PowerBuilder

SSH Tunnel with Dynamic Port Forwarding

See more SSH Examples

Demonstrates how to start a background thread that runs a portable SSH tunnel w/ dynamic port forwarding that the foreground thread can use for establishing connections through an SSH tunnel. PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Tunnel
string ls_SshHostname
integer li_SshPort
string ls_Url
oleobject loo_Http
string ls_Html
integer li_WaitForThreadExit

li_Success = 0

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

li_Success = 0

loo_Tunnel = create oleobject
li_rc = loo_Tunnel.ConnectToNewObject("Chilkat.SshTunnel")
if li_rc < 0 then
    destroy loo_Tunnel
    MessageBox("Error","Connecting to COM object failed")
    return
end if

ls_SshHostname = "sftp.example.com"
li_SshPort = 22

// Connect to an SSH server and establish the SSH tunnel:
li_Success = loo_Tunnel.Connect(ls_SshHostname,li_SshPort)
if li_Success <> 1 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    return
end if

// Authenticate with the SSH server via a login/password
// or with a public key.  
// This example demonstrates SSH password authentication.
li_Success = loo_Tunnel.AuthenticatePw("mySshLogin","mySshPassword")
if li_Success <> 1 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    return
end if

// Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server
// with dynamic port forwarding:
loo_Tunnel.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.

loo_Tunnel.InboundSocksUsername = "chilkat123"
loo_Tunnel.InboundSocksPassword = "password123"

// Start the listen/accept thread to begin accepting SOCKS proxy client connections.
// Listen on port 1080.
li_Success = loo_Tunnel.BeginAccepting(1080)
if li_Success <> 1 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    return
end if

// 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 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.

// For this example, let's do a simple HTTPS request:
ls_Url = "https://www.ethereum.org/"

loo_Http = create oleobject
li_rc = loo_Http.ConnectToNewObject("Chilkat.Http")

// Indicate that the HTTP object is to use our portable SOCKS proxy/SSH tunnel running in our background thread.
loo_Http.SocksHostname = "localhost"
loo_Http.SocksPort = 1080
loo_Http.SocksVersion = 5
loo_Http.SocksUsername = "chilkat123"
loo_Http.SocksPassword = "password123"

loo_Http.SendCookies = 1
loo_Http.SaveCookies = 1
loo_Http.CookieDir = "memory"

// Do the HTTPS page fetch (through the SSH tunnel)
ls_Html = loo_Http.QuickGetStr(ls_Url)
if loo_Http.LastMethodSuccess <> 1 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_Tunnel
    destroy loo_Http
    return
end if

// Stop the background listen/accept thread:
li_WaitForThreadExit = 1
li_Success = loo_Tunnel.StopAccepting(li_WaitForThreadExit)
if li_Success <> 1 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    destroy loo_Http
    return
end if

// Close the SSH tunnel (would also kick any remaining connected clients).
li_Success = loo_Tunnel.CloseTunnel(li_WaitForThreadExit)
if li_Success <> 1 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    destroy loo_Http
    return
end if



destroy loo_Tunnel
destroy loo_Http