mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 04:02:15 +02:00
ef8da98bd4
Rename BufferAllocated --> BufferAllocatedRc Buffer: split RC from BufferAllocated Also make changes as needed where BufferAllocated is used Buffer: Split allocation flags into own struct Leaving flags in template causes each alias to have identical flags by different names, which requires each type to pointlessly use the nested name. Make RC: Clean up headers buffer.hpp, make_rc.hpp Signed-off-by: Charlie Vigue <charlie.vigue@openvpn.com>
250 lines
7.3 KiB
C++
250 lines
7.3 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) 2012-2022 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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// Low-level UDP transport object.
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#ifndef OPENVPN_TRANSPORT_UDPLINK_H
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#define OPENVPN_TRANSPORT_UDPLINK_H
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#include <memory>
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#include <openvpn/io/io.hpp>
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/rc.hpp>
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#include <openvpn/frame/frame.hpp>
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#include <openvpn/log/sessionstats.hpp>
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#ifdef OPENVPN_GREMLIN
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#include <openvpn/transport/gremlin.hpp>
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#endif
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#if defined(OPENVPN_DEBUG_UDPLINK) && OPENVPN_DEBUG_UDPLINK >= 1
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#define OPENVPN_LOG_UDPLINK_ERROR(x) OPENVPN_LOG(x)
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#else
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#define OPENVPN_LOG_UDPLINK_ERROR(x)
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#endif
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#if defined(OPENVPN_DEBUG_UDPLINK) && OPENVPN_DEBUG_UDPLINK >= 3
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#define OPENVPN_LOG_UDPLINK_VERBOSE(x) OPENVPN_LOG(x)
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#else
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#define OPENVPN_LOG_UDPLINK_VERBOSE(x)
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#endif
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namespace openvpn::UDPTransport {
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typedef openvpn_io::ip::udp::endpoint AsioEndpoint;
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enum
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{
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SEND_SOCKET_HALTED = -1,
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SEND_PARTIAL = -2,
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};
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struct PacketFrom
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{
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typedef std::unique_ptr<PacketFrom> SPtr;
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BufferAllocated buf;
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AsioEndpoint sender_endpoint;
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};
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template <typename ReadHandler>
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class UDPLink : public RC<thread_unsafe_refcount>
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{
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public:
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typedef RCPtr<UDPLink> Ptr;
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UDPLink(ReadHandler read_handler_arg,
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openvpn_io::ip::udp::socket &socket_arg,
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const Frame::Context &frame_context_arg,
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const SessionStats::Ptr &stats_arg)
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: socket(socket_arg),
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halt(false),
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read_handler(read_handler_arg),
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frame_context(frame_context_arg),
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stats(stats_arg)
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{
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}
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#ifdef OPENVPN_GREMLIN
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void gremlin_config(const Gremlin::Config::Ptr &config)
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{
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if (config)
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gremlin.reset(new Gremlin::SendRecvQueue(socket.get_executor().context(), config, false));
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}
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#endif
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// Returns 0 on success, or a system error code on error.
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// May also return SEND_PARTIAL or SEND_SOCKET_HALTED.
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int send(const Buffer &buf, const AsioEndpoint *endpoint)
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{
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#ifdef OPENVPN_GREMLIN
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if (gremlin)
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{
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gremlin_send(buf, endpoint);
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return 0;
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}
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else
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#endif
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return do_send(buf, endpoint);
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}
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void start(const int n_parallel)
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{
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if (!halt)
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{
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for (int i = 0; i < n_parallel; i++)
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queue_read(nullptr);
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}
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}
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void stop()
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{
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halt = true;
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#ifdef OPENVPN_GREMLIN
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if (gremlin)
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gremlin->stop();
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#endif
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}
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void reset_align_adjust(const size_t align_adjust)
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{
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frame_context.reset_align_adjust(align_adjust);
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}
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~UDPLink()
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{
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stop();
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}
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private:
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void queue_read(PacketFrom *udpfrom)
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{
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OPENVPN_LOG_UDPLINK_VERBOSE("UDPLink::queue_read");
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if (!udpfrom)
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udpfrom = new PacketFrom();
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frame_context.prepare(udpfrom->buf);
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socket.async_receive_from(frame_context.mutable_buffer(udpfrom->buf),
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udpfrom->sender_endpoint,
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[self = Ptr(this), udpfrom = PacketFrom::SPtr(udpfrom)](const openvpn_io::error_code &error, const size_t bytes_recvd) mutable
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{
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OPENVPN_ASYNC_HANDLER;
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self->handle_read(std::move(udpfrom), error, bytes_recvd);
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});
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}
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void handle_read(PacketFrom::SPtr pfp, const openvpn_io::error_code &error, const size_t bytes_recvd)
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{
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OPENVPN_LOG_UDPLINK_VERBOSE("UDPLink::handle_read: " << error.message());
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if (!halt)
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{
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if (bytes_recvd)
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{
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if (!error)
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{
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OPENVPN_LOG_UDPLINK_VERBOSE("UDP[" << bytes_recvd << "] from " << pfp->sender_endpoint);
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pfp->buf.set_size(bytes_recvd);
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stats->inc_stat(SessionStats::BYTES_IN, bytes_recvd);
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stats->inc_stat(SessionStats::PACKETS_IN, 1);
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#ifdef OPENVPN_GREMLIN
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if (gremlin)
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gremlin_recv(pfp);
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else
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#endif
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read_handler->udp_read_handler(pfp);
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}
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else
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{
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OPENVPN_LOG_UDPLINK_ERROR("UDP recv error: " << error.message());
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stats->error(Error::NETWORK_RECV_ERROR);
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}
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}
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if (!halt)
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queue_read(pfp.release()); // reuse PacketFrom object if still available
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}
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}
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int do_send(const Buffer &buf, const AsioEndpoint *endpoint)
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{
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if (!halt)
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{
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try
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{
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const size_t wrote = endpoint
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? socket.send_to(buf.const_buffer(), *endpoint)
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: socket.send(buf.const_buffer());
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stats->inc_stat(SessionStats::BYTES_OUT, wrote);
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stats->inc_stat(SessionStats::PACKETS_OUT, 1);
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if (wrote == buf.size())
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return 0;
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else
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{
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OPENVPN_LOG_UDPLINK_ERROR("UDP partial send error");
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stats->error(Error::NETWORK_SEND_ERROR);
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return SEND_PARTIAL;
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}
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}
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catch (openvpn_io::system_error &e)
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{
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OPENVPN_LOG_UDPLINK_ERROR("UDP send exception: " << e.what());
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stats->error(Error::NETWORK_SEND_ERROR);
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return e.code().value();
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}
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}
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else
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return SEND_SOCKET_HALTED;
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}
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#ifdef OPENVPN_GREMLIN
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void gremlin_send(const Buffer &buf, const AsioEndpoint *endpoint)
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{
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std::unique_ptr<AsioEndpoint> ep;
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if (endpoint)
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ep.reset(new AsioEndpoint(*endpoint));
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gremlin->send_queue([self = Ptr(this), buf = BufferAllocatedRc(buf, 0), ep = std::move(ep)]() mutable
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{
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if (!self->halt)
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self->do_send(buf, ep.get()); });
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}
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void gremlin_recv(PacketFrom::SPtr &pfp)
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{
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gremlin->recv_queue([self = Ptr(this), pfp = std::move(pfp)]() mutable
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{
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if (!self->halt)
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self->read_handler->udp_read_handler(pfp); });
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}
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#endif
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openvpn_io::ip::udp::socket &socket;
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bool halt;
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ReadHandler read_handler;
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Frame::Context frame_context;
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SessionStats::Ptr stats;
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#ifdef OPENVPN_GREMLIN
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std::unique_ptr<Gremlin::SendRecvQueue> gremlin;
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#endif
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};
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} // namespace openvpn::UDPTransport
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#endif
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