TODO

   1 Immediately:
   2 * Remove connection/socket leaks.
   3 * Support server-side (client-to-proxy) SSL connections.
   4 * Configuring SSL support, like certificates and keys.
   5 * Configuring access control policy.
   6
   7 Some easy protocol support:
   8 * Support APOP.
   9 * Support STLS.
  10
  11 Some extensibility support:
  12 * Support gateway proxies based on username maps.
  13
  14 Some sysadmin cake:
  15 * Configuration interface besides CLI.