Add state saving mechanism to support proc restart

Also...
+ stop daemons before getting server IP;
+ remove setForeground();
+ add the DBG flag for Log.d calls.

PatchSet 3:
+ add CHALLENGE_ERROR and REMOTE_HUNG_UP to VpnManager
+ broadcast new error codes in VpnService
+ check local IP change instead of dns change
+ move removeStates() to VpnService.onFinalCleanUp()

PatchSet 7:
+ add encryption flag to PptpProfile
+ PptpService and MtpdHelper are revised accordingly

2 files changed, 16 insertions, 0 deletions

diff --git a/vpn/java/android/net/vpn/PptpProfile.java b/vpn/java/android/net/vpn/PptpProfile.java
index c68bb71..cdc90f0 100644
--- a/vpn/java/android/net/vpn/PptpProfile.java
+++ b/vpn/java/android/net/vpn/PptpProfile.java
@@ -22,9 +22,21 @@ package android.net.vpn;
  */
 public class PptpProfile extends VpnProfile {
     private static final long serialVersionUID = 1L;
+    private boolean mEncryption = true;
 
     @Override
     public VpnType getType() {
         return VpnType.PPTP;
     }
+
+    /**
+     * Enables/disables the encryption for PPTP tunnel.
+     */
+    public void setEncryptionEnabled(boolean enabled) {
+        mEncryption = enabled;
+    }
+
+    public boolean isEncryptionEnabled() {
+        return mEncryption;
+    }
 }
diff --git a/vpn/java/android/net/vpn/VpnManager.java b/vpn/java/android/net/vpn/VpnManager.java
index 0bf2346..e448e5a 100644
--- a/vpn/java/android/net/vpn/VpnManager.java
+++ b/vpn/java/android/net/vpn/VpnManager.java
@@ -50,6 +50,10 @@ public class VpnManager {
     public static final int VPN_ERROR_CONNECTION_FAILED = 2;
     /** Error code to indicate the server is not known. */
     public static final int VPN_ERROR_UNKNOWN_SERVER = 3;
+    /** Error code to indicate an error from challenge response. */
+    public static final int VPN_ERROR_CHALLENGE = 4;
+    /** Error code to indicate an error of remote server hanging up. */
+    public static final int VPN_ERROR_REMOTE_HUNG_UP = 5;
     private static final int VPN_ERROR_NO_ERROR = 0;
 
     public static final String PROFILES_PATH = "/data/misc/vpn/profiles";