Need to automate SSH commands to router
<p>I need to find a way to automate ssh commands to my router. My goal is to make the router restart whenever I run the script from my Java program. I'm having some issues though. </p>

<p>First of all, this is the sequence of output I get from my router's ssh:
First I do:</p>

<pre><code>ssh root@192.168.100.1
</code></pre>

<p>which returns:</p>

<pre><code>root@192.168.100.1's password: 
</code></pre>

<p>I enter the password, "admin". It then goes to this prompt:</p>

<pre><code>Welcome Visiting Huawei Home Gateway
Copyright by Huawei Technologies Co., Ltd.

Password is default value, please modify it!
WAP&gt;
</code></pre>

<p>Now, I input "reset" and it restarts the router.</p>

<p>I've tried Tcl with Expect and while I can get it working on Windows, it doesn't work on Linux. Here's my code for the Tcl script:</p>

<pre><code>#!/bin/sh
# \ exec tclsh "$0" ${1+"$@"}
package require Expect
spawn ssh root@192.168.100.1
send "admin\r"
send "reset\r"
after 3000
exit
</code></pre>

<p>Whenever I try to execute it, Tcl8.6 runs through it and terminates without actually doing anything. However, if I manually input all of these commands while running Tcl8.6, it works just fine</p>

<p>I've also tried the JSch Java library. With that, I can get the Java program to connect and output the shell of the router, but any command that I try to send does nothing. Here's the code from that:</p>

<pre><code>    ...
JSch jsch = new JSch();

        Session session = jsch.getSession("root", "192.168.100.1", 22);

        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config);

        // Skip prompting for the password info and go direct...
        session.setPassword("admin");
        session.connect();

        String command = "reset\r";

        Channel channel = session.openChannel("exec");
        ((ChannelExec) channel).setCommand(command);

        ((ChannelExec) channel).setErrStream(System.err);

        InputStream in = channel.getInputStream();

        System.out.println("Connect to session...");
        channel.connect();


        byte[] tmp = new byte[1024];
        while (true) {
            while (in.available() &gt; 0) {
                int i = in.read(tmp, 0, 1024);
                if (i &lt; 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();
        System.out.println("disconnected");
</code></pre>

<p>This is the output that I get:</p>

<pre><code>Connect to session...

Welcome Visiting Huawei Home Gateway
Copyright by Huawei Technologies Co., Ltd.

Password is default value, please modify it!
WAP&gt;
</code></pre>

<p>It just stays here until I exit. The router doesn't restart. I've also tried:</p>

<pre><code>String command = "reset";
</code></pre>

<p>but it does the same thing. Anybody know of any other ways I could do this?</p>