VB.NET

Connect to FTP Through a SOCKS Proxy

Demonstrates connecting through a SOCKS proxy using SocksVersion, SocksHostname, SocksPort, SocksUsername, and SocksPassword.

Background: SOCKS is a general-purpose TCP relay, so it carries FTP transparently. SocksVersion is the switch — 0 disables it, while 4 or 5 selects the protocol. SOCKS5 supports username/password authentication and is the usual choice; SOCKS4 supports only a user identifier. Because FTP opens separate data connections, a SOCKS proxy combined with passive mode is generally the most reliable arrangement.

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Dim success As Boolean = False

Dim ftp As New Chilkat.Ftp2

ftp.Hostname = "ftp.example.com"
ftp.Username = "myFtpLogin"

'  SocksVersion selects the proxy: 0 (default) = none, 4 = SOCKS4, 5 = SOCKS5.
ftp.SocksVersion = 5
ftp.SocksHostname = "socks.example.com"
ftp.SocksPort = 1080

'  SOCKS5 supports username/password authentication; SOCKS4 uses only a user identifier.
ftp.SocksUsername = "myProxyLogin"
ftp.SocksPassword = "myProxyPassword"

'  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.
ftp.Password = "myPassword"

success = ftp.Connect()
If (success = False) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Connected through the SOCKS proxy.")

success = ftp.Disconnect()
If (success = False) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If