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February 24, 2024 10:00
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Shell script that loads the WPA_supplicant configuration and use it to connect to available networks, if none is available it an AP is created. Include Wi-Fi watchdog service that checks that the connection is always working.
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| #!/bin/bash | |
| WPA_SUPPLICANT_CONF="/etc/wpa_supplicant/wpa_supplicant.conf" | |
| # this funcion is called once the connection is established, | |
| # in this case a boot sound will be played to notify the user that everything is ready. | |
| function connected { | |
| aplay /root/Windows3.1.wav 2>&1 >/dev/null & | |
| } | |
| # function that tries to establish a connection, get a network in $temp from the WPA file | |
| # and then goes through all available networks ($essid) to find a match. | |
| function testConnect { | |
| while [ $x -lt ${#essid[@]} ]; do | |
| if [ "${temp[ssid]}" = "${essid[$x]}" ] | |
| then | |
| echo "Trying to connect to ${temp[ssid]}" | |
| ssid="${temp[ssid]}" | |
| ssid="${ssid%\"}" | |
| ssid="${ssid#\"}" | |
| iwconfig wlan0 essid "$ssid" | |
| dhclient wlan0 | |
| connected | |
| exit | |
| fi | |
| (( x++ )) | |
| done | |
| } | |
| a=0 | |
| b=0 | |
| x=0 | |
| declare -a essid | |
| declare -a address | |
| # load in $essid and $address all available networks | |
| while read line | |
| do | |
| case $line in | |
| *ESSID* ) | |
| line=${line#*ESSID:} | |
| essid[$a]="$line" | |
| a=$((a + 1)) | |
| ;; | |
| *Address*) | |
| line=${line#*Address:} | |
| address[$b]="$line" | |
| b=$((b + 1)) | |
| ;; | |
| esac | |
| done < <(iwlist wlan0 scanning) | |
| #load in $temp a network at time from the WPA supplicant file | |
| declare -A temp | |
| i=0 | |
| flag=0 | |
| while read line | |
| do | |
| case "$line" in | |
| "network={") | |
| flag=1 | |
| ;; | |
| "}") | |
| #echo "${temp[*]}" | |
| testConnect temp[@] | |
| ((i++)) | |
| flag=0 | |
| ;; | |
| *) | |
| if [ "$flag" -eq 1 ]; then | |
| IFS='=' read -a array <<< "$line" | |
| key="${array[0]}" | |
| temp[$key]="${array[1]}" | |
| fi | |
| esac | |
| done < $WPA_SUPPLICANT_CONF | |
| # if a connection hasn't been established create an hotspot | |
| if ifconfig wlan0 | grep -q "inet addr:" ; then | |
| echo "Already Connected" | |
| # start the watchdog service | |
| service wifi_watchdog start | |
| connected | |
| else | |
| #we don't know if the watchdog service is running so stop it 'cause I haven't test it yet | |
| service wifi_watchdog stop | |
| echo "Network connection down! Inizializing hotspot:" | |
| # set a static IP | |
| ifconfig wlan0 192.168.0.1 netmask 255.255.255.0 | |
| # inizialize hotspot | |
| hostapd -B -dd /etc/hostapd/hostapd.conf | |
| # start dhcp | |
| service udhcpd start | |
| connected | |
| fi |
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