SSH Exec (Execute Command Line)

Shows how to execute a command on an SSH server and retrieve the command output.

 Chilkat Perl Module Downloads for Windows, Linux, and MAC OS X

use chilkat();

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

$ssh = new chilkat::CkSsh();

#  Any string automatically begins a fully-functional 30-day trial.
$success = $ssh->UnlockComponent("Anything for 30-day trial");
if ($success != 1) {
    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 != 1) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

#  Wait a max of 5 seconds when reading responses..
$ssh->put_IdleTimeoutMs(5000);

#  Authenticate using login/password:
$success = $ssh->AuthenticatePw("myLogin","myPassword");
if ($success != 1) {
    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;
}

#  The SendReqExec method starts a command on the remote
#  server.   The syntax of the command string depends on the
#  default shell used on the remote server to run the command.
#  On Windows systems it is CMD.EXE.  On UNIX/Linux
#  systems the user's default shell is typically defined in /etc/password.

#  Here are some examples of command lines for <b>Windows SSH servers</b>:

#  Get a directory listing:
$cmd1 = "dir";

#  Do a nameserver lookup:
$cmd2 = "nslookup chilkatsoft.com";

#  List a specific directory.  Given that the shell is CMD.EXE, backslashes must
#  be used:
$cmd3 = "dir \\temp";

#  Execute a sequence of commands.  The syntax for CMD.EXE may be found
#  here: http://technet.microsoft.com/en-us/library/bb490880.aspx.  Notice how the commands
#  are separated by "&&" and the entire command must be enclosed in quotes:
$cmd4 = "\"cd \\temp&&dir\"";

#  Here are two examples of command lines for <b>Linux/UNIX SSH servers</b>:

#  Get a directory listing:
$cmd5 = "ls -l /tmp";

#  Run a series of commands (syntax may depend on your default shell):
$cmd6 = "cd /etc; ls -la";

#  Request a directory listing on the remote server:
#  If your server is Windows, change the string from "ls" to "dir"
$success = $ssh->SendReqExec($channelNum,"ls");
if ($success != 1) {
    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 != 1) {
    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 != 1) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

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

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

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

#  Disconnect
$ssh->Disconnect();