JSch如何作为我切换到的用户发出命令[英] JSch - How to issue commands as the user I have switched to

问题描述

我正在使用 Jsch 从 Windows 7 远程连接到 Linux 服务器.

我不得不

(i) login to Linux server with my credentials 
(ii) switch to root using a pmrun command [this is the procedure in our environment], and
(iii) execute su command to switch as "someuser"
(iv) execute further commands as that "someuser"

我完成了步骤 (i) 和 (ii).

完成步骤 (ii) 后,来自频道的 InputStream 将命令提示符显示为 root 用户的命令提示符.所以我假设我现在已经成为root用户了.

现在,我是否需要获取 root 用户的会话才能进一步执行 su 命令,或者有没有办法以 root 用户身份执行进一步的命令?

请有人帮忙.谢谢.

更新:源代码

public class Pmrun {

    public static void main(String[] arg){
        try{
            JSch jsch=new JSch();

            String host=null;
            if(arg.length>0){
                host=arg[0];
            }
            else{
                host="myself@linuxserver.com";
            }
            String user=host.substring(0, host.indexOf('@'));
            host=host.substring(host.indexOf('@')+1);

            Session session=jsch.getSession(user, host, 22);

            UserInfo ui=new MyUserInfo();
            session.setUserInfo(ui);
            session.connect();

            String command=  "pmrun su -";

            Channel channel=session.openChannel("exec");

            ((ChannelExec)channel).setCommand(command);

            InputStream in = channel.getInputStream();
            OutputStream outStream = channel.getOutputStream();
            ((ChannelExec)channel).setPty(true);
            ((ChannelExec)channel).setErrStream(System.err);

            channel.connect();
            TimeUnit.SECONDS.sleep(10);
            outStream.write("xxxxxxx\n".getBytes());
            outStream.flush();

            ((ChannelExec)channel).setCommand("su - someuser");


            byte[] tmp=new byte[1024];
            while(true){
                while(in.available()>0){
                    int i=in.read(tmp, 0, 1024);
                    if(i<0)break;
                    System.out.print(new String(tmp, 0, i));
                }
                if(channel.isClosed()){
                    System.out.println("exit-status: "+channel.getExitStatus());
                    break;
                }
                try{Thread.sleep(1000);}catch(Exception ee){}
            }
            channel.disconnect();
            session.disconnect();
        }
        catch(Exception e){
            System.out.println(e);
        }
    }

    public static class MyUserInfo implements UserInfo{
        public String getPassword(){ return passwd; }
        public boolean promptYesNo(String str){
            str = "Yes";
            return true;}

        String passwd;

        public String getPassphrase(){ return null; }
        public boolean promptPassphrase(String message){ return true; }
        public boolean promptPassword(String message){
            passwd="zzzzzzzz";
            return true;
        }
        public void showMessage(String message){

        }

    }


}

推荐答案

扩展@Martin 的答案,另一种解决方案是以"shell"模式打开通道以维持会话.像这样……

Channel channel = session.openChannel("shell")

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