minetest/src/server.cpp

/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "server.h"
#include <iostream>
#include <queue>
#include <algorithm>
#include "clientserver.h"
#include "ban.h"
#include "environment.h"
#include "map.h"
#include "jthread/jmutexautolock.h"
#include "main.h"
#include "constants.h"
#include "voxel.h"
#include "config.h"
#include "version.h"
#include "filesys.h"
#include "mapblock.h"
#include "serverobject.h"
#include "genericobject.h"
#include "settings.h"
#include "profiler.h"
#include "log.h"
#include "scripting_game.h"
#include "nodedef.h"
#include "itemdef.h"
#include "craftdef.h"
#include "emerge.h"
#include "mapgen.h"
#include "mg_biome.h"
#include "content_mapnode.h"
#include "content_nodemeta.h"
#include "content_abm.h"
#include "content_sao.h"
#include "mods.h"
#include "sha1.h"
#include "base64.h"
#include "tool.h"
#include "sound.h" // dummySoundManager
#include "event_manager.h"
#include "hex.h"
#include "serverlist.h"
#include "util/string.h"
#include "util/pointedthing.h"
#include "util/mathconstants.h"
#include "rollback.h"
#include "util/serialize.h"
#include "util/thread.h"
#include "defaultsettings.h"

class ClientNotFoundException : public BaseException
{
public:
	ClientNotFoundException(const char *s):
		BaseException(s)
	{}
};

class ServerThread : public JThread
{
	Server *m_server;

public:

	ServerThread(Server *server):
		JThread(),
		m_server(server)
	{
	}

	void * Thread();
};

void * ServerThread::Thread()
{
	log_register_thread("ServerThread");

	DSTACK(__FUNCTION_NAME);
	BEGIN_DEBUG_EXCEPTION_HANDLER

	m_server->AsyncRunStep(true);

	ThreadStarted();

	porting::setThreadName("ServerThread");

	while(!StopRequested())
	{
		try{
			//TimeTaker timer("AsyncRunStep() + Receive()");

			m_server->AsyncRunStep();

			m_server->Receive();

		}
		catch(con::NoIncomingDataException &e)
		{
		}
		catch(con::PeerNotFoundException &e)
		{
			infostream<<"Server: PeerNotFoundException"<<std::endl;
		}
		catch(ClientNotFoundException &e)
		{
		}
		catch(con::ConnectionBindFailed &e)
		{
			m_server->setAsyncFatalError(e.what());
		}
		catch(LuaError &e)
		{
			m_server->setAsyncFatalError(e.what());
		}
	}

	END_DEBUG_EXCEPTION_HANDLER(errorstream)

	return NULL;
}

v3f ServerSoundParams::getPos(ServerEnvironment *env, bool *pos_exists) const
{
	if(pos_exists) *pos_exists = false;
	switch(type){
	case SSP_LOCAL:
		return v3f(0,0,0);
	case SSP_POSITIONAL:
		if(pos_exists) *pos_exists = true;
		return pos;
	case SSP_OBJECT: {
		if(object == 0)
			return v3f(0,0,0);
		ServerActiveObject *sao = env->getActiveObject(object);
		if(!sao)
			return v3f(0,0,0);
		if(pos_exists) *pos_exists = true;
		return sao->getBasePosition(); }
	}
	return v3f(0,0,0);
}



/*
	Server
*/

Server::Server(
		const std::string &path_world,
		const SubgameSpec &gamespec,
		bool simple_singleplayer_mode,
		bool ipv6
	):
	m_path_world(path_world),
	m_gamespec(gamespec),
	m_simple_singleplayer_mode(simple_singleplayer_mode),
	m_async_fatal_error(""),
	m_env(NULL),
	m_con(PROTOCOL_ID,
			512,
			CONNECTION_TIMEOUT,
			ipv6,
			this),
	m_banmanager(NULL),
	m_rollback(NULL),
	m_enable_rollback_recording(false),
	m_emerge(NULL),
	m_script(NULL),
	m_itemdef(createItemDefManager()),
	m_nodedef(createNodeDefManager()),
	m_craftdef(createCraftDefManager()),
	m_event(new EventManager()),
	m_thread(NULL),
	m_time_of_day_send_timer(0),
	m_uptime(0),
	m_clients(&m_con),
	m_shutdown_requested(false),
	m_ignore_map_edit_events(false),
	m_ignore_map_edit_events_peer_id(0)

{
	m_liquid_transform_timer = 0.0;
	m_liquid_transform_every = 1.0;
	m_print_info_timer = 0.0;
	m_masterserver_timer = 0.0;
	m_objectdata_timer = 0.0;
	m_emergethread_trigger_timer = 0.0;
	m_savemap_timer = 0.0;

	m_step_dtime = 0.0;
	m_lag = g_settings->getFloat("dedicated_server_step");

	if(path_world == "")
		throw ServerError("Supplied empty world path");

	if(!gamespec.isValid())
		throw ServerError("Supplied invalid gamespec");

	infostream<<"Server created for gameid \""<<m_gamespec.id<<"\"";
	if(m_simple_singleplayer_mode)
		infostream<<" in simple singleplayer mode"<<std::endl;
	else
		infostream<<std::endl;
	infostream<<"- world:  "<<m_path_world<<std::endl;
	infostream<<"- game:   "<<m_gamespec.path<<std::endl;

	// Initialize default settings and override defaults with those provided
	// by the game
	set_default_settings(g_settings);
	Settings gamedefaults;
	getGameMinetestConfig(gamespec.path, gamedefaults);
	override_default_settings(g_settings, &gamedefaults);

	// Create server thread
	m_thread = new ServerThread(this);

	// Create emerge manager
	m_emerge = new EmergeManager(this);

	// Create world if it doesn't exist
	if(!initializeWorld(m_path_world, m_gamespec.id))
		throw ServerError("Failed to initialize world");

	// Create ban manager
	std::string ban_path = m_path_world + DIR_DELIM "ipban.txt";
	m_banmanager = new BanManager(ban_path);

	// Create rollback manager
	m_rollback = new RollbackManager(m_path_world, this);

	ModConfiguration modconf(m_path_world);
	m_mods = modconf.getMods();
	std::vector<ModSpec> unsatisfied_mods = modconf.getUnsatisfiedMods();
	// complain about mods with unsatisfied dependencies
	if(!modconf.isConsistent())
	{
		for(std::vector<ModSpec>::iterator it = unsatisfied_mods.begin();
			it != unsatisfied_mods.end(); ++it)
		{
			ModSpec mod = *it;
			errorstream << "mod \"" << mod.name << "\" has unsatisfied dependencies: ";
			for(std::set<std::string>::iterator dep_it = mod.unsatisfied_depends.begin();
				dep_it != mod.unsatisfied_depends.end(); ++dep_it)
				errorstream << " \"" << *dep_it << "\"";
			errorstream << std::endl;
		}
	}

	Settings worldmt_settings;
	std::string worldmt = m_path_world + DIR_DELIM + "world.mt";
	worldmt_settings.readConfigFile(worldmt.c_str());
	std::vector<std::string> names = worldmt_settings.getNames();
	std::set<std::string> load_mod_names;
	for(std::vector<std::string>::iterator it = names.begin();
		it != names.end(); ++it)
	{
		std::string name = *it;
		if(name.compare(0,9,"load_mod_")==0 && worldmt_settings.getBool(name))
			load_mod_names.insert(name.substr(9));
	}
	// complain about mods declared to be loaded, but not found
	for(std::vector<ModSpec>::iterator it = m_mods.begin();
			it != m_mods.end(); ++it)
		load_mod_names.erase((*it).name);
	for(std::vector<ModSpec>::iterator it = unsatisfied_mods.begin();
			it != unsatisfied_mods.end(); ++it)
		load_mod_names.erase((*it).name);
	if(!load_mod_names.empty())
	{
		errorstream << "The following mods could not be found:";
		for(std::set<std::string>::iterator it = load_mod_names.begin();
			it != load_mod_names.end(); ++it)
			errorstream << " \"" << (*it) << "\"";
		errorstream << std::endl;
	}

	// Lock environment
	JMutexAutoLock envlock(m_env_mutex);

	// Initialize scripting
	infostream<<"Server: Initializing Lua"<<std::endl;

	m_script = new GameScripting(this);

	std::string scriptpath = getBuiltinLuaPath() + DIR_DELIM "init.lua";

	if (!m_script->loadScript(scriptpath)) {
		throw ModError("Failed to load and run " + scriptpath);
	}


	// Print 'em
	infostream<<"Server: Loading mods: ";
	for(std::vector<ModSpec>::iterator i = m_mods.begin();
			i != m_mods.end(); i++){
		const ModSpec &mod = *i;
		infostream<<mod.name<<" ";
	}
	infostream<<std::endl;
	// Load and run "mod" scripts
	for(std::vector<ModSpec>::iterator i = m_mods.begin();
			i != m_mods.end(); i++){
		const ModSpec &mod = *i;
		std::string scriptpath = mod.path + DIR_DELIM + "init.lua";
		infostream<<"  ["<<padStringRight(mod.name, 12)<<"] [\""
				<<scriptpath<<"\"]"<<std::endl;
		bool success = m_script->loadMod(scriptpath, mod.name);
		if(!success){
			errorstream<<"Server: Failed to load and run "
					<<scriptpath<<std::endl;
			throw ModError("Failed to load and run "+scriptpath);
		}
	}

	// Read Textures and calculate sha1 sums
	fillMediaCache();

	// Apply item aliases in the node definition manager
	m_nodedef->updateAliases(m_itemdef);

	// Perform pending node name resolutions
	m_nodedef->getResolver()->resolveNodes();

	// Load the mapgen params from global settings now after any
	// initial overrides have been set by the mods
	m_emerge->loadMapgenParams();

	// Initialize Environment
	ServerMap *servermap = new ServerMap(path_world, this, m_emerge);
	m_env = new ServerEnvironment(servermap, m_script, this, m_path_world);

	m_clients.setEnv(m_env);

	// Run some callbacks after the MG params have been set up but before activation
	m_script->environment_OnMapgenInit(&m_emerge->params);

	// Initialize mapgens
	m_emerge->initMapgens();

	// Give environment reference to scripting api
	m_script->initializeEnvironment(m_env);

	// Register us to receive map edit events
	servermap->addEventReceiver(this);

	// If file exists, load environment metadata
	if(fs::PathExists(m_path_world + DIR_DELIM "env_meta.txt"))
	{
		infostream<<"Server: Loading environment metadata"<<std::endl;
		m_env->loadMeta();
	}

	// Add some test ActiveBlockModifiers to environment
	add_legacy_abms(m_env, m_nodedef);

	m_liquid_transform_every = g_settings->getFloat("liquid_update");
}

Server::~Server()
{
	infostream<<"Server destructing"<<std::endl;

	// Send shutdown message
	SendChatMessage(PEER_ID_INEXISTENT, L"*** Server shutting down");

	{
		JMutexAutoLock envlock(m_env_mutex);

		// Execute script shutdown hooks
		m_script->on_shutdown();

		infostream<<"Server: Saving players"<<std::endl;
		m_env->saveLoadedPlayers();

		infostream<<"Server: Saving environment metadata"<<std::endl;
		m_env->saveMeta();
	}

	// Stop threads
	stop();
	delete m_thread;

	// stop all emerge threads before deleting players that may have
	// requested blocks to be emerged
	m_emerge->stopThreads();

	// Delete things in the reverse order of creation
	delete m_env;

	// N.B. the EmergeManager should be deleted after the Environment since Map
	// depends on EmergeManager to write its current params to the map meta
	delete m_emerge;
	delete m_rollback;
	delete m_banmanager;
	delete m_event;
	delete m_itemdef;
	delete m_nodedef;
	delete m_craftdef;

	// Deinitialize scripting
	infostream<<"Server: Deinitializing scripting"<<std::endl;
	delete m_script;

	// Delete detached inventories
	for (std::map<std::string, Inventory*>::iterator
			i = m_detached_inventories.begin();
			i != m_detached_inventories.end(); i++) {
		delete i->second;
	}
}

void Server::start(Address bind_addr)
{
	DSTACK(__FUNCTION_NAME);
	infostream<<"Starting server on "
			<< bind_addr.serializeString() <<"..."<<std::endl;

	// Stop thread if already running
	m_thread->Stop();

	// Initialize connection
	m_con.SetTimeoutMs(30);
	m_con.Serve(bind_addr);

	// Start thread
	m_thread->Start();

	// ASCII art for the win!
	actionstream
	<<"        .__               __                   __   "<<std::endl
	<<"  _____ |__| ____   _____/  |_  ____   _______/  |_ "<<std::endl
	<<" /     \\|  |/    \\_/ __ \\   __\\/ __ \\ /  ___/\\   __\\"<<std::endl
	<<"|  Y Y  \\  |   |  \\  ___/|  | \\  ___/ \\___ \\  |  |  "<<std::endl
	<<"|__|_|  /__|___|  /\\___  >__|  \\___  >____  > |__|  "<<std::endl
	<<"      \\/        \\/     \\/          \\/     \\/        "<<std::endl;
	actionstream<<"World at ["<<m_path_world<<"]"<<std::endl;
	actionstream<<"Server for gameid=\""<<m_gamespec.id
			<<"\" listening on "<<bind_addr.serializeString()<<":"
			<<bind_addr.getPort() << "."<<std::endl;
}

void Server::stop()
{
	DSTACK(__FUNCTION_NAME);

	infostream<<"Server: Stopping and waiting threads"<<std::endl;

	// Stop threads (set run=false first so both start stopping)
	m_thread->Stop();
	//m_emergethread.setRun(false);
	m_thread->Wait();
	//m_emergethread.stop();

	infostream<<"Server: Threads stopped"<<std::endl;
}

void Server::step(float dtime)
{
	DSTACK(__FUNCTION_NAME);
	// Limit a bit
	if(dtime > 2.0)
		dtime = 2.0;
	{
		JMutexAutoLock lock(m_step_dtime_mutex);
		m_step_dtime += dtime;
	}
	// Throw if fatal error occurred in thread
	std::string async_err = m_async_fatal_error.get();
	if(async_err != ""){
		throw ServerError(async_err);
	}
}

void Server::AsyncRunStep(bool initial_step)
{
	DSTACK(__FUNCTION_NAME);

	g_profiler->add("Server::AsyncRunStep (num)", 1);

	float dtime;
	{
		JMutexAutoLock lock1(m_step_dtime_mutex);
		dtime = m_step_dtime;
	}

	{
		// Send blocks to clients
		SendBlocks(dtime);
	}

	if((dtime < 0.001) && (initial_step == false))
		return;

	g_profiler->add("Server::AsyncRunStep with dtime (num)", 1);

	//infostream<<"Server steps "<<dtime<<std::endl;
	//infostream<<"Server::AsyncRunStep(): dtime="<<dtime<<std::endl;

	{
		JMutexAutoLock lock1(m_step_dtime_mutex);
		m_step_dtime -= dtime;
	}

	/*
		Update uptime
	*/
	{
		m_uptime.set(m_uptime.get() + dtime);
	}

	handlePeerChanges();

	/*
		Update time of day and overall game time
	*/
	{
		JMutexAutoLock envlock(m_env_mutex);

		m_env->setTimeOfDaySpeed(g_settings->getFloat("time_speed"));

		/*
			Send to clients at constant intervals
		*/

		m_time_of_day_send_timer -= dtime;
		if(m_time_of_day_send_timer < 0.0)
		{
			m_time_of_day_send_timer = g_settings->getFloat("time_send_interval");
			u16 time = m_env->getTimeOfDay();
			float time_speed = g_settings->getFloat("time_speed");
			SendTimeOfDay(PEER_ID_INEXISTENT, time, time_speed);
		}
	}

	{
		JMutexAutoLock lock(m_env_mutex);
		// Figure out and report maximum lag to environment
		float max_lag = m_env->getMaxLagEstimate();
		max_lag *= 0.9998; // Decrease slowly (about half per 5 minutes)
		if(dtime > max_lag){
			if(dtime > 0.1 && dtime > max_lag * 2.0)
				infostream<<"Server: Maximum lag peaked to "<<dtime
						<<" s"<<std::endl;
			max_lag = dtime;
		}
		m_env->reportMaxLagEstimate(max_lag);
		// Step environment
		ScopeProfiler sp(g_profiler, "SEnv step");
		ScopeProfiler sp2(g_profiler, "SEnv step avg", SPT_AVG);
		m_env->step(dtime);
	}

	const float map_timer_and_unload_dtime = 2.92;
	if(m_map_timer_and_unload_interval.step(dtime, map_timer_and_unload_dtime))
	{
		JMutexAutoLock lock(m_env_mutex);
		// Run Map's timers and unload unused data
		ScopeProfiler sp(g_profiler, "Server: map timer and unload");
		m_env->getMap().timerUpdate(map_timer_and_unload_dtime,
				g_settings->getFloat("server_unload_unused_data_timeout"));
	}

	/*
		Do background stuff
	*/

	/*
		Handle players
	*/
	{
		JMutexAutoLock lock(m_env_mutex);

		std::list<u16> clientids = m_clients.getClientIDs();

		ScopeProfiler sp(g_profiler, "Server: handle players");

		for(std::list<u16>::iterator
			i = clientids.begin();
			i != clientids.end(); ++i)
		{
			PlayerSAO *playersao = getPlayerSAO(*i);
			if(playersao == NULL)
				continue;

			/*
				Handle player HPs (die if hp=0)
			*/
			if(playersao->m_hp_not_sent && g_settings->getBool("enable_damage"))
			{
				if(playersao->getHP() == 0)
					DiePlayer(*i);
				else
					SendPlayerHP(*i);
			}

			/*
				Send player breath if changed
			*/
			if(playersao->m_breath_not_sent) {
				SendPlayerBreath(*i);
			}

			/*
				Send player inventories if necessary
			*/
			if(playersao->m_moved){
				SendMovePlayer(*i);
				playersao->m_moved = false;
			}
			if(playersao->m_inventory_not_sent){
				UpdateCrafting(*i);
				SendInventory(*i);
			}
		}
	}

	/* Transform liquids */
	m_liquid_transform_timer += dtime;
	if(m_liquid_transform_timer >= m_liquid_transform_every)
	{
		m_liquid_transform_timer -= m_liquid_transform_every;

		JMutexAutoLock lock(m_env_mutex);

		ScopeProfiler sp(g_profiler, "Server: liquid transform");

		std::map<v3s16, MapBlock*> modified_blocks;
		m_env->getMap().transformLiquids(modified_blocks);
#if 0
		/*
			Update lighting
		*/
		core::map<v3s16, MapBlock*> lighting_modified_blocks;
		ServerMap &map = ((ServerMap&)m_env->getMap());
		map.updateLighting(modified_blocks, lighting_modified_blocks);

		// Add blocks modified by lighting to modified_blocks
		for(core::map<v3s16, MapBlock*>::Iterator
				i = lighting_modified_blocks.getIterator();
				i.atEnd() == false; i++)
		{
			MapBlock *block = i.getNode()->getValue();
			modified_blocks.insert(block->getPos(), block);
		}
#endif
		/*
			Set the modified blocks unsent for all the clients
		*/
		if(modified_blocks.size() > 0)
		{
			SetBlocksNotSent(modified_blocks);
		}
	}
	m_clients.step(dtime);

	m_lag += (m_lag > dtime ? -1 : 1) * dtime/100;
#if USE_CURL
	// send masterserver announce
	{
		float &counter = m_masterserver_timer;
		if(!isSingleplayer() && (!counter || counter >= 300.0) &&
				g_settings->getBool("server_announce"))
		{
			ServerList::sendAnnounce(counter ? "update" : "start",
					m_clients.getPlayerNames(),
					m_uptime.get(),
					m_env->getGameTime(),
					m_lag,
					m_gamespec.id,
					m_emerge->params.mg_name,
					m_mods);
			counter = 0.01;
		}
		counter += dtime;
	}
#endif

	/*
		Check added and deleted active objects
	*/
	{
		//infostream<<"Server: Checking added and deleted active objects"<<std::endl;
		JMutexAutoLock envlock(m_env_mutex);

		m_clients.Lock();
		std::map<u16, RemoteClient*> clients = m_clients.getClientList();
		ScopeProfiler sp(g_profiler, "Server: checking added and deleted objs");

		// Radius inside which objects are active
		s16 radius = g_settings->getS16("active_object_send_range_blocks");
		s16 player_radius = g_settings->getS16("player_transfer_distance");

		if (player_radius == 0 && g_settings->exists("unlimited_player_transfer_distance") &&
				!g_settings->getBool("unlimited_player_transfer_distance"))
			player_radius = radius;

		radius *= MAP_BLOCKSIZE;
		player_radius *= MAP_BLOCKSIZE;

		for(std::map<u16, RemoteClient*>::iterator
			i = clients.begin();
			i != clients.end(); ++i)
		{
			RemoteClient *client = i->second;

			// If definitions and textures have not been sent, don't
			// send objects either
			if (client->getState() < CS_DefinitionsSent)
				continue;

			Player *player = m_env->getPlayer(client->peer_id);
			if(player==NULL)
			{
				// This can happen if the client timeouts somehow
				/*infostream<<"WARNING: "<<__FUNCTION_NAME<<": Client "
						<<client->peer_id
						<<" has no associated player"<<std::endl;*/
				continue;
			}
			v3s16 pos = floatToInt(player->getPosition(), BS);

			std::set<u16> removed_objects;
			std::set<u16> added_objects;
			m_env->getRemovedActiveObjects(pos, radius, player_radius,
					client->m_known_objects, removed_objects);
			m_env->getAddedActiveObjects(pos, radius, player_radius,
					client->m_known_objects, added_objects);

			// Ignore if nothing happened
			if(removed_objects.size() == 0 && added_objects.size() == 0)
			{
				//infostream<<"active objects: none changed"<<std::endl;
				continue;
			}

			std::string data_buffer;

			char buf[4];

			// Handle removed objects
			writeU16((u8*)buf, removed_objects.size());
			data_buffer.append(buf, 2);
			for(std::set<u16>::iterator
					i = removed_objects.begin();
					i != removed_objects.end(); ++i)
			{
				// Get object
				u16 id = *i;
				ServerActiveObject* obj = m_env->getActiveObject(id);

				// Add to data buffer for sending
				writeU16((u8*)buf, id);
				data_buffer.append(buf, 2);

				// Remove from known objects
				client->m_known_objects.erase(id);

				if(obj && obj->m_known_by_count > 0)
					obj->m_known_by_count--;
			}

			// Handle added objects
			writeU16((u8*)buf, added_objects.size());
			data_buffer.append(buf, 2);
			for(std::set<u16>::iterator
					i = added_objects.begin();
					i != added_objects.end(); ++i)
			{
				// Get object
				u16 id = *i;
				ServerActiveObject* obj = m_env->getActiveObject(id);

				// Get object type
				u8 type = ACTIVEOBJECT_TYPE_INVALID;
				if(obj == NULL)
					infostream<<"WARNING: "<<__FUNCTION_NAME
							<<": NULL object"<<std::endl;
				else
					type = obj->getSendType();

				// Add to data buffer for sending
				writeU16((u8*)buf, id);
				data_buffer.append(buf, 2);
				writeU8((u8*)buf, type);
				data_buffer.append(buf, 1);

				if(obj)
					data_buffer.append(serializeLongString(
							obj->getClientInitializationData(client->net_proto_version)));
				else
					data_buffer.append(serializeLongString(""));

				// Add to known objects
				client->m_known_objects.insert(id);

				if(obj)
					obj->m_known_by_count++;
			}

			// Send packet
			SharedBuffer<u8> reply(2 + data_buffer.size());
			writeU16(&reply[0], TOCLIENT_ACTIVE_OBJECT_REMOVE_ADD);
			memcpy((char*)&reply[2], data_buffer.c_str(),
					data_buffer.size());
			// Send as reliable
			m_clients.send(client->peer_id, 0, reply, true);

			verbosestream<<"Server: Sent object remove/add: "
					<<removed_objects.size()<<" removed, "
					<<added_objects.size()<<" added, "
					<<"packet size is "<<reply.getSize()<<std::endl;
		}
		m_clients.Unlock();
#if 0
		/*
			Collect a list of all the objects known by the clients
			and report it back to the environment.
		*/

		core::map<u16, bool> all_known_objects;

		for(core::map<u16, RemoteClient*>::Iterator
			i = m_clients.getIterator();
			i.atEnd() == false; i++)
		{
			RemoteClient *client = i.getNode()->getValue();
			// Go through all known objects of client
			for(core::map<u16, bool>::Iterator
					i = client->m_known_objects.getIterator();
					i.atEnd()==false; i++)
			{
				u16 id = i.getNode()->getKey();
				all_known_objects[id] = true;
			}
		}

		m_env->setKnownActiveObjects(whatever);
#endif

	}

	/*
		Send object messages
	*/
	{
		JMutexAutoLock envlock(m_env_mutex);
		ScopeProfiler sp(g_profiler, "Server: sending object messages");

		// Key = object id
		// Value = data sent by object
		std::map<u16, std::list<ActiveObjectMessage>* > buffered_messages;

		// Get active object messages from environment
		for(;;)
		{
			ActiveObjectMessage aom = m_env->getActiveObjectMessage();
			if(aom.id == 0)
				break;

			std::list<ActiveObjectMessage>* message_list = NULL;
			std::map<u16, std::list<ActiveObjectMessage>* >::iterator n;
			n = buffered_messages.find(aom.id);
			if(n == buffered_messages.end())
			{
				message_list = new std::list<ActiveObjectMessage>;
				buffered_messages[aom.id] = message_list;
			}
			else
			{
				message_list = n->second;
			}
			message_list->push_back(aom);
		}

		m_clients.Lock();
		std::map<u16, RemoteClient*> clients = m_clients.getClientList();
		// Route data to every client
		for(std::map<u16, RemoteClient*>::iterator
			i = clients.begin();
			i != clients.end(); ++i)
		{
			RemoteClient *client = i->second;
			std::string reliable_data;
			std::string unreliable_data;
			// Go through all objects in message buffer
			for(std::map<u16, std::list<ActiveObjectMessage>* >::iterator
					j = buffered_messages.begin();
					j != buffered_messages.end(); ++j)
			{
				// If object is not known by client, skip it
				u16 id = j->first;
				if(client->m_known_objects.find(id) == client->m_known_objects.end())
					continue;
				// Get message list of object
				std::list<ActiveObjectMessage>* list = j->second;
				// Go through every message
				for(std::list<ActiveObjectMessage>::iterator
						k = list->begin(); k != list->end(); ++k)
				{
					// Compose the full new data with header
					ActiveObjectMessage aom = *k;
					std::string new_data;
					// Add object id
					char buf[2];
					writeU16((u8*)&buf[0], aom.id);
					new_data.append(buf, 2);
					// Add data
					new_data += serializeString(aom.datastring);
					// Add data to buffer
					if(aom.reliable)
						reliable_data += new_data;
					else
						unreliable_data += new_data;
				}
			}
			/*
				reliable_data and unreliable_data are now ready.
				Send them.
			*/
			if(reliable_data.size() > 0)
			{
				SharedBuffer<u8> reply(2 + reliable_data.size());
				writeU16(&reply[0], TOCLIENT_ACTIVE_OBJECT_MESSAGES);
				memcpy((char*)&reply[2], reliable_data.c_str(),
						reliable_data.size());
				// Send as reliable
				m_clients.send(client->peer_id, 0, reply, true);
			}
			if(unreliable_data.size() > 0)
			{
				SharedBuffer<u8> reply(2 + unreliable_data.size());
				writeU16(&reply[0], TOCLIENT_ACTIVE_OBJECT_MESSAGES);
				memcpy((char*)&reply[2], unreliable_data.c_str(),
						unreliable_data.size());
				// Send as unreliable
				m_clients.send(client->peer_id, 1, reply, false);
			}

			/*if(reliable_data.size() > 0 || unreliable_data.size() > 0)
			{
				infostream<<"Server: Size of object message data: "
						<<"reliable: "<<reliable_data.size()
						<<", unreliable: "<<unreliable_data.size()
						<<std::endl;
			}*/
		}
		m_clients.Unlock();

		// Clear buffered_messages
		for(std::map<u16, std::list<ActiveObjectMessage>* >::iterator
				i = buffered_messages.begin();
				i != buffered_messages.end(); ++i)
		{
			delete i->second;
		}
	}

	/*
		Send queued-for-sending map edit events.
	*/
	{
		// We will be accessing the environment
		JMutexAutoLock lock(m_env_mutex);

		// Don't send too many at a time
		//u32 count = 0;

		// Single change sending is disabled if queue size is not small
		bool disable_single_change_sending = false;
		if(m_unsent_map_edit_queue.size() >= 4)
			disable_single_change_sending = true;

		int event_count = m_unsent_map_edit_queue.size();

		// We'll log the amount of each
		Profiler prof;

		while(m_unsent_map_edit_queue.size() != 0)
		{
			MapEditEvent* event = m_unsent_map_edit_queue.pop_front();

			// Players far away from the change are stored here.
			// Instead of sending the changes, MapBlocks are set not sent
			// for them.
			std::list<u16> far_players;

			if(event->type == MEET_ADDNODE || event->type == MEET_SWAPNODE)
			{
				//infostream<<"Server: MEET_ADDNODE"<<std::endl;
				prof.add("MEET_ADDNODE", 1);
				if(disable_single_change_sending)
					sendAddNode(event->p, event->n, event->already_known_by_peer,
							&far_players, 5, event->type == MEET_ADDNODE);
				else
					sendAddNode(event->p, event->n, event->already_known_by_peer,
							&far_players, 30, event->type == MEET_ADDNODE);
			}
			else if(event->type == MEET_REMOVENODE)
			{
				//infostream<<"Server: MEET_REMOVENODE"<<std::endl;
				prof.add("MEET_REMOVENODE", 1);
				if(disable_single_change_sending)
					sendRemoveNode(event->p, event->already_known_by_peer,
							&far_players, 5);
				else
					sendRemoveNode(event->p, event->already_known_by_peer,
							&far_players, 30);
			}
			else if(event->type == MEET_BLOCK_NODE_METADATA_CHANGED)
			{
				infostream<<"Server: MEET_BLOCK_NODE_METADATA_CHANGED"<<std::endl;
				prof.add("MEET_BLOCK_NODE_METADATA_CHANGED", 1);
				setBlockNotSent(event->p);
			}
			else if(event->type == MEET_OTHER)
			{
				infostream<<"Server: MEET_OTHER"<<std::endl;
				prof.add("MEET_OTHER", 1);
				for(std::set<v3s16>::iterator
						i = event->modified_blocks.begin();
						i != event->modified_blocks.end(); ++i)
				{
					setBlockNotSent(*i);
				}
			}
			else
			{
				prof.add("unknown", 1);
				infostream<<"WARNING: Server: Unknown MapEditEvent "
						<<((u32)event->type)<<std::endl;
			}

			/*
				Set blocks not sent to far players
			*/
			if(far_players.size() > 0)
			{
				// Convert list format to that wanted by SetBlocksNotSent
				std::map<v3s16, MapBlock*> modified_blocks2;
				for(std::set<v3s16>::iterator
						i = event->modified_blocks.begin();
						i != event->modified_blocks.end(); ++i)
				{
					modified_blocks2[*i] =
							m_env->getMap().getBlockNoCreateNoEx(*i);
				}
				// Set blocks not sent
				for(std::list<u16>::iterator
						i = far_players.begin();
						i != far_players.end(); ++i)
				{
					u16 peer_id = *i;
					RemoteClient *client = getClient(peer_id);
					if(client==NULL)
						continue;
					client->SetBlocksNotSent(modified_blocks2);
				}
			}

			delete event;

			/*// Don't send too many at a time
			count++;
			if(count >= 1 && m_unsent_map_edit_queue.size() < 100)
				break;*/
		}

		if(event_count >= 5){
			infostream<<"Server: MapEditEvents:"<<std::endl;
			prof.print(infostream);
		} else if(event_count != 0){
			verbosestream<<"Server: MapEditEvents:"<<std::endl;
			prof.print(verbosestream);
		}

	}

	/*
		Trigger emergethread (it somehow gets to a non-triggered but
		bysy state sometimes)
	*/
	{
		float &counter = m_emergethread_trigger_timer;
		counter += dtime;
		if(counter >= 2.0)
		{
			counter = 0.0;

			m_emerge->startThreads();

			// Update m_enable_rollback_recording here too
			m_enable_rollback_recording =
					g_settings->getBool("enable_rollback_recording");
		}
	}

	// Save map, players and auth stuff
	{
		float &counter = m_savemap_timer;
		counter += dtime;
		if(counter >= g_settings->getFloat("server_map_save_interval"))
		{
			counter = 0.0;
			JMutexAutoLock lock(m_env_mutex);

			ScopeProfiler sp(g_profiler, "Server: saving stuff");

			// Save ban file
			if (m_banmanager->isModified()) {
				m_banmanager->save();
			}

			// Save changed parts of map
			m_env->getMap().save(MOD_STATE_WRITE_NEEDED);

			// Save players
			m_env->saveLoadedPlayers();

			// Save environment metadata
			m_env->saveMeta();
		}
	}
}

void Server::Receive()
{
	DSTACK(__FUNCTION_NAME);
	SharedBuffer<u8> data;
	u16 peer_id;
	u32 datasize;
	try{
		datasize = m_con.Receive(peer_id,data);
		ProcessData(*data, datasize, peer_id);
	}
	catch(con::InvalidIncomingDataException &e)
	{
		infostream<<"Server::Receive(): "
				"InvalidIncomingDataException: what()="
				<<e.what()<<std::endl;
	}
	catch(SerializationError &e) {
		infostream<<"Server::Receive(): "
				"SerializationError: what()="
				<<e.what()<<std::endl;
	}
	catch(ClientStateError &e)
	{
		errorstream << "ProcessData: peer=" << peer_id  << e.what() << std::endl;
		DenyAccess(peer_id, L"Your client sent something server didn't expect."
				L"Try reconnecting or updating your client");
	}
	catch(con::PeerNotFoundException &e)
	{
		// Do nothing
	}
}

PlayerSAO* Server::StageTwoClientInit(u16 peer_id)
{
	std::string playername = "";
	PlayerSAO *playersao = NULL;
	m_clients.Lock();
	try {
		RemoteClient* client = m_clients.lockedGetClientNoEx(peer_id, CS_InitDone);
		if (client != NULL) {
			playername = client->getName();
			playersao = emergePlayer(playername.c_str(), peer_id);
		}
	} catch (std::exception &e) {
		m_clients.Unlock();
		throw;
	}
	m_clients.Unlock();

	RemotePlayer *player =
		static_cast<RemotePlayer*>(m_env->getPlayer(playername.c_str()));

	// If failed, cancel
	if((playersao == NULL) || (player == NULL))
	{
		if(player && player->peer_id != 0){
			errorstream<<"Server: "<<playername<<": Failed to emerge player"
					<<" (player allocated to an another client)"<<std::endl;
			DenyAccess(peer_id, L"Another client is connected with this "
					L"name. If your client closed unexpectedly, try again in "
					L"a minute.");
		} else {
			errorstream<<"Server: "<<playername<<": Failed to emerge player"
					<<std::endl;
			DenyAccess(peer_id, L"Could not allocate player.");
		}
		return NULL;
	}

	/*
		Send complete position information
	*/
	SendMovePlayer(peer_id);

	// Send privileges
	SendPlayerPrivileges(peer_id);

	// Send inventory formspec
	SendPlayerInventoryFormspec(peer_id);

	// Send inventory
	UpdateCrafting(peer_id);
	SendInventory(peer_id);

	// Send HP
	if(g_settings->getBool("enable_damage"))
		SendPlayerHP(peer_id);

	// Send Breath
	SendPlayerBreath(peer_id);

	// Show death screen if necessary
	if(player->hp == 0)
		SendDeathscreen(peer_id, false, v3f(0,0,0));

	// Note things in chat if not in simple singleplayer mode
	if(!m_simple_singleplayer_mode)
	{
		// Send information about server to player in chat
		SendChatMessage(peer_id, getStatusString());

		// Send information about joining in chat
		{
			std::wstring name = L"unknown";
			Player *player = m_env->getPlayer(peer_id);
			if(player != NULL)
				name = narrow_to_wide(player->getName());

			std::wstring message;
			message += L"*** ";
			message += name;
			message += L" joined the game.";
			SendChatMessage(PEER_ID_INEXISTENT,message);
		}
	}
	Address addr = getPeerAddress(player->peer_id);
	std::string ip_str = addr.serializeString();
	actionstream<<player->getName() <<" [" << ip_str << "] joins game. " << std::endl;
	/*
		Print out action
	*/
	{
		std::vector<std::string> names = m_clients.getPlayerNames();

		actionstream<<player->getName() <<" joins game. List of players: ";

		for (std::vector<std::string>::iterator i = names.begin();
				i != names.end(); i++)
		{
			actionstream << *i << " ";
		}

		actionstream << player->getName() <<std::endl;
	}
	return playersao;
}

void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	// Environment is locked first.
	JMutexAutoLock envlock(m_env_mutex);

	ScopeProfiler sp(g_profiler, "Server::ProcessData");

	std::string addr_s;
	try{
		Address address = getPeerAddress(peer_id);
		addr_s = address.serializeString();

		// drop player if is ip is banned
		if(m_banmanager->isIpBanned(addr_s)){
			std::string ban_name = m_banmanager->getBanName(addr_s);
			infostream<<"Server: A banned client tried to connect from "
					<<addr_s<<"; banned name was "
					<<ban_name<<std::endl;
			// This actually doesn't seem to transfer to the client
			DenyAccess(peer_id, L"Your ip is banned. Banned name was "
					+narrow_to_wide(ban_name));
			return;
		}
	}
	catch(con::PeerNotFoundException &e)
	{
		/*
		 * no peer for this packet found
		 * most common reason is peer timeout, e.g. peer didn't
		 * respond for some time, your server was overloaded or
		 * things like that.
		 */
		infostream<<"Server::ProcessData(): Cancelling: peer "
				<<peer_id<<" not found"<<std::endl;
		return;
	}

	try
	{

	if(datasize < 2)
		return;

	ToServerCommand command = (ToServerCommand)readU16(&data[0]);

	if(command == TOSERVER_INIT)
	{
		// [0] u16 TOSERVER_INIT
		// [2] u8 SER_FMT_VER_HIGHEST_READ
		// [3] u8[20] player_name
		// [23] u8[28] password <--- can be sent without this, from old versions

		if(datasize < 2+1+PLAYERNAME_SIZE)
			return;

		RemoteClient* client = getClient(peer_id, CS_Created);

		// If net_proto_version is set, this client has already been handled
		if(client->getState() > CS_Created)
		{
			verbosestream<<"Server: Ignoring multiple TOSERVER_INITs from "
					<<addr_s<<" (peer_id="<<peer_id<<")"<<std::endl;
			return;
		}

		verbosestream<<"Server: Got TOSERVER_INIT from "<<addr_s<<" (peer_id="
				<<peer_id<<")"<<std::endl;

		// Do not allow multiple players in simple singleplayer mode.
		// This isn't a perfect way to do it, but will suffice for now
		if(m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1){
			infostream<<"Server: Not allowing another client ("<<addr_s
					<<") to connect in simple singleplayer mode"<<std::endl;
			DenyAccess(peer_id, L"Running in simple singleplayer mode.");
			return;
		}

		// First byte after command is maximum supported
		// serialization version
		u8 client_max = data[2];
		u8 our_max = SER_FMT_VER_HIGHEST_READ;
		// Use the highest version supported by both
		u8 deployed = std::min(client_max, our_max);
		// If it's lower than the lowest supported, give up.
		if(deployed < SER_FMT_VER_LOWEST)
			deployed = SER_FMT_VER_INVALID;

		if(deployed == SER_FMT_VER_INVALID)
		{
			actionstream<<"Server: A mismatched client tried to connect from "
					<<addr_s<<std::endl;
			infostream<<"Server: Cannot negotiate serialization version with "
					<<addr_s<<std::endl;
			DenyAccess(peer_id, std::wstring(
					L"Your client's version is not supported.\n"
					L"Server version is ")
					+ narrow_to_wide(minetest_version_simple) + L"."
			);
			return;
		}

		client->setPendingSerializationVersion(deployed);

		/*
			Read and check network protocol version
		*/

		u16 min_net_proto_version = 0;
		if(datasize >= 2+1+PLAYERNAME_SIZE+PASSWORD_SIZE+2)
			min_net_proto_version = readU16(&data[2+1+PLAYERNAME_SIZE+PASSWORD_SIZE]);

		// Use same version as minimum and maximum if maximum version field
		// doesn't exist (backwards compatibility)
		u16 max_net_proto_version = min_net_proto_version;
		if(datasize >= 2+1+PLAYERNAME_SIZE+PASSWORD_SIZE+2+2)
			max_net_proto_version = readU16(&data[2+1+PLAYERNAME_SIZE+PASSWORD_SIZE+2]);

		// Start with client's maximum version
		u16 net_proto_version = max_net_proto_version;

		// Figure out a working version if it is possible at all
		if(max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
				min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX)
		{
			// If maximum is larger than our maximum, go with our maximum
			if(max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
				net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
			// Else go with client's maximum
			else
				net_proto_version = max_net_proto_version;
		}

		verbosestream<<"Server: "<<addr_s<<": Protocol version: min: "
				<<min_net_proto_version<<", max: "<<max_net_proto_version
				<<", chosen: "<<net_proto_version<<std::endl;

		client->net_proto_version = net_proto_version;

		if(net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
				net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
		{
			actionstream<<"Server: A mismatched client tried to connect from "
					<<addr_s<<std::endl;
			DenyAccess(peer_id, std::wstring(
					L"Your client's version is not supported.\n"
					L"Server version is ")
					+ narrow_to_wide(minetest_version_simple) + L",\n"
					+ L"server's PROTOCOL_VERSION is "
					+ narrow_to_wide(itos(SERVER_PROTOCOL_VERSION_MIN))
					+ L"..."
					+ narrow_to_wide(itos(SERVER_PROTOCOL_VERSION_MAX))
					+ L", client's PROTOCOL_VERSION is "
					+ narrow_to_wide(itos(min_net_proto_version))
					+ L"..."
					+ narrow_to_wide(itos(max_net_proto_version))
			);
			return;
		}

		if(g_settings->getBool("strict_protocol_version_checking"))
		{
			if(net_proto_version != LATEST_PROTOCOL_VERSION)
			{
				actionstream<<"Server: A mismatched (strict) client tried to "
						<<"connect from "<<addr_s<<std::endl;
				DenyAccess(peer_id, std::wstring(
						L"Your client's version is not supported.\n"
						L"Server version is ")
						+ narrow_to_wide(minetest_version_simple) + L",\n"
						+ L"server's PROTOCOL_VERSION (strict) is "
						+ narrow_to_wide(itos(LATEST_PROTOCOL_VERSION))
						+ L", client's PROTOCOL_VERSION is "
						+ narrow_to_wide(itos(min_net_proto_version))
						+ L"..."
						+ narrow_to_wide(itos(max_net_proto_version))
				);
				return;
			}
		}

		/*
			Set up player
		*/
		char playername[PLAYERNAME_SIZE];
		unsigned int playername_length = 0;
		for (; playername_length < PLAYERNAME_SIZE; playername_length++ ) {
			playername[playername_length] = data[3+playername_length];
			if (data[3+playername_length] == 0)
				break;
		}

		if (playername_length == PLAYERNAME_SIZE) {
			actionstream<<"Server: Player with name exceeding max length "
					<<"tried to connect from "<<addr_s<<std::endl;
			DenyAccess(peer_id, L"Name too long");
			return;
		}


		if(playername[0]=='\0')
		{
			actionstream<<"Server: Player with an empty name "
					<<"tried to connect from "<<addr_s<<std::endl;
			DenyAccess(peer_id, L"Empty name");
			return;
		}

		if(string_allowed(playername, PLAYERNAME_ALLOWED_CHARS)==false)
		{
			actionstream<<"Server: Player with an invalid name "
					<<"tried to connect from "<<addr_s<<std::endl;
			DenyAccess(peer_id, L"Name contains unallowed characters");
			return;
		}

		if(!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0)
		{
			actionstream<<"Server: Player with the name \"singleplayer\" "
					<<"tried to connect from "<<addr_s<<std::endl;
			DenyAccess(peer_id, L"Name is not allowed");
			return;
		}

		{
			std::string reason;
			if(m_script->on_prejoinplayer(playername, addr_s, reason))
			{
				actionstream<<"Server: Player with the name \""<<playername<<"\" "
						<<"tried to connect from "<<addr_s<<" "
						<<"but it was disallowed for the following reason: "
						<<reason<<std::endl;
				DenyAccess(peer_id, narrow_to_wide(reason.c_str()));
				return;
			}
		}

		infostream<<"Server: New connection: \""<<playername<<"\" from "
				<<addr_s<<" (peer_id="<<peer_id<<")"<<std::endl;

		// Get password
		char given_password[PASSWORD_SIZE];
		if(datasize < 2+1+PLAYERNAME_SIZE+PASSWORD_SIZE)
		{
			// old version - assume blank password
			given_password[0] = 0;
		}
		else
		{
			for(u32 i=0; i<PASSWORD_SIZE-1; i++)
			{
				given_password[i] = data[23+i];
			}
			given_password[PASSWORD_SIZE-1] = 0;
		}

		if(!base64_is_valid(given_password)){
			actionstream<<"Server: "<<playername
					<<" supplied invalid password hash"<<std::endl;
			DenyAccess(peer_id, L"Invalid password hash");
			return;
		}

		// Enforce user limit.
		// Don't enforce for users that have some admin right
		if(m_clients.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") &&
				!checkPriv(playername, "server") &&
				!checkPriv(playername, "ban") &&
				!checkPriv(playername, "privs") &&
				!checkPriv(playername, "password") &&
				playername != g_settings->get("name"))
		{
			actionstream<<"Server: "<<playername<<" tried to join, but there"
					<<" are already max_users="
					<<g_settings->getU16("max_users")<<" players."<<std::endl;
			DenyAccess(peer_id, L"Too many users.");
			return;
		}

		std::string checkpwd; // Password hash to check against
		bool has_auth = m_script->getAuth(playername, &checkpwd, NULL);

		// If no authentication info exists for user, create it
		if(!has_auth){
			if(!isSingleplayer() &&
					g_settings->getBool("disallow_empty_password") &&
					std::string(given_password) == ""){
				actionstream<<"Server: "<<playername
						<<" supplied empty password"<<std::endl;
				DenyAccess(peer_id, L"Empty passwords are "
						L"disallowed. Set a password and try again.");
				return;
			}
			std::wstring raw_default_password =
				narrow_to_wide(g_settings->get("default_password"));
			std::string initial_password =
				translatePassword(playername, raw_default_password);

			// If default_password is empty, allow any initial password
			if (raw_default_password.length() == 0)
				initial_password = given_password;

			m_script->createAuth(playername, initial_password);
		}

		has_auth = m_script->getAuth(playername, &checkpwd, NULL);

		if(!has_auth){
			actionstream<<"Server: "<<playername<<" cannot be authenticated"
					<<" (auth handler does not work?)"<<std::endl;
			DenyAccess(peer_id, L"Not allowed to login");
			return;
		}

		if(given_password != checkpwd){
			actionstream<<"Server: "<<playername<<" supplied wrong password"
					<<std::endl;
			DenyAccess(peer_id, L"Wrong password");
			return;
		}

		RemotePlayer *player =
				static_cast<RemotePlayer*>(m_env->getPlayer(playername));

		if(player && player->peer_id != 0){
			errorstream<<"Server: "<<playername<<": Failed to emerge player"
					<<" (player allocated to an another client)"<<std::endl;
			DenyAccess(peer_id, L"Another client is connected with this "
					L"name. If your client closed unexpectedly, try again in "
					L"a minute.");
		}

		m_clients.setPlayerName(peer_id,playername);

		/*
			Answer with a TOCLIENT_INIT
		*/
		{
			SharedBuffer<u8> reply(2+1+6+8+4);
			writeU16(&reply[0], TOCLIENT_INIT);
			writeU8(&reply[2], deployed);
			//send dummy pos for legacy reasons only
			writeV3S16(&reply[2+1], floatToInt(v3f(0,0,0), BS));
			writeU64(&reply[2+1+6], m_env->getServerMap().getSeed());
			writeF1000(&reply[2+1+6+8], g_settings->getFloat("dedicated_server_step"));

			// Send as reliable
			m_clients.send(peer_id, 0, reply, true);
			m_clients.event(peer_id, CSE_Init);
		}

		return;
	}

	if(command == TOSERVER_INIT2)
	{

		verbosestream<<"Server: Got TOSERVER_INIT2 from "
				<<peer_id<<std::endl;

		m_clients.event(peer_id, CSE_GotInit2);
		u16 protocol_version = m_clients.getProtocolVersion(peer_id);


		///// begin compatibility code
		PlayerSAO* playersao = NULL;
		if (protocol_version <= 22) {
			playersao = StageTwoClientInit(peer_id);

			if (playersao == NULL) {
				errorstream
					<< "TOSERVER_INIT2 stage 2 client init failed for peer "
					<< peer_id << std::endl;
				return;
			}
		}
		///// end compatibility code

		/*
			Send some initialization data
		*/

		infostream<<"Server: Sending content to "
				<<getPlayerName(peer_id)<<std::endl;

		// Send player movement settings
		SendMovement(peer_id);

		// Send item definitions
		SendItemDef(peer_id, m_itemdef, protocol_version);

		// Send node definitions
		SendNodeDef(peer_id, m_nodedef, protocol_version);

		m_clients.event(peer_id, CSE_SetDefinitionsSent);

		// Send media announcement
		sendMediaAnnouncement(peer_id);

		// Send detached inventories
		sendDetachedInventories(peer_id);

		// Send time of day
		u16 time = m_env->getTimeOfDay();
		float time_speed = g_settings->getFloat("time_speed");
		SendTimeOfDay(peer_id, time, time_speed);

		///// begin compatibility code
		if (protocol_version <= 22) {
			m_clients.event(peer_id, CSE_SetClientReady);
			m_script->on_joinplayer(playersao);
		}
		///// end compatibility code

		// Warnings about protocol version can be issued here
		if(getClient(peer_id)->net_proto_version < LATEST_PROTOCOL_VERSION)
		{
			SendChatMessage(peer_id, L"# Server: WARNING: YOUR CLIENT'S "
					L"VERSION MAY NOT BE FULLY COMPATIBLE WITH THIS SERVER!");
		}

		return;
	}

	u8 peer_ser_ver = getClient(peer_id, CS_InitDone)->serialization_version;
	u16 peer_proto_ver = getClient(peer_id, CS_InitDone)->net_proto_version;

	if(peer_ser_ver == SER_FMT_VER_INVALID)
	{
		errorstream<<"Server::ProcessData(): Cancelling: Peer"
				" serialization format invalid or not initialized."
				" Skipping incoming command="<<command<<std::endl;
		return;
	}

	/* Handle commands relate to client startup */
	if(command == TOSERVER_REQUEST_MEDIA) {
		std::string datastring((char*)&data[2], datasize-2);
		std::istringstream is(datastring, std::ios_base::binary);

		std::list<std::string> tosend;
		u16 numfiles = readU16(is);

		infostream<<"Sending "<<numfiles<<" files to "
				<<getPlayerName(peer_id)<<std::endl;
		verbosestream<<"TOSERVER_REQUEST_MEDIA: "<<std::endl;

		for(int i = 0; i < numfiles; i++) {
			std::string name = deSerializeString(is);
			tosend.push_back(name);
			verbosestream<<"TOSERVER_REQUEST_MEDIA: requested file "
					<<name<<std::endl;
		}

		sendRequestedMedia(peer_id, tosend);
		return;
	}
	else if(command == TOSERVER_RECEIVED_MEDIA) {
		return;
	}
	else if(command == TOSERVER_CLIENT_READY) {
		// clients <= protocol version 22 did not send ready message,
		// they're already initialized
		if (peer_proto_ver <= 22) {
			infostream << "Client sent message not expected by a "
				<< "client using protocol version <= 22,"
				<< "disconnecing peer_id: " << peer_id << std::endl;
			m_con.DisconnectPeer(peer_id);
			return;
		}

		PlayerSAO* playersao = StageTwoClientInit(peer_id);

		if (playersao == NULL) {
			errorstream
				<< "TOSERVER_CLIENT_READY stage 2 client init failed for peer_id: "
				<< peer_id << std::endl;
			m_con.DisconnectPeer(peer_id);
			return;
		}


		if(datasize < 2+8) {
			errorstream
				<< "TOSERVER_CLIENT_READY client sent inconsistent data, disconnecting peer_id: "
				<< peer_id << std::endl;
			m_con.DisconnectPeer(peer_id);
			return;
		}

		m_clients.setClientVersion(
				peer_id,
				data[2], data[3], data[4],
				std::string((char*) &data[8],(u16) data[6]));

		m_clients.event(peer_id, CSE_SetClientReady);
		m_script->on_joinplayer(playersao);

	}
	else if(command == TOSERVER_GOTBLOCKS)
	{
		if(datasize < 2+1)
			return;

		/*
			[0] u16 command
			[2] u8 count
			[3] v3s16 pos_0
			[3+6] v3s16 pos_1
			...
		*/

		u16 count = data[2];
		for(u16 i=0; i<count; i++)
		{
			if((s16)datasize < 2+1+(i+1)*6)
				throw con::InvalidIncomingDataException
					("GOTBLOCKS length is too short");
			v3s16 p = readV3S16(&data[2+1+i*6]);
			/*infostream<<"Server: GOTBLOCKS ("
					<<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
			RemoteClient *client = getClient(peer_id);
			client->GotBlock(p);
		}
		return;
	}

	if (m_clients.getClientState(peer_id) < CS_Active)
	{
		if (command == TOSERVER_PLAYERPOS) return;

		errorstream<<"Got packet command: " << command << " for peer id "
				<< peer_id << " but client isn't active yet. Dropping packet "
				<<std::endl;
		return;
	}

	Player *player = m_env->getPlayer(peer_id);
	if(player == NULL) {
		errorstream<<"Server::ProcessData(): Cancelling: "
				"No player for peer_id="<<peer_id
				<< " disconnecting peer!" <<std::endl;
		m_con.DisconnectPeer(peer_id);
		return;
	}

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

	if(command == TOSERVER_PLAYERPOS)
	{
		if(datasize < 2+12+12+4+4)
			return;

		u32 start = 0;
		v3s32 ps = readV3S32(&data[start+2]);
		v3s32 ss = readV3S32(&data[start+2+12]);
		f32 pitch = (f32)readS32(&data[2+12+12]) / 100.0;
		f32 yaw = (f32)readS32(&data[2+12+12+4]) / 100.0;
		u32 keyPressed = 0;
		if(datasize >= 2+12+12+4+4+4)
			keyPressed = (u32)readU32(&data[2+12+12+4+4]);
		v3f position((f32)ps.X/100., (f32)ps.Y/100., (f32)ps.Z/100.);
		v3f speed((f32)ss.X/100., (f32)ss.Y/100., (f32)ss.Z/100.);
		pitch = wrapDegrees(pitch);
		yaw = wrapDegrees(yaw);

		player->setPosition(position);
		player->setSpeed(speed);
		player->setPitch(pitch);
		player->setYaw(yaw);
		player->keyPressed=keyPressed;
		player->control.up = (bool)(keyPressed&1);
		player->control.down = (bool)(keyPressed&2);
		player->control.left = (bool)(keyPressed&4);
		player->control.right = (bool)(keyPressed&8);
		player->control.jump = (bool)(keyPressed&16);
		player->control.aux1 = (bool)(keyPressed&32);
		player->control.sneak = (bool)(keyPressed&64);
		player->control.LMB = (bool)(keyPressed&128);
		player->control.RMB = (bool)(keyPressed&256);

		bool cheated = playersao->checkMovementCheat();
		if(cheated){
			// Call callbacks
			m_script->on_cheat(playersao, "moved_too_fast");
		}

		/*infostream<<"Server::ProcessData(): Moved player "<<peer_id<<" to "
				<<"("<<position.X<<","<<position.Y<<","<<position.Z<<")"
				<<" pitch="<<pitch<<" yaw="<<yaw<<std::endl;*/
	}
	else if(command == TOSERVER_DELETEDBLOCKS)
	{
		if(datasize < 2+1)
			return;

		/*
			[0] u16 command
			[2] u8 count
			[3] v3s16 pos_0
			[3+6] v3s16 pos_1
			...
		*/

		u16 count = data[2];
		for(u16 i=0; i<count; i++)
		{
			if((s16)datasize < 2+1+(i+1)*6)
				throw con::InvalidIncomingDataException
					("DELETEDBLOCKS length is too short");
			v3s16 p = readV3S16(&data[2+1+i*6]);
			/*infostream<<"Server: DELETEDBLOCKS ("
					<<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
			RemoteClient *client = getClient(peer_id);
			client->SetBlockNotSent(p);
		}
	}
	else if(command == TOSERVER_CLICK_OBJECT)
	{
		infostream<<"Server: CLICK_OBJECT not supported anymore"<<std::endl;
		return;
	}
	else if(command == TOSERVER_CLICK_ACTIVEOBJECT)
	{
		infostream<<"Server: CLICK_ACTIVEOBJECT not supported anymore"<<std::endl;
		return;
	}
	else if(command == TOSERVER_GROUND_ACTION)
	{
		infostream<<"Server: GROUND_ACTION not supported anymore"<<std::endl;
		return;

	}
	else if(command == TOSERVER_RELEASE)
	{
		infostream<<"Server: RELEASE not supported anymore"<<std::endl;
		return;
	}
	else if(command == TOSERVER_SIGNTEXT)
	{
		infostream<<"Server: SIGNTEXT not supported anymore"
				<<std::endl;
		return;
	}
	else if(command == TOSERVER_SIGNNODETEXT)
	{
		infostream<<"Server: SIGNNODETEXT not supported anymore"
				<<std::endl;
		return;
	}
	else if(command == TOSERVER_INVENTORY_ACTION)
	{
		// Strip command and create a stream
		std::string datastring((char*)&data[2], datasize-2);
		verbosestream<<"TOSERVER_INVENTORY_ACTION: data="<<datastring<<std::endl;
		std::istringstream is(datastring, std::ios_base::binary);
		// Create an action
		InventoryAction *a = InventoryAction::deSerialize(is);
		if(a == NULL)
		{
			infostream<<"TOSERVER_INVENTORY_ACTION: "
					<<"InventoryAction::deSerialize() returned NULL"
					<<std::endl;
			return;
		}

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

		/*
			Note: Always set inventory not sent, to repair cases
			where the client made a bad prediction.
		*/

		/*
			Handle restrictions and special cases of the move action
		*/
		if(a->getType() == IACTION_MOVE)
		{
			IMoveAction *ma = (IMoveAction*)a;

			ma->from_inv.applyCurrentPlayer(player->getName());
			ma->to_inv.applyCurrentPlayer(player->getName());

			setInventoryModified(ma->from_inv);
			setInventoryModified(ma->to_inv);

			bool from_inv_is_current_player =
				(ma->from_inv.type == InventoryLocation::PLAYER) &&
				(ma->from_inv.name == player->getName());

			bool to_inv_is_current_player =
				(ma->to_inv.type == InventoryLocation::PLAYER) &&
				(ma->to_inv.name == player->getName());

			/*
				Disable moving items out of craftpreview
			*/
			if(ma->from_list == "craftpreview")
			{
				infostream<<"Ignoring IMoveAction from "
						<<(ma->from_inv.dump())<<":"<<ma->from_list
						<<" to "<<(ma->to_inv.dump())<<":"<<ma->to_list
						<<" because src is "<<ma->from_list<<std::endl;
				delete a;
				return;
			}

			/*
				Disable moving items into craftresult and craftpreview
			*/
			if(ma->to_list == "craftpreview" || ma->to_list == "craftresult")
			{
				infostream<<"Ignoring IMoveAction from "
						<<(ma->from_inv.dump())<<":"<<ma->from_list
						<<" to "<<(ma->to_inv.dump())<<":"<<ma->to_list
						<<" because dst is "<<ma->to_list<<std::endl;
				delete a;
				return;
			}

			// Disallow moving items in elsewhere than player's inventory
			// if not allowed to interact
			if(!checkPriv(player->getName(), "interact") &&
					(!from_inv_is_current_player ||
					!to_inv_is_current_player))
			{
				infostream<<"Cannot move outside of player's inventory: "
						<<"No interact privilege"<<std::endl;
				delete a;
				return;
			}
		}
		/*
			Handle restrictions and special cases of the drop action
		*/
		else if(a->getType() == IACTION_DROP)
		{
			IDropAction *da = (IDropAction*)a;

			da->from_inv.applyCurrentPlayer(player->getName());

			setInventoryModified(da->from_inv);

			/*
				Disable dropping items out of craftpreview
			*/
			if(da->from_list == "craftpreview")
			{
				infostream<<"Ignoring IDropAction from "
						<<(da->from_inv.dump())<<":"<<da->from_list
						<<" because src is "<<da->from_list<<std::endl;
				delete a;
				return;
			}

			// Disallow dropping items if not allowed to interact
			if(!checkPriv(player->getName(), "interact"))
			{
				delete a;
				return;
			}
		}
		/*
			Handle restrictions and special cases of the craft action
		*/
		else if(a->getType() == IACTION_CRAFT)
		{
			ICraftAction *ca = (ICraftAction*)a;

			ca->craft_inv.applyCurrentPlayer(player->getName());

			setInventoryModified(ca->craft_inv);

			//bool craft_inv_is_current_player =
			//	(ca->craft_inv.type == InventoryLocation::PLAYER) &&
			//	(ca->craft_inv.name == player->getName());

			// Disallow crafting if not allowed to interact
			if(!checkPriv(player->getName(), "interact"))
			{
				infostream<<"Cannot craft: "
						<<"No interact privilege"<<std::endl;
				delete a;
				return;
			}
		}

		// Do the action
		a->apply(this, playersao, this);
		// Eat the action
		delete a;
	}
	else if(command == TOSERVER_CHAT_MESSAGE)
	{
		/*
			u16 command
			u16 length
			wstring message
		*/
		u8 buf[6];
		std::string datastring((char*)&data[2], datasize-2);
		std::istringstream is(datastring, std::ios_base::binary);

		// Read stuff
		is.read((char*)buf, 2);
		u16 len = readU16(buf);

		std::wstring message;
		for(u16 i=0; i<len; i++)
		{
			is.read((char*)buf, 2);
			message += (wchar_t)readU16(buf);
		}

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

		// Get player name of this client
		std::wstring name = narrow_to_wide(player->getName());

		// Run script hook
		bool ate = m_script->on_chat_message(player->getName(),
				wide_to_narrow(message));
		// If script ate the message, don't proceed
		if(ate)
			return;

		// Line to send to players
		std::wstring line;
		// Whether to send to the player that sent the line
		bool send_to_sender_only = false;

		// Commands are implemented in Lua, so only catch invalid
		// commands that were not "eaten" and send an error back
		if(message[0] == L'/')
		{
			message = message.substr(1);
			send_to_sender_only = true;
			if(message.length() == 0)
				line += L"-!- Empty command";
			else
				line += L"-!- Invalid command: " + str_split(message, L' ')[0];
		}
		else
		{
			if(checkPriv(player->getName(), "shout")){
				line += L"<";
				line += name;
				line += L"> ";
				line += message;
			} else {
				line += L"-!- You don't have permission to shout.";
				send_to_sender_only = true;
			}
		}

		if(line != L"")
		{
			/*
				Send the message to sender
			*/
			if (send_to_sender_only)
			{
				SendChatMessage(peer_id, line);
			}
			/*
				Send the message to others
			*/
			else
			{
				actionstream<<"CHAT: "<<wide_to_narrow(line)<<std::endl;

				std::list<u16> clients = m_clients.getClientIDs();

				for(std::list<u16>::iterator
					i = clients.begin();
					i != clients.end(); ++i)
				{
					if (*i != peer_id)
						SendChatMessage(*i, line);
				}
			}
		}
	}
	else if(command == TOSERVER_DAMAGE)
	{
		std::string datastring((char*)&data[2], datasize-2);
		std::istringstream is(datastring, std::ios_base::binary);
		u8 damage = readU8(is);

		if(g_settings->getBool("enable_damage"))
		{
			actionstream<<player->getName()<<" damaged by "
					<<(int)damage<<" hp at "<<PP(player->getPosition()/BS)
					<<std::endl;

			playersao->setHP(playersao->getHP() - damage);

			if(playersao->getHP() == 0 && playersao->m_hp_not_sent)
				DiePlayer(peer_id);

			if(playersao->m_hp_not_sent)
				SendPlayerHP(peer_id);
		}
	}
	else if(command == TOSERVER_BREATH)
	{
		std::string datastring((char*)&data[2], datasize-2);
		std::istringstream is(datastring, std::ios_base::binary);
		u16 breath = readU16(is);
		playersao->setBreath(breath);
		m_script->player_event(playersao,"breath_changed");
	}
	else if(command == TOSERVER_PASSWORD)
	{
		/*
			[0] u16 TOSERVER_PASSWORD
			[2] u8[28] old password
			[30] u8[28] new password
		*/

		if(datasize != 2+PASSWORD_SIZE*2)
			return;
		/*char password[PASSWORD_SIZE];
		for(u32 i=0; i<PASSWORD_SIZE-1; i++)
			password[i] = data[2+i];
		password[PASSWORD_SIZE-1] = 0;*/
		std::string oldpwd;
		for(u32 i=0; i<PASSWORD_SIZE-1; i++)
		{
			char c = data[2+i];
			if(c == 0)
				break;
			oldpwd += c;
		}
		std::string newpwd;
		for(u32 i=0; i<PASSWORD_SIZE-1; i++)
		{
			char c = data[2+PASSWORD_SIZE+i];
			if(c == 0)
				break;
			newpwd += c;
		}

		if(!base64_is_valid(newpwd)){
			infostream<<"Server: "<<player->getName()<<" supplied invalid password hash"<<std::endl;
			// Wrong old password supplied!!
			SendChatMessage(peer_id, L"Invalid new password hash supplied. Password NOT changed.");
			return;
		}

		infostream<<"Server: Client requests a password change from "
				<<"'"<<oldpwd<<"' to '"<<newpwd<<"'"<<std::endl;

		std::string playername = player->getName();

		std::string checkpwd;
		m_script->getAuth(playername, &checkpwd, NULL);

		if(oldpwd != checkpwd)
		{
			infostream<<"Server: invalid old password"<<std::endl;
			// Wrong old password supplied!!
			SendChatMessage(peer_id, L"Invalid old password supplied. Password NOT changed.");
			return;
		}

		bool success = m_script->setPassword(playername, newpwd);
		if(success){
			actionstream<<player->getName()<<" changes password"<<std::endl;
			SendChatMessage(peer_id, L"Password change successful.");
		} else {
			actionstream<<player->getName()<<" tries to change password but "
					<<"it fails"<<std::endl;
			SendChatMessage(peer_id, L"Password change failed or inavailable.");
		}
	}
	else if(command == TOSERVER_PLAYERITEM)
	{
		if (datasize < 2+2)
			return;

		u16 item = readU16(&data[2]);
		playersao->setWieldIndex(item);
	}
	else if(command == TOSERVER_RESPAWN)
	{
		if(player->hp != 0 || !g_settings->getBool("enable_damage"))
			return;

		RespawnPlayer(peer_id);

		actionstream<<player->getName()<<" respawns at "
				<<PP(player->getPosition()/BS)<<std::endl;

		// ActiveObject is added to environment in AsyncRunStep after
		// the previous addition has been succesfully removed
	}
	else if(command == TOSERVER_INTERACT)
	{
		std::string datastring((char*)&data[2], datasize-2);
		std::istringstream is(datastring, std::ios_base::binary);

		/*
			[0] u16 command
			[2] u8 action
			[3] u16 item
			[5] u32 length of the next item
			[9] serialized PointedThing
			actions:
			0: start digging (from undersurface) or use
			1: stop digging (all parameters ignored)
			2: digging completed
			3: place block or item (to abovesurface)
			4: use item
		*/
		u8 action = readU8(is);
		u16 item_i = readU16(is);
		std::istringstream tmp_is(deSerializeLongString(is), std::ios::binary);
		PointedThing pointed;
		pointed.deSerialize(tmp_is);

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

		if(player->hp == 0)
		{
			verbosestream<<"TOSERVER_INTERACT: "<<player->getName()
				<<" tried to interact, but is dead!"<<std::endl;
			return;
		}

		v3f player_pos = playersao->getLastGoodPosition();

		// Update wielded item
		playersao->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;
		}

		/*
			Check that target is reasonably close
			(only when digging or placing things)
		*/
		if(action == 0 || action == 2 || action == 3)
		{
			float d = player_pos.getDistanceFrom(pointed_pos_under);
			float max_d = BS * 14; // Just some large enough value
			if(d > max_d){
				actionstream<<"Player "<<player->getName()
						<<" tried to access "<<pointed.dump()
						<<" from too far: "
						<<"d="<<d<<", max_d="<<max_d
						<<". ignoring."<<std::endl;
				// 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);
				// Call callbacks
				m_script->on_cheat(playersao, "interacted_too_far");
				// Do nothing else
				return;
			}
		}

		/*
			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 == 2){
				v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
				client->SetBlockNotSent(blockpos);
			}
			// Placement -> above
			if(action == 3){
				v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, 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 == 0)
		{
			if(pointed.type == POINTEDTHING_NODE)
			{
				/*
					NOTE: This can be used in the future to check if
					somebody is cheating, by checking the timing.
				*/
				MapNode n(CONTENT_IGNORE);
				bool pos_ok;
				n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
				if (pos_ok)
					n = m_env->getMap().getNodeNoEx(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 has been removed
				if(pointed_object->m_removed)
					return;

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

				ItemStack punchitem = playersao->getWieldedItem();
				ToolCapabilities toolcap =
						punchitem.getToolCapabilities(m_itemdef);
				v3f dir = (pointed_object->getBasePosition() -
						(player->getPosition() + player->getEyeOffset())
							).normalize();
				float time_from_last_punch =
					playersao->resetTimeFromLastPunch();
				pointed_object->punch(dir, &toolcap, playersao,
						time_from_last_punch);
			}

		} // action == 0

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

		/*
			2: Digging completed
		*/
		else if(action == 2)
		{
			// Only digging of nodes
			if(pointed.type == POINTEDTHING_NODE)
			{
				bool pos_ok;
				MapNode n = m_env->getMap().getNodeNoEx(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(!isSingleplayer() && !g_settings->getBool("disable_anticheat"))
				{
					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: NoCheat: "<<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
					ItemStack playeritem;
					InventoryList *mlist = playersao->getInventory()->getList("main");
					if(mlist != NULL)
						playeritem = mlist->getItem(playersao->getWieldIndex());
					ToolCapabilities playeritem_toolcap =
							playeritem.getToolCapabilities(m_itemdef);
					// Get diggability and expected digging time
					DigParams params = getDigParams(m_nodedef->get(n).groups,
							&playeritem_toolcap);
					// If can't dig, try hand
					if(!params.diggable){
						const ItemDefinition &hand = m_itemdef->get("");
						const ToolCapabilities *tp = hand.tool_capabilities;
						if(tp)
							params = getDigParams(m_nodedef->get(n).groups, tp);
					}
					// If can't dig, ignore dig
					if(!params.diggable){
						infostream<<"Server: NoCheat: "<<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: NoCheat: "<<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().getNodeNoEx(p_under).getContent() != CONTENT_AIR)
				{
					// Re-send block to revert change on client-side
					client->SetBlockNotSent(blockpos);
				}
				else {
					client->ResendBlockIfOnWire(blockpos);
				}
			}
		} // action == 2

		/*
			3: place block or right-click object
		*/
		else if(action == 3)
		{
			ItemStack item = playersao->getWieldedItem();

			// Reset build time counter
			if(pointed.type == POINTEDTHING_NODE &&
					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 has been removed
				if(pointed_object->m_removed)
					return;

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

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

				// Apply returned ItemStack
				playersao->setWieldedItem(item);
			}

			// 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(item.getDefinition(m_itemdef).node_placement_prediction != "") {
				client->SetBlockNotSent(blockpos);
				if(blockpos2 != blockpos) {
					client->SetBlockNotSent(blockpos2);
				}
			}
			else {
				client->ResendBlockIfOnWire(blockpos);
				if(blockpos2 != blockpos) {
					client->ResendBlockIfOnWire(blockpos2);
				}
			}
		} // action == 3

		/*
			4: use
		*/
		else if(action == 4)
		{
			ItemStack item = playersao->getWieldedItem();

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

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

		} // action == 4
		

		/*
			Catch invalid actions
		*/
		else
		{
			infostream<<"WARNING: Server: Invalid action "
					<<action<<std::endl;
		}
	}
	else if(command == TOSERVER_REMOVED_SOUNDS)
	{
		std::string datastring((char*)&data[2], datasize-2);
		std::istringstream is(datastring, std::ios_base::binary);

		int num = readU16(is);
		for(int k=0; k<num; k++){
			s32 id = readS32(is);
			std::map<s32, ServerPlayingSound>::iterator i =
					m_playing_sounds.find(id);
			if(i == m_playing_sounds.end())
				continue;
			ServerPlayingSound &psound = i->second;
			psound.clients.erase(peer_id);
			if(psound.clients.size() == 0)
				m_playing_sounds.erase(i++);
		}
	}
	else if(command == TOSERVER_NODEMETA_FIELDS)
	{
		std::string datastring((char*)&data[2], datasize-2);
		std::istringstream is(datastring, std::ios_base::binary);

		v3s16 p = readV3S16(is);
		std::string formname = deSerializeString(is);
		int num = readU16(is);
		std::map<std::string, std::string> fields;
		for(int k=0; k<num; k++){
			std::string fieldname = deSerializeString(is);
			std::string fieldvalue = deSerializeLongString(is);
			fields[fieldname] = fieldvalue;
		}

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

		// Check the target node for rollback data; leave others unnoticed
		RollbackNode rn_old(&m_env->getMap(), p, this);

		m_script->node_on_receive_fields(p, formname, fields,playersao);

		// Report rollback data
		RollbackNode rn_new(&m_env->getMap(), p, this);
		if(rollback() && rn_new != rn_old){
			RollbackAction action;
			action.setSetNode(p, rn_old, rn_new);
			rollback()->reportAction(action);
		}
	}
	else if(command == TOSERVER_INVENTORY_FIELDS)
	{
		std::string datastring((char*)&data[2], datasize-2);
		std::istringstream is(datastring, std::ios_base::binary);

		std::string formname = deSerializeString(is);
		int num = readU16(is);
		std::map<std::string, std::string> fields;
		for(int k=0; k<num; k++){
			std::string fieldname = deSerializeString(is);
			std::string fieldvalue = deSerializeLongString(is);
			fields[fieldname] = fieldvalue;
		}

		m_script->on_playerReceiveFields(playersao, formname, fields);
	}
	else
	{
		infostream<<"Server::ProcessData(): Ignoring "
				"unknown command "<<command<<std::endl;
	}

	} //try
	catch(SendFailedException &e)
	{
		errorstream<<"Server::ProcessData(): SendFailedException: "
				<<"what="<<e.what()
				<<std::endl;
	}
}

void Server::setTimeOfDay(u32 time)
{
	m_env->setTimeOfDay(time);
	m_time_of_day_send_timer = 0;
}

void Server::onMapEditEvent(MapEditEvent *event)
{
	//infostream<<"Server::onMapEditEvent()"<<std::endl;
	if(m_ignore_map_edit_events)
		return;
	if(m_ignore_map_edit_events_area.contains(event->getArea()))
		return;
	MapEditEvent *e = event->clone();
	m_unsent_map_edit_queue.push_back(e);
}

Inventory* Server::getInventory(const InventoryLocation &loc)
{
	switch(loc.type){
	case InventoryLocation::UNDEFINED:
	{}
	break;
	case InventoryLocation::CURRENT_PLAYER:
	{}
	break;
	case InventoryLocation::PLAYER:
	{
		Player *player = m_env->getPlayer(loc.name.c_str());
		if(!player)
			return NULL;
		PlayerSAO *playersao = player->getPlayerSAO();
		if(!playersao)
			return NULL;
		return playersao->getInventory();
	}
	break;
	case InventoryLocation::NODEMETA:
	{
		NodeMetadata *meta = m_env->getMap().getNodeMetadata(loc.p);
		if(!meta)
			return NULL;
		return meta->getInventory();
	}
	break;
	case InventoryLocation::DETACHED:
	{
		if(m_detached_inventories.count(loc.name) == 0)
			return NULL;
		return m_detached_inventories[loc.name];
	}
	break;
	default:
		assert(0);
	}
	return NULL;
}
void Server::setInventoryModified(const InventoryLocation &loc)
{
	switch(loc.type){
	case InventoryLocation::UNDEFINED:
	{}
	break;
	case InventoryLocation::PLAYER:
	{
		Player *player = m_env->getPlayer(loc.name.c_str());
		if(!player)
			return;
		PlayerSAO *playersao = player->getPlayerSAO();
		if(!playersao)
			return;
		playersao->m_inventory_not_sent = true;
		playersao->m_wielded_item_not_sent = true;
	}
	break;
	case InventoryLocation::NODEMETA:
	{
		v3s16 blockpos = getNodeBlockPos(loc.p);

		MapBlock *block = m_env->getMap().getBlockNoCreateNoEx(blockpos);
		if(block)
			block->raiseModified(MOD_STATE_WRITE_NEEDED);

		setBlockNotSent(blockpos);
	}
	break;
	case InventoryLocation::DETACHED:
	{
		sendDetachedInventory(loc.name,PEER_ID_INEXISTENT);
	}
	break;
	default:
		assert(0);
	}
}

void Server::SetBlocksNotSent(std::map<v3s16, MapBlock *>& block)
{
	std::list<u16> clients = m_clients.getClientIDs();
	m_clients.Lock();
	// Set the modified blocks unsent for all the clients
	for (std::list<u16>::iterator
		 i = clients.begin();
		 i != clients.end(); ++i) {
			RemoteClient *client = m_clients.lockedGetClientNoEx(*i);
			if (client != NULL)
				client->SetBlocksNotSent(block);
		}
	m_clients.Unlock();
}

void Server::peerAdded(con::Peer *peer)
{
	DSTACK(__FUNCTION_NAME);
	verbosestream<<"Server::peerAdded(): peer->id="
			<<peer->id<<std::endl;

	con::PeerChange c;
	c.type = con::PEER_ADDED;
	c.peer_id = peer->id;
	c.timeout = false;
	m_peer_change_queue.push_back(c);
}

void Server::deletingPeer(con::Peer *peer, bool timeout)
{
	DSTACK(__FUNCTION_NAME);
	verbosestream<<"Server::deletingPeer(): peer->id="
			<<peer->id<<", timeout="<<timeout<<std::endl;

	m_clients.event(peer->id, CSE_Disconnect);
	con::PeerChange c;
	c.type = con::PEER_REMOVED;
	c.peer_id = peer->id;
	c.timeout = timeout;
	m_peer_change_queue.push_back(c);
}

bool Server::getClientConInfo(u16 peer_id, con::rtt_stat_type type, float* retval)
{
	*retval = m_con.getPeerStat(peer_id,type);
	if (*retval == -1) return false;
	return true;
}

bool Server::getClientInfo(
		u16          peer_id,
		ClientState* state,
		u32*         uptime,
		u8*          ser_vers,
		u16*         prot_vers,
		u8*          major,
		u8*          minor,
		u8*          patch,
		std::string* vers_string
	)
{
	*state = m_clients.getClientState(peer_id);
	m_clients.Lock();
	RemoteClient* client = m_clients.lockedGetClientNoEx(peer_id, CS_Invalid);

	if (client == NULL) {
		m_clients.Unlock();
		return false;
	}

	*uptime = client->uptime();
	*ser_vers = client->serialization_version;
	*prot_vers = client->net_proto_version;

	*major = client->getMajor();
	*minor = client->getMinor();
	*patch = client->getPatch();
	*vers_string = client->getPatch();

	m_clients.Unlock();

	return true;
}

void Server::handlePeerChanges()
{
	while(m_peer_change_queue.size() > 0)
	{
		con::PeerChange c = m_peer_change_queue.pop_front();

		verbosestream<<"Server: Handling peer change: "
				<<"id="<<c.peer_id<<", timeout="<<c.timeout
				<<std::endl;

		switch(c.type)
		{
		case con::PEER_ADDED:
			m_clients.CreateClient(c.peer_id);
			break;

		case con::PEER_REMOVED:
			DeleteClient(c.peer_id, c.timeout?CDR_TIMEOUT:CDR_LEAVE);
			break;

		default:
			assert("Invalid peer change event received!" == 0);
			break;
		}
	}
}

void Server::SendMovement(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	std::ostringstream os(std::ios_base::binary);

	writeU16(os, TOCLIENT_MOVEMENT);
	writeF1000(os, g_settings->getFloat("movement_acceleration_default"));
	writeF1000(os, g_settings->getFloat("movement_acceleration_air"));
	writeF1000(os, g_settings->getFloat("movement_acceleration_fast"));
	writeF1000(os, g_settings->getFloat("movement_speed_walk"));
	writeF1000(os, g_settings->getFloat("movement_speed_crouch"));
	writeF1000(os, g_settings->getFloat("movement_speed_fast"));
	writeF1000(os, g_settings->getFloat("movement_speed_climb"));
	writeF1000(os, g_settings->getFloat("movement_speed_jump"));
	writeF1000(os, g_settings->getFloat("movement_liquid_fluidity"));
	writeF1000(os, g_settings->getFloat("movement_liquid_fluidity_smooth"));
	writeF1000(os, g_settings->getFloat("movement_liquid_sink"));
	writeF1000(os, g_settings->getFloat("movement_gravity"));

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendHP(u16 peer_id, u8 hp)
{
	DSTACK(__FUNCTION_NAME);
	std::ostringstream os(std::ios_base::binary);

	writeU16(os, TOCLIENT_HP);
	writeU8(os, hp);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendBreath(u16 peer_id, u16 breath)
{
	DSTACK(__FUNCTION_NAME);
	std::ostringstream os(std::ios_base::binary);

	writeU16(os, TOCLIENT_BREATH);
	writeU16(os, breath);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendAccessDenied(u16 peer_id,const std::wstring &reason)
{
	DSTACK(__FUNCTION_NAME);
	std::ostringstream os(std::ios_base::binary);

	writeU16(os, TOCLIENT_ACCESS_DENIED);
	os<<serializeWideString(reason);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendDeathscreen(u16 peer_id,bool set_camera_point_target,
		v3f camera_point_target)
{
	DSTACK(__FUNCTION_NAME);
	std::ostringstream os(std::ios_base::binary);

	writeU16(os, TOCLIENT_DEATHSCREEN);
	writeU8(os, set_camera_point_target);
	writeV3F1000(os, camera_point_target);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendItemDef(u16 peer_id,
		IItemDefManager *itemdef, u16 protocol_version)
{
	DSTACK(__FUNCTION_NAME);
	std::ostringstream os(std::ios_base::binary);

	/*
		u16 command
		u32 length of the next item
		zlib-compressed serialized ItemDefManager
	*/
	writeU16(os, TOCLIENT_ITEMDEF);
	std::ostringstream tmp_os(std::ios::binary);
	itemdef->serialize(tmp_os, protocol_version);
	std::ostringstream tmp_os2(std::ios::binary);
	compressZlib(tmp_os.str(), tmp_os2);
	os<<serializeLongString(tmp_os2.str());

	// Make data buffer
	std::string s = os.str();
	verbosestream<<"Server: Sending item definitions to id("<<peer_id
			<<"): size="<<s.size()<<std::endl;
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendNodeDef(u16 peer_id,
		INodeDefManager *nodedef, u16 protocol_version)
{
	DSTACK(__FUNCTION_NAME);
	std::ostringstream os(std::ios_base::binary);

	/*
		u16 command
		u32 length of the next item
		zlib-compressed serialized NodeDefManager
	*/
	writeU16(os, TOCLIENT_NODEDEF);
	std::ostringstream tmp_os(std::ios::binary);
	nodedef->serialize(tmp_os, protocol_version);
	std::ostringstream tmp_os2(std::ios::binary);
	compressZlib(tmp_os.str(), tmp_os2);
	os<<serializeLongString(tmp_os2.str());

	// Make data buffer
	std::string s = os.str();
	verbosestream<<"Server: Sending node definitions to id("<<peer_id
			<<"): size="<<s.size()<<std::endl;
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

/*
	Non-static send methods
*/

void Server::SendInventory(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);

	PlayerSAO *playersao = getPlayerSAO(peer_id);
	assert(playersao);

	playersao->m_inventory_not_sent = false;

	/*
		Serialize it
	*/

	std::ostringstream os;
	playersao->getInventory()->serialize(os);

	std::string s = os.str();

	SharedBuffer<u8> data(s.size()+2);
	writeU16(&data[0], TOCLIENT_INVENTORY);
	memcpy(&data[2], s.c_str(), s.size());

	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendChatMessage(u16 peer_id, const std::wstring &message)
{
	DSTACK(__FUNCTION_NAME);

	std::ostringstream os(std::ios_base::binary);
	u8 buf[12];

	// Write command
	writeU16(buf, TOCLIENT_CHAT_MESSAGE);
	os.write((char*)buf, 2);

	// Write length
	writeU16(buf, message.size());
	os.write((char*)buf, 2);

	// Write string
	for(u32 i=0; i<message.size(); i++)
	{
		u16 w = message[i];
		writeU16(buf, w);
		os.write((char*)buf, 2);
	}

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());

	if (peer_id != PEER_ID_INEXISTENT)
	{
		// Send as reliable
		m_clients.send(peer_id, 0, data, true);
	}
	else
	{
		m_clients.sendToAll(0,data,true);
	}
}

void Server::SendShowFormspecMessage(u16 peer_id, const std::string &formspec,
                                     const std::string &formname)
{
	DSTACK(__FUNCTION_NAME);

	std::ostringstream os(std::ios_base::binary);
	u8 buf[12];


	// Write command
	writeU16(buf, TOCLIENT_SHOW_FORMSPEC);
	os.write((char*)buf, 2);
	os<<serializeLongString(FORMSPEC_VERSION_STRING + formspec);
	os<<serializeString(formname);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

// Spawns a particle on peer with peer_id
void Server::SendSpawnParticle(u16 peer_id, v3f pos, v3f velocity, v3f acceleration,
				float expirationtime, float size, bool collisiondetection,
				bool vertical, std::string texture)
{
	DSTACK(__FUNCTION_NAME);

	std::ostringstream os(std::ios_base::binary);
	writeU16(os, TOCLIENT_SPAWN_PARTICLE);
	writeV3F1000(os, pos);
	writeV3F1000(os, velocity);
	writeV3F1000(os, acceleration);
	writeF1000(os, expirationtime);
	writeF1000(os, size);
	writeU8(os,  collisiondetection);
	os<<serializeLongString(texture);
	writeU8(os, vertical);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());

	if (peer_id != PEER_ID_INEXISTENT)
	{
	// Send as reliable
		m_clients.send(peer_id, 0, data, true);
	}
	else
	{
		m_clients.sendToAll(0,data,true);
	}
}

// Adds a ParticleSpawner on peer with peer_id
void Server::SendAddParticleSpawner(u16 peer_id, u16 amount, float spawntime, v3f minpos, v3f maxpos,
	v3f minvel, v3f maxvel, v3f minacc, v3f maxacc, float minexptime, float maxexptime,
	float minsize, float maxsize, bool collisiondetection, bool vertical, std::string texture, u32 id)
{
	DSTACK(__FUNCTION_NAME);

	std::ostringstream os(std::ios_base::binary);
	writeU16(os, TOCLIENT_ADD_PARTICLESPAWNER);

	writeU16(os, amount);
	writeF1000(os, spawntime);
	writeV3F1000(os, minpos);
	writeV3F1000(os, maxpos);
	writeV3F1000(os, minvel);
	writeV3F1000(os, maxvel);
	writeV3F1000(os, minacc);
	writeV3F1000(os, maxacc);
	writeF1000(os, minexptime);
	writeF1000(os, maxexptime);
	writeF1000(os, minsize);
	writeF1000(os, maxsize);
	writeU8(os,  collisiondetection);
	os<<serializeLongString(texture);
	writeU32(os, id);
	writeU8(os, vertical);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());

	if (peer_id != PEER_ID_INEXISTENT)
	{
		// Send as reliable
		m_clients.send(peer_id, 0, data, true);
	}
	else {
		m_clients.sendToAll(0,data,true);
	}
}

void Server::SendDeleteParticleSpawner(u16 peer_id, u32 id)
{
	DSTACK(__FUNCTION_NAME);

	std::ostringstream os(std::ios_base::binary);
	writeU16(os, TOCLIENT_DELETE_PARTICLESPAWNER);

	writeU16(os, id);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());

	if (peer_id != PEER_ID_INEXISTENT) {
		// Send as reliable
		m_clients.send(peer_id, 0, data, true);
	}
	else {
		m_clients.sendToAll(0,data,true);
	}

}

void Server::SendHUDAdd(u16 peer_id, u32 id, HudElement *form)
{
	std::ostringstream os(std::ios_base::binary);

	// Write command
	writeU16(os, TOCLIENT_HUDADD);
	writeU32(os, id);
	writeU8(os, (u8)form->type);
	writeV2F1000(os, form->pos);
	os << serializeString(form->name);
	writeV2F1000(os, form->scale);
	os << serializeString(form->text);
	writeU32(os, form->number);
	writeU32(os, form->item);
	writeU32(os, form->dir);
	writeV2F1000(os, form->align);
	writeV2F1000(os, form->offset);
	writeV3F1000(os, form->world_pos);
	writeV2S32(os,form->size);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 1, data, true);
}

void Server::SendHUDRemove(u16 peer_id, u32 id)
{
	std::ostringstream os(std::ios_base::binary);

	// Write command
	writeU16(os, TOCLIENT_HUDRM);
	writeU32(os, id);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable

	m_clients.send(peer_id, 1, data, true);
}

void Server::SendHUDChange(u16 peer_id, u32 id, HudElementStat stat, void *value)
{
	std::ostringstream os(std::ios_base::binary);

	// Write command
	writeU16(os, TOCLIENT_HUDCHANGE);
	writeU32(os, id);
	writeU8(os, (u8)stat);
	switch (stat) {
		case HUD_STAT_POS:
		case HUD_STAT_SCALE:
		case HUD_STAT_ALIGN:
		case HUD_STAT_OFFSET:
			writeV2F1000(os, *(v2f *)value);
			break;
		case HUD_STAT_NAME:
		case HUD_STAT_TEXT:
			os << serializeString(*(std::string *)value);
			break;
		case HUD_STAT_WORLD_POS:
			writeV3F1000(os, *(v3f *)value);
			break;
		case HUD_STAT_SIZE:
			writeV2S32(os,*(v2s32 *)value);
			break;
		case HUD_STAT_NUMBER:
		case HUD_STAT_ITEM:
		case HUD_STAT_DIR:
		default:
			writeU32(os, *(u32 *)value);
			break;
	}

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8 *)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendHUDSetFlags(u16 peer_id, u32 flags, u32 mask)
{
	std::ostringstream os(std::ios_base::binary);

	// Write command
	writeU16(os, TOCLIENT_HUD_SET_FLAGS);

	//////////////////////////// compatibility code to be removed //////////////
	flags &= ~(HUD_FLAG_HEALTHBAR_VISIBLE | HUD_FLAG_BREATHBAR_VISIBLE);
	////////////////////////////////////////////////////////////////////////////
	writeU32(os, flags);
	writeU32(os, mask);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8 *)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendHUDSetParam(u16 peer_id, u16 param, const std::string &value)
{
	std::ostringstream os(std::ios_base::binary);

	// Write command
	writeU16(os, TOCLIENT_HUD_SET_PARAM);
	writeU16(os, param);
	os<<serializeString(value);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8 *)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendSetSky(u16 peer_id, const video::SColor &bgcolor,
		const std::string &type, const std::vector<std::string> &params)
{
	std::ostringstream os(std::ios_base::binary);

	// Write command
	writeU16(os, TOCLIENT_SET_SKY);
	writeARGB8(os, bgcolor);
	os<<serializeString(type);
	writeU16(os, params.size());
	for(size_t i=0; i<params.size(); i++)
		os<<serializeString(params[i]);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8 *)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendOverrideDayNightRatio(u16 peer_id, bool do_override,
		float ratio)
{
	std::ostringstream os(std::ios_base::binary);

	// Write command
	writeU16(os, TOCLIENT_OVERRIDE_DAY_NIGHT_RATIO);
	writeU8(os, do_override);
	writeU16(os, ratio*65535);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8 *)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendTimeOfDay(u16 peer_id, u16 time, f32 time_speed)
{
	DSTACK(__FUNCTION_NAME);

	// Make packet
	SharedBuffer<u8> data(2+2+4);
	writeU16(&data[0], TOCLIENT_TIME_OF_DAY);
	writeU16(&data[2], time);
	writeF1000(&data[4], time_speed);

	if (peer_id == PEER_ID_INEXISTENT) {
		m_clients.sendToAll(0,data,true);
	}
	else {
		// Send as reliable
		m_clients.send(peer_id, 0, data, true);
	}
}

void Server::SendPlayerHP(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	PlayerSAO *playersao = getPlayerSAO(peer_id);
	assert(playersao);
	playersao->m_hp_not_sent = false;
	SendHP(peer_id, playersao->getHP());
	m_script->player_event(playersao,"health_changed");

	// Send to other clients
	std::string str = gob_cmd_punched(playersao->readDamage(), playersao->getHP());
	ActiveObjectMessage aom(playersao->getId(), true, str);
	playersao->m_messages_out.push_back(aom);
}

void Server::SendPlayerBreath(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	PlayerSAO *playersao = getPlayerSAO(peer_id);
	assert(playersao);
	playersao->m_breath_not_sent = false;
	m_script->player_event(playersao,"breath_changed");
	SendBreath(peer_id, playersao->getBreath());
}

void Server::SendMovePlayer(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	Player *player = m_env->getPlayer(peer_id);
	assert(player);

	std::ostringstream os(std::ios_base::binary);
	writeU16(os, TOCLIENT_MOVE_PLAYER);
	writeV3F1000(os, player->getPosition());
	writeF1000(os, player->getPitch());
	writeF1000(os, player->getYaw());

	{
		v3f pos = player->getPosition();
		f32 pitch = player->getPitch();
		f32 yaw = player->getYaw();
		verbosestream<<"Server: Sending TOCLIENT_MOVE_PLAYER"
				<<" pos=("<<pos.X<<","<<pos.Y<<","<<pos.Z<<")"
				<<" pitch="<<pitch
				<<" yaw="<<yaw
				<<std::endl;
	}

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendLocalPlayerAnimations(u16 peer_id, v2s32 animation_frames[4], f32 animation_speed)
{
	std::ostringstream os(std::ios_base::binary);

	writeU16(os, TOCLIENT_LOCAL_PLAYER_ANIMATIONS);
	writeV2S32(os, animation_frames[0]);
	writeV2S32(os, animation_frames[1]);
	writeV2S32(os, animation_frames[2]);
	writeV2S32(os, animation_frames[3]);
	writeF1000(os, animation_speed);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8 *)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendEyeOffset(u16 peer_id, v3f first, v3f third)
{
	std::ostringstream os(std::ios_base::binary);

	writeU16(os, TOCLIENT_EYE_OFFSET);
	writeV3F1000(os, first);
	writeV3F1000(os, third);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8 *)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}
void Server::SendPlayerPrivileges(u16 peer_id)
{
	Player *player = m_env->getPlayer(peer_id);
	assert(player);
	if(player->peer_id == PEER_ID_INEXISTENT)
		return;

	std::set<std::string> privs;
	m_script->getAuth(player->getName(), NULL, &privs);

	std::ostringstream os(std::ios_base::binary);
	writeU16(os, TOCLIENT_PRIVILEGES);
	writeU16(os, privs.size());
	for(std::set<std::string>::const_iterator i = privs.begin();
			i != privs.end(); i++){
		os<<serializeString(*i);
	}

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

void Server::SendPlayerInventoryFormspec(u16 peer_id)
{
	Player *player = m_env->getPlayer(peer_id);
	assert(player);
	if(player->peer_id == PEER_ID_INEXISTENT)
		return;

	std::ostringstream os(std::ios_base::binary);
	writeU16(os, TOCLIENT_INVENTORY_FORMSPEC);
	os<<serializeLongString(FORMSPEC_VERSION_STRING + player->inventory_formspec);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

s32 Server::playSound(const SimpleSoundSpec &spec,
		const ServerSoundParams &params)
{
	// Find out initial position of sound
	bool pos_exists = false;
	v3f pos = params.getPos(m_env, &pos_exists);
	// If position is not found while it should be, cancel sound
	if(pos_exists != (params.type != ServerSoundParams::SSP_LOCAL))
		return -1;

	// Filter destination clients
	std::list<u16> dst_clients;
	if(params.to_player != "")
	{
		Player *player = m_env->getPlayer(params.to_player.c_str());
		if(!player){
			infostream<<"Server::playSound: Player \""<<params.to_player
					<<"\" not found"<<std::endl;
			return -1;
		}
		if(player->peer_id == PEER_ID_INEXISTENT){
			infostream<<"Server::playSound: Player \""<<params.to_player
					<<"\" not connected"<<std::endl;
			return -1;
		}
		dst_clients.push_back(player->peer_id);
	}
	else
	{
		std::list<u16> clients = m_clients.getClientIDs();

		for(std::list<u16>::iterator
				i = clients.begin(); i != clients.end(); ++i)
		{
			Player *player = m_env->getPlayer(*i);
			if(!player)
				continue;
			if(pos_exists){
				if(player->getPosition().getDistanceFrom(pos) >
						params.max_hear_distance)
					continue;
			}
			dst_clients.push_back(*i);
		}
	}
	if(dst_clients.size() == 0)
		return -1;

	// Create the sound
	s32 id = m_next_sound_id++;
	// The sound will exist as a reference in m_playing_sounds
	m_playing_sounds[id] = ServerPlayingSound();
	ServerPlayingSound &psound = m_playing_sounds[id];
	psound.params = params;
	for(std::list<u16>::iterator i = dst_clients.begin();
			i != dst_clients.end(); i++)
		psound.clients.insert(*i);
	// Create packet
	std::ostringstream os(std::ios_base::binary);
	writeU16(os, TOCLIENT_PLAY_SOUND);
	writeS32(os, id);
	os<<serializeString(spec.name);
	writeF1000(os, spec.gain * params.gain);
	writeU8(os, params.type);
	writeV3F1000(os, pos);
	writeU16(os, params.object);
	writeU8(os, params.loop);
	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send
	for(std::list<u16>::iterator i = dst_clients.begin();
			i != dst_clients.end(); i++){
		// Send as reliable
		m_clients.send(*i, 0, data, true);
	}
	return id;
}
void Server::stopSound(s32 handle)
{
	// Get sound reference
	std::map<s32, ServerPlayingSound>::iterator i =
			m_playing_sounds.find(handle);
	if(i == m_playing_sounds.end())
		return;
	ServerPlayingSound &psound = i->second;
	// Create packet
	std::ostringstream os(std::ios_base::binary);
	writeU16(os, TOCLIENT_STOP_SOUND);
	writeS32(os, handle);
	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
	// Send
	for(std::set<u16>::iterator i = psound.clients.begin();
			i != psound.clients.end(); i++){
		// Send as reliable
		m_clients.send(*i, 0, data, true);
	}
	// Remove sound reference
	m_playing_sounds.erase(i);
}

void Server::sendRemoveNode(v3s16 p, u16 ignore_id,
	std::list<u16> *far_players, float far_d_nodes)
{
	float maxd = far_d_nodes*BS;
	v3f p_f = intToFloat(p, BS);

	// Create packet
	u32 replysize = 8;
	SharedBuffer<u8> reply(replysize);
	writeU16(&reply[0], TOCLIENT_REMOVENODE);
	writeS16(&reply[2], p.X);
	writeS16(&reply[4], p.Y);
	writeS16(&reply[6], p.Z);

	std::list<u16> clients = m_clients.getClientIDs();
	for(std::list<u16>::iterator
		i = clients.begin();
		i != clients.end(); ++i)
	{
		if(far_players)
		{
			// Get player
			Player *player = m_env->getPlayer(*i);
			if(player)
			{
				// If player is far away, only set modified blocks not sent
				v3f player_pos = player->getPosition();
				if(player_pos.getDistanceFrom(p_f) > maxd)
				{
					far_players->push_back(*i);
					continue;
				}
			}
		}

		// Send as reliable
		m_clients.send(*i, 0, reply, true);
	}
}

void Server::sendAddNode(v3s16 p, MapNode n, u16 ignore_id,
		std::list<u16> *far_players, float far_d_nodes,
		bool remove_metadata)
{
	float maxd = far_d_nodes*BS;
	v3f p_f = intToFloat(p, BS);

	std::list<u16> clients = m_clients.getClientIDs();
		for(std::list<u16>::iterator
			i = clients.begin();
			i != clients.end(); ++i)
		{

		if(far_players)
		{
			// Get player
			Player *player = m_env->getPlayer(*i);
			if(player)
			{
				// If player is far away, only set modified blocks not sent
				v3f player_pos = player->getPosition();
				if(player_pos.getDistanceFrom(p_f) > maxd)
				{
					far_players->push_back(*i);
					continue;
				}
			}
		}
		SharedBuffer<u8> reply(0);
		m_clients.Lock();
		RemoteClient* client = m_clients.lockedGetClientNoEx(*i);
		if (client != 0)
		{
			// Create packet
			u32 replysize = 9 + MapNode::serializedLength(client->serialization_version);
			reply = SharedBuffer<u8>(replysize);
			writeU16(&reply[0], TOCLIENT_ADDNODE);
			writeS16(&reply[2], p.X);
			writeS16(&reply[4], p.Y);
			writeS16(&reply[6], p.Z);
			n.serialize(&reply[8], client->serialization_version);
			u32 index = 8 + MapNode::serializedLength(client->serialization_version);
			writeU8(&reply[index], remove_metadata ? 0 : 1);

			if (!remove_metadata) {
				if (client->net_proto_version <= 21) {
					// Old clients always clear metadata; fix it
					// by sending the full block again.
					client->SetBlockNotSent(p);
				}
			}
		}
		m_clients.Unlock();

		// Send as reliable
		if (reply.getSize() > 0)
			m_clients.send(*i, 0, reply, true);
	}
}

void Server::setBlockNotSent(v3s16 p)
{
	std::list<u16> clients = m_clients.getClientIDs();
	m_clients.Lock();
	for(std::list<u16>::iterator
		i = clients.begin();
		i != clients.end(); ++i)
	{
		RemoteClient *client = m_clients.lockedGetClientNoEx(*i);
		client->SetBlockNotSent(p);
	}
	m_clients.Unlock();
}

void Server::SendBlockNoLock(u16 peer_id, MapBlock *block, u8 ver, u16 net_proto_version)
{
	DSTACK(__FUNCTION_NAME);

	v3s16 p = block->getPos();

#if 0
	// Analyze it a bit
	bool completely_air = true;
	for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
	for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
	for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
	{
		if(block->getNodeNoEx(v3s16(x0,y0,z0)).d != CONTENT_AIR)
		{
			completely_air = false;
			x0 = y0 = z0 = MAP_BLOCKSIZE; // Break out
		}
	}

	// Print result
	infostream<<"Server: Sending block ("<<p.X<<","<<p.Y<<","<<p.Z<<"): ";
	if(completely_air)
		infostream<<"[completely air] ";
	infostream<<std::endl;
#endif

	/*
		Create a packet with the block in the right format
	*/

	std::ostringstream os(std::ios_base::binary);
	block->serialize(os, ver, false);
	block->serializeNetworkSpecific(os, net_proto_version);
	std::string s = os.str();
	SharedBuffer<u8> blockdata((u8*)s.c_str(), s.size());

	u32 replysize = 8 + blockdata.getSize();
	SharedBuffer<u8> reply(replysize);
	writeU16(&reply[0], TOCLIENT_BLOCKDATA);
	writeS16(&reply[2], p.X);
	writeS16(&reply[4], p.Y);
	writeS16(&reply[6], p.Z);
	memcpy(&reply[8], *blockdata, blockdata.getSize());

	/*infostream<<"Server: Sending block ("<<p.X<<","<<p.Y<<","<<p.Z<<")"
			<<":  \tpacket size: "<<replysize<<std::endl;*/

	/*
		Send packet
	*/
	m_clients.send(peer_id, 2, reply, true);
}

void Server::SendBlocks(float dtime)
{
	DSTACK(__FUNCTION_NAME);

	JMutexAutoLock envlock(m_env_mutex);
	//TODO check if one big lock could be faster then multiple small ones

	ScopeProfiler sp(g_profiler, "Server: sel and send blocks to clients");

	std::vector<PrioritySortedBlockTransfer> queue;

	s32 total_sending = 0;

	{
		ScopeProfiler sp(g_profiler, "Server: selecting blocks for sending");

		std::list<u16> clients = m_clients.getClientIDs();

		m_clients.Lock();
		for(std::list<u16>::iterator
			i = clients.begin();
			i != clients.end(); ++i)
		{
			RemoteClient *client = m_clients.lockedGetClientNoEx(*i, CS_Active);

			if (client == NULL)
				continue;

			total_sending += client->SendingCount();
			client->GetNextBlocks(m_env,m_emerge, dtime, queue);
		}
		m_clients.Unlock();
	}

	// Sort.
	// Lowest priority number comes first.
	// Lowest is most important.
	std::sort(queue.begin(), queue.end());

	m_clients.Lock();
	for(u32 i=0; i<queue.size(); i++)
	{
		//TODO: Calculate limit dynamically
		if(total_sending >= g_settings->getS32
				("max_simultaneous_block_sends_server_total"))
			break;

		PrioritySortedBlockTransfer q = queue[i];

		MapBlock *block = NULL;
		try
		{
			block = m_env->getMap().getBlockNoCreate(q.pos);
		}
		catch(InvalidPositionException &e)
		{
			continue;
		}

		RemoteClient *client = m_clients.lockedGetClientNoEx(q.peer_id, CS_Active);

		if(!client)
			continue;

		SendBlockNoLock(q.peer_id, block, client->serialization_version, client->net_proto_version);

		client->SentBlock(q.pos);
		total_sending++;
	}
	m_clients.Unlock();
}

void Server::fillMediaCache()
{
	DSTACK(__FUNCTION_NAME);

	infostream<<"Server: Calculating media file checksums"<<std::endl;

	// Collect all media file paths
	std::list<std::string> paths;
	for(std::vector<ModSpec>::iterator i = m_mods.begin();
			i != m_mods.end(); i++){
		const ModSpec &mod = *i;
		paths.push_back(mod.path + DIR_DELIM + "textures");
		paths.push_back(mod.path + DIR_DELIM + "sounds");
		paths.push_back(mod.path + DIR_DELIM + "media");
		paths.push_back(mod.path + DIR_DELIM + "models");
	}
	paths.push_back(porting::path_user + DIR_DELIM + "textures" + DIR_DELIM + "server");

	// Collect media file information from paths into cache
	for(std::list<std::string>::iterator i = paths.begin();
			i != paths.end(); i++)
	{
		std::string mediapath = *i;
		std::vector<fs::DirListNode> dirlist = fs::GetDirListing(mediapath);
		for(u32 j=0; j<dirlist.size(); j++){
			if(dirlist[j].dir) // Ignode dirs
				continue;
			std::string filename = dirlist[j].name;
			// If name contains illegal characters, ignore the file
			if(!string_allowed(filename, TEXTURENAME_ALLOWED_CHARS)){
				infostream<<"Server: ignoring illegal file name: \""
						<<filename<<"\""<<std::endl;
				continue;
			}
			// If name is not in a supported format, ignore it
			const char *supported_ext[] = {
				".png", ".jpg", ".bmp", ".tga",
				".pcx", ".ppm", ".psd", ".wal", ".rgb",
				".ogg",
				".x", ".b3d", ".md2", ".obj",
				NULL
			};
			if(removeStringEnd(filename, supported_ext) == ""){
				infostream<<"Server: ignoring unsupported file extension: \""
						<<filename<<"\""<<std::endl;
				continue;
			}
			// Ok, attempt to load the file and add to cache
			std::string filepath = mediapath + DIR_DELIM + filename;
			// Read data
			std::ifstream fis(filepath.c_str(), std::ios_base::binary);
			if(fis.good() == false){
				errorstream<<"Server::fillMediaCache(): Could not open \""
						<<filename<<"\" for reading"<<std::endl;
				continue;
			}
			std::ostringstream tmp_os(std::ios_base::binary);
			bool bad = false;
			for(;;){
				char buf[1024];
				fis.read(buf, 1024);
				std::streamsize len = fis.gcount();
				tmp_os.write(buf, len);
				if(fis.eof())
					break;
				if(!fis.good()){
					bad = true;
					break;
				}
			}
			if(bad){
				errorstream<<"Server::fillMediaCache(): Failed to read \""
						<<filename<<"\""<<std::endl;
				continue;
			}
			if(tmp_os.str().length() == 0){
				errorstream<<"Server::fillMediaCache(): Empty file \""
						<<filepath<<"\""<<std::endl;
				continue;
			}

			SHA1 sha1;
			sha1.addBytes(tmp_os.str().c_str(), tmp_os.str().length());

			unsigned char *digest = sha1.getDigest();
			std::string sha1_base64 = base64_encode(digest, 20);
			std::string sha1_hex = hex_encode((char*)digest, 20);
			free(digest);

			// Put in list
			this->m_media[filename] = MediaInfo(filepath, sha1_base64);
			verbosestream<<"Server: "<<sha1_hex<<" is "<<filename<<std::endl;
		}
	}
}

struct SendableMediaAnnouncement
{
	std::string name;
	std::string sha1_digest;

	SendableMediaAnnouncement(const std::string &name_="",
	                          const std::string &sha1_digest_=""):
		name(name_),
		sha1_digest(sha1_digest_)
	{}
};

void Server::sendMediaAnnouncement(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);

	verbosestream<<"Server: Announcing files to id("<<peer_id<<")"
			<<std::endl;

	std::list<SendableMediaAnnouncement> file_announcements;

	for(std::map<std::string, MediaInfo>::iterator i = m_media.begin();
			i != m_media.end(); i++){
		// Put in list
		file_announcements.push_back(
				SendableMediaAnnouncement(i->first, i->second.sha1_digest));
	}

	// Make packet
	std::ostringstream os(std::ios_base::binary);

	/*
		u16 command
		u32 number of files
		for each texture {
			u16 length of name
			string name
			u16 length of sha1_digest
			string sha1_digest
		}
	*/

	writeU16(os, TOCLIENT_ANNOUNCE_MEDIA);
	writeU16(os, file_announcements.size());

	for(std::list<SendableMediaAnnouncement>::iterator
			j = file_announcements.begin();
			j != file_announcements.end(); ++j){
		os<<serializeString(j->name);
		os<<serializeString(j->sha1_digest);
	}
	os<<serializeString(g_settings->get("remote_media"));

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());

	// Send as reliable
	m_clients.send(peer_id, 0, data, true);
}

struct SendableMedia
{
	std::string name;
	std::string path;
	std::string data;

	SendableMedia(const std::string &name_="", const std::string &path_="",
	              const std::string &data_=""):
		name(name_),
		path(path_),
		data(data_)
	{}
};

void Server::sendRequestedMedia(u16 peer_id,
		const std::list<std::string> &tosend)
{
	DSTACK(__FUNCTION_NAME);

	verbosestream<<"Server::sendRequestedMedia(): "
			<<"Sending files to client"<<std::endl;

	/* Read files */

	// Put 5kB in one bunch (this is not accurate)
	u32 bytes_per_bunch = 5000;

	std::vector< std::list<SendableMedia> > file_bunches;
	file_bunches.push_back(std::list<SendableMedia>());

	u32 file_size_bunch_total = 0;

	for(std::list<std::string>::const_iterator i = tosend.begin();
			i != tosend.end(); ++i)
	{
		const std::string &name = *i;

		if(m_media.find(name) == m_media.end()){
			errorstream<<"Server::sendRequestedMedia(): Client asked for "
					<<"unknown file \""<<(name)<<"\""<<std::endl;
			continue;
		}

		//TODO get path + name
		std::string tpath = m_media[name].path;

		// Read data
		std::ifstream fis(tpath.c_str(), std::ios_base::binary);
		if(fis.good() == false){
			errorstream<<"Server::sendRequestedMedia(): Could not open \""
					<<tpath<<"\" for reading"<<std::endl;
			continue;
		}
		std::ostringstream tmp_os(std::ios_base::binary);
		bool bad = false;
		for(;;){
			char buf[1024];
			fis.read(buf, 1024);
			std::streamsize len = fis.gcount();
			tmp_os.write(buf, len);
			file_size_bunch_total += len;
			if(fis.eof())
				break;
			if(!fis.good()){
				bad = true;
				break;
			}
		}
		if(bad){
			errorstream<<"Server::sendRequestedMedia(): Failed to read \""
					<<name<<"\""<<std::endl;
			continue;
		}
		/*infostream<<"Server::sendRequestedMedia(): Loaded \""
				<<tname<<"\""<<std::endl;*/
		// Put in list
		file_bunches[file_bunches.size()-1].push_back(
				SendableMedia(name, tpath, tmp_os.str()));

		// Start next bunch if got enough data
		if(file_size_bunch_total >= bytes_per_bunch){
			file_bunches.push_back(std::list<SendableMedia>());
			file_size_bunch_total = 0;
		}

	}

	/* Create and send packets */

	u32 num_bunches = file_bunches.size();
	for(u32 i=0; i<num_bunches; i++)
	{
		std::ostringstream os(std::ios_base::binary);

		/*
			u16 command
			u16 total number of texture bunches
			u16 index of this bunch
			u32 number of files in this bunch
			for each file {
				u16 length of name
				string name
				u32 length of data
				data
			}
		*/

		writeU16(os, TOCLIENT_MEDIA);
		writeU16(os, num_bunches);
		writeU16(os, i);
		writeU32(os, file_bunches[i].size());

		for(std::list<SendableMedia>::iterator
				j = file_bunches[i].begin();
				j != file_bunches[i].end(); ++j){
			os<<serializeString(j->name);
			os<<serializeLongString(j->data);
		}

		// Make data buffer
		std::string s = os.str();
		verbosestream<<"Server::sendRequestedMedia(): bunch "
				<<i<<"/"<<num_bunches
				<<" files="<<file_bunches[i].size()
				<<" size=" <<s.size()<<std::endl;
		SharedBuffer<u8> data((u8*)s.c_str(), s.size());
		// Send as reliable
		m_clients.send(peer_id, 2, data, true);
	}
}

void Server::sendDetachedInventory(const std::string &name, u16 peer_id)
{
	if(m_detached_inventories.count(name) == 0){
		errorstream<<__FUNCTION_NAME<<": \""<<name<<"\" not found"<<std::endl;
		return;
	}
	Inventory *inv = m_detached_inventories[name];

	std::ostringstream os(std::ios_base::binary);
	writeU16(os, TOCLIENT_DETACHED_INVENTORY);
	os<<serializeString(name);
	inv->serialize(os);

	// Make data buffer
	std::string s = os.str();
	SharedBuffer<u8> data((u8*)s.c_str(), s.size());

	if (peer_id != PEER_ID_INEXISTENT)
	{
		// Send as reliable
		m_clients.send(peer_id, 0, data, true);
	}
	else
	{
		m_clients.sendToAll(0,data,true);
	}
}

void Server::sendDetachedInventories(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);

	for(std::map<std::string, Inventory*>::iterator
			i = m_detached_inventories.begin();
			i != m_detached_inventories.end(); i++){
		const std::string &name = i->first;
		//Inventory *inv = i->second;
		sendDetachedInventory(name, peer_id);
	}
}

/*
	Something random
*/

void Server::DiePlayer(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);

	PlayerSAO *playersao = getPlayerSAO(peer_id);
	assert(playersao);

	infostream<<"Server::DiePlayer(): Player "
			<<playersao->getPlayer()->getName()
			<<" dies"<<std::endl;

	playersao->setHP(0);

	// Trigger scripted stuff
	m_script->on_dieplayer(playersao);

	SendPlayerHP(peer_id);
	SendDeathscreen(peer_id, false, v3f(0,0,0));
}

void Server::RespawnPlayer(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);

	PlayerSAO *playersao = getPlayerSAO(peer_id);
	assert(playersao);

	infostream<<"Server::RespawnPlayer(): Player "
			<<playersao->getPlayer()->getName()
			<<" respawns"<<std::endl;

	playersao->setHP(PLAYER_MAX_HP);

	bool repositioned = m_script->on_respawnplayer(playersao);
	if(!repositioned){
		v3f pos = findSpawnPos(m_env->getServerMap());
		playersao->setPos(pos);
	}
}

void Server::DenyAccess(u16 peer_id, const std::wstring &reason)
{
	DSTACK(__FUNCTION_NAME);

	SendAccessDenied(peer_id, reason);
	m_clients.event(peer_id, CSE_SetDenied);
	m_con.DisconnectPeer(peer_id);
}

void Server::DeleteClient(u16 peer_id, ClientDeletionReason reason)
{
	DSTACK(__FUNCTION_NAME);
	std::wstring message;
	{
		/*
			Clear references to playing sounds
		*/
		for(std::map<s32, ServerPlayingSound>::iterator
				i = m_playing_sounds.begin();
				i != m_playing_sounds.end();)
		{
			ServerPlayingSound &psound = i->second;
			psound.clients.erase(peer_id);
			if(psound.clients.size() == 0)
				m_playing_sounds.erase(i++);
			else
				i++;
		}

		Player *player = m_env->getPlayer(peer_id);

		// Collect information about leaving in chat
		{
			if(player != NULL && reason != CDR_DENY)
			{
				std::wstring name = narrow_to_wide(player->getName());
				message += L"*** ";
				message += name;
				message += L" left the game.";
				if(reason == CDR_TIMEOUT)
					message += L" (timed out)";
			}
		}

		/* Run scripts and remove from environment */
		{
			if(player != NULL)
			{
				PlayerSAO *playersao = player->getPlayerSAO();
				assert(playersao);

				m_script->on_leaveplayer(playersao);

				playersao->disconnected();
			}
		}

		/*
			Print out action
		*/
		{
			if(player != NULL && reason != CDR_DENY)
			{
				std::ostringstream os(std::ios_base::binary);
				std::list<u16> clients = m_clients.getClientIDs();

				for(std::list<u16>::iterator
					i = clients.begin();
					i != clients.end(); ++i)
				{
					// Get player
					Player *player = m_env->getPlayer(*i);
					if(!player)
						continue;
					// Get name of player
					os<<player->getName()<<" ";
				}

				actionstream<<player->getName()<<" "
						<<(reason==CDR_TIMEOUT?"times out.":"leaves game.")
						<<" List of players: "<<os.str()<<std::endl;
			}
		}
		{
			JMutexAutoLock env_lock(m_env_mutex);
			m_clients.DeleteClient(peer_id);
		}
	}

	// Send leave chat message to all remaining clients
	if(message.length() != 0)
		SendChatMessage(PEER_ID_INEXISTENT,message);
}

void Server::UpdateCrafting(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);

	Player* player = m_env->getPlayer(peer_id);
	assert(player);

	// Get a preview for crafting
	ItemStack preview;
	InventoryLocation loc;
	loc.setPlayer(player->getName());
	getCraftingResult(&player->inventory, preview, false, this);
	m_env->getScriptIface()->item_CraftPredict(preview, player->getPlayerSAO(), (&player->inventory)->getList("craft"), loc);

	// Put the new preview in
	InventoryList *plist = player->inventory.getList("craftpreview");
	assert(plist);
	assert(plist->getSize() >= 1);
	plist->changeItem(0, preview);
}

RemoteClient* Server::getClient(u16 peer_id, ClientState state_min)
{
	RemoteClient *client = getClientNoEx(peer_id,state_min);
	if(!client)
		throw ClientNotFoundException("Client not found");

	return client;
}
RemoteClient* Server::getClientNoEx(u16 peer_id, ClientState state_min)
{
	return m_clients.getClientNoEx(peer_id, state_min);
}

std::string Server::getPlayerName(u16 peer_id)
{
	Player *player = m_env->getPlayer(peer_id);
	if(player == NULL)
		return "[id="+itos(peer_id)+"]";
	return player->getName();
}

PlayerSAO* Server::getPlayerSAO(u16 peer_id)
{
	Player *player = m_env->getPlayer(peer_id);
	if(player == NULL)
		return NULL;
	return player->getPlayerSAO();
}

std::wstring Server::getStatusString()
{
	std::wostringstream os(std::ios_base::binary);
	os<<L"# Server: ";
	// Version
	os<<L"version="<<narrow_to_wide(minetest_version_simple);
	// Uptime
	os<<L", uptime="<<m_uptime.get();
	// Max lag estimate
	os<<L", max_lag="<<m_env->getMaxLagEstimate();
	// Information about clients
	bool first = true;
	os<<L", clients={";
	std::list<u16> clients = m_clients.getClientIDs();
	for(std::list<u16>::iterator i = clients.begin();
		i != clients.end(); ++i)
	{
		// Get player
		Player *player = m_env->getPlayer(*i);
		// Get name of player
		std::wstring name = L"unknown";
		if(player != NULL)
			name = narrow_to_wide(player->getName());
		// Add name to information string
		if(!first)
			os<<L", ";
		else
			first = false;
		os<<name;
	}
	os<<L"}";
	if(((ServerMap*)(&m_env->getMap()))->isSavingEnabled() == false)
		os<<std::endl<<L"# Server: "<<" WARNING: Map saving is disabled.";
	if(g_settings->get("motd") != "")
		os<<std::endl<<L"# Server: "<<narrow_to_wide(g_settings->get("motd"));
	return os.str();
}

std::set<std::string> Server::getPlayerEffectivePrivs(const std::string &name)
{
	std::set<std::string> privs;
	m_script->getAuth(name, NULL, &privs);
	return privs;
}

bool Server::checkPriv(const std::string &name, const std::string &priv)
{
	std::set<std::string> privs = getPlayerEffectivePrivs(name);
	return (privs.count(priv) != 0);
}

void Server::reportPrivsModified(const std::string &name)
{
	if(name == ""){
		std::list<u16> clients = m_clients.getClientIDs();
		for(std::list<u16>::iterator
				i = clients.begin();
				i != clients.end(); ++i){
			Player *player = m_env->getPlayer(*i);
			reportPrivsModified(player->getName());
		}
	} else {
		Player *player = m_env->getPlayer(name.c_str());
		if(!player)
			return;
		SendPlayerPrivileges(player->peer_id);
		PlayerSAO *sao = player->getPlayerSAO();
		if(!sao)
			return;
		sao->updatePrivileges(
				getPlayerEffectivePrivs(name),
				isSingleplayer());
	}
}

void Server::reportInventoryFormspecModified(const std::string &name)
{
	Player *player = m_env->getPlayer(name.c_str());
	if(!player)
		return;
	SendPlayerInventoryFormspec(player->peer_id);
}

void Server::setIpBanned(const std::string &ip, const std::string &name)
{
	m_banmanager->add(ip, name);
}

void Server::unsetIpBanned(const std::string &ip_or_name)
{
	m_banmanager->remove(ip_or_name);
}

std::string Server::getBanDescription(const std::string &ip_or_name)
{
	return m_banmanager->getBanDescription(ip_or_name);
}

void Server::notifyPlayer(const char *name, const std::wstring &msg)
{
	Player *player = m_env->getPlayer(name);
	if(!player)
		return;

	if (player->peer_id == PEER_ID_INEXISTENT)
		return;

	SendChatMessage(player->peer_id, msg);
}

bool Server::showFormspec(const char *playername, const std::string &formspec, const std::string &formname)
{
	Player *player = m_env->getPlayer(playername);

	if(!player)
	{
		infostream<<"showFormspec: couldn't find player:"<<playername<<std::endl;
		return false;
	}

	SendShowFormspecMessage(player->peer_id, formspec, formname);
	return true;
}

u32 Server::hudAdd(Player *player, HudElement *form) {
	if (!player)
		return -1;
	
	u32 id = player->addHud(form);

	SendHUDAdd(player->peer_id, id, form);

	return id;
}

bool Server::hudRemove(Player *player, u32 id) {
	if (!player)
		return false;

	HudElement* todel = player->removeHud(id);

	if (!todel)
		return false;
	
	delete todel;

	SendHUDRemove(player->peer_id, id);
	return true;
}

bool Server::hudChange(Player *player, u32 id, HudElementStat stat, void *data) {
	if (!player)
		return false;

	SendHUDChange(player->peer_id, id, stat, data);
	return true;
}

bool Server::hudSetFlags(Player *player, u32 flags, u32 mask) {
	if (!player)
		return false;

	SendHUDSetFlags(player->peer_id, flags, mask);
	player->hud_flags = flags;
	
	PlayerSAO* playersao = player->getPlayerSAO();
	
	if (playersao == NULL)
		return false;

	m_script->player_event(playersao, "hud_changed");
	return true;
}

bool Server::hudSetHotbarItemcount(Player *player, s32 hotbar_itemcount) {
	if (!player)
		return false;
	if (hotbar_itemcount <= 0 || hotbar_itemcount > HUD_HOTBAR_ITEMCOUNT_MAX)
		return false;

	std::ostringstream os(std::ios::binary);
	writeS32(os, hotbar_itemcount);
	SendHUDSetParam(player->peer_id, HUD_PARAM_HOTBAR_ITEMCOUNT, os.str());
	return true;
}

void Server::hudSetHotbarImage(Player *player, std::string name) {
	if (!player)
		return;

	SendHUDSetParam(player->peer_id, HUD_PARAM_HOTBAR_IMAGE, name);
}

void Server::hudSetHotbarSelectedImage(Player *player, std::string name) {
	if (!player)
		return;

	SendHUDSetParam(player->peer_id, HUD_PARAM_HOTBAR_SELECTED_IMAGE, name);
}

bool Server::setLocalPlayerAnimations(Player *player, v2s32 animation_frames[4], f32 frame_speed)
{
	if (!player)
		return false;

	SendLocalPlayerAnimations(player->peer_id, animation_frames, frame_speed);
	return true;
}

bool Server::setPlayerEyeOffset(Player *player, v3f first, v3f third)
{
	if (!player)
		return false;

	SendEyeOffset(player->peer_id, first, third);
	return true;
}

bool Server::setSky(Player *player, const video::SColor &bgcolor,
		const std::string &type, const std::vector<std::string> &params)
{
	if (!player)
		return false;

	SendSetSky(player->peer_id, bgcolor, type, params);
	return true;
}

bool Server::overrideDayNightRatio(Player *player, bool do_override,
		float ratio)
{
	if (!player)
		return false;

	SendOverrideDayNightRatio(player->peer_id, do_override, ratio);
	return true;
}

void Server::notifyPlayers(const std::wstring &msg)
{
	SendChatMessage(PEER_ID_INEXISTENT,msg);
}

void Server::spawnParticle(const char *playername, v3f pos,
		v3f velocity, v3f acceleration,
		float expirationtime, float size, bool
		collisiondetection, bool vertical, std::string texture)
{
	Player *player = m_env->getPlayer(playername);
	if(!player)
		return;
	SendSpawnParticle(player->peer_id, pos, velocity, acceleration,
			expirationtime, size, collisiondetection, vertical, texture);
}

void Server::spawnParticleAll(v3f pos, v3f velocity, v3f acceleration,
		float expirationtime, float size,
		bool collisiondetection, bool vertical, std::string texture)
{
	SendSpawnParticle(PEER_ID_INEXISTENT,pos, velocity, acceleration,
			expirationtime, size, collisiondetection, vertical, texture);
}

u32 Server::addParticleSpawner(const char *playername,
		u16 amount, float spawntime,
		v3f minpos, v3f maxpos,
		v3f minvel, v3f maxvel,
		v3f minacc, v3f maxacc,
		float minexptime, float maxexptime,
		float minsize, float maxsize,
		bool collisiondetection, bool vertical, std::string texture)
{
	Player *player = m_env->getPlayer(playername);
	if(!player)
		return -1;

	u32 id = 0;
	for(;;) // look for unused particlespawner id
	{
		id++;
		if (std::find(m_particlespawner_ids.begin(),
				m_particlespawner_ids.end(), id)
				== m_particlespawner_ids.end())
		{
			m_particlespawner_ids.push_back(id);
			break;
		}
	}

	SendAddParticleSpawner(player->peer_id, amount, spawntime,
		minpos, maxpos, minvel, maxvel, minacc, maxacc,
		minexptime, maxexptime, minsize, maxsize,
		collisiondetection, vertical, texture, id);

	return id;
}

u32 Server::addParticleSpawnerAll(u16 amount, float spawntime,
		v3f minpos, v3f maxpos,
		v3f minvel, v3f maxvel,
		v3f minacc, v3f maxacc,
		float minexptime, float maxexptime,
		float minsize, float maxsize,
		bool collisiondetection, bool vertical, std::string texture)
{
	u32 id = 0;
	for(;;) // look for unused particlespawner id
	{
		id++;
		if (std::find(m_particlespawner_ids.begin(),
				m_particlespawner_ids.end(), id)
				== m_particlespawner_ids.end())
		{
			m_particlespawner_ids.push_back(id);
			break;
		}
	}

	SendAddParticleSpawner(PEER_ID_INEXISTENT, amount, spawntime,
		minpos, maxpos, minvel, maxvel, minacc, maxacc,
		minexptime, maxexptime, minsize, maxsize,
		collisiondetection, vertical, texture, id);

	return id;
}

void Server::deleteParticleSpawner(const char *playername, u32 id)
{
	Player *player = m_env->getPlayer(playername);
	if(!player)
		return;

	m_particlespawner_ids.erase(
			std::remove(m_particlespawner_ids.begin(),
			m_particlespawner_ids.end(), id),
			m_particlespawner_ids.end());
	SendDeleteParticleSpawner(player->peer_id, id);
}

void Server::deleteParticleSpawnerAll(u32 id)
{
	m_particlespawner_ids.erase(
			std::remove(m_particlespawner_ids.begin(),
			m_particlespawner_ids.end(), id),
			m_particlespawner_ids.end());
	SendDeleteParticleSpawner(PEER_ID_INEXISTENT, id);
}

Inventory* Server::createDetachedInventory(const std::string &name)
{
	if(m_detached_inventories.count(name) > 0){
		infostream<<"Server clearing detached inventory \""<<name<<"\""<<std::endl;
		delete m_detached_inventories[name];
	} else {
		infostream<<"Server creating detached inventory \""<<name<<"\""<<std::endl;
	}
	Inventory *inv = new Inventory(m_itemdef);
	assert(inv);
	m_detached_inventories[name] = inv;
	//TODO find a better way to do this
	sendDetachedInventory(name,PEER_ID_INEXISTENT);
	return inv;
}

class BoolScopeSet
{
public:
	BoolScopeSet(bool *dst, bool val):
		m_dst(dst)
	{
		m_orig_state = *m_dst;
		*m_dst = val;
	}
	~BoolScopeSet()
	{
		*m_dst = m_orig_state;
	}
private:
	bool *m_dst;
	bool m_orig_state;
};

// actions: time-reversed list
// Return value: success/failure
bool Server::rollbackRevertActions(const std::list<RollbackAction> &actions,
		std::list<std::string> *log)
{
	infostream<<"Server::rollbackRevertActions(len="<<actions.size()<<")"<<std::endl;
	ServerMap *map = (ServerMap*)(&m_env->getMap());

	// Fail if no actions to handle
	if(actions.empty()){
		log->push_back("Nothing to do.");
		return false;
	}

	int num_tried = 0;
	int num_failed = 0;

	for(std::list<RollbackAction>::const_iterator
			i = actions.begin();
			i != actions.end(); i++)
	{
		const RollbackAction &action = *i;
		num_tried++;
		bool success = action.applyRevert(map, this, this);
		if(!success){
			num_failed++;
			std::ostringstream os;
			os<<"Revert of step ("<<num_tried<<") "<<action.toString()<<" failed";
			infostream<<"Map::rollbackRevertActions(): "<<os.str()<<std::endl;
			if(log)
				log->push_back(os.str());
		}else{
			std::ostringstream os;
			os<<"Successfully reverted step ("<<num_tried<<") "<<action.toString();
			infostream<<"Map::rollbackRevertActions(): "<<os.str()<<std::endl;
			if(log)
				log->push_back(os.str());
		}
	}

	infostream<<"Map::rollbackRevertActions(): "<<num_failed<<"/"<<num_tried
			<<" failed"<<std::endl;

	// Call it done if less than half failed
	return num_failed <= num_tried/2;
}

// IGameDef interface
// Under envlock
IItemDefManager* Server::getItemDefManager()
{
	return m_itemdef;
}
INodeDefManager* Server::getNodeDefManager()
{
	return m_nodedef;
}
ICraftDefManager* Server::getCraftDefManager()
{
	return m_craftdef;
}
ITextureSource* Server::getTextureSource()
{
	return NULL;
}
IShaderSource* Server::getShaderSource()
{
	return NULL;
}
scene::ISceneManager* Server::getSceneManager()
{
	return NULL;
}

u16 Server::allocateUnknownNodeId(const std::string &name)
{
	return m_nodedef->allocateDummy(name);
}
ISoundManager* Server::getSoundManager()
{
	return &dummySoundManager;
}
MtEventManager* Server::getEventManager()
{
	return m_event;
}

IWritableItemDefManager* Server::getWritableItemDefManager()
{
	return m_itemdef;
}
IWritableNodeDefManager* Server::getWritableNodeDefManager()
{
	return m_nodedef;
}
IWritableCraftDefManager* Server::getWritableCraftDefManager()
{
	return m_craftdef;
}

const ModSpec* Server::getModSpec(const std::string &modname)
{
	for(std::vector<ModSpec>::iterator i = m_mods.begin();
			i != m_mods.end(); i++){
		const ModSpec &mod = *i;
		if(mod.name == modname)
			return &mod;
	}
	return NULL;
}
void Server::getModNames(std::list<std::string> &modlist)
{
	for(std::vector<ModSpec>::iterator i = m_mods.begin(); i != m_mods.end(); i++)
	{
		modlist.push_back(i->name);
	}
}
std::string Server::getBuiltinLuaPath()
{
	return porting::path_share + DIR_DELIM + "builtin";
}

v3f findSpawnPos(ServerMap &map)
{
	//return v3f(50,50,50)*BS;

	v3s16 nodepos;

#if 0
	nodepos = v2s16(0,0);
	groundheight = 20;
#endif

#if 1
	s16 water_level = map.getWaterLevel();

	// Try to find a good place a few times
	for(s32 i=0; i<1000; i++)
	{
		s32 range = 1 + i;
		// We're going to try to throw the player to this position
		v2s16 nodepos2d = v2s16(
				-range + (myrand() % (range * 2)),
				-range + (myrand() % (range * 2)));

		// Get ground height at point
		s16 groundheight = map.findGroundLevel(nodepos2d);
		if (groundheight <= water_level) // Don't go underwater
			continue;
		if (groundheight > water_level + 6) // Don't go to high places
			continue;

		nodepos = v3s16(nodepos2d.X, groundheight, nodepos2d.Y);
		bool is_good = false;
		s32 air_count = 0;
		for (s32 i = 0; i < 10; i++) {
			v3s16 blockpos = getNodeBlockPos(nodepos);
			map.emergeBlock(blockpos, true);
			content_t c = map.getNodeNoEx(nodepos).getContent();
			if (c == CONTENT_AIR || c == CONTENT_IGNORE) {
				air_count++;
				if (air_count >= 2){
					is_good = true;
					break;
				}
			}
			nodepos.Y++;
		}
		if(is_good){
			// Found a good place
			//infostream<<"Searched through "<<i<<" places."<<std::endl;
			break;
		}
	}
#endif

	return intToFloat(nodepos, BS);
}

PlayerSAO* Server::emergePlayer(const char *name, u16 peer_id)
{
	RemotePlayer *player = NULL;
	bool newplayer = false;

	/*
		Try to get an existing player
	*/
	player = static_cast<RemotePlayer*>(m_env->getPlayer(name));

	// If player is already connected, cancel
	if(player != NULL && player->peer_id != 0)
	{
		infostream<<"emergePlayer(): Player already connected"<<std::endl;
		return NULL;
	}

	/*
		If player with the wanted peer_id already exists, cancel.
	*/
	if(m_env->getPlayer(peer_id) != NULL)
	{
		infostream<<"emergePlayer(): Player with wrong name but same"
				" peer_id already exists"<<std::endl;
		return NULL;
	}

	// Load player if it isn't already loaded
	if (!player) {
		player = static_cast<RemotePlayer*>(m_env->loadPlayer(name));
	}

	// Create player if it doesn't exist
	if (!player) {
		newplayer = true;
		player = new RemotePlayer(this, name);
		// Set player position
		infostream<<"Server: Finding spawn place for player \""
				<<name<<"\""<<std::endl;
		v3f pos = findSpawnPos(m_env->getServerMap());
		player->setPosition(pos);

		// Make sure the player is saved
		player->setModified(true);

		// Add player to environment
		m_env->addPlayer(player);
	}

	// Create a new player active object
	PlayerSAO *playersao = new PlayerSAO(m_env, player, peer_id,
			getPlayerEffectivePrivs(player->getName()),
			isSingleplayer());

	/* Clean up old HUD elements from previous sessions */
	player->clearHud();

	/* Add object to environment */
	m_env->addActiveObject(playersao);

	/* Run scripts */
	if (newplayer) {
		m_script->on_newplayer(playersao);
	}

	return playersao;
}

void dedicated_server_loop(Server &server, bool &kill)
{
	DSTACK(__FUNCTION_NAME);

	verbosestream<<"dedicated_server_loop()"<<std::endl;

	IntervalLimiter m_profiler_interval;

	for(;;)
	{
		float steplen = g_settings->getFloat("dedicated_server_step");
		// This is kind of a hack but can be done like this
		// because server.step() is very light
		{
			ScopeProfiler sp(g_profiler, "dedicated server sleep");
			sleep_ms((int)(steplen*1000.0));
		}
		server.step(steplen);

		if(server.getShutdownRequested() || kill)
		{
			infostream<<"Dedicated server quitting"<<std::endl;
#if USE_CURL
			if(g_settings->getBool("server_announce") == true)
				ServerList::sendAnnounce("delete");
#endif
			break;
		}

		/*
			Profiler
		*/
		float profiler_print_interval =
				g_settings->getFloat("profiler_print_interval");
		if(profiler_print_interval != 0)
		{
			if(m_profiler_interval.step(steplen, profiler_print_interval))
			{
				infostream<<"Profiler:"<<std::endl;
				g_profiler->print(infostream);
				g_profiler->clear();
			}
		}
	}
}