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does not clutter up the disk so fast now; does not re-start tcpdump

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Artem 2011-10-23 01:58:43 +02:00 • committed by Steve Schnepp
parent fda468784f
commit b6fb15597c
1 changed files with 62 additions and 28 deletions
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90
plugins/other/host_traffic
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@ -1,64 +1,98 @@
#!/bin/bash
# probably will run with sh
# Plugin to monitor traffic rate to specific host.
#
# Requirements:
# - tcpdump
# - should be run as root or any other user for tcpdump
# - tcpdump
# - should be run as root or any other user for tcpdump
#
# Parameters supported:
#
# config
# config
# autoconf
#
# Configurable variables
#
# type - monitor type. Available values: packets, bytes. Defaults to packets because it's faster
# hostname - mandatory. Hostname (ip) to monitor connections to. Actually just a part of tcpdump expr
# type - monitor type. Available values: packets, bytes. Defaults to packets because it's faster
# hostname - mandatory. Hostname (ip) to monitor connections to. Actually just a part of tcpdump expr.
# Thus a hack: '1.2.3.4 and port 80' will monitor port 80 only. Bingo!
# interface - self-explanatory
#
# IMPORTANT! This plugin spawns 'tcpdump' process along with bash shell piping tcpdump output there
# PLEASE DO NOT FORGET TO KILL when removing plugin/stopping/etc. You can kill any of three, the others should die
#
# Revision 0.1 2011/08/06 Artem Sheremet
# Revision 0.2 2011/10/23 -
INTERVAL=300
if [ -z "$type" ]; then
type=packets
fi
if [ -z "$hostname" ]; then
echo "Configuration problem"
echo "Configuration problem" >&2
exit 1
fi
if [ "$interface" ]; then
interface="-i $interface"
fi
TCPDUMP="tcpdump $interface -nqt host $hostname"
if [ "$1" = "config" ]; then
echo "graph_title Number of $type to and from $hostname"
echo "graph_title Number of $type for host $hostname"
if [ "$type" == "bytes" ]; then
echo "graph_args --base 1024"
fi
echo "graph_category network"
echo "graph_vlabel $type per second"
echo "graph_info This plugin shows number of $type within $hostname through the tcp protocol using tcpdump"
echo "$type.label $type within $hostname"
echo "graph_info This plugin shows number of $type within host $hostname through the tcp protocol using tcpdump"
echo "rate.label $type within $hostname"
exit 0
fi
TMP_DIR=/tmp/host_traffic_${hostname}_${type}
TMP_DIR="/tmp/host_traffic_${hostname}_${type}"
if [ ! -f $TMP_DIR ]; then
mkdir -p $TMP_DIR
if [ ! -d "$TMP_DIR" ]; then
mkdir -p "$TMP_DIR"
fi
if [ -f $TMP_DIR/pid ]; then
if [ "$type" == "packets" ]; then
echo packets.value $[`wc -l $TMP_DIR/data | cut -d' ' -f1`/300]
fi
if [ -f "$TMP_DIR/pid" ]; then
PID=`cat "$TMP_DIR/pid"`
kill -TERM `cat $TMP_DIR/pid`
if [ "$type" == "bytes" ]; then
gawk -Ftcp '
BEGIN { total = "U"; } # U = Unknown.
{ total = total + $2; }
END { print "bytes.value", total/300; }' $TMP_DIR/data
fi
if [ -z "$PID" -o ! -d /proc/$PID ]; then
unset PID
fi
fi
tcpdump -n -q -t host $hostname >$TMP_DIR/data 2>/dev/null &
echo $! > $TMP_DIR/pid
if [ "$PID" ]; then
rm -f "$TMP_DIR/value"
# IPC: call data print & reset
kill -USR1 $PID
# wait 10 sec for data to arrive
for i in {1..10}; do
if [ -r "$TMP_DIR/value" ]; then
VALUE=`cat "$TMP_DIR/value"`
echo $VALUE $INTERVAL | awk '{ printf("rate.value %.3f\n", $1/$2) }'
exit 0
fi
sleep 1
done
echo "rate.value U"
else
$TCPDUMP 2>/dev/null | (
COUNTER=0
# IPC: install SIGUSR1 handler
trap 'echo $COUNTER > "$TMP_DIR/value"; COUNTER=0' SIGUSR1
echo $BASHPID >"$TMP_DIR/pid"
while read line; do
if [[ "$type" == "bytes" ]]; then
# get the last field separated by space
COUNTER=$(($COUNTER+${line/* /})) 2>/dev/null
else
COUNTER=$(($COUNTER+1))
fi
done
) 2>/dev/null &
fi