mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 12:12:15 +02:00
e7799e32ee
Signed-off-by: Arne Schwabe <arne@openvpn.net>
761 lines
20 KiB
C++
761 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) 2012-2018 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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#ifndef OPENVPN_TRANSPORT_DCO_DCOCLI_H
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#define OPENVPN_TRANSPORT_DCO_DCOCLI_H
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#include <vector>
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#include <memory>
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#include <sstream>
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/to_string.hpp>
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#include <openvpn/buffer/asiobuf.hpp>
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#include <openvpn/time/time.hpp>
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#include <openvpn/transport/client/transbase.hpp>
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#include <openvpn/tun/client/tunbase.hpp>
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#include <openvpn/tun/builder/capture.hpp>
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#include <openvpn/tun/linux/client/tunmethods.hpp>
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#include <openvpn/transport/dco.hpp>
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#include <openvpn/kovpn/kovpn.hpp>
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#include <openvpn/kovpn/kodev.hpp>
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#include <openvpn/kovpn/korekey.hpp>
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#include <openvpn/kovpn/kostats.hpp>
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#include <openvpn/linux/procfs.hpp>
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#ifdef ENABLE_PG
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#include <openvpn/kovpn/kodevtun.hpp>
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#endif
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// client-side DCO (Data Channel Offload) module for Linux/kovpn
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namespace openvpn {
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namespace DCOTransport {
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OPENVPN_EXCEPTION(dco_error);
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class ClientConfig : public DCO,
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public TransportClientFactory,
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public TunClientFactory
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{
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public:
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typedef RCPtr<ClientConfig> Ptr;
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std::string dev_name;
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DCO::TransportConfig transport;
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DCO::TunConfig tun;
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int trunk_unit = -1;
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unsigned int ping_restart_override = 0;
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virtual TunClientFactory::Ptr new_tun_factory(const DCO::TunConfig& conf, const OptionList& opt) override
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{
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tun = conf;
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// set a default MTU
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if (!tun.tun_prop.mtu)
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tun.tun_prop.mtu = 1500;
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// parse "dev" option
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{
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const Option* dev = opt.get_ptr("dev");
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if (dev)
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dev_name = dev->get(1, 64);
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else
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dev_name = "ovpnc";
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}
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// parse trunk-unit
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trunk_unit = opt.get_num<decltype(trunk_unit)>("trunk-unit", 1, trunk_unit, 0, 511);
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// parse ping-restart-override
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ping_restart_override = opt.get_num<decltype(ping_restart_override)>("ping-restart-override", 1, ping_restart_override, 0, 3600);
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return TunClientFactory::Ptr(this);
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}
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virtual TransportClientFactory::Ptr new_transport_factory(const DCO::TransportConfig& conf) override
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{
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transport = conf;
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return TransportClientFactory::Ptr(this);
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}
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virtual TunClient::Ptr new_tun_client_obj(openvpn_io::io_context& io_context,
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TunClientParent& parent,
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TransportClient* transcli) override;
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virtual TransportClient::Ptr new_transport_client_obj(openvpn_io::io_context& io_context,
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TransportClientParent* parent) override;
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static DCO::Ptr new_controller()
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{
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return new ClientConfig();
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}
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private:
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ClientConfig() {}
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};
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class Client : public TransportClient,
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public TunClient,
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public KoRekey::Receiver,
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public SessionStats::DCOTransportSource,
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public AsyncResolvableUDP
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{
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friend class ClientConfig;
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typedef RCPtr<Client> Ptr;
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struct ProtoBase
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{
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ProtoBase() {}
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virtual IP::Addr server_endpoint_addr() const = 0;
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virtual void close() = 0;
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virtual ~ProtoBase() {}
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ProtoBase(const ProtoBase&) = delete;
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ProtoBase& operator=(const ProtoBase&) = delete;
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};
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struct UDP : public ProtoBase
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{
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UDP(openvpn_io::io_context& io_context)
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: resolver(io_context),
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socket(io_context)
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{
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}
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virtual IP::Addr server_endpoint_addr() const override
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{
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return IP::Addr::from_asio(server_endpoint.address());
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}
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virtual void close() override
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{
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socket.close();
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resolver.cancel();
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}
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openvpn_io::ip::udp::resolver resolver;
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openvpn_io::ip::udp::socket socket;
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UDPTransport::AsioEndpoint server_endpoint;
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};
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#ifdef ENABLE_PG
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typedef KoTun::Tun<Client*> TunImpl;
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#else
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typedef KoTun::TunClient<Client*> TunImpl;
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#endif
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// calls tun_read_handler and tun_error_handler
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friend TunImpl::Base;
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public:
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// transport methods
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virtual void transport_start() override
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{
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if (halt)
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OPENVPN_THROW(dco_error, "transport_start called on halted instance");
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KoTun::DevConf devconf;
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if (config->transport.protocol.is_udp())
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devconf.dc.tcp = false;
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else if (config->transport.protocol.is_tcp())
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devconf.dc.tcp = true;
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else
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OPENVPN_THROW(dco_error, "protocol " << config->transport.protocol.str() << " not implemented");
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// config settings
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devconf.set_dev_name(config->dev_name);
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devconf.dc.max_peers = 1;
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devconf.dc.max_dev_queues = 1;
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devconf.dc.dev_tx_queue_len = 4096;
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devconf.dc.max_tun_queue_len = 4096;
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devconf.dc.max_tcp_send_queue_len = 64;
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devconf.dc.peer_lookup = OVPN_PEER_LOOKUP_NONE;
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devconf.dc.cpu_id = -1;
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/* We have a tun builder, we get the device from the
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* tun builder
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*/
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if (config->builder)
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{
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int fd = config->builder->tun_builder_open_kovpn(devconf);
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impl.reset (new TunImpl(io_context, fd, devconf.dc.dev_name,
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this, config->transport.frame));
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}
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else
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{
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// create kovpn tun socket (implementation in kodevtun.hpp)
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impl.reset (new TunImpl (io_context,
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devconf,
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this,
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config->transport.frame,
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nullptr,
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nullptr));
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}
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// set kovpn stats hook
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config->transport.stats->dco_configure(this);
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// if trunking, set RPS/XPS on iface
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if (config->trunk_unit >= 0)
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KoTun::KovpnBase::set_rps_xps(config->dev_name, devconf.dc.queue_index, config->tun.stop);
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if (devconf.dc.tcp)
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transport_start_tcp();
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else
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transport_start_udp();
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}
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virtual bool transport_send_const(const Buffer& buf) override
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{
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return send(buf);
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}
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virtual bool transport_send(BufferAllocated& buf) override
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{
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return send(buf);
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}
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virtual bool transport_send_queue_empty() override
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{
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return false;
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}
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virtual bool transport_has_send_queue() override
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{
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return false;
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}
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virtual unsigned int transport_send_queue_size() override
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{
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return 0;
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}
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virtual void reset_align_adjust(const size_t align_adjust) override
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{
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}
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virtual void transport_stop_requeueing() override
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{
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}
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virtual void server_endpoint_info(std::string& host, std::string& port, std::string& proto, std::string& ip_addr) const override
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{
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host = server_host;
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port = server_port;
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const IP::Addr addr = server_endpoint_addr();
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proto = "UDP";
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proto += addr.version_string();
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proto += "-DCO";
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ip_addr = addr.to_string();
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}
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virtual IP::Addr server_endpoint_addr() const override
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{
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if (proto)
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return proto->server_endpoint_addr();
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else
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return IP::Addr();
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}
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virtual Protocol transport_protocol() const override
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{
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switch (server_endpoint_addr().version())
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{
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case IP::Addr::V4:
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return Protocol(Protocol::UDPv4);
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case IP::Addr::V6:
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return Protocol(Protocol::UDPv6);
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default:
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return Protocol();
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}
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}
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virtual ~Client() override
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{
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stop_();
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}
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// tun methods
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virtual void tun_start(const OptionList& opt,
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TransportClient& transcli,
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CryptoDCSettings& dc_settings) override
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{
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if (halt || !tun_parent)
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OPENVPN_THROW(dco_error, "tun_start called on halted/undefined instance");
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try {
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const IP::Addr server_addr = server_endpoint_addr();
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// get the iface name
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state->iface_name = config->dev_name;
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// notify parent
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tun_parent->tun_pre_tun_config();
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// parse pushed options
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TunBuilderCapture::Ptr po;
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TunBuilderBase *builder;
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if (config->builder)
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{
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/* Also configure the tun builder to set the interface
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* config */
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builder = config->builder;
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}
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else
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{
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po.reset(new TunBuilderCapture());
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builder = po.get();
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}
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TunProp::configure_builder(builder,
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state.get(),
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config->transport.stats.get(),
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server_addr,
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config->tun.tun_prop,
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opt,
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nullptr,
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false);
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if (po)
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OPENVPN_LOG("CAPTURED OPTIONS:" << std::endl << po->to_string());
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#ifdef ENABLE_PG
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if (config->trunk_unit >= 0)
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{
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// trunk setup
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ovpn_peer_assign_route_id kri;
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std::memset(&kri, 0, sizeof(kri));
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kri.peer_id = peer_id;
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kri.route_id = config->trunk_unit;
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kri.allow_incoming = true;
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kri.snat_flags = OVPN_SNAT_DEFAULT_ON | OVPN_SNAT_REQUIRED;
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// SNAT via VPN IPv4 addresses received from server
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{
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const TunBuilderCapture::RouteAddress *ra = po->vpn_ip(IP::Addr::V4);
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if (ra)
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kri.snat.a4 = IP::Addr(ra->address, "server-assigned-vpn4-addr", IP::Addr::V4).to_ipv4().to_in_addr();
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}
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// SNAT via VPN IPv6 addresses received from server
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{
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const TunBuilderCapture::RouteAddress *ra = po->vpn_ip(IP::Addr::V6);
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if (ra)
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kri.snat.a6 = IP::Addr(ra->address, "server-assigned-vpn6-addr", IP::Addr::V4).to_ipv6().to_in6_addr();
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}
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// kovpn route ID setup
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KoTun::API::peer_assign_route_id(impl->native_handle(), &kri);
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}
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else
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#endif // ENABLE_PG
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if (config->builder)
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{
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config->builder->tun_builder_establish_dco(impl->native_handle(), peer_id);
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}
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else // po is defined when builder is nullptr
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{
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// add/remove command lists
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ActionList::Ptr add_cmds = new ActionList();
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remove_cmds.reset(new ActionListReversed());
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// configure tun properties
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std::vector<IP::Route> rtvec;
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// non-trunk setup
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TUN_LINUX::tun_config(state->iface_name, *po, &rtvec, *add_cmds,
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*remove_cmds, false);
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// Add routes to DCO implementation
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impl->peer_add_routes(peer_id, rtvec);
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// execute commands to bring up interface
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add_cmds->execute_log();
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}
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// Add a hook so ProtoContext will call back to
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// rekey() on rekey ops.
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dc_settings.set_factory(CryptoDCFactory::Ptr(new KoRekey::Factory(dc_settings.factory(), this, config->transport.frame)));
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// signal that we are connected
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tun_parent->tun_connected();
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}
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catch (const std::exception& e)
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{
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stop_();
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tun_parent->tun_error(Error::TUN_SETUP_FAILED, e.what());
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}
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}
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virtual void set_disconnect() override
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{
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}
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virtual bool tun_send(BufferAllocated& buf) override // return true if send succeeded
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{
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return false;
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}
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virtual std::string tun_name() const override
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{
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if (impl)
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return impl->name();
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else
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return "UNDEF_DCO";
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}
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virtual std::string vpn_ip4() const override
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{
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if (state->vpn_ip4_addr.specified())
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return state->vpn_ip4_addr.to_string();
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else
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return "";
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}
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virtual std::string vpn_ip6() const override
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{
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if (state->vpn_ip6_addr.specified())
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return state->vpn_ip6_addr.to_string();
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else
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return "";
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}
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virtual std::string vpn_gw4() const override
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{
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if (state->vpn_ip4_gw.specified())
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return state->vpn_ip4_gw.to_string();
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else
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return "";
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}
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virtual std::string vpn_gw6() const override
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{
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if (state->vpn_ip6_gw.specified())
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return state->vpn_ip6_gw.to_string();
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else
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return "";
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}
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// KoRekey::Receiver methods
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virtual void rekey(const CryptoDCInstance::RekeyType rktype,
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const KoRekey::Info& rkinfo) override
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{
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if (halt)
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return;
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KoRekey::Key key(rktype, rkinfo, peer_id, false);
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impl->peer_keys_reset(key());
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if (transport_parent->is_keepalive_enabled())
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{
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struct ovpn_peer_keepalive ka;
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// Disable userspace keepalive, get the userspace
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// keepalive parameters, and enable kovpn keepalive.
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ka.peer_id = peer_id;
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transport_parent->disable_keepalive(ka.keepalive_ping,
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ka.keepalive_timeout);
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// Allow overide of keepalive timeout
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if (config->ping_restart_override)
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ka.keepalive_timeout = config->ping_restart_override;
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// Modify the peer
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impl->peer_set_keepalive(&ka);
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}
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}
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virtual void explicit_exit_notify() override
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{
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impl->peer_xmit_explicit_exit_notify(peer_id);
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}
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// shared methods
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virtual void stop() override
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{
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stop_();
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}
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private:
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Client(openvpn_io::io_context& io_context_arg,
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ClientConfig* config_arg,
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TransportClientParent* parent_arg)
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: AsyncResolvableUDP(io_context_arg),
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io_context(io_context_arg),
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halt(false),
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state(new TunProp::State()),
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config(config_arg),
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transport_parent(parent_arg),
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tun_parent(nullptr),
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peer_id(-1)
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{
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}
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virtual void transport_reparent(TransportClientParent* parent_arg)
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{
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transport_parent = parent_arg;
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}
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void transport_start_udp()
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{
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proto.reset(new UDP(io_context));
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if (config->transport.remote_list->endpoint_available(&server_host, &server_port, nullptr))
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{
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start_connect_udp();
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}
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else
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{
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transport_parent->transport_pre_resolve();
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async_resolve_name(server_host, server_port);
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}
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}
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// called after DNS resolution has succeeded or failed
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void resolve_callback(const openvpn_io::error_code& error,
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openvpn_io::ip::udp::resolver::results_type results)
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{
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if (!halt)
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{
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if (!error)
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{
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// save resolved endpoint list in remote_list
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config->transport.remote_list->set_endpoint_range(results);
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start_connect_udp();
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}
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else
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{
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std::ostringstream os;
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os << "DNS resolve error on '" << server_host << "' for UDP session: " << error.message();
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config->transport.stats->error(Error::RESOLVE_ERROR);
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stop_();
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transport_parent->transport_error(Error::UNDEF, os.str());
|
|
}
|
|
}
|
|
}
|
|
|
|
// do UDP connect
|
|
void start_connect_udp()
|
|
{
|
|
config->transport.remote_list->get_endpoint(udp().server_endpoint);
|
|
OPENVPN_LOG("Contacting " << udp().server_endpoint << " via UDP");
|
|
transport_parent->transport_wait();
|
|
udp().socket.open(udp().server_endpoint.protocol());
|
|
udp().socket.async_connect(udp().server_endpoint, [self=Ptr(this)](const openvpn_io::error_code& error)
|
|
{
|
|
self->start_impl_udp(error);
|
|
});
|
|
}
|
|
|
|
// start I/O on UDP socket
|
|
void start_impl_udp(const openvpn_io::error_code& error)
|
|
{
|
|
if (!halt)
|
|
{
|
|
if (!error)
|
|
{
|
|
// attach UDP socket to kovpn
|
|
peer_id = impl->peer_new_udp_client(udp().socket.native_handle(), 0, 0);
|
|
|
|
// queue reads on tun
|
|
impl->start(8); // parallel reads
|
|
transport_parent->transport_connecting();
|
|
}
|
|
else
|
|
{
|
|
std::ostringstream os;
|
|
os << "UDP connect error on '" << server_host << ':' << server_port << "' (" << udp().server_endpoint << "): " << error.message();
|
|
config->transport.stats->error(Error::UDP_CONNECT_ERROR);
|
|
stop_();
|
|
transport_parent->transport_error(Error::UNDEF, os.str());
|
|
}
|
|
}
|
|
}
|
|
|
|
void transport_start_tcp()
|
|
{
|
|
OPENVPN_THROW(dco_error, "TCP not implemented yet"); // fixme for DCO
|
|
}
|
|
|
|
void tun_read_handler(KoTun::PacketFrom::SPtr& pfp) // called by TunImpl
|
|
{
|
|
if (halt)
|
|
return;
|
|
|
|
try {
|
|
const struct ovpn_tun_head *th = (const struct ovpn_tun_head *)pfp->buf.read_alloc(sizeof(struct ovpn_tun_head));
|
|
switch (th->type)
|
|
{
|
|
case OVPN_TH_TRANS_BY_PEER_ID:
|
|
{
|
|
if (peer_id < 0 || th->peer_id != peer_id)
|
|
{
|
|
OPENVPN_LOG("dcocli: OVPN_TH_TRANS_BY_PEER_ID unrecognized peer_id=" << th->peer_id);
|
|
return;
|
|
}
|
|
|
|
transport_parent->transport_recv(pfp->buf);
|
|
cc_rx_bytes += pfp->buf.size();
|
|
break;
|
|
}
|
|
case OVPN_TH_NOTIFY_STATUS:
|
|
{
|
|
const struct ovpn_tun_head_status *thn = (const struct ovpn_tun_head_status *)th;
|
|
|
|
if (peer_id < 0 || thn->head.peer_id != peer_id)
|
|
{
|
|
OPENVPN_LOG("dcocli: OVPN_TH_NOTIFY_STATUS unrecognized peer_id=" << thn->head.peer_id);
|
|
return;
|
|
}
|
|
|
|
const bool stop = (thn->head.status != OVPN_STATUS_ACTIVE);
|
|
OPENVPN_LOG("dcocli: status=" << int(thn->head.status) << " peer_id=" << peer_id << " rx_bytes=" << thn->rx_bytes << " tx_bytes=" << thn->tx_bytes); // fixme
|
|
if (stop)
|
|
throw Exception("stop status=" + to_string(thn->head.status));
|
|
break;
|
|
}
|
|
default:
|
|
OPENVPN_LOG("dcocli: unknown ovpn_tun_head type=" << (int)th->type);
|
|
break;
|
|
}
|
|
}
|
|
catch (const std::exception& e)
|
|
{
|
|
const std::string msg = std::string("dcocli: tun_read_handler: ") + e.what();
|
|
OPENVPN_LOG(msg);
|
|
stop_();
|
|
transport_parent->transport_error(Error::TRANSPORT_ERROR, msg);
|
|
}
|
|
}
|
|
|
|
void tun_error_handler(const Error::Type errtype, // called by TunImpl
|
|
const openvpn_io::error_code* error)
|
|
{
|
|
OPENVPN_LOG("TUN error");
|
|
stop_();
|
|
}
|
|
|
|
bool send(const Buffer& buf)
|
|
{
|
|
struct ovpn_tun_head head;
|
|
std::memset(&head, 0, sizeof(head));
|
|
head.type = OVPN_TH_TRANS_BY_PEER_ID;
|
|
head.peer_id = peer_id;
|
|
return impl->write_seq(AsioConstBufferSeq2(Buffer(reinterpret_cast<Buffer::type>(&head), sizeof(head), true),
|
|
buf));
|
|
}
|
|
|
|
void stop_()
|
|
{
|
|
if (!halt)
|
|
{
|
|
halt = true;
|
|
config->transport.stats->dco_update(); // final update
|
|
config->transport.stats->dco_configure(nullptr);
|
|
if (config->builder)
|
|
config->builder->tun_builder_teardown(true);
|
|
else if (remove_cmds)
|
|
remove_cmds->execute_log();
|
|
if (impl)
|
|
impl->stop();
|
|
if (proto)
|
|
proto->close();
|
|
}
|
|
}
|
|
|
|
UDP& udp()
|
|
{
|
|
return *static_cast<UDP*>(proto.get());
|
|
}
|
|
|
|
// override for SessionStats::DCOTransportSource
|
|
virtual SessionStats::DCOTransportSource::Data dco_transport_stats_delta() override
|
|
{
|
|
if (impl)
|
|
{
|
|
struct ovpn_peer_status ops;
|
|
ops.peer_id = peer_id;
|
|
if (impl->peer_get_status(&ops))
|
|
{
|
|
const SessionStats::DCOTransportSource::Data data(ops.rx_bytes + cc_rx_bytes, ops.tx_bytes);
|
|
const SessionStats::DCOTransportSource::Data delta = data - last_stats;
|
|
last_stats = data;
|
|
return delta;
|
|
}
|
|
}
|
|
return SessionStats::DCOTransportSource::Data();
|
|
}
|
|
|
|
openvpn_io::io_context& io_context;
|
|
bool halt;
|
|
|
|
TunProp::State::Ptr state;
|
|
|
|
ClientConfig::Ptr config;
|
|
TransportClientParent* transport_parent;
|
|
TunClientParent* tun_parent;
|
|
|
|
std::unique_ptr<ProtoBase> proto;
|
|
|
|
ActionList::Ptr remove_cmds;
|
|
|
|
std::string server_host;
|
|
std::string server_port;
|
|
|
|
TunImpl::Ptr impl;
|
|
int peer_id;
|
|
|
|
SessionStats::DCOTransportSource::Data last_stats;
|
|
__u64 cc_rx_bytes = 0;
|
|
};
|
|
|
|
inline DCO::Ptr new_controller()
|
|
{
|
|
return ClientConfig::new_controller();
|
|
}
|
|
|
|
inline TransportClient::Ptr ClientConfig::new_transport_client_obj(openvpn_io::io_context& io_context,
|
|
TransportClientParent* parent)
|
|
{
|
|
return TransportClient::Ptr(new Client(io_context, this, parent));
|
|
}
|
|
|
|
inline TunClient::Ptr ClientConfig::new_tun_client_obj(openvpn_io::io_context& io_context,
|
|
TunClientParent& parent,
|
|
TransportClient* transcli)
|
|
{
|
|
Client* cli = static_cast<Client*>(transcli);
|
|
cli->tun_parent = &parent;
|
|
return TunClient::Ptr(cli);
|
|
}
|
|
}
|
|
};
|
|
|
|
#endif
|