net.cpp File Reference

#include <net.h>
#include <addrdb.h>
#include <banman.h>
#include <clientversion.h>
#include <compat.h>
#include <consensus/consensus.h>
#include <crypto/sha256.h>
#include <i2p.h>
#include <net_permissions.h>
#include <netaddress.h>
#include <netbase.h>
#include <node/ui_interface.h>
#include <protocol.h>
#include <random.h>
#include <scheduler.h>
#include <util/sock.h>
#include <util/strencodings.h>
#include <util/syscall_sandbox.h>
#include <util/system.h>
#include <util/thread.h>
#include <util/trace.h>
#include <util/translation.h>
#include <fcntl.h>
#include <algorithm>
#include <array>
#include <cstdint>
#include <functional>
#include <optional>
#include <unordered_map>
#include <math.h>

Include dependency graph for net.cpp:

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Classes
struct	CompareNodeNetworkTime
	Sort eviction candidates by network/localhost and connection uptime. More...
class	CNetCleanup

Macros
#define	FEELER_SLEEP_WINDOW   1
#define	X(name)   stats.name = name

Enumerations
enum	BindFlags { BF_NONE = 0, BF_EXPLICIT = (1U << 0), BF_REPORT_ERROR = (1U << 1), BF_DONT_ADVERTISE = (1U << 2) }
	Used to pass flags to the Bind() function. More...

Functions
std::map< CNetAddr, LocalServiceInfo > mapLocalHost	GUARDED_BY (cs_mapLocalHost)
uint16_t	GetListenPort ()
bool	GetLocal (CService &addr, const CNetAddr *paddrPeer)
static std::vector< CAddress >	ConvertSeeds (const std::vector< uint8_t > &vSeedsIn)
	Convert the serialized seeds into usable address objects. More...
CAddress	GetLocalAddress (const CNetAddr *paddrPeer, ServiceFlags nLocalServices)
static int	GetnScore (const CService &addr)
bool	IsPeerAddrLocalGood (CNode *pnode)
std::optional< CAddress >	GetLocalAddrForPeer (CNode *pnode)
	Returns a local address that we should advertise to this peer. More...
bool	AddLocal (const CService &addr, int nScore)
bool	AddLocal (const CNetAddr &addr, int nScore)
void	RemoveLocal (const CService &addr)
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	SeenLocal (const CService &addr)
	vote for a local address More...
bool	IsLocal (const CService &addr)
	check whether a given address is potentially local More...
static CAddress	GetBindAddress (SOCKET sock)
	Get the bind address for a socket as CAddress. More...
std::string	ConnectionTypeAsString (ConnectionType conn_type)
	Convert ConnectionType enum to a string value. More...
static bool	ReverseCompareNodeMinPingTime (const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
static bool	ReverseCompareNodeTimeConnected (const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
static bool	CompareNetGroupKeyed (const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
static bool	CompareNodeBlockTime (const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
static bool	CompareNodeTXTime (const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
static bool	CompareNodeBlockRelayOnlyTime (const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
template<typename T , typename Comparator >
static void	EraseLastKElements (std::vector< T > &elements, Comparator comparator, size_t k, std::function< bool(const NodeEvictionCandidate &)> predicate=[](const NodeEvictionCandidate &n) { return true;})
	Sort an array by the specified comparator, then erase the last K elements where predicate is true. More...
void	ProtectEvictionCandidatesByRatio (std::vector< NodeEvictionCandidate > &eviction_candidates)
	Protect desirable or disadvantaged inbound peers from eviction by ratio. More...
std::optional< NodeId >	SelectNodeToEvict (std::vector< NodeEvictionCandidate > &&vEvictionCandidates)
	Select an inbound peer to evict after filtering out (protecting) peers having distinct, difficult-to-forge characteristics. More...
void	Discover ()
std::chrono::microseconds	PoissonNextSend (std::chrono::microseconds now, std::chrono::seconds average_interval)
	Return a timestamp in the future (in microseconds) for exponentially distributed events. More...
void	CaptureMessage (const CAddress &addr, const std::string &msg_type, const Span< const unsigned char > &data, bool is_incoming)
	Dump binary message to file, with timestamp. More...

Variables
static constexpr size_t	MAX_BLOCK_RELAY_ONLY_ANCHORS = 2
	Maximum number of block-relay-only anchor connections. More...
const char *const	ANCHORS_DATABASE_FILENAME = "anchors.dat"
	Anchor IP address database file name. More...
static constexpr std::chrono::minutes	DUMP_PEERS_INTERVAL {15}
static constexpr int	DNSSEEDS_TO_QUERY_AT_ONCE = 3
	Number of DNS seeds to query when the number of connections is low. More...
static constexpr std::chrono::seconds	DNSSEEDS_DELAY_FEW_PEERS {11}
	How long to delay before querying DNS seeds. More...
static constexpr std::chrono::minutes	DNSSEEDS_DELAY_MANY_PEERS {5}
static constexpr int	DNSSEEDS_DELAY_PEER_THRESHOLD = 1000
static constexpr std::chrono::seconds	MAX_UPLOAD_TIMEFRAME {60 * 60 * 24}
	The default timeframe for -maxuploadtarget. More...
static const uint64_t	SELECT_TIMEOUT_MILLISECONDS = 50
const std::string	NET_MESSAGE_COMMAND_OTHER = "*other*"
static const uint64_t	RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL
static const uint64_t	RANDOMIZER_ID_LOCALHOSTNONCE = 0xd93e69e2bbfa5735ULL
static const uint64_t	RANDOMIZER_ID_ADDRCACHE = 0x1cf2e4ddd306dda9ULL
bool	fDiscover = true
bool	fListen = true
RecursiveMutex	cs_mapLocalHost
std::string	strSubVersion
	Subversion as sent to the P2P network in version messages. More...
static CNetCleanup	instance_of_cnetcleanup

Macro Definition Documentation

FEELER_SLEEP_WINDOW

#define FEELER_SLEEP_WINDOW   1

Definition at line 86 of file net.cpp.

X

#define X

(

name

)

stats.name = name

Definition at line 555 of file net.cpp.

Enumeration Type Documentation

BindFlags

enum BindFlags

Used to pass flags to the Bind() function.

Enumerator
BF_NONE
BF_EXPLICIT
BF_REPORT_ERROR
BF_DONT_ADVERTISE	Do not call AddLocal() for our special addresses, e.g., for incoming Tor connections, to prevent gossiping them over the network.

Definition at line 89 of file net.cpp.

Function Documentation

AddLocal() [1/2]

bool AddLocal	(	const CNetAddr &	addr,
		int	nScore
	)

Definition at line 260 of file net.cpp.

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AddLocal() [2/2]

bool AddLocal	(	const CService &	addr,
		int	nScore
	)

Definition at line 234 of file net.cpp.

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CaptureMessage()

void CaptureMessage	(	const CAddress &	addr,
		const std::string &	msg_type,
		const Span< const unsigned char > &	data,
		bool	is_incoming
	)

Dump binary message to file, with timestamp.

Definition at line 3081 of file net.cpp.

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CompareNetGroupKeyed()

static bool CompareNetGroupKeyed ( const NodeEvictionCandidate &  a, const NodeEvictionCandidate &  b  )

static

Definition at line 832 of file net.cpp.

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CompareNodeBlockRelayOnlyTime()

static bool CompareNodeBlockRelayOnlyTime ( const NodeEvictionCandidate &  a, const NodeEvictionCandidate &  b  )

static

Definition at line 854 of file net.cpp.

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CompareNodeBlockTime()

static bool CompareNodeBlockTime ( const NodeEvictionCandidate &  a, const NodeEvictionCandidate &  b  )

static

Definition at line 836 of file net.cpp.

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CompareNodeTXTime()

static bool CompareNodeTXTime ( const NodeEvictionCandidate &  a, const NodeEvictionCandidate &  b  )

static

Definition at line 844 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 514 of file net.cpp.

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ConvertSeeds()

static std::vector<CAddress> ConvertSeeds ( const std::vector< uint8_t > &  vSeedsIn )

static

Convert the serialized seeds into usable address objects.

Definition at line 156 of file net.cpp.

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Discover()

void Discover

(

)

Definition at line 2381 of file net.cpp.

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EraseLastKElements()

template<typename T , typename Comparator >

static void EraseLastKElements ( std::vector< T > &  elements, Comparator  comparator, size_t  k, std::function< bool(const NodeEvictionCandidate &)>  predicate = [](const NodeEvictionCandidate& n) { return true; }  )

static

Sort an array by the specified comparator, then erase the last K elements where predicate is true.

Definition at line 884 of file net.cpp.

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GetBindAddress()

static CAddress GetBindAddress ( SOCKET  sock )

static

Get the bind address for a socket as CAddress.

Definition at line 369 of file net.cpp.

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GetListenPort()

uint16_t GetListenPort

(

)

Definition at line 125 of file net.cpp.

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GetLocal()

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

Definition at line 131 of file net.cpp.

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GetLocalAddress()

CAddress GetLocalAddress	(	const CNetAddr *	paddrPeer,
		ServiceFlags	nLocalServices
	)

Definition at line 181 of file net.cpp.

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GetLocalAddrForPeer()

std::optional<CAddress> GetLocalAddrForPeer

(

CNode *

pnode

)

Returns a local address that we should advertise to this peer.

Definition at line 208 of file net.cpp.

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GetnScore()

static int GetnScore ( const CService &  addr )

static

Definition at line 193 of file net.cpp.

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GUARDED_BY()

std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY

(

cs_mapLocalHost

)

IsLocal()

bool IsLocal

(

const CService &

addr

)

check whether a given address is potentially local

Definition at line 303 of file net.cpp.

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IsPeerAddrLocalGood()

bool IsPeerAddrLocalGood

(

CNode *

pnode

)

Definition at line 201 of file net.cpp.

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IsReachable() [1/2]

bool IsReachable

(

const CNetAddr &

addr

)

Returns

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

Definition at line 286 of file net.cpp.

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IsReachable() [2/2]

bool IsReachable

(

enum Network

net

)

Returns

true if the network is reachable, false otherwise

Definition at line 280 of file net.cpp.

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PoissonNextSend()

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

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

Definition at line 3063 of file net.cpp.

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ProtectEvictionCandidatesByRatio()

void ProtectEvictionCandidatesByRatio

(

std::vector< NodeEvictionCandidate > &

vEvictionCandidates

)

Protect desirable or disadvantaged inbound peers from eviction by ratio.

This function protects half of the peers which have been connected the longest, to replicate the non-eviction implicit behavior and preclude attacks that start later.

Half of these protected spots (1/4 of the total) are reserved for the following categories of peers, sorted by longest uptime, even if they're not longest uptime overall:

• onion peers connected via our tor control service
• localhost peers, as manually configured hidden services not using -bind=addr[:port]=onion will not be detected as inbound onion connections
• I2P peers

This helps protect these privacy network peers, which tend to be otherwise disadvantaged under our eviction criteria for their higher min ping times relative to IPv4/IPv6 peers, and favorise the diversity of peer connections.

Definition at line 893 of file net.cpp.

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RemoveLocal()

void RemoveLocal

(

const CService &

addr

)

Definition at line 265 of file net.cpp.

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ReverseCompareNodeMinPingTime()

static bool ReverseCompareNodeMinPingTime ( const NodeEvictionCandidate &  a, const NodeEvictionCandidate &  b  )

static

Definition at line 822 of file net.cpp.

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ReverseCompareNodeTimeConnected()

static bool ReverseCompareNodeTimeConnected ( const NodeEvictionCandidate &  a, const NodeEvictionCandidate &  b  )

static

Definition at line 827 of file net.cpp.

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SeenLocal()

bool SeenLocal

(

const CService &

addr

)

vote for a local address

Definition at line 292 of file net.cpp.

SelectNodeToEvict()

std::optional<NodeId> SelectNodeToEvict

(

std::vector< NodeEvictionCandidate > &&

vEvictionCandidates

)

Select an inbound peer to evict after filtering out (protecting) peers having distinct, difficult-to-forge characteristics.

The protection logic picks out fixed numbers of desirable peers per various criteria, followed by (mostly) ratios of desirable or disadvantaged peers. If any eviction candidates remain, the selection logic chooses a peer to evict.

Definition at line 966 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 272 of file net.cpp.

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Variable Documentation

ANCHORS_DATABASE_FILENAME

const char* const ANCHORS_DATABASE_FILENAME = "anchors.dat"

Anchor IP address database file name.

Definition at line 61 of file net.cpp.

cs_mapLocalHost

RecursiveMutex cs_mapLocalHost

Definition at line 114 of file net.cpp.

DNSSEEDS_DELAY_FEW_PEERS

constexpr std::chrono::seconds DNSSEEDS_DELAY_FEW_PEERS {11}

staticconstexpr

How long to delay before querying DNS seeds.

If we have more than THRESHOLD entries in addrman, then it's likely that we got those addresses from having previously connected to the P2P network, and that we'll be able to successfully reconnect to the P2P network via contacting one of them. So if that's the case, spend a little longer trying to connect to known peers before querying the DNS seeds.

Definition at line 78 of file net.cpp.

DNSSEEDS_DELAY_MANY_PEERS

constexpr std::chrono::minutes DNSSEEDS_DELAY_MANY_PEERS {5}

staticconstexpr

Definition at line 79 of file net.cpp.

DNSSEEDS_DELAY_PEER_THRESHOLD

constexpr int DNSSEEDS_DELAY_PEER_THRESHOLD = 1000

staticconstexpr

Definition at line 80 of file net.cpp.

DNSSEEDS_TO_QUERY_AT_ONCE

constexpr int DNSSEEDS_TO_QUERY_AT_ONCE = 3

staticconstexpr

Number of DNS seeds to query when the number of connections is low.

Definition at line 67 of file net.cpp.

DUMP_PEERS_INTERVAL

constexpr std::chrono::minutes DUMP_PEERS_INTERVAL {15}

staticconstexpr

Definition at line 64 of file net.cpp.

fDiscover

bool fDiscover = true

Definition at line 112 of file net.cpp.

fListen

bool fListen = true

Definition at line 113 of file net.cpp.

instance_of_cnetcleanup

CNetCleanup instance_of_cnetcleanup

static

Definition at line 2616 of file net.cpp.

MAX_BLOCK_RELAY_ONLY_ANCHORS

constexpr size_t MAX_BLOCK_RELAY_ONLY_ANCHORS = 2

staticconstexpr

Maximum number of block-relay-only anchor connections.

Definition at line 58 of file net.cpp.

MAX_UPLOAD_TIMEFRAME

constexpr std::chrono::seconds MAX_UPLOAD_TIMEFRAME {60 * 60 * 24}

staticconstexpr

The default timeframe for -maxuploadtarget.

1 day.

Definition at line 83 of file net.cpp.

NET_MESSAGE_COMMAND_OTHER

const std::string NET_MESSAGE_COMMAND_OTHER = "*other*"

Definition at line 104 of file net.cpp.

RANDOMIZER_ID_ADDRCACHE

const uint64_t RANDOMIZER_ID_ADDRCACHE = 0x1cf2e4ddd306dda9ULL

static

Definition at line 108 of file net.cpp.

RANDOMIZER_ID_LOCALHOSTNONCE

const uint64_t RANDOMIZER_ID_LOCALHOSTNONCE = 0xd93e69e2bbfa5735ULL

static

Definition at line 107 of file net.cpp.

RANDOMIZER_ID_NETGROUP

const uint64_t RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL

static

Definition at line 106 of file net.cpp.

SELECT_TIMEOUT_MILLISECONDS

const uint64_t SELECT_TIMEOUT_MILLISECONDS = 50

static

Definition at line 102 of file net.cpp.

strSubVersion

std::string strSubVersion

Subversion as sent to the P2P network in version messages.

Definition at line 117 of file net.cpp.