Add getWifiNetworkDetails() for SSID, IP, and MAC address

Expose a new getWifiNetworkDetails() JNI method that returns the current
WiFi network's SSID, IP address, and MAC address as a newline-separated
string. IP is decoded from WifiManager.getConnectionInfo(); MAC is read
via NetworkInterface; SSID falls back to parsing 'dumpsys wifi' via root
when WifiManager returns <unknown ssid> (location permission restriction).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: backcountrymountains

app/src/main/java/org/koreader/launcher/LuaInterface.kt

@@ -29,6 +29,7 @@ interface LuaInterface {
     fun getLightDialogState(): Int
     fun getName(): String
     fun getNetworkInfo(): String
+    fun getWifiNetworkDetails(): String
     fun getPlatformName(): String
     fun getScreenAvailableHeight(): Int
     fun getScreenAvailableWidth(): Int

app/src/main/java/org/koreader/launcher/MainActivity.kt

@@ -438,6 +438,10 @@ class MainActivity : NativeActivity(), LuaInterface,
         return networkInfo()
     }
 
+    override fun getWifiNetworkDetails(): String {
+        return wifiNetworkDetails()
+    }
+
     override fun getPlatformName(): String {
         return platform
     }

app/src/main/java/org/koreader/launcher/extensions/ActivityExtensions.kt

@@ -19,6 +19,7 @@ import android.view.Surface
 import android.view.View
 import androidx.appcompat.app.AlertDialog
 import androidx.core.content.ContextCompat
+import java.net.NetworkInterface
 import java.util.*
 
 val Activity.platform: String
@@ -211,6 +212,40 @@ fun Activity.setWifiRadio(enable: Boolean): Boolean {
     }
 }
 
+@Suppress("DEPRECATION")
+fun Activity.wifiNetworkDetails(): String {
+    if (!wifiEnabled()) return ""
+    val wifi = applicationContext.getSystemService(Context.WIFI_SERVICE) as? WifiManager ?: return ""
+    val info = wifi.connectionInfo
+
+    val ipInt = info?.ipAddress ?: 0
+    val ip = if (ipInt == 0) "" else "%d.%d.%d.%d".format(
+        ipInt and 0xFF, (ipInt shr 8) and 0xFF,
+        (ipInt shr 16) and 0xFF, (ipInt shr 24) and 0xFF
+    )
+
+    val mac = try {
+        NetworkInterface.getByName("wlan0")?.hardwareAddress
+            ?.joinToString(":") { "%02X".format(it) } ?: ""
+    } catch (e: Exception) { "" }
+
+    var ssid = info?.ssid?.removeSurrounding("\"") ?: ""
+    if (ssid.isEmpty() || ssid == "<unknown ssid>" || ssid.startsWith("0x")) {
+        ssid = try {
+            val proc = Runtime.getRuntime().exec(arrayOf("su", "-c",
+                "dumpsys wifi 2>/dev/null | grep -m1 'extra:'"))
+            val line = proc.inputStream.bufferedReader().readLine() ?: ""
+            Regex("""extra: "([^"]*)"""").find(line)?.groupValues?.get(1) ?: ""
+        } catch (e: Exception) { "" }
+    }
+
+    return listOfNotNull(
+        if (ssid.isNotEmpty()) "SSID: $ssid" else null,
+        if (ip.isNotEmpty()) "IP: $ip" else null,
+        if (mac.isNotEmpty()) "MAC: $mac" else null
+    ).joinToString("\n")
+}
+
 fun Activity.pruneCacheDir() {
     try {
         getExternalFilesDir(null)?.let {

assets/android.lua

@@ -2499,6 +2499,17 @@ local function run(android_app_state)
         end)
     end
 
+    android.getWifiNetworkDetails = function()
+        return JNI:context(android.app.activity.vm, function(jni)
+            local details = jni:callObjectMethod(
+                android.app.activity.clazz,
+                "getWifiNetworkDetails",
+                "()Ljava/lang/String;"
+            )
+            return jni:to_string(details)
+        end)
+    end
+
     android.download = function(url, name)
         return JNI:context(android.app.activity.vm, function(jni)
             local uri_string = jni.env[0].NewStringUTF(jni.env, url)