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serverpackethandler.cpp
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serverpackethandler.cpp
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/*
Minetest
Copyright (C) 2015 nerzhul, Loic Blot <[email protected]>
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 "chatmessage.h"
#include "server.h"
#include "log.h"
#include "emerge.h"
#include "mapblock.h"
#include "modchannels.h"
#include "nodedef.h"
#include "remoteplayer.h"
#include "rollback_interface.h"
#include "scripting_server.h"
#include "settings.h"
#include "tool.h"
#include "version.h"
#include "network/connection.h"
#include "network/networkprotocol.h"
#include "network/serveropcodes.h"
#include "server/player_sao.h"
#include "server/serverinventorymgr.h"
#include "util/auth.h"
#include "util/base64.h"
#include "util/pointedthing.h"
#include "util/serialize.h"
#include "util/srp.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;
session_t peer_id = pkt->getPeerId();
RemoteClient *client = getClient(peer_id, CS_Created);
Address addr;
std::string addr_s;
try {
addr = m_con->GetPeerAddress(peer_id);
addr_s = addr.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 " << peer_id <<
" not found" << std::endl;
return;
}
if (client->getState() > CS_Created) {
verbosestream << "Server: Ignoring multiple TOSERVER_INITs from " <<
addr_s << " (peer_id=" << peer_id << ")" << std::endl;
return;
}
client->setCachedAddress(addr);
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().empty()) {
infostream << "Server: Not allowing another client (" << addr_s <<
") to connect in simple singleplayer mode" << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_SINGLEPLAYER);
return;
}
// First byte after command is maximum supported
// serialization version
u8 client_max;
u16 supp_compr_modes;
u16 min_net_proto_version = 0;
u16 max_net_proto_version;
std::string playerName;
*pkt >> client_max >> supp_compr_modes >> min_net_proto_version
>> max_net_proto_version >> playerName;
u8 our_max = SER_FMT_VER_HIGHEST_READ;
// Use the highest version supported by both
u8 depl_serial_v = std::min(client_max, our_max);
// If it's lower than the lowest supported, give up.
#if SER_FMT_VER_LOWEST_READ > 0
if (depl_serial_v < SER_FMT_VER_LOWEST_READ)
depl_serial_v = SER_FMT_VER_INVALID;
#endif
if (depl_serial_v == SER_FMT_VER_INVALID) {
actionstream << "Server: A mismatched client tried to connect from " <<
addr_s << " ser_fmt_max=" << (int)client_max << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_VERSION);
return;
}
client->setPendingSerializationVersion(depl_serial_v);
/*
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;
if ((g_settings->getBool("strict_protocol_version_checking") &&
net_proto_version != LATEST_PROTOCOL_VERSION) ||
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 << " proto_max=" << (int)max_net_proto_version << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_VERSION);
return;
}
/*
Validate player name
*/
const char* playername = playerName.c_str();
size_t pns = playerName.size();
if (pns == 0 || pns > PLAYERNAME_SIZE) {
actionstream << "Server: Player with " <<
((pns > PLAYERNAME_SIZE) ? "a too long" : "an empty") <<
" name tried to connect from " << addr_s << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_NAME);
return;
}
if (!string_allowed(playerName, PLAYERNAME_ALLOWED_CHARS)) {
actionstream << "Server: Player with an invalid name tried to connect "
"from " << addr_s << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME);
return;
}
RemotePlayer *player = m_env->getPlayer(playername);
// If player is already connected, cancel
if (player && player->getPeerId() != PEER_ID_INEXISTENT) {
actionstream << "Server: Player with name \"" << playername <<
"\" tried to connect, but player with same name is already connected" << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_ALREADY_CONNECTED);
return;
}
m_clients.setPlayerName(peer_id, playername);
//TODO (later) case insensitivity
std::string legacyPlayerNameCasing = playerName;
if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
actionstream << "Server: Player with the name \"singleplayer\" tried "
"to connect from " << addr_s << std::endl;
DenyAccess(peer_id, 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(peer_id, SERVER_ACCESSDENIED_CUSTOM_STRING, reason);
return;
}
}
infostream << "Server: New connection: \"" << playerName << "\" from " <<
addr_s << " (peer_id=" << peer_id << ")" << std::endl;
// Enforce user limit.
// Don't enforce for users that have some admin right or mod permits it.
if (m_clients.isUserLimitReached() &&
playername != g_settings->get("name") &&
!m_script->can_bypass_userlimit(playername, addr_s)) {
actionstream << "Server: " << playername << " tried to join from " <<
addr_s << ", but there are already max_users=" <<
g_settings->getU16("max_users") << " players." << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_TOO_MANY_USERS);
return;
}
/*
Compose auth methods for answer
*/
std::string encpwd; // encrypted Password field for the user
bool has_auth = m_script->getAuth(playername, &encpwd, nullptr);
u32 auth_mechs = 0;
client->chosen_mech = AUTH_MECHANISM_NONE;
if (has_auth) {
std::vector<std::string> pwd_components = str_split(encpwd, '#');
if (pwd_components.size() == 4) {
if (pwd_components[1] == "1") { // 1 means srp
auth_mechs |= AUTH_MECHANISM_SRP;
client->enc_pwd = encpwd;
} else {
actionstream << "User " << playername << " tried to log in, "
"but password field was invalid (unknown mechcode)." <<
std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
return;
}
} else if (base64_is_valid(encpwd)) {
auth_mechs |= AUTH_MECHANISM_LEGACY_PASSWORD;
client->enc_pwd = encpwd;
} else {
actionstream << "User " << playername << " tried to log in, but "
"password field was invalid (invalid base64)." << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
return;
}
} else {
std::string default_password = g_settings->get("default_password");
if (default_password.length() == 0) {
auth_mechs |= AUTH_MECHANISM_FIRST_SRP;
} else {
// Take care of default passwords.
client->enc_pwd = get_encoded_srp_verifier(playerName, default_password);
auth_mechs |= AUTH_MECHANISM_SRP;
// Allocate player in db, but only on successful login.
client->create_player_on_auth_success = true;
}
}
/*
Answer with a TOCLIENT_HELLO
*/
verbosestream << "Sending TOCLIENT_HELLO with auth method field: "
<< auth_mechs << std::endl;
NetworkPacket resp_pkt(TOCLIENT_HELLO,
1 + 4 + legacyPlayerNameCasing.size(), peer_id);
u16 depl_compress_mode = NETPROTO_COMPRESSION_NONE;
resp_pkt << depl_serial_v << depl_compress_mode << net_proto_version
<< auth_mechs << legacyPlayerNameCasing;
Send(&resp_pkt);
client->allowed_auth_mechs = auth_mechs;
client->setDeployedCompressionMode(depl_compress_mode);
m_clients.event(peer_id, CSE_Hello);
}
void Server::handleCommand_Init2(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
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);
std::string lang;
if (pkt->getSize() > 0)
*pkt >> lang;
/*
Send some initialization data
*/
infostream << "Server: Sending content to " << getPlayerName(peer_id) <<
std::endl;
// 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, lang);
RemoteClient *client = getClient(peer_id, CS_InitDone);
// Keep client language for server translations
client->setLangCode(lang);
// Send active objects
{
PlayerSAO *sao = getPlayerSAO(peer_id);
if (sao)
SendActiveObjectRemoveAdd(client, sao);
}
// Send detached inventories
sendDetachedInventories(peer_id, false);
// Send player movement settings
SendMovement(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);
SendCSMRestrictionFlags(peer_id);
// Warnings about protocol version can be issued here
if (client->net_proto_version < LATEST_PROTOCOL_VERSION) {
SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
L"# Server: WARNING: YOUR CLIENT'S VERSION MAY NOT BE FULLY COMPATIBLE "
L"WITH THIS SERVER!"));
}
}
void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
{
std::vector<std::string> tosend;
u16 numfiles;
*pkt >> numfiles;
session_t peer_id = pkt->getPeerId();
infostream << "Sending " << numfiles << " files to " <<
getPlayerName(peer_id) << std::endl;
verbosestream << "TOSERVER_REQUEST_MEDIA: requested file(s)" << std::endl;
for (u16 i = 0; i < numfiles; i++) {
std::string name;
*pkt >> name;
tosend.emplace_back(name);
verbosestream << " " << name << std::endl;
}
sendRequestedMedia(peer_id, tosend);
}
void Server::handleCommand_ClientReady(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
// decode all information first
u8 major_ver, minor_ver, patch_ver, reserved;
u16 formspec_ver = 1; // v1 for clients older than 5.1.0-dev
std::string full_ver;
*pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;
if (pkt->getRemainingBytes() >= 2)
*pkt >> formspec_ver;
m_clients.setClientVersion(peer_id, major_ver, minor_ver, patch_ver,
full_ver);
// Emerge player
PlayerSAO* playersao = StageTwoClientInit(peer_id);
if (!playersao) {
errorstream << "Server: stage 2 client init failed "
"peer_id=" << peer_id << std::endl;
DisconnectPeer(peer_id);
return;
}
playersao->getPlayer()->formspec_version = formspec_ver;
m_clients.event(peer_id, CSE_SetClientReady);
// Send player list to this client
{
const std::vector<std::string> &players = m_clients.getPlayerNames();
NetworkPacket list_pkt(TOCLIENT_UPDATE_PLAYER_LIST, 0, peer_id);
list_pkt << (u8) PLAYER_LIST_INIT << (u16) players.size();
for (const auto &player : players)
list_pkt << player;
Send(peer_id, &list_pkt);
}
s64 last_login;
m_script->getAuth(playersao->getPlayer()->getName(), nullptr, nullptr, &last_login);
m_script->on_joinplayer(playersao, last_login);
// Send shutdown timer if shutdown has been scheduled
if (m_shutdown_state.isTimerRunning())
SendChatMessage(peer_id, m_shutdown_state.getShutdownTimerMessage());
}
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;
if ((s16)pkt->getSize() < 1 + (int)count * 6) {
throw con::InvalidIncomingDataException
("GOTBLOCKS length is too short");
}
ClientInterface::AutoLock lock(m_clients);
RemoteClient *client = m_clients.lockedGetClientNoEx(pkt->getPeerId());
for (u16 i = 0; i < count; i++) {
v3s16 p;
*pkt >> p;
client->GotBlock(p);
}
}
void Server::process_PlayerPos(RemotePlayer *player, PlayerSAO *playersao,
NetworkPacket *pkt)
{
if (pkt->getRemainingBytes() < 12 + 12 + 4 + 4 + 4 + 1 + 1)
return;
v3s32 ps, ss;
s32 f32pitch, f32yaw;
u8 f32fov;
*pkt >> ps;
*pkt >> ss;
*pkt >> f32pitch;
*pkt >> f32yaw;
f32 pitch = (f32)f32pitch / 100.0f;
f32 yaw = (f32)f32yaw / 100.0f;
u32 keyPressed = 0;
f32 fov = 0;
u8 wanted_range = 0;
*pkt >> keyPressed;
*pkt >> f32fov;
fov = (f32)f32fov / 80.0f;
*pkt >> wanted_range;
v3f position((f32)ps.X / 100.0f, (f32)ps.Y / 100.0f, (f32)ps.Z / 100.0f);
v3f speed((f32)ss.X / 100.0f, (f32)ss.Y / 100.0f, (f32)ss.Z / 100.0f);
pitch = modulo360f(pitch);
yaw = wrapDegrees_0_360(yaw);
if (!playersao->isAttached()) {
// Only update player positions when moving freely
// to not interfere with attachment handling
playersao->setBasePosition(position);
player->setSpeed(speed);
}
playersao->setLookPitch(pitch);
playersao->setPlayerYaw(yaw);
playersao->setFov(fov);
playersao->setWantedRange(wanted_range);
player->control.unpackKeysPressed(keyPressed);
if (playersao->checkMovementCheat()) {
// Call callbacks
m_script->on_cheat(playersao, "moved_too_fast");
SendMovePlayer(pkt->getPeerId());
}
}
void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
// If player is dead we don't care of this packet
if (playersao->isDead()) {
verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
<< " is dead. Ignoring packet";
return;
}
process_PlayerPos(player, playersao, pkt);
}
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());
if ((s16)pkt->getSize() < 1 + (int)count * 6) {
throw con::InvalidIncomingDataException
("DELETEDBLOCKS length is too short");
}
for (u16 i = 0; i < count; i++) {
v3s16 p;
*pkt >> p;
client->SetBlockNotSent(p);
}
}
void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
// 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
std::unique_ptr<InventoryAction> a(InventoryAction::deSerialize(is));
if (!a) {
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.
*/
const bool player_has_interact = checkPriv(player->getName(), "interact");
auto check_inv_access = [player, player_has_interact, this] (
const InventoryLocation &loc) -> bool {
// Players without interact may modify their own inventory
if (!player_has_interact && loc.type != InventoryLocation::PLAYER) {
infostream << "Cannot modify foreign inventory: "
<< "No interact privilege" << std::endl;
return false;
}
switch (loc.type) {
case InventoryLocation::CURRENT_PLAYER:
// Only used internally on the client, never sent
return false;
case InventoryLocation::PLAYER:
// Allow access to own inventory in all cases
return loc.name == player->getName();
case InventoryLocation::NODEMETA:
{
// Check for out-of-range interaction
v3f node_pos = intToFloat(loc.p, BS);
v3f player_pos = player->getPlayerSAO()->getEyePosition();
f32 d = player_pos.getDistanceFrom(node_pos);
return checkInteractDistance(player, d, "inventory");
}
case InventoryLocation::DETACHED:
return getInventoryMgr()->checkDetachedInventoryAccess(loc, player->getName());
default:
return false;
}
};
/*
Handle restrictions and special cases of the move action
*/
if (a->getType() == IAction::Move) {
IMoveAction *ma = (IMoveAction*)a.get();
ma->from_inv.applyCurrentPlayer(player->getName());
ma->to_inv.applyCurrentPlayer(player->getName());
m_inventory_mgr->setInventoryModified(ma->from_inv);
if (ma->from_inv != ma->to_inv)
m_inventory_mgr->setInventoryModified(ma->to_inv);
if (!check_inv_access(ma->from_inv) ||
!check_inv_access(ma->to_inv))
return;
/*
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;
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;
return;
}
}
/*
Handle restrictions and special cases of the drop action
*/
else if (a->getType() == IAction::Drop) {
IDropAction *da = (IDropAction*)a.get();
da->from_inv.applyCurrentPlayer(player->getName());
m_inventory_mgr->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;
return;
}
// Disallow dropping items if not allowed to interact
if (!player_has_interact || !check_inv_access(da->from_inv))
return;
// Disallow dropping items if dead
if (playersao->isDead()) {
infostream << "Ignoring IDropAction from "
<< (da->from_inv.dump()) << ":" << da->from_list
<< " because player is dead." << std::endl;
return;
}
}
/*
Handle restrictions and special cases of the craft action
*/
else if (a->getType() == IAction::Craft) {
ICraftAction *ca = (ICraftAction*)a.get();
ca->craft_inv.applyCurrentPlayer(player->getName());
m_inventory_mgr->setInventoryModified(ca->craft_inv);
// Disallow crafting if not allowed to interact
if (!player_has_interact) {
infostream << "Cannot craft: "
<< "No interact privilege" << std::endl;
return;
}
if (!check_inv_access(ca->craft_inv))
return;
} else {
// Unknown action. Ignored.
return;
}
// Do the action
a->apply(m_inventory_mgr.get(), playersao, this);
}
void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
{
std::wstring message;
*pkt >> message;
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
std::string name = player->getName();
std::wstring answer_to_sender = handleChat(name, message, true, player);
if (!answer_to_sender.empty()) {
// Send the answer to sender
SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
answer_to_sender));
}
}
void Server::handleCommand_Damage(NetworkPacket* pkt)
{
u16 damage;
*pkt >> damage;
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
if (!playersao->isImmortal()) {
if (playersao->isDead()) {
verbosestream << "Server::ProcessData(): Info: "
"Ignoring damage as player " << player->getName()
<< " is already dead." << std::endl;
return;
}
actionstream << player->getName() << " damaged by "
<< (int)damage << " hp at " << PP(playersao->getBasePosition() / BS)
<< std::endl;
PlayerHPChangeReason reason(PlayerHPChangeReason::FALL);
playersao->setHP((s32)playersao->getHP() - (s32)damage, reason, true);
}
}
void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
{
if (pkt->getSize() < 2)
return;
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
u16 item;
*pkt >> item;
if (item >= player->getHotbarItemcount()) {
actionstream << "Player: " << player->getName()
<< " tried to access item=" << item
<< " out of hotbar_itemcount="
<< player->getHotbarItemcount()
<< "; ignoring." << std::endl;
return;
}
playersao->getPlayer()->setWieldIndex(item);
}
void Server::handleCommand_Respawn(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
assert(playersao);
if (!playersao->isDead())
return;
RespawnPlayer(peer_id);
actionstream << player->getName() << " respawns at "
<< PP(playersao->getBasePosition() / BS) << std::endl;
// ActiveObject is added to environment in AsyncRunStep after
// the previous addition has been successfully removed
}
bool Server::checkInteractDistance(RemotePlayer *player, const f32 d, const std::string &what)
{
ItemStack selected_item, hand_item;
player->getWieldedItem(&selected_item, &hand_item);
f32 max_d = BS * getToolRange(selected_item.getDefinition(m_itemdef),
hand_item.getDefinition(m_itemdef));
// Cube diagonal * 1.5 for maximal supported node extents:
// sqrt(3) * 1.5 ≅ 2.6
if (d > max_d + 2.6f * BS) {
actionstream << "Player " << player->getName()
<< " tried to access " << what
<< " from too far: "
<< "d=" << d << ", max_d=" << max_d
<< "; ignoring." << std::endl;
// Call callbacks
m_script->on_cheat(player->getPlayerSAO(), "interacted_too_far");
return false;
}
return true;
}
// Tiny helper to retrieve the selected item into an Optional
static inline void getWieldedItem(const PlayerSAO *playersao, Optional<ItemStack> &ret)
{
ret = ItemStack();
playersao->getWieldedItem(&(*ret));
}
void Server::handleCommand_Interact(NetworkPacket *pkt)
{
/*
[0] u16 command
[2] u8 action
[3] u16 item
[5] u32 length of the next item (plen)
[9] serialized PointedThing
[9 + plen] player position information
*/
InteractAction action;
u16 item_i;
*pkt >> (u8 &)action;
*pkt >> item_i;
std::istringstream tmp_is(pkt->readLongString(), std::ios::binary);
PointedThing pointed;
pointed.deSerialize(tmp_is);
verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
<< item_i << ", pointed=" << pointed.dump() << std::endl;
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
if (playersao->isDead()) {
actionstream << "Server: " << player->getName()
<< " tried to interact while dead; ignoring." << std::endl;
if (pointed.type == POINTEDTHING_NODE) {
// Re-send block to revert change on client-side
RemoteClient *client = getClient(peer_id);
v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
client->SetBlockNotSent(blockpos);
}
// Call callbacks
m_script->on_cheat(playersao, "interacted_while_dead");
return;
}
process_PlayerPos(player, playersao, pkt);
v3f player_pos = playersao->getLastGoodPosition();
// Update wielded item
if (item_i >= player->getHotbarItemcount()) {
actionstream << "Player: " << player->getName()
<< " tried to access item=" << item_i
<< " out of hotbar_itemcount="
<< player->getHotbarItemcount()
<< "; ignoring." << std::endl;
return;
}
playersao->getPlayer()->setWieldIndex(item_i);
// 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;
}