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main.cpp
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main.cpp
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Copyright (c) 2014-2015 The Dash developers
// Copyright (c) 2015-2018 The PIVX developers
// Copyright (c) 2018-2019 The TWINS developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "main.h"
#include "accumulators.h"
#include "accumulatormap.h"
#include "addrman.h"
#include "alert.h"
#include "blocksignature.h"
#include "chainparams.h"
#include "checkpoints.h"
#include "checkqueue.h"
#include "init.h"
#include "kernel.h"
#include "masternode-budget.h"
#include "masternode-payments.h"
#include "masternodeman.h"
#include "merkleblock.h"
#include "net.h"
#include "obfuscation.h"
#include "pow.h"
#include "spork.h"
#include "sporkdb.h"
#include "swifttx.h"
#include "txdb.h"
#include "txmempool.h"
#include "ui_interface.h"
#include "util.h"
#include "utilmoneystr.h"
#include "validationinterface.h"
#include "ztwinschain.h"
#include "primitives/zerocoin.h"
#include "libzerocoin/Denominations.h"
#include "invalid.h"
#include <sstream>
#include <boost/algorithm/string/replace.hpp>
#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>
#include <boost/thread.hpp>
#include <spork.h>
using namespace boost;
using namespace std;
using namespace libzerocoin;
#if defined(NDEBUG)
#error "TWINS cannot be compiled without assertions."
#endif
/**
* Global state
*/
CCriticalSection cs_main;
BlockMap mapBlockIndex;
map<uint256, uint256> mapProofOfStake;
map<unsigned int, unsigned int> mapHashedBlocks;
CChain chainActive;
CBlockIndex* pindexBestHeader = NULL;
int64_t nTimeBestReceived = 0;
CWaitableCriticalSection csBestBlock;
CConditionVariable cvBlockChange;
int nScriptCheckThreads = 0;
bool fImporting = false;
bool fReindex = false;
bool fTxIndex = true;
bool fIsBareMultisigStd = true;
bool fCheckBlockIndex = false;
bool fVerifyingBlocks = false;
unsigned int nCoinCacheSize = 5000;
bool fAlerts = DEFAULT_ALERTS;
unsigned int nStakeMinAge = 3 * 60 * 60;
int64_t nReserveBalance = 0;
/** Fees smaller than this (in utwins) are considered zero fee (for relaying and mining)
* We are ~100 times smaller then bitcoin now (2015-06-23), set minRelayTxFee only 10 times higher
* so it's still 10 times lower comparing to bitcoin.
*/
CFeeRate minRelayTxFee = CFeeRate(100000);
CTxMemPool mempool(::minRelayTxFee);
struct COrphanTx {
CTransaction tx;
NodeId fromPeer;
};
map<uint256, COrphanTx> mapOrphanTransactions;
map<uint256, set<uint256> > mapOrphanTransactionsByPrev;
map<uint256, int64_t> mapRejectedBlocks;
map<uint256, int64_t> mapZerocoinspends; //txid, time received
void EraseOrphansFor(NodeId peer);
static void CheckBlockIndex();
/** Constant stuff for coinbase transactions we create: */
CScript COINBASE_FLAGS;
const string strMessageMagic = "DarkNet Signed Message:\n";
bool isMasternodeCollateral(CAmount nValue) {
if (IsSporkActive(SPORK_TWINS_01_ENABLE_MASTERNODE_TIERS)) {
return Params().isMasternodeTierCollateral(nValue);
} else {
return Params().isMasternodeBaseCollateral(nValue);
}
}
// Internal stuff
namespace
{
struct CBlockIndexWorkComparator {
bool operator()(CBlockIndex* pa, CBlockIndex* pb) const
{
// First sort by most total work, ...
if (pa->nChainWork > pb->nChainWork) return false;
if (pa->nChainWork < pb->nChainWork) return true;
// ... then by earliest time received, ...
if (pa->nSequenceId < pb->nSequenceId) return false;
if (pa->nSequenceId > pb->nSequenceId) return true;
// Use pointer address as tie breaker (should only happen with blocks
// loaded from disk, as those all have id 0).
if (pa < pb) return false;
if (pa > pb) return true;
// Identical blocks.
return false;
}
};
CBlockIndex* pindexBestInvalid;
/**
* The set of all CBlockIndex entries with BLOCK_VALID_TRANSACTIONS (for itself and all ancestors) and
* as good as our current tip or better. Entries may be failed, though.
*/
set<CBlockIndex*, CBlockIndexWorkComparator> setBlockIndexCandidates;
/** Number of nodes with fSyncStarted. */
int nSyncStarted = 0;
/** All pairs A->B, where A (or one if its ancestors) misses transactions, but B has transactions. */
multimap<CBlockIndex*, CBlockIndex*> mapBlocksUnlinked;
CCriticalSection cs_LastBlockFile;
std::vector<CBlockFileInfo> vinfoBlockFile;
int nLastBlockFile = 0;
/**
* Every received block is assigned a unique and increasing identifier, so we
* know which one to give priority in case of a fork.
*/
CCriticalSection cs_nBlockSequenceId;
/** Blocks loaded from disk are assigned id 0, so start the counter at 1. */
uint32_t nBlockSequenceId = 1;
/**
* Sources of received blocks, to be able to send them reject messages or ban
* them, if processing happens afterwards. Protected by cs_main.
*/
map<uint256, NodeId> mapBlockSource;
/** Blocks that are in flight, and that are in the queue to be downloaded. Protected by cs_main. */
struct QueuedBlock {
uint256 hash;
CBlockIndex* pindex; //! Optional.
int64_t nTime; //! Time of "getdata" request in microseconds.
int nValidatedQueuedBefore; //! Number of blocks queued with validated headers (globally) at the time this one is requested.
bool fValidatedHeaders; //! Whether this block has validated headers at the time of request.
};
map<uint256, pair<NodeId, list<QueuedBlock>::iterator> > mapBlocksInFlight;
/** Number of blocks in flight with validated headers. */
int nQueuedValidatedHeaders = 0;
/** Number of preferable block download peers. */
int nPreferredDownload = 0;
/** Dirty block index entries. */
set<CBlockIndex*> setDirtyBlockIndex;
/** Dirty block file entries. */
set<int> setDirtyFileInfo;
} // anon namespace
//////////////////////////////////////////////////////////////////////////////
//
// Registration of network node signals.
//
namespace
{
struct CBlockReject {
unsigned char chRejectCode;
string strRejectReason;
uint256 hashBlock;
};
class CNodeBlocks
{
public:
CNodeBlocks():
maxSize(0),
maxAvg(0)
{
maxSize = GetArg("-blockspamfiltermaxsize", DEFAULT_BLOCK_SPAM_FILTER_MAX_SIZE);
maxAvg = GetArg("-blockspamfiltermaxavg", DEFAULT_BLOCK_SPAM_FILTER_MAX_AVG);
}
bool onBlockReceived(int nHeight) {
if(nHeight > 0 && maxSize && maxAvg) {
addPoint(nHeight);
return true;
}
return false;
}
bool updateState(CValidationState& state, bool ret)
{
// No Blocks
size_t size = points.size();
if(size == 0)
return ret;
// Compute the number of the received blocks
size_t nBlocks = 0;
for(auto point : points)
{
nBlocks += point.second;
}
// Compute the average value per height
double nAvgValue = (double)nBlocks / size;
// Ban the node if try to spam
bool banNode = (nAvgValue >= 1.5 * maxAvg && size >= maxAvg) ||
(nAvgValue >= maxAvg && nBlocks >= maxSize) ||
(nBlocks >= maxSize * 3);
if(banNode)
{
// Clear the points and ban the node
points.clear();
return state.DoS(100, error("block-spam ban node for sending spam"));
}
return ret;
}
private:
void addPoint(int height)
{
// Remove the last element in the list
if(points.size() == maxSize)
{
points.erase(points.begin());
}
// Add the point to the list
int occurrence = 0;
auto mi = points.find(height);
if (mi != points.end())
occurrence = (*mi).second;
occurrence++;
points[height] = occurrence;
}
private:
std::map<int,int> points;
size_t maxSize;
size_t maxAvg;
};
/**
* Maintain validation-specific state about nodes, protected by cs_main, instead
* by CNode's own locks. This simplifies asynchronous operation, where
* processing of incoming data is done after the ProcessMessage call returns,
* and we're no longer holding the node's locks.
*/
struct CNodeState {
//! The peer's address
CService address;
//! Whether we have a fully established connection.
bool fCurrentlyConnected;
//! Accumulated misbehaviour score for this peer.
int nMisbehavior;
//! Whether this peer should be disconnected and banned (unless whitelisted).
bool fShouldBan;
//! String name of this peer (debugging/logging purposes).
std::string name;
//! List of asynchronously-determined block rejections to notify this peer about.
std::vector<CBlockReject> rejects;
//! The best known block we know this peer has announced.
CBlockIndex* pindexBestKnownBlock;
//! The hash of the last unknown block this peer has announced.
uint256 hashLastUnknownBlock;
//! The last full block we both have.
CBlockIndex* pindexLastCommonBlock;
//! Whether we've started headers synchronization with this peer.
bool fSyncStarted;
//! Since when we're stalling block download progress (in microseconds), or 0.
int64_t nStallingSince;
list<QueuedBlock> vBlocksInFlight;
int nBlocksInFlight;
//! Whether we consider this a preferred download peer.
bool fPreferredDownload;
CNodeBlocks nodeBlocks;
CNodeState()
{
fCurrentlyConnected = false;
nMisbehavior = 0;
fShouldBan = false;
pindexBestKnownBlock = NULL;
hashLastUnknownBlock = uint256(0);
pindexLastCommonBlock = NULL;
fSyncStarted = false;
nStallingSince = 0;
nBlocksInFlight = 0;
fPreferredDownload = false;
}
};
/** Map maintaining per-node state. Requires cs_main. */
map<NodeId, CNodeState> mapNodeState;
// Requires cs_main.
CNodeState* State(NodeId pnode)
{
map<NodeId, CNodeState>::iterator it = mapNodeState.find(pnode);
if (it == mapNodeState.end())
return NULL;
return &it->second;
}
int GetHeight()
{
while (true) {
TRY_LOCK(cs_main, lockMain);
if (!lockMain) {
MilliSleep(50);
continue;
}
return chainActive.Height();
}
}
void UpdatePreferredDownload(CNode* node, CNodeState* state)
{
nPreferredDownload -= state->fPreferredDownload;
// Whether this node should be marked as a preferred download node.
state->fPreferredDownload = (!node->fInbound || node->fWhitelisted) && !node->fOneShot && !node->fClient;
nPreferredDownload += state->fPreferredDownload;
}
void InitializeNode(NodeId nodeid, const CNode* pnode)
{
LOCK(cs_main);
CNodeState& state = mapNodeState.insert(std::make_pair(nodeid, CNodeState())).first->second;
state.name = pnode->addrName;
state.address = pnode->addr;
}
void FinalizeNode(NodeId nodeid)
{
LOCK(cs_main);
CNodeState* state = State(nodeid);
if (state->fSyncStarted)
nSyncStarted--;
if (state->nMisbehavior == 0 && state->fCurrentlyConnected) {
AddressCurrentlyConnected(state->address);
}
BOOST_FOREACH (const QueuedBlock& entry, state->vBlocksInFlight)
mapBlocksInFlight.erase(entry.hash);
EraseOrphansFor(nodeid);
nPreferredDownload -= state->fPreferredDownload;
mapNodeState.erase(nodeid);
}
// Requires cs_main.
void MarkBlockAsReceived(const uint256& hash)
{
map<uint256, pair<NodeId, list<QueuedBlock>::iterator> >::iterator itInFlight = mapBlocksInFlight.find(hash);
if (itInFlight != mapBlocksInFlight.end()) {
CNodeState* state = State(itInFlight->second.first);
nQueuedValidatedHeaders -= itInFlight->second.second->fValidatedHeaders;
state->vBlocksInFlight.erase(itInFlight->second.second);
state->nBlocksInFlight--;
state->nStallingSince = 0;
mapBlocksInFlight.erase(itInFlight);
}
}
// Requires cs_main.
void MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, CBlockIndex* pindex = NULL)
{
CNodeState* state = State(nodeid);
assert(state != NULL);
// Make sure it's not listed somewhere already.
MarkBlockAsReceived(hash);
QueuedBlock newentry = {hash, pindex, GetTimeMicros(), nQueuedValidatedHeaders, pindex != NULL};
nQueuedValidatedHeaders += newentry.fValidatedHeaders;
list<QueuedBlock>::iterator it = state->vBlocksInFlight.insert(state->vBlocksInFlight.end(), newentry);
state->nBlocksInFlight++;
mapBlocksInFlight[hash] = std::make_pair(nodeid, it);
}
/** Check whether the last unknown block a peer advertized is not yet known. */
void ProcessBlockAvailability(NodeId nodeid)
{
CNodeState* state = State(nodeid);
assert(state != NULL);
if (state->hashLastUnknownBlock != 0) {
BlockMap::iterator itOld = mapBlockIndex.find(state->hashLastUnknownBlock);
if (itOld != mapBlockIndex.end() && itOld->second != NULL && itOld->second->nChainWork > 0) {
if (state->pindexBestKnownBlock == NULL || itOld->second->nChainWork >= state->pindexBestKnownBlock->nChainWork)
state->pindexBestKnownBlock = itOld->second;
state->hashLastUnknownBlock = uint256(0);
}
if (itOld != mapBlockIndex.end() && itOld->second == NULL) mapBlockIndex.erase(itOld);
}
}
/** Update tracking information about which blocks a peer is assumed to have. */
void UpdateBlockAvailability(NodeId nodeid, const uint256& hash)
{
CNodeState* state = State(nodeid);
assert(state != NULL);
ProcessBlockAvailability(nodeid);
BlockMap::iterator it = mapBlockIndex.find(hash);
if (it != mapBlockIndex.end() && it->second != NULL && it->second->nChainWork > 0) {
// An actually better block was announced.
if (state->pindexBestKnownBlock == NULL || it->second->nChainWork >= state->pindexBestKnownBlock->nChainWork)
state->pindexBestKnownBlock = it->second;
} else {
// An unknown block was announced; just assume that the latest one is the best one.
state->hashLastUnknownBlock = hash;
}
}
/** Find the last common ancestor two blocks have.
* Both pa and pb must be non-NULL. */
CBlockIndex* LastCommonAncestor(CBlockIndex* pa, CBlockIndex* pb)
{
if (pa->nHeight > pb->nHeight) {
pa = pa->GetAncestor(pb->nHeight);
} else if (pb->nHeight > pa->nHeight) {
pb = pb->GetAncestor(pa->nHeight);
}
while (pa != pb && pa && pb) {
pa = pa->pprev;
pb = pb->pprev;
}
// Eventually all chain branches meet at the genesis block.
assert(pa == pb);
return pa;
}
/** Update pindexLastCommonBlock and add not-in-flight missing successors to vBlocks, until it has
* at most count entries. */
void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector<CBlockIndex*>& vBlocks, NodeId& nodeStaller)
{
if (count == 0)
return;
vBlocks.reserve(vBlocks.size() + count);
CNodeState* state = State(nodeid);
assert(state != NULL);
// Make sure pindexBestKnownBlock is up to date, we'll need it.
ProcessBlockAvailability(nodeid);
if (state->pindexBestKnownBlock == NULL || state->pindexBestKnownBlock->nChainWork < chainActive.Tip()->nChainWork) {
// This peer has nothing interesting.
return;
}
if (state->pindexLastCommonBlock == NULL) {
// Bootstrap quickly by guessing a parent of our best tip is the forking point.
// Guessing wrong in either direction is not a problem.
state->pindexLastCommonBlock = chainActive[std::min(state->pindexBestKnownBlock->nHeight, chainActive.Height())];
}
// If the peer reorganized, our previous pindexLastCommonBlock may not be an ancestor
// of their current tip anymore. Go back enough to fix that.
state->pindexLastCommonBlock = LastCommonAncestor(state->pindexLastCommonBlock, state->pindexBestKnownBlock);
if (state->pindexLastCommonBlock == state->pindexBestKnownBlock)
return;
std::vector<CBlockIndex*> vToFetch;
CBlockIndex* pindexWalk = state->pindexLastCommonBlock;
// Never fetch further than the best block we know the peer has, or more than BLOCK_DOWNLOAD_WINDOW + 1 beyond the last
// linked block we have in common with this peer. The +1 is so we can detect stalling, namely if we would be able to
// download that next block if the window were 1 larger.
int nWindowEnd = state->pindexLastCommonBlock->nHeight + BLOCK_DOWNLOAD_WINDOW;
int nMaxHeight = std::min<int>(state->pindexBestKnownBlock->nHeight, nWindowEnd + 1);
NodeId waitingfor = -1;
while (pindexWalk->nHeight < nMaxHeight) {
// Read up to 128 (or more, if more blocks than that are needed) successors of pindexWalk (towards
// pindexBestKnownBlock) into vToFetch. We fetch 128, because CBlockIndex::GetAncestor may be as expensive
// as iterating over ~100 CBlockIndex* entries anyway.
int nToFetch = std::min(nMaxHeight - pindexWalk->nHeight, std::max<int>(count - vBlocks.size(), 128));
vToFetch.resize(nToFetch);
pindexWalk = state->pindexBestKnownBlock->GetAncestor(pindexWalk->nHeight + nToFetch);
vToFetch[nToFetch - 1] = pindexWalk;
for (unsigned int i = nToFetch - 1; i > 0; i--) {
vToFetch[i - 1] = vToFetch[i]->pprev;
}
// Iterate over those blocks in vToFetch (in forward direction), adding the ones that
// are not yet downloaded and not in flight to vBlocks. In the mean time, update
// pindexLastCommonBlock as long as all ancestors are already downloaded.
BOOST_FOREACH (CBlockIndex* pindex, vToFetch) {
if (!pindex->IsValid(BLOCK_VALID_TREE)) {
// We consider the chain that this peer is on invalid.
return;
}
if (pindex->nStatus & BLOCK_HAVE_DATA) {
if (pindex->nChainTx)
state->pindexLastCommonBlock = pindex;
} else if (mapBlocksInFlight.count(pindex->GetBlockHash()) == 0) {
// The block is not already downloaded, and not yet in flight.
if (pindex->nHeight > nWindowEnd) {
// We reached the end of the window.
if (vBlocks.size() == 0 && waitingfor != nodeid) {
// We aren't able to fetch anything, but we would be if the download window was one larger.
nodeStaller = waitingfor;
}
return;
}
vBlocks.push_back(pindex);
if (vBlocks.size() == count) {
return;
}
} else if (waitingfor == -1) {
// This is the first already-in-flight block.
waitingfor = mapBlocksInFlight[pindex->GetBlockHash()].first;
}
}
}
}
} // anon namespace
bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats)
{
LOCK(cs_main);
CNodeState* state = State(nodeid);
if (state == NULL)
return false;
stats.nMisbehavior = state->nMisbehavior;
stats.nSyncHeight = state->pindexBestKnownBlock ? state->pindexBestKnownBlock->nHeight : -1;
stats.nCommonHeight = state->pindexLastCommonBlock ? state->pindexLastCommonBlock->nHeight : -1;
BOOST_FOREACH (const QueuedBlock& queue, state->vBlocksInFlight) {
if (queue.pindex)
stats.vHeightInFlight.push_back(queue.pindex->nHeight);
}
return true;
}
void RegisterNodeSignals(CNodeSignals& nodeSignals)
{
nodeSignals.GetHeight.connect(&GetHeight);
nodeSignals.ProcessMessages.connect(&ProcessMessages);
nodeSignals.SendMessages.connect(&SendMessages);
nodeSignals.InitializeNode.connect(&InitializeNode);
nodeSignals.FinalizeNode.connect(&FinalizeNode);
}
void UnregisterNodeSignals(CNodeSignals& nodeSignals)
{
nodeSignals.GetHeight.disconnect(&GetHeight);
nodeSignals.ProcessMessages.disconnect(&ProcessMessages);
nodeSignals.SendMessages.disconnect(&SendMessages);
nodeSignals.InitializeNode.disconnect(&InitializeNode);
nodeSignals.FinalizeNode.disconnect(&FinalizeNode);
}
CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& locator)
{
// Find the first block the caller has in the main chain
BOOST_FOREACH (const uint256& hash, locator.vHave) {
BlockMap::iterator mi = mapBlockIndex.find(hash);
if (mi != mapBlockIndex.end()) {
CBlockIndex* pindex = (*mi).second;
if (chain.Contains(pindex))
return pindex;
}
}
return chain.Genesis();
}
CCoinsViewCache* pcoinsTip = NULL;
CBlockTreeDB* pblocktree = NULL;
CZerocoinDB* zerocoinDB = NULL;
CSporkDB* pSporkDB = NULL;
//////////////////////////////////////////////////////////////////////////////
//
// mapOrphanTransactions
//
bool AddOrphanTx(const CTransaction& tx, NodeId peer)
{
uint256 hash = tx.GetHash();
if (mapOrphanTransactions.count(hash))
return false;
// Ignore big transactions, to avoid a
// send-big-orphans memory exhaustion attack. If a peer has a legitimate
// large transaction with a missing parent then we assume
// it will rebroadcast it later, after the parent transaction(s)
// have been mined or received.
// 10,000 orphans, each of which is at most 5,000 bytes big is
// at most 500 megabytes of orphans:
unsigned int sz = tx.GetSerializeSize(SER_NETWORK, CTransaction::CURRENT_VERSION);
if (sz > 5000) {
LogPrint("mempool", "ignoring large orphan tx (size: %u, hash: %s)\n", sz, hash.ToString());
return false;
}
mapOrphanTransactions[hash].tx = tx;
mapOrphanTransactions[hash].fromPeer = peer;
BOOST_FOREACH (const CTxIn& txin, tx.vin)
mapOrphanTransactionsByPrev[txin.prevout.hash].insert(hash);
LogPrint("mempool", "stored orphan tx %s (mapsz %u prevsz %u)\n", hash.ToString(),
mapOrphanTransactions.size(), mapOrphanTransactionsByPrev.size());
return true;
}
void static EraseOrphanTx(uint256 hash)
{
map<uint256, COrphanTx>::iterator it = mapOrphanTransactions.find(hash);
if (it == mapOrphanTransactions.end())
return;
BOOST_FOREACH (const CTxIn& txin, it->second.tx.vin) {
map<uint256, set<uint256> >::iterator itPrev = mapOrphanTransactionsByPrev.find(txin.prevout.hash);
if (itPrev == mapOrphanTransactionsByPrev.end())
continue;
itPrev->second.erase(hash);
if (itPrev->second.empty())
mapOrphanTransactionsByPrev.erase(itPrev);
}
mapOrphanTransactions.erase(it);
}
void EraseOrphansFor(NodeId peer)
{
int nErased = 0;
map<uint256, COrphanTx>::iterator iter = mapOrphanTransactions.begin();
while (iter != mapOrphanTransactions.end()) {
map<uint256, COrphanTx>::iterator maybeErase = iter++; // increment to avoid iterator becoming invalid
if (maybeErase->second.fromPeer == peer) {
EraseOrphanTx(maybeErase->second.tx.GetHash());
++nErased;
}
}
if (nErased > 0) LogPrint("mempool", "Erased %d orphan tx from peer %d\n", nErased, peer);
}
unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
{
unsigned int nEvicted = 0;
while (mapOrphanTransactions.size() > nMaxOrphans) {
// Evict a random orphan:
uint256 randomhash = GetRandHash();
map<uint256, COrphanTx>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
if (it == mapOrphanTransactions.end())
it = mapOrphanTransactions.begin();
EraseOrphanTx(it->first);
++nEvicted;
}
return nEvicted;
}
bool IsStandardTx(const CTransaction& tx, string& reason)
{
AssertLockHeld(cs_main);
if (tx.nVersion > CTransaction::CURRENT_VERSION || tx.nVersion < 1) {
reason = "version";
return false;
}
// Treat non-final transactions as non-standard to prevent a specific type
// of double-spend attack, as well as DoS attacks. (if the transaction
// can't be mined, the attacker isn't expending resources broadcasting it)
// Basically we don't want to propagate transactions that can't be included in
// the next block.
//
// However, IsFinalTx() is confusing... Without arguments, it uses
// chainActive.Height() to evaluate nLockTime; when a block is accepted, chainActive.Height()
// is set to the value of nHeight in the block. However, when IsFinalTx()
// is called within CBlock::AcceptBlock(), the height of the block *being*
// evaluated is what is used. Thus if we want to know if a transaction can
// be part of the *next* block, we need to call IsFinalTx() with one more
// than chainActive.Height().
//
// Timestamps on the other hand don't get any special treatment, because we
// can't know what timestamp the next block will have, and there aren't
// timestamp applications where it matters.
if (!IsFinalTx(tx, chainActive.Height() + 1)) {
reason = "non-final";
return false;
}
// Extremely large transactions with lots of inputs can cost the network
// almost as much to process as they cost the sender in fees, because
// computing signature hashes is O(ninputs*txsize). Limiting transactions
// to MAX_STANDARD_TX_SIZE mitigates CPU exhaustion attacks.
unsigned int sz = tx.GetSerializeSize(SER_NETWORK, CTransaction::CURRENT_VERSION);
unsigned int nMaxSize = tx.ContainsZerocoins() ? MAX_ZEROCOIN_TX_SIZE : MAX_STANDARD_TX_SIZE;
if (sz >= nMaxSize) {
reason = "tx-size";
return false;
}
for (const CTxIn& txin : tx.vin) {
if (txin.scriptSig.IsZerocoinSpend())
continue;
// Biggest 'standard' txin is a 15-of-15 P2SH multisig with compressed
// keys. (remember the 520 byte limit on redeemScript size) That works
// out to a (15*(33+1))+3=513 byte redeemScript, 513+1+15*(73+1)+3=1627
// bytes of scriptSig, which we round off to 1650 bytes for some minor
// future-proofing. That's also enough to spend a 20-of-20
// CHECKMULTISIG scriptPubKey, though such a scriptPubKey is not
// considered standard)
if (txin.scriptSig.size() > 1650) {
reason = "scriptsig-size";
return false;
}
if (!txin.scriptSig.IsPushOnly()) {
reason = "scriptsig-not-pushonly";
return false;
}
}
unsigned int nDataOut = 0;
txnouttype whichType;
BOOST_FOREACH (const CTxOut& txout, tx.vout) {
if (!::IsStandard(txout.scriptPubKey, whichType)) {
reason = "scriptpubkey";
return false;
}
if (whichType == TX_NULL_DATA)
nDataOut++;
else if ((whichType == TX_MULTISIG) && (!fIsBareMultisigStd)) {
reason = "bare-multisig";
return false;
} else if (txout.IsDust(::minRelayTxFee)) {
reason = "dust";
return false;
}
}
// only one OP_RETURN txout is permitted
if (nDataOut > 1) {
reason = "multi-op-return";
return false;
}
return true;
}
bool IsFinalTx(const CTransaction& tx, int nBlockHeight, int64_t nBlockTime)
{
AssertLockHeld(cs_main);
// Time based nLockTime implemented in 0.1.6
if (tx.nLockTime == 0)
return true;
if (nBlockHeight == 0)
nBlockHeight = chainActive.Height();
if (nBlockTime == 0)
nBlockTime = GetAdjustedTime();
if ((int64_t)tx.nLockTime < ((int64_t)tx.nLockTime < LOCKTIME_THRESHOLD ? (int64_t)nBlockHeight : nBlockTime))
return true;
BOOST_FOREACH (const CTxIn& txin, tx.vin)
if (!txin.IsFinal())
return false;
return true;
}
/**
* Check transaction inputs to mitigate two
* potential denial-of-service attacks:
*
* 1. scriptSigs with extra data stuffed into them,
* not consumed by scriptPubKey (or P2SH script)
* 2. P2SH scripts with a crazy number of expensive
* CHECKSIG/CHECKMULTISIG operations
*/
bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
{
if (tx.IsCoinBase() || tx.IsZerocoinSpend())
return true; // coinbase has no inputs and zerocoinspend has a special input
//todo should there be a check for a 'standard' zerocoinspend here?
for (unsigned int i = 0; i < tx.vin.size(); i++) {
const CTxOut& prev = mapInputs.GetOutputFor(tx.vin[i]);
vector<vector<unsigned char> > vSolutions;
txnouttype whichType;
// get the scriptPubKey corresponding to this input:
const CScript& prevScript = prev.scriptPubKey;
if (!Solver(prevScript, whichType, vSolutions))
return false;
int nArgsExpected = ScriptSigArgsExpected(whichType, vSolutions);
if (nArgsExpected < 0)
return false;
// Transactions with extra stuff in their scriptSigs are
// non-standard. Note that this EvalScript() call will
// be quick, because if there are any operations
// beside "push data" in the scriptSig
// IsStandard() will have already returned false
// and this method isn't called.
vector<vector<unsigned char> > stack;
if (!EvalScript(stack, tx.vin[i].scriptSig, false, BaseSignatureChecker()))
return false;
if (whichType == TX_SCRIPTHASH) {
if (stack.empty())
return false;
CScript subscript(stack.back().begin(), stack.back().end());
vector<vector<unsigned char> > vSolutions2;
txnouttype whichType2;
if (Solver(subscript, whichType2, vSolutions2)) {
int tmpExpected = ScriptSigArgsExpected(whichType2, vSolutions2);
if (tmpExpected < 0)
return false;
nArgsExpected += tmpExpected;
} else {
// Any other Script with less than 15 sigops OK:
unsigned int sigops = subscript.GetSigOpCount(true);
// ... extra data left on the stack after execution is OK, too:
return (sigops <= MAX_P2SH_SIGOPS);
}
}
if (stack.size() != (unsigned int)nArgsExpected)
return false;
}
return true;
}
unsigned int GetLegacySigOpCount(const CTransaction& tx)
{
unsigned int nSigOps = 0;
BOOST_FOREACH (const CTxIn& txin, tx.vin) {
nSigOps += txin.scriptSig.GetSigOpCount(false);
}
BOOST_FOREACH (const CTxOut& txout, tx.vout) {
nSigOps += txout.scriptPubKey.GetSigOpCount(false);
}
return nSigOps;
}
unsigned int GetP2SHSigOpCount(const CTransaction& tx, const CCoinsViewCache& inputs)
{
if (tx.IsCoinBase() || tx.IsZerocoinSpend())
return 0;
unsigned int nSigOps = 0;
for (unsigned int i = 0; i < tx.vin.size(); i++) {
const CTxOut& prevout = inputs.GetOutputFor(tx.vin[i]);
if (prevout.scriptPubKey.IsPayToScriptHash())
nSigOps += prevout.scriptPubKey.GetSigOpCount(tx.vin[i].scriptSig);
}
return nSigOps;
}
int GetInputAge(CTxIn& vin)
{
CCoinsView viewDummy;
CCoinsViewCache view(&viewDummy);
{
LOCK(mempool.cs);
CCoinsViewMemPool viewMempool(pcoinsTip, mempool);
view.SetBackend(viewMempool); // temporarily switch cache backend to db+mempool view
const CCoins* coins = view.AccessCoins(vin.prevout.hash);
if (coins) {
if (coins->nHeight < 0) return 0;
return (chainActive.Tip()->nHeight + 1) - coins->nHeight;
} else
return -1;
}
}
int GetInputAgeIX(uint256 nTXHash, CTxIn& vin)
{
int sigs = 0;
int nResult = GetInputAge(vin);
if (nResult < 0) nResult = 0;
if (nResult < 6) {
std::map<uint256, CTransactionLock>::iterator i = mapTxLocks.find(nTXHash);
if (i != mapTxLocks.end()) {
sigs = (*i).second.CountSignatures();
}
if (sigs >= SWIFTTX_SIGNATURES_REQUIRED) {
return nSwiftTXDepth + nResult;
}
}
return -1;
}
int GetIXConfirmations(uint256 nTXHash)
{
int sigs = 0;
std::map<uint256, CTransactionLock>::iterator i = mapTxLocks.find(nTXHash);
if (i != mapTxLocks.end()) {
sigs = (*i).second.CountSignatures();
}
if (sigs >= SWIFTTX_SIGNATURES_REQUIRED) {
return nSwiftTXDepth;
}
return 0;
}
bool MoneyRange(CAmount nValueOut)
{
return nValueOut >= 0 && nValueOut <= Params().MaxMoneyOut();
}
bool CheckZerocoinMint(const uint256& txHash, const CTxOut& txout, CValidationState& state, bool fCheckOnly)
{
PublicCoin pubCoin(Params().Zerocoin_Params(false));
if(!TxOutToPublicCoin(txout, pubCoin, state))
return state.DoS(100, error("CheckZerocoinMint(): TxOutToPublicCoin() failed"));
if (!pubCoin.validate())
return state.DoS(100, error("CheckZerocoinMint() : PubCoin does not validate"));
return true;
}
bool ContextualCheckZerocoinMint(const CTransaction& tx, const PublicCoin& coin, const CBlockIndex* pindex)
{
if (pindex->nHeight >= Params().Zerocoin_Block_V2_Start() && Params().NetworkID() != CBaseChainParams::TESTNET) {
//See if this coin has already been added to the blockchain
uint256 txid;
int nHeight;
if (zerocoinDB->ReadCoinMint(coin.getValue(), txid) && IsTransactionInChain(txid, nHeight))
return error("%s: pubcoin %s was already accumulated in tx %s", __func__,
coin.getValue().GetHex().substr(0, 10),
txid.GetHex());
}
return true;
}
bool ContextualCheckZerocoinSpend(const CTransaction& tx, const CoinSpend& spend, CBlockIndex* pindex, const uint256& hashBlock)
{
if(!ContextualCheckZerocoinSpendNoSerialCheck(tx, spend, pindex, hashBlock)){
return false;
}
//Reject serial's that are already in the blockchain
int nHeightTx = 0;
if (IsSerialInBlockchain(spend.getCoinSerialNumber(), nHeightTx))
return error("%s : zTWINS spend with serial %s is already in block %d\n", __func__,
spend.getCoinSerialNumber().GetHex(), nHeightTx);