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/*
This file is part of Warzone 2100.
Copyright (C) 2024 Warzone 2100 Project
Warzone 2100 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Warzone 2100 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "tcp_connection_provider.h"
#include "lib/netplay/tcp/netsocket.h"
#include "lib/netplay/tcp/tcp_connection_address.h"
#include "lib/netplay/tcp/tcp_connection_poll_group.h"
#include "lib/netplay/tcp/tcp_client_connection.h"
#include "lib/netplay/tcp/tcp_listen_socket.h"
#include "lib/netplay/tcp/tcp_address_resolver.h"
#include "lib/netplay/connection_provider_registry.h"
#include "lib/netplay/open_connection_result.h"
#include "lib/netplay/pending_writes_manager_map.h"
#include "lib/netplay/port_mapping_manager.h"
#include "lib/netplay/wz_compression_provider.h"
#include "lib/framework/wzapp.h"
#ifdef WZ_OS_WIN
# include "lib/netplay/tcp/select_descriptor_set.h"
#else
# include "lib/netplay/tcp/poll_descriptor_set.h"
#endif
namespace tcp
{
void TCPConnectionProvider::initialize()
{
if (initialized_) { return; }
initialized_ = true;
SOCKETinit();
addressResolver_ = std::make_unique<TCPAddressResolver>();
}
void TCPConnectionProvider::shutdown()
{
if (!initialized_) { return; }
initialized_ = false;
addressResolver_.reset();
SOCKETshutdown();
}
ConnectionProviderType TCPConnectionProvider::type() const noexcept
{
return ConnectionProviderType::TCP_DIRECT;
}
net::result<std::unique_ptr<IConnectionAddress>> TCPConnectionProvider::resolveHost(const char* host, uint16_t port) const
{
ASSERT_OR_RETURN(tl::make_unexpected(make_network_error_code(EINVAL)), addressResolver_ != nullptr, "Address resolver not initialized");
return addressResolver_->resolveHost(host, port);
}
net::result<IListenSocket*> TCPConnectionProvider::openListenSocket(uint16_t port)
{
auto res = tcp::socketListen(port);
if (!res.has_value())
{
return tl::make_unexpected(res.error());
}
return new TCPListenSocket(*this, WzCompressionProvider::Instance(), PendingWritesManagerMap::instance().get(type()), res.value());
}
net::result<IClientConnection*> TCPConnectionProvider::openClientConnectionAny(const IConnectionAddress& addr, unsigned timeout)
{
const auto* tcpAddr = dynamic_cast<const TCPConnectionAddress*>(&addr);
ASSERT_OR_RETURN(tl::make_unexpected(make_network_error_code(EINVAL)), tcpAddr != nullptr, "Expected TCPConnectionAddress instance");
const auto* rawAddr = tcpAddr->asRawSocketAddress();
auto res = socketOpenAny(rawAddr, timeout);
if (!res.has_value())
{
return tl::make_unexpected(res.error());
}
return new TCPClientConnection(*this, WzCompressionProvider::Instance(), PendingWritesManagerMap::instance().get(type()), res.value());
}
IConnectionPollGroup* TCPConnectionProvider::newConnectionPollGroup()
{
return new TCPConnectionPollGroup(*this);
}
std::unique_ptr<IDescriptorSet> TCPConnectionProvider::newDescriptorSet(PollEventType eventType)
{
// For now, use `select()` on Windows instead of `poll()` because of a bug in
// Windows versions prior to "Windows 10 2004", which can lead to `poll()`
// function timing out on socket connection errors instead of returning an error early.
//
// For more information on the bug, see: https://stackoverflow.com/questions/21653003/is-this-wsapoll-bug-for-non-blocking-sockets-fixed
// and also https://learn.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsapoll#remarks
switch (eventType)
{
case PollEventType::READABLE:
{
#ifdef WZ_OS_WIN
IDescriptorSet* rawPtr = new tcp::SelectDescriptorSet<PollEventType::READABLE>();
return std::unique_ptr<IDescriptorSet>(rawPtr);
#else
IDescriptorSet* rawPtr = new tcp::PollDescriptorSet<PollEventType::READABLE>();
return std::unique_ptr<IDescriptorSet>(rawPtr);
#endif
}
case PollEventType::WRITABLE:
{
#ifdef WZ_OS_WIN
IDescriptorSet* rawPtr = new tcp::SelectDescriptorSet<PollEventType::WRITABLE>();
return std::unique_ptr<IDescriptorSet>(rawPtr);
#else
IDescriptorSet* rawPtr = new tcp::PollDescriptorSet<PollEventType::WRITABLE>();
return std::unique_ptr<IDescriptorSet>(rawPtr);
#endif
}
default:
ASSERT(false, "Unexpected PollEventType value: %d", static_cast<int>(eventType));
return nullptr;
}
}
PortMappingInternetProtocolMask TCPConnectionProvider::portMappingProtocolTypes() const
{
return static_cast<PortMappingInternetProtocolMask>(PortMappingInternetProtocol::TCP_IPV4) | static_cast<PortMappingInternetProtocolMask>(PortMappingInternetProtocol::TCP_IPV6);
}
} // namespace tcp
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