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Location: cpp/openttd-patchpack/source/src/network/core/tcp_connect.cpp - annotation
r26549:82dacf005b0a
14.4 KiB
text/x-c
Change: Use Rect helpers for widget drawing.
This replaces repetitive and sometimes unwieldy use of constants.
This replaces repetitive and sometimes unwieldy use of constants.
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* 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 tcp_connect.cpp Basic functions to create connections without blocking.
*/
#include "../../stdafx.h"
#include "../../thread.h"
#include "tcp.h"
#include "../network_coordinator.h"
#include "../network_internal.h"
#include <deque>
#include "../../safeguards.h"
/** List of connections that are currently being created */
static std::vector<TCPConnecter *> _tcp_connecters;
/**
* Create a new connecter for the given address.
* @param connection_string The address to connect to.
* @param default_port If not indicated in connection_string, what port to use.
* @param bind_address The local bind address to use. Defaults to letting the OS find one.
*/
TCPConnecter::TCPConnecter(const std::string &connection_string, uint16 default_port, NetworkAddress bind_address, int family) :
bind_address(bind_address),
family(family)
{
this->connection_string = NormalizeConnectionString(connection_string, default_port);
_tcp_connecters.push_back(this);
}
/**
* Create a new connecter for the server.
* @param connection_string The address to connect to.
* @param default_port If not indicated in connection_string, what port to use.
*/
TCPServerConnecter::TCPServerConnecter(const std::string &connection_string, uint16 default_port) :
server_address(ServerAddress::Parse(connection_string, default_port))
{
switch (this->server_address.type) {
case SERVER_ADDRESS_DIRECT:
this->connection_string = this->server_address.connection_string;
break;
case SERVER_ADDRESS_INVITE_CODE:
this->status = Status::Connecting;
_network_coordinator_client.ConnectToServer(this->server_address.connection_string, this);
break;
default:
NOT_REACHED();
}
_tcp_connecters.push_back(this);
}
TCPConnecter::~TCPConnecter()
{
if (this->resolve_thread.joinable()) {
this->resolve_thread.join();
}
for (const auto &socket : this->sockets) {
closesocket(socket);
}
this->sockets.clear();
this->sock_to_address.clear();
if (this->ai != nullptr) freeaddrinfo(this->ai);
}
/**
* Kill this connecter.
* It will abort as soon as it can and not call any of the callbacks.
*/
void TCPConnecter::Kill()
{
/* Delay the removing of the socket till the next CheckActivity(). */
this->killed = true;
}
/**
* Start a connection to the indicated address.
* @param address The address to connection to.
*/
void TCPConnecter::Connect(addrinfo *address)
{
SOCKET sock = socket(address->ai_family, address->ai_socktype, address->ai_protocol);
if (sock == INVALID_SOCKET) {
Debug(net, 0, "Could not create {} {} socket: {}", NetworkAddress::SocketTypeAsString(address->ai_socktype), NetworkAddress::AddressFamilyAsString(address->ai_family), NetworkError::GetLast().AsString());
return;
}
if (!SetReusePort(sock)) {
Debug(net, 0, "Setting reuse-port mode failed: {}", NetworkError::GetLast().AsString());
}
if (this->bind_address.GetPort() > 0) {
if (bind(sock, (const sockaddr *)this->bind_address.GetAddress(), this->bind_address.GetAddressLength()) != 0) {
Debug(net, 1, "Could not bind socket on {}: {}", this->bind_address.GetAddressAsString(), NetworkError::GetLast().AsString());
closesocket(sock);
return;
}
}
if (!SetNoDelay(sock)) {
Debug(net, 1, "Setting TCP_NODELAY failed: {}", NetworkError::GetLast().AsString());
}
if (!SetNonBlocking(sock)) {
Debug(net, 0, "Setting non-blocking mode failed: {}", NetworkError::GetLast().AsString());
}
NetworkAddress network_address = NetworkAddress(address->ai_addr, (int)address->ai_addrlen);
Debug(net, 5, "Attempting to connect to {}", network_address.GetAddressAsString());
int err = connect(sock, address->ai_addr, (int)address->ai_addrlen);
if (err != 0 && !NetworkError::GetLast().IsConnectInProgress()) {
closesocket(sock);
Debug(net, 1, "Could not connect to {}: {}", network_address.GetAddressAsString(), NetworkError::GetLast().AsString());
return;
}
this->sock_to_address[sock] = network_address;
this->sockets.push_back(sock);
}
/**
* Start the connect() for the next address in the list.
* @return True iff a new connect() is attempted.
*/
bool TCPConnecter::TryNextAddress()
{
if (this->current_address >= this->addresses.size()) return false;
this->last_attempt = std::chrono::steady_clock::now();
this->Connect(this->addresses[this->current_address++]);
return true;
}
/**
* Callback when resolving is done.
* @param ai A linked-list of address information.
*/
void TCPConnecter::OnResolved(addrinfo *ai)
{
std::deque<addrinfo *> addresses_ipv4, addresses_ipv6;
/* Apply "Happy Eyeballs" if it is likely IPv6 is functional. */
/* Detect if IPv6 is likely to succeed or not. */
bool seen_ipv6 = false;
bool resort = true;
for (addrinfo *runp = ai; runp != nullptr; runp = runp->ai_next) {
if (runp->ai_family == AF_INET6) {
seen_ipv6 = true;
} else if (!seen_ipv6) {
/* We see an IPv4 before an IPv6; this most likely means there is
* no IPv6 available on the system, so keep the order of this
* list. */
resort = false;
break;
}
}
/* Convert the addrinfo into NetworkAddresses. */
for (addrinfo *runp = ai; runp != nullptr; runp = runp->ai_next) {
/* Skip entries if the family is set and it is not matching. */
if (this->family != AF_UNSPEC && this->family != runp->ai_family) continue;
if (resort) {
if (runp->ai_family == AF_INET6) {
addresses_ipv6.emplace_back(runp);
} else {
addresses_ipv4.emplace_back(runp);
}
} else {
this->addresses.emplace_back(runp);
}
}
/* If we want to resort, make the list like IPv6 / IPv4 / IPv6 / IPv4 / ..
* for how ever many (round-robin) DNS entries we have. */
if (resort) {
while (!addresses_ipv4.empty() || !addresses_ipv6.empty()) {
if (!addresses_ipv6.empty()) {
this->addresses.push_back(addresses_ipv6.front());
addresses_ipv6.pop_front();
}
if (!addresses_ipv4.empty()) {
this->addresses.push_back(addresses_ipv4.front());
addresses_ipv4.pop_front();
}
}
}
if (_debug_net_level >= 6) {
if (this->addresses.size() == 0) {
Debug(net, 6, "{} did not resolve", this->connection_string);
} else {
Debug(net, 6, "{} resolved in:", this->connection_string);
for (const auto &address : this->addresses) {
Debug(net, 6, "- {}", NetworkAddress(address->ai_addr, (int)address->ai_addrlen).GetAddressAsString());
}
}
}
this->current_address = 0;
}
/**
* Start resolving the hostname.
*
* This function must change "status" to either Status::FAILURE
* or Status::CONNECTING before returning.
*/
void TCPConnecter::Resolve()
{
/* Port is already guaranteed part of the connection_string. */
NetworkAddress address = ParseConnectionString(this->connection_string, 0);
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_flags = AI_ADDRCONFIG;
hints.ai_socktype = SOCK_STREAM;
char port_name[6];
seprintf(port_name, lastof(port_name), "%u", address.GetPort());
static bool getaddrinfo_timeout_error_shown = false;
auto start = std::chrono::steady_clock::now();
addrinfo *ai;
int error = getaddrinfo(address.GetHostname().c_str(), port_name, &hints, &ai);
auto end = std::chrono::steady_clock::now();
auto duration = std::chrono::duration_cast<std::chrono::seconds>(end - start);
if (!getaddrinfo_timeout_error_shown && duration >= std::chrono::seconds(5)) {
Debug(net, 0, "getaddrinfo() for address \"{}\" took {} seconds", this->connection_string, duration.count());
Debug(net, 0, " This is likely an issue in the DNS name resolver's configuration causing it to time out");
getaddrinfo_timeout_error_shown = true;
}
if (error != 0) {
Debug(net, 0, "Failed to resolve DNS for {}", this->connection_string);
this->status = Status::Failure;
return;
}
this->ai = ai;
this->OnResolved(ai);
this->status = Status::Connecting;
}
/**
* Thunk to start Resolve() on the right instance.
*/
/* static */ void TCPConnecter::ResolveThunk(TCPConnecter *connecter)
{
connecter->Resolve();
}
/**
* Check if there was activity for this connecter.
* @return True iff the TCPConnecter is done and can be cleaned up.
*/
bool TCPConnecter::CheckActivity()
{
if (this->killed) return true;
switch (this->status) {
case Status::Init:
/* Start the thread delayed, so the vtable is loaded. This allows classes
* to overload functions used by Resolve() (in case threading is disabled). */
if (StartNewThread(&this->resolve_thread, "ottd:resolve", &TCPConnecter::ResolveThunk, this)) {
this->status = Status::Resolving;
return false;
}
/* No threads, do a blocking resolve. */
this->Resolve();
/* Continue as we are either failed or can start the first
* connection. The rest of this function handles exactly that. */
break;
case Status::Resolving:
/* Wait till Resolve() comes back with an answer (in case it runs threaded). */
return false;
case Status::Failure:
/* Ensure the OnFailure() is called from the game-thread instead of the
* resolve-thread, as otherwise we can get into some threading issues. */
this->OnFailure();
return true;
case Status::Connecting:
case Status::Connected:
break;
}
/* If there are no attempts pending, connect to the next. */
if (this->sockets.empty()) {
if (!this->TryNextAddress()) {
/* There were no more addresses to try, so we failed. */
this->OnFailure();
return true;
}
return false;
}
fd_set write_fd;
FD_ZERO(&write_fd);
for (const auto &socket : this->sockets) {
FD_SET(socket, &write_fd);
}
timeval tv;
tv.tv_usec = 0;
tv.tv_sec = 0;
int n = select(FD_SETSIZE, nullptr, &write_fd, nullptr, &tv);
/* select() failed; hopefully next try it doesn't. */
if (n < 0) {
/* select() normally never fails; so hopefully it works next try! */
Debug(net, 1, "select() failed: {}", NetworkError::GetLast().AsString());
return false;
}
/* No socket updates. */
if (n == 0) {
/* Wait 250ms between attempting another address. */
if (std::chrono::steady_clock::now() < this->last_attempt + std::chrono::milliseconds(250)) return false;
/* Try the next address in the list. */
if (this->TryNextAddress()) return false;
/* Wait up to 3 seconds since the last connection we started. */
if (std::chrono::steady_clock::now() < this->last_attempt + std::chrono::milliseconds(3000)) return false;
/* More than 3 seconds no socket reported activity, and there are no
* more address to try. Timeout the attempt. */
Debug(net, 0, "Timeout while connecting to {}", this->connection_string);
for (const auto &socket : this->sockets) {
closesocket(socket);
}
this->sockets.clear();
this->sock_to_address.clear();
this->OnFailure();
return true;
}
/* If a socket is writeable, it is either in error-state or connected.
* Remove all sockets that are in error-state and mark the first that is
* not in error-state as the socket we will use for our connection. */
SOCKET connected_socket = INVALID_SOCKET;
for (auto it = this->sockets.begin(); it != this->sockets.end(); /* nothing */) {
NetworkError socket_error = GetSocketError(*it);
if (socket_error.HasError()) {
Debug(net, 1, "Could not connect to {}: {}", this->sock_to_address[*it].GetAddressAsString(), socket_error.AsString());
closesocket(*it);
this->sock_to_address.erase(*it);
it = this->sockets.erase(it);
continue;
}
/* No error but writeable means connected. */
if (connected_socket == INVALID_SOCKET && FD_ISSET(*it, &write_fd)) {
connected_socket = *it;
}
it++;
}
/* All the writable sockets were in error state. So nothing is connected yet. */
if (connected_socket == INVALID_SOCKET) return false;
/* Close all sockets except the one we picked for our connection. */
for (auto it = this->sockets.begin(); it != this->sockets.end(); /* nothing */) {
if (connected_socket != *it) {
closesocket(*it);
}
this->sock_to_address.erase(*it);
it = this->sockets.erase(it);
}
Debug(net, 3, "Connected to {}", this->connection_string);
if (_debug_net_level >= 5) {
Debug(net, 5, "- using {}", NetworkAddress::GetPeerName(connected_socket));
}
this->OnConnect(connected_socket);
this->status = Status::Connected;
return true;
}
/**
* Check if there was activity for this connecter.
* @return True iff the TCPConnecter is done and can be cleaned up.
*/
bool TCPServerConnecter::CheckActivity()
{
if (this->killed) return true;
switch (this->server_address.type) {
case SERVER_ADDRESS_DIRECT:
return TCPConnecter::CheckActivity();
case SERVER_ADDRESS_INVITE_CODE:
/* Check if a result has come in. */
switch (this->status) {
case Status::Failure:
this->OnFailure();
return true;
case Status::Connected:
this->OnConnect(this->socket);
return true;
default:
break;
}
return false;
default:
NOT_REACHED();
}
}
/**
* The connection was successfully established.
* This socket is fully setup and ready to send/recv game protocol packets.
* @param sock The socket of the established connection.
*/
void TCPServerConnecter::SetConnected(SOCKET sock)
{
assert(sock != INVALID_SOCKET);
this->socket = sock;
this->status = Status::Connected;
}
/**
* The connection couldn't be established.
*/
void TCPServerConnecter::SetFailure()
{
this->status = Status::Failure;
}
/**
* Check whether we need to call the callback, i.e. whether we
* have connected or aborted and call the appropriate callback
* for that. It's done this way to ease on the locking that
* would otherwise be needed everywhere.
*/
/* static */ void TCPConnecter::CheckCallbacks()
{
for (auto iter = _tcp_connecters.begin(); iter < _tcp_connecters.end(); /* nothing */) {
TCPConnecter *cur = *iter;
if (cur->CheckActivity()) {
iter = _tcp_connecters.erase(iter);
delete cur;
} else {
iter++;
}
}
}
/** Kill all connection attempts. */
/* static */ void TCPConnecter::KillAll()
{
for (auto iter = _tcp_connecters.begin(); iter < _tcp_connecters.end(); /* nothing */) {
TCPConnecter *cur = *iter;
iter = _tcp_connecters.erase(iter);
delete cur;
}
}
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