Open a Forwarded Channel through an SSH Tunnel

See more Socket/SSL/TLS Examples

Demonstrates Socket.SshNewChannel, which opens a port-forwarded channel through an authenticated SSH tunnel to a destination host and port, populating a Socket with the connected channel.

load ./chilkat.dll

set success 0

set socket [new_CkSocket]

#  Connect to the SSH server and initialize an SSH tunneling session.  Port 22 is conventional but
#  not required.
set success [CkSocket_SshOpenTunnel $socket "ssh.example.com" 22]
if {$success == 0} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

#  Authenticate the SSH session before opening forwarded channels.
#  The SSH password should come from a secure source rather than being hard-coded.
set sshPassword "mySshPassword"
set success [CkSocket_SshAuthenticatePw $socket "sshUser" $sshPassword]
if {$success == 0} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

#  Open a port-forwarded channel through the authenticated SSH tunnel to the destination host and
#  port, populating a Socket with the connected channel.  Set the 3rd argument to 1 to establish
#  TLS to the destination inside the tunnel.
set bTls 0
set maxWaitMs 20000
set channel [new_CkSocket]

set success [CkSocket_SshNewChannel $socket "db.internal" 5432 $bTls $maxWaitMs $channel]
if {$success == 0} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    delete_CkSocket $channel
    exit
}

#  Use the channel socket to send and receive with the destination through the tunnel.
puts "Forwarded channel opened to the destination."

delete_CkSocket $socket
delete_CkSocket $channel