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Cleaned up address selection code for LAN and WAN plugins.

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The LAN plugin only accepts IPv4 link-local or site-local addresses.
This rules out LANs that use globally routable addresses (such as UCL),
but also reduces the chances of the LAN plugin making observable
connections across the WAN, which could reveal the social graph.

Both plugins will attempt to reuse the previous address and port only if
there's currently an interface with that address; this will avoid
unnecessary attempts to bind to nonexistent addresses.
This commit is contained in:
akwizgran
2014-04-04 13:14:00 +01:00
parent fbe1c799dd
commit fe82591fdf
3 changed files with 61 additions and 62 deletions
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17
briar-tests/src/org/briarproject/plugins/tcp/LanTcpPluginTest.java
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@@ -3,6 +3,8 @@ package org.briarproject.plugins.tcp;
import static java.util.concurrent.TimeUnit.SECONDS;
import java.io.IOException;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
@@ -29,24 +31,25 @@ public class LanTcpPluginTest extends BriarTestCase {
@Test
public void testIncomingConnection() throws Exception {
Callback callback = new Callback();
callback.local.put("address", "127.0.0.1");
callback.local.put("port", "0");
Executor executor = Executors.newCachedThreadPool();
DuplexPlugin plugin = new LanTcpPlugin(executor, callback, 0, 0, 0);
plugin.start();
// The plugin should have bound a socket and stored the port number
assertTrue(callback.propertiesLatch.await(5, SECONDS));
String host = callback.local.get("address");
assertNotNull(host);
assertEquals("127.0.0.1", host);
String addrString = callback.local.get("address");
assertNotNull(addrString);
InetAddress addr = InetAddress.getByName(addrString);
assertTrue(addr instanceof Inet4Address);
assertFalse(addr.isLoopbackAddress());
assertTrue(addr.isLinkLocalAddress() || addr.isSiteLocalAddress());
String portString = callback.local.get("port");
assertNotNull(portString);
int port = Integer.parseInt(portString);
assertTrue(port > 0 && port < 65536);
// The plugin should be listening on the port
InetSocketAddress addr = new InetSocketAddress(host, port);
InetSocketAddress socketAddr = new InetSocketAddress(addr, port);
Socket s = new Socket();
s.connect(addr, 100);
s.connect(socketAddr, 100);
assertTrue(callback.connectionsLatch.await(5, SECONDS));
s.close();
// Stop the plugin