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