Improve tests for reverse DNS sources

Author: owen-mc

java/ql/test/library-tests/dataflow/taintsources/A.java

@@ -44,6 +44,11 @@ public void test(ResultSet rs) throws SQLException {
     sink(new URL("test").openConnection().getInputStream()); // $hasRemoteValueFlow
     sink(new Socket("test", 1234).getInputStream()); // $hasRemoteValueFlow
     sink(InetAddress.getByName("test").getHostName()); // $hasReverseDnsValueFlow
+    sink(InetAddress.getLocalHost().getHostName());
+    sink(InetAddress.getLoopbackAddress().getHostName());
+    sink(InetAddress.getByName("test").getCanonicalHostName()); // $hasReverseDnsValueFlow
+    sink(InetAddress.getLocalHost().getCanonicalHostName());
+    sink(InetAddress.getLoopbackAddress().getCanonicalHostName());
 
     sink(System.in); // $hasLocalValueFlow
     sink(new FileInputStream("test")); // $hasLocalValueFlow