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privatesend.cpp
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privatesend.cpp
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// Copyright (c) 2014-2017 The Dash Core developers
// Copyright (c) 2018 The Absolute Core developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "privatesend.h"
#include "activemasternode.h"
#include "consensus/validation.h"
#include "governance.h"
#include "init.h"
#include "instantx.h"
#include "masternode-payments.h"
#include "masternode-sync.h"
#include "masternodeman.h"
#include "messagesigner.h"
#include "netmessagemaker.h"
#include "script/sign.h"
#include "txmempool.h"
#include "util.h"
#include "utilmoneystr.h"
#include <boost/lexical_cast.hpp>
bool CDarkSendEntry::AddScriptSig(const CTxIn& txin)
{
BOOST_FOREACH(CTxDSIn& txdsin, vecTxDSIn) {
if(txdsin.prevout == txin.prevout && txdsin.nSequence == txin.nSequence) {
if(txdsin.fHasSig) return false;
txdsin.scriptSig = txin.scriptSig;
txdsin.fHasSig = true;
return true;
}
}
return false;
}
bool CDarksendQueue::Sign()
{
if(!fMasterNode) return false;
std::string strMessage = vin.ToString() + boost::lexical_cast<std::string>(nDenom) + boost::lexical_cast<std::string>(nTime) + boost::lexical_cast<std::string>(fReady);
if(!CMessageSigner::SignMessage(strMessage, vchSig, activeMasternode.keyMasternode)) {
LogPrintf("CDarksendQueue::Sign -- SignMessage() failed, %s\n", ToString());
return false;
}
return CheckSignature(activeMasternode.pubKeyMasternode);
}
bool CDarksendQueue::CheckSignature(const CPubKey& pubKeyMasternode)
{
std::string strMessage = vin.ToString() + boost::lexical_cast<std::string>(nDenom) + boost::lexical_cast<std::string>(nTime) + boost::lexical_cast<std::string>(fReady);
std::string strError = "";
if(!CMessageSigner::VerifyMessage(pubKeyMasternode, vchSig, strMessage, strError)) {
LogPrintf("CDarksendQueue::CheckSignature -- Got bad Masternode queue signature: %s; error: %s\n", ToString(), strError);
return false;
}
return true;
}
bool CDarksendQueue::Relay(CConnman& connman)
{
std::vector<CNode*> vNodesCopy = connman.CopyNodeVector();
BOOST_FOREACH(CNode* pnode, vNodesCopy) {
CNetMsgMaker msgMaker(pnode->GetSendVersion());
if (pnode->nVersion >= MIN_PRIVATESEND_PEER_PROTO_VERSION)
connman.PushMessage(pnode, msgMaker.Make(NetMsgType::DSQUEUE, (*this)));
}
connman.ReleaseNodeVector(vNodesCopy);
return true;
}
bool CDarksendBroadcastTx::Sign()
{
if(!fMasterNode) return false;
std::string strMessage = tx.GetHash().ToString() + boost::lexical_cast<std::string>(sigTime);
if(!CMessageSigner::SignMessage(strMessage, vchSig, activeMasternode.keyMasternode)) {
LogPrintf("CDarksendBroadcastTx::Sign -- SignMessage() failed\n");
return false;
}
return CheckSignature(activeMasternode.pubKeyMasternode);
}
bool CDarksendBroadcastTx::CheckSignature(const CPubKey& pubKeyMasternode)
{
std::string strMessage = tx.GetHash().ToString() + boost::lexical_cast<std::string>(sigTime);
std::string strError = "";
if(!CMessageSigner::VerifyMessage(pubKeyMasternode, vchSig, strMessage, strError)) {
LogPrintf("CDarksendBroadcastTx::CheckSignature -- Got bad dstx signature, error: %s\n", strError);
return false;
}
return true;
}
bool CDarksendBroadcastTx::IsExpired(int nHeight)
{
// expire confirmed DSTXes after ~1h since confirmation
return (nConfirmedHeight != -1) && (nHeight - nConfirmedHeight > 24);
}
void CPrivateSendBase::SetNull()
{
// Both sides
nState = POOL_STATE_IDLE;
nSessionID = 0;
nSessionDenom = 0;
vecEntries.clear();
finalMutableTransaction.vin.clear();
finalMutableTransaction.vout.clear();
nTimeLastSuccessfulStep = GetTimeMillis();
}
void CPrivateSendBase::CheckQueue()
{
TRY_LOCK(cs_darksend, lockDS);
if(!lockDS) return; // it's ok to fail here, we run this quite frequently
// check mixing queue objects for timeouts
std::vector<CDarksendQueue>::iterator it = vecDarksendQueue.begin();
while(it != vecDarksendQueue.end()) {
if((*it).IsExpired()) {
LogPrint("privatesend", "CPrivateSendBase::%s -- Removing expired queue (%s)\n", __func__, (*it).ToString());
it = vecDarksendQueue.erase(it);
} else ++it;
}
}
std::string CPrivateSendBase::GetStateString() const
{
switch(nState) {
case POOL_STATE_IDLE: return "IDLE";
case POOL_STATE_QUEUE: return "QUEUE";
case POOL_STATE_ACCEPTING_ENTRIES: return "ACCEPTING_ENTRIES";
case POOL_STATE_SIGNING: return "SIGNING";
case POOL_STATE_ERROR: return "ERROR";
case POOL_STATE_SUCCESS: return "SUCCESS";
default: return "UNKNOWN";
}
}
// Definitions for static data members
std::vector<CAmount> CPrivateSend::vecStandardDenominations;
std::map<uint256, CDarksendBroadcastTx> CPrivateSend::mapDSTX;
CCriticalSection CPrivateSend::cs_mapdstx;
void CPrivateSend::InitStandardDenominations()
{
vecStandardDenominations.clear();
/* Denominations
A note about convertability. Within mixing pools, each denomination
is convertable to another.
For example:
1DRK+1000 == (.1DRK+100)*10
10DRK+10000 == (1DRK+1000)*10
*/
/* Disabled
vecStandardDenominations.push_back( (100 * COIN)+100000 );
*/
vecStandardDenominations.push_back( (10 * COIN)+10000 );
vecStandardDenominations.push_back( (1 * COIN)+1000 );
vecStandardDenominations.push_back( (.1 * COIN)+100 );
vecStandardDenominations.push_back( (.01 * COIN)+10 );
/* Disabled till we need them
vecStandardDenominations.push_back( (.001 * COIN)+1 );
*/
}
// check to make sure the collateral provided by the client is valid
bool CPrivateSend::IsCollateralValid(const CTransaction& txCollateral)
{
if(txCollateral.vout.empty()) return false;
if(txCollateral.nLockTime != 0) return false;
CAmount nValueIn = 0;
CAmount nValueOut = 0;
BOOST_FOREACH(const CTxOut txout, txCollateral.vout) {
nValueOut += txout.nValue;
if(!txout.scriptPubKey.IsPayToPublicKeyHash()) {
LogPrintf ("CPrivateSend::IsCollateralValid -- Invalid Script, txCollateral=%s", txCollateral.ToString());
return false;
}
}
BOOST_FOREACH(const CTxIn txin, txCollateral.vin) {
Coin coin;
if(!GetUTXOCoin(txin.prevout, coin)) {
LogPrint("privatesend", "CPrivateSend::IsCollateralValid -- Unknown inputs in collateral transaction, txCollateral=%s", txCollateral.ToString());
return false;
}
nValueIn += coin.out.nValue;
}
//collateral transactions are required to pay out a small fee to the miners
if(nValueIn - nValueOut < GetCollateralAmount()) {
LogPrint("privatesend", "CPrivateSend::IsCollateralValid -- did not include enough fees in transaction: fees: %d, txCollateral=%s", nValueOut - nValueIn, txCollateral.ToString());
return false;
}
LogPrint("privatesend", "CPrivateSend::IsCollateralValid -- %s", txCollateral.ToString());
{
LOCK(cs_main);
CValidationState validationState;
if(!AcceptToMemoryPool(mempool, validationState, MakeTransactionRef(txCollateral), false, NULL, false, maxTxFee, true)) {
LogPrint("privatesend", "CPrivateSend::IsCollateralValid -- didn't pass AcceptToMemoryPool()\n");
return false;
}
}
return true;
}
bool CPrivateSend::IsCollateralAmount(CAmount nInputAmount)
{
// collateral inputs should always be a 2x..4x of mixing collateral
return nInputAmount > GetCollateralAmount() &&
nInputAmount <= GetMaxCollateralAmount() &&
nInputAmount % GetCollateralAmount() == 0;
}
/* Create a nice string to show the denominations
Function returns as follows (for 4 denominations):
( bit on if present )
bit 0 - 100
bit 1 - 10
bit 2 - 1
bit 3 - .1
bit 4 and so on - out-of-bounds
none of above - non-denom
*/
std::string CPrivateSend::GetDenominationsToString(int nDenom)
{
std::string strDenom = "";
int nMaxDenoms = vecStandardDenominations.size();
if(nDenom >= (1 << nMaxDenoms)) {
return "out-of-bounds";
}
for (int i = 0; i < nMaxDenoms; ++i) {
if(nDenom & (1 << i)) {
strDenom += (strDenom.empty() ? "" : "+") + FormatMoney(vecStandardDenominations[i]);
}
}
if(strDenom.empty()) {
return "non-denom";
}
return strDenom;
}
/* Return a bitshifted integer representing the denominations in this list
Function returns as follows (for 4 denominations):
( bit on if present )
100 - bit 0
10 - bit 1
1 - bit 2
.1 - bit 3
non-denom - 0, all bits off
*/
int CPrivateSend::GetDenominations(const std::vector<CTxOut>& vecTxOut, bool fSingleRandomDenom)
{
std::vector<std::pair<CAmount, int> > vecDenomUsed;
// make a list of denominations, with zero uses
BOOST_FOREACH(CAmount nDenomValue, vecStandardDenominations)
vecDenomUsed.push_back(std::make_pair(nDenomValue, 0));
// look for denominations and update uses to 1
BOOST_FOREACH(CTxOut txout, vecTxOut) {
bool found = false;
BOOST_FOREACH (PAIRTYPE(CAmount, int)& s, vecDenomUsed) {
if(txout.nValue == s.first) {
s.second = 1;
found = true;
}
}
if(!found) return 0;
}
int nDenom = 0;
int c = 0;
// if the denomination is used, shift the bit on
BOOST_FOREACH (PAIRTYPE(CAmount, int)& s, vecDenomUsed) {
int bit = (fSingleRandomDenom ? GetRandInt(2) : 1) & s.second;
nDenom |= bit << c++;
if(fSingleRandomDenom && bit) break; // use just one random denomination
}
return nDenom;
}
bool CPrivateSend::GetDenominationsBits(int nDenom, std::vector<int> &vecBitsRet)
{
// ( bit on if present, 4 denominations example )
// bit 0 - 100ABSOLUTE+1
// bit 1 - 10ABSOLUTE+1
// bit 2 - 1ABSOLUTE+1
// bit 3 - .1ABSOLUTE+1
int nMaxDenoms = vecStandardDenominations.size();
if(nDenom >= (1 << nMaxDenoms)) return false;
vecBitsRet.clear();
for (int i = 0; i < nMaxDenoms; ++i) {
if(nDenom & (1 << i)) {
vecBitsRet.push_back(i);
}
}
return !vecBitsRet.empty();
}
int CPrivateSend::GetDenominationsByAmounts(const std::vector<CAmount>& vecAmount)
{
CScript scriptTmp = CScript();
std::vector<CTxOut> vecTxOut;
BOOST_REVERSE_FOREACH(CAmount nAmount, vecAmount) {
CTxOut txout(nAmount, scriptTmp);
vecTxOut.push_back(txout);
}
return GetDenominations(vecTxOut, true);
}
bool CPrivateSend::IsDenominatedAmount(CAmount nInputAmount)
{
for (const auto& nDenomValue : vecStandardDenominations)
if(nInputAmount == nDenomValue)
return true;
return false;
}
std::string CPrivateSend::GetMessageByID(PoolMessage nMessageID)
{
switch (nMessageID) {
case ERR_ALREADY_HAVE: return _("Already have that input.");
case ERR_DENOM: return _("No matching denominations found for mixing.");
case ERR_ENTRIES_FULL: return _("Entries are full.");
case ERR_EXISTING_TX: return _("Not compatible with existing transactions.");
case ERR_FEES: return _("Transaction fees are too high.");
case ERR_INVALID_COLLATERAL: return _("Collateral not valid.");
case ERR_INVALID_INPUT: return _("Input is not valid.");
case ERR_INVALID_SCRIPT: return _("Invalid script detected.");
case ERR_INVALID_TX: return _("Transaction not valid.");
case ERR_MAXIMUM: return _("Entry exceeds maximum size.");
case ERR_MN_LIST: return _("Not in the Masternode list.");
case ERR_MODE: return _("Incompatible mode.");
case ERR_NON_STANDARD_PUBKEY: return _("Non-standard public key detected.");
case ERR_NOT_A_MN: return _("This is not a Masternode."); // not used
case ERR_QUEUE_FULL: return _("Masternode queue is full.");
case ERR_RECENT: return _("Last PrivateSend was too recent.");
case ERR_SESSION: return _("Session not complete!");
case ERR_MISSING_TX: return _("Missing input transaction information.");
case ERR_VERSION: return _("Incompatible version.");
case MSG_NOERR: return _("No errors detected.");
case MSG_SUCCESS: return _("Transaction created successfully.");
case MSG_ENTRIES_ADDED: return _("Your entries added successfully.");
default: return _("Unknown response.");
}
}
void CPrivateSend::AddDSTX(const CDarksendBroadcastTx& dstx)
{
LOCK(cs_mapdstx);
mapDSTX.insert(std::make_pair(dstx.tx.GetHash(), dstx));
}
CDarksendBroadcastTx CPrivateSend::GetDSTX(const uint256& hash)
{
LOCK(cs_mapdstx);
auto it = mapDSTX.find(hash);
return (it == mapDSTX.end()) ? CDarksendBroadcastTx() : it->second;
}
void CPrivateSend::CheckDSTXes(int nHeight)
{
LOCK(cs_mapdstx);
std::map<uint256, CDarksendBroadcastTx>::iterator it = mapDSTX.begin();
while(it != mapDSTX.end()) {
if (it->second.IsExpired(nHeight)) {
mapDSTX.erase(it++);
} else {
++it;
}
}
LogPrint("privatesend", "CPrivateSend::CheckDSTXes -- mapDSTX.size()=%llu\n", mapDSTX.size());
}
void CPrivateSend::UpdatedBlockTip(const CBlockIndex *pindex)
{
if(pindex && !fLiteMode && masternodeSync.IsMasternodeListSynced()) {
CheckDSTXes(pindex->nHeight);
}
}
void CPrivateSend::SyncTransaction(const CTransaction& tx, const CBlockIndex *pindex, int posInBlock)
{
if (tx.IsCoinBase()) return;
LOCK2(cs_main, cs_mapdstx);
uint256 txHash = tx.GetHash();
if (!mapDSTX.count(txHash)) return;
// When tx is 0-confirmed or conflicted, posInBlock is SYNC_TRANSACTION_NOT_IN_BLOCK and nConfirmedHeight should be set to -1
mapDSTX[txHash].SetConfirmedHeight(posInBlock == CMainSignals::SYNC_TRANSACTION_NOT_IN_BLOCK ? -1 : pindex->nHeight);
LogPrint("privatesend", "CPrivateSendClient::SyncTransaction -- txid=%s\n", txHash.ToString());
}
//TODO: Rename/move to core
void ThreadCheckPrivateSend(CConnman& connman)
{
if(fLiteMode) return; // disable all Absolute specific functionality
static bool fOneThread;
if(fOneThread) return;
fOneThread = true;
// Make this thread recognisable as the PrivateSend thread
RenameThread("absolute-ps");
unsigned int nTick = 0;
while (true)
{
MilliSleep(1000);
// try to sync from all available nodes, one step at a time
masternodeSync.ProcessTick(connman);
if(masternodeSync.IsBlockchainSynced() && !ShutdownRequested()) {
nTick++;
// make sure to check all masternodes first
mnodeman.Check();
// check if we should activate or ping every few minutes,
// slightly postpone first run to give net thread a chance to connect to some peers
if(nTick % MASTERNODE_MIN_MNP_SECONDS == 15)
activeMasternode.ManageState(connman);
if(nTick % 60 == 0) {
mnodeman.ProcessMasternodeConnections(connman);
mnodeman.CheckAndRemove(connman);
mnpayments.CheckAndRemove();
instantsend.CheckAndRemove();
}
if(fMasterNode && (nTick % (60 * 5) == 0)) {
mnodeman.DoFullVerificationStep(connman);
}
if(nTick % (60 * 5) == 0) {
governance.DoMaintenance(connman);
}
}
}
}