214 lines
7.1 KiB
C++
214 lines
7.1 KiB
C++
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// Copyright (c) 2012-2014, The CryptoNote developers, The Bytecoin developers
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//
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// This file is part of Bytecoin.
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//
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// Bytecoin is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Bytecoin is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with Bytecoin. If not, see <http://www.gnu.org/licenses/>.
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#include "TcpConnector.h"
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#include <stdexcept>
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#include <iostream>
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#include <random>
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#include <sstream>
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#include <cassert>
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#include <netdb.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/epoll.h>
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#include <sys/socket.h>
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#include "Dispatcher.h"
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#include "TcpConnection.h"
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#include "InterruptedException.h"
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using namespace System;
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namespace {
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struct ConnectorContext : public Dispatcher::ContextExt {
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int connection;
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bool interrupted;
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};
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}
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TcpConnector::TcpConnector() : dispatcher(nullptr) {
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}
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TcpConnector::TcpConnector(Dispatcher& dispatcher, const std::string& address, uint16_t port) : dispatcher(&dispatcher), address(address), port(port), stopped(false), context(nullptr) {
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}
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TcpConnector::TcpConnector(TcpConnector&& other) : dispatcher(other.dispatcher) {
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if (other.dispatcher != nullptr) {
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address = other.address;
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port = other.port;
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stopped = other.stopped;
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context = other.context;
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other.dispatcher = nullptr;
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}
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}
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TcpConnector::~TcpConnector() {
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}
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TcpConnector& TcpConnector::operator=(TcpConnector&& other) {
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dispatcher = other.dispatcher;
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if (other.dispatcher != nullptr) {
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address = other.address;
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port = other.port;
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stopped = other.stopped;
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context = other.context;
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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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void TcpConnector::start() {
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assert(dispatcher != nullptr);
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assert(stopped);
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stopped = false;
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}
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TcpConnection TcpConnector::connect() {
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assert(dispatcher != nullptr);
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assert(context == nullptr);
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if (stopped) {
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throw InterruptedException();
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}
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std::ostringstream portStream;
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portStream << port;
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addrinfo hints = { 0, AF_INET, SOCK_STREAM, IPPROTO_TCP, 0, NULL, NULL, NULL };
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addrinfo *addressInfos;
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int result = getaddrinfo(address.c_str(), portStream.str().c_str(), &hints, &addressInfos);
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if (result == -1) {
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std::cerr << "getaddrinfo failed, errno=" << errno << '.' << std::endl;
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} else {
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std::size_t count = 0;
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for (addrinfo* addressInfo = addressInfos; addressInfo != nullptr; addressInfo = addressInfo->ai_next) {
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++count;
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}
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std::random_device randomDevice;
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std::mt19937 generator(randomDevice());
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std::uniform_int_distribution<std::size_t> distribution(0, count - 1);
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std::size_t index = distribution(generator);
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addrinfo* addressInfo = addressInfos;
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for (std::size_t i = 0; i < index; ++i) {
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addressInfo = addressInfo->ai_next;
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}
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sockaddr_in addressData = *reinterpret_cast<sockaddr_in*>(addressInfo->ai_addr);
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freeaddrinfo(addressInfo);
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int connection = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (connection == -1) {
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std::cerr << "socket failed, errno=" << errno << '.' << std::endl;
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} else {
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sockaddr_in bindAddress;
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bindAddress.sin_family = AF_INET;
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bindAddress.sin_port = 0;
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bindAddress.sin_addr.s_addr = INADDR_ANY;
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if (bind(connection, reinterpret_cast<sockaddr*>(&bindAddress), sizeof bindAddress) != 0) {
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std::cerr << "bind failed, errno=" << errno << '.' << std::endl;
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} else {
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int flags = fcntl(connection, F_GETFL, 0);
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if (flags == -1 || fcntl(connection, F_SETFL, flags | O_NONBLOCK) == -1) {
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std::cerr << "fcntl() failed errno=" << errno << std::endl;
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} else {
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int result = ::connect(connection, reinterpret_cast<sockaddr *>(&addressData), sizeof addressData);
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if (result == -1) {
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if (errno == EINPROGRESS) {
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ConnectorContext context2;
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context2.writeContext = dispatcher->getCurrentContext();
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context2.context = nullptr;
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context2.interrupted = false;
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context2.connection = connection;
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context = &context2;
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epoll_event connectEvent;
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connectEvent.data.fd = connection;
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connectEvent.events = EPOLLOUT | EPOLLRDHUP | EPOLLERR | EPOLLONESHOT;
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connectEvent.data.ptr = context;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_ADD, connection, &connectEvent) == -1) {
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std::cerr << "epoll_ctl() failed, errno=" << errno << '.' << std::endl;
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} else {
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dispatcher->yield();
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assert(dispatcher != nullptr);
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assert(context2.writeContext == dispatcher->getCurrentContext());
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assert(context == &context2);
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context = nullptr;
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context2.writeContext = nullptr;
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if (context2.interrupted) {
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if (close(connection) == -1) {
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std::cerr << "close failed, errno=" << errno << std::endl;
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}
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throw InterruptedException();
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}
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_DEL, connection, NULL) == -1) {
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std::cerr << "epoll_ctl() failed, errno=" << errno << '.' << std::endl;
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} else {
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int retval = -1;
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socklen_t retValLen = sizeof(retval);
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int s = getsockopt(connection, SOL_SOCKET, SO_ERROR, &retval, &retValLen);
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if (s == -1) {
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std::cerr << "getsockopt() failed, errno=" << errno << '.' << std::endl;
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} else {
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if (retval != 0) {
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std::cerr << "connect failed; getsockopt retval = " << retval << std::endl;
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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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} 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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if (close(connection) == -1) {
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std::cerr << "close failed, errno=" << errno << std::endl;
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}
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}
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}
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throw std::runtime_error("TcpConnector::connect");
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}
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void TcpConnector::stop() {
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assert(dispatcher != nullptr);
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assert(!stopped);
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if (context != nullptr) {
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ConnectorContext* context2 = static_cast<ConnectorContext*>(context);
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if (!context2->interrupted) {
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_DEL, context2->connection, NULL) == -1) {
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std::cerr << "epoll_ctl() failed, errno=" << errno << '.' << std::endl;
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throw std::runtime_error("TcpConnector::stop");
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}
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dispatcher->pushContext(context2->writeContext);
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context2->interrupted = true;
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}
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}
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stopped = true;
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}
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