Method HandleDatabaseLookupMsg

libi2pd/NetDb.cpp:943–1102

	}

	void NetDb::HandleDatabaseLookupMsg (std::shared_ptr<const I2NPMessage> msg)
	{
		const uint8_t * buf = msg->GetPayload ();
		IdentHash ident (buf);
		if (ident.IsZero ())
		{
			LogPrint (eLogError, "NetDb: DatabaseLookup for zero ident. Ignored");
			return;
		}
		std::string key;
		if (CheckLogLevel (eLogInfo))
			key = i2p::data::ByteStreamToBase64 (buf, 32);

		IdentHash replyIdent(buf + 32);
		uint8_t flag = buf[64];

		LogPrint (eLogDebug, "NetDb: DatabaseLookup for ", key, " received flags=", (int)flag);
		uint8_t lookupType = flag & DATABASE_LOOKUP_TYPE_FLAGS_MASK;
		const uint8_t * excluded = buf + 65;
		uint32_t replyTunnelID = 0;
		if (flag & DATABASE_LOOKUP_DELIVERY_FLAG) //reply to tunnel
		{
			replyTunnelID = bufbe32toh (excluded);
			excluded += 4;
		}
		uint16_t numExcluded = bufbe16toh (excluded);
		excluded += 2;
		if (numExcluded > 512 || (excluded - buf) + numExcluded*32 > (int)msg->GetPayloadLength ())
		{
			LogPrint (eLogWarning, "NetDb: Number of excluded peers", numExcluded, " is too much");
			return;
		}

		std::shared_ptr<I2NPMessage> replyMsg;
		if (lookupType == DATABASE_LOOKUP_TYPE_EXPLORATORY_LOOKUP)
		{
			if (!context.IsFloodfill ())
			{
				LogPrint (eLogWarning, "NetDb: Exploratory lookup to non-floodfill dropped");
				return;
			}
			LogPrint (eLogInfo, "NetDb: Exploratory close to ", key, " ", numExcluded, " excluded");
			std::unordered_set<IdentHash> excludedRouters;
			const uint8_t * excluded_ident = excluded;
			for (int i = 0; i < numExcluded; i++)
			{
				excludedRouters.insert (excluded_ident);
				excluded_ident += 32;
			}
			replyMsg = CreateDatabaseSearchReply (ident, GetExploratoryNonFloodfill (ident,
				NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES, excludedRouters));
		}
		else
		{
			if (lookupType == DATABASE_LOOKUP_TYPE_ROUTERINFO_LOOKUP ||
				lookupType == DATABASE_LOOKUP_TYPE_NORMAL_LOOKUP)
			{
				// try to find router