diff options
Diffstat (limited to 'src/addrman.cpp')
-rw-r--r-- | src/addrman.cpp | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src/addrman.cpp b/src/addrman.cpp index 58feb39b1b..ed5fd06288 100644 --- a/src/addrman.cpp +++ b/src/addrman.cpp @@ -197,10 +197,181 @@ void CAddrMan::Serialize(Stream& s_) const s << asmap_checksum; } +template <typename Stream> +void CAddrMan::Unserialize(Stream& s_) +{ + LOCK(cs); + + assert(vRandom.empty()); + + Format format; + s_ >> Using<CustomUintFormatter<1>>(format); + + int stream_version = s_.GetVersion(); + if (format >= Format::V3_BIP155) { + // Add ADDRV2_FORMAT to the version so that the CNetAddr and CAddress + // unserialize methods know that an address in addrv2 format is coming. + stream_version |= ADDRV2_FORMAT; + } + + OverrideStream<Stream> s(&s_, s_.GetType(), stream_version); + + uint8_t compat; + s >> compat; + const uint8_t lowest_compatible = compat - INCOMPATIBILITY_BASE; + if (lowest_compatible > FILE_FORMAT) { + throw std::ios_base::failure(strprintf( + "Unsupported format of addrman database: %u. It is compatible with formats >=%u, " + "but the maximum supported by this version of %s is %u.", + format, lowest_compatible, PACKAGE_NAME, static_cast<uint8_t>(FILE_FORMAT))); + } + + s >> nKey; + s >> nNew; + s >> nTried; + int nUBuckets = 0; + s >> nUBuckets; + if (format >= Format::V1_DETERMINISTIC) { + nUBuckets ^= (1 << 30); + } + + if (nNew > ADDRMAN_NEW_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE || nNew < 0) { + throw std::ios_base::failure( + strprintf("Corrupt CAddrMan serialization: nNew=%d, should be in [0, %u]", + nNew, + ADDRMAN_NEW_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE)); + } + + if (nTried > ADDRMAN_TRIED_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE || nTried < 0) { + throw std::ios_base::failure( + strprintf("Corrupt CAddrMan serialization: nTried=%d, should be in [0, %u]", + nTried, + ADDRMAN_TRIED_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE)); + } + + // 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); + } + nIdCount = nNew; + + // Deserialize entries from the tried table. + int nLost = 0; + for (int n = 0; n < nTried; n++) { + CAddrInfo info; + s >> info; + int nKBucket = info.GetTriedBucket(nKey, m_asmap); + int nKBucketPos = info.GetBucketPosition(nKey, false, nKBucket); + if (info.IsValid() + && vvTried[nKBucket][nKBucketPos] == -1) { + info.nRandomPos = vRandom.size(); + info.fInTried = true; + vRandom.push_back(nIdCount); + mapInfo[nIdCount] = info; + mapAddr[info] = nIdCount; + vvTried[nKBucket][nKBucketPos] = nIdCount; + nIdCount++; + } else { + nLost++; + } + } + nTried -= nLost; + + // Store positions in the new table buckets to apply later (if possible). + // An entry may appear in up to ADDRMAN_NEW_BUCKETS_PER_ADDRESS buckets, + // so we store all bucket-entry_index pairs to iterate through later. + std::vector<std::pair<int, int>> bucket_entries; + + for (int bucket = 0; bucket < nUBuckets; ++bucket) { + int num_entries{0}; + s >> num_entries; + for (int n = 0; n < num_entries; ++n) { + int entry_index{0}; + s >> entry_index; + if (entry_index >= 0 && entry_index < nNew) { + bucket_entries.emplace_back(bucket, entry_index); + } + } + } + + // If the bucket count and asmap checksum haven't changed, then attempt + // to restore the entries to the buckets/positions they were in before + // serialization. + uint256 supplied_asmap_checksum; + if (m_asmap.size() != 0) { + supplied_asmap_checksum = SerializeHash(m_asmap); + } + uint256 serialized_asmap_checksum; + if (format >= Format::V2_ASMAP) { + s >> serialized_asmap_checksum; + } + const bool restore_bucketing{nUBuckets == ADDRMAN_NEW_BUCKET_COUNT && + serialized_asmap_checksum == supplied_asmap_checksum}; + + if (!restore_bucketing) { + LogPrint(BCLog::ADDRMAN, "Bucketing method was updated, re-bucketing addrman entries from disk\n"); + } + + for (auto bucket_entry : bucket_entries) { + int bucket{bucket_entry.first}; + const int entry_index{bucket_entry.second}; + CAddrInfo& info = mapInfo[entry_index]; + + // Don't store the entry in the new bucket if it's not a valid address for our addrman + if (!info.IsValid()) continue; + + // The entry shouldn't appear in more than + // ADDRMAN_NEW_BUCKETS_PER_ADDRESS. If it has already, just skip + // this bucket_entry. + if (info.nRefCount >= ADDRMAN_NEW_BUCKETS_PER_ADDRESS) continue; + + int bucket_position = info.GetBucketPosition(nKey, true, bucket); + if (restore_bucketing && vvNew[bucket][bucket_position] == -1) { + // Bucketing has not changed, using existing bucket positions for the new table + vvNew[bucket][bucket_position] = entry_index; + ++info.nRefCount; + } else { + // In case the new table data cannot be used (bucket count wrong or new asmap), + // try to give them a reference based on their primary source address. + bucket = info.GetNewBucket(nKey, m_asmap); + bucket_position = info.GetBucketPosition(nKey, true, bucket); + if (vvNew[bucket][bucket_position] == -1) { + vvNew[bucket][bucket_position] = entry_index; + ++info.nRefCount; + } + } + } + + // Prune new entries with refcount 0 (as a result of collisions or invalid address). + int nLostUnk = 0; + for (auto it = mapInfo.cbegin(); it != mapInfo.cend(); ) { + if (it->second.fInTried == false && it->second.nRefCount == 0) { + const auto itCopy = it++; + Delete(itCopy->first); + ++nLostUnk; + } else { + ++it; + } + } + if (nLost + nLostUnk > 0) { + LogPrint(BCLog::ADDRMAN, "addrman lost %i new and %i tried addresses due to collisions or invalid addresses\n", nLostUnk, nLost); + } + + Check(); +} + // explicit instantiation template void CAddrMan::Serialize(CHashWriter& s) const; template void CAddrMan::Serialize(CAutoFile& s) const; template void CAddrMan::Serialize(CDataStream& s) const; +template void CAddrMan::Unserialize(CAutoFile& s); +template void CAddrMan::Unserialize(CHashVerifier<CAutoFile>& s); +template void CAddrMan::Unserialize(CDataStream& s); +template void CAddrMan::Unserialize(CHashVerifier<CDataStream>& s); CAddrInfo* CAddrMan::Find(const CNetAddr& addr, int* pnId) { |