/* * Copyright (c) 2010-2016 Isode Limited. * All rights reserved. * See the COPYING file for more information. */ #include <Swiften/Network/Connector.h> #include <boost/bind.hpp> #include <Swiften/Base/Log.h> #include <Swiften/Network/ConnectionFactory.h> #include <Swiften/Network/DomainNameAddressQuery.h> #include <Swiften/Network/DomainNameResolver.h> #include <Swiften/Network/HostAddress.h> #include <Swiften/Network/TimerFactory.h> namespace Swift { Connector::Connector(const std::string& hostname, int port, const boost::optional<std::string>& serviceLookupPrefix, DomainNameResolver* resolver, ConnectionFactory* connectionFactory, TimerFactory* timerFactory) : hostname(hostname), port(port), serviceLookupPrefix(serviceLookupPrefix), resolver(resolver), connectionFactory(connectionFactory), timerFactory(timerFactory), timeoutMilliseconds(0), queriedAllServices(true), foundSomeDNS(false) { } void Connector::setTimeoutMilliseconds(int milliseconds) { timeoutMilliseconds = milliseconds; } void Connector::start() { SWIFT_LOG(debug) << "Starting connector for " << hostname << std::endl; assert(!currentConnection); assert(!serviceQuery); assert(!timer); queriedAllServices = false; if (timeoutMilliseconds > 0) { timer = timerFactory->createTimer(timeoutMilliseconds); timer->onTick.connect(boost::bind(&Connector::handleTimeout, shared_from_this())); } if (serviceLookupPrefix) { serviceQuery = resolver->createServiceQuery(*serviceLookupPrefix, hostname); serviceQuery->onResult.connect(boost::bind(&Connector::handleServiceQueryResult, shared_from_this(), _1)); serviceQuery->run(); } else if (HostAddress(hostname).isValid()) { // hostname is already a valid address; skip name lookup. foundSomeDNS = true; addressQueryResults.push_back(HostAddress(hostname)); tryNextAddress(); } else { queryAddress(hostname); } } void Connector::stop() { if (currentConnection) { currentConnection->onConnectFinished.disconnect(boost::bind(&Connector::handleConnectionConnectFinished, shared_from_this(), _1)); currentConnection->disconnect(); } finish(std::shared_ptr<Connection>()); } void Connector::queryAddress(const std::string& hostname) { assert(!addressQuery); addressQuery = resolver->createAddressQuery(hostname); addressQuery->onResult.connect(boost::bind(&Connector::handleAddressQueryResult, shared_from_this(), _1, _2)); addressQuery->run(); } void Connector::handleServiceQueryResult(const std::vector<DomainNameServiceQuery::Result>& result) { SWIFT_LOG(debug) << result.size() << " SRV result(s)" << std::endl; serviceQueryResults = std::deque<DomainNameServiceQuery::Result>(result.begin(), result.end()); serviceQuery.reset(); if (!serviceQueryResults.empty()) { foundSomeDNS = true; } tryNextServiceOrFallback(); } void Connector::tryNextServiceOrFallback() { if (queriedAllServices) { SWIFT_LOG(debug) << "Queried all services" << std::endl; finish(std::shared_ptr<Connection>()); } else if (serviceQueryResults.empty()) { SWIFT_LOG(debug) << "Falling back on A resolution" << std::endl; // Fall back on simple address resolving queriedAllServices = true; queryAddress(hostname); } else { SWIFT_LOG(debug) << "Querying next address" << std::endl; queryAddress(serviceQueryResults.front().hostname); } } void Connector::handleAddressQueryResult(const std::vector<HostAddress>& addresses, boost::optional<DomainNameResolveError> error) { SWIFT_LOG(debug) << addresses.size() << " addresses" << std::endl; addressQuery.reset(); if (error || addresses.empty()) { if (!serviceQueryResults.empty()) { serviceQueryResults.pop_front(); } tryNextServiceOrFallback(); } else { foundSomeDNS = true; addressQueryResults = std::deque<HostAddress>(addresses.begin(), addresses.end()); tryNextAddress(); } } void Connector::tryNextAddress() { if (addressQueryResults.empty()) { SWIFT_LOG(debug) << "Done trying addresses. Moving on." << std::endl; // Done trying all addresses. Move on to the next host. if (!serviceQueryResults.empty()) { serviceQueryResults.pop_front(); } tryNextServiceOrFallback(); } else { SWIFT_LOG(debug) << "Trying next address" << std::endl; HostAddress address = addressQueryResults.front(); addressQueryResults.pop_front(); int connectPort = (port == -1 ? 5222 : port); if (!serviceQueryResults.empty()) { connectPort = serviceQueryResults.front().port; } tryConnect(HostAddressPort(address, connectPort)); } } void Connector::tryConnect(const HostAddressPort& target) { assert(!currentConnection); SWIFT_LOG(debug) << "Trying to connect to " << target.getAddress().toString() << ":" << target.getPort() << std::endl; currentConnection = connectionFactory->createConnection(); currentConnection->onConnectFinished.connect(boost::bind(&Connector::handleConnectionConnectFinished, shared_from_this(), _1)); currentConnection->connect(target); if (timer) { timer->start(); } } void Connector::handleConnectionConnectFinished(bool error) { SWIFT_LOG(debug) << "ConnectFinished: " << (error ? "error" : "success") << std::endl; if (timer) { timer->stop(); timer.reset(); } currentConnection->onConnectFinished.disconnect(boost::bind(&Connector::handleConnectionConnectFinished, shared_from_this(), _1)); if (error) { currentConnection.reset(); if (!addressQueryResults.empty()) { tryNextAddress(); } else { if (!serviceQueryResults.empty()) { serviceQueryResults.pop_front(); } tryNextServiceOrFallback(); } } else { finish(currentConnection); } } void Connector::finish(std::shared_ptr<Connection> connection) { if (timer) { timer->stop(); timer->onTick.disconnect(boost::bind(&Connector::handleTimeout, shared_from_this())); timer.reset(); } if (serviceQuery) { serviceQuery->onResult.disconnect(boost::bind(&Connector::handleServiceQueryResult, shared_from_this(), _1)); serviceQuery.reset(); } if (addressQuery) { addressQuery->onResult.disconnect(boost::bind(&Connector::handleAddressQueryResult, shared_from_this(), _1, _2)); addressQuery.reset(); } if (currentConnection) { currentConnection->onConnectFinished.disconnect(boost::bind(&Connector::handleConnectionConnectFinished, shared_from_this(), _1)); currentConnection.reset(); } onConnectFinished(connection, (connection || foundSomeDNS) ? std::shared_ptr<Error>() : std::make_shared<DomainNameResolveError>()); } void Connector::handleTimeout() { SWIFT_LOG(debug) << "Timeout" << std::endl; handleConnectionConnectFinished(true); } }