#!/bin/sh
#----------------------------------------------------------------------------
# /etc/ppp/prefix-down
# called whenever an IPv4 network prefix disappears
#
# Last Update:     $Id$
#----------------------------------------------------------------------------

# $1 = interface
# $2 = circuit name
# $3 = network prefix

. /etc/boot.d/forking.inc
. /etc/boot.d/locking.inc
. /etc/boot.d/networking.inc

script_name="prefix-down"
script="$script_name[$$]"
facility=$circuit_logfacility
logmsgprio=$facility.notice
. /usr/share/logfunc.sh

export PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin

interface=$1
circ_id=$2
prefix=$3

{
fork_call_handlers
sync_lock_resource prefixupdown-$circ_id "$script"

echo "$circ_id[$interface]: IPv4 prefix $prefix has disappeared"

circuit_deregister_prefix $circ_id ipv4 $prefix
setup-dynamic-iptables.sh

# Call all custom prefix-downs
for j in /etc/ppp/prefix-down[0-9][0-9][0-9].*
do
    if [ -f $j ]
    then
        echo "executing $j"
        . $j
    fi
done

curprefixes=$(circuit_get_prefixes $circ_id ipv4)
if [ -z "$curprefixes" ]
then
    # now the circuit is at most semionline
    circuit_go_offline_if_necessary $circ_id ipv4
fi

sync_unlock_resource prefixupdown-$circ_id "$script"
} 2>&1 | logmsg "$script" $logmsgprio