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