Bitcoin Core  0.20.99
P2P Digital Currency
Classes | Macros | Enumerations | Functions | Variables
net.cpp File Reference
#include <net.h>
#include <banman.h>
#include <clientversion.h>
#include <consensus/consensus.h>
#include <crypto/sha256.h>
#include <net_permissions.h>
#include <netbase.h>
#include <node/ui_interface.h>
#include <protocol.h>
#include <random.h>
#include <scheduler.h>
#include <util/strencodings.h>
#include <util/translation.h>
#include <fcntl.h>
#include <algorithm>
#include <cstdint>
#include <unordered_map>
#include <math.h>
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Classes

struct  NodeEvictionCandidate
 
class  CNetCleanup
 

Macros

#define FEELER_SLEEP_WINDOW   1
 
#define MSG_NOSIGNAL   0
 
#define MSG_DONTWAIT   0
 
#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< CAddressconvertSeed6 (const std::vector< SeedSpec6 > &vSeedsIn)
 Convert the pnSeed6 array into usable address objects. More...
 
CAddress GetLocalAddress (const CNetAddr *paddrPeer, ServiceFlags nLocalServices)
 
static int GetnScore (const CService &addr)
 
bool IsPeerAddrLocalGood (CNode *pnode)
 
void AdvertiseLocal (CNode *pnode)
 
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...
 
static bool ReverseCompareNodeMinPingTime (const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
 
static bool ReverseCompareNodeTimeConnected (const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
 
static bool CompareLocalHostTimeConnected (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)
 Sort an array by the specified comparator, then erase the last K elements. More...
 
void StartMapPort ()
 
void InterruptMapPort ()
 
void StopMapPort ()
 
void Discover ()
 
int64_t PoissonNextSend (int64_t now, int average_interval_seconds)
 Return a timestamp in the future (in microseconds) for exponentially distributed events. 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 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
 
bool g_relay_txes = !DEFAULT_BLOCKSONLY
 
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 76 of file net.cpp.

◆ MSG_DONTWAIT

#define MSG_DONTWAIT   0

Definition at line 85 of file net.cpp.

◆ MSG_NOSIGNAL

#define MSG_NOSIGNAL   0

Definition at line 80 of file net.cpp.

◆ X

#define X (   name)    stats.name = name

Definition at line 554 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 CService addr,
int  nScore 
)

Definition at line 236 of file net.cpp.

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◆ AddLocal() [2/2]

bool AddLocal ( const CNetAddr addr,
int  nScore 
)

Definition at line 262 of file net.cpp.

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◆ AdvertiseLocal()

void AdvertiseLocal ( CNode pnode)

Definition at line 209 of file net.cpp.

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◆ CompareLocalHostTimeConnected()

static bool CompareLocalHostTimeConnected ( const NodeEvictionCandidate a,
const NodeEvictionCandidate b 
)
static

Definition at line 877 of file net.cpp.

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◆ CompareNetGroupKeyed()

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

Definition at line 883 of file net.cpp.

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◆ CompareNodeBlockRelayOnlyTime()

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

Definition at line 905 of file net.cpp.

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◆ CompareNodeBlockTime()

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

Definition at line 887 of file net.cpp.

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◆ CompareNodeTXTime()

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

Definition at line 895 of file net.cpp.

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◆ convertSeed6()

static std::vector<CAddress> convertSeed6 ( const std::vector< SeedSpec6 > &  vSeedsIn)
static

Convert the pnSeed6 array into usable address objects.

Definition at line 157 of file net.cpp.

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◆ Discover()

void Discover ( )

Definition at line 2296 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 
)
static

Sort an array by the specified comparator, then erase the last K elements.

Definition at line 915 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 368 of file net.cpp.

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◆ GetListenPort()

uint16_t GetListenPort ( )

Definition at line 126 of file net.cpp.

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◆ GetLocal()

bool GetLocal ( CService addr,
const CNetAddr paddrPeer 
)

Definition at line 132 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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◆ 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  )

◆ InterruptMapPort()

void InterruptMapPort ( )

Definition at line 1668 of file net.cpp.

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◆ IsLocal()

bool IsLocal ( const CService addr)

check whether a given address is potentially local

Definition at line 307 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 ( enum Network  net)
Returns
true if the network is reachable, false otherwise

Definition at line 282 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 288 of file net.cpp.

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◆ PoissonNextSend()

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 3031 of file net.cpp.

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◆ RemoveLocal()

void RemoveLocal ( const CService addr)

Definition at line 267 of file net.cpp.

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◆ ReverseCompareNodeMinPingTime()

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

Definition at line 867 of file net.cpp.

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◆ ReverseCompareNodeTimeConnected()

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

Definition at line 872 of file net.cpp.

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◆ SeenLocal()

bool SeenLocal ( const CService addr)

vote for a local address

Definition at line 294 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 274 of file net.cpp.

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◆ StartMapPort()

void StartMapPort ( )

Definition at line 1664 of file net.cpp.

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◆ StopMapPort()

void StopMapPort ( )

Definition at line 1672 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 54 of file net.cpp.

◆ cs_mapLocalHost

RecursiveMutex cs_mapLocalHost

Definition at line 115 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 71 of file net.cpp.

◆ DNSSEEDS_DELAY_MANY_PEERS

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

Definition at line 72 of file net.cpp.

◆ DNSSEEDS_DELAY_PEER_THRESHOLD

constexpr int DNSSEEDS_DELAY_PEER_THRESHOLD = 1000
static

Definition at line 73 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 60 of file net.cpp.

◆ DUMP_PEERS_INTERVAL

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

Definition at line 57 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.

◆ g_relay_txes

bool g_relay_txes = !DEFAULT_BLOCKSONLY

Definition at line 114 of file net.cpp.

◆ instance_of_cnetcleanup

CNetCleanup instance_of_cnetcleanup
static

Definition at line 2544 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 51 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 118 of file net.cpp.