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# NOTE: here we use 'ip' wrapper, therefore a route will be actually deleted via /usr/sbin/ip or vtysh, according to the system state
if [[ $reason =~ (EXPIRE|FAIL|RELEASE|STOP) ]]; then
# delete dynamic nameservers from a configuration if lease was deleted
logmsg info "Deleting nameservers with tag \"dhcp-${interface}\" via vyos-hostsd-client"
vyos-hostsd-client --delete-name-servers --tag dhcp-${interface}
# try to delete default ip route
for router in $old_routers; do
logmsg info "Deleting default route: via $router dev ${interface}"
ip -4 route del default via $router dev ${interface}
done
# delete rfc3442 routes
if [ -n "$old_rfc3442_classless_static_routes" ]; then
set -- $old_rfc3442_classless_static_routes
while [ $# -gt 0 ]; do
net_length=$1
via_arg=''
case $net_length in
32|31|30|29|28|27|26|25)
if [ $# -lt 9 ]; then
return 1
fi
net_address="${2}.${3}.${4}.${5}"
gateway="${6}.${7}.${8}.${9}"
shift 9
;;
24|23|22|21|20|19|18|17)
if [ $# -lt 8 ]; then
return 1
fi
net_address="${2}.${3}.${4}.0"
gateway="${5}.${6}.${7}.${8}"
shift 8
;;
16|15|14|13|12|11|10|9)
if [ $# -lt 7 ]; then
return 1
fi
net_address="${2}.${3}.0.0"
gateway="${4}.${5}.${6}.${7}"
shift 7
;;
8|7|6|5|4|3|2|1)
if [ $# -lt 6 ]; then
return 1
fi
net_address="${2}.0.0.0"
gateway="${3}.${4}.${5}.${6}"
shift 6
;;
0) # default route
if [ $# -lt 5 ]; then
return 1
fi
net_address="0.0.0.0"
gateway="${2}.${3}.${4}.${5}"
shift 5
;;
*) # error
return 1
;;
esac
# take care of link-local routes
if [ "${gateway}" != '0.0.0.0' ]; then
via_arg="via ${gateway}"
fi
# delete route (ip detects host routes automatically)
ip -4 route del "${net_address}/${net_length}" \
${via_arg} dev "${interface}" >/dev/null 2>&1
done
fi
fi
if [[ $reason =~ (EXPIRE6|RELEASE6|STOP6) ]]; then
# delete dynamic nameservers from a configuration if lease was deleted
logmsg info "Deleting nameservers with tag \"dhcpv6-${interface}\" via vyos-hostsd-client"
vyos-hostsd-client --delete-name-servers --tag dhcpv6-${interface}
fi
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