ssh2_shell

tsschulz at gmx dot net (2011-01-11 08:07:30)

In my case the ssh2_shell doesn't work every time. There were many problems:
- If I use stream_get_contents, the command(s) never executed
- with while ($buf = fgets...) the loop never stops
- without sleep(1) before stream_set_blocking, the command wasn't execute every time. Anyone knows why?
That's what I made, and it works - but I think it isn't what it should be:
<?php
        $strCommand = 'tar -C /path/to/extract -xjf /path/from/file.tar.bz2';
        $sshStream = ssh2_shell($this->sshSession, 'xterm', null, 120, 24, SSH2_TERM_UNIT_CHARS); 
        fwrite($sshStream, $strCommand . PHP_EOL);
        sleep(1);
        stream_set_blocking($sshStream, true);
        $sshUntarRetval = "";
        while ($buf = fgets($sshStream,4096)) {
        flush();
            $sshUntarRetval .= $buf;
            if (strpos($buf, 'tar -C') !== false)
            {
                break;
            }
        }
        fclose($sshStream);
?>

stefanov at uk dot ibm dot com (2008-05-02 08:26:10)

Do not use \n to end the command. Some server will fail to process. Use always the standard for PHP end of line: PHP_EOL

'suri at suribala dot com"'s example should be modified as follows (also change the double quotes to single, for better performance):

<?php

$con=ssh2_connect('192.168.0.1', 22);
ssh2_auth_password($con, 'user', 'password');
$shell=ssh2_shell($con, 'xterm');
fwrite( $shell, 'cd /dir_one;'.PHP_EOL);
fwrite( $shell, 'ls -la;'.PHP_EOL);
fwrite( $shell, 'cd /dir_two;'.PHP_EOL);
fwrite( $shell, 'ls -la;'.PHP_EOL);

?>

Cheers,

Pimmy

josh at hydril dot com (2007-07-12 16:49:15)

To run a shell script with all the variables that you would have when logged in interactively add bash -l or sh --login infront of your command.  The script I use creates a shell script, copies the script to the box with ssh2_scp_send, then executes the script with ssh2_exec.  Hope this helps somebody.

<?php

//Example

$script1 = "bash -l /etc/rc.d/rc.httpd restart";

$connection = ssh2_connect('shell.example.com', 22);
ssh2_auth_password($connection, 'username', 'password');

$stream = ssh2_exec($connection, $script1);
?>

vgopu1 at gmail dot com (2007-07-09 01:17:41)

Hi,
we could also use shell_exec to execute multiple related commands
separated by semicolon (;).
And I figured out problem that sometimes arise related to the execution of complex java c/c++ programs. All we need to do is to set the required environment variables. I have a environment variable in .bash_profile. This variable would be set when I log into my account normally through shell. But when we use ssh2_connect(), the environment variables in the .bash_profile are not set, all we need to do is export the required environment variables with shell_exec();
example:
$conn = ssh2_connect($ipaddress);
ssh2_auth_password($conn,$username,$passwd);
$cmd1="/path/to/program1";
$cmd2="/path/to/program2";
$env1="export Variable_name1=path1";
$env2="export Variable_name2=path2"
$stream = ssh2_exec($connection,"$env1; $env2; $cmd1; $cmd2");//this would execute all the //commands and return
// stream
stream_set_blocking($stream, true);
while($o=fgets($stream)){
echo $o.'<br>';
}
...
...
Thanks,
Vikram Gopu .
http:\\my.lsu.edu/vgopu1

johnes at netsite dot com dot br (2007-02-16 09:27:57)

Instead of using sleep(1) try using usleep(350000). If not, you will need to spend much time unnecessary. In my scripts, I tried to use usleep(250000), but it's too short and brought some problems. usleep(300000) worked, but only to garantee use 350000. ;)

galvao at galvao dot eti dot br (2006-12-18 09:03:23)

In response to webmaster at spectreanime dot com:
"For some obscur reasons, just after ur command, u need to make a sleep to be sure, that the command has reached the server and is running"
Actually what you must do is set the blocking of the string to true, so it waits until the server sends data to the STDOUT before echoing it.
So, instead of:
sleep(1);
Just do:
stream_set_blocking($stdio, true);
Best regards,

webmaster at spectreanime dot com (2005-06-08 01:38:59)

// Connection to SSH server
echo "Connexion SSH ";
if (!($resource=@ssh2_connect("192.168.0.1"))) {
echo "[FAILED]<br />";
exit(1);
}
echo "[OK]<br />";

// Authentification by login/passwd
echo "Authentification ";
if (!@ssh2_auth_password($resource,"root","your_password")) {
echo "[FAILED]<br />";
exit(1);
}
echo "[OK]<br />";

// We need a shell
echo "Shell stdio ";
if (!($stdio = @ssh2_shell($resource,"xterm"))) {
echo "[FAILED]<br />";
exit(1);
}
echo "[OK]<br />";

// Execution of any command
// Be careful to add an '\n' at the end of the command
$command = "/bin/ls /tmp\n";
fwrite($stdio,$command);

// IMPORTANT
// For some obscur reasons, just after ur command, u need to make a sleep to be sure, that the command has reached the server and is running
sleep(1);

// Then u can fetch the stream to see what happens on stdio
while($line = fgets($stdio)) {
flush();
echo $line."<br />";
}

// It's always cleaner to close all stream
fclose($stdio);
I truly hope i'll help someone :)

suri at suribala dot com (2005-02-14 05:03:29)

Using ssh_exec, one could execute only one command at a time. However, ssh_shell, offers greater flexibility.

Here is an example:

<?php

$con=ssh2_connect('192.168.0.1', 22);
ssh2_auth_password($con, "user", "password");
$shell=ssh2_shell($con, 'xterm');
fwrite( $shell, "cd /dir_one\n");
fwrite( $shell, "ls -la\n");
fwrite( $shell, "cd /dir_two\n");
fwrite( $shell, "ls -la\n");

?>

Thanks Sara for your implementation and your help !