通过 Jsch 端口转发的 Java 套接字连接

Question

我正在尝试通过本地端口转发建立套接字连接。流程是：客户端 --> SSHhost --> TargetHost试图通过端口转发来实现这一点，但不断收到 IllegalStateException: Can't connect to rHost 错误。我测试过远程主机确实直接接受连接，我的用例是通过 SSHhost 连接。不确定哪里出了问题，或者我愿意接受不同的方法或建议？谢谢。 try {        jsch.addIdentity(privateKeyPath);        session = jsch.getSession(username, hostL, port);        session.setConfig("PreferredAuthentications", "publickey,keyboard-interactive,password");        java.util.Properties config = new java.util.Properties();        session.setConfig(config);    } catch (JSchException e) {        throw new RuntimeException("Failed to create Jsch Session object.", e);    }    try {        session.connect();        session.setPortForwardingL(8080, rHost, rPort);        try (Socket s = new Socket()) {            s.connect(new InetSocketAddress(rHost, 8080), timeout);        } catch (Exception e) {            String errText = String.format("Can't connect to rHost")            throw new IllegalStateException(errText);        }        session.disconnect();    } catch (JSchException e) {        throw new RuntimeException("Error durring session connection );    }

Answer 1

您需要更改以下行

s.connect(new InetSocketAddress(rHost, 8080), timeout);

到

s.connect(new InetSocketAddress("localhost", 8080), timeout);

因为你在使用该方法时实际上已经将本地主机端口 8080 映射到远程主机端口session.setPortForwardingL(8080, rHost, rPort);

你可以试试这段代码

try {

            jsch.addIdentity(privateKeyPath);

            session = jsch.getSession(username, hostL, port);

            session.setConfig("PreferredAuthentications", "publickey,keyboard-interactive,password");

            session.setConfig("StrictHostKeyChecking", "no");

            session.connect();

            session.setPortForwardingL(8080, rHost, rPort);

            Socket s = new Socket();

            s.connect(new InetSocketAddress("localhost", 8080), timeout);

            session.disconnect();

        } catch (JSchException e) {

            e.printStackTrace();

        } catch (Exception e) {

            e.printStackTrace();

        }