void Server::handleCommand_Interact(NetworkPacket *pkt)
{
	/*
		[0] u16 command
		[2] u8 action
		[3] u16 item
		[5] u32 length of the next item (plen)
		[9] serialized PointedThing
		[9 + plen] player position information
	*/

	InteractAction action;
	u16 item_i;

	*pkt >> (u8 &)action;
	*pkt >> item_i;

	std::istringstream tmp_is(pkt->readLongString(), std::ios::binary);
	PointedThing pointed;
	pointed.deSerialize(tmp_is);

	verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
			<< item_i << ", pointed=" << pointed.dump() << std::endl;

	session_t peer_id = pkt->getPeerId();
	RemotePlayer *player = m_env->getPlayer(peer_id);

	if (player == NULL) {
		errorstream <<
			"Server::ProcessData(): Canceling: No player for peer_id=" <<
			peer_id << " disconnecting peer!" << std::endl;
		DisconnectPeer(peer_id);
		return;
	}

	PlayerSAO *playersao = player->getPlayerSAO();
	if (playersao == NULL) {
		errorstream <<
			"Server::ProcessData(): Canceling: No player object for peer_id=" <<
			peer_id << " disconnecting peer!" << std::endl;
		DisconnectPeer(peer_id);
		return;
	}

	if (playersao->isDead()) {
		actionstream << "Server: " << player->getName()
				<< " tried to interact while dead; ignoring." << std::endl;
		if (pointed.type == POINTEDTHING_NODE) {
			// Re-send block to revert change on client-side
			RemoteClient *client = getClient(peer_id);
			v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
			client->SetBlockNotSent(blockpos);
		}
		// Call callbacks
		m_script->on_cheat(playersao, "interacted_while_dead");
		return;
	}

	process_PlayerPos(player, playersao, pkt);

	v3f player_pos = playersao->getLastGoodPosition();

	// Update wielded item
	playersao->getPlayer()->setWieldIndex(item_i);

	// Get pointed to node (undefined if not POINTEDTYPE_NODE)
	v3s16 p_under = pointed.node_undersurface;
	v3s16 p_above = pointed.node_abovesurface;

	// Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
	ServerActiveObject *pointed_object = NULL;
	if (pointed.type == POINTEDTHING_OBJECT) {
		pointed_object = m_env->getActiveObject(pointed.object_id);
		if (pointed_object == NULL) {
			verbosestream << "TOSERVER_INTERACT: "
				"pointed object is NULL" << std::endl;
			return;
		}

	}

	v3f pointed_pos_under = player_pos;
	v3f pointed_pos_above = player_pos;
	if (pointed.type == POINTEDTHING_NODE) {
		pointed_pos_under = intToFloat(p_under, BS);
		pointed_pos_above = intToFloat(p_above, BS);
	}
	else if (pointed.type == POINTEDTHING_OBJECT) {
		pointed_pos_under = pointed_object->getBasePosition();
		pointed_pos_above = pointed_pos_under;
	}

	/*
		Make sure the player is allowed to do it
	*/
	if (!checkPriv(player->getName(), "interact")) {
		actionstream << player->getName() << " attempted to interact with " <<
				pointed.dump() << " without 'interact' privilege" << std::endl;

		// Re-send block to revert change on client-side
		RemoteClient *client = getClient(peer_id);
		// Digging completed -> under
		if (action == INTERACT_DIGGING_COMPLETED) {
			v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
			client->SetBlockNotSent(blockpos);
		}
		// Placement -> above
		else if (action == INTERACT_PLACE) {
			v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
			client->SetBlockNotSent(blockpos);
		}
		return;
	}

	/*
		Check that target is reasonably close
		(only when digging or placing things)
	*/
	static thread_local const bool enable_anticheat =
			!g_settings->getBool("disable_anticheat");

	if ((action == INTERACT_START_DIGGING || action == INTERACT_DIGGING_COMPLETED ||
			action == INTERACT_PLACE || action == INTERACT_USE) &&
			enable_anticheat && !isSingleplayer()) {
		float d = playersao->getEyePosition().getDistanceFrom(pointed_pos_under);

		if (!checkInteractDistance(player, d, pointed.dump())) {
			// Re-send block to revert change on client-side
			RemoteClient *client = getClient(peer_id);
			v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
			client->SetBlockNotSent(blockpos);
			return;
		}
	}

	/*
		If something goes wrong, this player is to blame
	*/
	RollbackScopeActor rollback_scope(m_rollback,
			std::string("player:")+player->getName());

	/*
		0: start digging or punch object
	*/
	if (action == INTERACT_START_DIGGING) {
		if (pointed.type == POINTEDTHING_NODE) {
			MapNode n(CONTENT_IGNORE);
			bool pos_ok;

			n = m_env->getMap().getNode(p_under, &pos_ok);
			if (!pos_ok) {
				infostream << "Server: Not punching: Node not found. "
					"Adding block to emerge queue." << std::endl;
				m_emerge->enqueueBlockEmerge(peer_id, getNodeBlockPos(p_above),
					false);
			}

			if (n.getContent() != CONTENT_IGNORE)
				m_script->node_on_punch(p_under, n, playersao, pointed);

			// Cheat prevention
			playersao->noCheatDigStart(p_under);
		}
		else if (pointed.type == POINTEDTHING_OBJECT) {
			// Skip if object can't be interacted with anymore
			if (pointed_object->isGone())
				return;

			ItemStack selected_item, hand_item;
			ItemStack tool_item = playersao->getWieldedItem(&selected_item, &hand_item);
			ToolCapabilities toolcap =
					tool_item.getToolCapabilities(m_itemdef);
			v3f dir = (pointed_object->getBasePosition() -
					(playersao->getBasePosition() + playersao->getEyeOffset())
						).normalize();
			float time_from_last_punch =
				playersao->resetTimeFromLastPunch();

			u16 src_original_hp = pointed_object->getHP();
			u16 dst_origin_hp = playersao->getHP();

			u16 wear = pointed_object->punch(dir, &toolcap, playersao,
					time_from_last_punch);

			// Callback may have changed item, so get it again
			playersao->getWieldedItem(&selected_item);
			bool changed = selected_item.addWear(wear, m_itemdef);
			if (changed)
				playersao->setWieldedItem(selected_item);

			// If the object is a player and its HP changed
			if (src_original_hp != pointed_object->getHP() &&
					pointed_object->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
				SendPlayerHPOrDie((PlayerSAO *)pointed_object,
						PlayerHPChangeReason(PlayerHPChangeReason::PLAYER_PUNCH, playersao));
			}

			// If the puncher is a player and its HP changed
			if (dst_origin_hp != playersao->getHP())
				SendPlayerHPOrDie(playersao,
						PlayerHPChangeReason(PlayerHPChangeReason::PLAYER_PUNCH, pointed_object));
		}

	} // action == INTERACT_START_DIGGING

	/*
		1: stop digging
	*/
	else if (action == INTERACT_STOP_DIGGING) {
	} // action == INTERACT_STOP_DIGGING

	/*
		2: Digging completed
	*/
	else if (action == INTERACT_DIGGING_COMPLETED) {
		// Only digging of nodes
		if (pointed.type == POINTEDTHING_NODE) {
			bool pos_ok;
			MapNode n = m_env->getMap().getNode(p_under, &pos_ok);
			if (!pos_ok) {
				infostream << "Server: Not finishing digging: Node not found. "
					"Adding block to emerge queue." << std::endl;
				m_emerge->enqueueBlockEmerge(peer_id, getNodeBlockPos(p_above),
					false);
			}

			/* Cheat prevention */
			bool is_valid_dig = true;
			if (enable_anticheat && !isSingleplayer()) {
				v3s16 nocheat_p = playersao->getNoCheatDigPos();
				float nocheat_t = playersao->getNoCheatDigTime();
				playersao->noCheatDigEnd();
				// If player didn't start digging this, ignore dig
				if (nocheat_p != p_under) {
					infostream << "Server: " << player->getName()
							<< " started digging "
							<< PP(nocheat_p) << " and completed digging "
							<< PP(p_under) << "; not digging." << std::endl;
					is_valid_dig = false;
					// Call callbacks
					m_script->on_cheat(playersao, "finished_unknown_dig");
				}

				// Get player's wielded item
				// See also: Game::handleDigging
				ItemStack selected_item, hand_item;
				playersao->getPlayer()->getWieldedItem(&selected_item, &hand_item);

				// Get diggability and expected digging time
				DigParams params = getDigParams(m_nodedef->get(n).groups,
						&selected_item.getToolCapabilities(m_itemdef));
				// If can't dig, try hand
				if (!params.diggable) {
					params = getDigParams(m_nodedef->get(n).groups,
						&hand_item.getToolCapabilities(m_itemdef));
				}
				// If can't dig, ignore dig
				if (!params.diggable) {
					infostream << "Server: " << player->getName()
							<< " completed digging " << PP(p_under)
							<< ", which is not diggable with tool; not digging."
							<< std::endl;
					is_valid_dig = false;
					// Call callbacks
					m_script->on_cheat(playersao, "dug_unbreakable");
				}
				// Check digging time
				// If already invalidated, we don't have to
				if (!is_valid_dig) {
					// Well not our problem then
				}
				// Clean and long dig
				else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
					// All is good, but grab time from pool; don't care if
					// it's actually available
					playersao->getDigPool().grab(params.time);
				}
				// Short or laggy dig
				// Try getting the time from pool
				else if (playersao->getDigPool().grab(params.time)) {
					// All is good
				}
				// Dig not possible
				else {
					infostream << "Server: " << player->getName()
							<< " completed digging " << PP(p_under)
							<< "too fast; not digging." << std::endl;
					is_valid_dig = false;
					// Call callbacks
					m_script->on_cheat(playersao, "dug_too_fast");
				}
			}

			/* Actually dig node */

			if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
				m_script->node_on_dig(p_under, n, playersao);

			v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
			RemoteClient *client = getClient(peer_id);
			// Send unusual result (that is, node not being removed)
			if (m_env->getMap().getNode(p_under).getContent() != CONTENT_AIR) {
				// Re-send block to revert change on client-side
				client->SetBlockNotSent(blockpos);
			}
			else {
				client->ResendBlockIfOnWire(blockpos);
			}
		}
	} // action == INTERACT_DIGGING_COMPLETED

	/*
		3: place block or right-click object
	*/
	else if (action == INTERACT_PLACE) {
		ItemStack selected_item;
		playersao->getWieldedItem(&selected_item, nullptr);

		// Reset build time counter
		if (pointed.type == POINTEDTHING_NODE &&
				selected_item.getDefinition(m_itemdef).type == ITEM_NODE)
			getClient(peer_id)->m_time_from_building = 0.0;

		if (pointed.type == POINTEDTHING_OBJECT) {
			// Right click object

			// Skip if object can't be interacted with anymore
			if (pointed_object->isGone())
				return;

			actionstream << player->getName() << " right-clicks object "
					<< pointed.object_id << ": "
					<< pointed_object->getDescription() << std::endl;

			// Do stuff
			if (m_script->item_OnSecondaryUse(
					selected_item, playersao, pointed)) {
				if (playersao->setWieldedItem(selected_item)) {
					SendInventory(playersao, true);
				}
			}

			pointed_object->rightClick(playersao);
		} else if (m_script->item_OnPlace(
				selected_item, playersao, pointed)) {
			// Placement was handled in lua

			// Apply returned ItemStack
			if (playersao->setWieldedItem(selected_item)) {
				SendInventory(playersao, true);
			}
		}

		// If item has node placement prediction, always send the
		// blocks to make sure the client knows what exactly happened
		RemoteClient *client = getClient(peer_id);
		v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
		v3s16 blockpos2 = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
		if (!selected_item.getDefinition(m_itemdef).node_placement_prediction.empty()) {
			client->SetBlockNotSent(blockpos);
			if (blockpos2 != blockpos) {
				client->SetBlockNotSent(blockpos2);
			}
		}
		else {
			client->ResendBlockIfOnWire(blockpos);
			if (blockpos2 != blockpos) {
				client->ResendBlockIfOnWire(blockpos2);
			}
		}
	} // action == INTERACT_PLACE

	/*
		4: use
	*/
	else if (action == INTERACT_USE) {
		ItemStack selected_item;
		playersao->getWieldedItem(&selected_item, nullptr);

		actionstream << player->getName() << " uses " << selected_item.name
				<< ", pointing at " << pointed.dump() << std::endl;

		if (m_script->item_OnUse(
				selected_item, playersao, pointed)) {
			// Apply returned ItemStack
			if (playersao->setWieldedItem(selected_item)) {
				SendInventory(playersao, true);
			}
		}

	} // action == INTERACT_USE

	/*
		5: rightclick air
	*/
	else if (action == INTERACT_ACTIVATE) {
		ItemStack selected_item;
		playersao->getWieldedItem(&selected_item, nullptr);

		actionstream << player->getName() << " activates "
				<< selected_item.name << std::endl;

		pointed.type = POINTEDTHING_NOTHING; // can only ever be NOTHING

		if (m_script->item_OnSecondaryUse(
				selected_item, playersao, pointed)) {
			if (playersao->setWieldedItem(selected_item)) {
				SendInventory(playersao, true);
			}
		}
	} // action == INTERACT_ACTIVATE


	/*
		Catch invalid actions
	*/
	else {
		warningstream << "Server: Invalid action "
				<< action << std::endl;
	}
}
Unknown