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nullroute
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nullroute
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#!/bin/sh
#
# Copyright (c) 2015 Babak Farrokhi. 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 AUTHOR 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 AUTHOR 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.
#
# this script nullroutes a give CIDR
#
#
ROUTE="/sbin/route"
NETSTAT="/usr/bin/netstat"
GREP="/usr/bin/grep"
AWK="/usr/bin/awk"
CFG="/usr/local/etc/nullroute.conf"
nullroute() {
local ADDR=${1}; shift;
${ROUTE} add -net ${ADDR} 127.0.0.1 -blackhole
}
delroute() {
local ADDR=${1}; shift;
${ROUTE} delete ${ADDR}
}
showroute() {
${NETSTAT} -rn | ${GREP} "SB " | ${AWK} '{print $1}'
}
loadroutes() {
if [ ! -f ${CFG} ]; then
echo "Cannot open ${CFG}"
exit 1
fi
for R in `cat ${CFG} | ${GREP} -E -v '^[[:space:]]*$'`; do
nullroute ${R}
done
}
saveroutes() {
showroute > ${CFG} && echo "configuration saved to ${CFG}"
}
flush() {
for R in `${NETSTAT} -rn | ${GREP} "SB " | ${AWK} '{print $1}'`; do
delroute ${R}
done
}
help() {
echo "$0 [ add <host> | del <host> | show | load | save | flush ]"
}
if [ $# -lt 1 ]; then
help
exit 1
fi
case ${1} in
add)
if [ x${2} == x ]; then
help
exit 1
fi
nullroute ${2}
;;
del)
if [ x${2} == x ]; then
help
exit 1
fi
delroute ${2}
;;
show)
showroute
;;
load)
loadroutes
;;
save)
saveroutes
;;
flush)
flush
;;
*)
help
;;
esac