PowerBuilder

Get the Type of an Active SSH Channel

Demonstrates the Chilkat Ssh.GetChannelType method, which returns the type of the channel at a zero-based enumeration index. The only argument is the index — an enumeration position, not a channel number. Values include session, x11, forwarded-tcpip, and direct-tcpip.

Background: Paired with GetChannelNumber, this turns the channel collection into a readable inventory of what a connection is currently doing — which channels are running commands (session) versus tunneling TCP traffic (direct-tcpip). That is valuable for diagnostics and for application code that manages several channel kinds at once. An out-of-range index causes the string-returning method to report failure.

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PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Ssh
integer li_SshPort
string ls_Password
integer li_ChannelNum
integer n
integer i
integer li_ChNum
string ls_ChType

li_Success = 0

//  Demonstrates the Ssh.GetChannelType method, which returns the type of the channel at a
//  zero-based enumeration index.  The only argument is the index, which is an enumeration
//  position and not a channel number.  Values include "session" and "direct-tcpip".

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

li_SshPort = 22
li_Success = loo_Ssh.Connect("ssh.example.com",li_SshPort)
if li_Success = 0 then
    Write-Debug loo_Ssh.LastErrorText
    destroy loo_Ssh
    return
end if

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
ls_Password = "mySshPassword"

li_Success = loo_Ssh.AuthenticatePw("mySshLogin",ls_Password)
if li_Success = 0 then
    Write-Debug loo_Ssh.LastErrorText
    destroy loo_Ssh
    return
end if

li_ChannelNum = loo_Ssh.OpenSessionChannel()
if li_ChannelNum < 0 then
    Write-Debug loo_Ssh.LastErrorText
    destroy loo_Ssh
    return
end if

//  Enumerate the active channels and report each one's number and type.
n = loo_Ssh.NumOpenChannels

for i = 0 to n - 1
    li_ChNum = loo_Ssh.GetChannelNumber(i)
    ls_ChType = loo_Ssh.GetChannelType(i)
    if loo_Ssh.LastMethodSuccess = 0 then
        Write-Debug loo_Ssh.LastErrorText
        destroy loo_Ssh
        return
    end if

    Write-Debug "Channel " + string(li_ChNum) + " is of type " + ls_ChType
next

loo_Ssh.Disconnect()


destroy loo_Ssh