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Annotation of embedaddon/dnsmasq/contrib/wrt/lease_update.sh, revision 1.1

1.1     ! misho       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: 
        !            20: NVRAM=/usr/sbin/nvram
        !            21: PREFIX=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: 
        !            38: if [ ${1} = init ] ; then
        !            39:      ${NVRAM} show | sed -n -e "/^${PREFIX}.*/ s/^.*=//p"
        !            40: else
        !            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
        !            49: fi
        !            50: 
        !            51: 
        !            52: 
        !            53: 
        !            54: