通过Jsch端口转发进行Java套接字连接

时间:2019-06-01 00:43:57

标签: java

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

尝试通过端口转发来实现这一目标,但不断       IllegalStateException:无法连接到rHost 错误。
我测试了远程主机确实直接接受连接,而我的用例是通过SSHhost连接。

不确定哪里出了问题,或者我愿意接受其他方法或建议?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 );
    }

1 个答案:

答案 0 :(得分:1)

您需要更改以下行

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

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

因为使用方法session.setPortForwardingL(8080, rHost, rPort);时,实际上已将本地主机端口8080映射到远程主机端口

您可以尝试使用此代码

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();
        }