Bitcoin Core  0.20.99
P2P Digital Currency
Classes | Typedefs | Enumerations | Functions | Variables
net.h File Reference
#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 <atomic>
#include <cstdint>
#include <deque>
#include <map>
#include <thread>
#include <memory>
#include <condition_variable>
#include <arpa/inet.h>
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Classes

struct  AddedNodeInfo
 
struct  CSerializedNetMsg
 
class  CConnman
 
struct  CConnman::Options
 
struct  CConnman::ListenSocket
 
struct  CConnman::CachedAddrResponse
 Cache responses to addr requests to minimize privacy leak. More...
 
class  NetEventsInterface
 Interface for message handling. More...
 
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
 

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_UPNP,
  LOCAL_MANUAL, LOCAL_MAX
}
 

Functions

void Discover ()
 
void StartMapPort ()
 
void InterruptMapPort ()
 
void StopMapPort ()
 
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...
 

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 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 bool DEFAULT_UPNP = false
 -upnp default More...
 
static const unsigned int DEFAULT_MAX_PEER_CONNECTIONS = 125
 The maximum number of peer connections to maintain. More...
 
static const uint64_t DEFAULT_MAX_UPLOAD_TARGET = 0
 The default for -maxuploadtarget. More...
 
static const uint64_t MAX_UPLOAD_TIMEFRAME = 60 * 60 * 24
 The default timeframe 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
 
bool g_relay_txes
 
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 680 of file net.h.

◆ NodeId

typedef int64_t NodeId

Definition at line 92 of file net.h.

Enumeration Type Documentation

◆ anonymous enum

anonymous enum
Enumerator
LOCAL_NONE 
LOCAL_IF 
LOCAL_BIND 
LOCAL_UPNP 
LOCAL_MANUAL 
LOCAL_MAX 

Definition at line 631 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 124 of file net.h.

Function Documentation

◆ AddLocal() [1/2]

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

Definition at line 236 of file net.cpp.

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◆ AddLocal() [2/2]

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

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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◆ Discover()

void Discover ( )

Definition at line 2296 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 = nullptr 
)

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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◆ GUARDED_BY()

std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY ( cs_mapLocalHost  )
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◆ 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() [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 3031 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 1207 of file net.h.

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◆ RemoveLocal()

void RemoveLocal ( const CService addr)

Definition at line 267 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

◆ cs_mapLocalHost

RecursiveMutex cs_mapLocalHost

Definition at line 115 of file net.cpp.

◆ DEFAULT_BLOCKSONLY

const bool DEFAULT_BLOCKSONLY = false
static

Default for blocks only.

Definition at line 84 of file net.h.

◆ DEFAULT_FORCEDNSSEED

const bool DEFAULT_FORCEDNSSEED = false
static

Definition at line 88 of file net.h.

◆ DEFAULT_LISTEN

const bool DEFAULT_LISTEN = true
static

-listen default

Definition at line 70 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 78 of file net.h.

◆ DEFAULT_MAX_UPLOAD_TARGET

const uint64_t DEFAULT_MAX_UPLOAD_TARGET = 0
static

The default for -maxuploadtarget.

0 = Unlimited

Definition at line 80 of file net.h.

◆ DEFAULT_MAXRECEIVEBUFFER

const size_t DEFAULT_MAXRECEIVEBUFFER = 5 * 1000
static

Definition at line 89 of file net.h.

◆ DEFAULT_MAXSENDBUFFER

const size_t DEFAULT_MAXSENDBUFFER = 1 * 1000
static

Definition at line 90 of file net.h.

◆ DEFAULT_PEER_CONNECT_TIMEOUT

const int64_t DEFAULT_PEER_CONNECT_TIMEOUT = 60
static

-peertimeout default

Definition at line 86 of file net.h.

◆ DEFAULT_UPNP

const bool DEFAULT_UPNP = false
static

-upnp default

Definition at line 75 of file net.h.

◆ DEFAULT_WHITELISTFORCERELAY

const bool DEFAULT_WHITELISTFORCERELAY = false
static

Default for -whitelistforcerelay.

Definition at line 49 of file net.h.

◆ DEFAULT_WHITELISTRELAY

const bool DEFAULT_WHITELISTRELAY = true
static

Default for -whitelistrelay.

Definition at line 47 of file net.h.

◆ fDiscover

bool fDiscover

Definition at line 112 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 54 of file net.h.

◆ fListen

bool fListen

Definition at line 113 of file net.cpp.

◆ g_relay_txes

bool g_relay_txes

Definition at line 114 of file net.cpp.

◆ MAX_ADDNODE_CONNECTIONS

const int MAX_ADDNODE_CONNECTIONS = 8
static

Maximum number of addnode outgoing nodes.

Definition at line 64 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 56 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 66 of file net.h.

◆ MAX_FEELER_CONNECTIONS

const int MAX_FEELER_CONNECTIONS = 1
static

Maximum number of feeler connections.

Definition at line 68 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 62 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 58 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 60 of file net.h.

◆ MAX_UPLOAD_TIMEFRAME

const uint64_t MAX_UPLOAD_TIMEFRAME = 60 * 60 * 24
static

The default timeframe for -maxuploadtarget.

1 day.

Definition at line 82 of file net.h.

◆ NET_MESSAGE_COMMAND_OTHER

const std::string NET_MESSAGE_COMMAND_OTHER

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 118 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 52 of file net.h.