PowerBuilder

SSH Tunnel (Port Forwarding via direct-tcpip channel)

See more SSH Examples

Demonstrates how to create an SSH tunnel to a remote hostname:port via a direct-tcpip channel. PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Ssh
string ls_Hostname
integer li_Port
integer li_ChannelNum
string ls_HttpReq
integer li_CaseSensitive
string ls_MatchStr
string ls_ResponseHeader
integer li_NumBytesRead
integer li_PollTimeoutMs
string ls_HtmlBody

li_Success = 0

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

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

// Connect to an SSH server:

// Hostname may be an IP address or hostname:
ls_Hostname = "192.168.1.117"
li_Port = 22

li_Success = loo_Ssh.Connect(ls_Hostname,li_Port)
if li_Success <> 1 then
    Write-Debug loo_Ssh.LastErrorText
    destroy loo_Ssh
    return
end if

// Wait a max of 5 seconds when reading responses..
loo_Ssh.IdleTimeoutMs = 5000

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

// Open a direct-tcpip channel.  We want the SSH server to connect
// to www.chilkatsoft.com, port 80 (i.e. the web server).
// Data sent through the SSH tunnel is forwarded to the remote
// host:port.  (Note: The remote host:port does not need to be 
// a web server.  It can be anything.  It can be your own
// customer application server that listens on a port, or any
// other type of server.)
// When we read from the SSH channel, we'll be reading data
// sent from the remote host:port (i.e. the web server in this
// example).

li_ChannelNum = loo_Ssh.OpenDirectTcpIpChannel("www.chilkatsoft.com",80)
if li_ChannelNum < 0 then
    Write-Debug loo_Ssh.LastErrorText
    destroy loo_Ssh
    return
end if

// Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html
ls_HttpReq = "GET /xyz123.html HTTP/1.1~r~nHost: www.chilkatsoft.com~r~n~r~n"

// Send the HTTP request:
li_Success = loo_Ssh.ChannelSendString(li_ChannelNum,ls_HttpReq,"ansi")
if li_Success <> 1 then
    Write-Debug loo_Ssh.LastErrorText
    destroy loo_Ssh
    return
end if

// Get the HTTP response.
// First read the HTTP response header which ends with a double CRLF.
// Calling ChannelReceiveUntilMatch will receive until match string is seen,
// or until a timeout occurs (IdleTimeoutMs property).  ChannelReceiveUntilMatch
// may read beyond the match string, but it will stop reading as soon as the match
// string is seen.
li_CaseSensitive = 0
ls_MatchStr = "~r~n~r~n"
li_Success = loo_Ssh.ChannelReceiveUntilMatch(li_ChannelNum,ls_MatchStr,"ansi",li_CaseSensitive)
if li_Success <> 1 then
    Write-Debug loo_Ssh.LastErrorText
    destroy loo_Ssh
    return
end if

// Extract the HTTP header from the receive buffer.
// (GetReceiveTextS extracts up to and including the match string from the receive buffer)

ls_ResponseHeader = loo_Ssh.GetReceivedTextS(li_ChannelNum,ls_MatchStr,"ansi")
Write-Debug "---- HTTP Response Header ----"
Write-Debug ls_ResponseHeader

// Now get the body of the HTTP response (this is the HTML content
// of http://www.chilkatsoft.com/xyz.html
// It's possible we've already received the entire HTTP response in the
// call to ChannelReceiveUntilMatch.  Therefore, we'll poll for any remaining data
// and wait a max of .2 seconds.

li_PollTimeoutMs = 200
li_NumBytesRead = loo_Ssh.ChannelPoll(li_ChannelNum,li_PollTimeoutMs)
// We're not checking for an error here.
// A return value of -2 means that no data was available and the poll simply timed out (not an error)
// A return value of -1 indicates an error.
// A return value greater than 0 indicates that additional data was received.

Write-Debug "---- HTML BODY ----"

// Extract the remainder of the accumulated data in the internal receive buffer.
// This should be our HTML body:

ls_HtmlBody = loo_Ssh.GetReceivedText(li_ChannelNum,"ansi")
Write-Debug ls_HtmlBody

// Close the channel:
li_Success = loo_Ssh.ChannelSendClose(li_ChannelNum)
if li_Success <> 1 then
    Write-Debug loo_Ssh.LastErrorText
    destroy loo_Ssh
    return
end if

// Disconnect
loo_Ssh.Disconnect()


destroy loo_Ssh