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|
#!/bin/sh
set -eu
verbose=${verbose-''}
if [ "${verbose}" = "yes" ]; then
set -x
fi
interface="eth1"
sync_wait_start=1
this_host=$(hostname)
host=${this_host}
ip6="not ip6"
ascii=
count=
usage() {
cat <<EOF >/dev/stderr
Usage:
$0 --start [ -i <ethX> ] [--host <hostname>] [ -c <count> ]
$0 --stop [ -i <ethX> ] [--host <hostname>] [--ip6] [-A] [ -- <tcpdump-options> ]
$0 --kill [ -i <ethX> ] [--host <hostname>]
$0 --wait [ -i <ethX> ] [--host <hostname>] [ -- <tcpdump-options> ]
Start tcpdump saving output to /tmp/
Stop tcpdump and dump captured output to the console
Kill tcpdump
Specify --host to only run on <hostname>.
EOF
}
if test $# -lt 1; then
usage
exit 1
fi
action=
while test $# -gt 0; do
case "$1" in
-h | --help )
usage
exit 0
shift
;;
--host )
host=$2
shift 2
;;
-i )
interface=$2
shift 2
;;
-ip6 | -6 )
ip6=''
shift
;;
-A )
ascii=-A
shift
;;
-c | --count )
count="-c $2"
shift 2
;;
--start )
action="start"
shift
;;
--stop )
action="stop"
shift
;;
--wait )
action="wait"
shift
;;
--kill )
action="kill"
shift
;;
-- )
break;
;;
* )
echo "unrecognized option: $1" 1>&2
exit 1
;;
esac
done
# set the extra arguments to tcpdump
if test $# -gt 0 ; then
shift # drop --
else
set -- ${ascii} not arp and ${ip6} and not stp
fi
# set the output files and paths
set_file_names()
{
tmp_dir=/tmp
testname=$(basename ${PWD})
tcpdump=$(echo ${host}.${testname}.${interface}.tcpdump | tr : .)
out_path="${tmp_dir}/${tcpdump}.pcap"
log_path="${tmp_dir}/${tcpdump}.log"
pid_path="${tmp_dir}/${tcpdump}.pid"
}
start_tcpdump()
{
# call stop if there are any previous runawy tcpdump - don't show output
stop_tcpdump >/dev/null 2>&1
rm -f ${out_path}
rm -f ${log_path}
rm -f ${pid_path}
tcpdump ${count} -s 0 -i ${interface} -w ${out_path} > ${log_path} 2>&1 &
echo $! > ${pid_path}
sleep ${sync_wait_start}
echo tcpdump started
}
stop_tcpdump()
{
if test -r ${pid_path} ; then
pid=$(cat ${pid_path})
(kill -TERM ${pid} 2> /dev/null > /dev/null)
if [ -f ${out_path} ]; then
# wait for tcpudump output to write and sync
sleep 1
while kill -0 ${pid} > /dev/null 2>&1 ; do
sleep 1
done
for f in ${out_path} ${log_path} ; do
cp ${f} OUTPUT/
done
rm -f ${pid_path}
fi
else
echo tcpdump ${pid_path} is not running
fi
}
wait_tcpdump()
{
if test -r ${pid_path} ; then
pid=$(cat ${pid_path})
c=30
while kill -0 ${pid} > /dev/null 2>&1 && test $c -gt 0 ; do
sleep 1
c=$(expr $c - 1)
done
if test $c -eq 0 ; then
echo timeout waiting for tcpdump ${pid} to exit 1>&2
exit 1
fi
sleep 1
for f in ${out_path} ${log_path} ; do
cp ${f} OUTPUT/
done
rm -f ${pid_path}
else
echo tcpdump ${pid_path} is not running
fi
}
if [ "${host}" != "${this_host}" ]; then
exit 0
fi
set_file_names
case "${action}" in
start)
start_tcpdump
;;
stop)
stop_tcpdump
tcpdump -n -r OUTPUT/$(basename ${out_path}) "$@"
;;
wait)
wait_tcpdump
tcpdump -n -r OUTPUT/$(basename ${out_path}) "$@"
;;
kill)
stop_tcpdump
;;
esac
|
