#include <net.h>

Inheritance diagram for V2Transport:

Collaboration diagram for V2Transport:

Public Member Functions
	V2Transport (NodeId nodeid, bool initiating) noexcept
	Construct a V2 transport with securely generated random keys. More...

	V2Transport (NodeId nodeid, bool initiating, const CKey &key, std::span< const std::byte > ent32, std::vector< uint8_t > garbage) noexcept
	Construct a V2 transport with specified keys and garbage (test use only). More...

bool	ReceivedMessageComplete () const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex)
	Returns true if the current message is complete (so GetReceivedMessage can be called). More...

bool	ReceivedBytes (std::span< const uint8_t > &msg_bytes) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex
	Feed wire bytes to the transport. More...

CNetMessage	GetReceivedMessage (std::chrono::microseconds time, bool &reject_message) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex)
	Retrieve a completed message from transport. More...

bool	SetMessageToSend (CSerializedNetMsg &msg) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex)
	Set the next message to send. More...

BytesToSend	GetBytesToSend (bool have_next_message) const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex)
	Get bytes to send on the wire, if any, along with other information about it. More...

void	MarkBytesSent (size_t bytes_sent) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex)
	Report how many bytes returned by the last GetBytesToSend() have been sent. More...

size_t	GetSendMemoryUsage () const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex)
	Return the memory usage of this transport attributable to buffered data to send. More...

bool	ShouldReconnectV1 () const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex
	Whether upon disconnections, a reconnect with V1 is warranted. More...

Info	GetInfo () const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex)
	Retrieve information about this transport. More...

Public Member Functions inherited from Transport
virtual	~Transport ()=default

virtual Info	GetInfo () const noexcept=0
	Retrieve information about this transport. More...

virtual bool	ReceivedMessageComplete () const =0
	Returns true if the current message is complete (so GetReceivedMessage can be called). More...

virtual bool	ReceivedBytes (std::span< const uint8_t > &msg_bytes)=0
	Feed wire bytes to the transport. More...

virtual CNetMessage	GetReceivedMessage (std::chrono::microseconds time, bool &reject_message)=0
	Retrieve a completed message from transport. More...

virtual bool	SetMessageToSend (CSerializedNetMsg &msg) noexcept=0
	Set the next message to send. More...

virtual BytesToSend	GetBytesToSend (bool have_next_message) const noexcept=0
	Get bytes to send on the wire, if any, along with other information about it. More...

virtual void	MarkBytesSent (size_t bytes_sent) noexcept=0
	Report how many bytes returned by the last GetBytesToSend() have been sent. More...

virtual size_t	GetSendMemoryUsage () const noexcept=0
	Return the memory usage of this transport attributable to buffered data to send. More...

virtual bool	ShouldReconnectV1 () const noexcept=0
	Whether upon disconnections, a reconnect with V1 is warranted. More...

Static Public Attributes
static constexpr uint32_t	MAX_GARBAGE_LEN = 4095

Private Types
enum class	RecvState : uint8_t { KEY_MAYBE_V1 , KEY , GARB_GARBTERM , VERSION , APP , APP_READY , V1 }
	State type that defines the current contents of the receive buffer and/or how the next received bytes added to it will be interpreted. More...

enum class	SendState : uint8_t { MAYBE_V1 , AWAITING_KEY , READY , V1 }
	State type that controls the sender side. More...

Private Member Functions
Mutex m_recv_mutex	ACQUIRED_BEFORE (m_send_mutex)
	Lock for receiver-side fields. More...

uint32_t m_recv_len	GUARDED_BY (m_recv_mutex)
	In {VERSION, APP}, the decrypted packet length, if m_recv_buffer.size() >= BIP324Cipher::LENGTH_LEN. More...

std::vector< uint8_t > m_recv_buffer	GUARDED_BY (m_recv_mutex)
	Receive buffer; meaning is determined by m_recv_state. More...

std::vector< uint8_t > m_recv_aad	GUARDED_BY (m_recv_mutex)
	AAD expected in next received packet (currently used only for garbage). More...

std::vector< uint8_t > m_recv_decode_buffer	GUARDED_BY (m_recv_mutex)
	Buffer to put decrypted contents in, for converting to CNetMessage. More...

RecvState m_recv_state	GUARDED_BY (m_recv_mutex)
	Current receiver state. More...

Mutex m_send_mutex	ACQUIRED_AFTER (m_recv_mutex)
	Lock for sending-side fields. More...

std::vector< uint8_t > m_send_buffer	GUARDED_BY (m_send_mutex)
	The send buffer; meaning is determined by m_send_state. More...

uint32_t m_send_pos	GUARDED_BY (m_send_mutex)
	How many bytes from the send buffer have been sent so far. More...

std::vector< uint8_t > m_send_garbage	GUARDED_BY (m_send_mutex)
	The garbage sent, or to be sent (MAYBE_V1 and AWAITING_KEY state only). More...

std::string m_send_type	GUARDED_BY (m_send_mutex)
	Type of the message being sent. More...

SendState m_send_state	GUARDED_BY (m_send_mutex)
	Current sender state. More...

bool m_sent_v1_header_worth	GUARDED_BY (m_send_mutex)
	Whether we've sent at least 24 bytes (which would trigger disconnect for V1 peers). More...

void	SetReceiveState (RecvState recv_state) noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex)
	Change the receive state. More...

void	SetSendState (SendState send_state) noexcept EXCLUSIVE_LOCKS_REQUIRED(m_send_mutex)
	Change the send state. More...

size_t	GetMaxBytesToProcess () noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex)
	Determine how many received bytes can be processed in one go (not allowed in V1 state). More...

void	StartSendingHandshake () noexcept EXCLUSIVE_LOCKS_REQUIRED(m_send_mutex)
	Put our public key + garbage in the send buffer. More...

void	ProcessReceivedMaybeV1Bytes () noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex
	Process bytes in m_recv_buffer, while in KEY_MAYBE_V1 state. More...

bool	ProcessReceivedKeyBytes () noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex
	Process bytes in m_recv_buffer, while in KEY state. More...

bool	ProcessReceivedGarbageBytes () noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex)
	Process bytes in m_recv_buffer, while in GARB_GARBTERM state. More...

bool	ProcessReceivedPacketBytes () noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex)
	Process bytes in m_recv_buffer, while in VERSION/APP state. More...

Static Private Member Functions
static std::optional< std::string >	GetMessageType (std::span< const uint8_t > &contents) noexcept
	Given a packet's contents, find the message type (if valid), and strip it from contents. More...

Private Attributes
BIP324Cipher	m_cipher
	Cipher state. More...

const bool	m_initiating
	Whether we are the initiator side. More...

const NodeId	m_nodeid
	NodeId (for debug logging). More...

V1Transport	m_v1_fallback
	Encapsulate a V1Transport to fall back to. More...

void	!m_send_mutex

bool	!m_send_mutex

Static Private Attributes
static constexpr std::array< std::byte, 0 >	VERSION_CONTENTS = {}
	Contents of the version packet to send. More...

static constexpr size_t	V1_PREFIX_LEN = 16
	The length of the V1 prefix to match bytes initially received by responders with to determine if their peer is speaking V1 or V2. More...

Additional Inherited Members
Public Types inherited from Transport
using	BytesToSend = std::tuple< std::span< const uint8_t >, bool, const std::string & >
	Return type for GetBytesToSend, consisting of: More...

Detailed Description

Definition at line 449 of file net.h.

Member Enumeration Documentation

◆ RecvState

enum class V2Transport::RecvState : uint8_t

strongprivate

State type that defines the current contents of the receive buffer and/or how the next received bytes added to it will be interpreted.

Diagram:

start(responder) | | start(initiator) /------—\ | | | | v v v | KEY_MAYBE_V1 -> KEY -> GARB_GARBTERM -> VERSION -> APP -> APP_READY | ----—> V1

Enumerator
KEY_MAYBE_V1	(Responder only) either v2 public key or v1 header. This is the initial state for responders, before data has been received to distinguish v1 from v2 connections. When that happens, the state becomes either KEY (for v2) or V1 (for v1).
KEY	Public key. This is the initial state for initiators, during which the other side's public key is received. When that information arrives, the ciphers get initialized and the state becomes GARB_GARBTERM.
GARB_GARBTERM	Garbage and garbage terminator. Whenever a byte is received, the last 16 bytes are compared with the expected garbage terminator. When that happens, the state becomes VERSION. If no matching terminator is received in 4111 bytes (4095 for the maximum garbage length, and 16 bytes for the terminator), the connection aborts.
VERSION	Version packet. A packet is received, and decrypted/verified. If that fails, the connection aborts. The first received packet in this state (whether it's a decoy or not) is expected to authenticate the garbage received during the GARB_GARBTERM state as associated authenticated data (AAD). The first non-decoy packet in this state is interpreted as version negotiation (currently, that means ignoring the contents, but it can be used for negotiating future extensions), and afterwards the state becomes APP.
APP	Application packet. A packet is received, and decrypted/verified. If that succeeds, the state becomes APP_READY and the decrypted contents is kept in m_recv_decode_buffer until it is retrieved as a message by GetMessage().
APP_READY	Nothing (an application packet is available for GetMessage()). Nothing can be received in this state. When the message is retrieved by GetMessage, the state becomes APP again.
V1	Nothing (this transport is using v1 fallback). All receive operations are redirected to m_v1_fallback.

Definition at line 480 of file net.h.

◆ SendState

enum class V2Transport::SendState : uint8_t

strongprivate

State type that controls the sender side.

Diagram:

start(responder) | | start(initiator) | | v v MAYBE_V1 -> AWAITING_KEY -> READY | -----> V1

Enumerator
MAYBE_V1	(Responder only) Not sending until v1 or v2 is detected. This is the initial state for responders. The send buffer is empty. When the receiver determines whether this is a V1 or V2 connection, the sender state becomes AWAITING_KEY (for v2) or V1 (for v1).
AWAITING_KEY	Waiting for the other side's public key. This is the initial state for initiators. The public key and garbage is sent out. When the receiver receives the other side's public key and transitions to GARB_GARBTERM, the sender state becomes READY.
READY	Normal sending state. In this state, the ciphers are initialized, so packets can be sent. When this state is entered, the garbage terminator and version packet are appended to the send buffer (in addition to the key and garbage which may still be there). In this state a message can be provided if the send buffer is empty.
V1	This transport is using v1 fallback. All send operations are redirected to m_v1_fallback.

Definition at line 545 of file net.h.

Constructor & Destructor Documentation

◆ V2Transport() [1/2]

V2Transport::V2Transport	(	NodeId	nodeid,
		bool	initiating
	)

noexcept

Construct a V2 transport with securely generated random keys.

Parameters

[in]	nodeid	the node's NodeId (only for debug log output).
[in]	initiating	whether we are the initiator side.

Definition at line 1013 of file net.cpp.

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◆ V2Transport() [2/2]

V2Transport::V2Transport	(	NodeId	nodeid,
		bool	initiating,
		const CKey &	key,
		std::span< const std::byte >	ent32,
		std::vector< uint8_t >	garbage
	)

noexcept

Construct a V2 transport with specified keys and garbage (test use only).

Definition at line 998 of file net.cpp.

Member Function Documentation

◆ ACQUIRED_AFTER()

Mutex m_send_mutex V2Transport::ACQUIRED_AFTER ( m_recv_mutex )

mutableprivate

Lock for sending-side fields.

If both sending and receiving fields are accessed, m_recv_mutex must be acquired before m_send_mutex.

◆ ACQUIRED_BEFORE()

Mutex m_recv_mutex V2Transport::ACQUIRED_BEFORE ( m_send_mutex )

mutableprivate

Lock for receiver-side fields.

◆ GetBytesToSend()

Transport::BytesToSend V2Transport::GetBytesToSend ( bool have_next_message ) const

overridevirtualnoexcept

Get bytes to send on the wire, if any, along with other information about it.

As a const function, it does not modify the transport's observable state, and is thus safe to be called multiple times.

Parameters

[in] have_next_message If true, the "more" return value reports whether more will be sendable after a SetMessageToSend call. It is set by the caller when they know they have another message ready to send, and only care about what happens after that. The have_next_message argument only affects this "more" return value and nothing else.

Effectively, there are three possible outcomes about whether there are more bytes to send:

Yes: the transport itself has more bytes to send later. For example, for V1Transport this happens during the sending of the header of a message, when there is a non-empty payload that follows.
No: the transport itself has no more bytes to send, but will have bytes to send if handed a message through SetMessageToSend. In V1Transport this happens when sending the payload of a message.
Blocked: the transport itself has no more bytes to send, and is also incapable of sending anything more at all now, if it were handed another message to send. This occurs in V2Transport before the handshake is complete, as the encryption ciphers are not set up for sending messages before that point.

The boolean 'more' is true for Yes, false for Blocked, and have_next_message controls what is returned for No.

Returns: a BytesToSend object. The to_send member returned acts as a stream which is only ever appended to. This means that with the exception of MarkBytesSent (which pops bytes off the front of later to_sends), operations on the transport can only append to what is being returned. Also note that m_type and to_send refer to data that is internal to the transport, and calling any non-const function on this object may invalidate them.

Implements Transport.

Definition at line 1511 of file net.cpp.

◆ GetInfo()

Transport::Info V2Transport::GetInfo ( ) const

overridevirtualnoexcept

Retrieve information about this transport.

Implements Transport.

Definition at line 1576 of file net.cpp.

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◆ GetMaxBytesToProcess()

size_t V2Transport::GetMaxBytesToProcess ( )

privatenoexcept

Determine how many received bytes can be processed in one go (not allowed in V1 state).

Definition at line 1271 of file net.cpp.

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◆ GetMessageType()

std::optional< std::string > V2Transport::GetMessageType ( std::span< const uint8_t > & contents )

staticprivatenoexcept

Given a packet's contents, find the message type (if valid), and strip it from contents.

Definition at line 1410 of file net.cpp.

◆ GetReceivedMessage()

CNetMessage V2Transport::GetReceivedMessage	(	std::chrono::microseconds	time,
		bool &	reject_message
	)

overridevirtualnoexcept

Retrieve a completed message from transport.

This can only be called when ReceivedMessageComplete() is true.

If reject_message=true is returned the message itself is invalid, but (other than false returned by ReceivedBytes) the transport is not in an inconsistent state.

Implements Transport.

Definition at line 1450 of file net.cpp.

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◆ GetSendMemoryUsage()

size_t V2Transport::GetSendMemoryUsage ( ) const

overridevirtualnoexcept

Return the memory usage of this transport attributable to buffered data to send.

Implements Transport.

Definition at line 1567 of file net.cpp.

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◆ GUARDED_BY() [1/11]

uint32_t m_recv_len V2Transport::GUARDED_BY ( m_recv_mutex )

inlineprivate

In {VERSION, APP}, the decrypted packet length, if m_recv_buffer.size() >= BIP324Cipher::LENGTH_LEN.

Unspecified otherwise.

Definition at line 588 of file net.h.

◆ GUARDED_BY() [2/11]

std::vector< uint8_t > m_recv_buffer V2Transport::GUARDED_BY ( m_recv_mutex )

private

Receive buffer; meaning is determined by m_recv_state.

◆ GUARDED_BY() [3/11]

std::vector< uint8_t > m_recv_aad V2Transport::GUARDED_BY ( m_recv_mutex )

private

AAD expected in next received packet (currently used only for garbage).

◆ GUARDED_BY() [4/11]

std::vector< uint8_t > m_recv_decode_buffer V2Transport::GUARDED_BY ( m_recv_mutex )

private

Buffer to put decrypted contents in, for converting to CNetMessage.

◆ GUARDED_BY() [5/11]

RecvState m_recv_state V2Transport::GUARDED_BY ( m_recv_mutex )

private

Current receiver state.

◆ GUARDED_BY() [6/11]

std::vector< uint8_t > m_send_buffer V2Transport::GUARDED_BY ( m_send_mutex )

private

The send buffer; meaning is determined by m_send_state.

◆ GUARDED_BY() [7/11]

uint32_t m_send_pos V2Transport::GUARDED_BY ( m_send_mutex )

inlineprivate

How many bytes from the send buffer have been sent so far.

Definition at line 604 of file net.h.

◆ GUARDED_BY() [8/11]

std::vector< uint8_t > m_send_garbage V2Transport::GUARDED_BY ( m_send_mutex )

private

The garbage sent, or to be sent (MAYBE_V1 and AWAITING_KEY state only).

◆ GUARDED_BY() [9/11]

std::string m_send_type V2Transport::GUARDED_BY ( m_send_mutex )

private

Type of the message being sent.

◆ GUARDED_BY() [10/11]

SendState m_send_state V2Transport::GUARDED_BY ( m_send_mutex )

private

Current sender state.

◆ GUARDED_BY() [11/11]

bool m_sent_v1_header_worth V2Transport::GUARDED_BY ( m_send_mutex )

inlineprivate

Whether we've sent at least 24 bytes (which would trigger disconnect for V1 peers).

Definition at line 612 of file net.h.

◆ MarkBytesSent()

void V2Transport::MarkBytesSent ( size_t bytes_sent )

overridevirtualnoexcept

Report how many bytes returned by the last GetBytesToSend() have been sent.

bytes_sent cannot exceed to_send.size() of the last GetBytesToSend() result.

If bytes_sent=0, this call has no effect.

Implements Transport.

Definition at line 1528 of file net.cpp.

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◆ ProcessReceivedGarbageBytes()

bool V2Transport::ProcessReceivedGarbageBytes ( )

privatenoexcept

Process bytes in m_recv_buffer, while in GARB_GARBTERM state.

Definition at line 1175 of file net.cpp.

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◆ ProcessReceivedKeyBytes()

bool V2Transport::ProcessReceivedKeyBytes ( )

privatenoexcept

Process bytes in m_recv_buffer, while in KEY state.

Definition at line 1115 of file net.cpp.

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◆ ProcessReceivedMaybeV1Bytes()

void V2Transport::ProcessReceivedMaybeV1Bytes ( )

privatenoexcept

Process bytes in m_recv_buffer, while in KEY_MAYBE_V1 state.

Definition at line 1077 of file net.cpp.

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◆ ProcessReceivedPacketBytes()

bool V2Transport::ProcessReceivedPacketBytes ( )

privatenoexcept

Process bytes in m_recv_buffer, while in VERSION/APP state.

Definition at line 1202 of file net.cpp.

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◆ ReceivedBytes()

bool V2Transport::ReceivedBytes ( std::span< const uint8_t > & msg_bytes )

overridevirtualnoexcept

Feed wire bytes to the transport.

Returns: false if some bytes were invalid, in which case the transport can't be used anymore.

Consumed bytes are chopped off the front of msg_bytes.

How many bytes to allocate in the receive buffer at most above what is received so far.

Implements Transport.

Definition at line 1320 of file net.cpp.

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◆ ReceivedMessageComplete()

bool V2Transport::ReceivedMessageComplete ( ) const

overridevirtualnoexcept

Returns true if the current message is complete (so GetReceivedMessage can be called).

Implements Transport.

Definition at line 1068 of file net.cpp.

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◆ SetMessageToSend()

bool V2Transport::SetMessageToSend ( CSerializedNetMsg & msg )

overridevirtualnoexcept

Set the next message to send.

If no message can currently be set (perhaps because the previous one is not yet done being sent), returns false, and msg will be unmodified. Otherwise msg is enqueued (and possibly moved-from) and true is returned.

Implements Transport.

Definition at line 1479 of file net.cpp.

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◆ SetReceiveState()

void V2Transport::SetReceiveState ( RecvState recv_state )

privatenoexcept

Change the receive state.

Definition at line 1017 of file net.cpp.

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◆ SetSendState()

void V2Transport::SetSendState ( SendState send_state )

privatenoexcept

Change the send state.

Definition at line 1048 of file net.cpp.

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◆ ShouldReconnectV1()

bool V2Transport::ShouldReconnectV1 ( ) const

overridevirtualnoexcept

Whether upon disconnections, a reconnect with V1 is warranted.

Implements Transport.

Definition at line 1550 of file net.cpp.

◆ StartSendingHandshake()

void V2Transport::StartSendingHandshake ( )

privatenoexcept

Put our public key + garbage in the send buffer.

Definition at line 986 of file net.cpp.

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Member Data Documentation

◆ !m_send_mutex [1/2]

bool V2Transport::!m_send_mutex

private

Definition at line 625 of file net.h.

◆ !m_send_mutex [2/2]

bool V2Transport::!m_send_mutex

private

Definition at line 627 of file net.h.

◆ m_cipher

BIP324Cipher V2Transport::m_cipher

private

Cipher state.

Definition at line 576 of file net.h.

◆ m_initiating

const bool V2Transport::m_initiating

private

Whether we are the initiator side.

Definition at line 578 of file net.h.

◆ m_nodeid

const NodeId V2Transport::m_nodeid

private

NodeId (for debug logging).

Definition at line 580 of file net.h.

◆ m_v1_fallback

V1Transport V2Transport::m_v1_fallback

private

Encapsulate a V1Transport to fall back to.

Definition at line 582 of file net.h.

◆ MAX_GARBAGE_LEN

constexpr uint32_t V2Transport::MAX_GARBAGE_LEN = 4095

staticconstexpr

Definition at line 634 of file net.h.

◆ V1_PREFIX_LEN

constexpr size_t V2Transport::V1_PREFIX_LEN = 16

staticconstexprprivate

The length of the V1 prefix to match bytes initially received by responders with to determine if their peer is speaking V1 or V2.

Definition at line 459 of file net.h.

◆ VERSION_CONTENTS

constexpr std::array<std::byte, 0> V2Transport::VERSION_CONTENTS = {}

staticconstexprprivate

Contents of the version packet to send.

BIP324 stipulates that senders should leave this empty, and receivers should ignore it. Future extensions can change what is sent as long as an empty version packet contents is interpreted as no extensions supported.

Definition at line 455 of file net.h.

The documentation for this class was generated from the following files:

src/net.h
src/net.cpp

Public Member Functions

Static Public Attributes

Private Types

Private Member Functions

Static Private Member Functions

Private Attributes

Static Private Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ RecvState

◆ SendState

Constructor & Destructor Documentation

◆ V2Transport() [1/2]

◆ V2Transport() [2/2]

Member Function Documentation

◆ ACQUIRED_AFTER()

◆ ACQUIRED_BEFORE()

◆ GetBytesToSend()

◆ GetInfo()

◆ GetMaxBytesToProcess()

◆ GetMessageType()

◆ GetReceivedMessage()

◆ GetSendMemoryUsage()

◆ GUARDED_BY() [1/11]

◆ GUARDED_BY() [2/11]

◆ GUARDED_BY() [3/11]

◆ GUARDED_BY() [4/11]

◆ GUARDED_BY() [5/11]

◆ GUARDED_BY() [6/11]

◆ GUARDED_BY() [7/11]

◆ GUARDED_BY() [8/11]

◆ GUARDED_BY() [9/11]

◆ GUARDED_BY() [10/11]

◆ GUARDED_BY() [11/11]

◆ MarkBytesSent()

◆ ProcessReceivedGarbageBytes()

◆ ProcessReceivedKeyBytes()

◆ ProcessReceivedMaybeV1Bytes()

◆ ProcessReceivedPacketBytes()

◆ ReceivedBytes()

◆ ReceivedMessageComplete()

◆ SetMessageToSend()

◆ SetReceiveState()

◆ SetSendState()

◆ ShouldReconnectV1()

◆ StartSendingHandshake()

Member Data Documentation

◆ !m_send_mutex [1/2]

◆ !m_send_mutex [2/2]

◆ m_cipher

◆ m_initiating

◆ m_nodeid

◆ m_v1_fallback

◆ MAX_GARBAGE_LEN

◆ V1_PREFIX_LEN

◆ VERSION_CONTENTS