pfSense

#!/bin/sh

# Usage

if [ $# -ne 1 -a $# -ne 2 ]; then

        echo "Usage : $0 iface"

        exit

fi

# files paths

pid_file=/var/run/iftop_${1}.pid

cache_file=/var/db/iftop_${1}.log

awk_script=/usr/local/bin/iftop_parse.awk

# Binaries paths

DATE=/bin/date

STAT=/usr/bin/stat

CUT=/usr/bin/cut

PS=/bin/ps

GREP=/usr/bin/grep

CAT=/bin/cat

RM=/bin/rm

IFTOP=/usr/local/sbin/iftop

AWK=/usr/bin/awk

# test if pid file exist

if [ -f $pid_file ]; then

        # check how old is the file

        curTS=`$DATE +%s`

        pidTS=`$STAT -r $pid_file | $CUT -d " " -f 10`

        # if more than 10 seconds,

        # it must be a dead pid file (process killed?)

        # or a stucked process that we should kill

        if [ $(( curTS - pidTS )) -gt 10 ]; then

                oldPID=`$CAT $pid_file`

                # test if pid still exist

                run=`$PS -p $oldPID | $GREP -F $0`

                if [ "$run" != "" ]; then

                        kill -9 $oldPID

                fi

                $RM $pid_file

                $RM $cache_file 2>> /dev/null

        else

                if [ -s $cache_file ]; then

                        $CAT $cache_file

                fi

        fi

else

        echo -n $$ > $pid_file

        $IFTOP -nNb -i $1 -s 3 -o 2s -t 2>> /dev/null | $AWK -f $awk_script > ${cache_file}.tmp

        $CAT ${cache_file}.tmp > $cache_file

        $CAT $cache_file

        $RM $pid_file

fi