throttle

#! /usr/bin/env sh

# Usage
#
# To throttle an IP:
#       throttle <pipenumber>  <ip>            <bandwidth>  <packet loss rate>
# e.g.  throttle 2             128.199.40.235  2Kbit/s      .8
#
# You can throttle multiple IPs by specifying different pipenumbers.
#
# To show status: throttle status
#
# To turn off: throttle off

tfile=~/.throttle

status() {
  sudo pfctl -sa  2>&1 | grep "dummynet" | grep "from"
  sudo dnctl show | grep queues | grep -v "999"
}

off() {
  sudo pfctl -f /etc/pf.conf 2>/dev/null
  sudo pfctl -d 2>&1 | grep -v ALTQ
  sudo dnctl -q flush
  rm $tfile
}

case $1 in
  off)
    off
    ;;
  status)
    status
    ;;
  *)
    number=$1
    ip=$2

    speed=$3
    if [ -z "$speed" ]; then
      speed="2Mbit/s"
    fi

    plr=$4
    if [ -z "$plr" ]; then
      plr="0.16"
    fi

    sudo sysctl -w net.inet.ip.forwarding=1
    sudo pfctl -e 2>&1 | grep -v ALTQ
    sudo dnctl pipe "${number}1" config bw $speed plr $plr
    sudo dnctl pipe "${number}2" config bw $speed plr $plr

    echo "dummynet out inet from any to $ip pipe ${number}1" >> $tfile
    echo "dummynet in inet from $ip to any pipe ${number}2" >> $tfile
    sudo pfctl -f ~/.throttle
    status
    ;;
esac