[SCRIPT] Wifi: impossible d'obtenir un wlan0

#!/bin/sh

# description: This startup script configures the Livebox's USB wifi dongle

if [ -f /etc/sysconfig/livebox ];then
    source /etc/sysconfig/livebox
fi

PIDFILE=/etc/dhcpc/dhcpcd-$WLAN.pid

. /etc/rc.d/init.d/functions

function get_ip() {
  ip_wlan=$(ifconfig $WLAN 2>&1 \
            | grep "inet adr:" \
       | cut -d' ' -f 12 | cut -d':' -f 2)
  if [ "$ip_wlan" = "127.0.0.1" ]; then
    unset ip_wlan
  fi
}

function wifistart() {
  # test if already started
  unset ip_wlan
  get_ip
  if [ "x$ip_wlan" != "x" ]; then
    echo "Wifi already started!"
    exit 0
  fi
  # make sure dhcpcd is stopped
  if [ -s $PIDFILE ] \
    && ps aux | cut -b10-15 | grep -q `cat $PIDFILE`; then
    kill -SIGTERM `cat $PIDFILE` 2>&1 >/dev/null
  fi
  rm -rf $PIDFILE 2>&1 >/dev/null
  action "Lancement de NDISWrapper" \
    modprobe ndiswrapper
  action "Lancement du wifi Livebox" \
    iwconfig $WLAN mode managed essid $ESSID key $WEP
  action "Obtention d'une adresse IP avec DHCP" \
    /sbin/dhcpcd wlan0
  get_ip
  echo "Adresse IP : $ip_wlan"
}

function wifistop() {
  action "Arrêt du wifi Livebox" \
    ifconfig $WLAN down
  action "Arrêt de NDISWrapper" \
    rmmod ndiswrapper
  if [ -s $PIDFILE ] \
    && ps aux|cut -b10-15|grep -q `cat $PIDFILE`; then
    action "Arrêt de dhcpcd" \
      kill -SIGTERM `cat $PIDFILE`
  fi
  rm -rf $PIDFILE 2>&1 >/dev/null
}

case $1 in
  start)
    wifistart
    exit 0
    ;;
  stop)
    wifistop
    exit 0
    ;;
  status)
    if fgrep -q ndiswrapper /proc/modules; then
      gprintf "NDISWrapper loaded."
      echo
    else
      gprintf "NDISWrapper not loaded."
      echo
    fi
    if ifconfig 2>&1 | grep -q $WLAN; then
      gprintf "$WLAN wireless interface loaded."
      echo
    else
      gprintf "$WLAN wireless interface not loaded."
      echo
    fi
    unset ip_wlan
    get_ip
    if [ "x$ip_wlan" = "x" ]; then
      gprintf "No IP address"
      echo
    else
      gprintf "IP Adress: $ip_wlan"
      echo
    fi
    exit 0
    ;;
  restart)
    ;;
  reload)
    $0 stop
    $0 start
    exit 0
    ;;
  *)
    gprintf "Usage: %s\n" "$(basename $0) {start|stop|restart|status}"
    exit 0
  ;;
esac

exit 0