scripts/openwrt/choose_wifi.sh

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2020-03-01 13:02:34 +01:00
#! /bin/sh
###################################################################################
# Choose and enable wifi-interface with uci
# Usage: choose_wifi.sh [ssid]
# when argument is passed, script tries to activate wifi interface with that ssid
# else script tries to activate first match from iwlist scanning results
#
# author: Christian Ulrich
# version: 0.1
###################################################################################
# function search_ssid( ssid, number_of_ifaces )
#################################################
search_ssid(){
found=false
current=0
index_to_return=0
while [ $found = false -a $current -lt $2 ]
do
uci_result=`uci get wireless.@wifi-iface[$current].ssid 2>&1`
if [ $uci_result = $1 ]; then
index_to_return=`expr $current + 1`
found=true
fi
current=`expr $current + 1` #increment counter
done
return $index_to_return
}
# Count interfaces in /etc/config/wireless (result in $iface_counter)
# and check if any of them is enabled
######################################################################
uci_result="0"
value_exists=true
iface_counter=0
enabled_iface_exists=false
while [ $value_exists = true ]
do
uci_result=`uci get wireless.@wifi-iface[$iface_counter].ssid 2>&1`
if [ $? -eq 0 ]; then
#iface_counter=`expr $iface_counter + 1` #increment iface_counter
#uci_result=`uci get wireless.@wifi-iface[$iface_counter].disabled 2>/dev/null`
if [ `uci get wireless.@wifi-iface[$iface_counter].disabled 2>/dev/null` = 0 ]; then
enabled_iface_exists=true
fi
iface_counter=`expr $iface_counter + 1` #increment iface_counter
else
value_exists=false
fi
done
# Get Wifi interface
#####################
#wifi_iface=$(cat /proc/net/wireless | grep : )
#wifi_iface=$(echo $wifi_iface | cut -c1-$(expr $(expr index "$wifi_iface" :) - 1 ))
# Check commandline options and start searching
################################################
if [ $# -eq 0 ]; then
if [ $enabled_iface_exists = false ]; then # if no interface is enabled, enable first one
uci set wireless.@wifi-iface[0].disabled=0
/etc/init.d/network reload
sleep 1
fi
#scan_result=`iwlist ${wifi_iface} scanning | grep ESSID`
scan_result=`iwlist scanning 2>/dev/null | grep ESSID`
if [ $? -eq 1 ]; then
sleep 1
scan_result=`iwlist scanning 2>/dev/null | grep ESSID`
fi
#echo ${scan_result[1]}
scan_result=`echo $scan_result | tr -d 'ESSID:"'`
#scan_result=`echo $scan_result | tr -d '" '`
index_of_ssid_to_activate=0
for j in $scan_result
do
if [ $index_of_ssid_to_activate -eq 0 ]; then
search_ssid $j $iface_counter
index_of_ssid_to_activate=$?
if [ $index_of_ssid_to_activate -ne 0 ]; then
#ssid=$j
break
fi
fi
done
elif [ $# -eq 1 ]; then
index_of_ssid_to_activate=0
search_ssid $1 $iface_counter
index_of_ssid_to_activate=$?
else
echo "usage: choose_wifi.sh [ssid]"
exit 1
fi
# Evaluate results and enable the right interface with uci
###########################################################
if [ $index_of_ssid_to_activate -eq 0 ]; then
echo "Network with SSID ${1} not defined in /etc/config/wireless."
exit 1
fi
i=1
while [ $i -le $iface_counter ]
do
if [ $i -eq $index_of_ssid_to_activate ]; then
uci set wireless.@wifi-iface[`expr $i - 1`].disabled=0
ssid=$(uci get wireless.@wifi-iface[`expr $i - 1`].ssid)
else
uci set wireless.@wifi-iface[`expr $i - 1`].disabled=1
fi
i=`expr $i + 1`
done
# Activate interface
##########################################
echo "Activating wifi-interface ${ssid}..."
/etc/init.d/network reload