Configure wlan card under OpenBSD

network

#!/bin/sh

if=$1

MUTEX=/tmp/network_config.$if

if [ -f $MUTEX ]
then
  echo "Wireless config for $if already in progress"
  exit
fi

wlan_active=$(ifconfig $if | grep "status: active" | wc -l | tr -d ' ')
if [ ${wlan_active:-1} -eq 0 ]
then
  touch $MUTEX
  trap 'rm -f $MUTEX; exit 1' 0 HUP INT TERM

  echo "$if not connected, search for known wireless network..."
  ifconfig $if down > /dev/null
  scand=$(ifconfig $if scan | grep -v ieee80211 | grep nwid | tr -d '\t' | sed -E 's#^nwid (.*) chan.*#\1#' | sort -u)
  nwids=$(cat /etc/nwid.conf | sed -E 's#^nwid (.*) wpakey.*#\1#')

  OLD_IFS=$IFS
  # set IFS to a single return character
  IFS='
'
  found=0
  # look for matches in order the nwids were set in the file
  for i in $nwids
  do
    if [ found -eq 1 ]
    then
      break
    fi
    for j in $scand
    do
      if [ $i = $j ]
      then
        echo "Known wireless network found ($i), connecting..."
        config=$(cat /etc/nwid.conf | grep $i)
        # eval to ensure quoted text is handled
        eval ifconfig $if $config up
        ifconfig $if | grep status
        dhclient $if
        found=1
        break
      fi
    done
  done
  IFS=$OLD_IFS
else
  echo "$if already connected and active"
fi