latancy_doc.sh

#!/bin/bash
Version="0.3 Bata"
#Author=Kenneth Foster

help_menu="
usage: $0 -d <IP> -f <INPUT fILE>

-d,	Required option, the destination ip for the connection you want to track
-f,	Required option, this is the input file for the script to read from.  it should contain the output of fw monitor with the flags -T -u.
-v,	show the version and exit
-h, 	show this help menu and exit
"

#Function to confirm that an IP is correctly formated
function valid_ip()
{
    local  ip=$1
    local  stat=1

    if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
        OIFS=$IFS
        IFS='.'
        ip=("$ip")
        IFS=$OIFS
        [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
            && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
        stat=$?
    fi
        echo $stat
    return $stat

}

#Function to calculate the time difference between to timestamps
function time_diff()
{
        local time1=$1
        local time2=$2
        #echo $time1 $time2
        local time1_nano
	time1_nano=$(date +%S%N -d "$time1")
        local time2_nano
	time2_nano=$(date +%S%N -d "$time2")
        #echo $time1_nano
        #echo $time2_nano
        echo "scale=5; ($time2_nano - $time1_nano)/1000000" | bc

}

if [ $# -eq 0 ]; then
	echo "$0: Error: No options provided" >&2
	echo "$help_menu"
	exit 1
fi
while getopts ":vhd:f:" opt; do
  	case $opt in
		v)
			echo "version: $Version"
			exit 0
		;;
		d)
			DEST=$OPTARG
			if [ ! "$("valid_ip $OPTARG")" -eq 0 ]; then 
				echo "$0: -d:$OPTARG is not a valid IP address"	>&2
				exit 1
			fi
   		;;
		f)
			if [ -r "$OPTARG"  ]; then
				inFile=$OPTARG
			else
				echo "$0: -f: $OPTARG is not a vaild file. make sure the file exists and is readable" >&2
				exit 1
			fi
		;;
		h)
			echo "$help_menu"
			exit 0
		;;
    		\?)
      			echo "Invalid option: -$OPTARG" >&2
      			exit 1
      		;;
		:)
			echo "Option -$OPTARG requires an argument." >&2
      			exit 1
		;;
	esac	
done

isIPInfile=$(grep "$DEST" "$inFile") 

if [ "$isIPInfile" = "" ]; then
	echo "$0: Error: $DEST was not found in $inFile" >&2
	exit 2
fi

#get the first id before the UUID is set, and the time of the first packet.
firstID=( $(sed 'N; s/\(id=[0-9]*\)\n/\1 /g' "$inFile" | grep -e "\[00000000 - 00000000 00000000 00000000 00000000\].*$DEST" | awk 'NR==1 { print $3" "$15}') )
echo "${firstID[@]}"
#use the id of the first packet to get the UUID for the connection
UUID=$(grep -e "${firstID[1]}"  "$inFile" | awk -F"[" 'NR==2 {print $4; } ' | awk -F] '{print $1}')

#create an array of all the times and id for the packets in the connection
arr=( $(echo "${firstID[@]}"; grep "$UUID" "$inFile" | awk '{print $3" "$15}') )
#get the total number of entries in the arra
arr_count=${#arr[@]}
#echo $arr_count
#loop through the array 
for i in "${!arr[@]}"; do
	if [ $(("$i" % 2 )) -eq 0 ]; then
		if [ ! "$i" -eq $((arr_count -2)) ]; then
			#echo old $i
			#echo i is ${arr[$i]}
			id=$((i+1))
			j=$((i+2))
			jid=$((j+1))
	
			#echo j is${arr[$j]}
			echo first "${arr[$id]}"
			echo second "${arr[$jid]}"
				#if [  ${arr[$id]} = ${arr[$jid]} ]; then
					timeMS=$(time_diff "${arr[$i]}" "${arr[$j]}")
					echo "$timeMS" ms
				#else
					#echo failed
				#fi
			#sleep 5
		fi
	fi
done

#echo ${arr[@]} | sed 's/\(id=[0-9]*\)/\1\n/g' | nl