// Encode a byte sequence as a base58-encoded string std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend) { CAutoBN_CTX pctx; CBigNum bn58 = 58; CBigNum bn0 = 0; // Convert big endian data to little endian // Extra zero at the end make sure bignum will interpret as a positive number std::vector<unsigned char> vchTmp(pend-pbegin+1, 0); reverse_copy(pbegin, pend, vchTmp.begin()); // Convert little endian data to bignum CBigNum bn; bn.setvch(vchTmp); // Convert bignum to std::string std::string str; // Expected size increase from base58 conversion is approximately 137% // use 138% to be safe str.reserve((pend - pbegin) * 138 / 100 + 1); CBigNum dv; CBigNum rem; while (bn > bn0) { if (!BN_div(&dv, &rem, &bn, &bn58, pctx)) throw bignum_error("EncodeBase58 : BN_div failed"); bn = dv; unsigned int c = rem.getuint32(); str += pszBase58[c]; } // Leading zeroes encoded as base58 zeros for (const unsigned char* p = pbegin; p < pend && *p == 0; p++) str += pszBase58[0]; // Convert little endian std::string to big endian reverse(str.begin(), str.end()); return str; }
void ThreadSendAlert() { if (!mapArgs.count("-sendalert") && !mapArgs.count("-printalert")) return; MilliSleep(60*1000); // Wait a minute so we get connected // // Alerts are relayed around the network until nRelayUntil, flood // filling to every node. // After the relay time is past, new nodes are told about alerts // when they connect to peers, until either nExpiration or // the alert is cancelled by a newer alert. // Nodes never save alerts to disk, they are in-memory-only. // CAlert alert; alert.nRelayUntil = GetTime() + 15 * 60; alert.nExpiration = GetTime() + 365 * 60 * 60; alert.nID = 1000; // use https://github.com/zcash/zcash/wiki/specification#assigned-numbers to keep track of alert IDs alert.nCancel = 0; // cancels previous messages up to this ID number // These versions are protocol versions // 170002 : 1.0.0 alert.nMinVer = 170002; alert.nMaxVer = 170002; // // main.cpp: // 1000 for Misc warnings like out of disk space and clock is wrong // 2000 for longer invalid proof-of-work chain // Higher numbers mean higher priority // 4000 or higher will put the RPC into safe mode alert.nPriority = 5000; alert.strComment = ""; alert.strStatusBar = "URGENT: Upgrade required: see https://z.cash"; alert.strRPCError = "URGENT: Upgrade required: see https://z.cash"; // Set specific client version/versions here. If setSubVer is empty, no filtering on subver is done: // alert.setSubVer.insert(std::string("/MagicBean:0.7.2/")); // Sign const CChainParams& chainparams = Params(); std::string networkID = chainparams.NetworkIDString(); bool fIsTestNet = networkID.compare("test") == 0; std::vector<unsigned char> vchTmp(ParseHex(fIsTestNet ? pszTestNetPrivKey : pszPrivKey)); CPrivKey vchPrivKey(vchTmp.begin(), vchTmp.end()); CDataStream sMsg(SER_NETWORK, CLIENT_VERSION); sMsg << *(CUnsignedAlert*)&alert; alert.vchMsg = std::vector<unsigned char>(sMsg.begin(), sMsg.end()); CKey key; if (!key.SetPrivKey(vchPrivKey, false)) { printf("ThreadSendAlert() : key.SetPrivKey failed\n"); return; } if (!key.Sign(Hash(alert.vchMsg.begin(), alert.vchMsg.end()), alert.vchSig)) { printf("ThreadSendAlert() : key.Sign failed\n"); return; } // Test CDataStream sBuffer(SER_NETWORK, CLIENT_VERSION); sBuffer << alert; CAlert alert2; sBuffer >> alert2; if (!alert2.CheckSignature(chainparams.AlertKey())) { printf("ThreadSendAlert() : CheckSignature failed\n"); return; } assert(alert2.vchMsg == alert.vchMsg); assert(alert2.vchSig == alert.vchSig); alert.SetNull(); printf("\nThreadSendAlert:\n"); printf("hash=%s\n", alert2.GetHash().ToString().c_str()); printf("%s\n", alert2.ToString().c_str()); printf("vchMsg=%s\n", HexStr(alert2.vchMsg).c_str()); printf("vchSig=%s\n", HexStr(alert2.vchSig).c_str()); // Confirm if (!mapArgs.count("-sendalert")) return; while (vNodes.size() < 1 && !ShutdownRequested()) MilliSleep(500); if (ShutdownRequested()) return; // Send printf("ThreadSendAlert() : Sending alert\n"); int nSent = 0; { LOCK(cs_vNodes); BOOST_FOREACH(CNode* pnode, vNodes) { if (alert2.RelayTo(pnode)) { printf("ThreadSendAlert() : Sent alert to %s\n", pnode->addr.ToString().c_str()); nSent++; } } } printf("ThreadSendAlert() : Alert sent to %d nodes\n", nSent); }