#!/bin/sh
#
# Stefan Tomanek <stefan.tomanek@wertarbyte.de>
# http://wertarbyte.de/debian/
#
# Place in /etc/network/if-up.d/ and link to
# /etc/network/if-down.d/
# 
# Configure additional addresses by specifying
# "addresses" in your /etc/network/interfaces file:
# 
# iface eth0 inet dhcp
#   addresses 10.0.0.1/8 192.168.10.4/24
#   addresses-foo 192.168.2.4/24
#   addresses-bar 172.17.2.1/16

IP=/bin/ip

if [ ! -x $IP ]; then
  exit 0
fi

if [ -n "$IF_ADDRESSES" ]; then
  if [ "$MODE" == "start" ]; then
    OP="add"
  else
    OP="del"
  fi
  # join all addresses-lines
  ADDRESSES=$(/usr/bin/awk 'BEGIN {
        add="";
        for (key in ENVIRON) {
            if (key ~ /^IF_ADDRESSES(-|_|$)/) {
                add=add, ENVIRON[key];
            }
        }
        print add;
      }')
  for ip in $ADDRESSES; do
    $IP addr $OP $ip dev $IFACE
  done
fi