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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>
#include <openssl/rand.h>
using namespace std;
using namespace boost;
// 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 - DASH **********
Copyright (c) 2014-2015, Dash Developers
eduffield - evan@dashpay.io
udjinm6 - udjinm6@dashpay.io
*/
void CDarksendPool::ProcessMessageDarksend(CNode* pfrom, std::string& strCommand, CDataStream& vRecv)
{
if(fLiteMode) return; //disable all darksend/Masternode related functionality
if(!IsBlockchainSynced()) 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", pfrom->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
TRY_LOCK(cs_darksend, lockRecv);
if(!lockRecv) return;
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){
LogPrintf("Darksend queue is ready - %s\n", addr.ToString().c_str());
PrepareDarksendDenominate();
}
} else {
BOOST_FOREACH(CDarksendQueue q, vecDarksendQueue){
if(q.vin == dsq.vin) return;
}
LogPrint("darksend", "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){
LogPrint("darksend", "dsq -- Masternode sending too many dsq messages. %s \n", pmn->addr.ToString().c_str());
return;
}
mnodeman.nDsqCount++;
pmn->nLastDsq = mnodeman.nDsqCount;
pmn->allowFreeTx = true;
LogPrint("darksend", "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 < 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);
LogPrint("darksend", "dsi -- tx in %s\n", i.ToString().c_str());
CTransaction tx2;
uint256 hash;
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", 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, tx, false, NULL, false, true)){
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;
LogPrint("darksend", "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;
LogPrint("darksend", " -- sigs count %d %d\n", (int)sigs.size(), count);
count++;
}
if(success){
darkSendPool.Check();
RelayStatus(darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.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){
LogPrint("darksend", "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;
int errorID;
vRecv >> sessionIDMessage >> error >> errorID;
if(sessionID != sessionIDMessage){
LogPrint("darksend", "dsc - message doesn't match current darksend session %d %d\n", darkSendPool.sessionID, sessionIDMessage);
return;
}
darkSendPool.CompletedTransaction(error, errorID);
}
}
int randomizeList (int i) { return std::rand()%i;}
void CDarksendPool::Reset(){
cachedLastSuccess = 0;
lastNewBlock = 0;
txCollateral = CTransaction();
vecMasternodesUsed.clear();
UnlockCoins();
SetNull();
}
void CDarksendPool::SetNull(){
// MN side
sessionUsers = 0;
vecSessionCollateral.clear();
// Client side
entriesCount = 0;
lastEntryAccepted = 0;
countEntriesAccepted = 0;
sessionFoundMasternode = false;
// Both sides
state = POOL_STATUS_IDLE;
sessionID = 0;
sessionDenom = 0;
entries.clear();
finalTransaction.vin.clear();
finalTransaction.vout.clear();
lastTimeChanged = GetTimeMillis();
// -- 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){
CSQRcoincoinAddress 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(){
while(true) {
TRY_LOCK(pwalletMain->cs_wallet, lockWallet);
if(!lockWallet) {MilliSleep(50); continue;}
BOOST_FOREACH(CTxIn v, lockedCoins)
pwalletMain->UnlockCoin(v.prevout);
break;
}
lockedCoins.clear();
}
/// from masternode-sync.cpp
bool CDarksendPool::IsBlockchainSynced()
{
static bool fBlockchainSynced = false;
static int64_t lastProcess = GetTime();
// if the last call to this function was more than 60 minutes ago (client was in sleep mode) reset the sync process
if(GetTime() - lastProcess > 60*60) {
Reset();
fBlockchainSynced = false;
}
lastProcess = GetTime();
if(fBlockchainSynced) return true;
if (fImporting || fReindex) return false;
TRY_LOCK(cs_main, lockMain);
if(!lockMain) return false;
CBlockIndex* pindex = pindexBest;
if(pindex == NULL) return false;
if(pindex->nTime + 60*60 < GetTime())
return false;
fBlockchainSynced = true;
return true;
}
std::string CDarksendPool::GetStatus()
{
static int showingDarkSendMessage = 0;
showingDarkSendMessage+=10;
std::string suffix = "";
if(pindexBest->nHeight - cachedLastSuccess < minBlockSpacing ||!IsBlockchainSynced()) {
return strAutoDenomResult;
}
switch(state) {
case POOL_STATUS_IDLE:
return _("Darksend is idle.");
case POOL_STATUS_ACCEPTING_ENTRIES:
if(entriesCount == 0) {
showingDarkSendMessage = 0;
return strAutoDenomResult;
} else if (lastEntryAccepted == 1) {
if(showingDarkSendMessage % 10 > 8) {
lastEntryAccepted = 0;
showingDarkSendMessage = 0;
}
return _("Darksend request complete:") + " " + _("Your transaction was accepted into the pool!");
} else {
std::string suffix = "";
if( showingDarkSendMessage % 70 <= 40) return strprintf(_("Submitted following entries to masternode: %u / %d"), entriesCount, GetMaxPoolTransactions());
else if(showingDarkSendMessage % 70 <= 50) suffix = ".";
else if(showingDarkSendMessage % 70 <= 60) suffix = "..";
else if(showingDarkSendMessage % 70 <= 70) suffix = "...";
return strprintf(_("Submitted to masternode, waiting for more entries ( %u / %d ) %s"), entriesCount, GetMaxPoolTransactions(), suffix);
}
case POOL_STATUS_SIGNING:
if( showingDarkSendMessage % 70 <= 40) return _("Found enough users, signing ...");
else if(showingDarkSendMessage % 70 <= 50) suffix = ".";
else if(showingDarkSendMessage % 70 <= 60) suffix = "..";
else if(showingDarkSendMessage % 70 <= 70) suffix = "...";
return strprintf(_("Found enough users, signing ( waiting %s )"), suffix);
case POOL_STATUS_TRANSMISSION:
return _("Transmitting final transaction.");
case POOL_STATUS_FINALIZE_TRANSACTION:
return _("Finalizing transaction.");
case POOL_STATUS_ERROR:
return _("Darksend request incomplete:") + " " + lastMessage + " " + _("Will retry...");
case POOL_STATUS_SUCCESS:
return _("Darksend request complete:") + " " + lastMessage;
case POOL_STATUS_QUEUE:
if( showingDarkSendMessage % 70 <= 30) suffix = ".";
else if(showingDarkSendMessage % 70 <= 50) suffix = "..";
else if(showingDarkSendMessage % 70 <= 70) suffix = "...";
return strprintf(_("Submitted to masternode, waiting in queue %s"), suffix);;
default:
return strprintf(_("Unknown state: id = %u"), state);
}
}
//
// Check the Darksend progress and send client updates if a Masternode
//
void CDarksendPool::Check()
{
if(fMasterNode) LogPrint("darksend", "CDarksendPool::Check() - entries count %lu\n", entries.size());
//printf("CDarksendPool::Check() %d - %d - %d\n", state, anonTx.CountEntries(), GetTimeMillis()-lastTimeChanged);
if(fMasterNode) {
LogPrint("darksend", "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())
{
LogPrint("darksend", "CDarksendPool::Check() -- TRYING TRANSACTION \n");
UpdateState(POOL_STATUS_FINALIZE_TRANSACTION);
}
}
// create the finalized transaction for distribution to the clients
if(state == POOL_STATUS_FINALIZE_TRANSACTION) {
LogPrint("darksend", "CDarksendPool::Check() -- FINALIZE TRANSACTIONS\n");
UpdateState(POOL_STATUS_SIGNING);
if (fMasterNode) {
CTransaction txNew;
// make our new transaction
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);
LogPrint("darksend", "Transaction 1: %s\n", txNew.ToString());
finalTransaction = txNew;
// request signatures from clients
RelayFinalTransaction(sessionID, finalTransaction);
}
}
// If we have all of the signatures, try to compile the transaction
if(fMasterNode && state == POOL_STATUS_SIGNING && SignaturesComplete()) {
LogPrint("darksend", "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) {
LogPrint("darksend", "CDarksendPool::Check() -- timeout, RESETTING\n");
UnlockCoins();
SetNull();
if(fMasterNode) RelayStatus(sessionID, GetState(), GetEntriesCount(), MASTERNODE_RESET);
}
}
void CDarksendPool::CheckFinalTransaction()
{
if (!fMasterNode) return; // check and relay final tx only on masternode
CWalletTx txNew = CWalletTx(pwalletMain, finalTransaction);
LOCK2(cs_main, pwalletMain->cs_wallet);
{
LogPrint("darksend", "Transaction 2: %s\n", txNew.ToString());
// See if the transaction is valid
if (!txNew.AcceptToMemoryPool(false, true, true))
{
LogPrintf("CDarksendPool::Check() - CommitTransaction : Error: Transaction not valid\n");
SetNull();
// not much we can do in this case
UpdateState(POOL_STATUS_ACCEPTING_ENTRIES);
RelayCompletedTransaction(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);
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;
}
string txHash = txNew.GetHash().ToString().c_str();
LogPrintf("CDarksendPool::Check() -- txHash %d \n", txHash);
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));
}
CInv inv(MSG_DSTX, txNew.GetHash());
RelayInventory(inv);
// Tell the clients it was successful
RelayCompletedTransaction(sessionID, false, _("Transaction created successfully."));
// Randomly charge clients
ChargeRandomFees();
// Reset
LogPrint("darksend", "CDarksendPool::Check() -- COMPLETED -- RESETTING \n");
SetNull();
RelayStatus(sessionID, GetState(), GetEntriesCount(), MASTERNODE_RESET);
}
}
//
// 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) return;
//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 >= Params().PoolMaxTransactions()-1 && r > 33) return;
//everyone is an offender? That's not right
if(offences >= Params().PoolMaxTransactions()) 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 SQRcoin and make it unusable. To
stop these kinds of attacks 1 in 50 successful transactions are charged. This
adds up to a cost of 0.002SQR 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
if(!fMasterNode) {
switch(state) {
case POOL_STATUS_TRANSMISSION:
LogPrint("darksend", "CDarksendPool::CheckTimeout() -- Session complete -- Running Check()\n");
Check();
break;
case POOL_STATUS_ERROR:
LogPrint("darksend", "CDarksendPool::CheckTimeout() -- Pool error -- Running Check()\n");
Check();
break;
case POOL_STATUS_SUCCESS:
LogPrint("darksend", "CDarksendPool::CheckTimeout() -- Pool success -- Running Check()\n");
Check();
break;
}
}
// check Darksend queue objects for timeouts
int c = 0;
vector<CDarksendQueue>::iterator it = vecDarksendQueue.begin();
while(it != vecDarksendQueue.end()){
if((*it).IsExpired()){
LogPrint("darksend", "CDarksendPool::CheckTimeout() : Removing expired queue entry - %d\n", c);
it = vecDarksendQueue.erase(it);
} else ++it;
c++;
}
int addLagTime = 0;
if(!fMasterNode) addLagTime = 10000; //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;
// check for a timeout and reset if needed
vector<CDarkSendEntry>::iterator it2 = entries.begin();
while(it2 != entries.end()){
if((*it2).IsExpired()){
LogPrint("darksend", "CDarksendPool::CheckTimeout() : Removing expired entry - %d\n", c);
it2 = entries.erase(it2);
if(entries.size() == 0){
UnlockCoins();
SetNull();
}
if(fMasterNode){
RelayStatus(sessionID, GetState(), GetEntriesCount(), MASTERNODE_RESET);
}
} else ++it2;
c++;
}
if(GetTimeMillis()-lastTimeChanged >= (DARKSEND_QUEUE_TIMEOUT*1000)+addLagTime){
UnlockCoins();
SetNull();
}
} else if(GetTimeMillis()-lastTimeChanged >= (DARKSEND_QUEUE_TIMEOUT*1000)+addLagTime){
LogPrint("darksend", "CDarksendPool::CheckTimeout() -- Session timed out (%ds) -- resetting\n", DARKSEND_QUEUE_TIMEOUT);
UnlockCoins();
SetNull();
UpdateState(POOL_STATUS_ERROR);
lastMessage = _("Session timed out.");
}
if(state == POOL_STATUS_SIGNING && GetTimeMillis()-lastTimeChanged >= (DARKSEND_SIGNING_TIMEOUT*1000)+addLagTime ) {
LogPrint("darksend", "CDarksendPool::CheckTimeout() -- Session timed out (%ds) -- restting\n", DARKSEND_SIGNING_TIMEOUT);
ChargeFees();
UnlockCoins();
SetNull();
UpdateState(POOL_STATUS_ERROR);
lastMessage = _("Signing timed out.");
}
}
//
// Check for complete queue
//
void CDarksendPool::CheckForCompleteQueue(){
if(!fEnableDarksend && !fMasterNode) return;
/* Check to see if we're ready for submissions from clients */
//
// After receiving multiple dsa messages, the queue will switch to "accepting entries"
// which is the active state right before merging the transaction
//
if(state == POOL_STATUS_QUEUE && sessionUsers == GetMaxPoolTransactions()) {
UpdateState(POOL_STATUS_ACCEPTING_ENTRIES);
CDarksendQueue dsq;
dsq.nDenom = sessionDenom;
dsq.vin = activeMasternode.vin;
dsq.time = GetTime();
dsq.ready = true;
dsq.Sign();
dsq.Relay();
}
}
// 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 CTxDSIn& s, e.sev){
txNew.vin.push_back(s);
if(s == newVin){
found = i;
sigPubKey = s.prevPubKey;
}
i++;
}
}
if(found >= 0){ //might have to do this one input at a time?
int n = found;
txNew.vin[n].scriptSig = newSig;
LogPrint("darksend", "CDarksendPool::SignatureValid() - Sign with sig %s\n", newSig.ToString().substr(0,24));
if (!VerifyScript(txNew.vin[n].scriptSig, sigPubKey, txNew, n, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, 0)){
LogPrint("darksend", "CDarksendPool::SignatureValid() - Signing - Error signing input %u\n", n);
return false;
}
}
LogPrint("darksend", "CDarksendPool::SignatureValid() - Signing - Successfully validated 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());
return false;
}
}
BOOST_FOREACH(const CTxIn i, txCollateral.vin){
CTransaction tx2;
uint256 hash;
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){
LogPrint("darksend", "CDarksendPool::IsCollateralValid - Unknown inputs in collateral transaction - %s\n", txCollateral.ToString());
return false;
}
//collateral transactions are required to pay out DARKSEND_COLLATERAL as a fee to the miners
if(nValueIn-nValueOut < DARKSEND_COLLATERAL) {
LogPrint("darksend", "CDarksendPool::IsCollateralValid - did not include enough fees in transaction %d\n%s\n", nValueOut-nValueIn, txCollateral.ToString());
return false;
}
LogPrint("darksend", "CDarksendPool::IsCollateralValid %s\n", txCollateral.ToString());
{