Bitcoin Core  21.99.0
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CAddrMan Class Reference

Stochastical (IP) address manager. More...

#include <addrman.h>

Collaboration diagram for CAddrMan:
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Public Member Functions

template<typename Stream >
void Serialize (Stream &s_) const
 Serialized format. More...
 
template<typename Stream >
void Unserialize (Stream &s_)
 
void Clear ()
 
 CAddrMan ()
 
 ~CAddrMan ()
 
size_t size () const
 Return the number of (unique) addresses in all tables. More...
 
void Check ()
 Consistency check. More...
 
bool Add (const CAddress &addr, const CNetAddr &source, int64_t nTimePenalty=0)
 Add a single address. More...
 
bool Add (const std::vector< CAddress > &vAddr, const CNetAddr &source, int64_t nTimePenalty=0)
 Add multiple addresses. More...
 
void Good (const CService &addr, bool test_before_evict=true, int64_t nTime=GetAdjustedTime())
 Mark an entry as accessible. More...
 
void Attempt (const CService &addr, bool fCountFailure, int64_t nTime=GetAdjustedTime())
 Mark an entry as connection attempted to. More...
 
void ResolveCollisions ()
 See if any to-be-evicted tried table entries have been tested and if so resolve the collisions. More...
 
CAddrInfo SelectTriedCollision ()
 Randomly select an address in tried that another address is attempting to evict. More...
 
CAddrInfo Select (bool newOnly=false)
 Choose an address to connect to. More...
 
std::vector< CAddressGetAddr (size_t max_addresses, size_t max_pct)
 Return a bunch of addresses, selected at random. More...
 
void Connected (const CService &addr, int64_t nTime=GetAdjustedTime())
 Outer function for Connected_() More...
 
void SetServices (const CService &addr, ServiceFlags nServices)
 

Static Public Member Functions

static std::vector< bool > DecodeAsmap (fs::path path)
 

Public Attributes

std::vector< bool > m_asmap
 

Protected Member Functions

CAddrInfoFind (const CNetAddr &addr, int *pnId=nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Find an entry. More...
 
CAddrInfoCreate (const CAddress &addr, const CNetAddr &addrSource, int *pnId=nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs)
 find an entry, creating it if necessary. More...
 
void SwapRandom (unsigned int nRandomPos1, unsigned int nRandomPos2) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Swap two elements in vRandom. More...
 
void MakeTried (CAddrInfo &info, int nId) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Move an entry from the "new" table(s) to the "tried" table. More...
 
void Delete (int nId) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Delete an entry. It must not be in tried, and have refcount 0. More...
 
void ClearNew (int nUBucket, int nUBucketPos) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Clear a position in a "new" table. This is the only place where entries are actually deleted. More...
 
void Good_ (const CService &addr, bool test_before_evict, int64_t time) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Mark an entry "good", possibly moving it from "new" to "tried". More...
 
bool Add_ (const CAddress &addr, const CNetAddr &source, int64_t nTimePenalty) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Add an entry to the "new" table. More...
 
void Attempt_ (const CService &addr, bool fCountFailure, int64_t nTime) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Mark an entry as attempted to connect. More...
 
CAddrInfo Select_ (bool newOnly) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Select an address to connect to, if newOnly is set to true, only the new table is selected from. More...
 
void ResolveCollisions_ () EXCLUSIVE_LOCKS_REQUIRED(cs)
 See if any to-be-evicted tried table entries have been tested and if so resolve the collisions. More...
 
CAddrInfo SelectTriedCollision_ () EXCLUSIVE_LOCKS_REQUIRED(cs)
 Return a random to-be-evicted tried table address. More...
 
void GetAddr_ (std::vector< CAddress > &vAddr, size_t max_addresses, size_t max_pct) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Select several addresses at once. More...
 
void Connected_ (const CService &addr, int64_t nTime) EXCLUSIVE_LOCKS_REQUIRED(cs)
 We have successfully connected to this peer. More...
 
void SetServices_ (const CService &addr, ServiceFlags nServices) EXCLUSIVE_LOCKS_REQUIRED(cs)
 Update an entry's service bits. More...
 

Protected Attributes

RecursiveMutex cs
 critical section to protect the inner data structures More...
 
uint256 nKey
 secret key to randomize bucket select with More...
 
FastRandomContext insecure_rand
 Source of random numbers for randomization in inner loops. More...
 

Private Types

enum  Format : uint8_t { V0_HISTORICAL = 0, V1_DETERMINISTIC = 1, V2_ASMAP = 2, V3_BIP155 = 3 }
 Serialization versions. More...
 

Private Member Functions

int nIdCount GUARDED_BY (cs)
 last used nId More...
 
std::map< int, CAddrInfo > mapInfo GUARDED_BY (cs)
 table with information about all nIds More...
 
std::map< CNetAddr, int > mapAddr GUARDED_BY (cs)
 find an nId based on its network address More...
 
std::vector< int > vRandom GUARDED_BY (cs)
 randomly-ordered vector of all nIds More...
 
int nTried GUARDED_BY (cs)
 
int vvTried[ADDRMAN_TRIED_BUCKET_COUNT][ADDRMAN_BUCKET_SIZEGUARDED_BY (cs)
 list of "tried" buckets More...
 
int nNew GUARDED_BY (cs)
 number of (unique) "new" entries More...
 
int vvNew[ADDRMAN_NEW_BUCKET_COUNT][ADDRMAN_BUCKET_SIZEGUARDED_BY (cs)
 list of "new" buckets More...
 
int64_t nLastGood GUARDED_BY (cs)
 last time Good was called (memory only) More...
 

Private Attributes

std::set< int > m_tried_collisions
 Holds addrs inserted into tried table that collide with existing entries. Test-before-evict discipline used to resolve these collisions. More...
 

Static Private Attributes

static constexpr Format FILE_FORMAT = Format::V3_BIP155
 The maximum format this software knows it can unserialize. More...
 
static constexpr uint8_t INCOMPATIBILITY_BASE = 32
 The initial value of a field that is incremented every time an incompatible format change is made (such that old software versions would not be able to parse and understand the new file format). More...
 

Friends

class CAddrManTest
 

Detailed Description

Stochastical (IP) address manager.

Definition at line 172 of file addrman.h.

Member Enumeration Documentation

◆ Format

enum CAddrMan::Format : uint8_t
private

Serialization versions.

Enumerator
V0_HISTORICAL 

historic format, before commit e6b343d88

V1_DETERMINISTIC 

for pre-asmap files

V2_ASMAP 

for files including asmap version

V3_BIP155 

same as V2_ASMAP plus addresses are in BIP155 format

Definition at line 181 of file addrman.h.

Constructor & Destructor Documentation

◆ CAddrMan()

CAddrMan::CAddrMan ( )
inline

Definition at line 604 of file addrman.h.

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◆ ~CAddrMan()

CAddrMan::~CAddrMan ( )
inline

Definition at line 609 of file addrman.h.

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Member Function Documentation

◆ Add() [1/2]

bool CAddrMan::Add ( const CAddress addr,
const CNetAddr source,
int64_t  nTimePenalty = 0 
)
inline

Add a single address.

Definition at line 635 of file addrman.h.

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◆ Add() [2/2]

bool CAddrMan::Add ( const std::vector< CAddress > &  vAddr,
const CNetAddr source,
int64_t  nTimePenalty = 0 
)
inline

Add multiple addresses.

Definition at line 649 of file addrman.h.

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◆ Add_()

bool CAddrMan::Add_ ( const CAddress addr,
const CNetAddr source,
int64_t  nTimePenalty 
)
protected

Add an entry to the "new" table.

Definition at line 264 of file addrman.cpp.

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◆ Attempt()

void CAddrMan::Attempt ( const CService addr,
bool  fCountFailure,
int64_t  nTime = GetAdjustedTime() 
)
inline

Mark an entry as connection attempted to.

Definition at line 673 of file addrman.h.

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◆ Attempt_()

void CAddrMan::Attempt_ ( const CService addr,
bool  fCountFailure,
int64_t  nTime 
)
protected

Mark an entry as attempted to connect.

Definition at line 337 of file addrman.cpp.

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◆ Check()

void CAddrMan::Check ( )
inline

Consistency check.

Definition at line 622 of file addrman.h.

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◆ Clear()

void CAddrMan::Clear ( )
inline

Definition at line 580 of file addrman.h.

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◆ ClearNew()

void CAddrMan::ClearNew ( int  nUBucket,
int  nUBucketPos 
)
protected

Clear a position in a "new" table. This is the only place where entries are actually deleted.

Definition at line 135 of file addrman.cpp.

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◆ Connected()

void CAddrMan::Connected ( const CService addr,
int64_t  nTime = GetAdjustedTime() 
)
inline

Outer function for Connected_()

Definition at line 732 of file addrman.h.

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◆ Connected_()

void CAddrMan::Connected_ ( const CService addr,
int64_t  nTime 
)
protected

We have successfully connected to this peer.

Calling this function updates the CAddress's nTime, which is used in our IsTerrible() decisions and gossiped to peers. Callers should be careful that updating this information doesn't leak topology information to network spies.

net_processing calls this function when it disconnects from a peer to not leak information about currently connected peers.

Parameters
[in]addrThe address of the peer we were connected to
[in]nTimeThe time that we were last connected to this peer

Definition at line 509 of file addrman.cpp.

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◆ Create()

CAddrInfo * CAddrMan::Create ( const CAddress addr,
const CNetAddr addrSource,
int *  pnId = nullptr 
)
protected

find an entry, creating it if necessary.

nTime and nServices of the found node are updated, if necessary.

Definition at line 89 of file addrman.cpp.

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◆ DecodeAsmap()

std::vector< bool > CAddrMan::DecodeAsmap ( fs::path  path)
static

Definition at line 633 of file addrman.cpp.

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◆ Delete()

void CAddrMan::Delete ( int  nId)
protected

Delete an entry. It must not be in tried, and have refcount 0.

Definition at line 121 of file addrman.cpp.

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◆ Find()

CAddrInfo * CAddrMan::Find ( const CNetAddr addr,
int *  pnId = nullptr 
)
protected

Find an entry.

Definition at line 76 of file addrman.cpp.

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◆ GetAddr()

std::vector<CAddress> CAddrMan::GetAddr ( size_t  max_addresses,
size_t  max_pct 
)
inline

Return a bunch of addresses, selected at random.

Definition at line 719 of file addrman.h.

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◆ GetAddr_()

void CAddrMan::GetAddr_ ( std::vector< CAddress > &  vAddr,
size_t  max_addresses,
size_t  max_pct 
)
protected

Select several addresses at once.

Definition at line 484 of file addrman.cpp.

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◆ Good()

void CAddrMan::Good ( const CService addr,
bool  test_before_evict = true,
int64_t  nTime = GetAdjustedTime() 
)
inline

Mark an entry as accessible.

Definition at line 664 of file addrman.h.

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◆ Good_()

void CAddrMan::Good_ ( const CService addr,
bool  test_before_evict,
int64_t  time 
)
protected

Mark an entry "good", possibly moving it from "new" to "tried".

Definition at line 198 of file addrman.cpp.

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◆ GUARDED_BY() [1/9]

int nIdCount CAddrMan::GUARDED_BY ( cs  )
private

last used nId

◆ GUARDED_BY() [2/9]

std::map<int, CAddrInfo> mapInfo CAddrMan::GUARDED_BY ( cs  )
private

table with information about all nIds

◆ GUARDED_BY() [3/9]

std::map<CNetAddr, int> mapAddr CAddrMan::GUARDED_BY ( cs  )
private

find an nId based on its network address

◆ GUARDED_BY() [4/9]

std::vector<int> vRandom CAddrMan::GUARDED_BY ( cs  )
private

randomly-ordered vector of all nIds

◆ GUARDED_BY() [5/9]

int nTried CAddrMan::GUARDED_BY ( cs  )
private

◆ GUARDED_BY() [6/9]

int vvTried [ADDRMAN_TRIED_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE] CAddrMan::GUARDED_BY ( cs  )
private

list of "tried" buckets

◆ GUARDED_BY() [7/9]

int nNew CAddrMan::GUARDED_BY ( cs  )
private

number of (unique) "new" entries

◆ GUARDED_BY() [8/9]

int vvNew [ADDRMAN_NEW_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE] CAddrMan::GUARDED_BY ( cs  )
private

list of "new" buckets

◆ GUARDED_BY() [9/9]

int64_t nLastGood CAddrMan::GUARDED_BY ( cs  )
private

last time Good was called (memory only)

◆ MakeTried()

void CAddrMan::MakeTried ( CAddrInfo info,
int  nId 
)
protected

Move an entry from the "new" table(s) to the "tried" table.

Definition at line 150 of file addrman.cpp.

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◆ ResolveCollisions()

void CAddrMan::ResolveCollisions ( )
inline

See if any to-be-evicted tried table entries have been tested and if so resolve the collisions.

Definition at line 682 of file addrman.h.

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◆ ResolveCollisions_()

void CAddrMan::ResolveCollisions_ ( )
protected

See if any to-be-evicted tried table entries have been tested and if so resolve the collisions.

Definition at line 547 of file addrman.cpp.

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◆ Select()

CAddrInfo CAddrMan::Select ( bool  newOnly = false)
inline

Choose an address to connect to.

Definition at line 706 of file addrman.h.

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◆ Select_()

CAddrInfo CAddrMan::Select_ ( bool  newOnly)
protected

Select an address to connect to, if newOnly is set to true, only the new table is selected from.

Definition at line 359 of file addrman.cpp.

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◆ SelectTriedCollision()

CAddrInfo CAddrMan::SelectTriedCollision ( )
inline

Randomly select an address in tried that another address is attempting to evict.

Definition at line 691 of file addrman.h.

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◆ SelectTriedCollision_()

CAddrInfo CAddrMan::SelectTriedCollision_ ( )
protected

Return a random to-be-evicted tried table address.

Definition at line 606 of file addrman.cpp.

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◆ Serialize()

template<typename Stream >
void CAddrMan::Serialize ( Stream &  s_) const
inline

Serialized format.

  • format version byte (
    See also
    Format)
  • lowest compatible format version byte. This is used to help old software decide whether to parse the file. For example:
    • Bitcoin Core version N knows how to parse up to format=3. If a new format=4 is introduced in version N+1 that is compatible with format=3 and it is known that version N will be able to parse it, then version N+1 will write (format=4, lowest_compatible=3) in the first two bytes of the file, and so version N will still try to parse it.
    • Bitcoin Core version N+2 introduces a new incompatible format=5. It will write (format=5, lowest_compatible=5) and so any versions that do not know how to parse format=5 will not try to read the file.
  • nKey
  • nNew
  • nTried
  • number of "new" buckets XOR 2**30
  • all new addresses (total count: nNew)
  • all tried addresses (total count: nTried)
  • for each new bucket:
    • number of elements
    • for each element: index in the serialized "all new addresses"
  • asmap checksum

2**30 is xorred with the number of buckets to make addrman deserializer v0 detect it as incompatible. This is necessary because it did not check the version number on deserialization.

vvNew, vvTried, mapInfo, mapAddr and vRandom are never encoded explicitly; they are instead reconstructed from the other information.

This format is more complex, but significantly smaller (at most 1.5 MiB), and supports changes to the ADDRMAN_ parameters without breaking the on-disk structure.

We don't use SERIALIZE_METHODS since the serialization and deserialization code has very little in common.

Definition at line 359 of file addrman.h.

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◆ SetServices()

void CAddrMan::SetServices ( const CService addr,
ServiceFlags  nServices 
)
inline

Definition at line 740 of file addrman.h.

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◆ SetServices_()

void CAddrMan::SetServices_ ( const CService addr,
ServiceFlags  nServices 
)
protected

Update an entry's service bits.

Definition at line 529 of file addrman.cpp.

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◆ size()

size_t CAddrMan::size ( ) const
inline

Return the number of (unique) addresses in all tables.

Definition at line 615 of file addrman.h.

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◆ SwapRandom()

void CAddrMan::SwapRandom ( unsigned int  nRandomPos1,
unsigned int  nRandomPos2 
)
protected

Swap two elements in vRandom.

Definition at line 101 of file addrman.cpp.

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◆ Unserialize()

template<typename Stream >
void CAddrMan::Unserialize ( Stream &  s_)
inline

Definition at line 424 of file addrman.h.

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Friends And Related Function Documentation

◆ CAddrManTest

friend class CAddrManTest
friend

Definition at line 174 of file addrman.h.

Member Data Documentation

◆ cs

RecursiveMutex CAddrMan::cs
mutableprotected

critical section to protect the inner data structures

Definition at line 177 of file addrman.h.

◆ FILE_FORMAT

constexpr Format CAddrMan::FILE_FORMAT = Format::V3_BIP155
staticconstexprprivate

The maximum format this software knows it can unserialize.

Also, we always serialize in this format. The format (first byte in the serialized stream) can be higher than this and still this software may be able to unserialize the file - if the second byte (see lowest_compatible in Unserialize()) is less or equal to this.

Definition at line 193 of file addrman.h.

◆ INCOMPATIBILITY_BASE

constexpr uint8_t CAddrMan::INCOMPATIBILITY_BASE = 32
staticconstexprprivate

The initial value of a field that is incremented every time an incompatible format change is made (such that old software versions would not be able to parse and understand the new file format).

This is 32 because we overtook the "key size" field which was 32 historically.

Note
Don't increment this. Increment lowest_compatible in Serialize() instead.

Definition at line 200 of file addrman.h.

◆ insecure_rand

FastRandomContext CAddrMan::insecure_rand
protected

Source of random numbers for randomization in inner loops.

Definition at line 237 of file addrman.h.

◆ m_asmap

std::vector<bool> CAddrMan::m_asmap

Definition at line 315 of file addrman.h.

◆ m_tried_collisions

std::set<int> CAddrMan::m_tried_collisions
private

Holds addrs inserted into tried table that collide with existing entries. Test-before-evict discipline used to resolve these collisions.

Definition at line 230 of file addrman.h.

◆ nKey

uint256 CAddrMan::nKey
protected

secret key to randomize bucket select with

Definition at line 234 of file addrman.h.


The documentation for this class was generated from the following files: