Bandwidth / latency limiter for player development in Mac OSX

bandwidth_limiter.bash

#!/bin/bash

#
# author: Stephan Hesse (disparat@gmail.com)
# 
echo ""
echo "************ tape.tv CDN testing tool *************"
echo ""
echo "Author: Stephan Hesse <disparat@gmail.com>"
echo ""
echo "+++ Bandwidth / latency limiter for player development in Mac OSX +++"
echo ""

if [ -z "$2" ] 

	then 

	echo "Usage: <command> <bandwidth in Mbit/s> <half-trip latency in milliseconds>"
	echo "Usage: <command> <bandwidth in Mbit/s> <half-trip latency in milliseconds> <entry point IP>"

	echo ""
        echo "To set up limitation upon ALL connections enter 'any' for the IP"
        echo ""
	echo "If no IP is specified, the hard-coded default entry point will be used." 
	echo ""

	echo ""
	echo "Not enough arguments, quitting ..."
	echo ""
	exit
fi

IP="37.44.5.5"

BANDWIDTH=$1
BANDWIDTH+="Mbit/s"

LATENCY=$2
LATENCY+="ms" 

echo "> Limiting connection to CDN: $BANDWIDTH with $LATENCY delay / way"

echo "> Default entry point IP: $IP"

echo "> Flushing all existing ipfw rules ..."

sudo ipfw -q flush

if [ $1 -lt 0 ]
then

	echo "> Not setting any new rules, bye." 
	exit

fi

echo "> Adding pipes for test server IPs"

if [ -n "$3" ]
then
	echo "> Using IP from shell argument"
	IP=$3

else
	echo "> Using default IP"
fi

echo "> Using duplex pipe on IP: $IP (two-way) " 

if [ $IP = "any" ]; then

	sudo ipfw add pipe 1 ip from any to $IP

else
	sudo ipfw add pipe 1 ip from any to $IP
	sudo ipfw add pipe 2 ip from $IP to any
fi

echo "> Applying bandwidth / latency rules to pipes"

if [ $IP = "any" ]; then

	sudo ipfw pipe 1 config delay $LATENCY bw $BANDWIDTH plr 0.1

else
	sudo ipfw pipe 1 config delay $LATENCY bw $BANDWIDTH plr 0.1
	sudo ipfw pipe 2 config delay $LATENCY bw $BANDWIDTH plr 0.1
fi

echo "> Done."
echo ""

echo "> Performing ping test to server ..."
echo ""

ping 37.44.5.5

echo ""
echo "Quitting, bye."