(Perl) Multi-Hop SSH (SSH Through SSH)

Demonstrates how to SSH through one SSH server to get to another SSH server. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task. Technically, it should be possible to chain any number of servers using the ConnectThroughSsh multiple times:

Application => ServerSSH1 => ServerSSH2 ==> ServerSSH3 => ... => ServerSSHN

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

$ssh1 = chilkat::CkSsh->new();

# Hostname may be an IP address or domain name:
$hostname = "192.168.1.108";
$port = 22;

# Connect directly to the 1st SSH server:
$success = $ssh1->Connect($hostname,$port);
if ($success != 1) {
    print $ssh1->lastErrorText() . "\r\n";
    exit;
}

# Wait a max of 15 seconds when reading responses..
$ssh1->put_IdleTimeoutMs(15000);

# Authenticate using login/password:
$success = $ssh1->AuthenticatePw("myLogin","myPassword");
if ($success != 1) {
    print $ssh1->lastErrorText() . "\r\n";
    exit;
}

# Connect through the 1st SSH connection to reach a 2nd SSH server.
# Note: Any number of SSH connections may be simultaneously tunneled through a single
# existing SSH connection.
$ssh2 = chilkat::CkSsh->new();
$success = $ssh2->ConnectThroughSsh($ssh1,"someremoteserver.com",22);
if ($success != 1) {
    print $ssh2->lastErrorText() . "\r\n";
    exit;
}

$ssh2->put_IdleTimeoutMs(15000);

# Authenticate with ssh2...
$success = $ssh2->AuthenticatePw("myLogin2","myPassword2");
if ($success != 1) {
    print $ssh2->lastErrorText() . "\r\n";
    exit;
}

# The application may now is connected and authenticated with ssh2.
# The application can do whatever it desires just as if it was directly
# connected to ssh2.   For example, the application might open
# a session channel to send commands or start a remote shell..
$channelNum = $ssh2->OpenSessionChannel();
if ($channelNum < 0) {
    print $ssh2->lastErrorText() . "\r\n";
    exit;
}

# ...
# ...
# ...

# Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
# The connection with ssh1 is still alive, and may be used for more connections.
$ssh2->Disconnect();

# ...
# ...
# ...

$ssh1->Disconnect();