brianhansonxyz/vpnhotspotmod
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Handle multiple groups and other formats of psk

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This should address #17.
This commit is contained in:
Mygod
2018-05-02 01:30:29 -07:00
parent 989408accc
commit a9c40c8ff7
3 changed files with 28 additions and 20 deletions
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31
mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/P2pSupplicantConfiguration.kt
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@@ -12,16 +12,27 @@ import java.io.File
class P2pSupplicantConfiguration {
companion object {
private const val TAG = "P2pSupplicationConf"
// format for ssid is much more complicated, therefore we are only trying to find the line
/**
* Format for ssid is much more complicated, therefore we are only trying to find the line and rely on
* Android's results instead.
*
* Source: https://android.googlesource.com/platform/external/wpa_supplicant_8/+/2933359/src/utils/common.c#631
*/
private val ssidMatcher = "^[\\r\\t ]*ssid=".toRegex()
private val pskParser = "^[\\r\\t ]*psk=\"(.*)\"\$".toRegex(RegexOption.MULTILINE)
/**
* PSK parser can be found here: https://android.googlesource.com/platform/external/wpa_supplicant_8/+/d2986c2/wpa_supplicant/config.c#448
*/
private val pskParser = "^[\\r\\t ]*psk=(ext:|\"(.*)\"|\"(.*)|[0-9a-fA-F]{64})".toRegex(RegexOption.MULTILINE)
}
private val content by lazy { loggerSu("cat /data/misc/wifi/p2p_supplicant.conf") }
fun readPsk(): String? {
return try {
pskParser.findAll(content ?: return null).single().groupValues[1]
val match = pskParser.findAll(content ?: return null).single()
val result = match.groupValues[2] + match.groupValues[3] // only one will match and hold non-empty value
check(result.length in 8..63)
result
} catch (e: RuntimeException) {
Log.w(TAG, content)
e.printStackTrace()
@@ -34,26 +45,24 @@ class P2pSupplicantConfiguration {
val content = content ?: return null
val tempFile = File.createTempFile("vpnhotspot-", ".conf", app.cacheDir)
try {
var ssidFound = false
var pskFound = false
var ssidFound = 0
var pskFound = 0
tempFile.printWriter().use {
for (line in content.lineSequence()) it.println(when {
ssidMatcher.containsMatchIn(line) -> {
ssidFound = true
ssidFound += 1
"\tssid=" + config.SSID.toByteArray()
.joinToString("") { it.toInt().toString(16).padStart(2, '0') }
}
pskParser.containsMatchIn(line) -> {
pskFound = true
pskFound += 1
"\tpsk=\"${config.preSharedKey}\"" // no control chars or weird stuff
}
else -> line // do nothing
})
}
if (!ssidFound || !pskFound) {
Log.w(TAG, "Invalid conf ($ssidFound, $pskFound): $content")
return false
}
if (ssidFound != 1 || pskFound != 1) Log.w(TAG, "Invalid conf ($ssidFound, $pskFound): $content")
if (ssidFound == 0 || pskFound == 0) return false
// pkill not available on Lollipop. Source: https://android.googlesource.com/platform/system/core/+/master/shell_and_utilities/README.md
return noisySu("cat ${tempFile.absolutePath} > /data/misc/wifi/p2p_supplicant.conf",
if (Build.VERSION.SDK_INT >= 23) "pkill wpa_supplicant"