#!/bin/bash

IWCONF=/sbin/iwconfig
IWLIST=/sbin/iwlist
CONFDIR=/etc/network/autowifi

function apply ()
{
    echo "$IWCONF" "$@";
    "$IWCONF" "$@"
}

function reset_ipw2200 ()
{
# the ipw2200 scanning for open networks doesn't work properly
# if the _wep module is loaded. actually, the ipw2200 is flaky
# generally so whack it upside the head once or twice before we
# start: It needs a bit of abuse to work right.
    echo "removing ipw2200 modules (if any)";
    (rmmod ipw2200            2> /dev/null || true);
    (rmmod iee80211_crypt_wep 2> /dev/null || true);
    (rmmod iee80211_crypt     2> /dev/null || true);
    (rmmod iee80211           2> /dev/null || true);
    echo "reloading ipw200";
    modprobe ipw2200 antenna=2 hwcrypto=0;
    echo -n "ACPI suspending $IFACE .";
    echo -n 3 > /sys/class/net/$IFACE/device/power/state
    echo -n ".";
    sleep 1;
    echo -n ". resuming ."
    echo -n 0 > /sys/class/net/$IFACE/device/power/state
    echo -n ".";
    sleep 3;
    echo ". Up and Running";
}


if [ "x$IFACE" = "xeth1" ];
then
    echo "processing eth1";
else
    exit 0;
fi;

reset_ipw2200;

ifconfig eth1 up;
$IWCONF $IFACE ap      any;
$IWCONF $IFACE essid   any;
$IWCONF $IFACE key     off;
$IWCONF $IFACE channel 0;

CONFIGURED="";
FIRST_MAC="";
FIRST_ESS="";
PREV_MAC="";
PREV_ESS="";

while read;
do
    SETTING=$( echo -n "$REPLY" |
               sed -e 's/^\(\(.* - \)\|^ \+\)\([^:]\+\).*/\3/; ' );
    VALUE=$(echo -n "$REPLY"|sed -e 's/^[^:]\+: *//; s/ *$//; s/"\(.*\)"/\1/');
    
    if [ "x$SETTING" = "xEncryption key" ];
    then
        echo "$SETTING:'$VALUE'";
        if [ "x$VALUE" = "xoff" ];
        then
            echo "hm... key is off. checking $PREV_MAC";
            if [ "x$PREV_ESS" = "x<hidden>" ];
            then
                echo "Open network $PREV_MAC has a hidden ESSID, skipping..."
            else
                FIRST_MAC=${FIRST_MAC:-$PREV_MAC}
                FIRST_ESS=${FIRST_ESS:-$PREV_ESS}
            fi;
        fi;
    fi;
        
    if   [ "x$SETTING" = "xAddress" ];
    then
        PREV_MAC="$VALUE"
        SPEC="$CONFDIR/MAC:$VALUE";
    elif [ "x$SETTING" = "xESSID"   ];
    then
        PREV_ESS="$VALUE";
        SPEC="$CONFDIR/ESSID:$VALUE";
    else
        SPEC=""
        continue;
    fi;

    echo "checking for $SPEC";
    if [ -r "$SPEC" ];
    then
        CONFIGURED=1;
        apply $IFACE essid   any;
        apply $IFACE ap      any;
        apply $IFACE channel 0;
        apply $IFACE key     off;
        FILE=${SPEC##*/};
        TYPE=${FILE%:*};
        WHAT=${FILE#*:};
        echo "Reading $TYPE config ($WHAT)";
        if [ "x$TYPE" = "xESSID" ]; then apply $IFACE essid "$WHAT"; fi;
        if [ "x$TYPE" = "xMAC"   ]; then apply $IFACE ap    "$WHAT"; fi;

        egrep -v '^#' "$SPEC" | while read option value;
        do
            apply $IFACE $option $value
        done;
        break;
    fi;
done < <($IWLIST $IFACE scan | grep :)

if [ "x$CONFIGURED" = "x" ];
then
    if [ "x$FIRST_ESS" = "x" ];
    then
        echo "no config and no open networks - wild stab in the dark time";
        apply $IFACE essid   any;
        apply $IFACE ap      any;
        apply $IFACE channel 0;
        apply $IFACE key     off;
        if [ -r "$CONFDIR/default" ];
        then
            egrep -v '^#' "$CONFDIR/default" | while read option value;
            do
                apply $IFACE $option $value
            done;
        fi;
    else
        echo "no config, using open network $FIRST_ESS";
        apply $IFACE essid  "$FIRST_ESS";
        apply $IFACE ap     "$FIRST_MAC";
        apply $IFACE channel 0;
        apply $IFACE key     off;
    fi;
fi;