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 session channel. This is not a separate TCP/IP connection -- it's simply a new session channel on the existing connection. The sequence of Chilkat SSH calls would look like this:

Connect
AuthenticatePw (or AuthenticatePk)

OpenSessionChannel
SendReqExec
<retrieve command output...>
SendChannelClose
ChannelReceiveToClose (to make sure all remaining output is received)

OpenSessionChannel
SendReqExec
<retrieve command output...>
SendChannelClose
ChannelReceiveToClose (to make sure all remaining output is received)

...

OpenSessionChannel
SendReqExec
<retrieve command output...>
SendChannelClose
ChannelReceiveToClose (to make sure all remaining output is received)

Disconnect

Download Chilkat 32-bit SSH / SFTP ActiveX (.msi)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

<?php

//  Important: It is helpful to send the contents of the
//  ssh.LastErrorText property when requesting support.

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

//  Any string automatically begins a fully-functional 30-day trial.
$success = $ssh->UnlockComponent('Anything for 30-day trial');
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

//  Connect to an SSH server:

//  Hostname may be an IP address or hostname:
$hostname = '192.168.1.108';
$port = 22;

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

//  Wait a max of 5 seconds when reading responses..
$ssh->IdleTimeoutMs = 5000;

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

//  Let's pickup the accumulated output of the command:

$cmdOutput = $ssh->getReceivedText($channelNum,'ansi');
if (is_null($cmdOutput)) {
    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' . $lf;
$success = $ssh->SendReqExec($channelNum,$cmd);
if ($success != true) {
    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 != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

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

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

print $cmdOutput . "\n";

//  Disconnect
$ssh->Disconnect();
?>