Add first bunch of scripts

nullroute

@@ -0,0 +1,114 @@
+#!/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		
+