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Introduce contextual block checks for dynafed

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This commit is contained in:
Gregory Sanders 2019-05-31 13:16:05 -04:00
parent 8f2194c901
commit fb333b3ed8
1 changed files with 37 additions and 0 deletions
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37
src/validation.cpp
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@ -43,6 +43,7 @@
// ELEMENTS
#include <block_proof.h> // CheckChallenge, CheckProof
#include <dynafed.h>
#include <future>
#include <sstream>
@ -3452,6 +3453,36 @@ std::vector<unsigned char> GenerateCoinbaseCommitment(CBlock& block, const CBloc
// ELEMENTS
static bool ContextualCheckDynaFedHeader(const CBlockHeader& block, CValidationState& state, const CChainParams& params, const CBlockIndex* pindexPrev)
{
// When not active, it's a NOP
if (!IsDynaFedEnabled(pindexPrev, params.GetConsensus())) {
return true;
}
const DynaFedParams& d_params = block.m_dyna_params;
// Dynamic blocks must at least publish current signblockscript in full
if (d_params.m_current.IsNull()) {
return state.Invalid(false, REJECT_INVALID, "invalid-dyna-fed", "dynamic block headers must have non-empty current signblockscript field");
}
// Make sure extension bits aren't active, reserved for future HF
uint32_t reserved_mask = (1<<23) | (1<<24) | (1<<25) | (1<<26);
if ((block.nVersion & reserved_mask) != 0) {
return state.Invalid(false, REJECT_INVALID, "invalid-dyna-fed", "dynamic block header has unknown HF extension bits set");
}
const ConsensusParamEntry expected_current_params = ComputeNextBlockCurrentParameters(pindexPrev, params.GetConsensus());
if (expected_current_params != d_params.m_current) {
return state.Invalid(false, REJECT_INVALID, "invalid-dyna-fed", "dynamic block header's current parameters do not match expected");
}
return true;
}
/** 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().
@ -3502,6 +3533,12 @@ static bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationSta
return state.Invalid(false, REJECT_OBSOLETE, strprintf("bad-version(0x%08x)", block.nVersion),
strprintf("rejected nVersion=0x%08x block", block.nVersion));
// check for dynamic federations activation, then ensuring block header version
// bits are set. These bits drive serialization of the header.
if (!ContextualCheckDynaFedHeader(block, state, params, pindexPrev)) {
return false;
}
return true;
}