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(PowerShell) SSH Tunnel (Port Forwarding via direct-tcpip channel)

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

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[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

#  Important: It is helpful to send the contents of the
#  ssh.LastErrorText property when requesting support.

$ssh = New-Object Chilkat.Ssh

#  Any string automatically begins a fully-functional 30-day trial.
$success = $ssh.UnlockComponent("Anything for 30-day trial")
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

#  Connect to an SSH server:

#  Hostname may be an IP address or hostname:
$hostname = "192.168.1.117"
$port = 22

$success = $ssh.Connect($hostname,$port)
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

#  Wait a max of 5 seconds when reading responses..
$ssh.IdleTimeoutMs = 5000

#  Authenticate using login/password:
$success = $ssh.AuthenticatePw("chilkat","myPassword")
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

#  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).

$channelNum = $ssh.OpenDirectTcpIpChannel("www.chilkatsoft.com",80)
if ($channelNum -lt 0) {
    $($ssh.LastErrorText)
    exit
}

#  Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html
$httpReq = "GET /xyz123.html HTTP/1.1`r`nHost: www.chilkatsoft.com`r`n`r`n"

#  Send the HTTP request:
$success = $ssh.ChannelSendString($channelNum,$httpReq,"ansi")
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

#  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.
$caseSensitive = $false
$matchStr = "`r`n`r`n"
$success = $ssh.ChannelReceiveUntilMatch($channelNum,$matchStr,"ansi",$caseSensitive)
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

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

$responseHeader = $ssh.GetReceivedTextS($channelNum,$matchStr,"ansi")
$("---- HTTP Response Header ----")
$($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.

$pollTimeoutMs = 200
$numBytesRead = $ssh.ChannelPoll($channelNum,$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.

$("---- HTML BODY ----")

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

$htmlBody = $ssh.GetReceivedText($channelNum,"ansi")
$($htmlBody)

#  Close the channel:
$success = $ssh.ChannelSendClose($channelNum)
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

#  Disconnect
$ssh.Disconnect()

 

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