2020-10-10 23:02:13 +00:00
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#include <string>
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#include <stdint.h>
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#include <ctime>
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#include <cstdio>
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#include <csignal>
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#include <fstream>
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#include <unistd.h>
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#include <SDL/SDL_events.h>
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#include <libcore/libcore.h>
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#include "server.h"
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#include "server_properties.h"
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typedef void (*Minecraft_update_t)(unsigned char *minecraft);
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static Minecraft_update_t Minecraft_update = (Minecraft_update_t) 0x16b74;
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static void *Minecraft_update_original = NULL;
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struct LevelSettings {
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unsigned long seed;
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int32_t game_type;
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};
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typedef void (*Minecraft_selectLevel_t)(unsigned char *minecraft, std::string const& level_dir, std::string const& level_name, LevelSettings const& vsettings);
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static Minecraft_selectLevel_t Minecraft_selectLevel = (Minecraft_selectLevel_t) 0x16f38;
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typedef void (*Minecraft_hostMultiplayer_t)(unsigned char *minecraft, int32_t port);
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static Minecraft_hostMultiplayer_t Minecraft_hostMultiplayer = (Minecraft_hostMultiplayer_t) 0x16664;
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typedef void *(*ProgressScreen_t)(unsigned char *obj);
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static ProgressScreen_t ProgressScreen = (ProgressScreen_t) 0x37044;
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typedef void (*Minecraft_setScreen_t)(unsigned char *minecraft, unsigned char *screen);
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static Minecraft_setScreen_t Minecraft_setScreen = (Minecraft_setScreen_t) 0x15d6c;
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2020-10-10 23:39:29 +00:00
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#define INFO(msg, ...) fprintf(stderr, "[INFO]: " msg "\n", __VA_ARGS__);
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2020-10-10 23:02:13 +00:00
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// Store Minecraft For Exit
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static unsigned char *stored_minecraft = NULL;
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// Server Properties
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static ServerProperties &get_server_properties() {
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static ServerProperties properties;
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return properties;
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}
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// Default Server Properties
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#define DEFAULT_MOTD "Minecraft Server"
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#define DEFAULT_GAME_MODE "0"
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#define DEFAULT_PORT "19132"
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#define DEFAULT_SEED ""
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#define DEFAULT_MOB_SPAWNING "true"
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#define DEFAULT_WORLD_NAME "world"
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typedef const char *(*Minecraft_getProgressMessage_t)(unsigned char *minecraft);
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static Minecraft_getProgressMessage_t Minecraft_getProgressMessage = (Minecraft_getProgressMessage_t) 0x16e58;
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typedef int32_t (*Minecraft_isLevelGenerated_t)(unsigned char *minecraft);
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static Minecraft_isLevelGenerated_t Minecraft_isLevelGenerated = (Minecraft_isLevelGenerated_t) 0x16e6c;
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#define SIGNIFICANT_PROGRESS 5
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// Check If Two Percentages Are Different Enough To Be Logged
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static bool is_progress_difference_significant(int32_t new_val, int32_t old_val) {
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if (new_val != old_val) {
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if (new_val == -1 || old_val == -1) {
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return true;
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} else if (new_val == 0 || new_val == 100) {
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return true;
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} else {
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return new_val - old_val >= SIGNIFICANT_PROGRESS;
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}
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} else {
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return false;
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}
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}
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// Runs Every Tick
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static int last_progress = -1;
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static const char *last_message = NULL;
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static bool loaded = false;
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static void Minecraft_update_injection(unsigned char *minecraft) {
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// Create/Start World
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if (!loaded) {
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INFO("%s", "Starting Minecraft: Pi Edition Dedicated Server");
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LevelSettings settings;
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settings.game_type = 0; // Patched By MCPI-Docker
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std::string seed_str = get_server_properties().get_string("seed", DEFAULT_SEED);
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int32_t seed = seed_str.length() > 0 ? std::stoi(seed_str) : time(NULL);
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settings.seed = seed;
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std::string world_name = get_server_properties().get_string("world-name", DEFAULT_WORLD_NAME);
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(*Minecraft_selectLevel)(minecraft, world_name, world_name, settings);
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int port = get_server_properties().get_int("port", DEFAULT_PORT);
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(*Minecraft_hostMultiplayer)(minecraft, port);
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INFO("Listening On: %i", port);
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void *screen = ::operator new(0x4c);
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screen = (*ProgressScreen)((unsigned char *) screen);
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(*Minecraft_setScreen)(minecraft, (unsigned char *) screen);
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stored_minecraft = minecraft;
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loaded = true;
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}
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// Print Progress Message
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const char *message = (*Minecraft_getProgressMessage)(minecraft);
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int32_t progress = *(int32_t *) (minecraft + 0xc60);
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if ((*Minecraft_isLevelGenerated)(minecraft)) {
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message = "Ready";
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progress = -1;
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}
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if (message != NULL) {
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bool message_different = message != last_message;
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bool progress_significant = is_progress_difference_significant(progress, last_progress);
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if (message_different || progress_significant) {
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if (progress != -1) {
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INFO("Status: %s: %i%%", message, progress);
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} else {
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INFO("Status: %s", message);
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}
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if (message_different) {
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last_message = message;
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}
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if (progress_significant) {
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last_progress = progress;
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}
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}
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}
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// Call Original Method
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revert_overwrite((void *) Minecraft_update, Minecraft_update_original);
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(*Minecraft_update)(minecraft);
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revert_overwrite((void *) Minecraft_update, Minecraft_update_original);
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}
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typedef void (*Level_saveLevelData_t)(unsigned char *level);
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static Level_saveLevelData_t Level_saveLevelData = (Level_saveLevelData_t) 0xa2e94;
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static void *Level_saveLevelData_original = NULL;
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static void Level_saveLevelData_injection(unsigned char *level) {
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// Print Log Message
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INFO("%s", "Saving Game");
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// Call Original Method
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revert_overwrite((void *) Level_saveLevelData, Level_saveLevelData_original);
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(*Level_saveLevelData)(level);
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revert_overwrite((void *) Level_saveLevelData, Level_saveLevelData_original);
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}
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typedef void (*Gui_addMessage_t)(unsigned char *gui, std::string const& text);
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static Gui_addMessage_t Gui_addMessage = (Gui_addMessage_t) 0x27820;
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static void *Gui_addMessage_original = NULL;
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static void Gui_addMessage_injection(unsigned char *gui, std::string const& text) {
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// Print Log Message
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2020-10-10 23:39:29 +00:00
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fprintf(stderr, "[CHAT]: %s\n", text.c_str());
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2020-10-10 23:02:13 +00:00
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// Call Original Method
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revert_overwrite((void *) Gui_addMessage, Gui_addMessage_original);
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(*Gui_addMessage)(gui, text);
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revert_overwrite((void *) Gui_addMessage, Gui_addMessage_original);
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}
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static void exit_handler(__attribute__((unused)) int data) {
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INFO("%s", "Stopping Server");
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if (stored_minecraft != NULL) {
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unsigned char *level = *(unsigned char **) (stored_minecraft + 0x188);
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if (level != NULL) {
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// Save Game
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(*Level_saveLevelData)(level);
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}
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}
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// Stop Game
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SDL_Event event;
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event.type = SDL_QUIT;
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SDL_PushEvent(&event);
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}
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const char *server_get_motd() {
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return get_server_properties().get_string("motd", DEFAULT_MOTD).c_str();
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}
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int server_get_default_game_mode() {
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return get_server_properties().get_int("game-mode", DEFAULT_GAME_MODE);
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}
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int server_get_mob_spawning() {
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return get_server_properties().get_bool("spawn-mobs", DEFAULT_MOB_SPAWNING);
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}
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void server_init() {
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// Open Properties File
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std::string file(getenv("HOME"));
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file.append("/.minecraft/server.properties");
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std::ifstream properties_file(file);
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if (!properties_file || !properties_file.is_open()) {
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// Write Defaults
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std::ofstream properties_file_output(file);
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properties_file_output << "motd=" DEFAULT_MOTD "\n";
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properties_file_output << "game-mode=" DEFAULT_GAME_MODE "\n";
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properties_file_output << "port=" DEFAULT_PORT "\n";
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properties_file_output << "seed=" DEFAULT_SEED "\n";
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properties_file_output << "spawn-mobs=" DEFAULT_MOB_SPAWNING "\n";
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properties_file_output << "world-name=" DEFAULT_WORLD_NAME "\n";
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properties_file_output.close();
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// Re-Open File
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properties_file = std::ifstream(file);
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}
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if (!properties_file.is_open()) {
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2020-10-10 23:39:29 +00:00
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fprintf(stderr, "[ERR]: Unable To Open server.properties\n");
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2020-10-10 23:02:13 +00:00
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exit(1);
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}
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// Load Properties
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get_server_properties().load(properties_file);
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properties_file.close();
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// Prevent Main Player From Loading
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unsigned char player_patch[4] = {0x00, 0x20, 0xa0, 0xe3};
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patch((void *) 0x1685c, player_patch);
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// Start World On Launch
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Minecraft_update_original = overwrite((void *) Minecraft_update, (void *) Minecraft_update_injection);
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// Print Log On Game Save
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Level_saveLevelData_original = overwrite((void *) Level_saveLevelData, (void *) Level_saveLevelData_injection);
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// Exit handler
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signal(SIGINT, exit_handler);
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// Print Chat To Log
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Gui_addMessage_original = overwrite((void *) Gui_addMessage, (void *) Gui_addMessage_injection);
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2020-10-11 04:15:44 +00:00
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// Allow All IPs To Join
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2020-10-11 18:23:22 +00:00
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unsigned char allow_all_ip_patch[4] = {0x00, 0xf0, 0x20, 0xe3};
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patch((void *) 0xe1f6c, allow_all_ip_patch);
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2020-10-10 23:02:13 +00:00
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}
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