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#!/bin/sh
PIDFILE=/tmp/tcpdump.pid
TCPDUMP=/usr/sbin/tcpdump
TESTCASE=$1
echo "------ $TESTCASE ------"
date
if [ "z$TTCN3_PCAP_PATH" = "z" ]; then
TTCN3_PCAP_PATH=/tmp
fi
if [ -e $PIDFILE ]; then
kill "$(cat "$PIDFILE")"
rm $PIDFILE
fi
# NOTE: This requires you to be root or something like
# "laforge ALL=NOPASSWD: /usr/sbin/tcpdump, /bin/kill" in your sudoers file
if [ "$(id -u)" = "0" ]; then
CMD=$TCPDUMP
else
CMD="sudo $TCPDUMP"
fi
$CMD -U -s 1500 -n -i any -w "$TTCN3_PCAP_PATH/$TESTCASE.pcap" >$TTCN3_PCAP_PATH/$TESTCASE.pcap.stdout 2>&1 &
PID=$!
echo $PID > $PIDFILE
# Wait until tcpdump creates the pcap file and starts recording.
# We generate some traffic until we see tcpdump catches it.
# Timeout is 10 seconds.
ping 127.0.0.1 >/dev/null 2>&1 &
PID=$!
i=0
while [ ! -f "$TTCN3_PCAP_PATH/$TESTCASE.pcap" ] ||
[ "$(stat -c '%s' "$TTCN3_PCAP_PATH/$TESTCASE.pcap")" -eq 32 ]
do
echo "Waiting for tcpdump to start... $i"
sleep 1
i=$((i+1))
if [ $i -eq 10 ]; then
break
fi
done
kill $PID
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