使用JSch sudo示例和Channel.setPty在远程主机上运行sudo命令 [英] Use JSch sudo example and Channel.setPty for running sudo command on remote host
问题描述
我在以下链接中使用了JSch Sudo示例:
I have used JSch Sudo example under following link:
http://www.jcraft.com/jsch/examples/Sudo.java.html
并更改它有点摆脱所有对话框,因为我必须使用PuTTY将它用于EC2实例。
And changed it a bit and get rid of all the dialogs as I have to use it for EC2 instances using PuTTY.
现在我的代码如下所示:
Now my code looks like this:
import com.jcraft.jsch.*;
import java.awt.*;
import javax.swing.*;
import java.io.*;
public class sudo{
public static void main(String[] arg){
try{
JSch jsch=new JSch();
String host=null;
if(arg.length>0){
host=arg[0];
}
String privateKey = "my private key.pem";
jsch.addIdentity(privateKey, "");
Session session=jsch.getSession("ec2-user", "xx.xx.xx.xx", 22);
session.setPassword("");
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
String command="sudo mkdir /data";
String sudo_pass="";
Channel channel=session.openChannel("exec");
// man sudo
// -S The -S (stdin) option causes sudo to read the password from the
// standard input instead of the terminal device.
// -p The -p (prompt) option allows you to override the default
// password prompt and use a custom one.
((ChannelExec)channel).setCommand("sudo -S -p '' "+command);
InputStream in=channel.getInputStream();
OutputStream out=channel.getOutputStream();
((ChannelExec)channel).setErrStream(System.err);
channel.connect();
out.write((sudo_pass+"\n").getBytes());
out.flush();
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);
}
}
}
但我收到错误
对不起你必须有一个tty来运行sudo
sorry you must have a tty to run sudo
我也尝试使用((ChannelExec)频道).setPty(true)
但是我可以运行一次但是下一次,对于相同的EC2实例,我得到以下错误,但对于新实例,它第一次工作正常。
I also tried to use ((ChannelExec) channel).setPty(true)
but I can run the program once but next time, for same EC2 instance, I get the following error but for new instance it works fine for first time again.
com.jcraft.jsch.JSchException: Session.connect: java.io.IOException: End of IO Stream Read
sudo mkdir /data
Exception in thread "main" com.jcraft.jsch.JSchException: session is down
at com.jcraft.jsch.Session.openChannel(Session.java:791)
那么我也不能从命令行ssh远程主机。
And then also I could not ssh the remote host from command line as well.
有人可以指导我在远程主机上运行 sudo
命令需要做什么。
Can someone please guide me that what I need to do to run sudo
command on remote host.
推荐答案
我正在处理的项目中有类似的代码,并且遇到了同样的错误。我使用 setPty(true)
解决了这个问题。
I have similar code in a project I am working on, and was getting the same error. I resolved this using the setPty(true)
as you did.
我认为你收到此错误是因为你没有关闭代码中的流。如果您使用的是Java 1.7,则可以按如下方式使用资源块:
I think you're getting this error because you don't close out the streams in your code. If you are using Java 1.7, you can use a resource block as follows:
try( InputStream in=channel.getInputStream() ) {
try( OutputStream out = channel.getOutputStream() ) {
...
}
}
或来自过去版本的try ... finally块模式。
or the try...finally block pattern from past versions.
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