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+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * Plug-in types. These types correspond to the set of script callbacks
+ * supported by OpenVPN.
+ */
+#define OPENVPN_PLUGIN_UP 0
+#define OPENVPN_PLUGIN_DOWN 1
+#define OPENVPN_PLUGIN_ROUTE_UP 2
+#define OPENVPN_PLUGIN_IPCHANGE 3
+#define OPENVPN_PLUGIN_TLS_VERIFY 4
+#define OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY 5
+#define OPENVPN_PLUGIN_CLIENT_CONNECT 6
+#define OPENVPN_PLUGIN_CLIENT_DISCONNECT 7
+#define OPENVPN_PLUGIN_LEARN_ADDRESS 8
+#define OPENVPN_PLUGIN_N 9
+
+/*
+ * Build a mask out of a set of plug-in types.
+ */
+#define OPENVPN_PLUGIN_MASK(x) (1<<(x))
+
+/*
+ * A pointer to a plugin-defined object which contains
+ * the object state.
+ */
+typedef void *openvpn_plugin_handle_t;
+
+/*
+ * Return value for openvpn_plugin_func_v1 function
+ */
+#define OPENVPN_PLUGIN_FUNC_SUCCESS 0
+#define OPENVPN_PLUGIN_FUNC_ERROR 1
+
+/*
+ * For Windows (needs to be modified for MSVC)
+ */
+#if defined(__MINGW32_VERSION) && !defined(OPENVPN_PLUGIN_H)
+# define OPENVPN_EXPORT __declspec(dllexport)
+#else
+# define OPENVPN_EXPORT
+#endif
+
+/*
+ * If OPENVPN_PLUGIN_H is defined, we know that we are being
+ * included in an OpenVPN compile, rather than a plugin compile.
+ */
+#ifdef OPENVPN_PLUGIN_H
+
+/*
+ * We are compiling OpenVPN.
+ */
+#define OPENVPN_PLUGIN_DEF typedef
+#define OPENVPN_PLUGIN_FUNC(name) (*name)
+
+#else
+
+/*
+ * We are compiling plugin.
+ */
+#define OPENVPN_PLUGIN_DEF OPENVPN_EXPORT
+#define OPENVPN_PLUGIN_FUNC(name) name
+
+#endif
+
+/*
+ * Multiple plugin modules can be cascaded, and modules can be
+ * used in tandem with scripts. The order of operation is that
+ * the module func() functions are called in the order that
+ * the modules were specified in the config file. If a script
+ * was specified as well, it will be called last. If the
+ * return code of the module/script controls an authentication
+ * function (such as tls-verify or auth-user-pass-verify), then
+ * every module and script must return success (0) in order for
+ * the connection to be authenticated.
+ *
+ * Notes:
+ *
+ * Plugins which use a privilege-separation model (by forking in
+ * their initialization function before the main OpenVPN process
+ * downgrades root privileges and/or executes a chroot) must
+ * daemonize after a fork if the "daemon" environmental variable is
+ * set. In addition, if the "daemon_log_redirect" variable is set,
+ * the plugin should preserve stdout/stderr across the daemon()
+ * syscall. See the daemonize() function in plugin/auth-pam/auth-pam.c
+ * for an example.
+ */
+
+/*
+ * Prototypes for functions which OpenVPN plug-ins must define.
+ */
+
+/*
+ * FUNCTION: openvpn_plugin_open_v1
+ *
+ * REQUIRED: YES
+ *
+ * Called on initial plug-in load. OpenVPN will preserve plug-in state
+ * across SIGUSR1 restarts but not across SIGHUP restarts. A SIGHUP reset
+ * will cause the plugin to be closed and reopened.
+ *
+ * ARGUMENTS
+ *
+ * *type_mask : Set by OpenVPN to the logical OR of all script
+ * types which this version of OpenVPN supports. The plug-in
+ * should set this value to the logical OR of all script types
+ * which the plug-in wants to intercept. For example, if the
+ * script wants to intercept the client-connect and
+ * client-disconnect script types:
+ *
+ * *type_mask = OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_CLIENT_CONNECT)
+ * | OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_CLIENT_DISCONNECT)
+ *
+ * argv : a NULL-terminated array of options provided to the OpenVPN
+ * "plug-in" directive. argv[0] is the dynamic library pathname.
+ *
+ * envp : a NULL-terminated array of OpenVPN-set environmental
+ * variables in "name=value" format. Note that for security reasons,
+ * these variables are not actually written to the "official"
+ * environmental variable store of the process.
+ *
+ * RETURN VALUE
+ *
+ * An openvpn_plugin_handle_t value on success, NULL on failure
+ */
+OPENVPN_PLUGIN_DEF openvpn_plugin_handle_t OPENVPN_PLUGIN_FUNC(openvpn_plugin_open_v1)
+ (unsigned int *type_mask, const char *argv[], const char *envp[]);
+
+/*
+ * FUNCTION: openvpn_plugin_func_v1
+ *
+ * Called to perform the work of a given script type.
+ *
+ * REQUIRED: YES
+ *
+ * ARGUMENTS
+ *
+ * handle : the openvpn_plugin_handle_t value which was returned by
+ * openvpn_plugin_open_v1.
+ *
+ * type : one of the PLUGIN_x types
+ *
+ * argv : a NULL-terminated array of "command line" options which
+ * would normally be passed to the script. argv[0] is the dynamic
+ * library pathname.
+ *
+ * envp : a NULL-terminated array of OpenVPN-set environmental
+ * variables in "name=value" format. Note that for security reasons,
+ * these variables are not actually written to the "official"
+ * environmental variable store of the process.
+ *
+ * RETURN VALUE
+ *
+ * OPENVPN_PLUGIN_FUNC_SUCCESS on success, OPENVPN_PLUGIN_FUNC_ERROR on failure
+ */
+OPENVPN_PLUGIN_DEF int OPENVPN_PLUGIN_FUNC(openvpn_plugin_func_v1)
+ (openvpn_plugin_handle_t handle, const int type, const char *argv[], const char *envp[]);
+
+/*
+ * FUNCTION: openvpn_plugin_close_v1
+ *
+ * REQUIRED: YES
+ *
+ * ARGUMENTS
+ *
+ * handle : the openvpn_plugin_handle_t value which was returned by
+ * openvpn_plugin_open_v1.
+ *
+ * Called immediately prior to plug-in unload.
+ */
+OPENVPN_PLUGIN_DEF void OPENVPN_PLUGIN_FUNC(openvpn_plugin_close_v1)
+ (openvpn_plugin_handle_t handle);
+
+/*
+ * FUNCTION: openvpn_plugin_abort_v1
+ *
+ * REQUIRED: NO
+ *
+ * ARGUMENTS
+ *
+ * handle : the openvpn_plugin_handle_t value which was returned by
+ * openvpn_plugin_open_v1.
+ *
+ * Called when OpenVPN is in the process of aborting due to a fatal error.
+ * Will only be called on an open context returned by a prior successful
+ * openvpn_plugin_open_v1 callback.
+ */
+OPENVPN_PLUGIN_DEF void OPENVPN_PLUGIN_FUNC(openvpn_plugin_abort_v1)
+ (openvpn_plugin_handle_t handle);