TU/e MetaForum WiFi enabler/disabler

mfwifi

#!/bin/bash

#                   TU/e MetaForum WiFi enabler/disabler
#                           By Chris Mavrakis
#
# Usage:
# sudo mfwifi [enable|disable|setup]
#
#   setup should be run only once, the first time. It asks for TU/e credentials,
#          does not send them back to me, and creates the appropriate files in /etc/network
#
#   enable stops network-manager, kills the dhcp client tha may be running, and enables 
#          the custom TU/e network configuration
#
#   disable does the opposite of enable. Bring everything back to normal so you can connect
#           to "normal" networks outside TU/e
#
#
# If no option is given, user will be queried
#
# I know it could be cleaner, and some of the killalls may be unnecessary, 
# and that more checks should be done but that's all the time I want to 
# spend right now. If you want to improve it let me know, we can setup a
# repo and you can commit changes.

export PATH=$PATH:/bin:/usr/bin:/usr/local/bin

# Log file to use:
log=/tmp/metaforum_wifi_switcher.log


# Stage 1 - Parse input, or ask for some if none was given

if [[ $1 == "enable" ]]; then
  sel=1
elif  [[ $1 == "disable" ]]; then
  sel=2
elif [[ $1 == "setup" ]]; then
  sel=3
else
  echo -e "\nTU/e MetaForum WiFi enabler/disabler\n"
  echo "No option provided. What do you want to do?"
  echo "1. Enable MF wifi (for when you are at TU/e)"
  echo "2. Disable MF wifi (for when you go home)"
  echo "3. Setup (for the first time)"
  echo -e "4. Exit\n"
  while true; do
    read -p "Selection? " response
    case $response in
      [1]* ) sel=1; break;;
      [2]* ) sel=2; break;;
      [3]* ) sel=3; break;;
      [4]* ) exit;;
      * ) echo "Please just give a number.";;
    esac
  done
fi


# Part 2 - Decide what to do, depending on input that we should now have


if [[ $sel == 1 ]]; then
  # User selected the enable option
  echo "Will now Enable MF wifi. Please wait..."
  echo "*** "`date`": Starting MF wifi enabling function" &>> $log
  service network-manager stop &>> $log
  killall dhclient  &>> $log
  cp /etc/network/interfaces.manual /etc/network/interfaces
  ifdown wlan0  &>> $log
  ifup wlan0 &>> $log
  echo "Done! Will now check for internet connection..."
  echo "*** Enabling done"  &>> $log
  pkt=`ping 4.2.2.2 -c5 |grep "packet loss" | awk '{print $4}'`
  if [[ $pkt == 5 ]]; then
    echo "Excellent internet connection! 5/5"
  elif [[ $pkt > 2 ]]; then
    echo "Internet connection OK, $pkt/5"
  elif [[ $pkt > 0 ]]; then
    echo "Bad internet connection, $pkt/5"
  else
    echo "No internet connection"
  fi

elif  [[ $sel == 2 ]]; then
  # User selected the disable option
  echo "Will now Disable MF wifi."
  echo "*** "`date`": Starting MF wifi disabling function" &>> $log
  ifdown wlan0 &>> $log
  killall dhclient &>> $log
  cp /etc/network/interfaces.default /etc/network/interfaces
  service network-manager start &>> $log
  echo "Done!"
  echo "*** Disabling done" &>> $log

elif [[ $sel == 3 ]]; then
  # User selected the setup option
  while true; do
  read -p "Are you sure you want to do initial setup? [y/n] " yn
  case $yn in
    [Yy]* ) 
      cp /etc/network/interfaces /etc/network/interfaces.default # backup original file
      cp /etc/network/interfaces /etc/network/interfaces.manual # make a copy for us to work with, too
      read -p "Your TU/e username? " usr
      read -s -p "Your TU/e password? (I won't tell anyone!) " psw
      # add the magic ingredients to the interfaces file
      echo "# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

auto wlan0
iface wlan0 inet dhcp
wireless-mode Managed
wpa-ssid tue-wpa2
wpa-ap-scan 1
wpa-proto RSN WPA
wpa-pairwise CCMP AES 
wpa-group CCMP AES
wpa-key-mgmt WPA-EAP
wpa-eap PEAP
wpa-identity $usr
wpa-password $psw
wpa-phase1 fast_provisioning=1" > /etc/network/interfaces.manual

      echo -e "\nInstallation completed! Re-run script to enable MF wifi."
      break;;
        
      [Nn]* ) 
        echo "Aborted setup. Exiting..."
        exit;;
      * ) echo "Please answer yes or no.";;
    esac
  done
else
  echo "Why the hell are we here? Generic error, system malfunction, blue screen..."
fi