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March 17, 2021 05:15
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#!/bin/sh | |
# | |
# Copyright (c) 2020 Kimmo Suominen | |
# All rights reserved. | |
# | |
# Redistribution and use in source and binary forms, with or without | |
# modification, are permitted provided that the following conditions | |
# are met: | |
# | |
# 1. Redistributions of source code must retain the above copyright | |
# notice, this list of conditions and the following disclaimer. | |
# | |
# 2. Redistributions in binary form must reproduce the above copyright | |
# notice, this list of conditions and the following disclaimer | |
# in the documentation and/or other materials provided with the | |
# distribution. | |
# | |
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
# | |
# | |
# Report on dhcpcd(8) lease dump data | |
# | |
# 20201019 Kimmo Suominen | |
# | |
set -eu | |
PATH=/bin:/usr/bin:/sbin:/usr/sbin | |
export PATH | |
PROG="${0##*/}" | |
PDIR="${0%/*}" | |
dhcpcd=dhcpcd | |
case "${PDIR}" in | |
/*) | |
if [ -x "${PDIR}/dhcpcd" ] | |
then | |
dhcpcd="${PDIR}/dhcpcd" | |
fi | |
;; | |
esac | |
die() | |
{ | |
echo "${PROG}: ${*}" 1>&2 | |
exit 1 | |
} | |
get_dhcpcd_dump() | |
{ | |
"${dhcpcd}" -U \ | |
| sed -n ' | |
/^reason=ROUTERADVERT$/,/^$/ { | |
p | |
} | |
' | |
} | |
get_interface_nd_data() | |
{ | |
local interface nd data | |
interface="${1}" | |
nd="${2}" | |
data="${3}" | |
echo "${data}" \ | |
| sed -n ' | |
/^interface='"${interface}"'$/,/^$/ { | |
/^nd'"${nd}"'_/ { | |
s//_/ | |
p | |
} | |
} | |
' | |
} | |
get_interfaces() | |
{ | |
echo "${1}" \ | |
| sed -n ' | |
/^interface=/ { | |
s/// | |
p | |
} | |
' | |
} | |
# | |
# Mimic "ndp -r" output from "dhcpcd -U" data | |
# | |
ndp_r() | |
{ | |
local data | |
data="${1}" | |
for int in $(get_interfaces "${data}") | |
do | |
i=1 | |
while : | |
do | |
_from= | |
eval $(get_interface_nd_data "${int}" "${i}" "${data}") | |
if [ "${_from:+exists}" != "exists" ] | |
then | |
break | |
fi | |
echo -n "${_from}" | |
case "${_from}" in | |
fe80:*) | |
echo -n "%${int}" | |
;; | |
esac | |
echo -n " if=${int}" | |
flags= | |
pref=medium | |
for flag in $(echo "${_flags}" | grep -i .) | |
do | |
case "${flag}" in | |
h) | |
pref=high | |
;; | |
*) | |
flags="${flags}${flag}" | |
;; | |
esac | |
done | |
echo -n ", flags=${flags}, pref=${pref}" | |
exp=$((${_lifetime} + ${_acquired} - ${_now})) | |
exp_minutes=$((${exp} / 60)) | |
exp_seconds=$((${exp} % 60)) | |
echo -n ", expire=" | |
[ ${exp_minutes} -gt 0 ] && echo -n "${exp_minutes}m" | |
echo -n "${exp_seconds}s" | |
echo | |
i=$((${i} + 1)) | |
done | |
done | |
} | |
usage() | |
{ | |
cat <<EOF | |
Usage: ${PROG} [-r] [-f file] | |
${PROG} -h | |
Options: | |
-f Read dhcpcd(8) lease dump data from a file | |
-h Show this usage message | |
-r Show default router list | |
EOF | |
} | |
# It is the only mode for now, so make it default | |
mode=ndp_r | |
source= | |
while getopts f:hr opt | |
do | |
case "${opt}" in | |
f) source="${OPTARG}";; | |
h) usage; exit 0;; | |
r) mode=ndp_r;; | |
n) noop=true;; | |
p) mode=prune;; | |
*) usage 1>&2; exit 1;; | |
esac | |
done | |
shift $((${OPTIND} - 1)) | |
case "${source}" in | |
'') | |
data="$(get_dhcpcd_dump)" | |
;; | |
*) | |
if [ -r "${source}" ] | |
then | |
data="$(cat "${source}")" | |
else | |
die "Cannot read '${source}'" | |
fi | |
;; | |
esac | |
case "${mode}" in | |
ndp_r) | |
ndp_r "${data}" | |
;; | |
*) | |
die "Unknown mode '${mode}'" | |
;; | |
esac |
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