Neo FreeRunner Wifi

Revision as of 06:33, 1 August 2008

What APs are available

root@om-gta02:~# iwlist eth0 scan

Using WPA and /etc/network/interfaces

Once you have a /etc/wpa_supplicant/wpa_supplicant.conf file, add a line under the eth0 entry in /etc/network/interfaces:

iface eth0 inet dhcp
   wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

Save your changes and run:

 # ifdown eth0 && ifup eth0

You'll get a lot of messages, like ioctl[SIOCSIWENCODEEXT]: Operation not supported and sed: unrecognized option `--quiet', they appear to be harmless. The "--quiet" error message can be avoided by replacing "sed --quiet" with "sed -n" in /etc/wpa_supplicant/*.sh

Using WEP and /etc/network/interfaces

 iface eth0 inet dhcp
   wireless-key my_wep_key
   wireless-essid my_essid

iface eth0 inet dhcp
   wpa-wep-key0 my_wep_key
   wpa-key-mgmt NONE
   wpa-ssid my_essid

Save your changes and run:

 # ifdown eth0 && ifup eth0

Manual attempt

Create and edit a suitable /etc/wpa_supplicant/wpa_supplicant.conf

root@om-gta02:~# ifup eth0
root@om-gta02:~# wpa_supplicant -ieth0 -c/etc/wpa_supplicant/wpa_supplicant.conf -B
root@om-gta02:~# udhcpc eth0

Sample wpa_supplicant.conf

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
eapol_version=1
ap_scan=1
fast_reauth=1 
# WPA2:
network={
       ssid="your ssid"
       scan_ssid=1
       proto=RSN
       key_mgmt=WPA-PSK
       pairwise=CCMP TKIP
       group=TKIP CCMP
       psk="secret key"
       priority=50
}

# WPA:
network={
      ssid="your_ssid"
      proto=WPA
      key_mgmt=WPA-PSK
      pairwise=TKIP
      group=TKIP
      scan_ssid=1
      psk="secret key"
      priority=10
}

# WEP:
network={
     ssid="your_ssid"
     scan_ssid=1
     key_mgmt=NONE
     wep_tx_keyidx=0
     wep_key0=your_hex_key
     priority=8
}

# Open:
network={
     ssid="your ssid"
     key_mgmt=NONE
     priority=5
}

wpa_supplicant.conf explained

The highest priority is tried first then falls back to the next highest number.

priority=100 1st
then
priority=99

 

# Simple case: WPA-PSK, PSK as an ASCII passphrase, allow all valid ciphers
network={
	ssid="AP_ESSID"
	psk="presharedkey"
	priority=5
}


#try open AP regardless of its SSID.
# change root password before you go roaming around it could prove dangerous
network={
	key_mgmt=NONE
priority=1  #try any open AP last
}

A more in depth explanation can be found here:
http://hostap.epitest.fi/gitweb/gitweb.cgi?p=hostap.git;a=blob_plain;f=wpa_supplicant/wpa_supplicant.conf

A very ugly /etc/init.d/wlan startscript

#!/bin/sh
#
# wlan	This shell script starts and stops wlan.
#
# processname: wlan

# Source function library.
#. /etc/rc.d/init.d/functions
# "written" by HdR

RETVAL=0
prog="wlan"

# test -f /etc/default/$prog && . /etc/default/$prog

start() {
	echo -n "Starting $prog: "
	ifconfig eth0 up
	wpa_supplicant -ieth0 -c/etc/wpa_supplicant/wpa_supplicant.conf -B
	sleep 10
	udhcpc eth0
	RETVAL=$?
	return $RETVAL
}

stop() {
	# Stop daemons.
	echo -n "Shutting down $prog: "
        killall wpa_supplicant
	ifconfig eth0 down
#        killproc gpsd
	RETVAL=$?
	return $RETVAL
}

# See how we were called.
case "$1" in
  start)
	start
	;;
  stop)
	stop
	;;
  restart|reload)
	stop
	start
	RETVAL=$?
	;;
  *)
	echo "Usage: $0 {start|stop|restart}"
	exit 1
esac

exit $RETVAL

Available Software

Here are some applications available to aid in WiFi administration:

lint-wifi

lint-wifi work in progress
http://wiki.openmoko.org/wiki/Lint-wifi

Mofi

Mofi is software for the OpenMoko platform allowing phone users to search for and connect to wireless access points within range.

• download ipk (installation notes)
• more info