mirror of
https://github.com/munin-monitoring/contrib.git
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98 lines
2.5 KiB
Bash
Executable file
98 lines
2.5 KiB
Bash
Executable file
#!/bin/bash
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# Plugin to monitor traffic rate to specific host.
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#
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# Requirements:
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# - tcpdump
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# - should be run as root or any other user for tcpdump
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#
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# Parameters supported:
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# config
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# autoconf
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#
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# Configurable variables
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#
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# type - monitor type. Available values: packets, bytes. Defaults to packets because it's faster
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# hostname - mandatory. Hostname (ip) to monitor connections to. Actually just a part of tcpdump expr.
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# Thus a hack: '1.2.3.4 and port 80' will monitor port 80 only. Bingo!
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# interface - self-explanatory
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#
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# IMPORTANT! This plugin spawns 'tcpdump' process along with bash shell piping tcpdump output there
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# PLEASE DO NOT FORGET TO KILL when removing plugin/stopping/etc. You can kill any of three, the others should die
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#
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# Revision 0.1 2011/08/06 Artem Sheremet
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# Revision 0.2 2011/10/23 -
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INTERVAL=300
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if [ -z "$type" ]; then
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type=packets
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fi
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if [ -z "$hostname" ]; then
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echo "Configuration problem" >&2
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exit 1
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fi
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if [ "$interface" ]; then
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interface="-i $interface"
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fi
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TCPDUMP="tcpdump $interface -nqt host $hostname"
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if [ "$1" = "config" ]; then
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echo "graph_title Number of $type for host $hostname"
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if [ "$type" == "bytes" ]; then
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echo "graph_args --base 1024"
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fi
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echo "graph_category network"
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echo "graph_vlabel $type per second"
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echo "graph_info This plugin shows number of $type within host $hostname through the tcp protocol using tcpdump"
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echo "rate.label $type within $hostname"
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exit 0
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fi
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TMP_DIR="/tmp/host_traffic_${hostname}_${type}"
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if [ ! -d "$TMP_DIR" ]; then
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mkdir -p "$TMP_DIR"
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fi
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if [ -f "$TMP_DIR/pid" ]; then
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PID=`cat "$TMP_DIR/pid"`
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if [ -z "$PID" -o ! -d /proc/$PID ]; then
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unset PID
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fi
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fi
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if [ "$PID" ]; then
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rm -f "$TMP_DIR/value"
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# IPC: call data print & reset
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kill -USR1 $PID
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# wait 10 sec for data to arrive
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for i in {1..10}; do
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if [ -r "$TMP_DIR/value" ]; then
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VALUE=`cat "$TMP_DIR/value"`
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echo $VALUE $INTERVAL | awk '{ printf("rate.value %.3f\n", $1/$2) }'
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exit 0
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fi
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sleep 1
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done
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echo "rate.value U"
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else
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$TCPDUMP 2>/dev/null | (
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COUNTER=0
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# IPC: install SIGUSR1 handler
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trap 'echo $COUNTER > "$TMP_DIR/value"; COUNTER=0' SIGUSR1
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echo $BASHPID >"$TMP_DIR/pid"
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while read line; do
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if [[ "$type" == "bytes" ]]; then
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# get the last field separated by space
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COUNTER=$(($COUNTER+${line/* /})) 2>/dev/null
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else
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COUNTER=$(($COUNTER+1))
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fi
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done
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) 2>/dev/null &
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fi
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