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Save Player Data

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This commit is contained in:
TheBrokenRail 2020-11-05 23:05:37 -05:00
parent da3f6739eb
commit 8e7dfd85b8
6 changed files with 307 additions and 8 deletions
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2
README.md
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@ -19,7 +19,7 @@ To use, install the ``minecraft-pi-server`` package and run ``minecraft-pi-serve
This is also compatible with MCPE 0.6.1.
### Limitations
- Player data is not saved because of limitations with MCPE LAN worlds
- Player inventories are not saved because of limitations with MCPE LAN worlds
- An easy workaround is to place your inventory in a chest before logging off
- Survival mode servers are only compatible with ``minecraft-pi-docker`` clients

4
mods/CMakeLists.txt
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@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.13.0)
project(mods)
add_compile_options(-Wall -Wextra -Werror)
add_compile_options(-g -Wall -Wextra -Werror)
add_link_options(-Wl,--no-undefined)
add_definitions(-D_GLIBCXX_USE_CXX11_ABI=0)
@ -13,7 +13,7 @@ include_directories(include)
add_library(core SHARED src/core.c)
target_link_libraries(core dl)
add_library(server SHARED src/server/server.cpp src/server/server_properties.cpp)
add_library(server SHARED src/server/server.cpp src/server/server_properties.cpp src/server/playerdata.cpp)
target_link_libraries(server core dl SDL pthread)
add_library(extra SHARED src/extra.c src/extra.cpp src/cxx11_util.cpp)

252
mods/src/server/playerdata.cpp Normal file
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@ -0,0 +1,252 @@
#include <libcore/libcore.h>
#include "playerdata.h"
#include "server_internal.h"
struct RakNet_BitStream {
unsigned char data[273];
};
typedef unsigned char *(*RakNet_BitStream_constructor_t)(RakNet_BitStream *stream);
static RakNet_BitStream_constructor_t RakNet_BitStream_constructor = (RakNet_BitStream_constructor_t) 0xd3b84;
typedef void (*RakNet_BitStream_destructor_t)(RakNet_BitStream *stream);
static RakNet_BitStream_destructor_t RakNet_BitStream_destructor = (RakNet_BitStream_destructor_t) 0xd3ce8;
struct RakDataOutput {
unsigned char data[8];
};
static unsigned char *RakDataOutput_vtable = (unsigned char *) 0x109628;
typedef unsigned char *(*CompoundTag_t)(unsigned char *tag);
static CompoundTag_t CompoundTag = (CompoundTag_t) 0xb9920;
typedef void (*Tag_writeNamedTag_t)(unsigned char *tag, RakDataOutput *output);
static Tag_writeNamedTag_t Tag_writeNamedTag = (Tag_writeNamedTag_t) 0x6850c;
typedef void (*Entity_saveWithoutId_t)(unsigned char *entity, unsigned char *tag);
typedef void (*Tag_deleteChildren_t)(unsigned char *tag);
typedef void (*Tag_destructor_t)(unsigned char *tag);
// Execute Command Without LD_PRELOAD
static void exec_without_preload(std::string str) {
std::string preload = getenv("LD_PRELOAD");
unsetenv("LD_PRELOAD");
system(str.c_str());
setenv("LD_PRELOAD", preload.c_str(), 1);
}
// Get Player Data NBT Path
static std::string get_player_data_path(std::string username) {
std::string path = std::string(getenv("HOME")) + "/.minecraft/games/com.mojang/minecraftWorlds/" + server_internal_get_world_name() + "/playerdata";
exec_without_preload("mkdir -p " + path);
return path + '/' + username + ".dat";
}
// Destruct Tag
static void destruct_tag(unsigned char *tag) {
unsigned char *tag_vtable = *(unsigned char **) tag;
Tag_deleteChildren_t Tag_deleteChildren = *(Tag_deleteChildren_t *) (tag_vtable + 0x8);
(*Tag_deleteChildren)(tag);
Tag_destructor_t Tag_destructor = *(Tag_destructor_t *) (tag_vtable + 0x4);
(*Tag_destructor)(tag);
}
// Save Player Callback
static void save_player_callback(std::string username, unsigned char *player) {
std::string nbt_file = get_player_data_path(username);
// Open File
FILE *file = fopen(nbt_file.c_str(), "wb");
// Write Storage Version
uint32_t storage_version = 3;
fwrite(&storage_version, 4, 1, file);
// Create Tag
unsigned char *tag = (unsigned char *) ::operator new(0x38);
(*CompoundTag)(tag);
// Allocate
RakNet_BitStream stream;
RakDataOutput output;
// Set VTable
*(unsigned char **) &output.data[0] = RakDataOutput_vtable;
// Construct BitStream
(*RakNet_BitStream_constructor)(&stream);
// Set BitStream
*(RakNet_BitStream **) &output.data[4] = &stream;
// Save NBT
unsigned char *player_vtable = *(unsigned char **) player;
Entity_saveWithoutId_t Entity_saveWithoutId = *(Entity_saveWithoutId_t *) (player_vtable + 0xcc);
(*Entity_saveWithoutId)(player, tag);
// Write NBT
(*Tag_writeNamedTag)(tag, &output);
// Destruct Tag
destruct_tag(tag);
// Write To File
uint32_t numberOfBitsUsed = *(uint32_t *) &stream.data[0];
uint32_t size = (numberOfBitsUsed + 7) >> 3;
fwrite(&size, 4, 1, file);
unsigned char *data = *(unsigned char **) &stream.data[12];
fwrite(data, 1, size, file);
// Destruct BitStream
(*RakNet_BitStream_destructor)(&stream);
// Close File
fclose(file);
}
struct RakDataInput {
unsigned char data[8];
};
static unsigned char *RakDataInput_vtable = (unsigned char *) 0x1095c8;
typedef long int (*getRemainingFileSize_t)(FILE *file);
static getRemainingFileSize_t getRemainingFileSize = (getRemainingFileSize_t) 0xba520;
typedef RakNet_BitStream *(*RakNet_BitStream_constructor_with_data_t)(RakNet_BitStream *stream, unsigned char *data, uint32_t size, bool copyData);
static RakNet_BitStream_constructor_with_data_t RakNet_BitStream_constructor_with_data = (RakNet_BitStream_constructor_with_data_t) 0xd3c30;
typedef unsigned char *(*NbtIo_read_t)(RakDataInput *input);
static NbtIo_read_t NbtIo_read = (NbtIo_read_t) 0xb98cc;
typedef void (*Entity_load_t)(unsigned char *entity, unsigned char *tag);
// Load Player Callback
static void load_player_callback(std::string username, unsigned char *player) {
std::string nbt_file = get_player_data_path(username);
// Open File
FILE *file = fopen(nbt_file.c_str(), "rb");
if (file) {
uint32_t storage_version;
size_t data_read = fread(&storage_version, 4, 1, file);
// Check File
if (data_read == 1 && storage_version == 3) {
// Read Expected File Size
uint32_t expected_size;
data_read = fread(&expected_size, 4, 1, file);
// Get Actual Size
long int remaining = (*getRemainingFileSize)(file);
if (data_read == 1 && expected_size > 0 && ((uint32_t) remaining) == expected_size) {
// Read File
unsigned char *data = (unsigned char *) malloc(expected_size);
data_read = fread(data, 1, expected_size, file);
if (data_read == expected_size) {
// Allocate
RakNet_BitStream stream;
RakDataInput input;
// Set VTable
*(unsigned char **) &input.data[0] = RakDataInput_vtable;
// Construct BitStream
(*RakNet_BitStream_constructor_with_data)(&stream, data, expected_size, false);
// Set BitStream
*(RakNet_BitStream **) &input.data[4] = &stream;
// Create Tag
unsigned char *tag = (*NbtIo_read)(&input);
if (tag != NULL) {
// Load Data
unsigned char *player_vtable = *(unsigned char **) player;
Entity_load_t Entity_load = *(Entity_load_t *) (player_vtable + 0xd0);
(*Entity_load)(player, tag);
// Destruct tag
destruct_tag(tag);
}
// Destruct BitStream
(*RakNet_BitStream_destructor)(&stream);
}
// Free Data
free(data);
}
}
// Close File
fclose(file);
}
}
typedef void (*Entity_moveTo_t)(unsigned char *entity, float param_1, float param_2, float param_3, float param_4, float param_5);
static Entity_moveTo_t Entity_moveTo = (Entity_moveTo_t) 0x7a834;
static uint32_t get_entity_id(unsigned char *entity) {
return *(uint32_t *) (entity + 0x1c);
}
static void ServerPlayer_moveTo_injection(unsigned char *player, float param_1, float param_2, float param_3, float param_4, float param_5) {
// Call Original Method
(*Entity_moveTo)(player, param_1, param_2, param_3, param_4, param_5);
// Check If Player Is Spawned
unsigned char *minecraft = *(unsigned char **) (player + 0xc8c);
unsigned char *level = server_internal_get_level(minecraft);
std::vector<unsigned char *> players = server_internal_get_players(level);
bool spawned = false;
uint32_t player_id = get_entity_id(player);
for (std::size_t i = 0; i < players.size(); i++) {
if (player_id == get_entity_id(players[i])) {
spawned = true;
break;
}
}
// Load Data
if (!spawned) {
load_player_callback(server_internal_get_player_username(player), player);
}
}
void playerdata_save(unsigned char *level) {
// Save Players
std::vector<unsigned char *> players = server_internal_get_players(level);
for (std::size_t i = 0; i < players.size(); i++) {
// Iterate Players
unsigned char *player = players[i];
std::string username = server_internal_get_player_username(player);
save_player_callback(username, player);
}
}
typedef void (*ServerSideNetworkHandler_onDisconnect_t)(unsigned char *server_side_network_handler, unsigned char *guid);
static ServerSideNetworkHandler_onDisconnect_t ServerSideNetworkHandler_onDisconnect = (ServerSideNetworkHandler_onDisconnect_t) 0x75164;
typedef unsigned char *(*ServerSideNetworkHandler_getPlayer_t)(unsigned char *server_side_network_handler, unsigned char *guid);
static ServerSideNetworkHandler_getPlayer_t ServerSideNetworkHandler_getPlayer = (ServerSideNetworkHandler_getPlayer_t) 0x75464;
static void ServerSideNetworkHandler_onDisconnect_injection(unsigned char *server_side_network_handler, unsigned char *guid) {
// Save Player Data
unsigned char *player = (*ServerSideNetworkHandler_getPlayer)(server_side_network_handler, guid);
if (player != NULL) {
std::string username = server_internal_get_player_username(player);
save_player_callback(username, player);
}
// Call Original Method
(*ServerSideNetworkHandler_onDisconnect)(server_side_network_handler, guid);
}
void playerdata_init() {
// Load Player NBT
patch_address((void *) 0x109e54, (void *) ServerPlayer_moveTo_injection);
// Save On Logout
patch_address((void *) 0x109bb0, (void *) ServerSideNetworkHandler_onDisconnect_injection);
}

8
mods/src/server/playerdata.h Normal file
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@ -0,0 +1,8 @@
#ifndef PLAYERDATA_H
#define PLAYERDATA_H
void playerdata_save(unsigned char *level);
void playerdata_init();
#endif

36
mods/src/server/server.cpp
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@ -15,7 +15,9 @@
#include <libcore/libcore.h>
#include "server.h"
#include "server_internal.h"
#include "server_properties.h"
#include "playerdata.h"
// Server Properties
static ServerProperties &get_server_properties() {
@ -79,6 +81,11 @@ static ProgressScreen_t ProgressScreen = (ProgressScreen_t) 0x37044;
typedef void (*Minecraft_setScreen_t)(unsigned char *minecraft, unsigned char *screen);
static Minecraft_setScreen_t Minecraft_setScreen = (Minecraft_setScreen_t) 0x15d6c;
// Get World Name
std::string server_internal_get_world_name() {
return get_server_properties().get_string("world-name", DEFAULT_WORLD_NAME);
}
// Create/Start World
static void start_world(unsigned char *minecraft) {
INFO("%s", "Starting Minecraft: Pi Edition Dedicated Server");
@ -89,7 +96,7 @@ static void start_world(unsigned char *minecraft) {
int32_t seed = seed_str.length() > 0 ? std::stoi(seed_str) : time(NULL);
settings.seed = seed;
std::string world_name = get_server_properties().get_string("world-name", DEFAULT_WORLD_NAME);
std::string world_name = server_internal_get_world_name();
(*Minecraft_selectLevel)(minecraft, world_name, world_name, settings);
int port = get_server_properties().get_int("port", DEFAULT_PORT);
@ -175,15 +182,28 @@ static std::string get_banned_ips_file() {
typedef void (*player_callback_t)(unsigned char *minecraft, std::string username, unsigned char *player);
// Get Vector Of Players In Level
std::vector<unsigned char *> server_internal_get_players(unsigned char *level) {
return *(std::vector<unsigned char *> *) (level + 0x60);
}
// Get Player's Username
std::string server_internal_get_player_username(unsigned char *player) {
return *(char **) (player + 0xbf4);
}
// Get Level From Minecraft
unsigned char *server_internal_get_level(unsigned char *minecraft) {
return *(unsigned char **) (minecraft + 0x188);
}
// Find Players With Username And Run Callback
static void find_players(unsigned char *minecraft, std::string target_username, player_callback_t callback, bool all_players) {
unsigned char *level = *(unsigned char **) (minecraft + 0x188);
std::vector<unsigned char *> players = *(std::vector<unsigned char *> *) (level + 0x60);
unsigned char *level = server_internal_get_level(minecraft);
std::vector<unsigned char *> players = server_internal_get_players(level);
bool found_player = false;
for (std::size_t i = 0; i < players.size(); i++) {
// Iterate Players
unsigned char *player = players[i];
std::string username = *(std::string *) (player + 0xbf4);
std::string username = server_internal_get_player_username(player);
if (all_players || username == target_username) {
// Run Callback
(*callback)(minecraft, username, player);
@ -263,6 +283,9 @@ static void Level_saveLevelData_injection(unsigned char *level) {
revert_overwrite((void *) Level_saveLevelData, Level_saveLevelData_original);
(*Level_saveLevelData)(level);
revert_overwrite((void *) Level_saveLevelData, Level_saveLevelData_original);
// Save Player Data
playerdata_save(level);
}
typedef void (*Minecraft_leaveGame_t)(unsigned char *minecraft, bool save_remote_level);
@ -277,7 +300,7 @@ static void handle_server_stop(unsigned char *minecraft) {
if (exit_requested) {
INFO("%s", "Stopping Server");
// Save And Exit
unsigned char *level = *(unsigned char **) (minecraft + 0x188);
unsigned char *level = server_internal_get_level(minecraft);
(*Level_saveLevelData)(level);
(*Minecraft_leaveGame)(minecraft, false);
// Stop Game
@ -518,6 +541,9 @@ void server_init() {
// Custom Banned IP List
RakNet_RakPeer_IsBanned_original = overwrite((void *) RakNet_RakPeer_IsBanned, (void *) RakNet_RakPeer_IsBanned_injection);
// Load Player Data
playerdata_init();
if (get_server_properties().get_bool("show-minecon-icon", DEFAULT_SHOW_MINECON_ICON)) {
// Show The MineCon Icon Next To MOTD In Server List
unsigned char minecon_icon_patch[4] = {0x04, 0x1a, 0x9f, 0xe5};

13
mods/src/server/server_internal.h Normal file
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@ -0,0 +1,13 @@
#ifndef SERVER_INTERNAL_H
#define SERVER_INTERNAL_H
#include <string>
#include <vector>
std::string server_internal_get_world_name();
unsigned char *server_internal_get_level(unsigned char *minecraft);
std::vector<unsigned char *> server_internal_get_players(unsigned char *level);
std::string server_internal_get_player_username(unsigned char *player);
#endif