#include <addrdb.h>
#include <addrman.h>
#include <amount.h>
#include <bloom.h>
#include <chainparams.h>
#include <compat.h>
#include <crypto/siphash.h>
#include <hash.h>
#include <net_permissions.h>
#include <netaddress.h>
#include <optional.h>
#include <policy/feerate.h>
#include <protocol.h>
#include <random.h>
#include <streams.h>
#include <sync.h>
#include <threadinterrupt.h>
#include <uint256.h>
#include <util/check.h>
#include <atomic>
#include <condition_variable>
#include <cstdint>
#include <deque>
#include <map>
#include <memory>
#include <thread>
#include <vector>

Include dependency graph for net.h:

This graph shows which files directly or indirectly include this file:

Classes
struct	AddedNodeInfo

struct	CSerializedNetMsg

struct	LocalServiceInfo

class	CNodeStats

class	CNetMessage
	Transport protocol agnostic message container. More...

class	TransportDeserializer
	The TransportDeserializer takes care of holding and deserializing the network receive buffer. More...

class	V1TransportDeserializer

class	TransportSerializer
	The TransportSerializer prepares messages for the network transport. More...

class	V1TransportSerializer

class	CNode
	Information about a peer. More...

struct	CNode::TxRelay

class	NetEventsInterface
	Interface for message handling. More...

class	CConnman

struct	CConnman::Options

struct	CConnman::ListenSocket

struct	CConnman::CachedAddrResponse
	Cache responses to addr requests to minimize privacy leak. More...

struct	NodeEvictionCandidate

Typedefs
typedef int64_t	NodeId

typedef std::map< std::string, uint64_t >	mapMsgCmdSize

Enumerations
enum	ConnectionType { ConnectionType::INBOUND, ConnectionType::OUTBOUND_FULL_RELAY, ConnectionType::MANUAL, ConnectionType::FEELER, ConnectionType::BLOCK_RELAY, ConnectionType::ADDR_FETCH }
	Different types of connections to a peer. More...

enum	{ LOCAL_NONE, LOCAL_IF, LOCAL_BIND, LOCAL_MAPPED, LOCAL_MANUAL, LOCAL_MAX }

Functions
std::string	ConnectionTypeAsString (ConnectionType conn_type)
	Convert ConnectionType enum to a string value. More...

void	Discover ()

uint16_t	GetListenPort ()

bool	IsPeerAddrLocalGood (CNode *pnode)

void	AdvertiseLocal (CNode *pnode)

void	SetReachable (enum Network net, bool reachable)
	Mark a network as reachable or unreachable (no automatic connects to it) More...

bool	IsReachable (enum Network net)

bool	IsReachable (const CNetAddr &addr)

bool	AddLocal (const CService &addr, int nScore=LOCAL_NONE)

bool	AddLocal (const CNetAddr &addr, int nScore=LOCAL_NONE)

void	RemoveLocal (const CService &addr)

bool	SeenLocal (const CService &addr)
	vote for a local address More...

bool	IsLocal (const CService &addr)
	check whether a given address is potentially local More...

bool	GetLocal (CService &addr, const CNetAddr *paddrPeer=nullptr)

CAddress	GetLocalAddress (const CNetAddr *paddrPeer, ServiceFlags nLocalServices)

std::map< CNetAddr, LocalServiceInfo > mapLocalHost	GUARDED_BY (cs_mapLocalHost)

int64_t	PoissonNextSend (int64_t now, int average_interval_seconds)
	Return a timestamp in the future (in microseconds) for exponentially distributed events. More...

std::chrono::microseconds	PoissonNextSend (std::chrono::microseconds now, std::chrono::seconds average_interval)
	Wrapper to return mockable type. More...

Optional< NodeId >	SelectNodeToEvict (std::vector< NodeEvictionCandidate > &&vEvictionCandidates)

Variables
static const bool	DEFAULT_WHITELISTRELAY = true
	Default for -whitelistrelay. More...

static const bool	DEFAULT_WHITELISTFORCERELAY = false
	Default for -whitelistforcerelay. More...

static const int	TIMEOUT_INTERVAL = 20 * 60
	Time after which to disconnect, after waiting for a ping response (or inactivity). More...

static const int	FEELER_INTERVAL = 120
	Run the feeler connection loop once every 2 minutes or 120 seconds. More...

static const int	EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL = 300
	Run the extra block-relay-only connection loop once every 5 minutes. More...

static constexpr size_t	MAX_ADDR_TO_SEND = 1000
	The maximum number of addresses from our addrman to return in response to a getaddr message. More...

static const unsigned int	MAX_PROTOCOL_MESSAGE_LENGTH = 4 * 1000 * 1000
	Maximum length of incoming protocol messages (no message over 4 MB is currently acceptable). More...

static const unsigned int	MAX_SUBVERSION_LENGTH = 256
	Maximum length of the user agent string in `version` message. More...

static const int	MAX_OUTBOUND_FULL_RELAY_CONNECTIONS = 8
	Maximum number of automatic outgoing nodes over which we'll relay everything (blocks, tx, addrs, etc) More...

static const int	MAX_ADDNODE_CONNECTIONS = 8
	Maximum number of addnode outgoing nodes. More...

static const int	MAX_BLOCK_RELAY_ONLY_CONNECTIONS = 2
	Maximum number of block-relay-only outgoing connections. More...

static const int	MAX_FEELER_CONNECTIONS = 1
	Maximum number of feeler connections. More...

static const bool	DEFAULT_LISTEN = true
	-listen default More...

static const unsigned int	DEFAULT_MAX_PEER_CONNECTIONS = 125
	The maximum number of peer connections to maintain. More...

static constexpr uint64_t	DEFAULT_MAX_UPLOAD_TARGET = 0
	The default for -maxuploadtarget. More...

static const bool	DEFAULT_BLOCKSONLY = false
	Default for blocks only. More...

static const int64_t	DEFAULT_PEER_CONNECT_TIMEOUT = 60
	-peertimeout default More...

static const bool	DEFAULT_FORCEDNSSEED = false

static const size_t	DEFAULT_MAXRECEIVEBUFFER = 5 * 1000

static const size_t	DEFAULT_MAXSENDBUFFER = 1 * 1000

bool	fDiscover

bool	fListen

std::string	strSubVersion
	Subversion as sent to the P2P network in `version` messages. More...

RecursiveMutex	cs_mapLocalHost

const std::string	NET_MESSAGE_COMMAND_OTHER

Typedef Documentation

◆ mapMsgCmdSize

typedef std::map<std::string, uint64_t> mapMsgCmdSize

Definition at line 230 of file net.h.

◆ NodeId

typedef int64_t NodeId

Definition at line 83 of file net.h.

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Enumerator
LOCAL_NONE
LOCAL_IF
LOCAL_BIND
LOCAL_MAPPED
LOCAL_MANUAL
LOCAL_MAX

Definition at line 182 of file net.h.

◆ ConnectionType

enum ConnectionType

strong

Different types of connections to a peer.

This enum encapsulates the information we have available at the time of opening or accepting the connection. Aside from INBOUND, all types are initiated by us.

If adding or removing types, please update CONNECTION_TYPE_DOC in src/rpc/net.cpp.

Enumerator
INBOUND	Inbound connections are those initiated by a peer. This is the only property we know at the time of connection, until P2P messages are exchanged.
OUTBOUND_FULL_RELAY	These are the default connections that we use to connect with the network. There is no restriction on what is relayed- by default we relay blocks, addresses & transactions. We automatically attempt to open MAX_OUTBOUND_FULL_RELAY_CONNECTIONS using addresses from our AddrMan.
MANUAL	We open manual connections to addresses that users explicitly inputted via the addnode RPC, or the -connect command line argument. Even if a manual connection is misbehaving, we do not automatically disconnect or add it to our discouragement filter.
FEELER	Feeler connections are short-lived connections made to check that a node is alive. They can be useful for: test-before-evict: if one of the peers is considered for eviction from our AddrMan because another peer is mapped to the same slot in the tried table, evict only if this longer-known peer is offline. move node addresses from New to Tried table, so that we have more connectable addresses in our AddrMan. Note that in the literature ("Eclipse Attacks on Bitcoin’s Peer-to-Peer Network") only the latter feature is referred to as "feeler connections", although in our codebase feeler connections encompass test-before-evict as well. We make these connections approximately every FEELER_INTERVAL: first we resolve previously found collisions if they exist (test-before-evict), otherwise connect to a node from the new table.
BLOCK_RELAY	We use block-relay-only connections to help prevent against partition attacks. By not relaying transactions or addresses, these connections are harder to detect by a third party, thus helping obfuscate the network topology. We automatically attempt to open MAX_BLOCK_RELAY_ONLY_ANCHORS using addresses from our anchors.dat. Then addresses from our AddrMan if MAX_BLOCK_RELAY_ONLY_CONNECTIONS isn't reached yet.
ADDR_FETCH	AddrFetch connections are short lived connections used to solicit addresses from peers. These are initiated to addresses submitted via the -seednode command line argument, or under certain conditions when the AddrMan is empty.

Definition at line 115 of file net.h.

Function Documentation

◆ AddLocal() [1/2]

bool AddLocal	(	const CService &	addr,
		int	nScore = `LOCAL_NONE`
	)

Definition at line 230 of file net.cpp.

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◆ AddLocal() [2/2]

bool AddLocal	(	const CNetAddr &	addr,
		int	nScore = `LOCAL_NONE`
	)

Definition at line 256 of file net.cpp.

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◆ AdvertiseLocal()

void AdvertiseLocal ( CNode * pnode )

Definition at line 203 of file net.cpp.

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◆ ConnectionTypeAsString()

std::string ConnectionTypeAsString ( ConnectionType conn_type )

Convert ConnectionType enum to a string value.

Definition at line 501 of file net.cpp.

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◆ Discover()

void Discover ( )

Definition at line 2229 of file net.cpp.

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◆ GetListenPort()

uint16_t GetListenPort ( )

Definition at line 120 of file net.cpp.

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◆ GetLocal()

bool GetLocal	(	CService &	addr,
		const CNetAddr *	paddrPeer = `nullptr`
	)

Definition at line 126 of file net.cpp.

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◆ GetLocalAddress()

CAddress GetLocalAddress	(	const CNetAddr *	paddrPeer,
		ServiceFlags	nLocalServices
	)

Definition at line 175 of file net.cpp.

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◆ GUARDED_BY()

std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY ( cs_mapLocalHost )

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◆ IsLocal()

bool IsLocal ( const CService & addr )

check whether a given address is potentially local

Definition at line 301 of file net.cpp.

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◆ IsPeerAddrLocalGood()

bool IsPeerAddrLocalGood ( CNode * pnode )

Definition at line 195 of file net.cpp.

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◆ IsReachable() [1/2]

bool IsReachable ( enum Network net )

Returns: true if the network is reachable, false otherwise

Definition at line 276 of file net.cpp.

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◆ IsReachable() [2/2]

bool IsReachable ( const CNetAddr & addr )

Returns: true if the address is in a reachable network, false otherwise

Definition at line 282 of file net.cpp.

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◆ PoissonNextSend() [1/2]

int64_t PoissonNextSend	(	int64_t	now,
		int	average_interval_seconds
	)

Return a timestamp in the future (in microseconds) for exponentially distributed events.

Definition at line 2920 of file net.cpp.

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◆ PoissonNextSend() [2/2]

std::chrono::microseconds PoissonNextSend	(	std::chrono::microseconds	now,
		std::chrono::seconds	average_interval
	)

inline

Wrapper to return mockable type.

Definition at line 1237 of file net.h.

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◆ RemoveLocal()

void RemoveLocal ( const CService & addr )

Definition at line 261 of file net.cpp.

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◆ SeenLocal()

bool SeenLocal ( const CService & addr )

vote for a local address

Definition at line 288 of file net.cpp.

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◆ SelectNodeToEvict()

Optional<NodeId> SelectNodeToEvict ( std::vector< NodeEvictionCandidate > && vEvictionCandidates )

Definition at line 889 of file net.cpp.

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◆ SetReachable()

void SetReachable	(	enum Network	net,
		bool	reachable
	)

Mark a network as reachable or unreachable (no automatic connects to it)

Note: Networks are reachable by default

Definition at line 268 of file net.cpp.

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Variable Documentation

◆ cs_mapLocalHost

RecursiveMutex cs_mapLocalHost

Definition at line 109 of file net.cpp.

◆ DEFAULT_BLOCKSONLY

const bool DEFAULT_BLOCKSONLY = false

static

Default for blocks only.

Definition at line 75 of file net.h.

◆ DEFAULT_FORCEDNSSEED

const bool DEFAULT_FORCEDNSSEED = false

static

Definition at line 79 of file net.h.

◆ DEFAULT_LISTEN

const bool DEFAULT_LISTEN = true

static

-listen default

Definition at line 69 of file net.h.

◆ DEFAULT_MAX_PEER_CONNECTIONS

const unsigned int DEFAULT_MAX_PEER_CONNECTIONS = 125

static

The maximum number of peer connections to maintain.

Definition at line 71 of file net.h.

◆ DEFAULT_MAX_UPLOAD_TARGET

constexpr uint64_t DEFAULT_MAX_UPLOAD_TARGET = 0

static

The default for -maxuploadtarget.

0 = Unlimited

Definition at line 73 of file net.h.

◆ DEFAULT_MAXRECEIVEBUFFER

const size_t DEFAULT_MAXRECEIVEBUFFER = 5 * 1000

static

Definition at line 80 of file net.h.

◆ DEFAULT_MAXSENDBUFFER

const size_t DEFAULT_MAXSENDBUFFER = 1 * 1000

static

Definition at line 81 of file net.h.

◆ DEFAULT_PEER_CONNECT_TIMEOUT

const int64_t DEFAULT_PEER_CONNECT_TIMEOUT = 60

static

-peertimeout default

Definition at line 77 of file net.h.

◆ DEFAULT_WHITELISTFORCERELAY

const bool DEFAULT_WHITELISTFORCERELAY = false

static

Default for -whitelistforcerelay.

Definition at line 46 of file net.h.

◆ DEFAULT_WHITELISTRELAY

const bool DEFAULT_WHITELISTRELAY = true

static

Default for -whitelistrelay.

Definition at line 44 of file net.h.

◆ EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL

const int EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL = 300

static

Run the extra block-relay-only connection loop once every 5 minutes.

Definition at line 53 of file net.h.

◆ fDiscover

bool fDiscover

Definition at line 107 of file net.cpp.

◆ FEELER_INTERVAL

const int FEELER_INTERVAL = 120

static

Run the feeler connection loop once every 2 minutes or 120 seconds.

Definition at line 51 of file net.h.

◆ fListen

bool fListen

Definition at line 108 of file net.cpp.

◆ MAX_ADDNODE_CONNECTIONS

const int MAX_ADDNODE_CONNECTIONS = 8

static

Maximum number of addnode outgoing nodes.

Definition at line 63 of file net.h.

◆ MAX_ADDR_TO_SEND

constexpr size_t MAX_ADDR_TO_SEND = 1000

static

The maximum number of addresses from our addrman to return in response to a getaddr message.

Definition at line 55 of file net.h.

◆ MAX_BLOCK_RELAY_ONLY_CONNECTIONS

const int MAX_BLOCK_RELAY_ONLY_CONNECTIONS = 2

static

Maximum number of block-relay-only outgoing connections.

Definition at line 65 of file net.h.

◆ MAX_FEELER_CONNECTIONS

const int MAX_FEELER_CONNECTIONS = 1

static

Maximum number of feeler connections.

Definition at line 67 of file net.h.

◆ MAX_OUTBOUND_FULL_RELAY_CONNECTIONS

const int MAX_OUTBOUND_FULL_RELAY_CONNECTIONS = 8

static

Maximum number of automatic outgoing nodes over which we'll relay everything (blocks, tx, addrs, etc)

Definition at line 61 of file net.h.

◆ MAX_PROTOCOL_MESSAGE_LENGTH

const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 4 * 1000 * 1000

static

Maximum length of incoming protocol messages (no message over 4 MB is currently acceptable).

Definition at line 57 of file net.h.

◆ MAX_SUBVERSION_LENGTH

const unsigned int MAX_SUBVERSION_LENGTH = 256

static

Maximum length of the user agent string in version message.

Definition at line 59 of file net.h.

◆ NET_MESSAGE_COMMAND_OTHER

const std::string NET_MESSAGE_COMMAND_OTHER

Definition at line 99 of file net.cpp.

◆ strSubVersion

std::string strSubVersion

Subversion as sent to the P2P network in version messages.

Definition at line 112 of file net.cpp.

◆ TIMEOUT_INTERVAL

const int TIMEOUT_INTERVAL = 20 * 60

static

Time after which to disconnect, after waiting for a ping response (or inactivity).

Definition at line 49 of file net.h.

Classes

Typedefs

Enumerations

Functions

Variables

Typedef Documentation

◆ mapMsgCmdSize

◆ NodeId

Enumeration Type Documentation

◆ anonymous enum

◆ ConnectionType

Function Documentation

◆ AddLocal() [1/2]

◆ AddLocal() [2/2]

◆ AdvertiseLocal()

◆ ConnectionTypeAsString()

◆ Discover()

◆ GetListenPort()

◆ GetLocal()

◆ GetLocalAddress()

◆ GUARDED_BY()

◆ IsLocal()

◆ IsPeerAddrLocalGood()

◆ IsReachable() [1/2]

◆ IsReachable() [2/2]

◆ PoissonNextSend() [1/2]

◆ PoissonNextSend() [2/2]

◆ RemoveLocal()

◆ SeenLocal()

◆ SelectNodeToEvict()

◆ SetReachable()

Variable Documentation

◆ cs_mapLocalHost

◆ DEFAULT_BLOCKSONLY

◆ DEFAULT_FORCEDNSSEED

◆ DEFAULT_LISTEN

◆ DEFAULT_MAX_PEER_CONNECTIONS

◆ DEFAULT_MAX_UPLOAD_TARGET

◆ DEFAULT_MAXRECEIVEBUFFER

◆ DEFAULT_MAXSENDBUFFER

◆ DEFAULT_PEER_CONNECT_TIMEOUT

◆ DEFAULT_WHITELISTFORCERELAY

◆ DEFAULT_WHITELISTRELAY

◆ EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL

◆ fDiscover

◆ FEELER_INTERVAL

◆ fListen

◆ MAX_ADDNODE_CONNECTIONS

◆ MAX_ADDR_TO_SEND

◆ MAX_BLOCK_RELAY_ONLY_CONNECTIONS

◆ MAX_FEELER_CONNECTIONS

◆ MAX_OUTBOUND_FULL_RELAY_CONNECTIONS

◆ MAX_PROTOCOL_MESSAGE_LENGTH

◆ MAX_SUBVERSION_LENGTH

◆ NET_MESSAGE_COMMAND_OTHER

◆ strSubVersion

◆ TIMEOUT_INTERVAL