Ruby

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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Ruby

require 'chilkat'

success = false

ftp = Chilkat::CkFtp2.new()

ftp.put_Hostname("ftp.example.com")
ftp.put_Username("myFtpLogin")

#  SocksVersion selects the proxy: 0 (default) = none, 4 = SOCKS4, 5 = SOCKS5.
ftp.put_SocksVersion(5)
ftp.put_SocksHostname("socks.example.com")
ftp.put_SocksPort(1080)

#  SOCKS5 supports username/password authentication; SOCKS4 uses only a user identifier.
ftp.put_SocksUsername("myProxyLogin")
ftp.put_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.put_Password("myPassword")

success = ftp.Connect()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end

print "Connected through the SOCKS proxy." + "\n";

success = ftp.Disconnect()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end