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connect.sh

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Jun 2nd, 2013
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  1. #!/bin/bash
  2.  
  3. # http://pastebin.com/Pa90HBiU
  4. # 01/06/2013
  5. # This script attempts to semi-automate the wifi connection process from
  6. # the command line.
  7. # It is intended to be used on a headless machine without the
  8. # requirement of typing several commands for a connection.
  9. # The script stores previous connection credentials in PLAINTEXT as
  10. # *.wpa files in the executed directory and in /etc/wpasupplicant.conf.
  11. # These .wpa files are used to connect to several different ap using
  12. # previously stored info.
  13. # Probably a good idea to stop and other network managing software while
  14. # running this script, also in testing wpa_supplicant does a pretty good
  15. # job of re-connecting a disassociated link automatically.
  16. #
  17. # Mainly created from a combination of scripts taken from theses two
  18. # sources:
  19. # http://www.backtrack-linux.org/forums/archive/index.php/t-3367.html
  20. # AND
  21. # http://www.linuxquestions.org/questions/linux-general-1/wifi-connect\
  22. # -script-tested-in-ubuntu-772646/
  23. #
  24. # old version  http://pastebin.com/Pa90HBiU  01/06/2013
  25. #
  26. # Copy, Distribute and Modify Freely.
  27. #
  28.  
  29.  
  30. INT=$1
  31.  
  32. if [ -z "$1" ]; then
  33.     printf "Usage: $0 [interface]\n"
  34.     exit
  35. fi
  36.  
  37. if [ "$(id -u)" != "0" ]; then
  38.     printf "This script must be run as root\n" 1>&2
  39.     exit
  40. fi
  41.  
  42. #
  43. # Search for previous saved config files
  44. #
  45. function read_saved {
  46.     #
  47.     # Search for previous wpa configuration files.
  48.     #
  49.  
  50.     #
  51.     # Save and change IFS so spaces in file names are not interpreted as
  52.     # separate lines in the array
  53.     #
  54.     OLDIFS=$IFS
  55.     IFS=$'\n'
  56.  
  57.     #
  58.     # Read all file names into an array
  59.     # ref:http://www.cyberciti.biz/tips/handling-filenames-with-spaces\
  60.     # -in-bash.html
  61.     #
  62.     # " -printf '%f\n' " removes path info from outputs
  63.     #
  64.     # ref:http://serverfault.com/questions/354403/remove-path-from-find\
  65.     # -command-output
  66.     #
  67.     SAVED_LIST=($(find . -type f -name "*.wpa" -printf '%f\n'))
  68.  
  69.     #
  70.     # restore ifs
  71.     #
  72.     IFS=$OLDIFS
  73.  
  74.  
  75.     #
  76.     # Tests for number of saved wifi connections, if none exit
  77.     #
  78.     if [ -z "${SAVED_LIST[0]}" ]; then
  79.         printf "There are no previous saved wifi connections\n\n"
  80.         #
  81.         # Create new connection
  82.         #
  83.         conf_create
  84.     fi
  85.  
  86.     #
  87.     #PS3 Sets the prompt for the select statement below
  88.     #
  89.     PS3="Choose a previously saved wifi connection or 's' to skip: "
  90.  
  91. #
  92. #Select one of the previous saved configurations to connect with or quit
  93. #
  94. select ITEM in "${SAVED_LIST[@]}"; do
  95.     #
  96.     # Quit if selected number does not exist or alpha in entered
  97.     #
  98.     if [ -z "$ITEM" ] ; then
  99.             printf "Skipping\n"
  100.             conf_create
  101.     fi
  102.  
  103.     printf "$ITEM is selected\n"
  104.     cat "$ITEM">/etc/wpa_supplicant.conf | xargs
  105.     connect "$ITEM"
  106. done
  107. }
  108.  
  109. function conf_create (){
  110.     #
  111.     # Scans for wifi connections & isolates wifi AP name
  112.     #
  113.     eval LIST=( $(iwlist $INT scan 2>/dev/null | awk -F":" '/ESSID/{print $2}') )
  114.  
  115.     #
  116.     #PS3 Sets the prompt for the select statement below
  117.     #
  118.     PS3="Choose wifi connection or 'q' to quit: "
  119.  
  120.     #
  121.     # Tests for number of wifi connections, exits if none
  122.     #
  123.         if [ -z "${LIST[0]}" ]; then
  124.             printf "No available wifi connection using $INT\n"
  125.             exit
  126.         fi
  127.  
  128.     #
  129.     # Select from a LIST of scanned connections
  130.     #
  131.     select ITEM in "${LIST[@]}"; do
  132.     ifconfig $INT | grep inet
  133.  
  134.         #
  135.         # Quit if selected number does not exist or alpha in entered
  136.         #
  137.         if [ -z "$ITEM" ] ; then
  138.                 printf "Exiting\n"
  139.                 exit
  140.         fi
  141.  
  142.         #
  143.         # Get user input for passphrase no need to escape spaces
  144.         #
  145.         printf "Enter the passphrase for $ITEM?\n"
  146.         read "PASSPHRASE"
  147.  
  148.         #
  149.         # Append the ITEM variable (ESSID) to .wpa to make a filename
  150.         # for saved configs
  151.         #
  152.         FILENAME=$ITEM".wpa"
  153.  
  154.         #
  155.         # Run wpa_passphrase to generate a file for wpa_supplicant to
  156.         # use, store it locally and in etc/wpa_supplicant.conf
  157.         #
  158.         printf "Running wpa_passphrase\n"
  159.         wpa_passphrase "$ITEM" "$PASSPHRASE" > "$FILENAME" | xargs
  160.         cat "$FILENAME">/etc/wpa_supplicant.conf | xargs
  161.         printf "Creating new configuration using $ITEM\n"
  162.  
  163.         #
  164.         # Jump to connect function, pass on the ESSID variable for connection
  165.         #
  166.         connect $ITEM
  167.     done
  168. }
  169.  
  170. function connect (){
  171.     printf "Connecting using file $*\n"
  172.  
  173.     #
  174.     # Capture incoming argument
  175.     #
  176.     ESSID=$*
  177.  
  178.     #
  179.     # Kill previous instances of wpa_supplicant to stop other instances
  180.     # wpa_supplicant fighting several different AP's
  181.     # Kill based on
  182.     # ref: http://thegeekstuff.com/2011/10/grep-or-and-not-operators
  183.     # and
  184.     # http://stackoverflow.com/questions/3510673/find-and-kill-a-\
  185.     # process-in-one-line-using-bash-and-regex
  186.     #
  187.     # Release dhcp ip's and bring down the interface
  188.     #
  189.     kill $(ps aux | grep -E '[w]pa_supplicant.*\'$INT'' |  awk '{print $2}') 2>/dev/null | xargs
  190.     dhclient $INT -r
  191.     ifconfig $INT down
  192.  
  193.     #
  194.     # Assign new credentials to interface
  195.     #
  196.     iwconfig $INT mode managed essid "$ESSID"
  197.     printf "Configured interface $INT; ESSID is $ESSID\n"
  198.     ifconfig $INT up
  199.     printf "Interface $INT is up\n"
  200.     wpa_supplicant -B -Dwext -i$INT -c/etc/wpa_supplicant.conf 2>/dev/null | xargs
  201.     printf "wpa_supplicant running, sleeping for 15...\n"
  202.  
  203.     #
  204.     # Wait to connect before asking for a ip address
  205.     #
  206.     sleep 15
  207.     printf "Running dhclient\n"
  208.     dhclient $INT
  209.  
  210.     #
  211.     # Show current ip for interface
  212.     #
  213.     ifconfig $INT | grep inet
  214. exit
  215. }
  216.  
  217. function clean_slate (){
  218.     #
  219.     # Optional Clean Slate commands, it is recommended that you perform
  220.     # a "airmon-ng check kill" to ensure that any other network managers
  221.     # do not intefere with the connection process
  222.     #
  223.  
  224.     printf "It is recommended that you perform a \"airmon-ng check kill\" once to ensure that any other network managers do not interfere with the connection process\n"
  225.  
  226.     #
  227.     # Untested, airmon-ng check kill works better here
  228.     #
  229.     #   service network-manager stop 2>/dev/null >/dev/null
  230.     #   service avahi-daemon stop 2>/dev/null >/dev/null
  231.     #   sleep 10
  232.     #   killall wpa_supplicant 2>/dev/null
  233.     #   ifconfig $INT up
  234. }
  235.  
  236. #
  237. # Start here
  238. #
  239. clean_slate
  240. read_saved
  241.  
  242. exit
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