;; esac
restart_needed=$DHCPD_IFUP_RESTART
if test -n "$DHCPD_INTERFACE" \
-a "$restart_needed" != yes ;
then
for I in $DHCPD_INTERFACE ; do
test -n "$I" || continue
# don't restart when _one_ involved
# interface is not available/up yet
is_iface_up $I || return 0
# check if this interface is involved
if test "$I" = "$INTERFACE" ; then
# check if a restart is needed
if iface_needs_restart $I ; then
restart_needed=yes
fi
fi
done
fi
if test "$restart_needed" = yes ; then
if test "`/usr/bin/systemctl --value -p SubState show dhcpd.service`" = "running"; then
/usr/bin/systemctl restart dhcpd.service
fi
fi
}
dhcpv6_server_restart()
{
#
# don't do anything if we are disabled either
# in the /etc/sysconfig/dhcpd or per interface
# in the /etc/sysconfig/network/ifcfg-"$CONFIG"
#
test "$DHCPD6_IFUP_RESTART" = no && return 0
# don't restart for loopback interface
case $INTERFACE in (lo) return 0 ;; esac
restart_needed=$DHCPD6_IFUP_RESTART
if test -n "$DHCPD6_INTERFACE" \
-a "$restart_needed" != yes ;
then
for I in $DHCPD6_INTERFACE ; do
test -n "$I" || continue
# don't restart when _one_ involved
# interface is not available/up yet
is_iface_up $I || return 0
# check if this interface is involved
if test "$I" = "$INTERFACE" ; then
# check if a restart is needed
if iface_needs_restart $I ; then
restart_needed=yes
fi
fi
done
fi
if test "$restart_needed" = yes ; then
if test "`/usr/bin/systemctl --value -p SubState show dhcpd6.service`" = "running"; then
/usr/bin/systemctl restart dhcpd6.service
fi
fi
}
case "$mode" in
*-up*)
dhcpv4_server_restart
dhcpv6_server_restart
;;
*-down*)
# don't do anything
;;
*)
echo "$SCRIPTNAME: don't know what to do" >&2
;;
esac