1#!/bin/sh
2
3# Copyright (c) 2006 Simon Kelley
4#
5#  This program is free software; you can redistribute it and/or modify
6#  it under the terms of the GNU General Public License as published by
7#  the Free Software Foundation; version 2 dated June, 1991.
8#
9#  This program is distributed in the hope that it will be useful,
10#  but WITHOUT ANY WARRANTY; without even the implied warranty of
11#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12#  GNU General Public License for more details.
13
14
15# if $1 is add del or old, this is a dnsmasq-called lease-change
16# script, update the nvram database. if $1 is init, emit a 
17# dnsmasq-format lease file to stdout representing the current state of the 
18# database, this is called by dnsmasq at startup.
19
20NVRAM=/usr/sbin/nvram
21PREFIX=dnsmasq_lease_
22
23# Arguments.
24# $1 is action (add, del, old)
25# $2 is MAC 
26# $3 is address
27# $4 is hostname (optional, may be unset)
28
29# env.
30# DNSMASQ_LEASE_LENGTH or DNSMASQ_LEASE_EXPIRES (which depends on HAVE_BROKEN_RTC)
31# DNSMASQ_CLIENT_ID (optional, may be unset)
32
33# File.
34# length|expires MAC addr hostname|* CLID|* 
35
36# Primary key is address.
37
38if [ ${1} = init ] ; then
39     ${NVRAM} show | sed -n -e "/^${PREFIX}.*/ s/^.*=//p"
40else
41     if [ ${1} = del ] ; then
42          ${NVRAM} unset ${PREFIX}${3}
43     fi
44
45     if [ ${1} = old ] || [ ${1} = add ] ; then
46          ${NVRAM} set ${PREFIX}${3}="${DNSMASQ_LEASE_LENGTH:-}${DNSMASQ_LEASE_EXPIRES:-} ${2} ${3} ${4:-*} ${DNSMASQ_CLIENT_ID:-*}"
47     fi
48     ${NVRAM} commit
49fi
50
51
52
53
54 
55