* i2ptunnel:

   - Create backup privkey files (ticket #752)
   - Fix NPE in Android startup

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/TunnelController.java

@@ -19,8 +19,10 @@ import net.i2p.client.I2PSession;
 import net.i2p.data.Base32;
 import net.i2p.data.Destination;
 import net.i2p.i2ptunnel.socks.I2PSOCKSTunnel;
+import net.i2p.util.FileUtil;
 import net.i2p.util.I2PAppThread;
 import net.i2p.util.Log;
+import net.i2p.util.SecureFile;
 import net.i2p.util.SecureFileOutputStream;
 
 /**
@@ -43,6 +45,8 @@ public class TunnelController implements Logging {
     private boolean _running;
     private boolean _starting;
     
+    private static final String KEY_BACKUP_DIR = "i2ptunnel-keyBackup";
+
     /**
      * Create a new controller for a tunnel out of the specific config options.
      * The config may contain a large number of options - only ones that begin in
@@ -102,8 +106,19 @@ public class TunnelController implements Logging {
             Destination dest = client.createDestination(fos);
             String destStr = dest.toBase64();
             log("Private key created and saved in " + keyFile.getAbsolutePath());
+            log("You should backup this file in a secure place.");
             log("New destination: " + destStr);
             log("Base32: " + Base32.encode(dest.calculateHash().getData()) + ".b32.i2p");
+            File backupDir = new SecureFile(I2PAppContext.getGlobalContext().getConfigDir(), KEY_BACKUP_DIR);
+            if (backupDir.exists() || backupDir.mkdir()) {
+                String name = keyFile.getName();
+                if (name.endsWith(".dat"))
+                    name = name.substring(0, name.length() - 4);
+                name += "-" + I2PAppContext.getGlobalContext().clock().now() + ".dat";
+                File backup = new File(backupDir, name);
+                if (FileUtil.copy(keyFile, backup, false, true))
+                    log("Private key backup saved to " + backup.getAbsolutePath());
+            }
         } catch (I2PException ie) {
             if (_log.shouldLog(Log.ERROR))
                 _log.error("Error creating new destination", ie);

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/TunnelControllerGroup.java

@@ -20,6 +20,7 @@ import net.i2p.data.DataHelper;
 import net.i2p.util.I2PAppThread;
 import net.i2p.util.Log;
 import net.i2p.util.OrderedProperties;
+import net.i2p.util.SystemVersion;
 
 /**
  * Coordinate a set of tunnels within the JVM, loading and storing their config
@@ -50,7 +51,7 @@ public class TunnelControllerGroup implements ClientApp {
     
     /**
      *  In I2PAppContext will instantiate if necessary and always return non-null.
-     *  As of 0.9.4, when in RouterContext, will return null
+     *  As of 0.9.4, when in RouterContext, will return null (except in Android)
      *  if the TCG has not yet been started by the router.
      *
      *  @throws IllegalArgumentException if unable to load from i2ptunnel.config
@@ -59,7 +60,7 @@ public class TunnelControllerGroup implements ClientApp {
         synchronized (TunnelControllerGroup.class) {
             if (_instance == null) {
                 I2PAppContext ctx = I2PAppContext.getGlobalContext();
-                if (!ctx.isRouterContext()) {
+                if (SystemVersion.isAndroid() || !ctx.isRouterContext()) {
                     _instance = new TunnelControllerGroup(ctx, null, null);
                     _instance.startup();
                 } // else wait for the router to start it