masternodeman.cpp

// 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 "masternodeman.h"
#include "activemasternode.h"
#include "darksend.h"
#include "core.h"
#include "util.h"
#include "addrman.h"
#include <boost/lexical_cast.hpp>
#include <boost/filesystem.hpp>


/** Masternode manager */
CMasternodeMan mnodeman;

struct CompareValueOnly
{
    bool operator()(const pair<int64_t, CTxIn>& t1,
                    const pair<int64_t, CTxIn>& t2) const
    {
        return t1.first < t2.first;
    }
};

//
// CMasternodeDB
//

CMasternodeDB::CMasternodeDB()
{
    pathMN = GetDataDir() / "masternodes.dat";
}

bool CMasternodeDB::Write(const CMasternodeMan& mnodemanToSave)
{
    // serialize addresses, checksum data up to that point, then append csum
    CDataStream ssMasternodes(SER_DISK, CLIENT_VERSION);
    ssMasternodes << FLATDATA(Params().MessageStart());
    ssMasternodes << mnodemanToSave;
    uint256 hash = Hash(ssMasternodes.begin(), ssMasternodes.end());
    ssMasternodes << hash;

    // open output file, and associate with CAutoFile
    FILE *file = fopen(pathMN.string().c_str(), "wb");
    CAutoFile fileout = CAutoFile(file, SER_DISK, CLIENT_VERSION);
    if (!fileout)
        return error("%s : Failed to open file %s", __func__, pathMN.string());

    // Write and commit header, data
    try {
        fileout << ssMasternodes;
    }
    catch (std::exception &e) {
        return error("%s : Serialize or I/O error - %s", __func__, e.what());
    }
    FileCommit(fileout);
    fileout.fclose();

    return true;
}

bool CMasternodeDB::Read(CMasternodeMan& mnodemanToLoad)
{
    // open input file, and associate with CAutoFile
    FILE *file = fopen(pathMN.string().c_str(), "rb");
    CAutoFile filein = CAutoFile(file, SER_DISK, CLIENT_VERSION);
    if (!filein)
        return error("%s : Failed to open file %s", __func__, pathMN.string());

    // use file size to size memory buffer
    int fileSize = boost::filesystem::file_size(pathMN);
    int dataSize = fileSize - sizeof(uint256);
    // Don't try to resize to a negative number if file is small
    if (dataSize < 0)
        dataSize = 0;
    vector<unsigned char> vchData;
    vchData.resize(dataSize);
    uint256 hashIn;

    // read data and checksum from file
    try {
        filein.read((char *)&vchData[0], dataSize);
        filein >> hashIn;
    }
    catch (std::exception &e) {
        return error("%s : Deserialize or I/O error - %s", __func__, e.what());
    }
    filein.fclose();

    CDataStream ssMasternodes(vchData, SER_DISK, CLIENT_VERSION);

    // verify stored checksum matches input data
    uint256 hashTmp = Hash(ssMasternodes.begin(), ssMasternodes.end());
    if (hashIn != hashTmp)
        return error("%s : Checksum mismatch, data corrupted", __func__);

    unsigned char pchMsgTmp[4];
    try {
        // de-serialize file header (network specific magic number) and ..
        ssMasternodes >> FLATDATA(pchMsgTmp);

        // ... verify the network matches ours
        if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
            return error("%s : Invalid network magic number", __func__);

        // de-serialize address data into one CMnList object
        ssMasternodes >> mnodemanToLoad;
    }
    catch (std::exception &e) {
        return error("%s : Deserialize or I/O error - %s", __func__, e.what());
        mnodemanToLoad.Clear();
    }

    return true;
}

void DumpMasternodes()
{
    int64_t nStart = GetTimeMillis();

    CMasternodeDB mndb;
    mndb.Write(mnodeman);

    LogPrintf("Flushed info to masternodes.dat  %dms\n", GetTimeMillis() - nStart);
    LogPrintf("  %s\n", mnodeman.ToString());
}

CMasternodeMan::CMasternodeMan() {}

bool CMasternodeMan::Add(CMasternode &mn)
{
    LOCK(cs);

    if (!mn.IsEnabled())
        return false;

    CMasternode *pmn = Find(mn.vin);

    if (pmn == NULL)
    {
        if(fDebug) LogPrintf("CMasternodeMan: Adding new masternode %s - %i now\n", mn.addr.ToString().c_str(), size() + 1);
        vMasternodes.push_back(mn);
        return true;
    }

    return false;
}

void CMasternodeMan::Check()
{
    LOCK(cs);

    BOOST_FOREACH(CMasternode& mn, vMasternodes)
        mn.Check();
}

void CMasternodeMan::CheckAndRemove()
{
    LOCK(cs);

    Check();

    //remove inactive
    vector<CMasternode>::iterator it = vMasternodes.begin();
    while(it != vMasternodes.end()){
        if((*it).activeState == 4 || (*it).activeState == 3){
            if(fDebug) LogPrintf("CMasternodeMan: Removing inactive masternode %s - %i now\n", (*it).addr.ToString().c_str(), size() - 1);
            it = vMasternodes.erase(it);
        } else {
            ++it;
        }
    }

    // check who's asked for the masternode list
    map<CNetAddr, int64_t>::iterator it1 = mAskedUsForMasternodeList.begin();
    while(it1 != mAskedUsForMasternodeList.end()){
        if((*it1).second < GetTime()) {
            mAskedUsForMasternodeList.erase(it1++);
        } else {
            ++it1;
        }
    }

    // check who we asked for the masternode list
    it1 = mWeAskedForMasternodeList.begin();
    while(it1 != mWeAskedForMasternodeList.end()){
        if((*it1).second < GetTime()){
            mWeAskedForMasternodeList.erase(it1++);
        } else {
            ++it1;
        }
    }

    // check which masternodes we've asked for
    map<COutPoint, int64_t>::iterator it2 = mWeAskedForMasternodeListEntry.begin();
    while(it2 != mWeAskedForMasternodeListEntry.end()){
        if((*it2).second < GetTime()){
            mWeAskedForMasternodeListEntry.erase(it2++);
        } else {
            ++it2;
        }
    }

}

void CMasternodeMan::Clear()
{
    LOCK(cs);
    vMasternodes.clear();
    mAskedUsForMasternodeList.clear();
    mWeAskedForMasternodeList.clear();
    mWeAskedForMasternodeListEntry.clear();
}

int CMasternodeMan::CountEnabled()
{
    int i = 0;

    BOOST_FOREACH(CMasternode& mn, vMasternodes) {
        mn.Check();
        if(mn.IsEnabled()) i++;
    }

    return i;
}

int CMasternodeMan::CountMasternodesAboveProtocol(int protocolVersion)
{
    int i = 0;

    BOOST_FOREACH(CMasternode& mn, vMasternodes) {
        mn.Check();
        if(mn.protocolVersion < protocolVersion || !mn.IsEnabled()) continue;
        i++;
    }

    return i;
}

void CMasternodeMan::DsegUpdate(CNode* pnode)
{
    LOCK(cs);

    std::map<CNetAddr, int64_t>::iterator it = mWeAskedForMasternodeList.find(pnode->addr);
    if (it != mWeAskedForMasternodeList.end())
    {
        if (GetTime() < (*it).second) {
            LogPrintf("dseg - we already asked %s for the list; skipping...\n", pnode->addr.ToString());
            return;
        }
    }
    pnode->PushMessage("dseg", CTxIn());
    int64_t askAgain = GetTime() + MASTERNODES_DSEG_SECONDS;
    mWeAskedForMasternodeList[pnode->addr] = askAgain;
}

CMasternode *CMasternodeMan::Find(const CTxIn &vin)
{
    LOCK(cs);

    BOOST_FOREACH(CMasternode& mn, vMasternodes)
    {
        if(mn.vin == vin)
            return &mn;
    }
    return NULL;
}

CMasternode *CMasternodeMan::FindNotInVec(const std::vector<CTxIn> &vVins)
{
    LOCK(cs);

    BOOST_FOREACH(CMasternode &mn, vMasternodes)
    {
        mn.Check();
        if(!mn.IsEnabled()) continue;

        bool found = false;
        BOOST_FOREACH(const CTxIn& vin, vVins)
            if(mn.vin == vin)
            {
                found = true;
                break;
            }

        if(found) continue;

        return &mn;
    }

    return NULL;
}

CMasternode *CMasternodeMan::FindRandom()
{
    LOCK(cs);

    if(size() == 0) return NULL;

    return &vMasternodes[GetRandInt(vMasternodes.size())];
}

CMasternode* CMasternodeMan::GetCurrentMasterNode(int mod, int64_t nBlockHeight, int minProtocol)
{
    unsigned int score = 0;
    CMasternode* winner = NULL;

    // scan for winner
    BOOST_FOREACH(CMasternode& mn, vMasternodes) {
        mn.Check();
        if(mn.protocolVersion < minProtocol || !mn.IsEnabled()) continue;

        // calculate the score for each masternode
        uint256 n = mn.CalculateScore(mod, nBlockHeight);
        unsigned int n2 = 0;
        memcpy(&n2, &n, sizeof(n2));

        // determine the winner
        if(n2 > score){
            score = n2;
            winner = &mn;
        }
    }

    return winner;
}

int CMasternodeMan::GetMasternodeRank(const CTxIn& vin, int64_t nBlockHeight, int minProtocol)
{
    std::vector<pair<unsigned int, CTxIn> > vecMasternodeScores;

    // scan for winner
    BOOST_FOREACH(CMasternode& mn, vMasternodes) {

        mn.Check();

        if(mn.protocolVersion < minProtocol) continue;
        if(!mn.IsEnabled()) {
            continue;
        }

        uint256 n = mn.CalculateScore(1, nBlockHeight);
        unsigned int n2 = 0;
        memcpy(&n2, &n, sizeof(n2));

        vecMasternodeScores.push_back(make_pair(n2, mn.vin));
    }

    sort(vecMasternodeScores.rbegin(), vecMasternodeScores.rend(), CompareValueOnly());

    unsigned int rank = 0;
    BOOST_FOREACH (PAIRTYPE(unsigned int, CTxIn)& s, vecMasternodeScores){
        rank++;
        if(s.second == vin) {
            return rank;
        }
    }

    return -1;
}

void CMasternodeMan::ProcessMessage(CNode* pfrom, std::string& strCommand, CDataStream& vRecv)
{

    if(fLiteMode) return; //disable all darksend/masternode related functionality
    if(IsInitialBlockDownload()) return;

    LOCK(cs);

    if (strCommand == "dsee") { //DarkSend Election Entry

        CTxIn vin;
        CService addr;
        CPubKey pubkey;
        CPubKey pubkey2;
        vector<unsigned char> vchSig;
        int64_t sigTime;
        int count;
        int current;
        int64_t lastUpdated;
        int protocolVersion;
        std::string strMessage;

        // 70047 and greater
        vRecv >> vin >> addr >> vchSig >> sigTime >> pubkey >> pubkey2 >> count >> current >> lastUpdated >> protocolVersion;

        // make sure signature isn't in the future (past is OK)
        if (sigTime > GetAdjustedTime() + 60 * 60) {
            LogPrintf("dsee - Signature rejected, too far into the future %s\n", vin.ToString().c_str());
            return;
        }

        bool isLocal = addr.IsRFC1918() || addr.IsLocal();
        if(RegTest()) isLocal = false;

        std::string vchPubKey(pubkey.begin(), pubkey.end());
        std::string vchPubKey2(pubkey2.begin(), pubkey2.end());

        strMessage = addr.ToString() + boost::lexical_cast<std::string>(sigTime) + vchPubKey + vchPubKey2 + boost::lexical_cast<std::string>(protocolVersion);

        if(protocolVersion < nMasternodeMinProtocol) {
            LogPrintf("dsee - ignoring outdated masternode %s protocol version %d\n", vin.ToString().c_str(), protocolVersion);
            return;
        }

        CScript pubkeyScript;
        pubkeyScript.SetDestination(pubkey.GetID());

        if(pubkeyScript.size() != 25) {
            LogPrintf("dsee - pubkey the wrong size\n");
            Misbehaving(pfrom->GetId(), 100);
            return;
        }

        CScript pubkeyScript2;
        pubkeyScript2.SetDestination(pubkey2.GetID());

        if(pubkeyScript2.size() != 25) {
            LogPrintf("dsee - pubkey2 the wrong size\n");
            Misbehaving(pfrom->GetId(), 100);
            return;
        }

        std::string errorMessage = "";
        if(!darkSendSigner.VerifyMessage(pubkey, vchSig, strMessage, errorMessage)){
            LogPrintf("dsee - Got bad masternode address signature\n");
            Misbehaving(pfrom->GetId(), 100);
            return;
        }

        if(Params().NetworkID() == CChainParams::MAIN){
            if(addr.GetPort() != 9999) return;
        }

        //search existing masternode list, this is where we update existing masternodes with new dsee broadcasts
        CMasternode* pmn = this->Find(vin);
        if(pmn != NULL)
        {
            // count == -1 when it's a new entry
            //   e.g. We don't want the entry relayed/time updated when we're syncing the list
            // mn.pubkey = pubkey, IsVinAssociatedWithPubkey is validated once below,
            //   after that they just need to match
            if(count == -1 && pmn->pubkey == pubkey && !pmn->UpdatedWithin(MASTERNODE_MIN_DSEE_SECONDS)){
                pmn->UpdateLastSeen();

                if(pmn->now < sigTime){ //take the newest entry
                    LogPrintf("dsee - Got updated entry for %s\n", addr.ToString().c_str());
                    pmn->pubkey2 = pubkey2;
                    pmn->now = sigTime;
                    pmn->sig = vchSig;
                    pmn->protocolVersion = protocolVersion;
                    pmn->addr = addr;
                    pmn->Check();
                    if(pmn->IsEnabled())
                        RelayDarkSendElectionEntry(vin, addr, vchSig, sigTime, pubkey, pubkey2, count, current, lastUpdated, protocolVersion);
                }
            }

            return;
        }

        // make sure the vout that was signed is related to the transaction that spawned the masternode
        //  - this is expensive, so it's only done once per masternode
        if(!darkSendSigner.IsVinAssociatedWithPubkey(vin, pubkey)) {
            LogPrintf("dsee - Got mismatched pubkey and vin\n");
            Misbehaving(pfrom->GetId(), 100);
            return;
        }

        if(fDebug) LogPrintf("dsee - Got NEW masternode entry %s\n", addr.ToString().c_str());

        // make sure it's still unspent
        //  - this is checked later by .check() in many places and by ThreadCheckDarkSendPool()

        CValidationState state;
        CTransaction tx = CTransaction();
        CTxOut vout = CTxOut(999.99*COIN, darkSendPool.collateralPubKey);
        tx.vin.push_back(vin);
        tx.vout.push_back(vout);
        if(AcceptableInputs(mempool, state, tx)){
            if(fDebug) LogPrintf("dsee - Accepted masternode entry %i %i\n", count, current);

            if(GetInputAge(vin) < MASTERNODE_MIN_CONFIRMATIONS){
                LogPrintf("dsee - Input must have least %d confirmations\n", MASTERNODE_MIN_CONFIRMATIONS);
                Misbehaving(pfrom->GetId(), 20);
                return;
            }

            // use this as a peer
            addrman.Add(CAddress(addr), pfrom->addr, 2*60*60);

            // add our masternode
            CMasternode mn(addr, vin, pubkey, vchSig, sigTime, pubkey2, protocolVersion);
            mn.UpdateLastSeen(lastUpdated);
            this->Add(mn);

            // if it matches our masternodeprivkey, then we've been remotely activated
            if(pubkey2 == activeMasternode.pubKeyMasternode && protocolVersion == PROTOCOL_VERSION){
                activeMasternode.EnableHotColdMasterNode(vin, addr);
            }

            if(count == -1 && !isLocal)
                RelayDarkSendElectionEntry(vin, addr, vchSig, sigTime, pubkey, pubkey2, count, current, lastUpdated, protocolVersion);

        } else {
            LogPrintf("dsee - Rejected masternode entry %s\n", addr.ToString().c_str());

            int nDoS = 0;
            if (state.IsInvalid(nDoS))
            {
                LogPrintf("dsee - %s from %s %s was not accepted into the memory pool\n", tx.GetHash().ToString().c_str(),
                    pfrom->addr.ToString().c_str(), pfrom->cleanSubVer.c_str());
                if (nDoS > 0)
                    Misbehaving(pfrom->GetId(), nDoS);
            }
        }
    }

    else if (strCommand == "dseep") { //DarkSend Election Entry Ping

        CTxIn vin;
        vector<unsigned char> vchSig;
        int64_t sigTime;
        bool stop;
        vRecv >> vin >> vchSig >> sigTime >> stop;

        //LogPrintf("dseep - Received: vin: %s sigTime: %lld stop: %s\n", vin.ToString().c_str(), sigTime, stop ? "true" : "false");

        if (sigTime > GetAdjustedTime() + 60 * 60) {
            LogPrintf("dseep - Signature rejected, too far into the future %s\n", vin.ToString().c_str());
            return;
        }

        if (sigTime <= GetAdjustedTime() - 60 * 60) {
            LogPrintf("dseep - Signature rejected, too far into the past %s - %d %d \n", vin.ToString().c_str(), sigTime, GetAdjustedTime());
            return;
        }

        // see if we have this masternode
        CMasternode* pmn = this->Find(vin);
        if(pmn != NULL)
        {
            // LogPrintf("dseep - Found corresponding mn for vin: %s\n", vin.ToString().c_str());
            // take this only if it's newer
            if(pmn->lastDseep < sigTime)
            {
                std::string strMessage = pmn->addr.ToString() + boost::lexical_cast<std::string>(sigTime) + boost::lexical_cast<std::string>(stop);

                std::string errorMessage = "";
                if(!darkSendSigner.VerifyMessage(pmn->pubkey2, vchSig, strMessage, errorMessage))
                {
                    LogPrintf("dseep - Got bad masternode address signature %s \n", vin.ToString().c_str());
                    //Misbehaving(pfrom->GetId(), 100);
                    return;
                }

                pmn->lastDseep = sigTime;

                if(!pmn->UpdatedWithin(MASTERNODE_MIN_DSEEP_SECONDS))
                {
                    if(stop) pmn->Disable();
                    else
                    {
                        pmn->UpdateLastSeen();
                        pmn->Check();
                        if(!pmn->IsEnabled()) return;
                    }
                    RelayDarkSendElectionEntryPing(vin, vchSig, sigTime, stop);
                }
            }
            return;
        }

        if(fDebug) LogPrintf("dseep - Couldn't find masternode entry %s\n", vin.ToString().c_str());

        std::map<COutPoint, int64_t>::iterator i = mWeAskedForMasternodeListEntry.find(vin.prevout);
        if (i != mWeAskedForMasternodeListEntry.end())
        {
            int64_t t = (*i).second;
            if (GetTime() < t) return; // we've asked recently
        }

        // ask for the dsee info once from the node that sent dseep

        LogPrintf("dseep - Asking source node for missing entry %s\n", vin.ToString().c_str());
        pfrom->PushMessage("dseg", vin);
        int64_t askAgain = GetTime() + MASTERNODE_MIN_DSEEP_SECONDS;
        mWeAskedForMasternodeListEntry[vin.prevout] = askAgain;

    } else if (strCommand == "dseg") { //Get masternode list or specific entry

        CTxIn vin;
        vRecv >> vin;

        if(vin == CTxIn()) { //only should ask for this once
            //local network
            if(!pfrom->addr.IsRFC1918() && Params().NetworkID() == CChainParams::MAIN)
            {
                std::map<CNetAddr, int64_t>::iterator i = mAskedUsForMasternodeList.find(pfrom->addr);
                if (i != mAskedUsForMasternodeList.end())
                {
                    int64_t t = (*i).second;
                    if (GetTime() < t) {
                        Misbehaving(pfrom->GetId(), 34);
                        LogPrintf("dseg - peer already asked me for the list\n");
                        return;
                    }
                }
                int64_t askAgain = GetTime() + MASTERNODES_DSEG_SECONDS;
                mAskedUsForMasternodeList[pfrom->addr] = askAgain;
            }
        } //else, asking for a specific node which is ok

        int count = this->size();
        int i = 0;

        BOOST_FOREACH(CMasternode& mn, vMasternodes) {

            if(mn.addr.IsRFC1918()) continue; //local network

            if(mn.IsEnabled())
            {
                if(fDebug) LogPrintf("dseg - Sending masternode entry - %s \n", mn.addr.ToString().c_str());
                if(vin == CTxIn()){
                    pfrom->PushMessage("dsee", mn.vin, mn.addr, mn.sig, mn.now, mn.pubkey, mn.pubkey2, count, i, mn.lastTimeSeen, mn.protocolVersion);
                } else if (vin == mn.vin) {
                    pfrom->PushMessage("dsee", mn.vin, mn.addr, mn.sig, mn.now, mn.pubkey, mn.pubkey2, count, i, mn.lastTimeSeen, mn.protocolVersion);
                    LogPrintf("dseg - Sent 1 masternode entries to %s\n", pfrom->addr.ToString().c_str());
                    return;
                }
                i++;
            }
        }

        LogPrintf("dseg - Sent %d masternode entries to %s\n", i, pfrom->addr.ToString().c_str());
    }

}

std::string CMasternodeMan::ToString()
{
    std::ostringstream info;

    info << "masternodes: " << (int)vMasternodes.size() <<
            ", peers who asked us for masternode list: " << (int)mAskedUsForMasternodeList.size() <<
            ", peers we asked for masternode list: " << (int)mWeAskedForMasternodeList.size() <<
            ", entries in masternode list we asked for: " << (int)mWeAskedForMasternodeListEntry.size();

    return info.str();
}