| vendetta007 |
04-23-2009 11:11 PM |
Network repair script
I was having problems with my modem resetting and causing interesting issues with my firewall / routing tables / and NIC status so I built this script. I thought I would post it up so you guys could either help me refine it, use it yourselves, or tell me that something better already exists.
Enjoy
Code:
#!/bin/bash
##################################################################
## Debug Toggle, enter any value to turn on debugging.
DEBUG=''
##################################################################
## Configuration and variable definition.
## The utilities we use are defined here.
CUT="/bin/cut"
EXPR="/usr/bin/expr"
FIREWALL_INIT="/etc/init.d/init.firewall"
GREP="/bin/grep"
IFCONFIG="/sbin/ifconfig"
IFDOWN="/sbin/ifdown"
IFUP="/sbin/ifup"
IPTABLES="/sbin/iptables"
PING="/bin/ping"
ROUTE="/sbin/route"
SERVICE="/sbin/service"
WC="/usr/bin/wc"
## Our resets are initialized here
FIREWALL="N"
GATEWAY="N"
NETWORK="N"
## Our network parameters are defined and gathered here
EXTERNAL="eth0"
INTERNAL="eth1"
CURRENT=`$ROUTE -n | $GREP ^0.0.0.0 | $CUT -d \ -f 10`
# CURRENT=`cat /root/test-route | $GREP ^0.0.0.0 | $CUT -d \ -f 10`
EXT_IP=`$IFCONFIG $EXTERNAL | $GREP inet | $CUT -d : -f 2 | $CUT -d \ -f 1`
INT_IP=`$IFCONFIG $INTERNAL | $GREP inet | $CUT -d : -f 2 | $CUT -d \ -f 1`
NETADDR=`$IFCONFIG |
while read w x y y; do
if [ "$w" = "inet" ]; then
set -- ${x//./ }; a=${1#addr:}; b=$2; c=$3; d=$4;
set -- ${y//./ }; w=${1#Mask:}; x=$2; y=$3; z=$4;
echo $((a&w)).$((b&x)).$((c&y)).$((d&z));
break;
fi;
done`
TEMP=`echo $NETADDR | cut -d . -f 4`
EXT_GW=`echo -n ${NETADDR%$TEMP};((TEMP++));echo $TEMP`
# There are two firewall lengths depending upon whether
# moblock is running or not.
EXPECTED_FW_LENGTH_1=147
EXPECTED_FW_LENGTH_2=166
FIREWALL_LENGTH=`$IPTABLES -L -n | $WC -l`
if [ $DEBUG ]; then
echo "Calculated GW: " $EXT_GW
fi
test() {
#########################################################
## Test for a full firewall
if [ $FIREWALL_LENGTH != $EXPECTED_FW_LENGTH_1 ] && [ $FIREWALL_LENGTH != $EXPECTED_FW_LENGTH_2 ]; then
if [ $DEBUG ]; then
echo "Tag Firewall for Reset";
fi
FIREWALL="Y";
fi
PING_TEST=`$PING -c 1 4.2.2.1 | $GREP "1 received" | $WC -l`
if [ $PING_TEST != 1 ]; then
if [ $DEBUG ]; then
echo "Ping test failed";
else
FIREWALL="Y";
fi
fi
#########################################################
## Test for an invalid EXT_IP
if [ $DEBUG ]; then
echo "Current GW: " $CURRENT
echo -n "External Int: " $EXTERNAL
echo " External IP: " $EXT_IP
echo -n "Internal Int: " $INTERNAL
echo " Internal IP: " $INT_IP
fi
if [ -z $EXT_IP ]; then
if [ $DEBUG ]; then
echo "No External IP"
fi
NETWORK="$EXTERNAL"
fi
if [ -z $INT_IP ]; then
if [ $DEBUG ]; then
echo "No Internal IP"
fi
NETWORK="$INTERNAL"
fi
#########################################################
## Test for an invalid default route and repair it.
if [[ $CURRENT == 192.168.* ]]; then
if [ $DEBUG ] ; then
echo "Class C Private Network";
fi
GATEWAY="Y";
elif [[ $CURRENT =~ 172.* ]]; then
SECOND=`$EXPR "$CURRENT" : '\(...\.[0-9]*\)' | $CUT -d . -f 2`;
if [ $SECOND -ge 16 -a $SECOND -le 32 ]; then
if [ $DEBUG ] ; then
echo "Class B Private Network";
fi
GATEWAY="Y";
fi
elif [[ $CURRENT == 10.* ]]; then
if [ $DEBUG ]; then
echo "Class A Private Network";
fi
GATEWAY="Y";
elif [ -z $CURRENT ]; then
if [ $DEBUG ]; then
echo "Null \$CURRENT value";
fi
NETWORK="all";
FIREWALL="Y";
elif [ $CURRENT = $INT_IP ]; then
if [ $DEBUG ]; then
echo "Routed internally";
fi
GATEWAY="Y";
elif [ $CURRENT = $EXT_IP ]; then
if [ $DEBUG ]; then
echo "Improper External Route";
fi
GATEWAY="Y"
else
if [ $DEBUG ] ; then
echo "Public Network";
fi
fi
}
gateway() {
if [ $DEBUG ]; then
echo "Gateway Reset"
if [ `expr length "$CURRENT"` -gt 15 ]; then
echo "Current gateway too long for single entry"
fi
else
$ROUTE del -net 169.254.0.0 netmask 255.255.0.0 gw 0.0.0.0
$ROUTE del -net 0.0.0.0 gw $INT_IP
if [ `expr length "$CURRENT"` -le 15 ]; then
$ROUTE add -net 0.0.0.0 gw $EXT_GW
fi;
fi
}
firewall() {
if [ $DEBUG ]; then
echo "Init Firewall"
else
$FIREWALL_INIT 0
fi
}
network() {
if [[ $NETWORK -eq $EXTERNAL ]]; then
if [ $DEBUG ]; then
echo "Reset Eth0";
else
$SERVICE network restart;
sleep 10;
fi
GATEWAY="Y";
elif [[ $NETWORK -eq $INTERNAL ]]; then
if [ $DEBUG ]; then
echo "Reset Eth1";
else
$IFCONFIG eth1 down;
$IFCONFIG eth1 up;
fi
elif [[ $NETWORK -eq "all" ]]; then
if [ $DEBUG ]; then
echo "Reset all interfaces";
else
$SERVICE network restart;
fi
GATEWAY="Y";
else
if [ $DEBUG ]; then
echo "No Match";
fi
fi
FIREWALL="Y";
}
test
if [ $DEBUG ]; then
echo -n "Test Status: Network - " $NETWORK
echo -n " Gateway - " $GATEWAY
echo " Firewall - " $FIREWALL
fi
if [[ $NETWORK != 'N' ]]; then
network
fi
if [[ $GATEWAY != 'N' ]]; then
gateway
fi
if [[ $FIRWEALL != 'N' ]]; then
firewall
fi
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