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darksend.cpp
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2210 lines (1786 loc) · 79.4 KB
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// Copyright (c) 2014-2015 The Darkcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "darksend.h"
#include "main.h"
#include "init.h"
//#include "script/sign.h"
#include "util.h"
#include "masternode.h"
#include "instantx.h"
#include "ui_interface.h"
//#include "random.h"
#include <openssl/rand.h>
#include <boost/algorithm/string/replace.hpp>
#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>
#include <boost/lexical_cast.hpp>
#include <algorithm>
#include <boost/assign/list_of.hpp>
using namespace std;
using namespace boost;
CCriticalSection cs_darksend;
/** The main object for accessing darksend */
CDarkSendPool darkSendPool;
/** A helper object for signing messages from masternodes */
CDarkSendSigner darkSendSigner;
/** The current darksends in progress on the network */
std::vector<CDarksendQueue> vecDarksendQueue;
/** Keep track of the used masternodes */
std::vector<CTxIn> vecMasternodesUsed;
// keep track of the scanning errors I've seen
map<uint256, CDarksendBroadcastTx> mapDarksendBroadcastTxes;
//
CActiveMasternode activeMasternode;
// count peers we've requested the list from
int RequestedMasterNodeList = 0;
/* *** BEGIN DARKSEND MAGIC **********
Copyright 2014, Darkcoin Developers
eduffield - [email protected]
*/
void ProcessMessageDarksend(CNode* pfrom, std::string& strCommand, CDataStream& vRecv)
{
if(fLiteMode) return; //disable all darksend/masternode related functionality
if (strCommand == "dsf") { //DarkSend Final tx
if (pfrom->nVersion < darkSendPool.MIN_PEER_PROTO_VERSION) {
return;
}
if((CNetAddr)darkSendPool.submittedToMasternode != (CNetAddr)pfrom->addr){
//LogPrintf("dsc - message doesn't match current masternode - %s != %s\n", darkSendPool.submittedToMasternode.ToString().c_str(), pfrom->addr.ToString().c_str());
return;
}
int sessionID;
CTransaction txNew;
vRecv >> sessionID >> txNew;
if(darkSendPool.sessionID != sessionID){
if (fDebug) LogPrintf("dsf - message doesn't match current darksend session %d %d\n", darkSendPool.sessionID, sessionID);
return;
}
//check to see if input is spent already? (and probably not confirmed)
darkSendPool.SignFinalTransaction(txNew, pfrom);
}
else if (strCommand == "dsc") { //DarkSend Complete
if (pfrom->nVersion < darkSendPool.MIN_PEER_PROTO_VERSION) {
return;
}
if((CNetAddr)darkSendPool.submittedToMasternode != (CNetAddr)pfrom->addr){
//LogPrintf("dsc - message doesn't match current masternode - %s != %s\n", darkSendPool.submittedToMasternode.ToString().c_str(), pfrom->addr.ToString().c_str());
return;
}
int sessionID;
bool error;
std::string lastMessage;
vRecv >> sessionID >> error >> lastMessage;
if(darkSendPool.sessionID != sessionID){
if (fDebug) LogPrintf("dsc - message doesn't match current darksend session %d %d\n", darkSendPool.sessionID, sessionID);
return;
}
darkSendPool.CompletedTransaction(error, lastMessage);
}
else if (strCommand == "dsa") { //DarkSend Acceptable
if (pfrom->nVersion < darkSendPool.MIN_PEER_PROTO_VERSION) {
std::string strError = _("Incompatible version.");
LogPrintf("dsa -- incompatible version! \n");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, strError);
return;
}
if(!fMasterNode){
std::string strError = _("This is not a masternode.");
LogPrintf("dsa -- not a masternode! \n");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, strError);
return;
}
int nDenom;
CTransaction txCollateral;
vRecv >> nDenom >> txCollateral;
std::string error = "";
int mn = GetMasternodeByVin(activeMasternode.vin);
if(mn == -1){
std::string strError = _("Not in the masternode list.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, strError);
return;
}
if(darkSendPool.sessionUsers == 0) {
if(vecMasternodes[mn].nLastDsq != 0 &&
vecMasternodes[mn].nLastDsq + CountMasternodesAboveProtocol(darkSendPool.MIN_PEER_PROTO_VERSION)/5 > darkSendPool.nDsqCount){
//LogPrintf("dsa -- last dsq too recent, must wait. %s \n", vecMasternodes[mn].addr.ToString().c_str());
std::string strError = _("Last Darksend was too recent.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, strError);
return;
}
}
if(!darkSendPool.IsCompatibleWithSession(nDenom, txCollateral, error))
{
LogPrintf("dsa -- not compatible with existing transactions! \n");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
} else {
LogPrintf("dsa -- is compatible, please submit! \n");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_ACCEPTED, error);
return;
}
} else if (strCommand == "dsq") { //DarkSend Queue
if (pfrom->nVersion < darkSendPool.MIN_PEER_PROTO_VERSION) {
return;
}
CDarksendQueue dsq;
vRecv >> dsq;
CService addr;
if(!dsq.GetAddress(addr)) return;
if(!dsq.CheckSignature()) return;
if(dsq.IsExpired()) return;
int mn = GetMasternodeByVin(dsq.vin);
if(mn == -1) return;
// if the queue is ready, submit if we can
if(dsq.ready) {
if((CNetAddr)darkSendPool.submittedToMasternode != (CNetAddr)addr){
LogPrintf("dsq - message doesn't match current masternode - %s != %s\n", darkSendPool.submittedToMasternode.ToString().c_str(), pfrom->addr.ToString().c_str());
return;
}
if (fDebug) LogPrintf("darksend queue is ready - %s\n", addr.ToString().c_str());
darkSendPool.PrepareDarksendDenominate();
} else {
BOOST_FOREACH(CDarksendQueue q, vecDarksendQueue){
if(q.vin == dsq.vin) return;
}
if(fDebug) LogPrintf("dsq last %d last2 %d count %d\n", vecMasternodes[mn].nLastDsq, vecMasternodes[mn].nLastDsq + (int)vecMasternodes.size()/5, darkSendPool.nDsqCount);
//don't allow a few nodes to dominate the queuing process
if(vecMasternodes[mn].nLastDsq != 0 &&
vecMasternodes[mn].nLastDsq + CountMasternodesAboveProtocol(darkSendPool.MIN_PEER_PROTO_VERSION)/5 > darkSendPool.nDsqCount){
if(fDebug) LogPrintf("dsq -- masternode sending too many dsq messages. %s \n", vecMasternodes[mn].addr.ToString().c_str());
return;
}
darkSendPool.nDsqCount++;
vecMasternodes[mn].nLastDsq = darkSendPool.nDsqCount;
vecMasternodes[mn].allowFreeTx = true;
if(fDebug) LogPrintf("dsq - new darksend queue object - %s\n", addr.ToString().c_str());
vecDarksendQueue.push_back(dsq);
dsq.Relay();
dsq.time = GetTime();
}
} else if (strCommand == "dsi") { //DarkSend vIn
std::string error = "";
if (pfrom->nVersion < darkSendPool.MIN_PEER_PROTO_VERSION) {
LogPrintf("dsi -- incompatible version! \n");
error = _("Incompatible version.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
if(!fMasterNode){
LogPrintf("dsi -- not a masternode! \n");
error = _("This is not a masternode.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
std::vector<CTxIn> in;
int64_t nAmount;
CTransaction txCollateral;
std::vector<CTxOut> out;
vRecv >> in >> nAmount >> txCollateral >> out;
//do we have enough users in the current session?
if(!darkSendPool.IsSessionReady()){
LogPrintf("dsi -- session not complete! \n");
error = _("Session not complete!");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
//do we have the same denominations as the current session?
if(!darkSendPool.IsCompatibleWithEntries(out))
{
LogPrintf("dsi -- not compatible with existing transactions! \n");
error = _("Not compatible with existing transactions.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
//check it like a transaction
{
int64_t nValueIn = 0;
int64_t nValueOut = 0;
bool missingTx = false;
CValidationState state;
CTransaction tx;
BOOST_FOREACH(CTxOut o, out){
nValueOut += o.nValue;
tx.vout.push_back(o);
if(o.scriptPubKey.size() != 25){
LogPrintf("dsi - non-standard pubkey detected! %s\n", o.scriptPubKey.ToString().c_str());
error = _("Non-standard public key detected.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
if(!o.scriptPubKey.IsNormalPaymentScript()){
LogPrintf("dsi - invalid script! %s\n", o.scriptPubKey.ToString().c_str());
error = _("Invalid script detected.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
}
BOOST_FOREACH(const CTxIn i, in){
tx.vin.push_back(i);
if(fDebug) LogPrintf("dsi -- tx in %s\n", i.ToString().c_str());
CTransaction tx2;
uint256 hash;
//if(GetTransaction(i.prevout.hash, tx2, hash, true)){
if(GetTransaction(i.prevout.hash, tx2, hash)){
if(tx2.vout.size() > i.prevout.n) {
nValueIn += tx2.vout[i.prevout.n].nValue;
}
} else{
missingTx = true;
}
}
if (nValueIn > DARKSEND_POOL_MAX) {
LogPrintf("dsi -- more than darksend pool max! %s\n", tx.ToString().c_str());
error = _("Value more than Darksend pool maximum allows.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
if(!missingTx){
if (nValueIn-nValueOut > nValueIn*.01) {
LogPrintf("dsi -- fees are too high! %s\n", tx.ToString().c_str());
error = _("Transaction fees are too high.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
} else {
LogPrintf("dsi -- missing input tx! %s\n", tx.ToString().c_str());
error = _("Missing input transaction information.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
//if(!AcceptableInputs(mempool, state, tx)){
bool* pfMissingInputs;
if(!AcceptableInputs(mempool, tx, false, pfMissingInputs)){
LogPrintf("dsi -- transaction not valid! \n");
error = _("Transaction not valid.");
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
}
if(darkSendPool.AddEntry(in, nAmount, txCollateral, out, error)){
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_ACCEPTED, error);
darkSendPool.Check();
RelayDarkSendStatus(darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_RESET);
} else {
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_REJECTED, error);
}
}
else if (strCommand == "dssub") { //DarkSend Subscribe To
if (pfrom->nVersion < darkSendPool.MIN_PEER_PROTO_VERSION) {
return;
}
if(!fMasterNode) return;
std::string error = "";
pfrom->PushMessage("dssu", darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_RESET, error);
return;
}
else if (strCommand == "dssu") { //DarkSend status update
if (pfrom->nVersion < darkSendPool.MIN_PEER_PROTO_VERSION) {
return;
}
if((CNetAddr)darkSendPool.submittedToMasternode != (CNetAddr)pfrom->addr){
//LogPrintf("dssu - message doesn't match current masternode - %s != %s\n", darkSendPool.submittedToMasternode.ToString().c_str(), pfrom->addr.ToString().c_str());
return;
}
int sessionID;
int state;
int entriesCount;
int accepted;
std::string error;
vRecv >> sessionID >> state >> entriesCount >> accepted >> error;
if(fDebug) LogPrintf("dssu - state: %i entriesCount: %i accepted: %i error: %s \n", state, entriesCount, accepted, error.c_str());
if((accepted != 1 && accepted != 0) && darkSendPool.sessionID != sessionID){
LogPrintf("dssu - message doesn't match current darksend session %d %d\n", darkSendPool.sessionID, sessionID);
return;
}
darkSendPool.StatusUpdate(state, entriesCount, accepted, error, sessionID);
}
else if (strCommand == "dss") { //DarkSend Sign Final Tx
if (pfrom->nVersion < darkSendPool.MIN_PEER_PROTO_VERSION) {
return;
}
vector<CTxIn> sigs;
vRecv >> sigs;
bool success = false;
int count = 0;
LogPrintf(" -- sigs count %d %d\n", (int)sigs.size(), count);
BOOST_FOREACH(const CTxIn item, sigs)
{
if(darkSendPool.AddScriptSig(item)) success = true;
if(fDebug) LogPrintf(" -- sigs count %d %d\n", (int)sigs.size(), count);
count++;
}
if(success){
darkSendPool.Check();
RelayDarkSendStatus(darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_RESET);
}
}
}
int randomizeList (int i) { return std::rand()%i;}
// Recursively determine the rounds of a given input (How deep is the darksend chain for a given input)
int GetInputDarksendRounds(CTxIn in, int rounds)
{
if(rounds >= 17) return rounds;
std::string padding = "";
padding.insert(0, ((rounds+1)*5)+3, ' ');
CWalletTx tx;
if(pwalletMain->GetTransaction(in.prevout.hash,tx))
{
// bounds check
if(in.prevout.n >= tx.vout.size()) return -4;
if(tx.vout[in.prevout.n].nValue == DARKSEND_FEE) return -3;
//make sure the final output is non-denominate
if(rounds == 0 && !pwalletMain->IsDenominatedAmount(tx.vout[in.prevout.n].nValue)) return -2; //NOT DENOM
bool found = false;
BOOST_FOREACH(CTxOut out, tx.vout)
{
found = pwalletMain->IsDenominatedAmount(out.nValue);
if(found) break; // no need to loop more
}
if(!found) return rounds - 1; //NOT FOUND, "-1" because of the pre-mixing creation of denominated amounts
// find my vin and look that up
BOOST_FOREACH(CTxIn in2, tx.vin)
{
if(pwalletMain->IsMine(in2))
{
//LogPrintf("rounds :: %s %s %d NEXT\n", padding.c_str(), in.ToString().c_str(), rounds);
int n = GetInputDarksendRounds(in2, rounds+1);
if(n != -3) return n;
}
}
}
return rounds-1;
}
void CDarkSendPool::Reset(){
cachedLastSuccess = 0;
vecMasternodesUsed.clear();
UnlockCoins();
SetNull();
}
void CDarkSendPool::SetNull(bool clearEverything){
finalTransaction.vin.clear();
finalTransaction.vout.clear();
entries.clear();
state = POOL_STATUS_ACCEPTING_ENTRIES;
lastTimeChanged = GetTimeMillis();
entriesCount = 0;
lastEntryAccepted = 0;
countEntriesAccepted = 0;
lastNewBlock = 0;
sessionUsers = 0;
sessionDenom = 0;
sessionFoundMasternode = false;
vecSessionCollateral.clear();
txCollateral = CTransaction();
if(clearEverything){
myEntries.clear();
if(fMasterNode){
sessionID = 1 + (rand() % 999999);
} else {
sessionID = 0;
}
}
// -- seed random number generator (used for ordering output lists)
unsigned int seed = 0;
GetRandBytes((unsigned char*)&seed, sizeof(seed));
std::srand(seed);
}
bool CDarkSendPool::SetCollateralAddress(std::string strAddress){
CBitcoinAddress address;
if (!address.SetString(strAddress))
{
LogPrintf("CDarkSendPool::SetCollateralAddress - Invalid DarkSend collateral address\n");
return false;
}
collateralPubKey= GetScriptForDestination(address.Get());
return true;
}
//
// Unlock coins after Darksend fails or succeeds
//
void CDarkSendPool::UnlockCoins(){
BOOST_FOREACH(CTxIn v, lockedCoins)
pwalletMain->UnlockCoin(v.prevout);
lockedCoins.clear();
}
//
// Check the Darksend progress and send client updates if a masternode
//
void CDarkSendPool::Check()
{
if(fDebug) LogPrintf("CDarkSendPool::Check()\n");
if(fDebug) LogPrintf("CDarkSendPool::Check() - entries count %lu\n", entries.size());
// If entries is full, then move on to the next phase
if(state == POOL_STATUS_ACCEPTING_ENTRIES && (int)entries.size() >= GetMaxPoolTransactions())
{
if(fDebug) LogPrintf("CDarkSendPool::Check() -- ACCEPTING OUTPUTS\n");
UpdateState(POOL_STATUS_FINALIZE_TRANSACTION);
}
// create the finalized transaction for distribution to the clients
if(state == POOL_STATUS_FINALIZE_TRANSACTION && finalTransaction.vin.empty() && finalTransaction.vout.empty()) {
if(fDebug) LogPrintf("CDarkSendPool::Check() -- FINALIZE TRANSACTIONS\n");
UpdateState(POOL_STATUS_SIGNING);
if (fMasterNode) {
// make our new transaction
CTransaction txNew;
for(unsigned int i = 0; i < entries.size(); i++){
BOOST_FOREACH(const CTxOut v, entries[i].vout)
txNew.vout.push_back(v);
BOOST_FOREACH(const CDarkSendEntryVin s, entries[i].sev)
txNew.vin.push_back(s.vin);
}
// shuffle the outputs for improved anonymity
std::random_shuffle ( txNew.vout.begin(), txNew.vout.end(), randomizeList);
if(fDebug) LogPrintf("Transaction 1: %s\n", txNew.ToString().c_str());
SignFinalTransaction(txNew, NULL);
// request signatures from clients
RelayDarkSendFinalTransaction(sessionID, txNew);
}
}
// collect signatures from clients
// If we have all of the signatures, try to compile the transaction
if(state == POOL_STATUS_SIGNING && SignaturesComplete()) {
if(fDebug) LogPrintf("CDarkSendPool::Check() -- SIGNING\n");
UpdateState(POOL_STATUS_TRANSMISSION);
CWalletTx txNew = CWalletTx(pwalletMain, finalTransaction);
LOCK2(cs_main, pwalletMain->cs_wallet);
{
if (fMasterNode) { //only the main node is master atm
if(fDebug) LogPrintf("Transaction 2: %s\n", txNew.ToString().c_str());
// See if the transaction is valid
if (!txNew.AcceptToMemoryPool(true))
{
LogPrintf("CDarkSendPool::Check() - CommitTransaction : Error: Transaction not valid\n");
SetNull();
pwalletMain->Lock();
// not much we can do in this case
UpdateState(POOL_STATUS_ACCEPTING_ENTRIES);
RelayDarkSendCompletedTransaction(sessionID, true, "Transaction not valid, please try again");
return;
}
LogPrintf("CDarkSendPool::Check() -- IS MASTER -- TRANSMITTING DARKSEND\n");
// sign a message
int64_t sigTime = GetAdjustedTime();
std::string strMessage = txNew.GetHash().ToString() + boost::lexical_cast<std::string>(sigTime);
std::string strError = "";
std::vector<unsigned char> vchSig;
CKey key2;
CPubKey pubkey2;
if(!darkSendSigner.SetKey(strMasterNodePrivKey, strError, key2, pubkey2))
{
LogPrintf("CDarkSendPool::Check() - ERROR: Invalid masternodeprivkey: '%s'\n", strError.c_str());
return;
}
if(!darkSendSigner.SignMessage(strMessage, strError, vchSig, key2)) {
LogPrintf("CDarkSendPool::Check() - Sign message failed\n");
return;
}
if(!darkSendSigner.VerifyMessage(pubkey2, vchSig, strMessage, strError)) {
LogPrintf("CDarkSendPool::Check() - Verify message failed\n");
return;
}
if(!mapDarksendBroadcastTxes.count(txNew.GetHash())){
CDarksendBroadcastTx dstx;
dstx.tx = txNew;
dstx.vin = activeMasternode.vin;
dstx.vchSig = vchSig;
dstx.sigTime = sigTime;
mapDarksendBroadcastTxes.insert(make_pair(txNew.GetHash(), dstx));
}
// Broadcast the transaction to the network
txNew.fTimeReceivedIsTxTime = true;
txNew.RelayWalletTransaction();
// Tell the clients it was successful
RelayDarkSendCompletedTransaction(sessionID, false, _("Transaction created successfully."));
// Randomly charge clients
ChargeRandomFees();
}
}
}
// move on to next phase, allow 3 seconds incase the masternode wants to send us anything else
if((state == POOL_STATUS_TRANSMISSION && fMasterNode) || (state == POOL_STATUS_SIGNING && completedTransaction) ) {
if(fDebug) LogPrintf("CDarkSendPool::Check() -- COMPLETED -- RESETTING \n");
SetNull(true);
UnlockCoins();
if(fMasterNode) RelayDarkSendStatus(darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_RESET);
pwalletMain->Lock();
}
// reset if we're here for 10 seconds
if((state == POOL_STATUS_ERROR || state == POOL_STATUS_SUCCESS) && GetTimeMillis()-lastTimeChanged >= 10000) {
if(fDebug) LogPrintf("CDarkSendPool::Check() -- RESETTING MESSAGE \n");
SetNull(true);
if(fMasterNode) RelayDarkSendStatus(darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_RESET);
UnlockCoins();
}
}
//
// Charge clients a fee if they're abusive
//
// Why bother? Darksend uses collateral to ensure abuse to the process is kept to a minimum.
// The submission and signing stages in darksend are completely separate. In the cases where
// a client submits a transaction then refused to sign, there must be a cost. Otherwise they
// would be able to do this over and over again and bring the mixing to a hault.
//
// How does this work? Messages to masternodes come in via "dsi", these require a valid collateral
// transaction for the client to be able to enter the pool. This transaction is kept by the masternode
// until the transaction is either complete or fails.
//
void CDarkSendPool::ChargeFees(){
if(fMasterNode) {
//we don't need to charge collateral for every offence.
int offences = 0;
int r = rand()%100;
if(r > 33) return;
if(state == POOL_STATUS_ACCEPTING_ENTRIES){
BOOST_FOREACH(const CTransaction& txCollateral, vecSessionCollateral) {
bool found = false;
BOOST_FOREACH(const CDarkSendEntry& v, entries) {
if(v.collateral == txCollateral) {
found = true;
}
}
// This queue entry didn't send us the promised transaction
if(!found){
LogPrintf("CDarkSendPool::ChargeFees -- found uncooperative node (didn't send transaction). Found offence.\n");
offences++;
}
}
}
if(state == POOL_STATUS_SIGNING) {
// who didn't sign?
BOOST_FOREACH(const CDarkSendEntry v, entries) {
BOOST_FOREACH(const CDarkSendEntryVin s, v.sev) {
if(!s.isSigSet){
LogPrintf("CDarkSendPool::ChargeFees -- found uncooperative node (didn't sign). Found offence\n");
offences++;
}
}
}
}
r = rand()%100;
int target = 0;
//mostly offending?
if(offences >= POOL_MAX_TRANSACTIONS-1 && r > 33) return;
//everyone is an offender? That's not right
if(offences >= POOL_MAX_TRANSACTIONS) return;
//charge one of the offenders randomly
if(offences > 1) target = 50;
//pick random client to charge
r = rand()%100;
if(state == POOL_STATUS_ACCEPTING_ENTRIES){
BOOST_FOREACH(const CTransaction& txCollateral, vecSessionCollateral) {
bool found = false;
BOOST_FOREACH(const CDarkSendEntry& v, entries) {
if(v.collateral == txCollateral) {
found = true;
}
}
// This queue entry didn't send us the promised transaction
if(!found && r > target){
LogPrintf("CDarkSendPool::ChargeFees -- found uncooperative node (didn't send transaction). charging fees.\n");
CWalletTx wtxCollateral = CWalletTx(pwalletMain, txCollateral);
// Broadcast
if (!wtxCollateral.AcceptToMemoryPool(true))
{
// This must not fail. The transaction has already been signed and recorded.
LogPrintf("CDarkSendPool::ChargeFees() : Error: Transaction not valid");
}
wtxCollateral.RelayWalletTransaction();
return;
}
}
}
if(state == POOL_STATUS_SIGNING) {
// who didn't sign?
BOOST_FOREACH(const CDarkSendEntry v, entries) {
BOOST_FOREACH(const CDarkSendEntryVin s, v.sev) {
if(!s.isSigSet && r > target){
LogPrintf("CDarkSendPool::ChargeFees -- found uncooperative node (didn't sign). charging fees.\n");
CWalletTx wtxCollateral = CWalletTx(pwalletMain, v.collateral);
// Broadcast
if (!wtxCollateral.AcceptToMemoryPool(true))
{
// This must not fail. The transaction has already been signed and recorded.
LogPrintf("CDarkSendPool::ChargeFees() : Error: Transaction not valid");
}
wtxCollateral.RelayWalletTransaction();
return;
}
}
}
}
}
}
// charge the collateral randomly
// - Darksend is completely free, to pay miners we randomly pay the collateral of users.
void CDarkSendPool::ChargeRandomFees(){
if(fMasterNode) {
int i = 0;
BOOST_FOREACH(const CTransaction& txCollateral, vecSessionCollateral) {
int r = rand()%1000;
/*
Collateral Fee Charges:
Being that DarkSend has "no fees" we need to have some kind of cost associated
with using it to stop abuse. Otherwise it could serve as an attack vector and
allow endless transaction that would bloat Transfer and make it unusable. To
stop these kinds of attacks 1 in 50 successful transactions are charged. This
adds up to a cost of 0.002TX per transaction on average.
*/
if(r <= 20)
{
LogPrintf("CDarkSendPool::ChargeRandomFees -- charging random fees. %u\n", i);
CWalletTx wtxCollateral = CWalletTx(pwalletMain, txCollateral);
// Broadcast
if (!wtxCollateral.AcceptToMemoryPool(true))
{
// This must not fail. The transaction has already been signed and recorded.
LogPrintf("CDarkSendPool::ChargeRandomFees() : Error: Transaction not valid");
}
wtxCollateral.RelayWalletTransaction();
}
}
}
}
//
// Check for various timeouts (queue objects, darksend, etc)
//
void CDarkSendPool::CheckTimeout(){
if(!fEnableDarksend && !fMasterNode) return;
// catching hanging sessions
if(!fMasterNode) {
if(state == POOL_STATUS_TRANSMISSION) {
if(fDebug) LogPrintf("CDarkSendPool::CheckTimeout() -- Session complete -- Running Check()\n");
Check();
}
}
// check darksend queue objects for timeouts
int c = 0;
vector<CDarksendQueue>::iterator it;
for(it=vecDarksendQueue.begin();it<vecDarksendQueue.end();it++){
if((*it).IsExpired()){
if(fDebug) LogPrintf("CDarkSendPool::CheckTimeout() : Removing expired queue entry - %d\n", c);
vecDarksendQueue.erase(it);
break;
}
c++;
}
/* Check to see if we're ready for submissions from clients */
if(state == POOL_STATUS_QUEUE && sessionUsers == GetMaxPoolTransactions()) {
CDarksendQueue dsq;
dsq.nDenom = sessionDenom;
dsq.vin = activeMasternode.vin;
dsq.time = GetTime();
dsq.ready = true;
dsq.Sign();
dsq.Relay();
UpdateState(POOL_STATUS_ACCEPTING_ENTRIES);
}
int addLagTime = 0;
if(!fMasterNode) addLagTime = 5000; //if we're the client, give the server a few extra seconds before resetting.
if(state == POOL_STATUS_ACCEPTING_ENTRIES || state == POOL_STATUS_QUEUE){
c = 0;
// if it's a masternode, the entries are stored in "entries", otherwise they're stored in myEntries
std::vector<CDarkSendEntry> *vec = &myEntries;
if(fMasterNode) vec = &entries;
// check for a timeout and reset if needed
vector<CDarkSendEntry>::iterator it2;
for(it2=vec->begin();it2<vec->end();it2++){
if((*it2).IsExpired()){
if(fDebug) LogPrintf("CDarkSendPool::CheckTimeout() : Removing expired entry - %d\n", c);
vec->erase(it2);
if(entries.size() == 0 && myEntries.size() == 0){
SetNull(true);
UnlockCoins();
}
if(fMasterNode){
RelayDarkSendStatus(darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_RESET);
}
break;
}
c++;
}
if(GetTimeMillis()-lastTimeChanged >= (DARKSEND_QUEUE_TIMEOUT*1000)+addLagTime){
lastTimeChanged = GetTimeMillis();
ChargeFees();
// reset session information for the queue query stage (before entering a masternode, clients will send a queue request to make sure they're compatible denomination wise)
sessionUsers = 0;
sessionDenom = 0;
sessionFoundMasternode = false;
vecSessionCollateral.clear();
UpdateState(POOL_STATUS_ACCEPTING_ENTRIES);
}
} else if(GetTimeMillis()-lastTimeChanged >= (DARKSEND_QUEUE_TIMEOUT*1000)+addLagTime){
if(fDebug) LogPrintf("CDarkSendPool::CheckTimeout() -- Session timed out (30s) -- resetting\n");
SetNull();
UnlockCoins();
UpdateState(POOL_STATUS_ERROR);
lastMessage = _("Session timed out (30 seconds), please resubmit.");
}
if(state == POOL_STATUS_SIGNING && GetTimeMillis()-lastTimeChanged >= (DARKSEND_SIGNING_TIMEOUT*1000)+addLagTime ) {
if(fDebug) LogPrintf("CDarkSendPool::CheckTimeout() -- Session timed out -- restting\n");
ChargeFees();
SetNull();
UnlockCoins();
//add my transactions to the new session
UpdateState(POOL_STATUS_ERROR);
lastMessage = _("Signing timed out, please resubmit.");
}
}
// check to see if the signature is valid
bool CDarkSendPool::SignatureValid(const CScript& newSig, const CTxIn& newVin){
CTransaction txNew;
txNew.vin.clear();
txNew.vout.clear();
int found = -1;
CScript sigPubKey = CScript();
unsigned int i = 0;
BOOST_FOREACH(CDarkSendEntry e, entries) {
BOOST_FOREACH(const CTxOut out, e.vout)
txNew.vout.push_back(out);
BOOST_FOREACH(const CDarkSendEntryVin s, e.sev){
txNew.vin.push_back(s.vin);
if(s.vin == newVin){
found = i;
sigPubKey = s.vin.prevPubKey;
}
i++;
}
}
if(found >= 0){ //might have to do this one input at a time?
int n = found;
txNew.vin[n].scriptSig = newSig;
if(fDebug) LogPrintf("CDarkSendPool::SignatureValid() - Sign with sig %s\n", newSig.ToString().substr(0,24).c_str());
if (!VerifyScript(txNew.vin[n].scriptSig, sigPubKey, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, SignatureChecker(txNew, i))){
if(fDebug) LogPrintf("CDarkSendPool::SignatureValid() - Signing - Error signing input %u\n", n);
return false;
}
}
if(fDebug) LogPrintf("CDarkSendPool::SignatureValid() - Signing - Succesfully signed input\n");
return true;
}
// check to make sure the collateral provided by the client is valid
bool CDarkSendPool::IsCollateralValid(const CTransaction& txCollateral){
if(txCollateral.vout.size() < 1) return false;
if(txCollateral.nLockTime != 0) return false;
int64_t nValueIn = 0;
int64_t nValueOut = 0;
bool missingTx = false;
BOOST_FOREACH(const CTxOut o, txCollateral.vout){
nValueOut += o.nValue;
if(!o.scriptPubKey.IsNormalPaymentScript()){
LogPrintf ("CDarkSendPool::IsCollateralValid - Invalid Script %s\n", txCollateral.ToString().c_str());
return false;
}
}
BOOST_FOREACH(const CTxIn i, txCollateral.vin){
CTransaction tx2;
uint256 hash;
//if(GetTransaction(i.prevout.hash, tx2, hash, true)){
if(GetTransaction(i.prevout.hash, tx2, hash)){
if(tx2.vout.size() > i.prevout.n) {
nValueIn += tx2.vout[i.prevout.n].nValue;
}
} else{
missingTx = true;
}
}
if(missingTx){
if(fDebug) LogPrintf ("CDarkSendPool::IsCollateralValid - Unknown inputs in collateral transaction - %s\n", txCollateral.ToString().c_str());
return false;
}
//collateral transactions are required to pay out DARKSEND_COLLATERAL as a fee to the miners
if(nValueIn-nValueOut < DARKSEND_COLLATERAL) {
if(fDebug) LogPrintf ("CDarkSendPool::IsCollateralValid - did not include enough fees in transaction %d\n%s\n", nValueOut-nValueIn, txCollateral.ToString().c_str());
return false;
}
if(fDebug) LogPrintf("CDarkSendPool::IsCollateralValid %s\n", txCollateral.ToString().c_str());
CValidationState state;
//if(!AcceptableInputs(mempool, state, txCollateral)){
bool* pfMissingInputs = false;
if(!AcceptableInputs(mempool, txCollateral, false, pfMissingInputs)){
if(fDebug) LogPrintf ("CDarkSendPool::IsCollateralValid - didn't pass IsAcceptable\n");
return false;
}
return true;
}
//
// Add a clients transaction to the pool
//
bool CDarkSendPool::AddEntry(const std::vector<CTxIn>& newInput, const int64_t& nAmount, const CTransaction& txCollateral, const std::vector<CTxOut>& newOutput, std::string& error){
if (!fMasterNode) return false;
BOOST_FOREACH(CTxIn in, newInput) {
if (in.prevout.IsNull() || nAmount < 0) {
if(fDebug) LogPrintf ("CDarkSendPool::AddEntry - input not valid!\n");
error = _("Input is not valid.");
sessionUsers--;
return false;
}