OpenVPN Plugins
 ---------------
 
 Starting with OpenVPN 2.0-beta17, compiled plugin modules are
 supported on any *nix OS which includes libdl or on Windows.
 One or more modules may be loaded into OpenVPN using
 the --plugin directive, and each plugin module is capable of
 intercepting any of the script callbacks which OpenVPN supports:
 
 (1) up
 (2) down
 (3) route-up
 (4) ipchange
 (5) tls-verify
 (6) auth-user-pass-verify
 (7) client-connect
 (8) client-disconnect
 (9) learn-address
 
 See the openvpn-plugin.h file in the top-level directory of the
 OpenVPN source distribution for more detailed information
 on the plugin interface.
 
 Included Plugins
 ----------------
 
 auth-pam -- Authenticate using PAM and a split privilege
             execution model which functions even if
             root privileges or the execution environment
             have been altered with --user/--group/--chroot.
             Tested on Linux only.
 
 down-root -- Enable the running of down scripts with root privileges
              even if --user/--group/--chroot have been used
              to drop root privileges or change the execution
              environment.  Not applicable on Windows.
 
 examples -- A simple example that demonstrates a portable
             plugin, i.e. one which can be built for *nix
             or Windows from the same source.
 
 Building Plugins
 ----------------
 
 cd to the top-level directory of a plugin, and use the
 "make" command to build it.  The examples plugin is
 built using a build script, not a makefile.