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author | Suhas Daftuar <sdaftuar@gmail.com> | 2022-02-09 09:38:52 -0500 |
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committer | Suhas Daftuar <sdaftuar@gmail.com> | 2022-08-29 08:10:35 -0400 |
commit | 551a8d957c4c44afbd0d608fcdf7c6a4352babce (patch) | |
tree | 774014202e3ad8560a3be4d59f94b8443e672a67 /src/validation.cpp | |
parent | ed470940cddbeb40425960d51cefeec4948febe4 (diff) | |
download | bitcoin-551a8d957c4c44afbd0d608fcdf7c6a4352babce.tar.xz |
Utilize anti-DoS headers download strategy
Avoid permanently storing headers from a peer, unless the headers are part of a
chain with sufficiently high work. This prevents memory attacks using low-work
headers.
Designed and co-authored with Pieter Wuille.
Diffstat (limited to 'src/validation.cpp')
-rw-r--r-- | src/validation.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/validation.cpp b/src/validation.cpp index f4cae07b9e..cb8ac664d8 100644 --- a/src/validation.cpp +++ b/src/validation.cpp @@ -3432,6 +3432,22 @@ std::vector<unsigned char> ChainstateManager::GenerateCoinbaseCommitment(CBlock& return commitment; } +bool HasValidProofOfWork(const std::vector<CBlockHeader>& headers, const Consensus::Params& consensusParams) +{ + return std::all_of(headers.cbegin(), headers.cend(), + [&](const auto& header) { return CheckProofOfWork(header.GetHash(), header.nBits, consensusParams);}); +} + +arith_uint256 CalculateHeadersWork(const std::vector<CBlockHeader>& headers) +{ + arith_uint256 total_work{0}; + for (const CBlockHeader& header : headers) { + CBlockIndex dummy(header); + total_work += GetBlockProof(dummy); + } + return total_work; +} + /** Context-dependent validity checks. * By "context", we mean only the previous block headers, but not the UTXO * set; UTXO-related validity checks are done in ConnectBlock(). |