(Perl) FTP through SSH Tunnel

Demonstrates how to FTP through an SSH tunnel.

The Chilkat SSH tunnel object is used to create a portable SSH tunnel w/ dynamic port forwarding on a background thread that the foreground thread can use for establishing connections through an SSH tunnel.

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

use chilkat();

# Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
# by calling UnlockBundle.  It requires a Bundle unlock code.
$chilkatGlob = chilkat::CkGlobal->new();
$success = $chilkatGlob->UnlockBundle("Anything for 30-day trial.");
if ($success != 1) {
    print $chilkatGlob->lastErrorText() . "\r\n";
    exit;
}

# This example requires Chilkat version 9.5.0.50 or greater.
$tunnel = chilkat::CkSshTunnel->new();

$sshHostname = "www.my-ssh-server.com";
$sshPort = 22;

# Connect to an SSH server and establish the SSH tunnel:
$success = $tunnel->Connect($sshHostname,$sshPort);
if ($success != 1) {
    print $tunnel->lastErrorText() . "\r\n";
    exit;
}

# Authenticate with the SSH server via a login/password
# or with a public key.  
# This example demonstrates SSH password authentication.
$success = $tunnel->AuthenticatePw("mySshLogin","mySshPassword");
if ($success != 1) {
    print $tunnel->lastErrorText() . "\r\n";
    exit;
}

# Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server
# with dynamic port forwarding:
$tunnel->put_DynamicPortForwarding(1);

# We may optionally require that connecting clients authenticate with our SOCKS proxy server.
# To do this, set an inbound username/password.  Any connecting clients would be required to 
# use SOCKS5 with the correct username/password.
# If no inbound username/password is set, then our SOCKS proxy server will accept both
# SOCKS4 and SOCKS5 unauthenticated connections.

$tunnel->put_InboundSocksUsername("chilkat123");
$tunnel->put_InboundSocksPassword("password123");

# Start the listen/accept thread to begin accepting SOCKS proxy client connections.
# Listen on port 1080.
$success = $tunnel->BeginAccepting(1080);
if ($success != 1) {
    print $tunnel->lastErrorText() . "\r\n";
    exit;
}

# Now that a background thread is running a SOCKS proxy server that forwards connections
# through an SSH tunnel, it is possible to use any Chilkat implemented protocol that is SOCKS capable,
# such as Socket, HTTP, POP3, SMTP, IMAP, FTP, etc.  The protocol may use SSL/TLS because the SSL/TLS
# will be passed through the SSH tunnel to the end-destination.  Also, any number of simultaneous
# connections may be routed through the SSH tunnel.

# Let's do an FTP upload through the SSH tunnel.  Both the control and data connections 
# go through the tunnel.
$ftp = chilkat::CkFtp2->new();

$ftp->put_Hostname("ftp.example.com");
$ftp->put_Username("login");
$ftp->put_Password("password");

# Indicate that the FTP2 object is to use our portable SOCKS proxy/SSH tunnel running in our background thread.
$ftp->put_SocksHostname("localhost");
$ftp->put_SocksPort(1080);
$ftp->put_SocksVersion(5);
$ftp->put_SocksUsername("chilkat123");
$ftp->put_SocksPassword("password123");

# Connect to the FTP server
$success = $ftp->ConnectOnly();
if ($success != 1) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

# Authenticate with the FTP server.
$success = $ftp->LoginAfterConnectOnly();
if ($success != 1) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

# Change to the remote directory where the file will be uploaded.
$success = $ftp->ChangeRemoteDir("junk");
if ($success != 1) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

# Upload a file.
$localPath = "/temp/hamlet.xml";
$remoteFilename = "hamlet.xml";

$success = $ftp->PutFile($localPath,$remoteFilename);
if ($success != 1) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

# This closes the SSH channel within the SSH tunnel,
# and thus closes the connection with the FTP server.
$success = $ftp->Disconnect();

print "File Uploaded!" . "\r\n";

# Stop the background listen/accept thread:
$waitForThreadExit = 1;
$success = $tunnel->StopAccepting($waitForThreadExit);
if ($success != 1) {
    print $tunnel->lastErrorText() . "\r\n";
    exit;
}

# Close the SSH tunnel (would also kick any remaining connected clients).
$success = $tunnel->CloseTunnel($waitForThreadExit);
if ($success != 1) {
    print $tunnel->lastErrorText() . "\r\n";
    exit;
}