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Make addrman's bucket placement deterministic.

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Give each address a single fixed location in the new and tried tables,
which become simple fixed-size arrays instead of sets and vectors.

This prevents attackers from having an advantages by inserting an
address multiple times.

This change was suggested as Countermeasure 1 in
Eclipse Attacks on Bitcoin’s Peer-to-Peer Network, Ethan Heilman,
Alison Kendler, Aviv Zohar, Sharon Goldberg. ePrint Archive Report
2015/263. March 2015.

It is also more efficient.
pull/262/head
Pieter Wuille 10 years ago
parent b23add5521
commit e6b343d880
2 changed files with 231 additions and 206 deletions
Show Stats Download Patch File Download Diff File

246
src/addrman.cpp
Unescape View File

@ -14,12 +14,12 @@ int CAddrInfo::GetTriedBucket(const uint256& nKey) const
{
CDataStream ss1(SER_GETHASH, 0);
std::vector<unsigned char> vchKey = GetKey();
ss1 << ((unsigned char)32) << nKey << vchKey;
ss1 << nKey << vchKey;
uint64_t hash1 = Hash(ss1.begin(), ss1.end()).GetCheapHash();
CDataStream ss2(SER_GETHASH, 0);
std::vector<unsigned char> vchGroupKey = GetGroup();
ss2 << ((unsigned char)32) << nKey << vchGroupKey << (hash1 % ADDRMAN_TRIED_BUCKETS_PER_GROUP);
ss2 << nKey << vchGroupKey << (hash1 % ADDRMAN_TRIED_BUCKETS_PER_GROUP);
uint64_t hash2 = Hash(ss2.begin(), ss2.end()).GetCheapHash();
return hash2 % ADDRMAN_TRIED_BUCKET_COUNT;
}
@ -29,15 +29,24 @@ int CAddrInfo::GetNewBucket(const uint256& nKey, const CNetAddr& src) const
CDataStream ss1(SER_GETHASH, 0);
std::vector<unsigned char> vchGroupKey = GetGroup();
std::vector<unsigned char> vchSourceGroupKey = src.GetGroup();
ss1 << ((unsigned char)32) << nKey << vchGroupKey << vchSourceGroupKey;
ss1 << nKey << vchGroupKey << vchSourceGroupKey;
uint64_t hash1 = Hash(ss1.begin(), ss1.end()).GetCheapHash();
CDataStream ss2(SER_GETHASH, 0);
ss2 << ((unsigned char)32) << nKey << vchSourceGroupKey << (hash1 % ADDRMAN_NEW_BUCKETS_PER_SOURCE_GROUP);
ss2 << nKey << vchSourceGroupKey << (hash1 % ADDRMAN_NEW_BUCKETS_PER_SOURCE_GROUP);
uint64_t hash2 = Hash(ss2.begin(), ss2.end()).GetCheapHash();
return hash2 % ADDRMAN_NEW_BUCKET_COUNT;
}
int CAddrInfo::GetBucketPosition(const uint256 &nKey, bool fNew, int nBucket) const
{
CDataStream ss1(SER_GETHASH, 0);
std::vector<unsigned char> vchKey = GetKey();
ss1 << nKey << (fNew ? 'N' : 'K') << nBucket << vchKey;
uint64_t hash1 = Hash(ss1.begin(), ss1.end()).GetCheapHash();
return hash1 % ADDRMAN_BUCKET_SIZE;
}
bool CAddrInfo::IsTerrible(int64_t nNow) const
{
if (nLastTry && nLastTry >= nNow - 60) // never remove things tried in the last minute
@ -128,130 +137,81 @@ void CAddrMan::SwapRandom(unsigned int nRndPos1, unsigned int nRndPos2)
vRandom[nRndPos2] = nId1;
}
int CAddrMan::SelectTried(int nKBucket)
void CAddrMan::Delete(int nId)
{
std::vector<int>& vTried = vvTried[nKBucket];
// randomly shuffle the first few elements (using the entire list)
// find the least recently tried among them
int64_t nOldest = -1;
int nOldestPos = -1;
for (unsigned int i = 0; i < ADDRMAN_TRIED_ENTRIES_INSPECT_ON_EVICT && i < vTried.size(); i++) {
int nPos = GetRandInt(vTried.size() - i) + i;
int nTemp = vTried[nPos];
vTried[nPos] = vTried[i];
vTried[i] = nTemp;
assert(nOldest == -1 || mapInfo.count(nTemp) == 1);
if (nOldest == -1 || mapInfo[nTemp].nLastSuccess < mapInfo[nOldest].nLastSuccess) {
nOldest = nTemp;
nOldestPos = nPos;
}
}
return nOldestPos;
}
assert(mapInfo.count(nId) != 0);
CAddrInfo& info = mapInfo[nId];
assert(!info.fInTried);
assert(info.nRefCount == 0);
int CAddrMan::ShrinkNew(int nUBucket)
{
assert(nUBucket >= 0 && (unsigned int)nUBucket < vvNew.size());
std::set<int>& vNew = vvNew[nUBucket];
// first look for deletable items
for (std::set<int>::iterator it = vNew.begin(); it != vNew.end(); it++) {
assert(mapInfo.count(*it));
CAddrInfo& info = mapInfo[*it];
if (info.IsTerrible()) {
if (--info.nRefCount == 0) {
SwapRandom(info.nRandomPos, vRandom.size() - 1);
vRandom.pop_back();
mapAddr.erase(info);
mapInfo.erase(*it);
mapInfo.erase(nId);
nNew--;
}
vNew.erase(it);
return 0;
}
}
// otherwise, select four randomly, and pick the oldest of those to replace
int n[4] = {GetRandInt(vNew.size()), GetRandInt(vNew.size()), GetRandInt(vNew.size()), GetRandInt(vNew.size())};
int nI = 0;
int nOldest = -1;
for (std::set<int>::iterator it = vNew.begin(); it != vNew.end(); it++) {
if (nI == n[0] || nI == n[1] || nI == n[2] || nI == n[3]) {
assert(nOldest == -1 || mapInfo.count(*it) == 1);
if (nOldest == -1 || mapInfo[*it].nTime < mapInfo[nOldest].nTime)
nOldest = *it;
}
nI++;
void CAddrMan::ClearNew(int nUBucket, int nUBucketPos)
{
// if there is an entry in the specified bucket, delete it.
if (vvNew[nUBucket][nUBucketPos] != -1) {
int nIdDelete = vvNew[nUBucket][nUBucketPos];
CAddrInfo& infoDelete = mapInfo[nIdDelete];
assert(infoDelete.nRefCount > 0);
infoDelete.nRefCount--;
vvNew[nUBucket][nUBucketPos] = -1;
if (infoDelete.nRefCount == 0) {
Delete(nIdDelete);
}
assert(mapInfo.count(nOldest) == 1);
CAddrInfo& info = mapInfo[nOldest];
if (--info.nRefCount == 0) {
SwapRandom(info.nRandomPos, vRandom.size() - 1);
vRandom.pop_back();
mapAddr.erase(info);
mapInfo.erase(nOldest);
nNew--;
}
vNew.erase(nOldest);
return 1;
}
void CAddrMan::MakeTried(CAddrInfo& info, int nId, int nOrigin)
void CAddrMan::MakeTried(CAddrInfo& info, int nId)
{
assert(vvNew[nOrigin].count(nId) == 1);
// remove the entry from all new buckets
for (std::vector<std::set<int> >::iterator it = vvNew.begin(); it != vvNew.end(); it++) {
if ((*it).erase(nId))
for (int bucket = 0; bucket < ADDRMAN_NEW_BUCKET_COUNT; bucket++) {
int pos = info.GetBucketPosition(nKey, true, bucket);
if (vvNew[bucket][pos] == nId) {
vvNew[bucket][pos] = -1;
info.nRefCount--;
}
}
nNew--;
assert(info.nRefCount == 0);
// which tried bucket to move the entry to
int nKBucket = info.GetTriedBucket(nKey);
std::vector<int>& vTried = vvTried[nKBucket];
int nKBucketPos = info.GetBucketPosition(nKey, false, nKBucket);
// first check whether there is place to just add it
if (vTried.size() < ADDRMAN_TRIED_BUCKET_SIZE) {
vTried.push_back(nId);
nTried++;
info.fInTried = true;
return;
}
// first make space to add it (the existing tried entry there is moved to new, deleting whatever is there).
if (vvTried[nKBucket][nKBucketPos] != -1) {
// find an item to evict
int nIdEvict = vvTried[nKBucket][nKBucketPos];
assert(mapInfo.count(nIdEvict) == 1);
CAddrInfo& infoOld = mapInfo[nIdEvict];
// otherwise, find an item to evict
int nPos = SelectTried(nKBucket);
// Remove the to-be-evicted item from the tried set.
infoOld.fInTried = false;
vvTried[nKBucket][nKBucketPos] = -1;
nTried--;
// find which new bucket it belongs to
assert(mapInfo.count(vTried[nPos]) == 1);
int nUBucket = mapInfo[vTried[nPos]].GetNewBucket(nKey);
std::set<int>& vNew = vvNew[nUBucket];
int nUBucket = infoOld.GetNewBucket(nKey);
int nUBucketPos = infoOld.GetBucketPosition(nKey, true, nUBucket);
ClearNew(nUBucket, nUBucketPos);
assert(vvNew[nUBucket][nUBucketPos] == -1);
// remove the to-be-replaced tried entry from the tried set
CAddrInfo& infoOld = mapInfo[vTried[nPos]];
infoOld.fInTried = false;
// Enter it into the new set again.
infoOld.nRefCount = 1;
// do not update nTried, as we are going to move something else there immediately
// check whether there is place in that one,
if (vNew.size() < ADDRMAN_NEW_BUCKET_SIZE) {
// if so, move it back there
vNew.insert(vTried[nPos]);
} else {
// otherwise, move it to the new bucket nId came from (there is certainly place there)
vvNew[nOrigin].insert(vTried[nPos]);
}
vvNew[nUBucket][nUBucketPos] = nIdEvict;
nNew++;
}
assert(vvTried[nKBucket][nKBucketPos] == -1);
vTried[nPos] = nId;
// we just overwrote an entry in vTried; no need to update nTried
vvTried[nKBucket][nKBucketPos] = nId;
nTried++;
info.fInTried = true;
return;
}
void CAddrMan::Good_(const CService& addr, int64_t nTime)
@ -281,12 +241,12 @@ void CAddrMan::Good_(const CService& addr, int64_t nTime)
return;
// find a bucket it is in now
int nRnd = GetRandInt(vvNew.size());
int nRnd = GetRandInt(ADDRMAN_NEW_BUCKET_COUNT);
int nUBucket = -1;
for (unsigned int n = 0; n < vvNew.size(); n++) {
int nB = (n + nRnd) % vvNew.size();
std::set<int>& vNew = vvNew[nB];
if (vNew.count(nId)) {
for (unsigned int n = 0; n < ADDRMAN_NEW_BUCKET_COUNT; n++) {
int nB = (n + nRnd) % ADDRMAN_NEW_BUCKET_COUNT;
int nBpos = info.GetBucketPosition(nKey, true, nB);
if (vvNew[nB][nBpos] == nId) {
nUBucket = nB;
break;
}
@ -300,7 +260,7 @@ void CAddrMan::Good_(const CService& addr, int64_t nTime)
LogPrint("addrman", "Moving %s to tried\n", addr.ToString());
// move nId to the tried tables
MakeTried(info, nId, nUBucket);
MakeTried(info, nId);
}
bool CAddrMan::Add_(const CAddress& addr, const CNetAddr& source, int64_t nTimePenalty)
@ -348,12 +308,25 @@ bool CAddrMan::Add_(const CAddress& addr, const CNetAddr& source, int64_t nTimeP
}
int nUBucket = pinfo->GetNewBucket(nKey, source);
std::set<int>& vNew = vvNew[nUBucket];
if (!vNew.count(nId)) {
int nUBucketPos = pinfo->GetBucketPosition(nKey, true, nUBucket);
if (vvNew[nUBucket][nUBucketPos] != nId) {
bool fInsert = vvNew[nUBucket][nUBucketPos] == -1;
if (!fInsert) {
CAddrInfo& infoExisting = mapInfo[vvNew[nUBucket][nUBucketPos]];
if (infoExisting.IsTerrible() || (infoExisting.nRefCount > 1 && pinfo->nRefCount == 0)) {
// Overwrite the existing new table entry.
fInsert = true;
}
}
if (fInsert) {
ClearNew(nUBucket, nUBucketPos);
pinfo->nRefCount++;
if (vNew.size() == ADDRMAN_NEW_BUCKET_SIZE)
ShrinkNew(nUBucket);
vvNew[nUBucket].insert(nId);
vvNew[nUBucket][nUBucketPos] = nId;
} else {
if (pinfo->nRefCount == 0) {
Delete(nId);
}
}
}
return fNew;
}
@ -388,13 +361,13 @@ CAddress CAddrMan::Select_(int nUnkBias)
// use a tried node
double fChanceFactor = 1.0;
while (1) {
int nKBucket = GetRandInt(vvTried.size());
std::vector<int>& vTried = vvTried[nKBucket];
if (vTried.size() == 0)
int nKBucket = GetRandInt(ADDRMAN_TRIED_BUCKET_COUNT);
int nKBucketPos = GetRandInt(ADDRMAN_BUCKET_SIZE);
if (vvTried[nKBucket][nKBucketPos] == -1)
continue;
int nPos = GetRandInt(vTried.size());
assert(mapInfo.count(vTried[nPos]) == 1);
CAddrInfo& info = mapInfo[vTried[nPos]];
int nId = vvTried[nKBucket][nKBucketPos];
assert(mapInfo.count(nId) == 1);
CAddrInfo& info = mapInfo[nId];
if (GetRandInt(1 << 30) < fChanceFactor * info.GetChance() * (1 << 30))
return info;
fChanceFactor *= 1.2;
@ -403,16 +376,13 @@ CAddress CAddrMan::Select_(int nUnkBias)
// use a new node
double fChanceFactor = 1.0;
while (1) {
int nUBucket = GetRandInt(vvNew.size());
std::set<int>& vNew = vvNew[nUBucket];
if (vNew.size() == 0)
int nUBucket = GetRandInt(ADDRMAN_NEW_BUCKET_COUNT);
int nUBucketPos = GetRandInt(ADDRMAN_BUCKET_SIZE);
if (vvNew[nUBucket][nUBucketPos] == -1)
continue;
int nPos = GetRandInt(vNew.size());
std::set<int>::iterator it = vNew.begin();
while (nPos--)
it++;
assert(mapInfo.count(*it) == 1);
CAddrInfo& info = mapInfo[*it];
int nId = vvNew[nUBucket][nUBucketPos];
assert(mapInfo.count(nId) == 1);
CAddrInfo& info = mapInfo[nId];
if (GetRandInt(1 << 30) < fChanceFactor * info.GetChance() * (1 << 30))
return info;
fChanceFactor *= 1.2;
@ -460,22 +430,30 @@ int CAddrMan::Check_()
if (mapNew.size() != nNew)
return -10;
for (int n = 0; n < vvTried.size(); n++) {
std::vector<int>& vTried = vvTried[n];
for (std::vector<int>::iterator it = vTried.begin(); it != vTried.end(); it++) {
if (!setTried.count(*it))
for (int n = 0; n < ADDRMAN_TRIED_BUCKET_COUNT; n++) {
for (int i = 0; i < ADDRMAN_BUCKET_SIZE; i++) {
if (vvTried[n][i] != -1) {
if (!setTried.count(vvTried[n][i]))
return -11;
setTried.erase(*it);
if (mapInfo[vvTried[n][i]].GetTriedBucket(nKey) != n)
return -17;
if (mapInfo[vvTried[n][i]].GetBucketPosition(nKey, false, n) != i)
return -18;
setTried.erase(vvTried[n][i]);
}
}
}
for (int n = 0; n < vvNew.size(); n++) {
std::set<int>& vNew = vvNew[n];
for (std::set<int>::iterator it = vNew.begin(); it != vNew.end(); it++) {
if (!mapNew.count(*it))
for (int n = 0; n < ADDRMAN_NEW_BUCKET_COUNT; n++) {
for (int i = 0; i < ADDRMAN_BUCKET_SIZE; i++) {
if (vvNew[n][i] != -1) {
if (!mapNew.count(vvNew[n][i]))
return -12;
if (--mapNew[*it] == 0)
mapNew.erase(*it);
if (mapInfo[vvNew[n][i]].GetBucketPosition(nKey, true, n) != i)
return -19;
if (--mapNew[vvNew[n][i]] == 0)
mapNew.erase(vvNew[n][i]);
}
}
}

149
src/addrman.h
Unescape View File

@ -10,7 +10,6 @@
#include "random.h"
#include "sync.h"
#include "timedata.h"
#include "uint256.h"
#include "util.h"
#include <map>
@ -91,6 +90,9 @@ public:
return GetNewBucket(nKey, source);
}
//! Calculate in which position of a bucket to store this entry.
int GetBucketPosition(const uint256 &nKey, bool fNew, int nBucket) const;
//! Determine whether the statistics about this entry are bad enough so that it can just be deleted
bool IsTerrible(int64_t nNow = GetAdjustedTime()) const;
@ -128,14 +130,11 @@ public:
//! total number of buckets for tried addresses
#define ADDRMAN_TRIED_BUCKET_COUNT 64
//! maximum allowed number of entries in buckets for tried addresses
#define ADDRMAN_TRIED_BUCKET_SIZE 64
//! total number of buckets for new addresses
#define ADDRMAN_NEW_BUCKET_COUNT 256
//! maximum allowed number of entries in buckets for new addresses
#define ADDRMAN_NEW_BUCKET_SIZE 64
//! maximum allowed number of entries in buckets for new and tried addresses
#define ADDRMAN_BUCKET_SIZE 64
//! over how many buckets entries with tried addresses from a single group (/16 for IPv4) are spread
#define ADDRMAN_TRIED_BUCKETS_PER_GROUP 4
@ -146,9 +145,6 @@ public:
//! in how many buckets for entries with new addresses a single address may occur
#define ADDRMAN_NEW_BUCKETS_PER_ADDRESS 4
//! how many entries in a bucket with tried addresses are inspected, when selecting one to replace
#define ADDRMAN_TRIED_ENTRIES_INSPECT_ON_EVICT 4
//! how old addresses can maximally be
#define ADDRMAN_HORIZON_DAYS 30
@ -195,13 +191,13 @@ private:
int nTried;
//! list of "tried" buckets
std::vector<std::vector<int> > vvTried;
int vvTried[ADDRMAN_TRIED_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE];
//! number of (unique) "new" entries
int nNew;
//! list of "new" buckets
std::vector<std::set<int> > vvNew;
int vvNew[ADDRMAN_NEW_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE];
protected:
@ -215,17 +211,14 @@ protected:
//! Swap two elements in vRandom.
void SwapRandom(unsigned int nRandomPos1, unsigned int nRandomPos2);
//! Return position in given bucket to replace.
int SelectTried(int nKBucket);
//! Move an entry from the "new" table(s) to the "tried" table
void MakeTried(CAddrInfo& info, int nId);
//! Remove an element from a "new" bucket.
//! This is the only place where actual deletions occur.
//! Elements are never deleted while in the "tried" table, only possibly evicted back to the "new" table.
int ShrinkNew(int nUBucket);
//! Delete an entry. It must not be in tried, and have refcount 0.
void Delete(int nId);
//! Move an entry from the "new" table(s) to the "tried" table
//! @pre vvUnkown[nOrigin].count(nId) != 0
void MakeTried(CAddrInfo& info, int nId, int nOrigin);
//! Clear a position in a "new" table. This is the only place where entries are actually deleted.
void ClearNew(int nUBucket, int nUBucketPos);
//! Mark an entry "good", possibly moving it from "new" to "tried".
void Good_(const CService &addr, int64_t nTime);
@ -254,17 +247,21 @@ protected:
public:
/**
* serialized format:
* * version byte (currently 0)
* * nKey
* * version byte (currently 1)
* * 0x20 + nKey (serialized as if it were a vector, for backward compatibility)
* * nNew
* * nTried
* * number of "new" buckets
* * number of "new" buckets XOR 2**30
* * all nNew addrinfos in vvNew
* * all nTried addrinfos in vvTried
* * for each bucket:
* * number of elements
* * for each element: index
*
* 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.
*
* Notice that vvTried, mapAddr and vVector are never encoded explicitly;
* they are instead reconstructed from the other information.
*
@ -276,119 +273,153 @@ public:
*
* We don't use ADD_SERIALIZE_METHODS since the serialization and deserialization code has
* very little in common.
*
*/
template<typename Stream>
void Serialize(Stream &s, int nType, int nVersionDummy) const
{
LOCK(cs);
unsigned char nVersion = 0;
unsigned char nVersion = 1;
s << nVersion;
s << ((unsigned char)32);
s << nKey;
s << nNew;
s << nTried;
int nUBuckets = ADDRMAN_NEW_BUCKET_COUNT;
int nUBuckets = ADDRMAN_NEW_BUCKET_COUNT ^ (1 << 30);
s << nUBuckets;
std::map<int, int> mapUnkIds;
int nIds = 0;
for (std::map<int, CAddrInfo>::const_iterator it = mapInfo.begin(); it != mapInfo.end(); it++) {
if (nIds == nNew) break; // this means nNew was wrong, oh ow
mapUnkIds[(*it).first] = nIds;
const CAddrInfo &info = (*it).second;
if (info.nRefCount) {
assert(nIds != nNew); // this means nNew was wrong, oh ow
s << info;
nIds++;
}
}
nIds = 0;
for (std::map<int, CAddrInfo>::const_iterator it = mapInfo.begin(); it != mapInfo.end(); it++) {
if (nIds == nTried) break; // this means nTried was wrong, oh ow
const CAddrInfo &info = (*it).second;
if (info.fInTried) {
assert(nIds != nTried); // this means nTried was wrong, oh ow
s << info;
nIds++;
}
}
for (std::vector<std::set<int> >::const_iterator it = vvNew.begin(); it != vvNew.end(); it++) {
const std::set<int> &vNew = (*it);
int nSize = vNew.size();
for (int bucket = 0; bucket < ADDRMAN_NEW_BUCKET_COUNT; bucket++) {
int nSize = 0;
for (int i = 0; i < ADDRMAN_BUCKET_SIZE; i++) {
if (vvNew[bucket][i] != -1)
nSize++;
}
s << nSize;
for (std::set<int>::const_iterator it2 = vNew.begin(); it2 != vNew.end(); it2++) {
int nIndex = mapUnkIds[*it2];
for (int i = 0; i < ADDRMAN_BUCKET_SIZE; i++) {
if (vvNew[bucket][i] != -1) {
int nIndex = mapUnkIds[vvNew[bucket][i]];
s << nIndex;
}
}
}
}
template<typename Stream>
void Unserialize(Stream& s, int nType, int nVersionDummy)
{
LOCK(cs);
Clear();
unsigned char nVersion;
s >> nVersion;
unsigned char nKeySize;
s >> nKeySize;
if (nKeySize != 32) throw std::ios_base::failure("Incorrect keysize in addrman");
if (nKeySize != 32) throw std::ios_base::failure("Incorrect keysize in addrman deserialization");
s >> nKey;
s >> nNew;
s >> nTried;
int nUBuckets = 0;
s >> nUBuckets;
nIdCount = 0;
mapInfo.clear();
mapAddr.clear();
vRandom.clear();
vvTried = std::vector<std::vector<int> >(ADDRMAN_TRIED_BUCKET_COUNT, std::vector<int>(0));
vvNew = std::vector<std::set<int> >(ADDRMAN_NEW_BUCKET_COUNT, std::set<int>());
if (nVersion != 0) {
nUBuckets ^= (1 << 30);
}
// Deserialize entries from the new table.
for (int n = 0; n < nNew; n++) {
CAddrInfo &info = mapInfo[n];
s >> info;
mapAddr[info] = n;
info.nRandomPos = vRandom.size();
vRandom.push_back(n);
if (nUBuckets != ADDRMAN_NEW_BUCKET_COUNT) {
vvNew[info.GetNewBucket(nKey)].insert(n);
if (nVersion != 1 || nUBuckets != ADDRMAN_NEW_BUCKET_COUNT) {
// In case the new table data cannot be used (nVersion unknown, or bucket count wrong),
// immediately try to give them a reference based on their primary source address.
int nUBucket = info.GetNewBucket(nKey);
int nUBucketPos = info.GetBucketPosition(nKey, true, nUBucket);
if (vvNew[nUBucket][nUBucketPos] == -1) {
vvNew[nUBucket][nUBucketPos] = n;
info.nRefCount++;
}
}
}
nIdCount = nNew;
// Deserialize entries from the tried table.
int nLost = 0;
for (int n = 0; n < nTried; n++) {
CAddrInfo info;
s >> info;
std::vector<int> &vTried = vvTried[info.GetTriedBucket(nKey)];
if (vTried.size() < ADDRMAN_TRIED_BUCKET_SIZE) {
int nKBucket = info.GetTriedBucket(nKey);
int nKBucketPos = info.GetBucketPosition(nKey, false, nKBucket);
if (vvTried[nKBucket][nKBucketPos] == -1) {
info.nRandomPos = vRandom.size();
info.fInTried = true;
vRandom.push_back(nIdCount);
mapInfo[nIdCount] = info;
mapAddr[info] = nIdCount;
vTried.push_back(nIdCount);
vvTried[nKBucket][nKBucketPos] = nIdCount;
nIdCount++;
} else {
nLost++;
}
}
nTried -= nLost;
for (int b = 0; b < nUBuckets; b++) {
std::set<int> &vNew = vvNew[b];
// Deserialize positions in the new table (if possible).
for (int bucket = 0; bucket < nUBuckets; bucket++) {
int nSize = 0;
s >> nSize;
for (int n = 0; n < nSize; n++) {
int nIndex = 0;
s >> nIndex;
if (nIndex >= 0 && nIndex < nNew) {
CAddrInfo &info = mapInfo[nIndex];
if (nUBuckets == ADDRMAN_NEW_BUCKET_COUNT && info.nRefCount < ADDRMAN_NEW_BUCKETS_PER_ADDRESS) {
int nUBucketPos = info.GetBucketPosition(nKey, true, bucket);
if (nVersion == 1 && nUBuckets == ADDRMAN_NEW_BUCKET_COUNT && vvNew[bucket][nUBucketPos] == -1 && info.nRefCount < ADDRMAN_NEW_BUCKETS_PER_ADDRESS) {
info.nRefCount++;
vNew.insert(nIndex);
vvNew[bucket][nUBucketPos] = nIndex;
}
}
}
}
// Prune new entries with refcount 0 (as a result of collisions).
int nLostUnk = 0;
for (std::map<int, CAddrInfo>::const_iterator it = mapInfo.begin(); it != mapInfo.end(); ) {
if (it->second.fInTried == false && it->second.nRefCount == 0) {
std::map<int, CAddrInfo>::const_iterator itCopy = it++;
Delete(itCopy->first);
nLostUnk++;
} else {
it++;
}
}
if (nLost + nLostUnk > 0) {
LogPrint("addrman", "addrman lost %i new and %i tried addresses due to collisions\n", nLostUnk, nLost);
}
Check();
}
unsigned int GetSerializeSize(int nType, int nVersion) const
@ -396,15 +427,31 @@ public:
return (CSizeComputer(nType, nVersion) << *this).size();
}
CAddrMan() : vRandom(0), vvTried(ADDRMAN_TRIED_BUCKET_COUNT, std::vector<int>(0)), vvNew(ADDRMAN_NEW_BUCKET_COUNT, std::set<int>())
void Clear()
{
std::vector<int>().swap(vRandom);
nKey = GetRandHash();
for (size_t bucket = 0; bucket < ADDRMAN_NEW_BUCKET_COUNT; bucket++) {
for (size_t entry = 0; entry < ADDRMAN_BUCKET_SIZE; entry++) {
vvNew[bucket][entry] = -1;
}
}
for (size_t bucket = 0; bucket < ADDRMAN_TRIED_BUCKET_COUNT; bucket++) {
for (size_t entry = 0; entry < ADDRMAN_BUCKET_SIZE; entry++) {
vvTried[bucket][entry] = -1;
}
}
nIdCount = 0;
nTried = 0;
nNew = 0;
}
CAddrMan()
{
Clear();
}
~CAddrMan()
{
nKey.SetNull();

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