undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/java/net/MulticastSocket/SetLoopbackMode.java

@@ -0,0 +1,178 @@
+/*
+ * Copyright (c) 2001, 2021, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 4686717
+ * @summary Test MulticastSocket.setLoopbackMode
+ * @library /test/lib
+ * @modules java.base/java.net:+open
+ * @build jdk.test.lib.NetworkConfiguration
+ *        jdk.test.lib.Platform
+ * @run main/othervm SetLoopbackMode
+ */
+
+import java.lang.reflect.Method;
+import java.lang.reflect.UndeclaredThrowableException;
+import java.net.*;
+import java.io.IOException;
+import jdk.test.lib.NetworkConfiguration;
+
+public class SetLoopbackMode {
+
+    static final boolean FAILED = true;
+    static final boolean PASSED = false;
+
+    static boolean test(MulticastSocket mc, InetAddress grp) throws IOException {
+
+        boolean disabled = mc.getLoopbackMode();
+
+        if (disabled) {
+            System.out.println("Loopback mode is disabled.");
+        } else {
+            System.out.println("Loopback mode is enabled.");
+        }
+
+        System.out.println(mc.getLocalSocketAddress());
+
+        byte b[] = "hello".getBytes();
+        DatagramPacket p = new DatagramPacket(b, b.length, grp,
+                                mc.getLocalPort());
+        mc.send(p);
+
+        boolean gotPacket = false;
+
+        mc.setSoTimeout(1000);
+        try {
+            b = new byte[16];
+            p = new DatagramPacket(b, b.length);
+            mc.receive(p);
+            gotPacket = true;
+
+            /* purge any additional copies of the packet */
+            for (;;) {
+                mc.receive(p);
+            }
+
+        } catch (SocketTimeoutException x) {
+        }
+
+        if (gotPacket && disabled) {
+            System.out.println("Packet received (unexpected as loopback is disabled)");
+            return FAILED;
+        }
+        if (!gotPacket && !disabled) {
+            System.out.println
+                ("Packet not received (packet excepted as loopback is enabled)");
+            return FAILED;
+        }
+
+        if (gotPacket && !disabled) {
+            System.out.println("Packet received - correct.");
+        } else {
+            System.out.println("Packet not received - correct.");
+        }
+
+        return PASSED;
+    }
+
+    private static boolean canUseIPv6(NetworkConfiguration nc) {
+        return nc.ip6MulticastInterfaces().toArray().length > 0;
+    }
+
+    public static void main (String args[]) throws Exception {
+        int failures = 0;
+        NetworkConfiguration nc = NetworkConfiguration.probe();
+
+        try (MulticastSocket mc = new MulticastSocket()) {
+            InetAddress grp = InetAddress.getByName("224.80.80.80");
+
+
+            /*
+             * If IPv6 is available then use IPv6 multicast group - needed
+             * to workaround Linux IPv6 bug whereby !IPV6_MULTICAST_LOOP
+             * doesn't prevent loopback of IPv4 multicast packets.
+             */
+
+            if (canUseIPv6(nc)) {
+                System.out.println("IPv6 can be used");
+                grp = InetAddress.getByName("ff01::1");
+            } else {
+                System.out.println("IPv6 cannot be used: using IPv4");
+            }
+            System.out.println("Default network interface: " + DefaultInterface.getDefaultName());
+            System.out.println("\nTest will use multicast group: " + grp);
+            try {
+                System.out.println("NetworkInterface.getByInetAddress(grp): "
+                        + getName(NetworkInterface.getByInetAddress(grp)));
+            } catch (Exception x) {
+                // OK
+            }
+            mc.joinGroup(grp);
+
+            System.out.println("\n******************\n");
+
+            mc.setLoopbackMode(true);
+            if (test(mc, grp) == FAILED) failures++;
+
+            System.out.println("\n******************\n");
+
+            mc.setLoopbackMode(false);
+            if (test(mc, grp) == FAILED) failures++;
+
+            System.out.println("\n******************\n");
+
+            if (failures > 0) {
+                throw new RuntimeException("Test failed");
+            }
+        }
+    }
+
+    static String getName(NetworkInterface nif) {
+        return nif == null ? null : nif.getName();
+    }
+
+    static class DefaultInterface {
+        static final Method GET_DEFAULT;
+        static {
+            try {
+                GET_DEFAULT = Class.forName("java.net.DefaultInterface")
+                        .getDeclaredMethod("getDefault");
+                GET_DEFAULT.setAccessible(true);
+            } catch (Exception x) {
+                throw new ExceptionInInitializerError(x);
+            }
+        }
+        static NetworkInterface getDefault() {
+            try {
+                return (NetworkInterface) GET_DEFAULT
+                        .invoke(null);
+            } catch (Exception x) {
+                throw new UndeclaredThrowableException(x);
+            }
+        }
+        static String getDefaultName() {
+            return getName(getDefault());
+        }
+    }
+}