// Copyright (c) 2012-2015, The CryptoNote developers, The Bytecoin developers
//
// This file is part of Bytecoin.
//
// Bytecoin is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Bytecoin 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Bytecoin. If not, see .
#include "TcpConnector.h"
#include
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include
#include
#include
#include
#include "Dispatcher.h"
#include "TcpConnection.h"
namespace System {
namespace {
struct TcpConnectorContext : public OVERLAPPED {
NativeContext* context;
size_t connection;
bool interrupted;
};
LPFN_CONNECTEX connectEx = nullptr;
}
TcpConnector::TcpConnector() : dispatcher(nullptr) {
}
TcpConnector::TcpConnector(Dispatcher& dispatcher) : dispatcher(&dispatcher), context(nullptr) {
}
TcpConnector::TcpConnector(TcpConnector&& other) : dispatcher(other.dispatcher) {
if (dispatcher != nullptr) {
assert(other.context == nullptr);
context = nullptr;
other.dispatcher = nullptr;
}
}
TcpConnector::~TcpConnector() {
assert(dispatcher == nullptr || context == nullptr);
}
TcpConnector& TcpConnector::operator=(TcpConnector&& other) {
assert(dispatcher == nullptr || context == nullptr);
dispatcher = other.dispatcher;
if (dispatcher != nullptr) {
assert(other.context == nullptr);
context = nullptr;
other.dispatcher = nullptr;
}
return *this;
}
TcpConnection TcpConnector::connect(const Ipv4Address& address, uint16_t port) {
assert(dispatcher != nullptr);
assert(context == nullptr);
if (dispatcher->interrupted()) {
throw InterruptedException();
}
std::string message;
SOCKET connection = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (connection == INVALID_SOCKET) {
message = "socket failed, result=" + std::to_string(WSAGetLastError());
} else {
sockaddr_in bindAddress;
bindAddress.sin_family = AF_INET;
bindAddress.sin_port = 0;
bindAddress.sin_addr.s_addr = INADDR_ANY;
if (bind(connection, reinterpret_cast(&bindAddress), sizeof bindAddress) != 0) {
message = "bind failed, result=" + std::to_string(WSAGetLastError());
} else {
GUID guidConnectEx = WSAID_CONNECTEX;
DWORD read = sizeof connectEx;
if (connectEx == nullptr && WSAIoctl(connection, SIO_GET_EXTENSION_FUNCTION_POINTER, &guidConnectEx, sizeof guidConnectEx, &connectEx, sizeof connectEx, &read, NULL, NULL) != 0) {
message = "WSAIoctl failed, result=" + std::to_string(WSAGetLastError());
} else {
assert(read == sizeof connectEx);
if (CreateIoCompletionPort(reinterpret_cast(connection), dispatcher->getCompletionPort(), 0, 0) != dispatcher->getCompletionPort()) {
message = "CreateIoCompletionPort failed, result=" + std::to_string(GetLastError());
} else {
sockaddr_in addressData;
addressData.sin_family = AF_INET;
addressData.sin_port = htons(port);
addressData.sin_addr.S_un.S_addr = htonl(address.getValue());
TcpConnectorContext context2;
context2.hEvent = NULL;
if (connectEx(connection, reinterpret_cast(&addressData), sizeof addressData, NULL, 0, NULL, &context2) == TRUE) {
message = "ConnectEx returned immediately, which is not supported.";
} else {
int lastError = WSAGetLastError();
if (lastError != WSA_IO_PENDING) {
message = "ConnectEx failed, result=" + std::to_string(lastError);
} else {
context2.context = dispatcher->getCurrentContext();
context2.connection = connection;
context2.interrupted = false;
context = &context2;
dispatcher->getCurrentContext()->interruptProcedure = [&]() {
assert(dispatcher != nullptr);
assert(context != nullptr);
TcpConnectorContext* context2 = static_cast(context);
if (!context2->interrupted) {
if (CancelIoEx(reinterpret_cast(context2->connection), context2) != TRUE) {
DWORD lastError = GetLastError();
if (lastError != ERROR_NOT_FOUND) {
throw std::runtime_error("TcpConnector::stop, CancelIoEx failed, result=" + std::to_string(GetLastError()));
}
context2->context->interrupted = true;
}
context2->interrupted = true;
}
};
dispatcher->dispatch();
dispatcher->getCurrentContext()->interruptProcedure = nullptr;
assert(context2.context == dispatcher->getCurrentContext());
assert(context2.connection == connection);
assert(dispatcher != nullptr);
assert(context == &context2);
context = nullptr;
DWORD transferred;
DWORD flags;
if (WSAGetOverlappedResult(connection, &context2, &transferred, FALSE, &flags) != TRUE) {
lastError = WSAGetLastError();
if (lastError != ERROR_OPERATION_ABORTED) {
message = "ConnectEx failed, result=" + std::to_string(lastError);
} else {
assert(context2.interrupted);
if (closesocket(connection) != 0) {
throw std::runtime_error("TcpConnector::connect, closesocket failed, result=" + std::to_string(WSAGetLastError()));
} else {
throw InterruptedException();
}
}
} else {
assert(transferred == 0);
assert(flags == 0);
DWORD value = 1;
if (setsockopt(connection, SOL_SOCKET, SO_UPDATE_CONNECT_CONTEXT, reinterpret_cast(&value), sizeof(value)) != 0) {
message = "setsockopt failed, result=" + std::to_string(WSAGetLastError());
} else {
return TcpConnection(*dispatcher, connection);
}
}
}
}
}
}
}
int result = closesocket(connection);
assert(result == 0);
}
throw std::runtime_error("TcpConnector::connect, " + message);
}
}