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Location: cpp/openttd-patchpack/source/src/network/network_stun.cpp
r26913:e7b3d514fe34
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Revert 92c7551: Line drawing algorithm fix broke other cases (#10497)
This reverts commit 92c755161d6a467d33477bd0041fc720d7d9ba41.
This reverts commit 92c755161d6a467d33477bd0041fc720d7d9ba41.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | /*
* This file is part of OpenTTD.
* OpenTTD 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, version 2.
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file network_stun.cpp STUN sending/receiving part of the network protocol. */
#include "../stdafx.h"
#include "../debug.h"
#include "network.h"
#include "network_coordinator.h"
#include "network_stun.h"
#include "../safeguards.h"
/** Connect to the STUN server. */
class NetworkStunConnecter : public TCPConnecter {
private:
ClientNetworkStunSocketHandler *stun_handler;
std::string token;
uint8 family;
public:
/**
* Initiate the connecting.
* @param stun_handler The handler for this request.
* @param connection_string The address of the server.
*/
NetworkStunConnecter(ClientNetworkStunSocketHandler *stun_handler, const std::string &connection_string, const std::string &token, uint8 family) :
TCPConnecter(connection_string, NETWORK_STUN_SERVER_PORT, NetworkAddress(), family),
stun_handler(stun_handler),
token(token),
family(family)
{
}
void OnFailure() override
{
this->stun_handler->connecter = nullptr;
/* Connection to STUN server failed. For example, the client doesn't
* support IPv6, which means it will fail that attempt. */
_network_coordinator_client.StunResult(this->token, this->family, false);
}
void OnConnect(SOCKET s) override
{
this->stun_handler->connecter = nullptr;
assert(this->stun_handler->sock == INVALID_SOCKET);
this->stun_handler->sock = s;
/* Store the local address; later connects will reuse it again.
* This is what makes STUN work for most NATs. */
this->stun_handler->local_addr = NetworkAddress::GetSockAddress(s);
/* We leave the connection open till the real connection is setup later. */
}
};
/**
* Connect to the STUN server over either IPv4 or IPv6.
* @param token The token as received from the Game Coordinator.
* @param family What IP family to use.
*/
void ClientNetworkStunSocketHandler::Connect(const std::string &token, uint8 family)
{
this->token = token;
this->family = family;
this->connecter = new NetworkStunConnecter(this, NetworkStunConnectionString(), token, family);
}
/**
* Send a STUN packet to the STUN server.
* @param token The token as received from the Game Coordinator.
* @param family What IP family this STUN request is for.
* @return The handler for this STUN request.
*/
std::unique_ptr<ClientNetworkStunSocketHandler> ClientNetworkStunSocketHandler::Stun(const std::string &token, uint8 family)
{
auto stun_handler = std::make_unique<ClientNetworkStunSocketHandler>();
stun_handler->Connect(token, family);
Packet *p = new Packet(PACKET_STUN_SERCLI_STUN);
p->Send_uint8(NETWORK_COORDINATOR_VERSION);
p->Send_string(token);
p->Send_uint8(family);
stun_handler->SendPacket(p);
return stun_handler;
}
NetworkRecvStatus ClientNetworkStunSocketHandler::CloseConnection(bool error)
{
NetworkStunSocketHandler::CloseConnection(error);
/* Also make sure any pending connecter is killed ASAP. */
if (this->connecter != nullptr) {
this->connecter->Kill();
this->connecter = nullptr;
}
return NETWORK_RECV_STATUS_OKAY;
}
ClientNetworkStunSocketHandler::~ClientNetworkStunSocketHandler()
{
if (this->connecter != nullptr) {
this->connecter->Kill();
this->connecter = nullptr;
}
}
/**
* Check whether we received/can send some data from/to the STUN server and
* when that's the case handle it appropriately.
*/
void ClientNetworkStunSocketHandler::SendReceive()
{
if (this->sock == INVALID_SOCKET) return;
/* We never attempt to receive anything on a STUN socket. After
* connecting a STUN connection, the local address will be reused to
* to establish the connection with the real server. If we would be to
* read this socket, some OSes get confused and deliver us packets meant
* for the real connection. It appears most OSes play best when we simply
* never attempt to read it to start with (and the packets will remain
* available on the other socket).
* Protocol-wise, the STUN server will never send any packet back anyway. */
this->CanSendReceive();
if (this->SendPackets() == SPS_ALL_SENT && !this->sent_result) {
/* We delay giving the GC the result this long, as to make sure we
* have sent the STUN packet first. This means the GC is more likely
* to have the result ready by the time our StunResult() packet
* arrives. */
this->sent_result = true;
_network_coordinator_client.StunResult(this->token, this->family, true);
}
}
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