#!/bin/sh
#
# Debian ifupdown hook script for madwifi-ng
#
# Author:   Matt Brown <matt@mattb.net.nz>
# Version:  1.1
#
# Contains a VERY VERY hacked implementation of bridge support, you must
# ensure this script runs before the bridge pre-up script for it to work
# so install this is 0madwifi or something
#
# To bring up a bridge with a madwifi VAP as a component, setup stanzas
# like so, importantly specify no IP address for ath0, so use manual as the 
# stanza type.
#
#    iface ath0 inet manual
#        madwifi_base wifi0
#        wireless_mode ...
#        ...
#
#    auto br0
#    iface br0 inet dhcp
#        madwifi_ports ap2
#        bridge_ports eth0 ap2
#
# Copyright (C) 2005    Matt Brown
#
# This is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# crcnetd; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA 02111-1307 USA
#
WLANCONFIG=/usr/bin/wlanconfig
BRIDGEMODE=0

# Pipe the stanza of a madwifi device to this function and it will set 
# it up...
function create_bridge_interface ()
{
    while read a b c d; do
        if [ "$a" == "iface" ]; then continue; fi
        if [ -z "$a" ]; then break; fi
        # Create variables for stanzas
        name=`echo "$a" | tr a-z A-Z`
        declare -x "IF_$name"="$b"
    done
    # Skip if madwifi base couldn't be found
    if [ -z "$IF_MADWIFI_BASE" ]; then
        echo "Error: no stanza for madwifi interface $mwiface!"
        return
    fi
    # Fix IFACE reference
    export IFACE="$mwiface"
    # Recursively call this script, but MADWIFI_BASE is now defined
    # so we won't get back to this bit and hence the loop will end
    $0 
    # Call wireless tools to setup interface parameters
    /etc/network/if-pre-up.d/wireless-tools
    # Bring the interface up
    ip link set up dev "$IFACE"
}

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

if [ -z "$IF_MADWIFI_BASE" ]; then
    if [ -z "$IF_MADWIFI_PORTS" ]; then
    	exit 0
    fi
    # This is a bridge interface with madwifi components
    # Seeing as we can't recursively call ifup due to Debian bug #231197
    # and friends, we parse /etc/network/interfaces for the stanza
    # ourselves and fake calls to the madwifi and wireless
    for mwiface in "$IF_MADWIFI_PORTS"; do
        (cat /etc/network/interfaces | awk "/^iface $mwiface/,/^$/ {print}") |
        create_bridge_interface        
    done
    # We've done all we can
    exit 0
fi

# Check for interface
if ip link list $IFACE &>/dev/null; then
	# Destroy 
	$WLANCONFIG $IFACE destroy
fi

case "$IF_WIRELESS_MODE" in
Managed|managed|MANAGED)
	MODE="sta"
	;;
Ad-Hoc|ad-hoc|AD-HOC)
	MODE="adhoc"
	;;
Master|master|MASTER)
	MODE="ap"
	;;
Monitor|monitor|MONITOR)
	MODE="monitor"
	;;
*)
	MODE="sta"
	;;
esac

# Create or recreate interface
$WLANCONFIG $IFACE create wlandev $IF_MADWIFI_BASE wlanmode $MODE &>/dev/null
exit $?