Hi,
My apologies if this a repetitive post. I searched for similar
issues and couldn't find any in the forum. However, I could have missed.
I have a usecase where I would want to programmatically fire a bunch of
commands one after the other to a router which is SSH enabled in a
single session.
I tried the following implementation
* Maintaining a single session, I created a new channel of type
"exec" for every command sent, but when it came to creating the second
channel, I got an exception that the session got disconnected although I
never disconnected the session. Please advise how I can rectify this. I
do not want to create a session everytime a new command is sent. Would
using shell help? If so, how could I implement it.
public void initSession() {
JSch jsch = new JSch();
String host = "10.10.10.10";
String username = "abc";
String password = "abc123";
try {
session = jsch.getSession(username, host, 22);
session.setPassword(password);
java.util.Properties config = new
java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.setPassword(password);
session.connect();
} catch (Exception e) {
e.printStackTrace();
}
}
public void disconnectSession(){
session.disconnect();
}
public void runCommand(String command) {
try {
Channel channel = session.openChannel("exec");
channel.setInputStream(null);
channel.setOutputStream(System.out);
((ChannelExec) channel).setCommand(command);
channel.connect();
InputStream in = channel.getInputStream();
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();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
String command = "sh flash";
TestSSH test = new TestSSH();
test.initSession();
test.runCommand("sh ip route");
test.runCommand("sh flash");
test.disconnectSession();
}
Thanks in Advnace,
Vinay
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