PowerBuilder

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 added in Chilkat version 9.5.0.55 to accomplish this task.

PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Ssh1
oleobject loo_Ssh2
oleobject loo_Socket
integer li_UseTls
integer li_MaxWaitMillisec
string ls_ResponseStatusLine
string ls_ResponseHeaderLine
string ls_RemainderOfHeader

li_Success = 0

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

loo_Ssh1 = create oleobject
li_rc = loo_Ssh1.ConnectToNewObject("Chilkat.Ssh")
if li_rc < 0 then
    destroy loo_Ssh1
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Connect directly to the 1st SSH server.
li_Success = loo_Ssh1.Connect("serverssh1.com",22)
if li_Success <> 1 then
    Write-Debug loo_Ssh1.LastErrorText
    destroy loo_Ssh1
    return
end if

// Authenticate using login/password:
li_Success = loo_Ssh1.AuthenticatePw("ssh1Login","ssh1Password")
if li_Success <> 1 then
    Write-Debug loo_Ssh1.LastErrorText
    destroy loo_Ssh1
    return
end if

// 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.
loo_Ssh2 = create oleobject
li_rc = loo_Ssh2.ConnectToNewObject("Chilkat.Ssh")

li_Success = loo_Ssh2.ConnectThroughSsh(loo_Ssh1,"serverssh2.com",22)
if li_Success <> 1 then
    Write-Debug loo_Ssh2.LastErrorText
    destroy loo_Ssh1
    destroy loo_Ssh2
    return
end if

// Authenticate with ssh2...
li_Success = loo_Ssh2.AuthenticatePw("ssh2Login","ssh2Password")
if li_Success <> 1 then
    Write-Debug loo_Ssh2.LastErrorText
    destroy loo_Ssh1
    destroy loo_Ssh2
    return
end if

loo_Socket = create oleobject
li_rc = loo_Socket.ConnectToNewObject("Chilkat.Socket")

// 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
li_Success = loo_Socket.UseSsh(loo_Ssh2)
if li_Success <> 1 then
    Write-Debug loo_Socket.LastErrorText
    destroy loo_Ssh1
    destroy loo_Ssh2
    destroy loo_Socket
    return
end if

// Connect using TLS to www.chilkatsoft.com
// We could also tunnel a bare TCP connection by specifying port 80 with useTls = 0.
li_UseTls = 1
li_MaxWaitMillisec = 20000
li_Success = loo_Socket.Connect("www.chilkatsoft.com",443,li_UseTls,li_MaxWaitMillisec)
if li_Success <> 1 then
    Write-Debug loo_Socket.LastErrorText
    destroy loo_Ssh1
    destroy loo_Ssh2
    destroy loo_Socket
    return
end if

// 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.
loo_Socket.StringCharset = "utf-8"

// Send an HTTP HEAD request:
li_Success = loo_Socket.SendString("HEAD / HTTP/1.1~r~nHost: www.chilkatsoft.com~r~n~r~n")
if li_Success <> 1 then
    Write-Debug loo_Socket.LastErrorText
    destroy loo_Ssh1
    destroy loo_Ssh2
    destroy loo_Socket
    return
end if

// Wait a maximum of 4 seconds while no data is forthcoming:
loo_Socket.MaxReadIdleMs = 4000

// Get the 1st response line, which should be "HTTP/1.1 200 OK"
ls_ResponseStatusLine = loo_Socket.ReceiveToCRLF()
if loo_Socket.LastMethodSuccess <> 1 then
    Write-Debug loo_Socket.LastErrorText
    destroy loo_Ssh1
    destroy loo_Ssh2
    destroy loo_Socket
    return
end if

Write-Debug "StatusLine: " + ls_ResponseStatusLine

// Now get the 1st line of the response header:
ls_ResponseHeaderLine = loo_Socket.ReceiveToCRLF()
if loo_Socket.LastMethodSuccess <> 1 then
    Write-Debug loo_Socket.LastErrorText
    destroy loo_Ssh1
    destroy loo_Ssh2
    destroy loo_Socket
    return
end if

Write-Debug "HeaderLine: " + ls_ResponseHeaderLine

// Now read the remainder of the response header by reading until a double CRLF is seen:
ls_RemainderOfHeader = loo_Socket.ReceiveUntilMatch("~r~n~r~n")
if loo_Socket.LastMethodSuccess <> 1 then
    Write-Debug loo_Socket.LastErrorText
    destroy loo_Ssh1
    destroy loo_Ssh2
    destroy loo_Socket
    return
end if

Write-Debug "Remainder: " + ls_RemainderOfHeader

// Close the connection with the server.  This closes the tunnel through ssh2.
// Wait a max of 20 seconds (20000 millsec)
li_Success = loo_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.
loo_Ssh2.Disconnect()

loo_Ssh1.Disconnect()


destroy loo_Ssh1
destroy loo_Ssh2
destroy loo_Socket