(PHP Extension) Using sudo in an SSH Shell Session

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Demonstrates how to run a command as sudo in a shell session.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

include("chilkat_9_5_0.php");

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$ssh = new CkSsh();

$port = 22;
$success = $ssh->Connect('the-ssh-server.com',$port);
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Authenticate using login/password:
$success = $ssh->AuthenticatePw('theSshLogin','theSshPassword');
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Start a shell session.
// (The QuickShell method was added in Chilkat v9.5.0.65)
$channelNum = $ssh->QuickShell();
if ($channelNum < 0) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Construct a StringBuilder with our command ("ls") run with "sudo"
// Note: The line-endings are potentially important.  Some SSH servers may
// require either LF or CRLF line endings.  (Unix/Linux/OSX servers typically
// use bare-LF line endings.  Windows servers likely use CRLF line endings.)

// Using "sudo -S" causes the sudo prompt to be written to stderr,
// and the password is read from stdin (i.e. from the echo command ouput).
// The sudo commands -p option allows us to set the prompt, and we can set it to
// the empty string, thus eliminating the prompt from the stderr completely.
// This allows us to run the command as root (super-user) with no prompt.
$sbCommands = new CkStringBuilder();
$sbCommands->Append('echo \'theSshPassword\' | sudo -S -p \'\' ls\n');

// Add another command to echo a marker string that
// we'll use in ChannelReceiveUntilMatch below.
// The use of single quotes around 'IS' is a trick so that the output
// of the command is "THIS IS THE END OF THE SCRIPT", but the terminal echo
// includes the single quotes.  This allows us to read until we see the actual
// output of the last command.
$sbCommands->Append('echo THIS 'IS' THE END OF THE SCRIPT\n');

// Send the commands..
$success = $ssh->ChannelSendString($channelNum,$sbCommands->getAsString(),'ansi');
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Send an EOF to indicate no more commands will be sent.
// For brevity, we're not checking the return values of each method call.
// Your code should check the success/failure of each call.
$success = $ssh->ChannelSendEof($channelNum);

// Receive output up to our marker.
$success = $ssh->ChannelReceiveUntilMatch($channelNum,'THIS IS THE END OF THE SCRIPT','ansi',true);

// Close the channel.
// It is important to close the channel only after receiving the desired output.
$success = $ssh->ChannelSendClose($channelNum);

// Get any remaining output..
$success = $ssh->ChannelReceiveToClose($channelNum);

// Get the complete output for all the commands in the session.
print '--- output ----' . "\n";
print $ssh->getReceivedText($channelNum,'ansi') . "\n";

?>