You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
1.9 KiB
75 lines
1.9 KiB
#!/bin/sh
|
|
#
|
|
# a simple script to check, if there was no smb traffic for the specified
|
|
# number of minutes - then it unmounts the crypto partition
|
|
#
|
|
# you may want to adjust the function "filter_ipt_rules" according to
|
|
# your setup
|
|
#
|
|
# any Parameter are ignored
|
|
#
|
|
# this script has to run as root - as it invokes iptables
|
|
#
|
|
# the iptables rules to detect smb traffic could look like the following:
|
|
# iptables -A INPUT -i eth0 -p udp --dport 138 -j ACCEPT
|
|
# iptables -A INPUT -i eth0 -p tcp --dport 139 -j ACCEPT
|
|
#
|
|
# called by:
|
|
# - cron (/etc/cron.d/cryptobox
|
|
#
|
|
|
|
set -eu
|
|
|
|
# parse config file
|
|
. /etc/cryptobox/cryptobox.conf
|
|
|
|
|
|
############# some functions ##################
|
|
|
|
filter_ipt_rules()
|
|
# get the input rules for smb datagram traffic
|
|
{
|
|
iptables -L INPUT -vnx | grep -E "tcp upt:138|udp dpt:139"
|
|
}
|
|
|
|
|
|
function count_traffic()
|
|
{
|
|
local sum=0
|
|
# fallback if no rules were found
|
|
echo "$sum"
|
|
# extract the number of packets and calculate the sum
|
|
filter_ipt_rules | sed 's/ */ /g' | cut -d " " -f 3 | while read a
|
|
do sum=$((sum+a))
|
|
echo "$sum"
|
|
done | tail -1
|
|
# sorry for the echo-tail-voodoo - i did not know it better :)
|
|
iptables -Z INPUT
|
|
}
|
|
|
|
|
|
################### main ######################
|
|
|
|
# break, if crypto partition is not mounted
|
|
"$CB_SCRIPT" is_crypto_mounted || exit 0
|
|
|
|
# break, if idle timer is turned off
|
|
MAX_IDLE_COUNTER=$("$CB_SCRIPT" get_config timeout)
|
|
[ "$MAX_IDLE_COUNTER" -eq 0 ] && exit 0
|
|
|
|
# config test
|
|
[ -z "`filter_ipt_rules`" ] && echo "[`basename $0`]: Could not find a matching iptables rule!" >>"$LOG_FILE" && exit 1
|
|
|
|
# init idle_counter file, if it does not exist
|
|
[ ! -e "$IDLE_COUNTER_FILE" ] && echo "0" >"$IDLE_COUNTER_FILE"
|
|
|
|
# return true if it was idle
|
|
if [ "$(count_traffic)" -eq 0 ]
|
|
then echo "$(( $(<$IDLE_COUNTER_FILE) +1))"
|
|
else echo 0
|
|
fi >"$IDLE_COUNTER_FILE"
|
|
|
|
# unmount crypto partition, if the threshold was reached
|
|
[ "$(<$IDLE_COUNTER_FILE)" -ge "$MAX_IDLE_COUNTER" ] && \
|
|
"$CB_SCRIPT" crypto-umount >>"$LOG_FILE" 2>&1
|