author | František Kučera <franta-hg@frantovo.cz> |
Mon, 04 Jan 2021 17:11:57 +0100 | |
branch | v_0 |
changeset 13 | 334b727f7516 |
parent 12 | 15d87fdd6e6c |
permissions | -rw-r--r-- |
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/** |
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* DJM-Fix |
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* Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program 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 3 of the License. |
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* |
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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#include <iostream> |
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#include <sstream> |
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#include <iomanip> |
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#include <thread> |
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#include <mutex> |
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#include <atomic> |
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#include <chrono> |
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#include <stdexcept> |
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#include <vector> |
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#include "DJMFix.h" |
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namespace djmfix { |
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using L = djmfix::logging::Level; |
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using Bytes = std::vector<uint8_t>; |
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class DJMFixImpl : public DJMFix { |
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private: |
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MidiSender* midiSender; |
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djmfix::logging::Logger* logger; |
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const int keepAliveInterval = 200; |
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int keepAliveCounter = 0; |
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std::thread keepAliveThread; |
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std::recursive_mutex midiMutex; |
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std::atomic<bool> running{false}; |
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std::atomic<bool> stopped{false}; |
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std::atomic<bool> sendKeepAlive{false}; |
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Bytes seed2; |
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void run() { |
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while (!stopped) { |
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logger->log(L::FINE, "DJMFixImpl::run()"); |
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if (sendKeepAlive) send({0xf0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x00, 0x17, 0x00, 0x50, 0x01, 0xf7}); |
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std::this_thread::sleep_for(std::chrono::milliseconds(keepAliveInterval)); |
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keepAliveCounter++; |
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if (keepAliveCounter % (60 * 1000 / keepAliveInterval) == 0) logger->log(L::INFO, "Still sending periodic keep-alive messages (each " + std::to_string(keepAliveInterval) + " ms)."); |
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} |
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} |
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void send(const MidiMessage& midiMessage) { |
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std::lock_guard<std::recursive_mutex> lock(midiMutex); |
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midiSender->send(midiMessage); |
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} |
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std::string toString(const Bytes& midiMessage) { |
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std::stringstream result; |
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for (uint8_t b : midiMessage) result << std::hex << std::setw(2) << std::setfill('0') << (int) b; |
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return result.str(); |
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} |
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Bytes normalize(const Bytes& data) { |
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if (data.size() % 2) throw std::invalid_argument("Data before normalization must have even number of bytes."); |
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Bytes result; |
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result.reserve(data.size() / 2); |
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for (size_t i = 0; i < data.size() / 2; i++) result.push_back((data[i * 2] & 0x0F) << 4 | (data[i * 2 + 1] & 0x0F)); |
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return result; |
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} |
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Bytes denormalize(const Bytes& data) { |
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Bytes result; |
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result.reserve(data.size()*2); |
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for (size_t i = 0; i < data.size(); i++) { |
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result.push_back(data[i] >> 4); |
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result.push_back(data[i] & 0x0F); |
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} |
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return result; |
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} |
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uint32_t fnv32hash(const Bytes& buff) { |
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uint32_t hash = 0x811c9dc5; |
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for (uint8_t b : buff) hash = ((b^hash) * 0x1000193); |
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return hash; |
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} |
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Bytes toBytes(const uint32_t value) { |
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Bytes result; |
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result.reserve(4); |
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result.push_back(value >> 24); |
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result.push_back(value >> 16); |
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result.push_back(value >> 8); |
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result.push_back(value >> 0); |
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return result; |
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} |
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bool equals(Bytes a, Bytes b) { |
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if (a.size() != b.size()) return false; |
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for (size_t i = 0; i < a.size(); i++) if (a[i] != b[i]) return false; |
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return true; |
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} |
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template<typename T> std::vector<T> concat(const std::vector<T>& a, const std::vector<T>& b, const std::vector<T>& c = {}) { |
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std::vector<T> result; |
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result.reserve(a.size() + b.size() + c.size()); |
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for (size_t i = 0; i < a.size(); i++) result.push_back(a[i]); |
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for (size_t i = 0; i < b.size(); i++) result.push_back(b[i]); |
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for (size_t i = 0; i < c.size(); i++) result.push_back(c[i]); |
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return result; |
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} |
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template<typename T> std::vector<T> xOR(const std::vector<T>& a, const std::vector<T>& b) { |
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if (a.size() != b.size()) throw std::invalid_argument("Both must be the same length when doing XOR."); |
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std::vector<T> result; |
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result.reserve(a.size()); |
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for (size_t i = 0; i < a.size(); i++) result.push_back(a[i] ^ b[i]); |
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return result; |
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} |
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public: |
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DJMFixImpl(djmfix::logging::Logger* logger) : logger(logger ? logger : djmfix::logging::blackhole()) { |
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} |
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129 |
|
1 | 130 |
virtual ~DJMFixImpl() override { |
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logger->log(L::FINER, "~DJMFixImpl()"); |
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if (running) stop(); |
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} |
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134 |
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void setMidiSender(MidiSender* midiSender) { |
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logger->log(L::FINER, "DJMFixImpl::setMidiSender()"); |
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this->midiSender = midiSender; |
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} |
139 |
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virtual void receive(const MidiMessage& midiMessage) override { |
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logger->log(L::FINE, "Received a message: size = " + std::to_string(midiMessage.size()) + " data = " + toString(midiMessage)); |
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std::lock_guard<std::recursive_mutex> lock(midiMutex); |
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143 |
|
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144 |
|
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if (midiMessage.size() == 12 && midiMessage[9] == 0x11) { |
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logger->log(L::INFO, "Received greeting message."); |
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send({0xf0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x00, 0x17, 0x00, 0x12, 0x2a, 0x01, 0x0b, 0x50, 0x69, 0x6f, 0x6e, 0x65, 0x65, 0x72, 0x44, 0x4a, 0x02, 0x0b, 0x72, 0x65, 0x6b, 0x6f, 0x72, 0x64, 0x62, 0x6f, 0x78, 0x03, 0x12, 0x02, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x04, 0x08, 0x00, 0x00, 0x00, 0x00, 0xf7}); |
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logger->log(L::INFO, "Sent message with seed1."); |
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} else if (midiMessage.size() == 54 && midiMessage[9] == 0x13 && midiMessage[33] == 0x04 && midiMessage[43] == 0x03) { |
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Bytes hash1(midiMessage.begin() + 35, midiMessage.begin() + 35 + 8); |
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seed2 = Bytes(midiMessage.begin() + 45, midiMessage.begin() + 45 + 8); |
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hash1 = normalize(hash1); |
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seed2 = normalize(seed2); |
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logger->log(L::INFO, "Received message with hash1 = " + toString(hash1) + " and seed2 = " + toString(seed2)); |
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|
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Bytes seed0 = {0x68, 0x01, 0x31, 0xFB}; |
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Bytes seed1 = {0x29, 0x00, 0x00, 0x00, 0x23, 0x48, 0x00, 0x00}; |
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158 |
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Bytes hash1check = toBytes(fnv32hash(concat(seed1, xOR(seed0, seed2)))); |
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|
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if (equals(hash1, hash1check)) { |
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logger->log(L::INFO, "Verification of hash1 was successful."); |
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Bytes hash2 = toBytes(fnv32hash(concat(seed2, xOR(seed0, seed2)))); |
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send(concat({0xf0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x00, 0x17, 0x00, 0x14, 0x38, 0x01, 0x0b, 0x50, 0x69, 0x6f, 0x6e, 0x65, 0x65, 0x72, 0x44, 0x4a, 0x02, 0x0b, 0x72, 0x65, 0x6b, 0x6f, 0x72, 0x64, 0x62, 0x6f, 0x78, 0x04, 0x0a}, concat(denormalize(hash2),{0x05, 0x16, 0x05, 0x09, 0x0b, 0x05, 0x04, 0x0b, 0x0f, 0x0e, 0x0e, 0x04, 0x04, 0x0a, 0x05, 0x0a, 0x0c, 0x08, 0x0e, 0x04, 0x0c, 0x05, 0xf7}))); |
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logger->log(L::INFO, "Sent message with hash2."); |
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} else { |
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std::stringstream logMessage; |
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logMessage |
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<< "Verification of hash1 failed: " |
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<< " midiMessage = " << toString(midiMessage) |
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<< " seed0 = " << toString(seed0) |
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<< " seed1 = " << toString(seed1) |
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<< " seed2 = " << toString(seed2) |
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<< " hash1 = " << toString(hash1) |
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<< " hash1check = " << toString(hash1check); |
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logger->log(L::SEVERE, logMessage.str()); |
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// TODO: graceful death |
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178 |
} |
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} else if (midiMessage.size() == 12 && midiMessage[9] == 0x15) { |
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sendKeepAlive = true; |
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logger->log(L::INFO, "Received acknowledgment message. Started sending keep-alive messages. LINE/PHONO channels should work now."); |
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} |
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183 |
|
1 | 184 |
} |
185 |
||
186 |
void start() override { |
|
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logger->log(L::FINE, "DJMFixImpl::start()"); |
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if (midiSender == nullptr) throw std::logic_error("Need a midiSender when starting DJMFix"); |
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189 |
|
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// TODO: methods for parsing and constructing messages from parts (TLV) |
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191 |
send({0xf0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x00, 0x17, 0x00, 0x50, 0x01, 0xf7}); |
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192 |
logger->log(L::INFO, "Sent greeting message."); |
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193 |
|
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keepAliveThread = std::thread(&DJMFixImpl::run, this); |
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195 |
running = true; |
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196 |
|
1 | 197 |
} |
198 |
||
199 |
void stop() override { |
|
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200 |
stopped = true; |
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201 |
keepAliveThread.join(); |
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202 |
running = false; |
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203 |
logger->log(L::FINE, "DJMFixImpl::stop()"); |
1 | 204 |
} |
205 |
}; |
|
206 |
||
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207 |
DJMFix* create(djmfix::logging::Logger* logger) { |
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208 |
return new DJMFixImpl(logger); |
1 | 209 |
} |
210 |
||
211 |
} |