From 8dc39ff8e4684cbd9235824c58a5deb70fb818ee Mon Sep 17 00:00:00 2001
From: cyBerta <cyberta@riseup.net>
Date: Sun, 11 Jul 2021 19:25:50 +0200
Subject: implement ClientTransportPluginInterface to start / stop snowflake
 client for tor

---
 .../bitmaskclient/tor/ClientTransportPlugin.java   | 93 +++++++++++++++++++++-
 1 file changed, 92 insertions(+), 1 deletion(-)

(limited to 'app/src/main/java/se/leap/bitmaskclient/tor/ClientTransportPlugin.java')

diff --git a/app/src/main/java/se/leap/bitmaskclient/tor/ClientTransportPlugin.java b/app/src/main/java/se/leap/bitmaskclient/tor/ClientTransportPlugin.java
index 9ed805e4..9e3828de 100644
--- a/app/src/main/java/se/leap/bitmaskclient/tor/ClientTransportPlugin.java
+++ b/app/src/main/java/se/leap/bitmaskclient/tor/ClientTransportPlugin.java
@@ -1,4 +1,95 @@
 package se.leap.bitmaskclient.tor;
 
-public class ClientTransportPlugin {
+import android.content.Context;
+import android.util.Log;
+
+import androidx.annotation.Nullable;
+
+import org.torproject.jni.ClientTransportPluginInterface;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.lang.ref.WeakReference;
+import java.util.HashMap;
+
+import IPtProxy.IPtProxy;
+
+public class ClientTransportPlugin implements ClientTransportPluginInterface {
+    public static String TAG = ClientTransportPlugin.class.getSimpleName();
+
+    private HashMap<String, String> mFronts;
+    private final WeakReference<Context> contextRef;
+    private long snowflakePort = -1;
+
+    public ClientTransportPlugin(Context context) {
+        this.contextRef = new WeakReference<>(context);
+        loadCdnFronts(context);
+    }
+
+    @Override
+    public void start() {
+        Context context = contextRef.get();
+        if (context == null) {
+            return;
+        }
+        File logfile = new File(context.getApplicationContext().getCacheDir(), "snowflake.log");
+        Log.d(TAG, "logfile at " + logfile.getAbsolutePath());
+        if (!logfile.exists()) {
+            try {
+                logfile.createNewFile();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+
+        //this is using the current, default Tor snowflake infrastructure
+        String target = getCdnFront("snowflake-target");
+        String front = getCdnFront("snowflake-front");
+        String stunServer = getCdnFront("snowflake-stun");
+        Log.d(TAG, "startSnowflake. target: " + target + ", front:" + front + ", stunServer" + stunServer);
+        snowflakePort = IPtProxy.startSnowflake( stunServer, target, front, logfile.getAbsolutePath(), false, false, true, 1);
+        Log.d(TAG, "startSnowflake running on port: " + snowflakePort);
+    }
+
+    @Override
+    public void stop() {
+        IPtProxy.stopSnowflake();
+        snowflakePort = -1;
+    }
+
+    @Override
+    public String getTorrc() {
+        return "UseBridges 1\n" +
+                "ClientTransportPlugin snowflake socks5 127.0.0.1:" + snowflakePort + "\n" +
+                "Bridge snowflake 192.0.2.3:1";
+    }
+
+    private void loadCdnFronts(Context context) {
+        if (mFronts == null) {
+            mFronts = new HashMap<>();
+        }
+        try {
+            BufferedReader reader = new BufferedReader(new InputStreamReader(context.getAssets().open("fronts")));
+            String line;
+            while (true) {
+                line = reader.readLine();
+                if (line == null) break;
+                String[] front = line.split(" ");
+                mFronts.put(front[0], front[1]);
+                Log.d(TAG, "front: " + front[0] + ", " + front[1]);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Nullable
+    private String getCdnFront(String service) {
+        if (mFronts != null) {
+            return mFronts.get(service);
+        }
+        return null;
+    }
 }
-- 
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