600 lines
24 KiB
C++
600 lines
24 KiB
C++
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* *
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* Copyright (C) 2018 Michael Zanetti <michael.zanetti@guh.io> *
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* *
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* This file is part of nymea. *
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* *
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* nymea is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, version 2 of the License. *
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* *
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* nymea 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 General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with nymea. If not, see <http://www.gnu.org/licenses/>. *
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* *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include "mqttserver.h"
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#include "mqttserver_p.h"
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#include "mqttpacket.h"
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#include <QDebug>
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#include <QDataStream>
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#include <QUuid>
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#include <QtGlobal>
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#include <QRegExp>
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Q_LOGGING_CATEGORY(dbgServer, "nymea.mqtt.server")
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MqttServerPrivate::MqttServerPrivate(MqttServer *q):
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QObject(q),
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q_ptr(q)
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{
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qRegisterMetaType<Mqtt::QoS>();
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server = new QTcpServer(this);
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connect(server, &QTcpServer::newConnection, this, &MqttServerPrivate::onNewConnection);
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}
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QHash<QString, quint16> MqttServerPrivate::publish(const QString &topic, const QByteArray &payload)
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{
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QHash<QTcpSocket*, Mqtt::QoS> receivers;
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foreach (QTcpSocket *c, clientList.keys()) {
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foreach (const MqttSubscription &subscription, clientList.value(c)->subscriptions) {
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if (matchTopic(subscription.topicFilter(), topic)) {
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if (!receivers.contains(c) || receivers.value(c) < subscription.qoS()) {
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receivers[c] = subscription.qoS();
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}
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}
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}
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}
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QHash<QString, quint16> packets;
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foreach (QTcpSocket *receiver, receivers.keys()) {
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ClientContext *ctx = clientList.value(receiver);
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qCDebug(dbgServer) << "Relaying packet to subscribed client:" << ctx->clientId;
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Mqtt::QoS qos = receivers.value(receiver);
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MqttPacket packet(MqttPacket::TypePublish, qos >= Mqtt::QoS0 ? newPacketId(ctx) : 0, qos);
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packet.setTopic(topic.toUtf8());
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packet.setPayload(payload);
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receiver->write(packet.serialize());
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packets.insert(ctx->clientId, packet.packetId());
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if (packet.qos() == Mqtt::QoS0) {
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QString clientId = ctx->clientId;
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QTimer::singleShot(0, this, [this, clientId, packet](){
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emit q_ptr->published(clientId, packet.packetId(), packet.topic(), packet.payload());
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});
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} else {
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ClientContext *ctx = clientList.value(receiver);
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ctx->unackedPackets.insert(packet.packetId(), packet);
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ctx->unackedPacketList.append(packet.packetId());
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}
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}
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return packets;
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}
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MqttServer::MqttServer(QObject *parent):
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QObject(parent),
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d_ptr(new MqttServerPrivate(this))
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{
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}
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Mqtt::QoS MqttServer::maximumSubscriptionsQoS() const
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{
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return d_ptr->maximumSubscriptionQoS;
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}
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void MqttServer::setMaximumSubscriptionsQoS(Mqtt::QoS maximumSubscriptionQoS)
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{
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d_ptr->maximumSubscriptionQoS = maximumSubscriptionQoS;
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}
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bool MqttServer::listen(const QHostAddress &address, quint16 port, MqttUserValidator *userValidator)
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{
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d_ptr->userValidator = userValidator;
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if (!d_ptr->server->listen(address, port)) {
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qCWarning(dbgServer()) << "Error listening on port" << port;
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return false;
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}
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qCDebug(dbgServer) << "nymea MQTT server running on" << address.toString() << ":" << port;
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return true;
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}
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bool MqttServer::isListening() const
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{
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return d_ptr->server->isListening();
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}
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void MqttServer::close()
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{
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d_ptr->server->close();
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}
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QStringList MqttServer::clients() const
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{
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QStringList clientIds;
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foreach (ClientContext *ctx, d_ptr->clientList) {
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clientIds << ctx->clientId;
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}
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return clientIds;
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}
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QHash<QString, quint16> MqttServer::publish(const QString &topic, const QByteArray &payload)
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{
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return d_ptr->publish(topic, payload);
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}
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void MqttServerPrivate::onNewConnection()
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{
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QTcpSocket *client = server->nextPendingConnection();
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// Start a 10 second timer to clean up the connection if we don't get data until then.
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QTimer *timeoutTimer = new QTimer(this);
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connect(timeoutTimer, &QTimer::timeout, this, [this, client]() {
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qCWarning(dbgServer) << "A client connected but did not send data in 10 seconds. Dropping connection.";
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client->abort();
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pendingConnections.take(client)->deleteLater();
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client->deleteLater();
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});
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timeoutTimer->start(10000);
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pendingConnections.insert(client, timeoutTimer);
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connect(client, &QTcpSocket::readyRead, this, &MqttServerPrivate::onClientReadyRead);
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connect(client, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(onClientError(QAbstractSocket::SocketError)));
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connect(client, &QTcpSocket::disconnected, this, &MqttServerPrivate::onClientDisconnected);
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}
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void MqttServerPrivate::onClientDisconnected()
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{
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QTcpSocket *client = static_cast<QTcpSocket*>(sender());
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cleanupClient(client);
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}
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void MqttServerPrivate::cleanupClient(QTcpSocket *client)
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{
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if (clientBuffers.contains(client)) {
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clientBuffers.remove(client);
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}
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if (clientList.contains(client)) {
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ClientContext *ctx = clientList.value(client);
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qCDebug(dbgServer) << "Client" << ctx->clientId << "disconnected.";
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ctx->keepAliveTimer.stop();
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if (!ctx->willTopic.isEmpty()) {
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qCDebug(dbgServer) << "Publishing will message for client" << ctx->clientId << "on topic" << ctx->willTopic << "( Retain:" << ctx->willRetain << ")";
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MqttPacket willPacket(MqttPacket::TypePublish, ctx->willQoS >= Mqtt::QoS1 ? newPacketId(ctx) : 0, ctx->willQoS, ctx->willRetain);
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willPacket.setTopic(ctx->willTopic);
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willPacket.setPayload(ctx->willMessage);
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processPacket(willPacket, client);
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}
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emit q_ptr->clientDisconnected(ctx->clientId);
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clientList.remove(client);
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delete ctx;
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}
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client->flush();
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client->deleteLater();
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}
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void MqttServerPrivate::processPacket(const MqttPacket &packet, QTcpSocket *client)
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{
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if (packet.type() == MqttPacket::TypeConnect) {
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if (clientList.contains(client)) {
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ClientContext *ctx = clientList.value(client);
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qCWarning(dbgServer) << "Client" << ctx->clientId << "sends duplicate CONNECT packets. Dropping connection.";
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cleanupClient(client);
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return;
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}
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MqttPacket response(MqttPacket::TypeConnack, packet.packetId());
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if (packet.protocolLevel() != Mqtt::Protocol311) {
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qCWarning(dbgServer) << "This MQTT broker only supports Protocol version 3.1.1";
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response.setConnectReturnCode(Mqtt::ConnectReturnCodeUnacceptableProtocolVersion);
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client->write(response.serialize());
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cleanupClient(client);
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return;
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}
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QString clientId = packet.clientId();
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if (clientId.isEmpty()) {
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if (!packet.cleanSession()) {
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qCWarning(dbgServer) << "Empty client id provided but clean session flag not set. Rejecting connection.";
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response.setConnectReturnCode(Mqtt::ConnectReturnCodeIdentifierRejected);
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client->write(response.serialize());
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cleanupClient(client);
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return;
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}
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clientId = QUuid::createUuid().toString().remove(QRegExp("[{}-]*"));
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}
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if (userValidator) {
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QString username;
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if (packet.connectFlags().testFlag(Mqtt::ConnectFlagUsername)) {
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username = packet.username();
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}
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QString password;
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if (packet.connectFlags().testFlag(Mqtt::ConnectFlagPassword)) {
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password = packet.password();
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}
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Mqtt::ConnectReturnCode userValidationReturnCode = userValidator->validateConnect(clientId, username, password, client->peerAddress());
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if (userValidationReturnCode != Mqtt::ConnectReturnCodeAccepted) {
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qCWarning(dbgServer) << "Rejecting connection due to user validation.";
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response.setConnectReturnCode(userValidationReturnCode);
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client->write(response.serialize());
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cleanupClient(client);
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return;
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}
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}
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ClientContext *ctx = nullptr;
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QList<QTcpSocket*> existingSockets = clientList.keys();
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for (int i = 0; i < existingSockets.count(); i++) {
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QTcpSocket *existingClient = existingSockets.at(i);
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if (clientId == clientList.value(existingClient)->clientId) {
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if (!packet.connectFlags().testFlag(Mqtt::ConnectFlagCleanSession)) {
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qCDebug(dbgServer).nospace() << clientId << ": Already have a session for this client ID. Taking over existing session.";
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response.setConnackFlags(Mqtt::ConnackFlagSessionPresent);
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ctx = clientList.value(existingClient);
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// remove old client manually, we don't want to clean up the context, nor send any will message or emit disconnected signals
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clientList.remove(existingClient);
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clientBuffers.remove(existingClient);
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existingClient->flush();
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existingClient->deleteLater();
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} else {
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qCDebug(dbgServer).nospace() << clientId << ": Already have a session for this client ID. Dropping old session.";
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cleanupClient(existingClient);
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}
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break;
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}
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}
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if (!ctx) {
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if (!packet.connectFlags().testFlag(Mqtt::ConnectFlagCleanSession)) {
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qCWarning(dbgServer).nospace() << clientId << ": Request to take over existing session but we don't have an existing session.";
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}
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ctx = new ClientContext();
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ctx->clientId = clientId;
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connect(&ctx->keepAliveTimer, &QTimer::timeout, this, [this, client](){
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qCWarning(dbgServer) << "Keep alive timeout reached for client:" << clientList.value(client)->clientId;
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cleanupClient(client);
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});
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}
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ctx->keepAlive = packet.keepAlive();
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ctx->version = packet.protocolLevel();
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if (packet.connectFlags().testFlag(Mqtt::ConnectFlagWill)) {
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ctx->willTopic = packet.willTopic();
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ctx->willMessage = packet.willMessage();
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ctx->willRetain = packet.willRetain();
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if (packet.connectFlags().testFlag(Mqtt::ConnectFlagWillQoS2)) {
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ctx->willQoS = Mqtt::QoS2;
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} else if (packet.connectFlags().testFlag(Mqtt::ConnectFlagWillQoS1)) {
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ctx->willQoS = Mqtt::QoS1;
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}
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}
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if (packet.connectFlags().testFlag(Mqtt::ConnectFlagUsername)) {
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ctx->username = packet.username();
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}
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if (packet.connectFlags().testFlag(Mqtt::ConnectFlagPassword)) {
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}
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qCDebug(dbgServer).nospace().noquote()
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<< "New MQTT client: \"" << clientId << '\"'
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<< ", Protocol: " << packet.protocolName() << " (" << packet.protocolLevel() << ')'
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<< ", Flags: " << packet.connectFlags()
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<< ", KeepAlive: " << packet.keepAlive()
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<< ", Will Topic: \"" << packet.willTopic() << '\"'
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<< ", Will Message: \"" << packet.willMessage() << '\"'
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<< ", Will Retain: " << packet.willRetain()
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<< ", Username: " << packet.username()
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<< ", Password: " << QString(packet.password()).replace(QRegExp("."), "*");
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if (ctx->keepAlive > 0) {
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ctx->keepAliveTimer.start(ctx->keepAlive * 1500);
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}
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clientList.insert(client, ctx);
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response.setConnectReturnCode(Mqtt::ConnectReturnCodeAccepted);
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client->write(response.serialize());
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emit q_ptr->clientConnected(ctx->clientId, ctx->username, client->peerAddress());
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foreach (quint16 retryPacketId, ctx->unackedPacketList) {
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qCDebug(dbgServer) << "Resending unacked packet" << retryPacketId << "to" << ctx->clientId;;
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MqttPacket retryPacket = ctx->unackedPackets.value(retryPacketId);
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retryPacket.setDup(true);
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client->write(retryPacket.serialize());
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}
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return;
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}
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if (!clientList.contains(client)) {
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qCWarning(dbgServer) << "Protocol error: Client connection did not send CONNECT yet. Dropping connection.";
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client->close();
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return;
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}
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ClientContext *ctx = clientList.value(client);
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if (ctx->keepAlive > 0) {
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ctx->keepAliveTimer.start();
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}
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emit q_ptr->clientAlive(ctx->clientId);
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if (packet.type() == MqttPacket::TypePublish) {
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qCDebug(dbgServer).nospace() << "Publish received from client " << ctx->clientId << ": Topic: " << packet.topic() << ", Payload: " << packet.payload() << " (Packet ID: " << packet.packetId() << ", DUP: " << packet.dup() << ", QoS: " << packet.qos() << ", Retain: " << packet.retain() << ')';
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emit q_ptr->publishReceived(ctx->clientId, packet.packetId(), packet.topic(), packet.payload(), packet.dup());
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switch (packet.qos()) {
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case Mqtt::QoS0:
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break;
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case Mqtt::QoS1: {
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MqttPacket response(MqttPacket::TypePuback, packet.packetId());
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client->write(response.serialize());
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break;
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}
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case Mqtt::QoS2: {
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if (packet.dup() && ctx->unackedPacketList.contains(packet.packetId())) {
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// We received this message before but the client keeps on trying... Just send a PUBREC and stop processing
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client->write(ctx->unackedPackets.value(packet.packetId()).serialize());
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return;
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} else if (ctx->unackedPacketList.contains(packet.packetId())) {
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// Hmm... Client says this is a new packet, but the ID is not released yet! Drop client connection.
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qCWarning(dbgServer()).nospace() << "Received a bad packet from \"" << ctx->clientId << "\". DUP is not set but packet ID is already used and not released. Dropping client connection.";
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cleanupClient(client);
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return;
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}
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// Ok, a new packet, ack it with a PUBREC and store the number
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MqttPacket response(MqttPacket::TypePubrec, packet.packetId());
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ctx->unackedPackets.insert(response.packetId(), response);
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ctx->unackedPacketList.append(packet.packetId());
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client->write(response.serialize());
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break;
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}
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}
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if (packet.retain()) {
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if (packet.payload().isEmpty()) {
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qCDebug(dbgServer) << "Clearing retained messages for topic" << packet.topic();
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retainedMessages.remove(packet.topic());
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} else {
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if (packet.qos() == Mqtt::QoS0) {
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qCDebug(dbgServer) << "Clearing retained messages for topic" << packet.topic();
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retainedMessages.remove(packet.topic());
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}
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qCDebug(dbgServer) << "Adding retained message for topic" << packet.topic();
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retainedMessages[packet.topic()].append(packet);
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}
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}
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publish(packet.topic(), packet.payload());
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return;
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}
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if (packet.type() == MqttPacket::TypePuback) {
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ctx->unackedPacketList.removeAll(packet.packetId());
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MqttPacket publishedPacket = ctx->unackedPackets.take(packet.packetId());
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emit q_ptr->published(ctx->clientId, packet.packetId(), publishedPacket.topic(), publishedPacket.payload());
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return;
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}
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if (packet.type() == MqttPacket::TypePubrec) {
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MqttPacket publishedPacket = ctx->unackedPackets.take(packet.packetId());
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emit q_ptr->published(ctx->clientId, packet.packetId(), publishedPacket.topic(), publishedPacket.payload());
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MqttPacket pubrel(MqttPacket::TypePubrel, packet.packetId());
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ctx->unackedPackets.insert(packet.packetId(), pubrel);
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client->write(pubrel.serialize());
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return;
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}
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if (packet.type() == MqttPacket::TypePubrel) {
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ctx->unackedPackets.remove(packet.packetId());
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ctx->unackedPacketList.removeAll(packet.packetId());
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MqttPacket response(MqttPacket::TypePubcomp, packet.packetId());
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client->write(response.serialize());
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return;
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}
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if (packet.type() == MqttPacket::TypePubcomp) {
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ctx->unackedPackets.remove(packet.packetId());
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ctx->unackedPacketList.removeAll(packet.packetId());
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return;
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}
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if (packet.type() == MqttPacket::TypeSubscribe) {
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// qCDebug(dbgServer).nospace() << ctx->clientId ": Subscribe packet received.";
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MqttPacket response(MqttPacket::TypeSuback, packet.packetId());
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QByteArray payload;
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foreach (MqttSubscription subscription, packet.subscriptions()) {
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if (userValidator && !userValidator->validateSubscribe(subscription.topicFilter(), ctx->clientId, ctx->username)) {
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qCWarning(dbgServer).nospace().noquote() << "Subscription topic filter not allowed for client \"" << ctx->clientId << "\": \"" << subscription.topicFilter() << '\"';
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response.addSubscribeReturnCode(Mqtt::SubscribeReturnCodeFailure);
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continue;
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}
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if (!validateTopicFilter(subscription.topicFilter())) {
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qCWarning(dbgServer).nospace() << "Subscription topic filter not valid for client \"" << ctx->clientId << "\": " << subscription.topicFilter();
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response.addSubscribeReturnCode(Mqtt::SubscribeReturnCodeFailure);
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continue;
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}
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subscription.setQoS(qMin(subscription.qoS(), maximumSubscriptionQoS));
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bool updated = false;
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for (int i = 0; i < ctx->subscriptions.count(); i++) {
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if (ctx->subscriptions.at(i).topicFilter() == subscription.topicFilter()) {
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qCDebug(dbgServer).noquote().nospace() << "Client \"" << ctx->clientId << "\" subscribed with a duplicate topic filter. Replacing subcription with new QoS" << subscription.qoS();
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ctx->subscriptions.replace(i, subscription);
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updated = true;
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}
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}
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if (!updated) {
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ctx->subscriptions.append(subscription);
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}
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qCDebug(dbgServer).noquote().nospace() << "Subscribed client \"" << ctx->clientId << "\" to topic filter: \"" << subscription.topicFilter() << "\" with QoS " << subscription.qoS();
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emit q_ptr->clientSubscribed(ctx->clientId, subscription.topicFilter(), subscription.qoS());
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switch (subscription.qoS()) {
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case Mqtt::QoS0:
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response.addSubscribeReturnCode(Mqtt::SubscribeReturnCodeSuccessQoS0);
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break;
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case Mqtt::QoS1:
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response.addSubscribeReturnCode(Mqtt::SubscribeReturnCodeSuccessQoS1);
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break;
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case Mqtt::QoS2:
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response.addSubscribeReturnCode(Mqtt::SubscribeReturnCodeSuccessQoS2);
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|
break;
|
|
}
|
|
}
|
|
client->write(response.serialize());
|
|
|
|
// Deliver any retained messages for this topic
|
|
foreach (MqttSubscription subscription, packet.subscriptions()) {
|
|
foreach (const QString &topic, retainedMessages.keys()) {
|
|
if (matchTopic(subscription.topicFilter(), topic)) {
|
|
foreach (MqttPacket packet, retainedMessages.value(topic)) {
|
|
packet.setRetain(true);
|
|
client->write(packet.serialize());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
if (packet.type() == MqttPacket::TypeUnsubscribe) {
|
|
MqttSubscriptions newSubscriptions;
|
|
foreach (const MqttSubscription &existingSubscription, ctx->subscriptions) {
|
|
bool matching = false;
|
|
foreach (const MqttSubscription &unsub, packet.subscriptions()) {
|
|
if (existingSubscription.topicFilter() == unsub.topicFilter()) {
|
|
qCDebug(dbgServer) << "Unsubscribing client" << ctx->clientId << "from" << unsub.topicFilter();
|
|
emit q_ptr->clientUnsubscribed(ctx->clientId, unsub.topicFilter());
|
|
matching = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!matching) {
|
|
newSubscriptions.append(existingSubscription);
|
|
}
|
|
}
|
|
ctx->subscriptions = newSubscriptions;
|
|
MqttPacket response(MqttPacket::TypeUnsuback, packet.packetId());
|
|
client->write(response.serialize());
|
|
return;
|
|
}
|
|
if (packet.type() == MqttPacket::TypePingreq) {
|
|
// qCDebug(dbgServer).nospace() << ctx->clientId << ": Pingreq received";
|
|
MqttPacket response(MqttPacket::TypePingresp, packet.packetId());
|
|
client->write(response.serialize());
|
|
return;
|
|
}
|
|
if (packet.type() == MqttPacket::TypeDisconnect) {
|
|
ctx->willMessage.clear();
|
|
ctx->willTopic.clear();
|
|
return;
|
|
}
|
|
qCWarning(dbgServer).nospace().noquote() << "Unknown packet received from client \"" << ctx->clientId << "\": " << QString::number(packet.type(), 16);
|
|
Q_ASSERT(false);
|
|
cleanupClient(client);
|
|
|
|
}
|
|
|
|
bool MqttServerPrivate::validateTopicFilter(const QString &topicFilter)
|
|
{
|
|
if (topicFilter.length() < 1) {
|
|
return false;
|
|
}
|
|
QStringList parts = topicFilter.split('/');
|
|
for (int i = 0; i < parts.count(); i++) {
|
|
const QString &part = parts.at(i);
|
|
if (part.contains(QStringLiteral("#")) && (part != QStringLiteral("#") || i != parts.count() - 1)) {
|
|
return false;
|
|
}
|
|
if (part.contains(QStringLiteral("+")) && part != QStringLiteral("+")) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool MqttServerPrivate::matchTopic(const QString &topicFilter, const QString &topic)
|
|
{
|
|
if (topic.startsWith('$')) {
|
|
return false;
|
|
}
|
|
|
|
QStringList filterParts = topicFilter.split('/');
|
|
QStringList topicParts = topic.split('/');
|
|
|
|
if (topicParts.count() < filterParts.count() - 1) {
|
|
return false;
|
|
}
|
|
|
|
for (int i = 0; i < filterParts.count(); i++) {
|
|
if (filterParts.at(i) == QStringLiteral("+")) {
|
|
continue;
|
|
}
|
|
if (filterParts.at(i) == QStringLiteral("#")) {
|
|
continue;
|
|
}
|
|
if (topicParts.at(i) == filterParts.at(i)) {
|
|
continue;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
return filterParts.count() == topicParts.count() || topicFilter.endsWith('#');
|
|
}
|
|
|
|
quint16 MqttServerPrivate::newPacketId(ClientContext *ctx)
|
|
{
|
|
static quint16 packetId = 0;
|
|
do {
|
|
packetId++;
|
|
} while(ctx->unackedPacketList.contains(packetId));
|
|
return packetId;
|
|
}
|
|
|
|
void MqttServerPrivate::onClientReadyRead()
|
|
{
|
|
QTcpSocket* client = static_cast<QTcpSocket*>(sender());
|
|
|
|
clientBuffers[client].append(client->readAll());
|
|
|
|
do {
|
|
MqttPacket packet;
|
|
int ret = packet.parse(clientBuffers[client]);
|
|
if (ret == 0) {
|
|
qCDebug(dbgServer) << "Packet too short... Waiting for more...";
|
|
return;
|
|
}
|
|
|
|
// Ok, we've got a full packet (or garbage data). If this client is still pending
|
|
// we can stop the timer, the protocol will take it from here.
|
|
if (pendingConnections.contains(client)) {
|
|
pendingConnections.take(client)->deleteLater();
|
|
}
|
|
|
|
if (ret == -1) {
|
|
qCWarning(dbgServer) << "Bad MQTT packet data, Dropping connection";
|
|
cleanupClient(client);
|
|
return;
|
|
}
|
|
|
|
clientBuffers[client].remove(0, ret);
|
|
|
|
processPacket(packet, client);
|
|
|
|
} while (!clientBuffers.value(client).isEmpty());
|
|
}
|
|
|
|
void MqttServerPrivate::onClientError(QAbstractSocket::SocketError error)
|
|
{
|
|
// qCWarning(dbgServer) << "Client error:" << error;
|
|
}
|