android: Properly handle failures while initializing charon

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

@@ -589,7 +589,7 @@ static void segv_handler(int signal)
 /**
  * Initialize charon and the libraries via JNI
  */
-JNI_METHOD(CharonVpnService, initializeCharon, void,
+JNI_METHOD(CharonVpnService, initializeCharon, jboolean,
 	jobject builder, jstring jlogfile, jboolean byod)
 {
 	struct sigaction action;
@@ -603,7 +603,7 @@ JNI_METHOD(CharonVpnService, initializeCharon, void,
 	if (!library_init(NULL))
 	{
 		library_deinit();
-		return;
+		return FALSE;
 	}
 
 	/* set options before initializing other libraries that might read them */
@@ -615,7 +615,7 @@ JNI_METHOD(CharonVpnService, initializeCharon, void,
 	{
 		libhydra_deinit();
 		library_deinit();
-		return;
+		return FALSE;
 	}
 
 	if (!libipsec_init())
@@ -623,7 +623,7 @@ JNI_METHOD(CharonVpnService, initializeCharon, void,
 		libipsec_deinit();
 		libhydra_deinit();
 		library_deinit();
-		return;
+		return FALSE;
 	}
 
 	if (!libcharon_init("charon"))
@@ -632,7 +632,7 @@ JNI_METHOD(CharonVpnService, initializeCharon, void,
 		libipsec_deinit();
 		libhydra_deinit();
 		library_deinit();
-		return;
+		return FALSE;
 	}
 
 	charon->load_loggers(charon, NULL, FALSE);
@@ -664,7 +664,7 @@ JNI_METHOD(CharonVpnService, initializeCharon, void,
 		libipsec_deinit();
 		libhydra_deinit();
 		library_deinit();
-		return;
+		return FALSE;
 	}
 	lib->plugins->status(lib->plugins, LEVEL_CTRL);
 
@@ -680,6 +680,7 @@ JNI_METHOD(CharonVpnService, initializeCharon, void,
 
 	/* start daemon (i.e. the threads in the thread-pool) */
 	charon->start(charon);
+	return TRUE;
 }
 
 /**

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

@@ -214,12 +214,20 @@ public class CharonVpnService extends VpnService implements Runnable
 						mIsDisconnecting = false;
 
 						BuilderAdapter builder = new BuilderAdapter(mCurrentProfile.getName());
-						initializeCharon(builder, mLogFile, mCurrentProfile.getVpnType().getEnableBYOD());
-						Log.i(TAG, "charon started");
-
-						initiate(mCurrentProfile.getVpnType().getIdentifier(),
-								 mCurrentProfile.getGateway(), mCurrentProfile.getUsername(),
-								 mCurrentProfile.getPassword());
+						if (initializeCharon(builder, mLogFile, mCurrentProfile.getVpnType().getEnableBYOD()))
+						{
+							Log.i(TAG, "charon started");
+							initiate(mCurrentProfile.getVpnType().getIdentifier(),
+									 mCurrentProfile.getGateway(), mCurrentProfile.getUsername(),
+									 mCurrentProfile.getPassword());
+						}
+						else
+						{
+							Log.e(TAG, "failed to start charon");
+							setError(ErrorState.GENERIC_ERROR);
+							setState(State.DISABLED);
+							mCurrentProfile = null;
+						}
 					}
 				}
 				catch (InterruptedException ex)
@@ -517,8 +525,9 @@ public class CharonVpnService extends VpnService implements Runnable
 	 * @param builder BuilderAdapter for this connection
 	 * @param logfile absolute path to the logfile
 	 * @param boyd enable BYOD features
+	 * @return TRUE if initialization was successful
 	 */
-	public native void initializeCharon(BuilderAdapter builder, String logfile, boolean byod);
+	public native boolean initializeCharon(BuilderAdapter builder, String logfile, boolean byod);
 
 	/**
 	 * Deinitialize charon, provided by libandroidbridge.so