Connect.cpp

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/*
 * SNode.C - a slim toolkit for network communication
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2020, 2021, 2022, 2023, 2024, 2025
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "iot/mqtt/server/packets/Connect.h"
 
#include "iot/mqtt/server/Mqtt.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "utils/Uuid.h"
 
#include <string>
 
#endif // DOXYGEN_SHOULD_SKIP_THIS
 
namespace iot::mqtt::server::packets {
 
    Connect::Connect(uint32_t remainingLength, uint8_t flags)
        : iot::mqtt::server::ControlPacketDeserializer(remainingLength, flags, MQTT_CONNECT_FLAGS) {
        this->flags = flags;
    }
 
    std::size_t Connect::deserializeVP(iot::mqtt::MqttContext* mqttContext) {
        std::size_t consumed = 0;
 
        switch (state) {
            case 0: // V-Header
                consumed += protocol.deserialize(mqttContext);
                if (!protocol.isComplete()) {
                    break;
                }
 
                state++;
                [[fallthrough]];
            case 1:
                consumed += level.deserialize(mqttContext);
                if (!level.isComplete()) {
                    break;
                }
                reflect = (level & 0x80) == 0; // msb in level == 1 -> do not reflect message to origin (try_private in mosquitto)
                level = level & ~0x80;
 
                state++;
                [[fallthrough]];
            case 2:
                consumed += connectFlags.deserialize(mqttContext);
                if (!connectFlags.isComplete()) {
                    break;
                }
 
                reserved = (connectFlags & 0x01) != 0;
                cleanSession = (connectFlags & 0x02) != 0;
                willFlag = (connectFlags & 0x04) != 0;
                willQoS = (connectFlags & 0x18) >> 3;
                willRetain = (connectFlags & 0x20) != 0;
                passwordFlag = (connectFlags & 0x40) != 0;
                usernameFlag = (connectFlags & 0x80) != 0;
 
                state++;
                [[fallthrough]];
            case 3:
                consumed += keepAlive.deserialize(mqttContext);
                if (!keepAlive.isComplete()) {
                    break;
                }
 
                state++;
                [[fallthrough]];
            case 4: // Payload
                consumed += clientId.deserialize(mqttContext);
                if (!clientId.isComplete()) {
                    break;
                }
 
                if (clientId.size() == 0) {
                    clientId = utils::Uuid::getUuid();
                    fakedClientId = true;
                }
 
                state++;
                [[fallthrough]];
            case 5:
                if (willFlag) {
                    consumed += willTopic.deserialize(mqttContext);
                    if (!willTopic.isComplete()) {
                        break;
                    }
                }
 
                state++;
                [[fallthrough]];
            case 6:
                if (willFlag) {
                    consumed += willMessage.deserialize(mqttContext);
                    if (!willMessage.isComplete()) {
                        break;
                    }
                }
 
                state++;
                [[fallthrough]];
            case 7:
                if (usernameFlag) {
                    consumed += username.deserialize(mqttContext);
                    if (!username.isComplete()) {
                        break;
                    }
                }
 
                state++;
                [[fallthrough]];
            case 8:
                if (passwordFlag) {
                    consumed += password.deserialize(mqttContext);
                    if (!password.isComplete()) {
                        break;
                    }
                }
 
                complete = true;
                break;
        }
 
        return consumed;
    }
 
    void Connect::deliverPacket(iot::mqtt::server::Mqtt* mqtt) {
        mqtt->printVP(*this);
        mqtt->_onConnect(*this);
    }
 
    bool Connect::isFakedClientId() const {
        return fakedClientId;
    }
 
} // namespace iot::mqtt::server::packets