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Posted to dev@mina.apache.org by "Guillaume Nodet (Jira)" <ji...@apache.org> on 2020/09/23 08:56:00 UTC
[jira] [Commented] (SSHD-1066) Support multiple local interfaces in
PortForwarding
[ https://issues.apache.org/jira/browse/SSHD-1066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17200664#comment-17200664 ]
Guillaume Nodet commented on SSHD-1066:
---------------------------------------
I've pushed a PR with a unit test https://github.com/apache/mina-sshd/pull/170/commits/89bb372b69ef4f20929e42b9af2f013790bf2f76
> Support multiple local interfaces in PortForwarding
> ---------------------------------------------------
>
> Key: SSHD-1066
> URL: https://issues.apache.org/jira/browse/SSHD-1066
> Project: MINA SSHD
> Issue Type: New Feature
> Affects Versions: 2.5.1
> Reporter: Guillermo Grandes
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I'm trying to listen in same port on 2 IPs of same machine, _multihomed_, the equivalent in openssh is:
> {noformat}
> # ssh -L 127.0.0.2:8080:test.javastack.org:80 -L 127.0.0.3:8080:test.javastack.org:80 test-sshd@server -N
> # sudo netstat -lntp | grep :8080
> tcp 0 0 127.0.0.3:8080 0.0.0.0:* LISTEN 2650/ssh
> tcp 0 0 127.0.0.2:8080 0.0.0.0:* LISTEN 2650/ssh
> {noformat}
> Sample code to reproduce the test case:
> {code:java}
> public static final int DEFAULT_TIMEOUT = 10000;
> public static void test(final String username, final String password, final String host, final int port)
> throws IOException {
> boolean testLocal = true;
> try (SshClient client = SshClient.setUpDefaultClient()) {
> client.setServerKeyVerifier(AcceptAllServerKeyVerifier.INSTANCE);
> client.start();
> try {
> ConnectFuture connect = client.connect(username, host, port);
> connect.await(DEFAULT_TIMEOUT);
> ClientSession session = connect.getClientSession();
> session.addPasswordIdentity(password);
> session.auth().verify(DEFAULT_TIMEOUT);
> if (testLocal) {
> System.out.println("================== Local 1 ==================");
> ExplicitPortForwardingTracker localTracker1 = session.createLocalPortForwardingTracker(
> new SshdSocketAddress("127.0.0.2", 8080),
> new SshdSocketAddress("test.javastack.org", 80));
> sleep(1000);
> System.out.println("LocalPortForwarding: " //
> + localTracker1.getLocalAddress() + " -> " //
> + localTracker1.getRemoteAddress());
> SshdSocketAddress localSocketAddress1 = localTracker1.getLocalAddress();
> if (localSocketAddress1 != null) {
> Proxy proxy = new Proxy(Proxy.Type.HTTP,
> new InetSocketAddress(localSocketAddress1.getHostName(), //
> localSocketAddress1.getPort()));
> testRemoteURL(proxy, "http://test.javastack.org/");
> }
> System.out.println("================== Local 2 ==================");
> ExplicitPortForwardingTracker localTracker2 = session.createLocalPortForwardingTracker(
> new SshdSocketAddress("127.0.0.3", 8080),
> new SshdSocketAddress("test.javastack.org", 80));
> sleep(1000);
> System.out.println("LocalPortForwarding: " //
> + localTracker2.getLocalAddress() + " -> " //
> + localTracker2.getRemoteAddress());
> SshdSocketAddress localSocketAddress2 = localTracker2.getLocalAddress();
> if (localSocketAddress2 != null) {
> Proxy proxy = new Proxy(Proxy.Type.HTTP,
> new InetSocketAddress(localSocketAddress2.getHostName(), //
> localSocketAddress2.getPort()));
> testRemoteURL(proxy, "http://test.javastack.org/");
> }
> }
> } finally {
> client.stop();
> }
> }
> }
> private static final void sleep(final long t) {
> try {
> Thread.sleep(t);
> } catch (Exception ign) {
> }
> }
> private static final void testRemoteURL(final Proxy proxy, final String url) throws IOException {
> HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection(proxy);
> connection.setConnectTimeout(DEFAULT_TIMEOUT);
> connection.setReadTimeout(DEFAULT_TIMEOUT);
> System.out.println("Get URL: " + connection.getURL());
> try {
> BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
> System.out.println("Response from server:");
> String inputLine;
> while ((inputLine = in.readLine()) != null) {
> System.out.println(inputLine);
> }
> in.close();
> } catch (Exception e) {
> System.out.println("Failed: " + e);
> }
> }
> public static void main(String[] args) throws Throwable {
> test("test-sshd", "secret", "server", 22);
> sleep(3000);
> }
> {code}
> Error received:
> {code:none}
> Exception in thread "main" java.io.IOException: Multiple local port forwarding addressing on port=8080: current=test.javastack.org:80, previous=test.javastack.org:80
> at org.apache.sshd.common.forward.DefaultForwardingFilter.startLocalPortForwarding(DefaultForwardingFilter.java:208)
> at org.apache.sshd.client.session.AbstractClientSession.startLocalPortForwarding(AbstractClientSession.java:374)
> at org.apache.sshd.client.session.ClientSession.createLocalPortForwardingTracker(ClientSession.java:316)
> at org.javastack.jentunnel.sandbox.SimpleBindingTest.test(SimpleBindingTest.java:52)
> {code}
> Result Expected:
> {noformat}
> ================== Local 1 ==================
> LocalPortForwarding: 127.0.0.2:8080 -> test.javastack.org:80
> Get URL: http://test.javastack.org/
> Response from server:
> OK
> ================== Local 2 ==================
> LocalPortForwarding: 127.0.0.3:8080 -> test.javastack.org:80
> Get URL: http://test.javastack.org/
> Response from server:
> OK
> {noformat}
> * Note-1: The usage of loopback addresses (127.0.0.0/8) and same destination is to simplify/reproduce easily, don't care.
> * Note-2: I don't checked if startRemotePortForwarding/startDynamicPortForwarding reproduce same issue as startLocalPortForwarding. But I suppose that yes.
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