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#! /bin/bash
# Uses wpa_supplicant to check for association to a network
# wpa_check interface [timeout]
wpa_check()
{
INTERFACE=$1; TIMEOUT=$2
[ -z $TIMEOUT ] && TIMEOUT=15
let timeout=0
while [ $timeout -ne $TIMEOUT ]; do
eval `wpa_cli status|grep wpa_state`
[ "$wpa_state" = "COMPLETED" ] && return 0
sleep 1
let timeout++
done
wpa_cli terminate >/dev/null 2>&1
err "Wireless association failed."
return 1
}
# 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 "Wireless association failed."
return 1
}
# Check if a particular network is within range
# find_essid interface essid
find_essid()
{
INTERFACE=$1; ESSID=$2; RETRIES=4
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 0.5
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;
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
}
start_wpa()
{
INTERFACE=$1; WPA_CONF=$2; WPA_OPTS=$3
[ "$WPA_OPTS" == "" ] && WPA_OPTS="-Dwext"
wpa_supplicant -wB -P/var/run/wpa_supplicant_${INTERFACE}.pid -i${INTERFACE} -c $WPA_CONF $WPA_OPTS
sleep 1
if [ ! -f /var/run/wpa_supplicant_${INTERFACE}.pid ]; then
err "wpa_supplicant did not start, possible configuration error"
return 1
fi
}
wireless_up() {
load_profile $1
if [ ! -d /sys/class/net/$INTERFACE/wireless ]; then
err "Interface $INTERFACE is not a wireless interface"
return 1
fi
# Was required by broadcom
# iwlist $INTERFACE scan &> /dev/null
# Required by atheros to enable device
ifconfig $INTERFACE up
# Required by ipw3945 to properly re-associate
eval "iwconfig $INTERFACE mode managed essid \"$ESSID\""
# Kill any lingering wpa_supplicants.
if [ -f /var/run/wpa_supplicant_$INTERFACE.pid ]; then
kill $(cat /var/run/wpa_supplicant_$INTERFACE.pid)
fi
if checkyesno $SCAN; then
if ! find_essid $INTERFACE "$ESSID"; then
err "Network unavailable"
return 1
fi
fi
case $SECURITY in
wep|none)
# 'none' security uses iwconfig, like wep, so use same code, minus keysetting.
# Use sane default if no alternative is specified
if [ "$SECURITY" = "wep" -a "$WEP_OPTS" = "" ]; then
WEP_OPTS="mode managed essid \"$ESSID\" key open $KEY"
elif [ "$SECURITY" = "none" -a "$WEP_OPTS" = "" ]; then
WEP_OPTS="mode managed essid \"$ESSID\""
fi
if ! eval iwconfig $INTERFACE $WEP_OPTS; then
err "Could not set wireless configuration"
return 1
fi
wep_check $INTERFACE $TIMEOUT|| return 1
;;
wpa)
local WPA_CONF=`mktemp /tmp/wpa.XXXXXXXX`
# Temporary bugfix for broken drivers... http://bbs.archlinux.org/viewtopic.php?id=36384
if ! eval iwconfig $INTERFACE mode managed essid "\"$ESSID\""; then
err "Could not set wireless configuration"
return 1
fi
# Create a random file to store configuration, make it root only.
chmod 600 $WPA_CONF
echo "ctrl_interface=/var/run/wpa_supplicant" >> $WPA_CONF
echo "ctrl_interface_group=0" >> $WPA_CONF
# Generate configuration
if ! wpa_passphrase "$ESSID" "$KEY" >> $WPA_CONF; then
err "Configuration generation failed: `cat $WPA_CONF`"
return 1
fi
# Connect!
start_wpa $INTERFACE $WPA_CONF $WPA_OPTS || return 1
wpa_check $INTERFACE $TIMEOUT || return 1
;;
wpa-config)
# If user hasnt defined one, use stock config.
[ -z "$WPA_CONF" ] && WPA_CONF="/etc/wpa_supplicant.conf"
start_wpa $INTERFACE $WPA_CONF $WPA_OPTS || return 1
wpa_check $INTERFACE $TIMEOUT || return 1
;;
esac
. $SUBR_DIR/ethernet.subr
if ! ethernet_up $1; then
wireless_down $1 YES
return 1
fi
}
wireless_down() {
PROFILE=$1 NOETHERNETDOWN=$2
if ! checkyesno $2; then
. $SUBR_DIR/ethernet.subr
ethernet_down $1
fi
wpa_cli terminate &> /dev/null
iwconfig $INTERFACE essid off key off &> /dev/null
ifconfig $INTERFACE down
}
wireless_clean_scope() {
unset INTERFACE CONNECTION
unset TIMEOUT WPA_CONF WPA_OPTS KEY ESSID SECURITY WEP_OPTS
. $SUBR_DIR/ethernet.subr
ethernet_clean_scope
}
# vim: set ts=4 et sw=4:
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