dsniffd

#!/usr/bin/env sh

#set -x
set -e

export LANG="C"
export PATH="/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"

con=${CONNECTION:-`nmcli -g uuid,state connection | awk -F ':' '$2=="activated" {print $1; exit}'`}
if=`nmcli -t connection show $con | sed -n -E "/^GENERAL\.DEVICES:/s///p"`

TEMP=$(getopt -o 'hi:' --long 'help,interface:' -n "$0" -- "$@")

if [ $? -ne 0 ]; then
	usage
	echo 'Terminating...' >&2
	exit 1
fi

# Note the quotes around "$TEMP": they are essential!
eval set -- "$TEMP"
unset TEMP

while true; do
	case "$1" in
		'-h'|'--help')
			echo 'Option -h, --help'
			shift 1
			usage
			exit
		;;
		'-i'|'--interface')
			echo "Option -i, --interface; argument '$2'"
			if="$2"
			shift 2
			continue
		;;
		'--')
			shift
			break
		;;
		*)
			echo 'Internal error!' >&2
			exit 1
		;;
	esac
done

echo 'Remaining arguments:'
for arg; do
	echo "--> '$arg'"
done

if [ ! "$if" ]; then
	echo "Konnte Interface nicht ermitteln :-(" 1>&2
	exit 1
else
	echo "Interface ($if) ermittelt :-)"
fi

dir="/var/tmp/`basename "$0"`.$if"
mkdir -p $dir && cd $dir
pwd

dsniff_pid="dsniff.pid"
db="dsniff.$if.db"
log="`basename "$0"`.log"

# check write permissions amongst other things
touch $dir $dsniff_pid $db $log

usage () {
	cat <<! 1>&2
Usage: $0 -i <interface> <start|stop|status> ;-)
!
	exit 1
}
startup () {
	daemonize -e $log -o /var/tmp/dsniffd.out.txt -c $dir -l $dsniff_pid -p $dsniff_pid -u root /usr/sbin/dsniff -i $if # -w $db
}
cleanup () {
	pkill -F $dsniff_pid
	#db5.3_dump "$db" >>/var/tmp/dsniffd.out.txt && rm -r -- "$dir"
}
status () {
	tail $log
}
case "$1" in
	start)
		shift
		startup "$@"
	;;
	stop)
		cleanup
	;;
	status)
		status
	;;
	*)
		usage
	;;
esac