Waiting for command to finish using SSH2_Shell in PHP

I have an SSH2_Shell session working in PHP. my issue is that i need a command to completely finish before moving onto the next command. Here is my code so far:

    $command_capture = "cd /mnt/NADS/scripts/";
    $command_capture2 = "./tcpdump.sh $capture_name $sleep";


    if (!($connection = ssh2_connect("172.20.1.18", 22))) {
        echo "fail: unable to establish connection";
    } 
    if (!ssh2_auth_password($connection, "root", "Hideandseek")) {
        echo "fail: unable to authenticate";
    }
    $stream = ssh2_shell($connection);

    fwrite($stream, $command_capture. PHP_EOL);
    sleep(1);
    fwrite($stream, $command_capture2 . PHP_EOL);
    sleep(5);
    $data="";
    while($buf = stream_get_contents($stream)){
        $data.=$buf;
    }
    echo $data;
    fclose($stream);

the tcpdump.sh script is running a lftp command but is not being given anough time to complete. I cant use sleep as it may take longer then the specified time and i dont want to make the user wa开发者_运维知识库it if it only needs a few seconds. I have not had luck implementing stream_set_blocking as when i do, it seems to freeze up my browser.

overall, I need a way to detect when a command has finished and move into the next command.

Thanks in advance!

---

Thanks for the ideas but I think I got it solved. I did an echo of a few special characters when the command finished and then I would search for the characters using strpos(). Another thing I think may have helped was adjusting the max_execution_time setting in the php.ini file. I found that answer here:

http://verysimple.com/2006/03/30/fatal-error-maximum-execution-time-of-30-seconds-exceeded/

And here is my new code

    $data="";
    while (true){
        $data .= stream_get_contents($stream);
        if (strpos($data,"XOXO") !== false) {
            echo "okay: command finished\n";
            break;
        }
    }
    echo $data;
    fclose($stream);

---

I have an SSH2 class that implements the Secure Shell2 over on github .. check out https://github.com/bubba-h57/PHP-SSH2 and see if that helps.

I continue to search for a better way to handle finding the prompts though, so any advice or contribution to that would be welcomed. Hopefully it will help, if nothing more than giving you some ideas.

---

You could use phpseclib, a pure PHP SSH implementation. eg.

<?php
include('Net/SSH2.php');

$ssh = new Net_SSH2();
$ssh->login('username', 'password');

echo $ssh->exec('command');
echo $ssh->exec('command2');
?>

If you really need shell support you could do the following (with the latest SVN):

<?php
include('Net/SSH2.php');

$ssh = new Net_SSH2();
$ssh->login('username', 'password');

$ssh->read('[prompt]');
$ssh->write("command\n");
echo $ssh->read('[prompt]');
$ssh->write("command\n");
echo $ssh->read('[prompt]');
?>