diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/chainparams.cpp | 6 | ||||
| -rw-r--r-- | src/consensus/params.h | 4 | ||||
| -rw-r--r-- | src/validation.cpp | 39 | ||||
| -rw-r--r-- | src/validation.h | 3 |
4 files changed, 42 insertions, 10 deletions
diff --git a/src/chainparams.cpp b/src/chainparams.cpp index 6067503b0b..121d95af90 100644 --- a/src/chainparams.cpp +++ b/src/chainparams.cpp @@ -75,7 +75,7 @@ public: CMainParams() { strNetworkID = "main"; consensus.nSubsidyHalvingInterval = 210000; - consensus.BIP16Height = 173805; // 00000000000000ce80a7e057163a4db1d5ad7b20fb6f598c9597b9665c8fb0d4 - April 1, 2012 + consensus.BIP16Exception = uint256S("0x00000000000002dc756eebf4f49723ed8d30cc28a5f108eb94b1ba88ac4f9c22"); consensus.BIP34Height = 227931; consensus.BIP34Hash = uint256S("0x000000000000024b89b42a942fe0d9fea3bb44ab7bd1b19115dd6a759c0808b8"); consensus.BIP65Height = 388381; // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0 @@ -190,7 +190,7 @@ public: CTestNetParams() { strNetworkID = "test"; consensus.nSubsidyHalvingInterval = 210000; - consensus.BIP16Height = 514; // 00000000040b4e986385315e14bee30ad876d8b47f748025b26683116d21aa65 + consensus.BIP16Exception = uint256S("0x00000000dd30457c001f4095d208cc1296b0eed002427aa599874af7a432b105"); consensus.BIP34Height = 21111; consensus.BIP34Hash = uint256S("0x0000000023b3a96d3484e5abb3755c413e7d41500f8e2a5c3f0dd01299cd8ef8"); consensus.BIP65Height = 581885; // 00000000007f6655f22f98e72ed80d8b06dc761d5da09df0fa1dc4be4f861eb6 @@ -283,7 +283,7 @@ public: CRegTestParams() { strNetworkID = "regtest"; consensus.nSubsidyHalvingInterval = 150; - consensus.BIP16Height = 0; // always enforce P2SH BIP16 on regtest + consensus.BIP16Exception = uint256(); consensus.BIP34Height = 100000000; // BIP34 has not activated on regtest (far in the future so block v1 are not rejected in tests) consensus.BIP34Hash = uint256(); consensus.BIP65Height = 1351; // BIP65 activated on regtest (Used in rpc activation tests) diff --git a/src/consensus/params.h b/src/consensus/params.h index 4ef808c856..0559304fc2 100644 --- a/src/consensus/params.h +++ b/src/consensus/params.h @@ -49,8 +49,8 @@ struct BIP9Deployment { struct Params { uint256 hashGenesisBlock; int nSubsidyHalvingInterval; - /** Block height at which BIP16 becomes active */ - int BIP16Height; + /* Block hash that is excepted from BIP16 enforcement */ + uint256 BIP16Exception; /** Block height and hash at which BIP34 becomes active */ int BIP34Height; uint256 BIP34Hash; diff --git a/src/validation.cpp b/src/validation.cpp index 3726cb3b14..daa33d3f5a 100644 --- a/src/validation.cpp +++ b/src/validation.cpp @@ -1726,16 +1726,38 @@ public: // Protected by cs_main static ThresholdConditionCache warningcache[VERSIONBITS_NUM_BITS]; +// 0.13.0 was shipped with a segwit deployment defined for testnet, but not for +// mainnet. We no longer need to support disabling the segwit deployment +// except for testing purposes, due to limitations of the functional test +// environment. See test/functional/p2p-segwit.py. +static bool IsScriptWitnessEnabled(const Consensus::Params& params) +{ + return params.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout != 0; +} + static unsigned int GetBlockScriptFlags(const CBlockIndex* pindex, const Consensus::Params& consensusparams) { AssertLockHeld(cs_main); unsigned int flags = SCRIPT_VERIFY_NONE; - // Start enforcing P2SH (BIP16) - if (pindex->nHeight >= consensusparams.BIP16Height) { + // BIP16 didn't become active until Apr 1 2012 (on mainnet, and + // retroactively applied to testnet) + // However, only one historical block violated the P2SH rules (on both + // mainnet and testnet), so for simplicity, always leave P2SH + // on except for the one violating block. + if (consensusparams.BIP16Exception.IsNull() || // no bip16 exception on this chain + pindex->phashBlock == nullptr || // this is a new candidate block, eg from TestBlockValidity() + *pindex->phashBlock != consensusparams.BIP16Exception) // this block isn't the historical exception + { flags |= SCRIPT_VERIFY_P2SH; } + // Enforce WITNESS rules whenever P2SH is in effect (and the segwit + // deployment is defined). + if (flags & SCRIPT_VERIFY_P2SH && IsScriptWitnessEnabled(consensusparams)) { + flags |= SCRIPT_VERIFY_WITNESS; + } + // Start enforcing the DERSIG (BIP66) rule if (pindex->nHeight >= consensusparams.BIP66Height) { flags |= SCRIPT_VERIFY_DERSIG; @@ -1751,9 +1773,7 @@ static unsigned int GetBlockScriptFlags(const CBlockIndex* pindex, const Consens flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY; } - // Start enforcing WITNESS rules using versionbits logic. - if (IsWitnessEnabled(pindex->pprev, consensusparams)) { - flags |= SCRIPT_VERIFY_WITNESS; + if (IsNullDummyEnabled(pindex->pprev, consensusparams)) { flags |= SCRIPT_VERIFY_NULLDUMMY; } @@ -3099,6 +3119,12 @@ bool IsWitnessEnabled(const CBlockIndex* pindexPrev, const Consensus::Params& pa return (VersionBitsState(pindexPrev, params, Consensus::DEPLOYMENT_SEGWIT, versionbitscache) == ThresholdState::ACTIVE); } +bool IsNullDummyEnabled(const CBlockIndex* pindexPrev, const Consensus::Params& params) +{ + LOCK(cs_main); + return (VersionBitsState(pindexPrev, params, Consensus::DEPLOYMENT_SEGWIT, versionbitscache) == ThresholdState::ACTIVE); +} + // Compute at which vout of the block's coinbase transaction the witness // commitment occurs, or -1 if not found. static int GetWitnessCommitmentIndex(const CBlock& block) @@ -4091,6 +4117,9 @@ bool CChainState::RewindBlockIndex(const CChainParams& params) int nHeight = 1; while (nHeight <= chainActive.Height()) { + // Although SCRIPT_VERIFY_WITNESS is now generally enforced on all + // blocks in ConnectBlock, we don't need to go back and + // re-download/re-verify blocks from before segwit actually activated. if (IsWitnessEnabled(chainActive[nHeight - 1], params.GetConsensus()) && !(chainActive[nHeight]->nStatus & BLOCK_OPT_WITNESS)) { break; } diff --git a/src/validation.h b/src/validation.h index 3668484696..b415a85053 100644 --- a/src/validation.h +++ b/src/validation.h @@ -411,6 +411,9 @@ bool TestBlockValidity(CValidationState& state, const CChainParams& chainparams, /** Check whether witness commitments are required for block. */ bool IsWitnessEnabled(const CBlockIndex* pindexPrev, const Consensus::Params& params); +/** Check whether NULLDUMMY (BIP 147) has activated. */ +bool IsNullDummyEnabled(const CBlockIndex* pindexPrev, const Consensus::Params& params); + /** When there are blocks in the active chain with missing data, rewind the chainstate and remove them from the block index */ bool RewindBlockIndex(const CChainParams& params); |