PHP ActiveX

Run a Command on an SSH Session Channel

Demonstrates the Chilkat Ssh.SendReqExec method, which requests execution of a command on a session channel. The first argument is the channel number and the second is the command line. This example runs a command, reads the output until the channel closes, and prints it.

Background: exec is the workhorse for automation: run one command, collect its output, and finish — no interactive shell needed. Note carefully that a true return means the request was accepted, not that the command succeeded. To learn the command's outcome, read its output and check the channel exit status.

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<?php

$success = 0;

//  Demonstrates the Ssh.SendReqExec method, which requests execution of a command on a session
//  channel.  The 1st argument is the channel number and the 2nd is the command line.

$ssh = new COM("Chilkat.Ssh");

$sshPort = 22;
$success = $ssh->Connect('ssh.example.com',$sshPort);
if ($success == 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
$password = 'mySshPassword';

$success = $ssh->AuthenticatePw('mySshLogin',$password);
if ($success == 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

//  Open a session channel.  A negative return value indicates failure.
$channelNum = $ssh->OpenSessionChannel();
if ($channelNum < 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

//  Request execution of a command.  A 1 return means the server accepted the request; it
//  does not mean the command itself succeeded.
$success = $ssh->SendReqExec($channelNum,'ls -l /tmp');
if ($success == 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

//  IMPORTANT: Set a read timeout.  ReadTimeoutMs defaults to 0, which means no limit -- without
//  it, this call waits forever if the server never sends channel close.
$ssh->ReadTimeoutMs = 15000;

//  Read the command output until the server closes the channel.
$success = $ssh->ChannelReceiveToClose($channelNum);
if ($success == 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

$output = $ssh->getReceivedText($channelNum,'utf-8');
if ($ssh->LastMethodSuccess == 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

print $output . "\n";

$ssh->Disconnect();

?>