mirror of https://github.com/NekoX-Dev/NekoX.git
105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
#ifndef TGCALLS_ENCRYPTED_CONNECTION_H
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#define TGCALLS_ENCRYPTED_CONNECTION_H
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#include "Instance.h"
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#include "Message.h"
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namespace rtc {
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class ByteBufferReader;
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} // namespace rtc
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namespace tgcalls {
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class EncryptedConnection final {
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public:
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enum class Type : uint8_t {
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Signaling,
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Transport,
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};
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EncryptedConnection(
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Type type,
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const EncryptionKey &key,
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std::function<void(int delayMs, int cause)> requestSendService);
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struct EncryptedPacket {
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std::vector<uint8_t> bytes;
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uint32_t counter = 0;
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};
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absl::optional<EncryptedPacket> prepareForSending(const Message &message);
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absl::optional<EncryptedPacket> prepareForSendingRawMessage(rtc::CopyOnWriteBuffer &serialized, bool messageRequiresAck);
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absl::optional<EncryptedPacket> prepareForSendingService(int cause);
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struct DecryptedPacket {
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DecryptedMessage main;
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std::vector<DecryptedMessage> additional;
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};
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struct DecryptedRawPacket {
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DecryptedRawMessage main;
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std::vector<DecryptedRawMessage> additional;
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};
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absl::optional<DecryptedPacket> handleIncomingPacket(const char *bytes, size_t size);
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absl::optional<DecryptedRawPacket> handleIncomingRawPacket(const char *bytes, size_t size);
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absl::optional<rtc::CopyOnWriteBuffer> encryptRawPacket(rtc::CopyOnWriteBuffer const &buffer);
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absl::optional<rtc::CopyOnWriteBuffer> decryptRawPacket(rtc::CopyOnWriteBuffer const &buffer);
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private:
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struct DelayIntervals {
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// In milliseconds.
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int minDelayBeforeMessageResend = 0;
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int maxDelayBeforeMessageResend = 0;
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int maxDelayBeforeAckResend = 0;
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};
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struct MessageForResend {
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rtc::CopyOnWriteBuffer data;
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int64_t lastSent = 0;
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};
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bool enoughSpaceInPacket(const rtc::CopyOnWriteBuffer &buffer, size_t amount) const;
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size_t packetLimit() const;
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size_t fullNotAckedLength() const;
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void appendAcksToSend(rtc::CopyOnWriteBuffer &buffer);
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void appendAdditionalMessages(rtc::CopyOnWriteBuffer &buffer);
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EncryptedPacket encryptPrepared(const rtc::CopyOnWriteBuffer &buffer);
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bool registerIncomingCounter(uint32_t incomingCounter);
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absl::optional<DecryptedPacket> processPacket(const rtc::Buffer &fullBuffer, uint32_t packetSeq);
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absl::optional<DecryptedRawPacket> processRawPacket(const rtc::Buffer &fullBuffer, uint32_t packetSeq);
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bool registerSentAck(uint32_t counter, bool firstInPacket);
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void ackMyMessage(uint32_t counter);
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void sendAckPostponed(uint32_t incomingSeq);
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bool haveAdditionalMessages() const;
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absl::optional<uint32_t> computeNextSeq(bool messageRequiresAck, bool singleMessagePacket);
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void appendReceivedMessage(
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absl::optional<DecryptedPacket> &to,
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Message &&message,
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uint32_t incomingSeq);
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void appendReceivedRawMessage(
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absl::optional<DecryptedRawPacket> &to,
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rtc::CopyOnWriteBuffer &&message,
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uint32_t incomingSeq);
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absl::optional<EncryptedPacket> prepareForSendingMessageInternal(rtc::CopyOnWriteBuffer &serialized, uint32_t seq, bool messageRequiresAck);
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const char *logHeader() const;
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static DelayIntervals DelayIntervalsByType(Type type);
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static rtc::CopyOnWriteBuffer SerializeEmptyMessageWithSeq(uint32_t seq);
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Type _type = Type();
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EncryptionKey _key;
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uint32_t _counter = 0;
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DelayIntervals _delayIntervals;
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std::vector<uint32_t> _largestIncomingCounters;
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std::vector<uint32_t> _ackedIncomingCounters;
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std::vector<uint32_t> _acksToSendSeqs;
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std::vector<uint32_t> _acksSentCounters;
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std::vector<MessageForResend> _myNotYetAckedMessages;
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std::function<void(int delayMs, int cause)> _requestSendService;
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bool _resendTimerActive = false;
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bool _sendAcksTimerActive = false;
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};
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} // namespace tgcalls
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#endif
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