Author: jgamblin

My view on my run in Madison today.

At Derbycon I picked up a Minipwner and have been spending the last few days playing with it and came up with a few awesome scripts that if you have one you need to install all your device if you have one.

The First one is a wireless picker script that I found and edited from here. 

killall -9 wpa_supplicant
iwlist wlan0 scanning > /tmp/wifiscan #save scan results to a temp file
scan_ok=$(grep “wlan” /tmp/wifiscan) #check if the scanning was ok with wlan0
if [ -z “$scan_ok” ]; then
    killall -9 wpa_supplicant
    iwlist wlan0-1 scanning > /tmp/wifiscan
fi
scan_ok=$(grep “wlan” /tmp/wifiscan) #check if the scanning was ok
if [ -z “$scan_ok” ]; then #if scan was not ok, finish the script
    echo -n “
WIFI scanning failed.

”
    exit
fi
if [ -f /tmp/ssids ]; then
    rm /tmp/ssids
fi
n_results=$(grep -c “ESSID:” /tmp/wifiscan) #save number of scanned cell
i=1
while [ “$i” -le “$n_results” ]; do
        if [ $i -lt 10 ]; then
                cell=$(echo “Cell 0$i – Address:”)
        else
                cell=$(echo “Cell $i – Address:”)
        fi
        j=`expr $i + 1`
        if [ $j -lt 10 ]; then
                nextcell=$(echo “Cell 0$j – Address:”)
        else
                nextcell=$(echo “Cell $j – Address:”)
        fi
        awk -v v1=“$cell” ’$0 ~ v1 {p=1}p’ /tmp/wifiscan | awk -v v2=“$nextcell” ’$0 ~ v2 {exit}1’ > /tmp/onecell #store only one cell info in a temp file
        onessid=$(grep “ESSID:” /tmp/onecell | awk ’{ sub(/^[ t]+/, “”); print }’ | awk ’{gsub(“ESSID:”, “”);print}’)
        oneencryption=$(grep “Encryption key:” /tmp/onecell | awk ’{ sub(/^[ t]+/, “”); print }’ | awk ’{gsub(“Encryption key:on”, “(secure)”);print}’ | awk ’{gsub(“Encryption key:off”, “(open)  ”);print}’)
        onepower=$(grep “Quality=” /tmp/onecell | awk ’{ sub(/^[ t]+/, “”); print }’ | awk ’{gsub(“Quality=”, “”);print}’ | awk -F ’/70’ ’{print $1}’)
        onepower=$(awk -v v3=$onepower ‘BEGIN{ print v3 / 14}’)
        onepower=${onepower:0:3}
        onepower=“(Signal strength: $onepower of 5)”
        echo “$onessid    $oneencryption $onepower” >> /tmp/ssids
        i=`expr $i + 1`
done
rm /tmp/onecell
awk ’{printf(“%5d : %sn”, NR,$0)}’ /tmp/ssids > /tmp/sec_ssids #add numbers at beginning of line
grep ESSID /tmp/wifiscan | awk ’{ sub(/^[ t]+/, “”); print }’ | awk ’{printf(“%5d : %sn”, NR,$0)}’ | awk ’{gsub(“ESSID:”, “”);print}’ > /tmp/ssids #generate file with only numbers and names
echo -n “Available WIFI networks:
”
cat /tmp/sec_ssids #show ssids list
echo -n “Enter the numeric option for your selected network: ”
read nsel
pattern=$(echo “ $nsel : ”)
wifissid=$(grep “$pattern” /tmp/ssids)
wifissid=$(echo “$wifissid” | awk -v pat=“$pattern” ’{gsub(pat, “”);print}’ | awk ’{ sub(/^[ t]+/, “”); print }’)
wifissid=${wifissid:1:`expr ${#wifissid} – 2`}  #several commands to get clean name of ssid
if [ $nsel -lt 10 ]; then
    cell=$(echo “Cell 0$nsel – Address:”)
else
    cell=$(echo “Cell $nsel – Address:”)
fi
nextsel=`expr $nsel + 1`
if [ $nextsel -lt 10 ]; then
    nextcell=$(echo “Cell 0$nextsel – Address:”)
else
    nextcell=$(echo “Cell $nextsel – Address:”)
fi
awk -v v1=“$cell” ’$0 ~ v1 {p=1}p’ /tmp/wifiscan | awk -v v2=“$nextcell” ’$0 ~ v2 {exit}1’ > /tmp/cellinfo0 #store only the selected cell info in a temp file
grep -v ESSID /tmp/cellinfo0 > /tmp/cellinfo # delete ESSID line to avoid later grep mistakes
rm /tmp/cellinfo0
wifichannel=$(grep “ Channel:” /tmp/cellinfo)
wifichannel=$(echo “$wifichannel” | awk ’{gsub(“ Channel:”, “”);print}’ | awk ’{ sub(/^[ t]+/, “”); print }’) #get clean wifi channel
wifimode=$(grep “ WEP” /tmp/cellinfo) #check if encryption mode is WEP
if [ -n “$wifimode” ]; then   #check if $wifimode is not an empty string
    wifimode=“wep”
else
    wifimode=$(grep “WPA2 ” /tmp/cellinfo) #check if encryption mode is WPA2
    if [ -n “$wifimode” ]; then
        wifimode=“psk2”
    else
        wifimode=$(grep “WPA ” /tmp/cellinfo) #check if encryption mode is WPA
        if [ -n “$wifimode” ]; then
            wifimode=“psk”
        else
            wifimode=“none”
        fi
    fi
fi
if [ “$wifimode” != “none” ]; then #ask for passwork when needed
    echo -n “Enter password of the selected WIFI network: ”
    read wifipass
fi
rm /tmp/cellinfo
rm /tmp/ssids
rm /tmp/sec_ssids
rm /tmp/wifiscan
#write results in the wireless config file and reset wifi interface
uci set wireless.@wifi-device[0].channel=$wifichannel
uci set wireless.@wifi-iface[0].ssid=“$wifissid”
uci set wireless.@wifi-iface[0].encryption=$wifimode
uci set wireless.@wifi-iface[0].key=$wifipass
uci commit wireless
echo -n “

Trying to connect to WIFI network.
(Wait a few seconds and check status with: iwconfig )

”
wifi down
wifi0

The Second script is a reverse SSH Script that will allow you to connect to your Minipwner from anywhere on the net.

set -x

TARGET_HOST=ec2-XX-XX-XX-XX.compute-1.amazonaws.com
if test -n “${2}”
then
    TARGET_PORT=${2}
else
    TARGET_PORT=1111
fi
TARGET_USER=’UserName’

while true
do
    echo “establishing reverse ssh tunnel to ${TARGET_HOST}:${TARGET_PORT}”
    ssh -R ${TARGET_PORT}:localhost:22 -N ${TARGET_HOST} -l ${TARGET_USER} -o ServerAliveInterval=30
    sleep 1
done

Yes this is super geeky but I just wanted to have them somewhere I could find them.