PHP Extension

Multiple SendReqExec on Same Connection

Shows how to execute a series of commands on an SSH server and retrieve each command's output (using SendReqExec). Each call to SendReqExec requires its own logical channel. This is not a separate SSH connection -- it's simply a new session channel on the existing SSH connection. PHP Extension

<?php

include("chilkat.php");

$success = false;

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

$ssh = new CkSsh();

// Hostname may be an IP address or domain:
$hostname = '172.16.16.46';
$port = 22;

$success = $ssh->Connect($hostname,$port);
if ($success == false) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// If receiving output from a command stalls for more than 5 seconds, then stop waiting.
$ssh->put_IdleTimeoutMs(5000);

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

// Open a session channel.  (It is possible to have multiple
// session channels open simultaneously.)
$channelNum = $ssh->OpenSessionChannel();
if ($channelNum < 0) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Request a directory listing on the remote server:
// If your server is Linux/UNIX, change the string from "dir" to "ls"
// Note: Some SSH servers require a CRLF instead of a bare-LF
$cmd = 'ls -al\n';
$success = $ssh->SendReqExec($channelNum,$cmd);
if ($success == false) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Read whatever output may already be available on the
// SSH connection.  ChannelReadAndPoll returns the number of bytes
// that are available in the channel's internal buffer that
// are ready to be "picked up" by calling GetReceivedText
// or GetReceivedData.
// A return value of -1 indicates failure.
// A return value of -2 indicates a failure via timeout.

// The ChannelReadAndPoll method waits
// for data to arrive on the connection usingi the IdleTimeoutMs
// property setting.  Once the first data arrives, it continues
// reading but instead uses the pollTimeoutMs passed in the 2nd argument:
// A return value of -2 indicates a timeout where no data is received.
$pollTimeoutMs = 2000;
$n = $ssh->ChannelReadAndPoll($channelNum,$pollTimeoutMs);
if ($n < 0) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Close the channel:
$success = $ssh->ChannelSendClose($channelNum);
if ($success == false) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Perhaps we did not receive all of the commands output.
// To make sure,  call ChannelReceiveToClose to accumulate any remaining
// output until the server's corresponding "channel close" is received.
$success = $ssh->ChannelReceiveToClose($channelNum);
if ($success == false) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Get the accumulated output of the command:

$cmdOutput = $ssh->getReceivedText($channelNum,'ansi');
if ($ssh->get_LastMethodSuccess() == false) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Display the remote shell's command output:
print $cmdOutput . "\n";
print '----' . "\n";

// -----------------------------------------------------------------
// Now for the 2nd SendReqExe (on the same connection,
// but on a separate logical channel).
// -----------------------------------------------------------------

$channelNum = $ssh->OpenSessionChannel();
if ($channelNum < 0) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

$cmd = 'nslookup chilkatsoft.com\n';
$success = $ssh->SendReqExec($channelNum,$cmd);
if ($success == false) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

$pollTimeoutMs = 2000;
$n = $ssh->ChannelReadAndPoll($channelNum,$pollTimeoutMs);
if ($n < 0) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

$success = $ssh->ChannelSendClose($channelNum);
if ($success == false) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

$success = $ssh->ChannelReceiveToClose($channelNum);
if ($success == false) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

$cmdOutput = $ssh->getReceivedText($channelNum,'ansi');
if ($ssh->get_LastMethodSuccess() == false) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

print $cmdOutput . "\n";

?>