implement usb tethering

3 files changed, 88 insertions, 53 deletions

diff --git a/app/src/main/java/se/leap/bitmaskclient/firewall/FirewallManager.java b/app/src/main/java/se/leap/bitmaskclient/firewall/FirewallManager.java
index 82888668..67cc4625 100644
--- a/app/src/main/java/se/leap/bitmaskclient/firewall/FirewallManager.java
+++ b/app/src/main/java/se/leap/bitmaskclient/firewall/FirewallManager.java
@@ -108,7 +108,7 @@ public class FirewallManager implements FirewallCallback, Observer {
         task.execute();
     }
 
-    private void stopTethering() {
+    public void stopTethering() {
         ShutdownTetheringTask task = new ShutdownTetheringTask(this);
         task.execute();
     }
diff --git a/app/src/main/java/se/leap/bitmaskclient/firewall/SetupTetheringTask.java b/app/src/main/java/se/leap/bitmaskclient/firewall/SetupTetheringTask.java
index 49febc24..7abd01a8 100644
--- a/app/src/main/java/se/leap/bitmaskclient/firewall/SetupTetheringTask.java
+++ b/app/src/main/java/se/leap/bitmaskclient/firewall/SetupTetheringTask.java
@@ -21,6 +21,7 @@ import android.util.Log;
 
 import java.lang.ref.WeakReference;
 import java.net.NetworkInterface;
+import java.util.ArrayList;
 import java.util.Enumeration;
 
 import se.leap.bitmaskclient.tethering.TetheringObservable;
@@ -70,20 +71,28 @@ public class SetupTetheringTask extends AsyncTask<Void, Boolean, Boolean> {
             if (tetheringState.tetherWifiVpn()) {
                 log = new StringBuilder();
                 success = addWifiTetheringRules(tetheringState, log);
+                logError(success, log);
             } else if (!tetheringState.isVpnWifiTetheringAllowed){
                 success = removeWifiTetheringRules(tetheringState, log);
+                logError(success, log);
             }
 
+            log = new StringBuilder();
             if (tetheringState.tetherUsbVpn()) {
                 success = success && addUsbTetheringRules(tetheringState, log);
+                logError(success, log);
             } else if (!tetheringState.isVpnUsbTetheringAllowed) {
                 success = success && removeUsbTetheringRules(tetheringState, log);
+                logError(success, log);
             }
 
+            log = new StringBuilder();
             if (tetheringState.tetherBluetoothVpn()) {
                 success = success && addBluetoothTetheringRules(tetheringState, log);
+                logError(success, log);
             } else if (!tetheringState.isVpnBluetoothTetheringAllowed) {
                 success = success && removeBluetoothTetheringRules(tetheringState, log);
+                logError(success, log);
             }
             return success;
         } catch (Exception e) {
@@ -93,22 +102,10 @@ public class SetupTetheringTask extends AsyncTask<Void, Boolean, Boolean> {
         return false;
     }
 
-
-    //TODO: implement the follwing methods -v
-    private boolean removeBluetoothTetheringRules(TetheringState tetheringState, StringBuilder log) {
-        return true;
-    }
-
-    private boolean removeUsbTetheringRules(TetheringState tetheringState, StringBuilder log) {
-        return true;
-    }
-
-    private boolean addBluetoothTetheringRules(TetheringState tetheringState, StringBuilder log) {
-        return true;
-    }
-
-    private boolean addUsbTetheringRules(TetheringState tetheringState, StringBuilder log) {
-        return true;
+    private void logError(boolean success, StringBuilder log) {
+        if (!success) {
+            Log.e(TAG, log.toString());
+        }
     }
 
 
@@ -128,43 +125,76 @@ public class SetupTetheringTask extends AsyncTask<Void, Boolean, Boolean> {
 
     private boolean addWifiTetheringRules(TetheringState state, StringBuilder log) throws Exception {
         Log.d(TAG, "add Wifi tethering Rules");
-        String[] addRules = new String[] {
+        String[] addRules = getAdditionRules(state.wifiAddress, state.wifiInterface);
+        return runBlockingCmd(addRules, log) == 0;
+    }
+
+    private boolean removeWifiTetheringRules(TetheringState state, StringBuilder log) throws Exception {
+        Log.d(TAG, "add Wifi tethering Rules");
+        String[] removeRules = getDeletionRules(state, state.lastSeenWifiAddress, state.lastSeenWifiInterface);
+        return runBlockingCmd(removeRules, log) == 0;
+    }
+
+    private boolean addUsbTetheringRules(TetheringState state, StringBuilder log) throws Exception {
+        Log.d(TAG, "add usb tethering rules");
+        String[] addRules = getAdditionRules(state.usbAddress, state.usbInterface);
+        return runBlockingCmd(addRules, log) == 0;
+    }
+
+    private boolean removeUsbTetheringRules(TetheringState state, StringBuilder log) throws Exception {
+        Log.d(TAG, "add usb tethering rules");
+        String[] addRules = getDeletionRules(state, state.lastSeenUsbAddress, state.lastSeenUsbInterface);
+        return runBlockingCmd(addRules, log) == 0;
+    }
+
+    //TODO: implement the follwing methods -v
+    private boolean removeBluetoothTetheringRules(TetheringState state, StringBuilder log) {
+        return true;
+    }
+
+    private boolean addBluetoothTetheringRules(TetheringState state, StringBuilder log) {
+        return true;
+    }
+
+    private String[] getAdditionRules(String addressRange, String interfaceName) {
+        return new String[] {
                 "su",
                 "iptables -t filter --flush " + BITMASK_FORWARD,
                 "iptables -t nat --flush " + BITMASK_POSTROUTING,
                 "iptables -t filter --append " + BITMASK_FORWARD + " --jump ACCEPT",
                 "iptables -t nat --append " + BITMASK_POSTROUTING + " --jump MASQUERADE",
-                "if [[ ! `ip rule show from "+ state.wifiAddress+" lookup 61` ]]; " +
-                        "then ip rule add from " + state.wifiAddress + " lookup 61; " +
+                "if [[ ! `ip rule show from "+ addressRange+" lookup 61` ]]; " +
+                        "then ip rule add from " + addressRange + " lookup 61; " +
                         "fi",
                 "if [[ ! `ip route list table 61 | grep 'default dev " + getTunName() + " scope link'` ]]; " +
                         "then ip route add default dev " + getTunName() + " scope link table 61; " +
                         "fi",
-                "if [[ ! `ip route list table 61 | grep '"+ state.wifiAddress+" dev "+ state.wifiInterface+" scope link'` ]]; " +
-                        "then ip route add " + state.wifiAddress + " dev " + state.wifiInterface + " scope link table 61; " +
+                "if [[ ! `ip route list table 61 | grep '"+ addressRange +" dev "+ interfaceName +" scope link'` ]]; " +
+                        "then ip route add " + addressRange + " dev " + interfaceName + " scope link table 61; " +
                         "fi",
-                "if [[ ! `ip route list table 61 | grep 'broadcast 255.255.255.255 dev " + state.wifiInterface + " scope link'` ]]; " +
-                        "then ip route add broadcast 255.255.255.255 dev " + state.wifiInterface + " scope link table 61; " +
+                "if [[ ! `ip route list table 61 | grep 'broadcast 255.255.255.255 dev " + interfaceName + " scope link'` ]]; " +
+                        "then ip route add broadcast 255.255.255.255 dev " + interfaceName + " scope link table 61; " +
                         "fi"
         };
-
-        return runBlockingCmd(addRules, log) == 0;
     }
 
-    private boolean removeWifiTetheringRules(TetheringState state, StringBuilder log) throws Exception {
-        Log.d(TAG, "add Wifi tethering Rules");
-        String[] removeRules = new String[] {
-                "su",
-                "ip route delete broadcast 255.255.255.255 dev " + state.wifiInterface +" scope link table 61",
-                "ip route delete " + state.lastWifiAddress + " dev " + state.wifiInterface +" scope link table 61",
-                "ip route delete default dev " + getTunName() + " scope link table 61",
-                "if [[ `ip rule show from " + state.lastWifiAddress+ " lookup 61` ]]; " +
-                        "then ip rule del from " + state.lastWifiAddress + " lookup 61; " +
-                        "fi",
-        };
-        return runBlockingCmd(removeRules, log) == 0;
+    private String[] getDeletionRules(TetheringState state, String addressRange, String interfaceName) {
+        ArrayList<String> list = new ArrayList<>();
+        list.add("su");
+        list.add("ip route delete broadcast 255.255.255.255 dev " + addressRange +" scope link table 61");
+        list.add("ip route delete " + addressRange + " dev " + interfaceName +" scope link table 61");
+        if (!state.hasAnyVpnTetheringAllowed() || !state.hasAnyDeviceTetheringEnabled()) {
+            list.add("ip route delete default dev " + getTunName() + " scope link table 61");
+        }
+        list.add("if [[ `ip rule show from " + addressRange + " lookup 61` ]]; " +
+                "then ip rule del from " + addressRange + " lookup 61; " +
+                "fi");
+
+        return list.toArray(new String[0]);
     }
 
+
+
     private String getTunName() {
         try {
             for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
diff --git a/app/src/main/java/se/leap/bitmaskclient/firewall/ShutdownTetheringTask.java b/app/src/main/java/se/leap/bitmaskclient/firewall/ShutdownTetheringTask.java
index 6c15c3e3..dcb3ccba 100644
--- a/app/src/main/java/se/leap/bitmaskclient/firewall/ShutdownTetheringTask.java
+++ b/app/src/main/java/se/leap/bitmaskclient/firewall/ShutdownTetheringTask.java
@@ -20,6 +20,7 @@ import android.os.AsyncTask;
 import android.util.Log;
 
 import java.lang.ref.WeakReference;
+import java.util.ArrayList;
 
 import se.leap.bitmaskclient.tethering.TetheringObservable;
 import se.leap.bitmaskclient.tethering.TetheringState;
@@ -50,26 +51,30 @@ public class ShutdownTetheringTask extends AsyncTask<Void, Boolean, Boolean> {
             boolean hasBitmaskChain = runBlockingCmd(bitmaskChain, log) == 0;
             boolean allowSu = log.toString().contains("uid=0");
             callbackWeakReference.get().onSuRequested(allowSu);
-            if (!allowSu || !hasBitmaskChain) {
+            if (!allowSu) {
                 return false;
             }
 
             log = new StringBuilder();
 
-            String[] removeChains = new String[] {
-                    "su",
-                    "ip route flush table 61",
-                    "if [[ `ip rule show from " + tetheringState.wifiAddress+ " lookup 61` ]]; " +
-                            "then ip rule del from " + tetheringState.wifiAddress + " lookup 61; " +
-                            "fi",
-                    "iptables -t filter --delete FORWARD --jump " + BITMASK_FORWARD,
-                    "iptables -t nat --delete POSTROUTING --jump " + BITMASK_POSTROUTING,
-                    "iptables -t filter --flush " + BITMASK_FORWARD,
-                    "iptables -t nat --flush " + BITMASK_POSTROUTING,
-                    "iptables -t filter --delete-chain " + BITMASK_FORWARD,
-                    "iptables -t nat --delete-chain " + BITMASK_POSTROUTING,
-            };
-            return runBlockingCmd(removeChains, log) == 0;
+            ArrayList<String> removeChains = new ArrayList<>();
+            removeChains.add("su");
+            removeChains.add("ip route flush table 61");
+            removeChains.add("if [[ `ip rule show from " + tetheringState.lastSeenWifiAddress+ " lookup 61` ]]; " +
+                    "then ip rule del from " + tetheringState.lastSeenWifiAddress + " lookup 61; " +
+                    "fi");
+            removeChains.add("if [[ `ip rule show from " + tetheringState.lastSeenUsbAddress+ " lookup 61` ]]; " +
+                    "then ip rule del from " + tetheringState.lastSeenUsbAddress + " lookup 61; " +
+                    "fi");
+            if (hasBitmaskChain) {
+                removeChains.add("iptables -t filter --delete FORWARD --jump " + BITMASK_FORWARD);
+                removeChains.add("iptables -t nat --delete POSTROUTING --jump " + BITMASK_POSTROUTING);
+                removeChains.add("iptables -t filter --flush " + BITMASK_FORWARD);
+                removeChains.add("iptables -t nat --flush " + BITMASK_POSTROUTING);
+                removeChains.add("iptables -t filter --delete-chain " + BITMASK_FORWARD);
+                removeChains.add("iptables -t nat --delete-chain " + BITMASK_POSTROUTING);
+            }
+            return runBlockingCmd(removeChains.toArray(new String[0]), log) == 0;
 
         } catch (Exception e) {
             e.printStackTrace();