From 20f906ef16d10d7f69a7355bd590ae99cb64723b Mon Sep 17 00:00:00 2001
From: cyberta <cyberta@riseup.net>
Date: Sat, 25 Jan 2020 14:40:13 -0600
Subject: add and remove configuring tethering rules on vpn start and shutdown

---
 .../firewall/StartIPv6FirewallTask.java            | 72 ++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 app/src/main/java/se/leap/bitmaskclient/firewall/StartIPv6FirewallTask.java

(limited to 'app/src/main/java/se/leap/bitmaskclient/firewall/StartIPv6FirewallTask.java')

diff --git a/app/src/main/java/se/leap/bitmaskclient/firewall/StartIPv6FirewallTask.java b/app/src/main/java/se/leap/bitmaskclient/firewall/StartIPv6FirewallTask.java
new file mode 100644
index 00000000..1dbfb9f8
--- /dev/null
+++ b/app/src/main/java/se/leap/bitmaskclient/firewall/StartIPv6FirewallTask.java
@@ -0,0 +1,72 @@
+package se.leap.bitmaskclient.firewall;
+
+import android.os.AsyncTask;
+import android.util.Log;
+
+import java.lang.ref.WeakReference;
+
+import static se.leap.bitmaskclient.firewall.FirewallManager.BITMASK_CHAIN;
+import static se.leap.bitmaskclient.utils.Cmd.runBlockingCmd;
+
+class StartIPv6FirewallTask extends AsyncTask<Void, Boolean, Boolean> {
+
+   private WeakReference<FirewallCallback> callbackWeakReference;
+
+    StartIPv6FirewallTask(FirewallCallback callback) {
+        callbackWeakReference = new WeakReference<>(callback);
+    }
+
+    @Override
+    protected Boolean doInBackground(Void... voids) {
+        StringBuilder log = new StringBuilder();
+        String[] bitmaskChain = new String[]{
+                "su",
+                "id",
+                "ip6tables --list " + BITMASK_CHAIN };
+
+
+        try {
+            boolean hasBitmaskChain = runBlockingCmd(bitmaskChain, log) == 0;
+            boolean allowSu = log.toString().contains("uid=0");
+            callbackWeakReference.get().onSuRequested(allowSu);
+            if (!allowSu) {
+                return false;
+            }
+
+            boolean success;
+            log = new StringBuilder();
+            if (!hasBitmaskChain) {
+                String[] createChainAndRules = new String[]{
+                        "su",
+                        "ip6tables --new-chain " + BITMASK_CHAIN,
+                        "ip6tables --insert OUTPUT --jump " + BITMASK_CHAIN,
+                        "ip6tables --append " + BITMASK_CHAIN + " -p tcp --jump REJECT",
+                        "ip6tables --append " + BITMASK_CHAIN + " -p udp --jump REJECT"
+                };
+                success = runBlockingCmd(createChainAndRules, log) == 0;
+                Log.d(FirewallManager.TAG, "added " + BITMASK_CHAIN + " to ip6tables: " + success);
+                Log.d(FirewallManager.TAG, log.toString());
+                return success;
+            } else {
+                String[] addRules = new String[] {
+                        "su",
+                        "ip6tables --append " + BITMASK_CHAIN + " -p tcp --jump REJECT",
+                        "ip6tables --append " + BITMASK_CHAIN + " -p udp --jump REJECT" };
+                return runBlockingCmd(addRules, log) == 0;
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+            Log.e(FirewallManager.TAG, log.toString());
+        }
+        return false;
+    }
+
+    @Override
+    protected void onPostExecute(Boolean result) {
+        super.onPostExecute(result);
+        FirewallCallback callback = callbackWeakReference.get();
+        if (callback != null) {
+            callback.onFirewallStarted(result);
+        }
+    }
+}
-- 
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