通过 sshj 杀死进程

发布于 2024-12-03 02:32:44 字数 962 浏览 0 评论 0原文

我正在使用 sshj 并尝试尾随文件，但我的问题是远程进程永远不会被终止。

在下面的示例代码中，您可以看到我尝试跟踪 /var/log/syslog，然后向进程发送终止信号。但是，在应用程序停止并列出服务器上的所有进程后，我仍然可以看到活动的尾部进程。

为什么这段代码不会杀死进程？我能做些什么来弥补这个问题？

    SSHClient ssh = new SSHClient();
    ssh.addHostKeyVerifier(new PromiscuousVerifier());
    try {           
        ssh.connect("localhost");
        ssh.authPassword("xxx", "xxx");
        final Session session = ssh.startSession();
        try {
            final Command cmd = session.exec("tail -f /var/log/syslog");
            cmd.signal(Signal.KILL);
            System.out.println("\n** exit status: " + cmd.getExitStatus());
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            session.close();
        }
    } finally{
        ssh.disconnect();
    }

编辑

还尝试发送所有可用信号。

            for(Signal s : Signal.values()){
                cmd.signal(s);
            }

原文

Im using sshj and im trying to tail a file, but my problem is that the remote process is never killed.

In the following example code you can see that i try to tail /var/log/syslog, and then i send a kill signal to the process. However after the application has stopped and i list out all the processes on the server, i can still see an active tail process.

Why will not this code kill the process? and what can i do to remedy that?

    SSHClient ssh = new SSHClient();
    ssh.addHostKeyVerifier(new PromiscuousVerifier());
    try {           
        ssh.connect("localhost");
        ssh.authPassword("xxx", "xxx");
        final Session session = ssh.startSession();
        try {
            final Command cmd = session.exec("tail -f /var/log/syslog");
            cmd.signal(Signal.KILL);
            System.out.println("\n** exit status: " + cmd.getExitStatus());
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            session.close();
        }
    } finally{
        ssh.disconnect();
    }

EDIT

also tried sending all available signals.

            for(Signal s : Signal.values()){
                cmd.signal(s);
            }

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小嗷兮 2024-12-10 02:32:44

分配 PTY 并发送 Ctrl+C 字符代码对我来说很有效：

final Session session = ssh.startSession();
session.allocateDefaultPTY();
try {
    final Command cmd = session.exec("tail -f /var/log/syslog");

    // Send Ctrl+C (character code is 0x03):
    cmd.getOutputStream().write(3);
    cmd.getOutputStream().flush();

    // Wait some time for the process to exit:
    cmd.join(1, TimeUnit.SECONDS);

    // If no exception has been raised yet, then the process has exited
    // (but the exit status can still be null if the process has been killed).
    System.out.println("\n** exit status: " + cmd.getExitStatus());
} catch (IOException e) {
    e.printStackTrace();
}finally{
    session.close();
}

当然，能够发送信号会更好，但如果连 OpenSSH 服务器都不支持它，那就没有希望了：/

Allocating a PTY and sending a Ctrl+C character code did the trick for me:

final Session session = ssh.startSession();
session.allocateDefaultPTY();
try {
    final Command cmd = session.exec("tail -f /var/log/syslog");

    // Send Ctrl+C (character code is 0x03):
    cmd.getOutputStream().write(3);
    cmd.getOutputStream().flush();

    // Wait some time for the process to exit:
    cmd.join(1, TimeUnit.SECONDS);

    // If no exception has been raised yet, then the process has exited
    // (but the exit status can still be null if the process has been killed).
    System.out.println("\n** exit status: " + cmd.getExitStatus());
} catch (IOException e) {
    e.printStackTrace();
}finally{
    session.close();
}

Of course, being able to send signals would be better, but if even the OpenSSH server does not support it, there's no hope there :/

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