net.cpp File Reference

#include <config/bitcoin-config.h>
#include <net.h>
#include <addrdb.h>
#include <addrman.h>
#include <banman.h>
#include <clientversion.h>
#include <common/args.h>
#include <compat/compat.h>
#include <consensus/consensus.h>
#include <crypto/sha256.h>
#include <i2p.h>
#include <key.h>
#include <logging.h>
#include <memusage.h>
#include <net_permissions.h>
#include <netaddress.h>
#include <netbase.h>
#include <node/eviction.h>
#include <node/interface_ui.h>
#include <protocol.h>
#include <random.h>
#include <scheduler.h>
#include <util/fs.h>
#include <util/sock.h>
#include <util/strencodings.h>
#include <util/thread.h>
#include <util/threadinterrupt.h>
#include <util/trace.h>
#include <util/translation.h>
#include <util/vector.h>
#include <ifaddrs.h>
#include <algorithm>
#include <array>
#include <cstdint>
#include <functional>
#include <optional>
#include <unordered_map>
#include <math.h>

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Classes
class	CNetCleanup

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

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

Functions
std::map< CNetAddr, LocalServiceInfo > mapLocalHost	GUARDED_BY (g_maplocalhost_mutex)
uint16_t	GetListenPort ()
static std::optional< CService >	GetLocal (const CNode &peer)
static std::vector< CAddress >	ConvertSeeds (const std::vector< uint8_t > &vSeedsIn)
	Convert the serialized seeds into usable address objects. More...
CService	GetLocalAddress (const CNode &peer)
static int	GetnScore (const CService &addr)
static bool	IsPeerAddrLocalGood (CNode *pnode)
std::optional< CService >	GetLocalAddrForPeer (CNode &node)
	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)
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 (const Sock &sock)
	Get the bind address for a socket as CAddress. More...
void	Discover ()
	Look up IP addresses from all interfaces on the machine and add them to the list of local addresses to self-advertise. More...
static std::unique_ptr< Transport >	MakeTransport (NodeId id, bool use_v2transport, bool inbound) noexcept
static void	CaptureMessageToFile (const CAddress &addr, const std::string &msg_type, Span< const unsigned char > data, bool is_incoming)

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 constexpr auto	FEELER_SLEEP_WINDOW {1s}
static constexpr auto	EXTRA_NETWORK_PEER_INTERVAL {5min}
	Frequency to attempt extra connections to reachable networks we're not connected to yet. More...
static const uint64_t	SELECT_TIMEOUT_MILLISECONDS = 50
const std::string	NET_MESSAGE_TYPE_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
GlobalMutex	g_maplocalhost_mutex
std::string	strSubVersion
	Subversion as sent to the P2P network in version messages. More...
static CNetCleanup	instance_of_cnetcleanup
std::function< void(const CAddress &addr, const std::string &msg_type, Span< const unsigned char > data, bool is_incoming)>	CaptureMessage = CaptureMessageToFile
	Defaults to CaptureMessageToFile(), but can be overridden by unit tests. More...

Macro Definition Documentation

X

#define X

(

name

)

stats.name = name

Definition at line 601 of file net.cpp.

Enumeration Type Documentation

BindFlags

enum BindFlags

Used to pass flags to the Bind() function.

Enumerator
BF_NONE
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 91 of file net.cpp.

Function Documentation

AddLocal() [1/2]

bool AddLocal	(	const CService &	addr_,
		int	nScore
	)

Definition at line 266 of file net.cpp.

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AddLocal() [2/2]

bool AddLocal	(	const CNetAddr &	addr,
		int	nScore
	)

Definition at line 294 of file net.cpp.

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CaptureMessageToFile()

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

static

Definition at line 3921 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 190 of file net.cpp.

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Discover()

void Discover

(

)

Look up IP addresses from all interfaces on the machine and add them to the list of local addresses to self-advertise.

The loopback interface is skipped.

Definition at line 3088 of file net.cpp.

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GetBindAddress()

static CAddress GetBindAddress ( const Sock &  sock )

static

Get the bind address for a socket as CAddress.

Definition at line 373 of file net.cpp.

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GetListenPort()

uint16_t GetListenPort

(

)

Definition at line 133 of file net.cpp.

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GetLocal()

static std::optional<CService> GetLocal ( const CNode &  peer )

static

Definition at line 160 of file net.cpp.

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GetLocalAddress()

CService GetLocalAddress

(

const CNode &

peer

)

Definition at line 215 of file net.cpp.

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GetLocalAddrForPeer()

std::optional<CService> GetLocalAddrForPeer

(

CNode &

node

)

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

Definition at line 235 of file net.cpp.

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GetnScore()

static int GetnScore ( const CService &  addr )

static

Definition at line 220 of file net.cpp.

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GUARDED_BY()

std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY

(

g_maplocalhost_mutex

)

IsLocal()

bool IsLocal

(

const CService &

addr

)

check whether a given address is potentially local

Definition at line 318 of file net.cpp.

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IsPeerAddrLocalGood()

static bool IsPeerAddrLocalGood ( CNode *  pnode )

static

Definition at line 228 of file net.cpp.

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MakeTransport()

static std::unique_ptr<Transport> MakeTransport ( NodeId  id, bool  use_v2transport, bool  inbound  )

staticnoexcept

Definition at line 3722 of file net.cpp.

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RemoveLocal()

void RemoveLocal

(

const CService &

addr

)

Definition at line 299 of file net.cpp.

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SeenLocal()

bool SeenLocal

(

const CService &

addr

)

vote for a local address

Definition at line 307 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 60 of file net.cpp.

CaptureMessage

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

Defaults to CaptureMessageToFile(), but can be overridden by unit tests.

Definition at line 3956 of file net.cpp.

DNSSEEDS_DELAY_FEW_PEERS

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

static

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 77 of file net.cpp.

DNSSEEDS_DELAY_MANY_PEERS

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

static

Definition at line 78 of file net.cpp.

DNSSEEDS_DELAY_PEER_THRESHOLD

constexpr int DNSSEEDS_DELAY_PEER_THRESHOLD = 1000

static

Definition at line 79 of file net.cpp.

DNSSEEDS_TO_QUERY_AT_ONCE

constexpr int DNSSEEDS_TO_QUERY_AT_ONCE = 3

static

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

Definition at line 66 of file net.cpp.

DUMP_PEERS_INTERVAL

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

static

Definition at line 63 of file net.cpp.

EXTRA_NETWORK_PEER_INTERVAL

constexpr auto EXTRA_NETWORK_PEER_INTERVAL {5min}

static

Frequency to attempt extra connections to reachable networks we're not connected to yet.

Definition at line 88 of file net.cpp.

fDiscover

bool fDiscover = true

Definition at line 113 of file net.cpp.

FEELER_SLEEP_WINDOW

constexpr auto FEELER_SLEEP_WINDOW {1s}

static

Definition at line 85 of file net.cpp.

fListen

bool fListen = true

Definition at line 114 of file net.cpp.

g_maplocalhost_mutex

GlobalMutex g_maplocalhost_mutex

Definition at line 115 of file net.cpp.

instance_of_cnetcleanup

CNetCleanup instance_of_cnetcleanup

static

Definition at line 3352 of file net.cpp.

MAX_BLOCK_RELAY_ONLY_ANCHORS

constexpr size_t MAX_BLOCK_RELAY_ONLY_ANCHORS = 2

static

Maximum number of block-relay-only anchor connections.

Definition at line 57 of file net.cpp.

MAX_UPLOAD_TIMEFRAME

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

static

The default timeframe for -maxuploadtarget.

1 day.

Definition at line 82 of file net.cpp.

NET_MESSAGE_TYPE_OTHER

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

Definition at line 105 of file net.cpp.

RANDOMIZER_ID_ADDRCACHE

const uint64_t RANDOMIZER_ID_ADDRCACHE = 0x1cf2e4ddd306dda9ULL

static

Definition at line 109 of file net.cpp.

RANDOMIZER_ID_LOCALHOSTNONCE

const uint64_t RANDOMIZER_ID_LOCALHOSTNONCE = 0xd93e69e2bbfa5735ULL

static

Definition at line 108 of file net.cpp.

RANDOMIZER_ID_NETGROUP

const uint64_t RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL

static

Definition at line 107 of file net.cpp.

SELECT_TIMEOUT_MILLISECONDS

const uint64_t SELECT_TIMEOUT_MILLISECONDS = 50

static

Definition at line 103 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.