serverpackethandler.cpp

/*
Minetest
Copyright (C) 2015 nerzhul, Loic Blot <loic.blot@unix-experience.fr>

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 "log.h"

#include "content_abm.h"
#include "content_sao.h"
#include "emerge.h"
#include "main.h"
#include "nodedef.h"
#include "player.h"
#include "rollback_interface.h"
#include "scripting_game.h"
#include "settings.h"
#include "tool.h"
#include "version.h"
#include "network/networkprotocol.h"
#include "network/serveropcodes.h"
#include "util/base64.h"
#include "util/pointedthing.h"
#include "util/serialize.h"

void Server::handleCommand_Deprecated(NetworkPacket* pkt)
{
	infostream << "Server: " << toServerCommandTable[pkt->getCommand()].name
		<< " not supported anymore" << std::endl;
}

void Server::handleCommand_Init(NetworkPacket* pkt)
{

	if(pkt->getSize() < 1)
		return;

	RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);

	std::string addr_s;
	try {
		Address address = getPeerAddress(pkt->getPeerId());
		addr_s = address.serializeString();
	}
	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(): Canceling: peer "
				<< pkt->getPeerId() << " not found" << std::endl;
		return;
	}

	// 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=" << pkt->getPeerId() << ")" << std::endl;
		return;
	}

	verbosestream << "Server: Got TOSERVER_INIT from " << addr_s << " (peer_id="
			<< pkt->getPeerId() << ")" << 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(pkt->getPeerId(), SERVER_ACCESSDENIED_SINGLEPLAYER);
		return;
	}

	// First byte after command is maximum supported
	// serialization version
	u8 client_max;
	u8 compression_modes;
	u16 min_net_proto_version = 0;
	u16 max_net_proto_version;

	*pkt >> client_max >> compression_modes >> min_net_proto_version
			>> max_net_proto_version;

	u8 our_max = SER_FMT_VER_HIGHEST_READ;
	// Use the highest version supported by both
	int 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(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
		return;
	}

	client->setPendingSerializationVersion(deployed);

	/*
		Read and check network protocol version
	*/

	u16 net_proto_version = 0;

	// 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;

	// On this handler protocol version 25 is required
	if (net_proto_version < 25 ||
			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(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_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(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
			return;
		}
	}

	// @TODO: check if we support same modes, but not required now

	client->setSupportedCompressionModes(compression_modes);

	m_clients.event(pkt->getPeerId(), CSE_Init);
}

void Server::handleCommand_Auth(NetworkPacket* pkt)
{
	std::string addr_s;
	try {
		Address address = getPeerAddress(pkt->getPeerId());
		addr_s = address.serializeString();
	}
	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(): Canceling: peer "
				<< pkt->getPeerId() << " not found" << std::endl;
		return;
	}

	std::string playerName, playerPassword;

	*pkt >> playerName >> playerPassword;

	const char* playername = playerName.c_str();

	if (playerName.size() > PLAYERNAME_SIZE) {
		actionstream << "Server: Player with an too long name "
				<< "tried to connect from " << addr_s << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_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(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME);
		return;
	}

	if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
		actionstream << "Server: Player with the name \"singleplayer\" "
				<< "tried to connect from " << addr_s << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME);
		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(pkt->getPeerId(), SERVER_ACCESSDENIED_CUSTOM_STRING,
					narrow_to_wide(reason.c_str()));
			return;
		}
	}

	if (playerPassword.size() > PASSWORD_SIZE) {
		actionstream << "Server: Player with an too long password "
				<< "tried to connect from " << addr_s << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD);
		return;
	}

	infostream << "Server: New connection: \"" << playerName << "\" from "
			<< addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;

	if(!base64_is_valid(playerPassword)){
		actionstream << "Server: " << playerName
				<< " supplied invalid password hash" << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD);
		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(pkt->getPeerId(), SERVER_ACCESSDENIED_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") &&
				playerPassword.empty()) {
			actionstream << "Server: " << playerName
					<< " supplied empty password" << std::endl;
			DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_EMPTY_PASSWORD);
			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 = playerPassword.c_str();

		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(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
		return;
	}

	if(playerPassword.c_str() != checkpwd) {
		actionstream << "Server: " << playerName << " supplied wrong password"
				<< std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_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(pkt->getPeerId(), SERVER_ACCESSDENIED_ALREADY_CONNECTED);
	}

	m_clients.setPlayerName(pkt->getPeerId(), playername);

	/*
		Answer with a TOCLIENT_INIT
	*/

	NetworkPacket resp_pkt(TOCLIENT_AUTH_ACCEPT, 1 + 6 + 8 + 4, pkt->getPeerId());

	resp_pkt << v3f(0,0,0) << (u64) m_env->getServerMap().getSeed()
			<< g_settings->getFloat("dedicated_server_step");

	Send(&resp_pkt);
	m_clients.event(pkt->getPeerId(), CSE_Init);
}

void Server::handleCommand_Init_Legacy(NetworkPacket* pkt)
{
	// [0] u8 SER_FMT_VER_HIGHEST_READ
	// [1] u8[20] player_name
	// [21] u8[28] password <--- can be sent without this, from old versions

	if (pkt->getSize() < 1+PLAYERNAME_SIZE)
		return;

	RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);

	std::string addr_s;
	try {
		Address address = getPeerAddress(pkt->getPeerId());
		addr_s = address.serializeString();
	}
	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(): Canceling: peer "
				<< pkt->getPeerId() << " not found" << std::endl;
		return;
	}

	// 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=" << pkt->getPeerId() << ")" << std::endl;
		return;
	}

	verbosestream << "Server: Got TOSERVER_INIT from " << addr_s << " (peer_id="
			<< pkt->getPeerId() << ")" << 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_Legacy(pkt->getPeerId(), L"Running in simple singleplayer mode.");
		return;
	}

	// First byte after command is maximum supported
	// serialization version
	u8 client_max;

	*pkt >> client_max;

	u8 our_max = SER_FMT_VER_HIGHEST_READ;
	// Use the highest version supported by both
	int 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_Legacy(pkt->getPeerId(), 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 (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2)
		min_net_proto_version = pkt->getU16(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 (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2 + 2)
		max_net_proto_version = pkt->getU16(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_Legacy(pkt->getPeerId(), 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_Legacy(pkt->getPeerId(), 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] = pkt->getChar(1+playername_length);
		if (pkt->getChar(1+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_Legacy(pkt->getPeerId(), 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_Legacy(pkt->getPeerId(), 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_Legacy(pkt->getPeerId(), 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_Legacy(pkt->getPeerId(), 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_Legacy(pkt->getPeerId(), narrow_to_wide(reason.c_str()));
			return;
		}
	}

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

	// Get password
	char given_password[PASSWORD_SIZE];
	if (pkt->getSize() < 1 + PLAYERNAME_SIZE + PASSWORD_SIZE) {
		// old version - assume blank password
		given_password[0] = 0;
	}
	else {
		for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
			given_password[i] = pkt->getChar(21 + i);
		}
		given_password[PASSWORD_SIZE - 1] = 0;
	}

	if (!base64_is_valid(given_password)) {
		actionstream << "Server: " << playername
				<< " supplied invalid password hash" << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), 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_Legacy(pkt->getPeerId(), 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_Legacy(pkt->getPeerId(), 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_Legacy(pkt->getPeerId(), L"Not allowed to login");
		return;
	}

	if (given_password != checkpwd) {
		actionstream << "Server: " << playername << " supplied wrong password"
				<< std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), 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_Legacy(pkt->getPeerId(), L"Another client is connected with this "
				L"name. If your client closed unexpectedly, try again in "
				L"a minute.");
	}

	m_clients.setPlayerName(pkt->getPeerId(), playername);

	/*
		Answer with a TOCLIENT_INIT
	*/

	NetworkPacket resp_pkt(TOCLIENT_INIT_LEGACY, 1 + 6 + 8 + 4,
			pkt->getPeerId());

	resp_pkt << (u8) deployed << (v3s16) floatToInt(v3f(0,0,0), BS)
			<< (u64) m_env->getServerMap().getSeed()
			<< g_settings->getFloat("dedicated_server_step");

	Send(&resp_pkt);
	m_clients.event(pkt->getPeerId(), CSE_Init);
}

void Server::handleCommand_Init2(NetworkPacket* pkt)
{
	verbosestream << "Server: Got TOSERVER_INIT2 from "
			<< pkt->getPeerId() << std::endl;

	m_clients.event(pkt->getPeerId(), CSE_GotInit2);
	u16 protocol_version = m_clients.getProtocolVersion(pkt->getPeerId());


	///// begin compatibility code
	PlayerSAO* playersao = NULL;
	if (protocol_version <= 22) {
		playersao = StageTwoClientInit(pkt->getPeerId());

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

	/*
		Send some initialization data
	*/

	infostream << "Server: Sending content to "
			<< getPlayerName(pkt->getPeerId()) << std::endl;

	// Send player movement settings
	SendMovement(pkt->getPeerId());

	// Send item definitions
	SendItemDef(pkt->getPeerId(), m_itemdef, protocol_version);

	// Send node definitions
	SendNodeDef(pkt->getPeerId(), m_nodedef, protocol_version);

	m_clients.event(pkt->getPeerId(), CSE_SetDefinitionsSent);

	// Send media announcement
	sendMediaAnnouncement(pkt->getPeerId());

	// Send detached inventories
	sendDetachedInventories(pkt->getPeerId());

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

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

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

void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
{
	std::vector<std::string> tosend;
	u16 numfiles;

	*pkt >> numfiles;

	infostream << "Sending " << numfiles << " files to "
			<< getPlayerName(pkt->getPeerId()) << std::endl;
	verbosestream << "TOSERVER_REQUEST_MEDIA: " << std::endl;

	for (u16 i = 0; i < numfiles; i++) {
		std::string name;

		*pkt >> name;

		tosend.push_back(name);
		verbosestream << "TOSERVER_REQUEST_MEDIA: requested file "
				<< name << std::endl;
	}

	sendRequestedMedia(pkt->getPeerId(), tosend);
}

void Server::handleCommand_ReceivedMedia(NetworkPacket* pkt)
{
}

void Server::handleCommand_ClientReady(NetworkPacket* pkt)
{
	u16 peer_id = pkt->getPeerId();
	u16 peer_proto_ver = getClient(peer_id, CS_InitDone)->net_proto_version;

	// 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,"
			<< "disconnecting 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 (pkt->getSize() < 8) {
		errorstream
			<< "TOSERVER_CLIENT_READY client sent inconsistent data, disconnecting peer_id: "
			<< peer_id << std::endl;
		m_con.DisconnectPeer(peer_id);
		return;
	}

	u8 major_ver, minor_ver, patch_ver, reserved;
	std::string full_ver;
	*pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;

	m_clients.setClientVersion(
			peer_id, major_ver, minor_ver, patch_ver,
			full_ver);

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

void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
{
	if (pkt->getSize() < 1)
		return;

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

	u8 count;
	*pkt >> count;

	RemoteClient *client = getClient(pkt->getPeerId());

	for (u16 i = 0; i < count; i++) {
		if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
			throw con::InvalidIncomingDataException
				("GOTBLOCKS length is too short");
		v3s16 p;

		*pkt >> p;

		client->GotBlock(p);
	}
}

void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
{
	if (pkt->getSize() < 12 + 12 + 4 + 4)
		return;

	v3s32 ps, ss;
	s32 f32pitch, f32yaw;

	*pkt >> ps;
	*pkt >> ss;
	*pkt >> f32pitch;
	*pkt >> f32yaw;

	f32 pitch = (f32)f32pitch / 100.0;
	f32 yaw = (f32)f32yaw / 100.0;
	u32 keyPressed = 0;

	if (pkt->getSize() >= 12 + 12 + 4 + 4 + 4)
		*pkt >> keyPressed;

	v3f position((f32)ps.X / 100.0, (f32)ps.Y / 100.0, (f32)ps.Z / 100.0);
	v3f speed((f32)ss.X / 100.0, (f32)ss.Y / 100.0, (f32)ss.Z / 100.0);

	pitch = modulo360f(pitch);
	yaw = modulo360f(yaw);

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

	// If player is dead we don't care of this packet
	if (player->isDead()) {
		verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
			<< " is dead. Ignoring packet";
		return;
	}

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

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

	if (playersao->checkMovementCheat()) {
		// Call callbacks
		m_script->on_cheat(playersao, "moved_too_fast");
		SendMovePlayer(pkt->getPeerId());
	}
}

void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
{
	if (pkt->getSize() < 1)
		return;

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

	u8 count;
	*pkt >> count;

	RemoteClient *client = getClient(pkt->getPeerId());

	for (u16 i = 0; i < count; i++) {
		if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
			throw con::InvalidIncomingDataException
				("DELETEDBLOCKS length is too short");
		v3s16 p;
		*pkt >> p;

		client->SetBlockNotSent(p);
	}
}

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

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

	// Strip command and create a stream
	std::string datastring(pkt->getString(0), pkt->getSize());
	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;
		}
	}