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Improved version of the check_gateway script

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in case the vpn is offline, also shutdown radvd and dhcpd so that
clients get a new default gateway when their lease time expires
This commit is contained in:
ohrensessel 2014-08-19 11:19:59 +02:00
parent f555ac2276
commit a9c15dd2ff
1 changed files with 22 additions and 7 deletions
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29
files/usr/local/bin/check_gateway
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@ -1,7 +1,8 @@
#!/bin/bash #!/bin/bash
INTERFACE=mullvad INTERFACE=mullvad # Set to name of VPN interface
shopt -s nullglob shopt -s nullglob
# Test whether gateway is connected to the outer world via VPN
ping -q -I $INTERFACE 8.8.8.8 -c 4 -i 1 -W 5 >/dev/null 2>&1 ping -q -I $INTERFACE 8.8.8.8 -c 4 -i 1 -W 5 >/dev/null 2>&1
if test $? -eq 0; then if test $? -eq 0; then
@ -10,13 +11,27 @@ else
NEW_STATE=off NEW_STATE=off
fi fi
# Iterate through network interfaces in sys file system
for MESH in /sys/class/net/*/mesh; do for MESH in /sys/class/net/*/mesh; do
# Check whether gateway modus needs to be changed
OLD_STATE="$(cat $MESH/gw_mode)" OLD_STATE="$(cat $MESH/gw_mode)"
[ "$OLD_STATE" == "$NEW_STATE" ] && continue [ "$OLD_STATE" == "$NEW_STATE" ] && continue
echo $NEW_STATE > $MESH/gw_mode echo $NEW_STATE > $MESH/gw_mode
echo 54MBit/54MBit > $MESH/gw_bandwidth echo 54MBit/54MBit > $MESH/gw_bandwidth
logger "batman gateway mode changed to $NEW_STATE" logger "batman gateway mode changed to $NEW_STATE"
# Check whether gateway modus has been deactivated
if [ "$NEW_STATE" == "off" ]; then
# Shutdown DHCP server to prevent renewal of leases
service isc-dhcp-server stop
# Shutdown radvd daemon to prevent advertisment of server as gateway
service radvd stop
fi
# Check whether gateway modus has been activated
if [ "$NEW_STATE" == "server" ]; then
# Restart DHCP server and radvd daemon
service isc-dhcp-server start
service radvd start
fi
done done
# vim: noai:ts=4:sw=4:ff=unix:ft=text:fdm=marker