Protocol Constants

Core protocol version and configuration constants. More...

Variables
static const int16_t	kProtocolMajorVersion = 1
	Protocol major version number.
static const int16_t	kProtocolMinorVersion = 8
	Protocol minor version number.
static const uint16_t	kDefaultPort = 24800
	Default TCP port for Deskflow connections.
static const uint32_t	kMaxHelloLength = 1024
	Maximum length for client greeting message.
static const double	kKeepAliveRate = 3.0
	Keep-alive message interval in seconds.
static const double	kKeepAlivesUntilDeath = 3.0
	Keep-alive timeout threshold.
static const double	kHeartRate = -1.0
	Obsolete heartbeat rate (deprecated).
static const double	kHeartBeatsUntilDeath = 3.0
	Obsolete heartbeat timeout (deprecated).
static constexpr uint32_t	PROTOCOL_MAX_MESSAGE_LENGTH = 4 * 1024 * 1024
	Maximum allowed message length.
static constexpr uint32_t	PROTOCOL_MAX_LIST_LENGTH = 1024 * 1024
	Maximum allowed list length in protocol messages.
static constexpr uint32_t	PROTOCOL_MAX_STRING_LENGTH = 1024 * 1024
	Maximum allowed string length in protocol messages.

Detailed Description

Core protocol version and configuration constants.

Variable Documentation

kDefaultPort

const uint16_t kDefaultPort = 24800

static

Default TCP port for Deskflow connections.

Clients connect to this port on the server by default. Can be overridden in configuration.

Since

Protocol version 1.0

kHeartBeatsUntilDeath

const double kHeartBeatsUntilDeath = 3.0

static

Obsolete heartbeat timeout (deprecated).

Deprecated

Since protocol version 1.3, replaced by keep-alive mechanism

See also

kKeepAlivesUntilDeath

kHeartRate

const double kHeartRate = -1.0

static

Obsolete heartbeat rate (deprecated).

Deprecated

Since protocol version 1.3, replaced by keep-alive mechanism

See also

kKeepAliveRate

kKeepAliveRate

const double kKeepAliveRate = 3.0

static

Keep-alive message interval in seconds.

Time between kMsgCKeepAlive messages sent by the server. A non-positive value disables keep-alives. This is the default rate that can be overridden using options.

See also

kMsgCKeepAlive

Since

Protocol version 1.3

kKeepAlivesUntilDeath

const double kKeepAlivesUntilDeath = 3.0

static

Keep-alive timeout threshold.

Number of consecutive missed kMsgCKeepAlive messages that indicates a connection problem. After this many missed messages, the connection is considered dead and will be terminated.

See also

kMsgCKeepAlive

Since

Protocol version 1.3

kMaxHelloLength

const uint32_t kMaxHelloLength = 1024

static

Maximum length for client greeting message.

Limits the size of the hello message sent by clients during handshake. Prevents memory exhaustion attacks during connection establishment.

Since

Protocol version 1.0

kProtocolMajorVersion

const int16_t kProtocolMajorVersion = 1

static

Protocol major version number.

The major version indicates fundamental protocol compatibility. Clients and servers with different major versions cannot communicate.

Since

Protocol version 1.0

kProtocolMinorVersion

const int16_t kProtocolMinorVersion = 8

static

Protocol minor version number.

The minor version indicates feature availability within the same major version. Higher minor versions are backward compatible with lower minor versions.

Note

When incrementing the minor version, the Deskflow application version should also increment

Since

Protocol version 1.0

PROTOCOL_MAX_LIST_LENGTH

uint32_t PROTOCOL_MAX_LIST_LENGTH = 1024 * 1024

staticconstexpr

Maximum allowed list length in protocol messages.

Limits the size of lists (arrays) in protocol messages to prevent memory exhaustion attacks.

Since

Protocol version 1.0

PROTOCOL_MAX_MESSAGE_LENGTH

uint32_t PROTOCOL_MAX_MESSAGE_LENGTH = 4 * 1024 * 1024

staticconstexpr

Maximum allowed message length.

Messages exceeding this size indicate a likely protocol error. Such messages are not parsed and cause connection termination. This prevents memory exhaustion attacks.

Note

Clipboard messages are separately limited to 32KB chunks

Since

Protocol version 1.0

PROTOCOL_MAX_STRING_LENGTH

uint32_t PROTOCOL_MAX_STRING_LENGTH = 1024 * 1024

staticconstexpr

Maximum allowed string length in protocol messages.

Limits the size of strings in protocol messages to prevent memory exhaustion attacks.

Since

Protocol version 1.0