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darksend.cpp
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darksend.cpp
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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 "util.h"
#include "masternodeman.h"
#include "instantx.h"
#include "ui_interface.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;
// Keep track of the active Masternode
CActiveMasternode activeMasternode;
// Count peers we've requested the list from
int RequestedMasterNodeList = 0;
/* *** BEGIN DARKSEND MAGIC - DARKCOIN **********
Copyright (c) 2014-2015, Darkcoin Developers
eduffield - evan@darkcoin.io
udjinm6 - udjinm6@darkcoin.io
*/
void inline CDarksendPool::ProcessMessageDarksend(CNode* pfrom, std::string& strCommand, CDataStream& vRecv)
{
if(fLiteMode) return; //disable all Darksend/Masternode related functionality
if(IsInitialBlockDownload()) return;
if (strCommand == "dsa") { //Darksend Accept Into Pool
if (pfrom->nVersion < MIN_POOL_PEER_PROTO_VERSION) {
std::string strError = _("Incompatible version.");
LogPrintf("dsa -- incompatible version! \n");
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, strError);
return;
}
if(!fMasterNode){
std::string strError = _("This is not a Masternode.");
LogPrintf("dsa -- not a Masternode! \n");
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, strError);
return;
}
int nDenom;
CTransaction txCollateral;
vRecv >> nDenom >> txCollateral;
std::string error = "";
CMasternode* pmn = mnodeman.Find(activeMasternode.vin);
if(pmn == NULL)
{
std::string strError = _("Not in the Masternode list.");
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, strError);
return;
}
if(sessionUsers == 0) {
if(pmn->nLastDsq != 0 &&
pmn->nLastDsq + mnodeman.CountMasternodesAboveProtocol(MIN_POOL_PEER_PROTO_VERSION)/5 > mnodeman.nDsqCount){
LogPrintf("dsa -- last dsq too recent, must wait. %s \n", pmn->addr.ToString().c_str());
std::string strError = _("Last Darksend was too recent.");
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, strError);
return;
}
}
if(!IsCompatibleWithSession(nDenom, txCollateral, error))
{
LogPrintf("dsa -- not compatible with existing transactions! \n");
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
} else {
LogPrintf("dsa -- is compatible, please submit! \n");
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_ACCEPTED, error);
return;
}
} else if (strCommand == "dsq") { //Darksend Queue
LOCK(cs_darksend);
if (pfrom->nVersion < MIN_POOL_PEER_PROTO_VERSION) {
return;
}
CDarksendQueue dsq;
vRecv >> dsq;
CService addr;
if(!dsq.GetAddress(addr)) return;
if(!dsq.CheckSignature()) return;
if(dsq.IsExpired()) return;
CMasternode* pmn = mnodeman.Find(dsq.vin);
if(pmn == NULL) return;
// if the queue is ready, submit if we can
if(dsq.ready) {
if(!pSubmittedToMasternode) return;
if((CNetAddr)pSubmittedToMasternode->addr != (CNetAddr)addr){
LogPrintf("dsq - message doesn't match current Masternode - %s != %s\n", pSubmittedToMasternode->addr.ToString().c_str(), addr.ToString().c_str());
return;
}
if(state == POOL_STATUS_QUEUE){
//save the relay signature info
AddRelaySignature(dsq.vchRelaySig, dsq.nBlockHeight, dsq.strSharedKey);
if (fDebug) LogPrintf("Darksend queue is ready - %s\n", addr.ToString().c_str());
PrepareDarksendDenominate();
}
} else {
BOOST_FOREACH(CDarksendQueue q, vecDarksendQueue){
if(q.vin == dsq.vin) return;
}
if(fDebug) LogPrintf("dsq last %d last2 %d count %d\n", pmn->nLastDsq, pmn->nLastDsq + mnodeman.size()/5, mnodeman.nDsqCount);
//don't allow a few nodes to dominate the queuing process
if(pmn->nLastDsq != 0 &&
pmn->nLastDsq + mnodeman.CountMasternodesAboveProtocol(MIN_POOL_PEER_PROTO_VERSION)/5 > mnodeman.nDsqCount){
if(fDebug) LogPrintf("dsq -- Masternode sending too many dsq messages. %s \n", pmn->addr.ToString().c_str());
return;
}
mnodeman.nDsqCount++;
pmn->nLastDsq = mnodeman.nDsqCount;
pmn->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 == "dsr") { //Darksend Relay
//* Ask a Masternode to relay an anonymous output to another Masternode *//
std::string error = "";
if (pfrom->nVersion < MIN_POOL_PEER_PROTO_VERSION) {
LogPrintf("dsr -- incompatible version! \n");
return;
}
if(!fMasterNode){
LogPrintf("dsr -- not a Masternode! \n");
return;
}
CDarkSendRelay dsr;
vRecv >> dsr;
if(chainActive.Tip()->nHeight - dsr.nBlockHeight > 10) return;
if(dsr.nRelayType != DARKSEND_RELAY_IN &&
dsr.nRelayType != DARKSEND_RELAY_OUT &&
dsr.nRelayType != DARKSEND_RELAY_SIG) return;
if(dsr.in == CTxIn() && dsr.nRelayType == DARKSEND_RELAY_IN) return;
if(dsr.out == CTxOut() && dsr.nRelayType == DARKSEND_RELAY_OUT) return;
if(dsr.in == CTxIn() && dsr.nRelayType == DARKSEND_RELAY_SIG) return;
CMasternode* pmn = mnodeman.Find(dsr.vinMasternode);
if(!pmn){
LogPrintf("dsr -- unknown Masternode! %s \n", dsr.vinMasternode.ToString().c_str());
return;
}
int a = mnodeman.GetMasternodeRank(activeMasternode.vin, chainActive.Tip()->nHeight, MIN_POOL_PEER_PROTO_VERSION);
/*
For added DDOS protection, clients can only relay through 20 nodes per block.
*/
if(a > 20){
LogPrintf("dsr -- unknown/invalid Masternode! %s \n", activeMasternode.vin.ToString().c_str());
return;
}
//check the signature from the target Masternode
std::string strMessage = boost::lexical_cast<std::string>(dsr.nBlockHeight);
std::string errorMessage = "";
if(!darkSendSigner.VerifyMessage(pmn->pubkey2, dsr.vchSig, strMessage, errorMessage)){
LogPrintf("dsr - Got bad Masternode address signature\n");
Misbehaving(pfrom->GetId(), 100);
return;
}
//connect and deliver the message
if(ConnectNode((CAddress)pmn->addr, NULL, true)){
CNode* pNode = FindNode(pmn->addr);
if(pNode)
{
pNode->PushMessage("dsai", dsr);
return;
}
}
} else if (strCommand == "dsai") { //Darksend Anonymous Item (Input/Output/Sig)
std::string error = "";
if (pfrom->nVersion < MIN_POOL_PEER_PROTO_VERSION) {
LogPrintf("dsai -- incompatible version! \n");
return;
}
if(!fMasterNode){
LogPrintf("dsai -- not a Masternode! \n");
return;
}
CDarkSendRelay dsr;
vRecv >> dsr;
if(chainActive.Tip()->nHeight - dsr.nBlockHeight > 10) return;
if(darkSendPool.strMasternodeSharedKey == "") return;
if(dsr.nRelayType != DARKSEND_RELAY_IN &&
dsr.nRelayType != DARKSEND_RELAY_OUT &&
dsr.nRelayType != DARKSEND_RELAY_SIG) return;
if(dsr.in == CTxIn() && dsr.nRelayType == DARKSEND_RELAY_IN) return;
if(dsr.out == CTxOut() && dsr.nRelayType == DARKSEND_RELAY_OUT) return;
if(dsr.in == CTxIn() && dsr.nRelayType == DARKSEND_RELAY_SIG) return;
CMasternode* pmn = mnodeman.Find(dsr.vinMasternode);
if(!pmn){
LogPrintf("dsr -- unknown Masternode! %s \n", dsr.vinMasternode.ToString().c_str());
return;
}
//check the signature from the target Masternode
std::string strMessage = boost::lexical_cast<std::string>(dsr.nBlockHeight);
std::string errorMessage = "";
if(!darkSendSigner.VerifyMessage(pmn->pubkey2, dsr.vchSig, strMessage, errorMessage)){
LogPrintf("dsr - Got bad Masternode address signature\n");
Misbehaving(pfrom->GetId(), 100);
return;
}
if(!dsr.VerifyMessage(darkSendPool.strMasternodeSharedKey)){
LogPrintf("dsai - Got bad shared key signature\n");
Misbehaving(pfrom->GetId(), 30);
return;
}
//do we have enough users in the current session?
if(!IsSessionReady()){
LogPrintf("dsai -- session not complete! \n");
return;
}
switch(dsr.nRelayType){
case DARKSEND_RELAY_IN:
anonTx.AddInput(dsr.in);
break;
case DARKSEND_RELAY_OUT:
anonTx.AddOutput(dsr.out);
break;
case DARKSEND_RELAY_SIG:
anonTx.AddSig(dsr.in);
break;
}
// relay to all peers that an entry was added to the pool successfully.
RelayStatus(sessionID, GetState(), GetEntriesCount(), MASTERNODE_ACCEPTED);
Check();
} else if (strCommand == "dsi") { //Darksend vIn
std::string error = "";
if (pfrom->nVersion < MIN_POOL_PEER_PROTO_VERSION) {
LogPrintf("dsi -- incompatible version! \n");
error = _("Incompatible version.");
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
if(!fMasterNode){
LogPrintf("dsi -- not a Masternode! \n");
error = _("This is not a Masternode.");
pfrom->PushMessage("dssu", sessionID, GetState(), 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(!IsSessionReady()){
LogPrintf("dsi -- session not complete! \n");
error = _("Session not complete!");
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
//do we have the same denominations as the current session?
if(!IsCompatibleWithEntries(out))
{
LogPrintf("dsi -- not compatible with existing transactions! \n");
error = _("Not compatible with existing transactions.");
pfrom->PushMessage("dssu", sessionID, GetState(), 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(const 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", sessionID, GetState(), 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", sessionID, GetState(), 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(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", sessionID, GetState(), 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", sessionID, GetState(), 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", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
if(!AcceptableInputs(mempool, state, tx)){
LogPrintf("dsi -- transaction not valid! \n");
error = _("Transaction not valid.");
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, error);
return;
}
}
if(AddEntry(in, nAmount, txCollateral, out, error)){
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_ACCEPTED, error);
Check();
RelayStatus(sessionID, GetState(), GetEntriesCount(), MASTERNODE_RESET);
} else {
pfrom->PushMessage("dssu", sessionID, GetState(), GetEntriesCount(), MASTERNODE_REJECTED, error);
}
} else if (strCommand == "dssu") { //Darksend status update
if (pfrom->nVersion < MIN_POOL_PEER_PROTO_VERSION) {
return;
}
if(!pSubmittedToMasternode) return;
if((CNetAddr)pSubmittedToMasternode->addr != (CNetAddr)pfrom->addr){
//LogPrintf("dssu - message doesn't match current Masternode - %s != %s\n", pSubmittedToMasternode->addr.ToString().c_str(), pfrom->addr.ToString().c_str());
return;
}
int sessionIDMessage;
int state;
int entriesCount;
int accepted;
std::string error;
vRecv >> sessionIDMessage >> 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) && sessionID != sessionIDMessage){
LogPrintf("dssu - message doesn't match current Darksend session %d %d\n", sessionID, sessionIDMessage);
return;
}
StatusUpdate(state, entriesCount, accepted, error, sessionIDMessage);
} else if (strCommand == "dss") { //Darksend Sign Final Tx
if (pfrom->nVersion < MIN_POOL_PEER_PROTO_VERSION) {
return;
}
vector<CTxIn> sigs;
vRecv >> sigs;
bool success = false;
int count = 0;
BOOST_FOREACH(const CTxIn item, sigs)
{
if(AddScriptSig(item)) success = true;
if(fDebug) LogPrintf(" -- sigs count %d %d\n", (int)sigs.size(), count);
count++;
}
if(success){
CheckFinalTransaction();
RelayStatus(sessionID, GetState(), GetEntriesCount(), MASTERNODE_RESET);
}
} else if (strCommand == "dsf") { //Darksend Final tx
if (pfrom->nVersion < MIN_POOL_PEER_PROTO_VERSION) {
return;
}
if(!pSubmittedToMasternode) return;
if((CNetAddr)pSubmittedToMasternode->addr != (CNetAddr)pfrom->addr){
//LogPrintf("dsc - message doesn't match current Masternode - %s != %s\n", pSubmittedToMasternode->addr.ToString().c_str(), pfrom->addr.ToString().c_str());
return;
}
int sessionIDMessage;
CTransaction txNew;
vRecv >> sessionIDMessage >> txNew;
if(sessionID != sessionIDMessage){
if (fDebug) LogPrintf("dsf - message doesn't match current Darksend session %d %d\n", sessionID, sessionIDMessage);
return;
}
//check to see if input is spent already? (and probably not confirmed)
SignFinalTransaction(txNew, pfrom);
} else if (strCommand == "dsc") { //Darksend Complete
if (pfrom->nVersion < MIN_POOL_PEER_PROTO_VERSION) {
return;
}
if(!pSubmittedToMasternode) return;
if((CNetAddr)pSubmittedToMasternode->addr != (CNetAddr)pfrom->addr){
//LogPrintf("dsc - message doesn't match current Masternode - %s != %s\n", pSubmittedToMasternode->addr.ToString().c_str(), pfrom->addr.ToString().c_str());
return;
}
int sessionIDMessage;
bool error;
std::string lastMessage;
vRecv >> sessionIDMessage >> error >> lastMessage;
if(sessionID != sessionIDMessage){
if (fDebug) LogPrintf("dsc - message doesn't match current Darksend session %d %d\n", darkSendPool.sessionID, sessionIDMessage);
return;
}
darkSendPool.CompletedTransaction(error, lastMessage);
}
}
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)
{
static std::map<uint256, CWalletTx> mDenomWtxes;
if(rounds >= 17) return rounds;
uint256 hash = in.prevout.hash;
unsigned int nout = in.prevout.n;
CWalletTx wtx;
if(pwalletMain->GetTransaction(hash, wtx))
{
std::map<uint256, CWalletTx>::const_iterator mdwi = mDenomWtxes.find(hash);
// not known yet, let's add it
if(mdwi == mDenomWtxes.end())
{
if(fDebug) LogPrintf("GetInputDarksendRounds INSERTING %s\n", hash.ToString());
mDenomWtxes[hash] = wtx;
}
// found and it's not an initial value, just return it
else if(mDenomWtxes[hash].vout[nout].nRounds != -10)
{
if(fDebug) LogPrintf("GetInputDarksendRounds INFO %s %3d %d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
return mDenomWtxes[hash].vout[nout].nRounds;
}
// bounds check
if(nout >= wtx.vout.size())
{
mDenomWtxes[hash].vout[nout].nRounds = -4;
if(fDebug) LogPrintf("GetInputDarksendRounds UPDATED %s %3d %d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
return mDenomWtxes[hash].vout[nout].nRounds;
}
mDenomWtxes[hash].vout[nout].nRounds = -3;
if(pwalletMain->IsCollateralAmount(wtx.vout[nout].nValue))
{
mDenomWtxes[hash].vout[nout].nRounds = -3;
if(fDebug) LogPrintf("GetInputDarksendRounds UPDATED %s %3d %d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
return mDenomWtxes[hash].vout[nout].nRounds;
}
//make sure the final output is non-denominate
mDenomWtxes[hash].vout[nout].nRounds = -2;
if(/*rounds == 0 && */!pwalletMain->IsDenominatedAmount(wtx.vout[nout].nValue)) //NOT DENOM
{
mDenomWtxes[hash].vout[nout].nRounds = -2;
if(fDebug) LogPrintf("GetInputDarksendRounds UPDATED %s %3d %d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
return mDenomWtxes[hash].vout[nout].nRounds;
}
bool fAllDenoms = true;
BOOST_FOREACH(CTxOut out, wtx.vout)
{
fAllDenoms = fAllDenoms && pwalletMain->IsDenominatedAmount(out.nValue);
}
// this one is denominated but there is another non-denominated output found in the same tx
if(!fAllDenoms)
{
mDenomWtxes[hash].vout[nout].nRounds = 0;
if(fDebug) LogPrintf("GetInputDarksendRounds UPDATED %s %3d %d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
return mDenomWtxes[hash].vout[nout].nRounds;
}
int nShortest = -10; // an initial value, should be no way to get this by calculations
bool fDenomFound = false;
// only denoms here so let's look up
BOOST_FOREACH(CTxIn in2, wtx.vin)
{
if(pwalletMain->IsMine(in2))
{
int n = GetInputDarksendRounds(in2, rounds+1);
// denom found, find the shortest chain or initially assign nShortest with the first found value
if(n >= 0 && (n < nShortest || nShortest == -10))
{
nShortest = n;
fDenomFound = true;
}
}
}
mDenomWtxes[hash].vout[nout].nRounds = fDenomFound
? nShortest + 1 // good, we a +1 to the shortest one
: 0; // too bad, we are the fist one in that chain
if(fDebug) LogPrintf("GetInputDarksendRounds UPDATED %s %3d %d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
return mDenomWtxes[hash].vout[nout].nRounds;
}
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();
anonTx.vin.clear();
anonTx.vout.clear();
nTrickleInputsOutputs = 0;
state = POOL_STATUS_IDLE;
lastTimeChanged = GetTimeMillis();
entriesCount = 0;
lastEntryAccepted = 0;
countEntriesAccepted = 0;
lastNewBlock = 0;
fSubmitAnonymousFailed = false;
sessionUsers = 0;
sessionDenom = 0;
sessionFoundMasternode = false;
vecSessionCollateral.clear();
txCollateral = CTransaction();
vchMasternodeRelaySig.clear();
nMasternodeBlockHeight = 0;
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;
RAND_bytes((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.SetDestination(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());
//printf("CDarksendPool::Check() %d - %d - %d\n", state, anonTx.CountEntries(), GetTimeMillis()-lastTimeChanged);
// If entries is full, then move on to the next phase
if(state == POOL_STATUS_ACCEPTING_ENTRIES && (
(int)entries.size() >= GetMaxPoolTransactions() ||
(GetTimeMillis()-lastTimeChanged > 5000 && anonTx.CountEntries() > GetMaxPoolTransactions()*5)
))
{
if(fDebug) LogPrintf("CDarksendPool::Check() -- TRYING TRANSACTION \n");
UpdateState(POOL_STATUS_FINALIZE_TRANSACTION);
nCountAttempts++;
}
// create the finalized transaction for distribution to the clients
if(state == POOL_STATUS_FINALIZE_TRANSACTION) {
if(fDebug) LogPrintf("CDarksendPool::Check() -- FINALIZE TRANSACTIONS\n");
UpdateState(POOL_STATUS_SIGNING);
if (fMasterNode) {
CTransaction txNew;
// make our new transaction
if((int)entries.size() >= GetMaxPoolTransactions()) {
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 CTxDSIn& s, entries[i].sev)
txNew.vin.push_back(s);
}
// shuffle the outputs for improved anonymity
std::random_shuffle ( txNew.vin.begin(), txNew.vin.end(), randomizeList);
std::random_shuffle ( txNew.vout.begin(), txNew.vout.end(), randomizeList);
} else {
BOOST_FOREACH(CTxDSIn& v, anonTx.vin)
txNew.vin.push_back((CTxIn)v);
BOOST_FOREACH(CTxOut& v, anonTx.vout)
txNew.vout.push_back(v);
}
if(fDebug) LogPrintf("Transaction 1: %s\n", txNew.ToString().c_str());
finalTransaction = txNew;
// request signatures from clients
RelayFinalTransaction(sessionID, finalTransaction);
}
}
//printf("Signing Status %d %d\n", state == POOL_STATUS_SIGNING, SignaturesComplete());
// 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);
CheckFinalTransaction();
}
// 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) RelayStatus(darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_RESET);
UnlockCoins();
}
}
void CDarksendPool::CheckFinalTransaction()
{
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(false))
{
if(nCountAttempts > 10) {
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);
if(nCountAttempts > 5) RelayCompletedTransaction(sessionID, true, "Transaction not valid, please try again");
if(!fSubmitAnonymousFailed && nCountAttempts > 5)
fSubmitAnonymousFailed = true;
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
RelayCompletedTransaction(sessionID, false, _("Transaction created successfully."));
// Randomly charge clients
ChargeRandomFees();
// Reset
if(fDebug) LogPrintf("CDarksendPool::Check() -- COMPLETED -- RESETTING \n");
SetNull(true);
UnlockCoins();
if(fMasterNode) RelayStatus(darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_RESET);
pwalletMain->Lock();
}
}
}
//
// 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 CTxDSIn s, v.sev) {
if(!s.fHasSig){
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 CTxDSIn s, v.sev) {
if(!s.fHasSig && r > target){
LogPrintf("CDarksendPool::ChargeFees -- found uncooperative node (didn't sign). charging fees.\n");
CWalletTx wtxCollateral = CWalletTx(pwalletMain, v.collateral);
// Broadcast
if (!wtxCollateral.AcceptToMemoryPool(false))
{
// 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()%100;
/*
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 Darkcoin and make it unusable. To
stop these kinds of attacks 1 in 10 successful transactions are charged. This
adds up to a cost of 0.001DRK per transaction on average.
*/
if(r <= 10)
{
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