mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 12:12:15 +02:00
c540642c87
Since we're now using it to also re-lookup stale RemoteList items the new name makes more sense. Also changed the NotifyCallback method to bulk_resolve_done(). Signed-off-by: Heiko Hund <heiko@openvpn.net>
710 lines
20 KiB
C++
710 lines
20 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2020 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// This file implements the top-level connection logic for an OpenVPN client
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// connection. It is concerned with starting, stopping, pausing, and resuming
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// OpenVPN client connections. It deals with retrying a connection and handles
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// the connection timeout. It also deals with connection exceptions and understands
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// the difference between an exception that should halt any further reconnection
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// attempts (such as AUTH_FAILED), and other exceptions such as network errors
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// that would justify a retry.
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//
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// Some of the methods in the class (such as stop, pause, and reconnect) are often
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// called by another thread that is controlling the connection, therefore
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// thread-safe methods are provided where the thread-safe function posts a message
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// to the actual connection thread.
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//
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// In an OpenVPN client connection, the following object stack would be used:
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//
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// 1. class ClientConnect --
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// The top level object in an OpenVPN client connection.
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// 2. class ClientProto::Session --
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// The OpenVPN client protocol object.
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// 3. class ProtoContext --
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// The core OpenVPN protocol implementation that is common to both
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// client and server.
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// 4. ProtoStackBase<Packet> --
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// The lowest-level class that implements the basic functionality of
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// tunneling a protocol over a reliable or unreliable transport
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// layer, but isn't specific to OpenVPN per-se.
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#ifndef OPENVPN_CLIENT_CLICONNECT_H
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#define OPENVPN_CLIENT_CLICONNECT_H
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#include <memory>
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#include <utility>
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#include <openvpn/common/bigmutex.hpp>
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#include <openvpn/common/rc.hpp>
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#include <openvpn/asio/asiowork.hpp>
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#include <openvpn/error/excode.hpp>
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#include <openvpn/time/asiotimer.hpp>
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#include <openvpn/client/cliopt.hpp>
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#include <openvpn/client/remotelist.hpp>
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#include <openvpn/client/clilife.hpp>
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namespace openvpn {
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// ClientConnect implements an "always-try-to-reconnect" approach, with remote
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// list rotation. Only gives up on auth failure or other fatal errors that
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// cannot be remedied by retrying.
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class ClientConnect : ClientProto::NotifyCallback,
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RemoteList::BulkResolve::NotifyCallback,
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ClientLifeCycle::NotifyCallback,
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public RC<thread_unsafe_refcount>
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{
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public:
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typedef RCPtr<ClientConnect> Ptr;
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typedef ClientOptions::Client Client;
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OPENVPN_SIMPLE_EXCEPTION(client_connect_unhandled_exception);
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ClientConnect(openvpn_io::io_context& io_context_arg,
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const ClientOptions::Ptr& client_options_arg)
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: generation(0),
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halt(false),
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paused(false),
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client_finalized(false),
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dont_restart_(false),
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lifecycle_started(false),
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conn_timeout(client_options_arg->conn_timeout()),
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io_context(io_context_arg),
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client_options(client_options_arg),
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server_poll_timer(io_context_arg),
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restart_wait_timer(io_context_arg),
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conn_timer(io_context_arg),
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conn_timer_pending(false)
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{
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}
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void start()
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{
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if (!client && !halt)
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{
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if (!test_network())
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throw ErrorCode(Error::NETWORK_UNAVAILABLE, true, "Network Unavailable");
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RemoteList::Ptr remote_list = client_options->remote_list_precache();
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RemoteList::BulkResolve::Ptr bulkres(new RemoteList::BulkResolve(io_context,
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remote_list,
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client_options->stats_ptr()));
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if (bulkres->work_available())
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::Resolve();
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client_options->events().add_event(std::move(ev));
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bulk_resolve = bulkres;
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bulk_resolve->start(this); // asynchronous -- will call back to bulk_resolve_done
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}
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else
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new_client();
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}
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}
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void send_explicit_exit_notify()
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{
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if (!halt && client)
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client->send_explicit_exit_notify();
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}
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void graceful_stop()
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{
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send_explicit_exit_notify();
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//sleep(5); // simulate slow stop (comment out for production)
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stop();
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}
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void stop()
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{
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if (!halt)
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{
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halt = true;
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if (bulk_resolve)
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bulk_resolve->cancel();
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if (client)
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{
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client->tun_set_disconnect();
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client->stop(false);
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}
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cancel_timers();
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asio_work.reset();
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client_options->finalize(true);
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if (lifecycle_started)
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{
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ClientLifeCycle* lc = client_options->lifecycle();
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if (lc)
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lc->stop();
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}
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ClientEvent::Base::Ptr ev = new ClientEvent::Disconnected();
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client_options->events().add_event(std::move(ev));
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#ifdef OPENVPN_IO_REQUIRES_STOP
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io_context.stop();
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#endif
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}
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}
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void stop_on_signal(const openvpn_io::error_code& error, int signal_number)
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{
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stop();
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}
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// like stop() but may be safely called by another thread
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void thread_safe_stop()
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{
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if (!halt)
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openvpn_io::post(io_context, [self=Ptr(this)]()
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{
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OPENVPN_ASYNC_HANDLER;
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self->graceful_stop();
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});
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}
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void pause(const std::string& reason)
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{
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if (!halt && !paused)
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{
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paused = true;
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if (client)
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{
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client->send_explicit_exit_notify();
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client->stop(false);
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interim_finalize();
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}
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cancel_timers();
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asio_work.reset(new AsioWork(io_context));
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ClientEvent::Base::Ptr ev = new ClientEvent::Pause(reason);
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::N_PAUSE);
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}
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}
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void resume()
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{
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if (!halt && paused)
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{
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paused = false;
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ClientEvent::Base::Ptr ev = new ClientEvent::Resume();
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client_options->events().add_event(std::move(ev));
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client_options->remote_reset_cache_item();
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new_client();
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}
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}
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void reconnect(int seconds)
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{
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if (!halt)
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{
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if (seconds < 0)
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seconds = 0;
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OPENVPN_LOG("Client terminated, reconnecting in " << seconds << "...");
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server_poll_timer.cancel();
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client_options->remote_reset_cache_item();
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restart_wait_timer.expires_after(Time::Duration::seconds(seconds));
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restart_wait_timer.async_wait([self=Ptr(this), gen=generation](const openvpn_io::error_code& error)
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{
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OPENVPN_ASYNC_HANDLER;
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self->restart_wait_callback(gen, error);
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});
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}
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}
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void thread_safe_pause(const std::string& reason)
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{
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if (!halt)
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openvpn_io::post(io_context, [self=Ptr(this), reason]()
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{
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OPENVPN_ASYNC_HANDLER;
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self->pause(reason);
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});
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}
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void thread_safe_resume()
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{
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if (!halt)
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openvpn_io::post(io_context, [self=Ptr(this)]()
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{
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OPENVPN_ASYNC_HANDLER;
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self->resume();
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});
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}
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void thread_safe_reconnect(int seconds)
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{
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if (!halt)
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openvpn_io::post(io_context, [self=Ptr(this), seconds]()
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{
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OPENVPN_ASYNC_HANDLER;
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self->reconnect(seconds);
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});
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}
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void dont_restart()
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{
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dont_restart_ = true;
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}
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void post_cc_msg(const std::string& msg)
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{
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if (!halt && client)
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client->post_cc_msg(msg);
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}
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void thread_safe_post_cc_msg(std::string msg)
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{
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if (!halt)
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openvpn_io::post(io_context, [self=Ptr(this), msg=std::move(msg)]()
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{
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OPENVPN_ASYNC_HANDLER;
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self->post_cc_msg(msg);
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});
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}
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~ClientConnect()
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{
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stop();
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}
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private:
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void interim_finalize()
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{
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if (!client_finalized)
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{
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client_options->finalize(false);
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client_finalized = true;
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}
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}
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virtual void bulk_resolve_done() override
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{
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if (!halt && generation == 0)
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new_client();
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}
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void cancel_timers()
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{
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restart_wait_timer.cancel();
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server_poll_timer.cancel();
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conn_timer.cancel();
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conn_timer_pending = false;
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}
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void restart_wait_callback(unsigned int gen, const openvpn_io::error_code& e)
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{
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if (!e && gen == generation && !halt)
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{
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if (paused)
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resume();
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else
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{
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if (client)
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client->send_explicit_exit_notify();
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new_client();
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}
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}
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}
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void server_poll_callback(unsigned int gen, const openvpn_io::error_code& e)
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{
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if (!e && gen == generation && !halt && !client->first_packet_received())
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{
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OPENVPN_LOG("Server poll timeout, trying next remote entry...");
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new_client();
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}
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}
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void conn_timer_callback(unsigned int gen, const openvpn_io::error_code& e)
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{
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if (!e && !halt)
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{
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client_options->stats().error(Error::CONNECTION_TIMEOUT);
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if (!paused && client_options->pause_on_connection_timeout())
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{
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// go into pause state instead of disconnect
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pause("");
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}
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else
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::ConnectionTimeout();
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client_options->events().add_event(std::move(ev));
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stop();
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}
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}
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}
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void conn_timer_start(int timeout)
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{
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if (!conn_timer_pending && timeout > 0)
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{
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conn_timer.expires_after(Time::Duration::seconds(timeout));
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conn_timer.async_wait([self=Ptr(this), gen=generation](const openvpn_io::error_code& error)
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{
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OPENVPN_ASYNC_HANDLER;
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self->conn_timer_callback(gen, error);
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});
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conn_timer_pending = true;
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}
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}
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bool test_network() const
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{
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ClientLifeCycle* lc = client_options->lifecycle();
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if (lc)
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{
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if (!lc->network_available())
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return false;
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}
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return true;
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}
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virtual void client_proto_connected() override
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{
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conn_timer.cancel();
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conn_timer_pending = false;
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// Monitor connection lifecycle notifications, such as sleep,
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// wakeup, network-unavailable, and network-available.
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// Not all platforms define a lifecycle object. Some platforms
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// such as Android and iOS manage lifecycle notifications
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// in the UI, and they call pause(), resume(), reconnect(), etc.
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// as needed using the main ovpncli API.
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if (!lifecycle_started)
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{
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ClientLifeCycle* lc = client_options->lifecycle(); // lifecycle is defined by platform, and may be NULL
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if (lc)
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{
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lc->start(this);
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lifecycle_started = true;
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}
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}
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}
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void client_proto_renegotiated() override
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{
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// Try to re-lookup potentially outdated RemoteList::Items
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if (bulk_resolve)
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bulk_resolve->start(this);
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}
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void queue_restart(const unsigned int delay_ms = 2000)
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{
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OPENVPN_LOG("Client terminated, restarting in " << delay_ms << " ms...");
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server_poll_timer.cancel();
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interim_finalize();
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client_options->remote_reset_cache_item();
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restart_wait_timer.expires_after(Time::Duration::milliseconds(delay_ms));
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restart_wait_timer.async_wait([self=Ptr(this), gen=generation](const openvpn_io::error_code& error)
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{
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OPENVPN_ASYNC_HANDLER;
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self->restart_wait_callback(gen, error);
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});
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}
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virtual void client_proto_auth_pending_timeout(int timeout) override
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{
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if (conn_timer_pending)
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{
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auto timer_left = std::chrono::duration_cast<std::chrono::seconds>(conn_timer.expiry() - AsioTimer::clock_type::now()).count();
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if(timer_left < timeout)
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{
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OPENVPN_LOG("Extending connection timeout from " << timer_left << " to " << timeout << " for pending authentification");
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conn_timer.cancel();
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conn_timer_pending = false;
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conn_timer_start(timeout);
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}
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}
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}
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virtual void client_proto_terminate() override
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{
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if (!halt)
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{
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if (dont_restart_)
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{
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stop();
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}
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else
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{
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switch (client->fatal())
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{
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case Error::UNDEF: // means that there wasn't a fatal error
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queue_restart();
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break;
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// Errors below will cause the client to NOT retry the connection,
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// or otherwise give the error special handling.
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case Error::AUTH_FAILED:
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{
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const std::string& reason = client->fatal_reason();
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if (ChallengeResponse::is_dynamic(reason)) // dynamic challenge/response?
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::DynamicChallenge(reason);
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client_options->events().add_event(std::move(ev));
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stop();
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}
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else
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::AuthFailed(reason);
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::AUTH_FAILED);
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if (client_options->retry_on_auth_failed())
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queue_restart(5000);
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else
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stop();
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}
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}
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break;
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case Error::TUN_SETUP_FAILED:
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::TunSetupFailed(client->fatal_reason());
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::TUN_SETUP_FAILED);
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stop();
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}
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break;
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case Error::TUN_REGISTER_RINGS_ERROR:
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::TunSetupFailed(client->fatal_reason());
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::TUN_REGISTER_RINGS_ERROR);
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stop();
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}
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break;
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case Error::TUN_IFACE_CREATE:
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::TunIfaceCreate(client->fatal_reason());
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::TUN_IFACE_CREATE);
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stop();
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}
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break;
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case Error::TUN_IFACE_DISABLED:
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::TunIfaceDisabled(client->fatal_reason());
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::TUN_IFACE_DISABLED);
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queue_restart(5000);
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}
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break;
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case Error::PROXY_ERROR:
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::ProxyError(client->fatal_reason());
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::PROXY_ERROR);
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stop();
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}
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break;
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case Error::PROXY_NEED_CREDS:
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::ProxyNeedCreds(client->fatal_reason());
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::PROXY_NEED_CREDS);
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stop();
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}
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break;
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case Error::CERT_VERIFY_FAIL:
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::CertVerifyFail(client->fatal_reason());
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::CERT_VERIFY_FAIL);
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stop();
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}
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break;
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case Error::TLS_VERSION_MIN:
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{
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ClientEvent::Base::Ptr ev = new ClientEvent::TLSVersionMinFail();
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client_options->events().add_event(std::move(ev));
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client_options->stats().error(Error::TLS_VERSION_MIN);
|
|
stop();
|
|
}
|
|
break;
|
|
case Error::CLIENT_HALT:
|
|
{
|
|
ClientEvent::Base::Ptr ev = new ClientEvent::ClientHalt(client->fatal_reason());
|
|
client_options->events().add_event(std::move(ev));
|
|
client_options->stats().error(Error::CLIENT_HALT);
|
|
stop();
|
|
}
|
|
break;
|
|
case Error::CLIENT_RESTART:
|
|
{
|
|
ClientEvent::Base::Ptr ev = new ClientEvent::ClientRestart(client->fatal_reason());
|
|
client_options->events().add_event(std::move(ev));
|
|
client_options->stats().error(Error::CLIENT_RESTART);
|
|
queue_restart();
|
|
}
|
|
break;
|
|
case Error::INACTIVE_TIMEOUT:
|
|
{
|
|
ClientEvent::Base::Ptr ev = new ClientEvent::InactiveTimeout();
|
|
client_options->events().add_event(std::move(ev));
|
|
client_options->stats().error(Error::INACTIVE_TIMEOUT);
|
|
|
|
// explicit exit notify is sent earlier by
|
|
// ClientProto::Session::inactive_callback()
|
|
stop();
|
|
}
|
|
break;
|
|
case Error::TRANSPORT_ERROR:
|
|
{
|
|
ClientEvent::Base::Ptr ev = new ClientEvent::TransportError(client->fatal_reason());
|
|
client_options->events().add_event(std::move(ev));
|
|
client_options->stats().error(Error::TRANSPORT_ERROR);
|
|
queue_restart(5000); // use a larger timeout to allow preemption from higher levels
|
|
}
|
|
break;
|
|
case Error::TUN_ERROR:
|
|
{
|
|
ClientEvent::Base::Ptr ev = new ClientEvent::TunError(client->fatal_reason());
|
|
client_options->events().add_event(std::move(ev));
|
|
client_options->stats().error(Error::TUN_ERROR);
|
|
queue_restart(5000);
|
|
}
|
|
break;
|
|
case Error::TUN_HALT:
|
|
{
|
|
ClientEvent::Base::Ptr ev = new ClientEvent::TunHalt(client->fatal_reason());
|
|
client_options->events().add_event(std::move(ev));
|
|
client_options->stats().error(Error::TUN_HALT);
|
|
stop();
|
|
}
|
|
break;
|
|
case Error::RELAY:
|
|
{
|
|
ClientEvent::Base::Ptr ev = new ClientEvent::Relay();
|
|
client_options->events().add_event(std::move(ev));
|
|
client_options->stats().error(Error::RELAY);
|
|
transport_factory_relay = client->transport_factory_relay();
|
|
queue_restart(0);
|
|
}
|
|
break;
|
|
case Error::RELAY_ERROR:
|
|
{
|
|
ClientEvent::Base::Ptr ev = new ClientEvent::RelayError(client->fatal_reason());
|
|
client_options->events().add_event(std::move(ev));
|
|
client_options->stats().error(Error::RELAY_ERROR);
|
|
stop();
|
|
}
|
|
break;
|
|
default:
|
|
throw client_connect_unhandled_exception();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void new_client()
|
|
{
|
|
// Make sure generation is > 0 in case of overflow
|
|
if (++generation == 0)
|
|
++generation;
|
|
|
|
if (client_options->asio_work_always_on())
|
|
asio_work.reset(new AsioWork(io_context));
|
|
else
|
|
asio_work.reset();
|
|
if (client)
|
|
{
|
|
client->stop(false);
|
|
interim_finalize();
|
|
}
|
|
if (generation > 1 && !transport_factory_relay)
|
|
{
|
|
ClientEvent::Base::Ptr ev = new ClientEvent::Reconnecting();
|
|
client_options->events().add_event(std::move(ev));
|
|
client_options->stats().error(Error::N_RECONNECT);
|
|
if (!(client && client->reached_connected_state()))
|
|
client_options->next();
|
|
}
|
|
|
|
// client_config in cliopt.hpp
|
|
Client::Config::Ptr cli_config = client_options->client_config(!transport_factory_relay);
|
|
client.reset(new Client(io_context, *cli_config, this)); // build ClientProto::Session from cliproto.hpp
|
|
client_finalized = false;
|
|
|
|
// relay?
|
|
if (transport_factory_relay)
|
|
{
|
|
client->transport_factory_override(std::move(transport_factory_relay));
|
|
transport_factory_relay.reset();
|
|
}
|
|
|
|
restart_wait_timer.cancel();
|
|
if (client_options->server_poll_timeout_enabled())
|
|
{
|
|
server_poll_timer.expires_after(client_options->server_poll_timeout());
|
|
server_poll_timer.async_wait([self=Ptr(this), gen=generation](const openvpn_io::error_code& error)
|
|
{
|
|
OPENVPN_ASYNC_HANDLER;
|
|
self->server_poll_callback(gen, error);
|
|
});
|
|
}
|
|
conn_timer_start(conn_timeout);
|
|
client->start();
|
|
}
|
|
|
|
// ClientLifeCycle::NotifyCallback callbacks
|
|
|
|
virtual void cln_stop() override
|
|
{
|
|
thread_safe_stop();
|
|
}
|
|
|
|
virtual void cln_pause(const std::string& reason) override
|
|
{
|
|
thread_safe_pause(reason);
|
|
}
|
|
|
|
virtual void cln_resume() override
|
|
{
|
|
thread_safe_resume();
|
|
}
|
|
|
|
virtual void cln_reconnect(int seconds) override
|
|
{
|
|
thread_safe_reconnect(seconds);
|
|
}
|
|
|
|
unsigned int generation;
|
|
bool halt;
|
|
bool paused;
|
|
bool client_finalized;
|
|
bool dont_restart_;
|
|
bool lifecycle_started;
|
|
int conn_timeout;
|
|
openvpn_io::io_context& io_context;
|
|
ClientOptions::Ptr client_options;
|
|
Client::Ptr client;
|
|
TransportClientFactory::Ptr transport_factory_relay;
|
|
AsioTimer server_poll_timer;
|
|
AsioTimer restart_wait_timer;
|
|
AsioTimer conn_timer;
|
|
bool conn_timer_pending;
|
|
std::unique_ptr<AsioWork> asio_work;
|
|
RemoteList::BulkResolve::Ptr bulk_resolve;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|