Support TOR connectivity (fixes #589).

src/main/java/com/nutomic/syncthingandroid/syncthing/SyncthingRunnable.java

@@ -122,6 +122,10 @@ public class SyncthingRunnable implements Runnable {
             env.put("STNOUPGRADE", "1");
             env.put("STGUIAUTH", sp.getString("gui_user", "") + ":" +
                     sp.getString("gui_password", ""));
+            if (sp.getBoolean("use_tor", false)) {
+                env.put("all_proxy", "socks5://localhost:9050");
+                env.put("ALL_PROXY_NO_FALLBACK", "1");
+            }
             process = pb.start();
             mSyncthing.set(process);
 

src/main/res/values/strings.xml

@@ -304,6 +304,10 @@ Please report any problems you encounter via Github.</string>
 
     <string name="run_as_foreground_service_summary">If enabled, Syncthing will run with foreground priority and is less likely to be stopped by Android. This might cause other services to be stopped if available memory is low. A low-priority notification needs to be shown due to Android requirements, regardless of the \"Notification\" setting.</string>
 
+    <string name="use_tor_title">Use TOR</string>
+
+    <string name="use_tor_summary">Force all traffic through TOR for increased privacy</string>
+
     <!-- Toast shown after config was successfully exported -->
     <string name="config_export_successful">Config was exported to %1$s</string>
 

src/main/res/xml/app_settings.xml

@@ -168,6 +168,11 @@
                 android:summary="@string/run_as_foreground_service_summary"
                 android:defaultValue="false" />
 
+            <CheckBoxPreference
+                android:key="use_tor"
+                android:title="@string/use_tor_title"
+                android:summary="@string/use_tor_summary" />
+
         </PreferenceScreen>
 
     </PreferenceCategory>