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Don't store or send side-chain blocks lower than last checkpoint.

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This commit is contained in:
Ashley Holman 2014-01-19 17:59:57 -06:00
parent dd7c1cf534
commit d8b4b49667
1 changed files with 24 additions and 1 deletions
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25
src/main.cpp
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@ -2154,6 +2154,11 @@ bool AcceptBlock(CBlock& block, CValidationState& state, CDiskBlockPos* dbp)
return state.DoS(100, error("AcceptBlock() : rejected by checkpoint lock-in at %d", nHeight), return state.DoS(100, error("AcceptBlock() : rejected by checkpoint lock-in at %d", nHeight),
REJECT_CHECKPOINT, "checkpoint mismatch"); REJECT_CHECKPOINT, "checkpoint mismatch");
// Don't accept any forks from the main chain prior to last checkpoint
CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(mapBlockIndex);
if (pcheckpoint && nHeight < pcheckpoint->nHeight)
return state.DoS(100, error("AcceptBlock() : forked chain older than last checkpoint (height %d)", nHeight));
// Reject block.nVersion=1 blocks when 95% (75% on testnet) of the network has upgraded: // Reject block.nVersion=1 blocks when 95% (75% on testnet) of the network has upgraded:
if (block.nVersion < 2) if (block.nVersion < 2)
{ {
@ -3025,10 +3030,28 @@ void static ProcessGetData(CNode* pfrom)
if (inv.type == MSG_BLOCK || inv.type == MSG_FILTERED_BLOCK) if (inv.type == MSG_BLOCK || inv.type == MSG_FILTERED_BLOCK)
{ {
// Send block from disk bool send = false;
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(inv.hash); map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(inv.hash);
if (mi != mapBlockIndex.end()) if (mi != mapBlockIndex.end())
{ {
// If the requested block is at a height below our last
// checkpoint, only serve it if it's in the checkpointed chain
int nHeight = mi->second->nHeight;
CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(mapBlockIndex);
if (pcheckpoint && nHeight < pcheckpoint->nHeight) {
if (!chainActive.Contains(mi->second))
{
LogPrintf("ProcessGetData(): ignoring request for old block that isn't in the main chain\n");
} else {
send = true;
}
} else {
send = true;
}
}
if (send)
{
// Send block from disk
CBlock block; CBlock block;
ReadBlockFromDisk(block, (*mi).second); ReadBlockFromDisk(block, (*mi).second);
if (inv.type == MSG_BLOCK) if (inv.type == MSG_BLOCK)