wpa_connect_v2

#!/bin/bash

[ -z "$1" -o -z "$2" ] && echo "w_iface up/last/down" && exit 0

rm .list.tmp 2>/dev/null
wpa_config="/etc/wpa_supplicant/wpa_supplicant.conf"
last_ssid=$(cat $wpa_config | grep ssid=\" | awk -F'=' '{print $2}')

case $2 in
    down)
        pkill wpa_supplicant
        dhclient $1 -x
        ifconfig $1 down
        exit 0
        ;;
    last)
        pkill wpa_supplicant
        dhclient $1 -x
        ifconfig $1 down
        ifconfig $1 up
        if [[ -z `cat /etc/network/interfaces | grep $1` ]]; then
            wpa_supplicant -B -Dwext -i $1 -c "$wpa_config"
            dhclient $1
        else
            ifup $1
        fi
        exit 0
        ;;
    up)
        pkill wpa_supplicant
        dhclient $1 -x
        #dhclient -r
        ifconfig $1 up
        iwlist $1 scan 2>/dev/null > .list.tmp
        eval list=( $(cat .list.tmp | awk -F":" '/ESSID/{print $2}' | nl -w2 -n rz -s "=") )
        #sets prompt
        PS3="Choose wifi connection: "
        #tests for number of wifi connections, exits if none
        if [[ -z "${list[0]}" ]]; then
            clear
            echo "No available wifi connection"
            exit 1
        fi
        #menu of wifi connections
        select item in "${list[@]}"; do
            cell=$(echo $item | awk -F"=" '{print $1}')
            essid=$(echo $item | awk -F"=" '{print $2}')
            echo " "
            echo "$essid: Connecting..."
            echo " "
            sed -ni "/Cell $cell/,/Cell/ p" .list.tmp
            # delete spaces
            echo "$(cat .list.tmp | sed -n 's/^[ \t]*//')"
            #sets channel as value for CHANNEL variable
            channel=$(grep Channel: .list.tmp | sed 's/.*Channel://g')
            #sets pairwise chiphers
            pairwise=$(grep -m 1 Pairwise .list.tmp | sed 's/.* : //g')
            #sets group chiphers
            group=$(grep -m 1 Group .list.tmp | sed 's/.* : //g')
            #test for mode, if mode = master, sets MODE variable to managed
            mode=$(grep Mode .list.tmp | sed 's/.*Mode://g')
            if [[ "$mode" == "Master" ]]; then
                mode="managed"
            else
                clear
                echo "Cannot connect"
                exit 1
            fi
            #tests for encryption key
            key=$(grep key: .list.tmp | sed 's/.*key://g')
            if [[ $key == "on" ]]; then
                while true; do
                    read -r -s -p "$essid: Enter password: " key
                    if [ ${#key} -lt 8 ] || [ ${#key} -gt 32 ]; then
                        echo "The password must be 8-32 characters"
                        :
                    else
                        break
                    fi
                done
            fi
            skey=$(wpa_passphrase "$essid" $key 2>/dev/null | sed -n 's/^[ \t]psk=//gp')
            #checks encryption algorithm
            IE=$(grep WPA .list.tmp | sed 's/.*: //g')
            if [[ -n "$IE" ]]; then
                echo "ctrl_interface=/var/run/wpa_supplicant
ap_scan=1
network={
ssid=\"$essid\"
scan_ssid=0
proto=WPA RSN
key_mgmt=WPA-PSK
pairwise=$pairwise
group=$group
psk=$skey
}" > "$wpa_config"
                if [[ -z `cat /etc/network/interfaces | grep $1` ]]; then
                    sudo pkill wpa_supplicant
                    sudo dhclient -r
                    sudo ifconfig $1 up
                    wpa_supplicant -B -Dwext -i $1 -c "$wpa_config" &>/dev/null
                    dhclient $1
                else
                    ifup $1
                fi
                exit 0
            else
                #sets the wireless configuration for non WPA: essid, channel, mode, key, etc
                sudo pkill wpa_supplicant
                sudo dhclient -r
                sudo ifconfig $1 up
                iwconfig $1 essid "$essid" channel $channel mode $mode key $key
                #connects to wifi connection
                dhclient $1
                exit 0
            fi
        done
        ;;
    *)
        exit 1
esac