2015-05-27 12:08:46 +00:00
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// Copyright (c) 2012-2015, The CryptoNote developers, The Bytecoin developers
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2015-04-06 16:13:07 +00:00
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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 <cassert>
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2015-05-27 12:08:46 +00:00
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#include <stdexcept>
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2015-04-06 16:13:07 +00:00
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#include <fcntl.h>
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2015-05-27 12:08:46 +00:00
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#include <netdb.h>
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2015-04-06 16:13:07 +00:00
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#include <unistd.h>
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#include <sys/epoll.h>
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2015-05-27 12:08:46 +00:00
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#include <System/InterruptedException.h>
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#include <System/Ipv4Address.h>
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2015-04-06 16:13:07 +00:00
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#include "Dispatcher.h"
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#include "TcpConnection.h"
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2015-05-27 12:08:46 +00:00
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namespace System {
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2015-04-06 16:13:07 +00:00
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namespace {
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2015-07-30 15:22:07 +00:00
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struct TcpConnectorContextExt : public OperationContext {
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int connection;
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};
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}
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TcpConnector::TcpConnector() : dispatcher(nullptr) {
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}
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2015-07-30 15:22:07 +00:00
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TcpConnector::TcpConnector(Dispatcher& dispatcher) : dispatcher(&dispatcher), context(nullptr) {
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2015-04-06 16:13:07 +00:00
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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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2015-05-27 12:08:46 +00:00
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assert(other.context == nullptr);
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context = nullptr;
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2015-04-06 16:13:07 +00:00
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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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assert(other.context == nullptr);
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context = nullptr;
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2015-04-06 16:13:07 +00:00
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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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2015-05-27 12:08:46 +00:00
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TcpConnection TcpConnector::connect(const Ipv4Address& address, uint16_t port) {
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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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2015-05-27 12:08:46 +00:00
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std::string message;
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int connection = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (connection == -1) {
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message = "socket() failed, errno=" + std::to_string(errno);
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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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message = "bind failed, errno=" + std::to_string(errno);
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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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message = "fcntl() failed errno=" + std::to_string(errno);
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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_addr = htonl(address.getValue());
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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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ContextPair contextPair;
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TcpConnectorContextExt connectorContext;
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connectorContext.interrupted = false;
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connectorContext.context = dispatcher->getCurrentContext();
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connectorContext.connection = connection;
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contextPair.readContext = nullptr;
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contextPair.writeContext = &connectorContext;
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epoll_event connectEvent;
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connectEvent.events = EPOLLOUT | EPOLLRDHUP | EPOLLERR | EPOLLONESHOT;
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connectEvent.data.ptr = &contextPair;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_ADD, connection, &connectEvent) == -1) {
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message = "epoll_ctl() failed, errno=" + std::to_string(errno);
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} else {
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context = &connectorContext;
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dispatcher->getCurrentContext()->interruptProcedure = [&] {
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TcpConnectorContextExt* connectorContext1 = static_cast<TcpConnectorContextExt*>(context);
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if (!connectorContext1->interrupted) {
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if (close(connectorContext1->connection) == -1) {
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throw std::runtime_error("TcpListener::stop, close failed, errno=" + std::to_string(errno));
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}
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connectorContext1->interrupted = true;
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dispatcher->pushContext(connectorContext1->context);
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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(dispatcher != nullptr);
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assert(connectorContext.context == dispatcher->getCurrentContext());
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assert(contextPair.readContext == nullptr);
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assert(context == &connectorContext);
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context = nullptr;
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connectorContext.context = nullptr;
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if (connectorContext.interrupted) {
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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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message = "epoll_ctl() failed, errno=" + std::to_string(errno);
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} else {
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if((connectorContext.events & (EPOLLERR | EPOLLHUP)) != 0) {
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int result = close(connection);
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assert(result != -1);
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2015-05-27 12:08:46 +00:00
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throw std::runtime_error("TcpConnector::connect, connection failed");
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2015-04-06 16:13:07 +00:00
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}
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2015-05-27 12:08:46 +00:00
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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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message = "getsockopt() failed, errno=" + std::to_string(errno);
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} else {
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if (retval != 0) {
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message = "connect failed; getsockopt retval =" + std::to_string(errno);
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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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2015-05-27 12:08:46 +00:00
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} else {
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return TcpConnection(*dispatcher, connection);
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2015-04-06 16:13:07 +00:00
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}
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}
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}
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2015-05-27 12:08:46 +00:00
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int result = close(connection);
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assert(result != -1);
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}
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2015-04-06 16:13:07 +00:00
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2015-05-27 12:08:46 +00:00
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throw std::runtime_error("TcpConnector::connect, "+message);
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}
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2015-04-06 16:13:07 +00:00
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}
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