android: Log some information about the Android version and the device

src/frontends/android/app/src/main/java/org/strongswan/android/logic/CharonVpnService.java

@@ -939,6 +939,23 @@ public class CharonVpnService extends VpnService implements Runnable, VpnStateSe
 		}
 	}
 
+	/**
+	 * Function called via JNI to determine information about the Android version.
+	 */
+	private static String getAndroidVersion()
+	{
+		return "Android " + Build.VERSION.RELEASE + " - " + Build.DISPLAY +
+			   "/" + Build.VERSION.SECURITY_PATCH;
+	}
+
+	/**
+	 * Function called via JNI to determine information about the device.
+	 */
+	private static String getDeviceString()
+	{
+		return Build.MODEL + " - " + Build.BRAND + "/" + Build.PRODUCT + "/" + Build.MANUFACTURER;
+	}
+
 	/*
 	 * The libraries are extracted to /data/data/org.strongswan.android/...
 	 * during installation.  On newer releases most are loaded in JNI_OnLoad.

src/frontends/android/app/src/main/jni/libandroidbridge/android_jni.c

@@ -1,8 +1,8 @@
 /*
- * Copyright (C) 2012-2015 Tobias Brunner
+ * Copyright (C) 2012-2017 Tobias Brunner
  * Copyright (C) 2012 Giuliano Grassi
  * Copyright (C) 2012 Ralf Sager
- * Hochschule fuer Technik Rapperswil
+ * HSR Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -46,6 +46,8 @@ jclass *android_charonvpnservice_class;
 jclass *android_charonvpnservice_builder_class;
 jclass *android_simple_fetcher_class;
 android_sdk_version_t android_sdk_version;
+char *android_version_string;
+char *android_device_string;
 
 /**
  * Thread-local variable. Only used because of the destructor
@@ -97,6 +99,8 @@ jint JNI_OnLoad(JavaVM *vm, void *reserved)
 	JNIEnv *env;
 	jclass jversion;
 	jfieldID jsdk_int;
+	jmethodID method_id;
+	jstring jstr;
 	int i;
 
 	android_jvm = vm;
@@ -131,6 +135,22 @@ jint JNI_OnLoad(JavaVM *vm, void *reserved)
 	jsdk_int = (*env)->GetStaticFieldID(env, jversion, "SDK_INT", "I");
 	android_sdk_version = (*env)->GetStaticIntField(env, jversion, jsdk_int);
 
+	method_id = (*env)->GetStaticMethodID(env, android_charonvpnservice_class,
+									"getAndroidVersion", "()Ljava/lang/String;");
+	jstr = (*env)->CallStaticObjectMethod(env,
+									android_charonvpnservice_class, method_id);
+	if (jstr)
+	{
+		android_version_string = androidjni_convert_jstring(env, jstr);
+	}
+	method_id = (*env)->GetStaticMethodID(env, android_charonvpnservice_class,
+									"getDeviceString", "()Ljava/lang/String;");
+	jstr = (*env)->CallStaticObjectMethod(env,
+									android_charonvpnservice_class, method_id);
+	if (jstr)
+	{
+		android_device_string = androidjni_convert_jstring(env, jstr);
+	}
 	return JNI_VERSION_1_6;
 }
 
@@ -151,5 +171,6 @@ void JNI_OnUnload(JavaVM *vm, void *reserved)
 			dlclose(libs[i].handle);
 		}
 	}
+	free(android_version_string);
+	free(android_device_string);
 }
-

src/frontends/android/app/src/main/jni/libandroidbridge/android_jni.h

@@ -1,8 +1,8 @@
 /*
- * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012-2017 Tobias Brunner
  * Copyright (C) 2012 Giuliano Grassi
  * Copyright (C) 2012 Ralf Sager
- * Hochschule fuer Technik Rapperswil
+ * HSR Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -66,6 +66,20 @@ typedef enum {
  */
 extern android_sdk_version_t android_sdk_version;
 
+/**
+ * A description of the current Android release
+ *
+ * see android.os.Build
+ */
+extern char *android_version_string;
+
+/**
+ * A description of the current device
+ *
+ * see android.os.Build
+ */
+extern char *android_device_string;
+
 /**
  * Attach the current thread to the JVM
  *

src/frontends/android/app/src/main/jni/libandroidbridge/charonservice.c

@@ -644,7 +644,8 @@ JNI_METHOD(CharonVpnService, initializeCharon, jboolean,
 	{
 		memset(&utsname, 0, sizeof(utsname));
 	}
-	DBG1(DBG_DMN, "Starting IKE charon daemon (strongSwan "VERSION", %s %s, %s)",
+	DBG1(DBG_DMN, "Starting IKE charon daemon (strongSwan "VERSION", %s, %s, "
+		 "%s %s, %s)", android_version_string, android_device_string,
 		  utsname.sysname, utsname.release, utsname.machine);
 
 #ifdef PLUGINS_BYOD