Perl Requires Chilkat v9.5.0.55+

TCP or TLS over Multiple Hop SSH to Remote Server

See more Socket/SSL/TLS Examples

Demonstrates how to use the Chilkat Socket API to connect to a remote server (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => DestinationServer

The ConnectThroughSsh and UseSsh methods are used to accomplish this task.

Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

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

my $ssh1 = Chilkat2::Ssh->new;

# Connect directly to the 1st SSH server.
my $success = $ssh1->Connect('serverssh1.com', 22);
if (!$success) {
    print $ssh1->LastErrorText, "\n";
    exit;
}

# Authenticate using login/password:
$success = $ssh1->AuthenticatePw('ssh1Login', 'ssh1Password');
if (!$success) {
    print $ssh1->LastErrorText, "\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.
my $ssh2 = Chilkat2::Ssh->new;
$success = $ssh2->ConnectThroughSsh($ssh1, 'serverssh2.com', 22);
if (!$success) {
    print $ssh2->LastErrorText, "\n";
    exit;
}

# Authenticate with ssh2...
$success = $ssh2->AuthenticatePw('ssh2Login', 'ssh2Password');
if (!$success) {
    print $ssh2->LastErrorText, "\n";
    exit;
}

my $socket = Chilkat2::Socket->new;

# Tell the socket object to connect to our destination server though the ssh2 tunnel (which itself is routed through ssh1).
# The connection looks like this:  ApplicationSocket(TLS) => ServerSSH1 => ServerSSH2 => DestinationServer
$success = $socket->UseSsh($ssh2);
if (!$success) {
    print $socket->LastErrorText, "\n";
    exit;
}

# Connect using TLS to www.chilkatsoft.com
# We could also tunnel a bare TCP connection by specifying port 80 with useTls = 0.
my $useTls = 1;
my $maxWaitMillisec = 20000;
$success = $socket->Connect('www.chilkatsoft.com', 443, $useTls, $maxWaitMillisec);
if (!$success) {
    print $socket->LastErrorText, "\n";
    exit;
}

# Once the multiple hop SSH tunneled connection is setup,  the socket programming
# is identical to the normal case where we have a direct connection.

# Tell the socket object that all text is to be sent in the utf-8 encoding,
# and the text received is assumed to be utf-8.
$socket->StringCharset('utf-8');

# Send an HTTP HEAD request:
$success = $socket->SendString("HEAD / HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n");
if (!$success) {
    print $socket->LastErrorText, "\n";
    exit;
}

# Wait a maximum of 4 seconds while no data is forthcoming:
$socket->MaxReadIdleMs(4000);

# Get the 1st response line, which should be "HTTP/1.1 200 OK"
my $responseStatusLine = $socket->ReceiveToCRLF();
if (!$socket->LastMethodSuccess) {
    print $socket->LastErrorText, "\n";
    exit;
}

print 'StatusLine: ', $responseStatusLine, "\n";

# Now get the 1st line of the response header:
my $responseHeaderLine = $socket->ReceiveToCRLF();
if (!$socket->LastMethodSuccess) {
    print $socket->LastErrorText, "\n";
    exit;
}

print 'HeaderLine: ', $responseHeaderLine, "\n";

# Now read the remainder of the response header by reading until a double CRLF is seen:
my $remainderOfHeader = $socket->ReceiveUntilMatch("\r\n\r\n");
if (!$socket->LastMethodSuccess) {
    print $socket->LastErrorText, "\n";
    exit;
}

print 'Remainder: ', $remainderOfHeader, "\n";

# Close the connection with the server.  This closes the tunnel through ssh2.
# Wait a max of 20 seconds (20000 millsec)
$success = $socket->Close(20000);

# 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();