convert WiFi passwords from old Android wpa_supplicant.conf to newer (post-Oreo) WifiConfigStore.xml

This perl script reads old wpa_supplicant.conf on STDIN, and outputs new WifiConfigStore.xml to STDOUT

For me, upgrading LG G3 from LineageOS 14.1 (Android 7.1.2 "Nougat") to LineageOS 16.0 (Android 9 "Pie") resulted in all my wifi password being lost. The reason is the information is no longer kept in /data/misc/wifi/wpa_supplicant.conf but instead in /data/misc/wifi/WifiConfigStore.xml

This script is a quick hack to convert (most of the) passwords to new format so I don't have to remember and type them all again.

• adb root

  (make sure you have first set permissions in developer settings root ADB)

• adb pull /data/misc/wifi/wpa_supplicant.conf

  (or in whatever location it is in your device - maybe /data/wifi/bcm_supp.conf or /data/misc/wifi/wpa.conf)

• ./convert_wifi.pl < wpa_supplicant.conf > WifiConfigStore.xml

  (and check any warnings / error outputed on the screen)

• disable WiFi on your phone

• push new config on the phone (to correct location - check first where is current WifiConfigStore.xml):

adb push WifiConfigStore.xml /data/misc/wifi/WifiConfigStore.xml
adb shell chmod 600 /data/misc/wifi/WifiConfigStore.xml
adb shell chown system:system /data/misc/wifi/WifiConfigStore.xml
adb shell rm /data/misc/wifi/WifiConfigStore.xml.encrypted-checksum
adb reboot

• enable WiFi on your phone

• Never write XML by hand as I do here! It will seem to work in most cases, and then break badly on some non-escaped value or similar.
• only config I implemented currently are open networks (no PSK) and WPA2 networks (with ASCII PSK). Maybe support other (WEP, WPA1, EAP-xxx thingies) ?
• set uid to 1000 or 0 ? or -1 ?
• parse id_str (url_decode, JSON) for creatorUid & configKey ?
• where to put "priority" and "bssid" from wpa_supplicant.conf ?
• wpa_supplicant.conf: is "disabled" always "1" ?
• warn for all unhandled key/value pairs (or even better, handle them correctly)
• FIXMEs in code