#!/bin/sh
# rc.wirelesslan
# Wireless LAN connection script
#
# 20050718 v1.0
# Miguel Melendez (miguelmmg at yahoo com mx)
#
# TO-DO:
# * Connect to any ESSID without WEP
# * Connect ESSID by priority
#
# Aditional notes:
# My english is terrible, forgive my mistakes.
# The original script is in spanish if you want it.
# El script original este en idioma espaniol por si alguien lo desea.

# Wireless LAN interface
IF="wlan0"
DHCPHOSTNAME="movil"

# WLAN Card Options
MODE="Managed"

# WEP keys. Put your own key's like: KEY_<your known ESSID>="wepkey"
# Note: These are not real ESSID's and WEP keys. :D 
KEY_2WIRE222="2EA9180813"
KEY_wLAN2="FE14024FA2"
KEY_home="473AC30230"
KEY_Work="D3ACCC8579"

case "$1" in
    'stop')
    if (/sbin/ifconfig | grep -q -w $IF); then
        /sbin/dhcpcd -k $IF
        /sbin/iwconfig $IF essid any
    fi
    ;;

    'start')
    # Array and numbrer of available ESSIDs
    ESSIDs=($(/sbin/iwlist $IF scanning | grep ESSID | cut -d\" -f2))
    nESSID=${#ESSIDs[@]}

    if (/sbin/ifconfig | grep -q -w $IF); then
        echo "A Wireless LAN conection is already active in $IF"
        exit
    fi

    if (( nESSID == 0 )); then
        echo "No ESSID's available in this place"
    else
        # Try to make a link to available ESSID's
        for (( i=0; i < nESSID; i++)) do
            echo -n "Wireless LAN ${ESSIDs[$i]}: "
            # Search ESSID's WEP key
            keyESSID="KEY_${ESSIDs[$i]}"
            WEPKEY=${!keyESSID}
            if [ -z "$WEPKEY" ]; then
                echo "no WEP key configured"
            else
                if [ -z "$WIRELESSLAN" ]; then
                    /sbin/iwconfig $IF mode ${MODE}
                    /sbin/iwconfig $IF essid ${ESSIDs[$i]}
                    /sbin/iwconfig $IF encryption ${WEPKEY}
                    # Little delay waiting link completed
                    sleep 5
                    if (/sbin/iwconfig $IF | grep -q ${ESSIDs[$i]}); then
                        WIRELESSLAN="OK"
                        echo -n "linked to AP"
                        if (/sbin/dhcpcd -h $DHCPHOSTNAME $IF); then
                            echo " and IP address assigned"
                        else
                            echo " but no response from DHCP server"
                        fi
                    else
                        echo "error"
                    fi
                else
                    echo "available"
                fi
            fi
        done
    fi
    ;;

    *)
    echo "Usage: $0 start|stop"
esac