195 lines
6.5 KiB
C++
195 lines
6.5 KiB
C++
// Copyright (c) 2011-2016 The Cryptonote developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "TcpListener.h"
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#include <cassert>
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <winsock2.h>
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#include <mswsock.h>
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#include <System/InterruptedException.h>
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#include <System/Ipv4Address.h>
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#include "Dispatcher.h"
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#include "ErrorMessage.h"
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#include "TcpConnection.h"
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namespace System {
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namespace {
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struct TcpListenerContext : public OVERLAPPED {
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NativeContext* context;
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bool interrupted;
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};
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LPFN_ACCEPTEX acceptEx = nullptr;
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}
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TcpListener::TcpListener() : dispatcher(nullptr) {
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}
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TcpListener::TcpListener(Dispatcher& dispatcher, const Ipv4Address& address, uint16_t port) : dispatcher(&dispatcher) {
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std::string message;
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listener = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (listener == INVALID_SOCKET) {
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message = "socket failed, " + errorMessage(WSAGetLastError());
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} else {
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sockaddr_in addressData;
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addressData.sin_family = AF_INET;
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addressData.sin_port = htons(port);
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addressData.sin_addr.S_un.S_addr = htonl(address.getValue());
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if (bind(listener, reinterpret_cast<sockaddr*>(&addressData), sizeof(addressData)) != 0) {
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message = "bind failed, " + errorMessage(WSAGetLastError());
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} else if (listen(listener, SOMAXCONN) != 0) {
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message = "listen failed, " + errorMessage(WSAGetLastError());
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} else {
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GUID guidAcceptEx = WSAID_ACCEPTEX;
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DWORD read = sizeof acceptEx;
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if (acceptEx == nullptr && WSAIoctl(listener, SIO_GET_EXTENSION_FUNCTION_POINTER, &guidAcceptEx, sizeof guidAcceptEx, &acceptEx, sizeof acceptEx, &read, NULL, NULL) != 0) {
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message = "WSAIoctl failed, " + errorMessage(WSAGetLastError());
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} else {
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assert(read == sizeof acceptEx);
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if (CreateIoCompletionPort(reinterpret_cast<HANDLE>(listener), dispatcher.getCompletionPort(), 0, 0) != dispatcher.getCompletionPort()) {
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message = "CreateIoCompletionPort failed, " + lastErrorMessage();
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} else {
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context = nullptr;
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return;
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}
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}
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}
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int result = closesocket(listener);
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assert(result == 0);
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}
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throw std::runtime_error("TcpListener::TcpListener, " + message);
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}
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TcpListener::TcpListener(TcpListener&& other) : dispatcher(other.dispatcher) {
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if (dispatcher != nullptr) {
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assert(other.context == nullptr);
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listener = other.listener;
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context = nullptr;
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other.dispatcher = nullptr;
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}
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}
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TcpListener::~TcpListener() {
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if (dispatcher != nullptr) {
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assert(context == nullptr);
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int result = closesocket(listener);
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assert(result == 0);
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}
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}
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TcpListener& TcpListener::operator=(TcpListener&& other) {
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if (dispatcher != nullptr) {
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assert(context == nullptr);
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if (closesocket(listener) != 0) {
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throw std::runtime_error("TcpListener::operator=, closesocket failed, " + errorMessage(WSAGetLastError()));
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}
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}
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dispatcher = other.dispatcher;
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if (dispatcher != nullptr) {
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assert(other.context == nullptr);
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listener = other.listener;
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context = nullptr;
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other.dispatcher = nullptr;
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}
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return *this;
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}
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TcpConnection TcpListener::accept() {
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assert(dispatcher != nullptr);
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assert(context == nullptr);
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if (dispatcher->interrupted()) {
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throw InterruptedException();
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}
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std::string message;
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SOCKET connection = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (connection == INVALID_SOCKET) {
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message = "socket failed, " + errorMessage(WSAGetLastError());
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} else {
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uint8_t addresses[sizeof sockaddr_in * 2 + 32];
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DWORD received;
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TcpListenerContext context2;
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context2.hEvent = NULL;
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if (acceptEx(listener, connection, addresses, 0, sizeof(sockaddr_in) + 16, sizeof(sockaddr_in) + 16, &received, &context2) == TRUE) {
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message = "AcceptEx returned immediately, which is not supported.";
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} else {
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int lastError = WSAGetLastError();
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if (lastError != WSA_IO_PENDING) {
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message = "AcceptEx failed, " + errorMessage(lastError);
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} else {
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context2.context = dispatcher->getCurrentContext();
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context2.interrupted = false;
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context = &context2;
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dispatcher->getCurrentContext()->interruptProcedure = [&]() {
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assert(dispatcher != nullptr);
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assert(context != nullptr);
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TcpListenerContext* context2 = static_cast<TcpListenerContext*>(context);
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if (!context2->interrupted) {
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if (CancelIoEx(reinterpret_cast<HANDLE>(listener), context2) != TRUE) {
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DWORD lastError = GetLastError();
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if (lastError != ERROR_NOT_FOUND) {
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throw std::runtime_error("TcpListener::stop, CancelIoEx failed, " + lastErrorMessage());
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}
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context2->context->interrupted = true;
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}
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context2->interrupted = true;
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}
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};
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dispatcher->dispatch();
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dispatcher->getCurrentContext()->interruptProcedure = nullptr;
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assert(context2.context == dispatcher->getCurrentContext());
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assert(dispatcher != nullptr);
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assert(context == &context2);
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context = nullptr;
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DWORD transferred;
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DWORD flags;
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if (WSAGetOverlappedResult(listener, &context2, &transferred, FALSE, &flags) != TRUE) {
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lastError = WSAGetLastError();
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if (lastError != ERROR_OPERATION_ABORTED) {
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message = "AcceptEx failed, " + errorMessage(lastError);
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} else {
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assert(context2.interrupted);
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if (closesocket(connection) != 0) {
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throw std::runtime_error("TcpListener::accept, closesocket failed, " + errorMessage(WSAGetLastError()));
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} else {
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throw InterruptedException();
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}
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}
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} else {
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assert(transferred == 0);
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assert(flags == 0);
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if (setsockopt(connection, SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT, reinterpret_cast<char*>(&listener), sizeof listener) != 0) {
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message = "setsockopt failed, " + errorMessage(WSAGetLastError());
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} else {
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if (CreateIoCompletionPort(reinterpret_cast<HANDLE>(connection), dispatcher->getCompletionPort(), 0, 0) != dispatcher->getCompletionPort()) {
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message = "CreateIoCompletionPort failed, " + lastErrorMessage();
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} else {
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return TcpConnection(*dispatcher, connection);
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}
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}
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}
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}
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}
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int result = closesocket(connection);
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assert(result == 0);
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}
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throw std::runtime_error("TcpListener::accept, " + message);
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}
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}
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