Bitcoin Core  22.99.0
P2P Digital Currency
Classes | Macros | Enumerations | Functions | Variables
net.cpp File Reference
#include <net.h>
#include <addrdb.h>
#include <addrman.h>
#include <banman.h>
#include <clientversion.h>
#include <compat.h>
#include <consensus/consensus.h>
#include <crypto/sha256.h>
#include <fs.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>
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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 (g_maplocalhost_mutex)
 
uint16_t GetListenPort ()
 
bool GetLocal (CService &addr, const CNetAddr *paddrPeer)
 
static std::vector< CAddressConvertSeeds (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< CAddressGetLocalAddrForPeer (CNode *pnode)
 Returns a local address that we should advertise to this peer. More...
 
CService MaybeFlipIPv6toCJDNS (const CService &service)
 If an IPv6 address belongs to the address range used by the CJDNS network and the CJDNS network is reachable (-cjdnsreachable config is set), then change the type from NET_IPV6 to NET_CJDNS. 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< NodeIdSelectNodeToEvict (std::vector< NodeEvictionCandidate > &&vEvictionCandidates)
 Select an inbound peer to evict after filtering out (protecting) peers having distinct, difficult-to-forge characteristics. More...
 
void Discover ()
 
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
 
Mutex g_maplocalhost_mutex
 
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 88 of file net.cpp.

◆ X

#define X (   name)    stats.name = name

Definition at line 586 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 91 of file net.cpp.

Function Documentation

◆ AddLocal() [1/2]

bool AddLocal ( const CNetAddr addr,
int  nScore 
)

Definition at line 280 of file net.cpp.

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◆ AddLocal() [2/2]

bool AddLocal ( const CService addr_,
int  nScore 
)

Definition at line 252 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 3092 of file net.cpp.

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◆ CompareNetGroupKeyed()

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

Definition at line 865 of file net.cpp.

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◆ CompareNodeBlockRelayOnlyTime()

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

Definition at line 887 of file net.cpp.

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◆ CompareNodeBlockTime()

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

Definition at line 869 of file net.cpp.

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◆ CompareNodeTXTime()

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

Definition at line 877 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 543 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 158 of file net.cpp.

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◆ Discover()

void Discover ( )

Definition at line 2423 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 917 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 389 of file net.cpp.

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◆ GetListenPort()

uint16_t GetListenPort ( )

Definition at line 127 of file net.cpp.

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◆ GetLocal()

bool GetLocal ( CService addr,
const CNetAddr paddrPeer 
)

Definition at line 133 of file net.cpp.

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◆ GetLocalAddress()

CAddress GetLocalAddress ( const CNetAddr paddrPeer,
ServiceFlags  nLocalServices 
)

Definition at line 183 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 210 of file net.cpp.

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◆ GetnScore()

static int GetnScore ( const CService addr)
static

Definition at line 195 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 323 of file net.cpp.

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◆ IsPeerAddrLocalGood()

bool IsPeerAddrLocalGood ( CNode pnode)

Definition at line 203 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 306 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 300 of file net.cpp.

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◆ MaybeFlipIPv6toCJDNS()

CService MaybeFlipIPv6toCJDNS ( const CService service)

If an IPv6 address belongs to the address range used by the CJDNS network and the CJDNS network is reachable (-cjdnsreachable config is set), then change the type from NET_IPV6 to NET_CJDNS.

Parameters
[in]serviceAddress to potentially convert.
Returns
a copy of service either unmodified or changed to CJDNS.

Definition at line 242 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 926 of file net.cpp.

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◆ RemoveLocal()

void RemoveLocal ( const CService addr)

Definition at line 285 of file net.cpp.

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◆ ReverseCompareNodeMinPingTime()

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

Definition at line 855 of file net.cpp.

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◆ ReverseCompareNodeTimeConnected()

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

Definition at line 860 of file net.cpp.

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◆ SeenLocal()

bool SeenLocal ( const CService addr)

vote for a local address

Definition at line 312 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 999 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 292 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 63 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 80 of file net.cpp.

◆ DNSSEEDS_DELAY_MANY_PEERS

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

Definition at line 81 of file net.cpp.

◆ DNSSEEDS_DELAY_PEER_THRESHOLD

constexpr int DNSSEEDS_DELAY_PEER_THRESHOLD = 1000
staticconstexpr

Definition at line 82 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 69 of file net.cpp.

◆ DUMP_PEERS_INTERVAL

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

Definition at line 66 of file net.cpp.

◆ fDiscover

bool fDiscover = true

Definition at line 114 of file net.cpp.

◆ fListen

bool fListen = true

Definition at line 115 of file net.cpp.

◆ g_maplocalhost_mutex

Mutex g_maplocalhost_mutex

Definition at line 116 of file net.cpp.

◆ instance_of_cnetcleanup

CNetCleanup instance_of_cnetcleanup
static

Definition at line 2661 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 60 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 85 of file net.cpp.

◆ NET_MESSAGE_COMMAND_OTHER

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

Definition at line 106 of file net.cpp.

◆ RANDOMIZER_ID_ADDRCACHE

const uint64_t RANDOMIZER_ID_ADDRCACHE = 0x1cf2e4ddd306dda9ULL
static

Definition at line 110 of file net.cpp.

◆ RANDOMIZER_ID_LOCALHOSTNONCE

const uint64_t RANDOMIZER_ID_LOCALHOSTNONCE = 0xd93e69e2bbfa5735ULL
static

Definition at line 109 of file net.cpp.

◆ RANDOMIZER_ID_NETGROUP

const uint64_t RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL
static

Definition at line 108 of file net.cpp.

◆ SELECT_TIMEOUT_MILLISECONDS

const uint64_t SELECT_TIMEOUT_MILLISECONDS = 50
static

Definition at line 104 of file net.cpp.

◆ strSubVersion

std::string strSubVersion

Subversion as sent to the P2P network in version messages.

Definition at line 119 of file net.cpp.