PowerBuilder

SSH Tunnel Through an Outbound SOCKS Proxy

Demonstrates reaching the SSH server through an outbound SOCKS proxy using the SocksVersion, SocksHostname, SocksPort, SocksUsername, and SocksPassword properties.

Background: This is the reverse direction from dynamic forwarding: here a SOCKS proxy is used to reach the SSH server, for networks where outbound connections must pass through one. SocksVersion is the switch — 0 means no SOCKS, while 4 or 5 selects the protocol. SOCKS5 supports username/password authentication and remote DNS; SOCKS4 supports only a username.

Chilkat PowerBuilder Downloads

Download Chilkat for PowerBuilder

PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Tunnel
integer li_SshPort
string ls_Password
integer li_ListenPort
integer li_WaitForThreadExit

li_Success = 0

//  Demonstrates reaching the SSH server through an outbound SOCKS proxy using the SshTunnel
//  properties SocksVersion, SocksHostname, SocksPort, SocksUsername, and SocksPassword.

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

//  Set SocksVersion to 4 or 5 to route the outbound connection to the SSH server through a SOCKS
//  proxy.  A value of 0 (the default) means no SOCKS proxy.
loo_Tunnel.SocksVersion = 5
loo_Tunnel.SocksHostname = "socks.example.com"
loo_Tunnel.SocksPort = 1080

//  SOCKS4 supports only a username; SOCKS5 supports username and password.
loo_Tunnel.SocksUsername = "myProxyLogin"
loo_Tunnel.SocksPassword = "myProxyPassword"

loo_Tunnel.DestHostname = "db.internal.example.com"
loo_Tunnel.DestPort = 5432

//  Connect to the SSH server through the SOCKS proxy configured above.
li_SshPort = 22
li_Success = loo_Tunnel.Connect("ssh.example.com",li_SshPort)
if li_Success = 0 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    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_Tunnel.AuthenticatePw("mySshLogin",ls_Password)
if li_Success = 0 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    return
end if

li_ListenPort = 1080
li_Success = loo_Tunnel.BeginAccepting(li_ListenPort)
if li_Success = 0 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    return
end if

Write-Debug "Tunnel established through the SOCKS proxy."

li_WaitForThreadExit = 1
li_Success = loo_Tunnel.CloseTunnel(li_WaitForThreadExit)
if li_Success = 0 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    return
end if



destroy loo_Tunnel