# Uses wireless_tools, to check for association to a network.
# wep_check interface [timeout]
wep_check()
{
    INTERFACE=$1; TIMEOUT=$2
 
    [[ -z "$TIMEOUT" ]] && TIMEOUT=15
    let timeout=0
    while [[ $timeout -ne $TIMEOUT ]]; do
        bssid=`iwgetid $INTERFACE -ra`
        [[ ! "$bssid" = "00:00:00:00:00:00" ]] && return 0
        sleep 1
        let timeout++
    done
    
    err_append "Wireless association failed"
    return 1
}

# Check if a particular network is within range
# find_essid interface essid
find_essid()
{
    INTERFACE=$1; ESSID=$2; RETRIES=5
    try=0;
    while [[ $try -ne $RETRIES ]]; do
        if iwlist $INTERFACE scan|sed "s/ESSID://g"|grep -q "\"$ESSID\""; then
            return 0 # network found
        fi
        sleep 1
        let try++
    done
    return 1
}

# Return a filename containing a list of network ESSID's found.
# list_networks interface
list_networks()
{
    # temp file used, as keeping ESSID's with spaces in their name in arrays 
    # is hard, obscure and kinda nasty. This is simpler and clearer.
 
    [[ -z "$1" ]] && return 1
    essids=$(mktemp /tmp/essid.XXXXX)

    let try=0;
    RETRIES=6;
    while [[ $try -ne $RETRIES ]]; do        
        iwlist $1 scan 2> /dev/null|grep ESSID|sed 's/.*ESSID:"\([^"]\+\)".*/\1/' > $essids
        sleep 0.5; let try++
    done
    sort -u $essids -o $essids
  
    # File of 0 length, ie. no ssid's.
    if [[ ! -s $essids ]]; then
        return 1
    fi

    echo $essids
    return 0
}
# vim: set ts=4 et sw=4 ft=sh: