Packet Loss Test

loss_test.sh

#!/bin/bash

# This tool repeatedly sends 100 packets to an internet server (standard: 1.1.1.1 - Cloudflare can take it) 
# in the shortest interval ping allows (0.2s) and reports graphically how many packets were lost.
#
# Requirements: bash, ping, (g)awk

TARGET=1.1.1.1
SCRIPTNAME="loss_test"

# Nice log function
getDATE () { date '+%F %T'; }
NCB='\033[0m'; BLUEBG='\033[44m\033[1m'; GREENBG='\033[42m\033[1m'; REDBG='\033[41m\033[1m'; YELLOWBG='\033[43m\033[1m'
logNice() { if [ "$1" == "ok" ]; then echo -e "${GREENBG}->${NCB} $(getDATE) ($SCRIPTNAME): $2"
			elif [ "$1" == "warn" ]; then echo -e "${YELLOWBG}->${NCB} $(getDATE) ($SCRIPTNAME): $2"
			elif [ "$1" == "fail" ]; then echo -e "${REDBG}x>${NCB} $(getDATE) ($SCRIPTNAME): $2" >&2
			elif [ "$1" = "start" ] || [ "$1" = "stop" ]; then echo -e "${BLUEBG}-> $(getDATE) ($SCRIPTNAME): $2${NCB}"
			else echo -e "${BLUEBG}->${NCB} $(getDATE) ($SCRIPTNAME): $2"; fi }

# Create empty string of length $1 to draw packets
createString(){
	MAX=$(echo "$1" | awk '{print ($0-int($0)>0)?int($0)+1:int($0)}')
	for ((i=1;i<="$MAX";i++))
	do
   		echo -n " "
	done
}

logNice start "Starting packet loss monitoring"
while true
do
	LOSS_DEC=$(ping -i 0.2 -c 100 -q $TARGET | awk '/packet loss/ { print strtonum($6) }')
	LOSS=$(echo "$LOSS_DEC" | awk '{print ($0-int($0)>0)?int($0)+1:int($0)}')
	if [ "$LOSS" -eq "0" ]; then
		logNice ok "$LOSS \t ${GREENBG} ${NCB}"
	else
		LOSS_STRING=$(createString "$LOSS")
		logNice fail "$LOSS \t ${REDBG}${LOSS_STRING}${NCB}"
	fi
done