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authorParménides GV <parmegv@sdf.org>2014-04-09 17:07:48 +0200
committerParménides GV <parmegv@sdf.org>2014-04-09 17:15:17 +0200
commit51ff5a18f1f074e27e97d822745551a7e8fa068d (patch)
tree402e7dd42778a218635bb29a4c2dff93ea7f6525 /openvpn/doc/doxygen/doc_tunnel_state.h
parent910b0e1746ab3f63e63808b198ad51fec5b635e5 (diff)
parentb5ba0abc1610dd4bf573ebcabc5e8f6ab0c9528f (diff)
Merge branch 'feature/implement-gradle-build-system-#4676' into develop
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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) 2010 Fox Crypto B.V. <openvpn@fox-it.com>
- *
- *
- * 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
- */
-
-/**
- * @file
- * VPN tunnel state documentation file.
- */
-
-/**
- * @page tunnel_state Structure of the VPN tunnel state storage
- *
- * This section describes how OpenVPN stores its VPN tunnel state during
- * operation.
- *
- * OpenVPN uses several data structures as storage containers for state
- * information of active VPN tunnels. These are described in this
- * section, together with a little bit of history to help understand the
- * origin of the current architecture.
- *
- * Whether an OpenVPN process is running in client-mode or server-mode
- * determines whether it can support only one or multiple simultaneously
- * active VPN tunnels. This consequently also determines how the
- * associated state information is wrapped up internally. This section
- * gives an overview of the differences.
- *
- * @section tunnel_state_history Historic developments
- *
- * In the old v1.x series, an OpenVPN process managed only one single VPN
- * tunnel. This allowed the VPN tunnel state to be stored together with
- * process-global information in one single \c context structure.
- *
- * This changed, however, in the v2.x series, as new OpenVPN versions
- * running in server-mode can support multiple simultaneously active VPN
- * tunnels. This necessitated a redesign of the VPN tunnel state
- * container structures, and modification of the \link
- * external_multiplexer External Multiplexer\endlink and \link
- * internal_multiplexer Internal Multiplexer\endlink systems. The
- * majority of these changes are only relevant for OpenVPN processes
- * running in server-mode, and the client-mode structure has remained very
- * similar to the v1.x single-tunnel form.
- *
- * @section tunnel_state_client Client-mode state
- *
- * An OpenVPN process running in client-mode can manage at most one single
- * VPN tunnel at any one time. The state information for a client's VPN
- * tunnel is stored in a \c context structure.
- *
- * The \c context structure is created in the \c main() function. That is
- * also where process-wide initialization takes place, such as parsing
- * command line %options and reading configuration files. The \c context
- * is then passed to \c tunnel_point_to_point() which drives OpenVPN's
- * main event processing loop. These functions are both part of the \link
- * eventloop Main Event Loop\endlink module.
- *
- * @subsection tunnel_state_client_init Initialization and cleanup
- *
- * Because there is only one \c context structure present, it can be
- * initialized and cleaned up from the client's main event processing
- * function. Before the \c tunnel_point_to_point() function enters its
- * event loop, it calls \c init_instance_handle_signals() which calls \c
- * init_instance() to initialize the single \c context structure. After
- * the event loop stops, it calls \c close_instance() to clean up the \c
- * context.
- *
- * @subsection tunnel_state_client_event Event processing
- *
- * When the main event processing loop activates the external or internal
- * multiplexer to handle a network event, it is not necessary to determine
- * which VPN tunnel the event is associated with, because there is only
- * one VPN tunnel active.
- *
- * @section tunnel_state_server Server-mode state
- *
- * An OpenVPN process running in server-mode can manage multiple
- * simultaneously active VPN tunnels. For every VPN tunnel active, in
- * other words for every OpenVPN client which is connected to a server,
- * the OpenVPN server has one \c context structure in which it stores that
- * particular VPN tunnel's state information.
- *
- * @subsection tunnel_state_server_multi Multi_context and multi_instance structures
- *
- * To support multiple \c context structures, each is wrapped in a \c
- * multi_instance structure, and all the \c multi_instance structures are
- * registered in one single \c multi_context structure. The \link
- * external_multiplexer External Multiplexer\endlink and \link
- * internal_multiplexer Internal Multiplexer\endlink then use the \c
- * multi_context to retrieve the correct \c multi_instance and \c context
- * associated with a given network address.
- *
- * @subsection tunnel_state_server_init Startup and initialization
- *
- * An OpenVPN process running in server-mode starts in the same \c main()
- * function as it would in client-mode. The same process-wide
- * initialization is performed, and the resulting state and configuration
- * is stored in a \c context structure. The server-mode and client-mode
- * processes diverge when the \c main() function calls one of \c
- * tunnel_point_to_point() or \c tunnel_server().
- *
- * In server-mode, \c main() calls the \c tunnel_server() function, which
- * transfers control to \c tunnel_server_udp_single_threaded() or \c
- * tunnel_server_tcp() depending on the external transport protocol.
- *
- * These functions receive the \c context created in \c main(). This
- * object has a special status in server-mode, as it does not represent an
- * active VPN tunnel, but does contain process-wide configuration
- * parameters. In the source code, it is often stored in "top" variables.
- * To distinguish this object from other instances of the same type, its
- * \c context.mode value is set to \c CM_TOP. Other \c context objects,
- * which do represent active VPN tunnels, have a \c context.mode set to \c
- * CM_CHILD_UDP or \c CM_CHILD_TCP, depending on the external transport
- * protocol.
- *
- * Both \c tunnel_server_udp_single_threaded() and \c tunnel_server_tcp()
- * perform similar initialization. In either case, a \c multi_context
- * structure is created, and it is initialized according to the
- * configuration stored in the top \c context by the \c multi_init() and
- * \c multi_top_init() functions.
- *
- * @subsection tunnel_state_server_tunnels Creating and destroying VPN tunnels
- *
- * When an OpenVPN client makes a new connection to a server, the server
- * creates a new \c context and \c multi_instance. The latter is
- * registered in the \c multi_context, which makes it possible for the
- * external and internal multiplexers to retrieve the correct \c
- * multi_instance and \c context when a network event occurs.
- *
- * @subsection tunnel_state_server_cleanup Final cleanup
- *
- * After the main event loop exits, both \c
- * tunnel_server_udp_single_threaded() and \c tunnel_server_tcp() perform
- * similar cleanup. They call \c multi_uninit() followed by \c
- * multi_top_free() to clean up the \c multi_context structure.
- */