115 lines
2.4 KiB
Plaintext
115 lines
2.4 KiB
Plaintext
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#!/bin/sh
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#
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# Copyright (c) 2015 Babak Farrokhi. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# this script nullroutes a give CIDR
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#
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#
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ROUTE="/sbin/route"
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NETSTAT="/usr/bin/netstat"
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GREP="/usr/bin/grep"
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AWK="/usr/bin/awk"
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CFG="/usr/local/etc/nullroute.conf"
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nullroute() {
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local ADDR=${1}; shift;
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${ROUTE} add -net ${ADDR} 127.0.0.1 -blackhole
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}
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delroute() {
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local ADDR=${1}; shift;
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${ROUTE} delete ${ADDR}
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}
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showroute() {
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${NETSTAT} -rn | ${GREP} "SB " | ${AWK} '{print $1}'
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}
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loadroutes() {
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if [ ! -f ${CFG} ]; then
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echo "Cannot open ${CFG}"
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exit 1
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fi
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for R in `cat ${CFG} | ${GREP} -E -v '^[[:space:]]*$'`; do
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nullroute ${R}
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done
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}
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saveroutes() {
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showroute > ${CFG} && echo "configuration saved to ${CFG}"
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}
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flush() {
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for R in `${NETSTAT} -rn | ${GREP} "SB " | ${AWK} '{print $1}'`; do
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delroute ${R}
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done
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}
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help() {
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echo "$0 [ add <host> | del <host> | show | load | save | flush ]"
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}
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if [ $# -lt 1 ]; then
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help
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exit 1
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fi
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case ${1} in
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add)
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if [ x${2} == x ]; then
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help
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exit 1
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fi
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nullroute ${2}
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;;
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del)
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if [ x${2} == x ]; then
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help
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exit 1
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fi
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delroute ${2}
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;;
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show)
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showroute
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;;
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load)
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loadroutes
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;;
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save)
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saveroutes
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;;
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flush)
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flush
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;;
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*)
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help
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;;
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esac
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