minecraft-pi-docker/mods/src/server/server.cpp

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#include <string>
#include <stdint.h>
#include <ctime>
#include <cstdio>
#include <csignal>
#include <fstream>
#include <pthread.h>
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#include <unistd.h>
#include <SDL/SDL_events.h>
#include <libcore/libcore.h>
#include "server.h"
#include "server_properties.h"
typedef void (*Minecraft_update_t)(unsigned char *minecraft);
static Minecraft_update_t Minecraft_update = (Minecraft_update_t) 0x16b74;
static void *Minecraft_update_original = NULL;
struct LevelSettings {
unsigned long seed;
int32_t game_type;
};
typedef void (*Minecraft_selectLevel_t)(unsigned char *minecraft, std::string const& level_dir, std::string const& level_name, LevelSettings const& vsettings);
static Minecraft_selectLevel_t Minecraft_selectLevel = (Minecraft_selectLevel_t) 0x16f38;
typedef void (*Minecraft_hostMultiplayer_t)(unsigned char *minecraft, int32_t port);
static Minecraft_hostMultiplayer_t Minecraft_hostMultiplayer = (Minecraft_hostMultiplayer_t) 0x16664;
typedef void *(*ProgressScreen_t)(unsigned char *obj);
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;
// Store Minecraft For Exit
static unsigned char *stored_minecraft = NULL;
// Server Properties
static ServerProperties &get_server_properties() {
static ServerProperties properties;
return properties;
}
// Default Server Properties
#define DEFAULT_MOTD "Minecraft Server"
#define DEFAULT_GAME_MODE "0"
#define DEFAULT_PORT "19132"
#define DEFAULT_SEED ""
#define DEFAULT_MOB_SPAWNING "true"
#define DEFAULT_WORLD_NAME "world"
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#define DEFAULT_MAX_PLAYERS "4"
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typedef const char *(*Minecraft_getProgressMessage_t)(unsigned char *minecraft);
static Minecraft_getProgressMessage_t Minecraft_getProgressMessage = (Minecraft_getProgressMessage_t) 0x16e58;
typedef int32_t (*Minecraft_isLevelGenerated_t)(unsigned char *minecraft);
static Minecraft_isLevelGenerated_t Minecraft_isLevelGenerated = (Minecraft_isLevelGenerated_t) 0x16e6c;
#define SIGNIFICANT_PROGRESS 5
// Check If Two Percentages Are Different Enough To Be Logged
static bool is_progress_difference_significant(int32_t new_val, int32_t old_val) {
if (new_val != old_val) {
if (new_val == -1 || old_val == -1) {
return true;
} else if (new_val == 0 || new_val == 100) {
return true;
} else {
return new_val - old_val >= SIGNIFICANT_PROGRESS;
}
} else {
return false;
}
}
// Read STDIN Thread
static volatile bool stdin_buffer_complete = false;
static volatile char *stdin_buffer = NULL;
static void *read_stdin_thread(__attribute__((unused)) void *data) {
while (1) {
if (!stdin_buffer_complete) {
int x = getchar();
if (x != EOF) {
if (x == '\n') {
if (stdin_buffer == NULL) {
stdin_buffer = strdup("");
}
stdin_buffer_complete = true;
} else {
if (stdin_buffer == NULL) {
asprintf((char **) &stdin_buffer, "%c", (char) x);
} else {
asprintf((char **) &stdin_buffer, "%s%c", stdin_buffer, (char) x);
}
}
}
}
}
}
typedef void (*ServerSideNetworkHandler_displayGameMessage_t)(unsigned char *server_side_network_handler, std::string const& message);
static ServerSideNetworkHandler_displayGameMessage_t ServerSideNetworkHandler_displayGameMessage = (ServerSideNetworkHandler_displayGameMessage_t) 0x750c4;
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// Runs Every Tick
static int last_progress = -1;
static const char *last_message = NULL;
static bool loaded = false;
static void Minecraft_update_injection(unsigned char *minecraft) {
// Create/Start World
if (!loaded) {
INFO("%s", "Starting Minecraft: Pi Edition Dedicated Server");
LevelSettings settings;
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settings.game_type = get_server_properties().get_int("game-mode", DEFAULT_GAME_MODE);;
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std::string seed_str = get_server_properties().get_string("seed", DEFAULT_SEED);
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);
(*Minecraft_selectLevel)(minecraft, world_name, world_name, settings);
int port = get_server_properties().get_int("port", DEFAULT_PORT);
(*Minecraft_hostMultiplayer)(minecraft, port);
INFO("Listening On: %i", port);
void *screen = ::operator new(0x4c);
screen = (*ProgressScreen)((unsigned char *) screen);
(*Minecraft_setScreen)(minecraft, (unsigned char *) screen);
stored_minecraft = minecraft;
loaded = true;
}
// Print Progress Message
const char *message = (*Minecraft_getProgressMessage)(minecraft);
int32_t progress = *(int32_t *) (minecraft + 0xc60);
if ((*Minecraft_isLevelGenerated)(minecraft)) {
message = "Ready";
progress = -1;
}
if (message != NULL) {
bool message_different = message != last_message;
bool progress_significant = is_progress_difference_significant(progress, last_progress);
if (message_different || progress_significant) {
if (progress != -1) {
INFO("Status: %s: %i%%", message, progress);
} else {
INFO("Status: %s", message);
}
if (message_different) {
last_message = message;
}
if (progress_significant) {
last_progress = progress;
}
}
}
// Call Original Method
revert_overwrite((void *) Minecraft_update, Minecraft_update_original);
(*Minecraft_update)(minecraft);
revert_overwrite((void *) Minecraft_update, Minecraft_update_original);
// Use STDIN
if (stdin_buffer_complete) {
if (stdin_buffer != NULL) {
unsigned char *server_side_network_handler = *(unsigned char **) (minecraft + 0x174);
if (server_side_network_handler != NULL) {
char *message = NULL;
// Format Message
asprintf(&message, "[Server] %s", stdin_buffer);
// Post Message To Chat
(*ServerSideNetworkHandler_displayGameMessage)(server_side_network_handler, message);
free(message);
}
free((void *) stdin_buffer);
stdin_buffer = NULL;
}
stdin_buffer_complete = false;
}
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}
typedef void (*Level_saveLevelData_t)(unsigned char *level);
static Level_saveLevelData_t Level_saveLevelData = (Level_saveLevelData_t) 0xa2e94;
static void *Level_saveLevelData_original = NULL;
static void Level_saveLevelData_injection(unsigned char *level) {
// Print Log Message
INFO("%s", "Saving Game");
// Call Original Method
revert_overwrite((void *) Level_saveLevelData, Level_saveLevelData_original);
(*Level_saveLevelData)(level);
revert_overwrite((void *) Level_saveLevelData, Level_saveLevelData_original);
}
typedef void (*Gui_addMessage_t)(unsigned char *gui, std::string const& text);
static Gui_addMessage_t Gui_addMessage = (Gui_addMessage_t) 0x27820;
static void *Gui_addMessage_original = NULL;
static void Gui_addMessage_injection(unsigned char *gui, std::string const& text) {
// Print Log Message
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fprintf(stderr, "[CHAT]: %s\n", text.c_str());
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// Call Original Method
revert_overwrite((void *) Gui_addMessage, Gui_addMessage_original);
(*Gui_addMessage)(gui, text);
revert_overwrite((void *) Gui_addMessage, Gui_addMessage_original);
}
static void exit_handler(__attribute__((unused)) int data) {
INFO("%s", "Stopping Server");
if (stored_minecraft != NULL) {
unsigned char *level = *(unsigned char **) (stored_minecraft + 0x188);
if (level != NULL) {
// Save Game
(*Level_saveLevelData)(level);
}
}
// Stop Game
SDL_Event event;
event.type = SDL_QUIT;
SDL_PushEvent(&event);
}
const char *server_get_motd() {
return get_server_properties().get_string("motd", DEFAULT_MOTD).c_str();
}
int server_get_mob_spawning() {
return get_server_properties().get_bool("spawn-mobs", DEFAULT_MOB_SPAWNING);
}
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static unsigned char server_get_max_players() {
int val = get_server_properties().get_int("max-players", DEFAULT_MAX_PLAYERS);
if (val < 0) {
val = 0;
}
if (val > 255) {
val = 255;
}
return (unsigned char) val;
}
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void server_init() {
// Open Properties File
std::string file(getenv("HOME"));
file.append("/.minecraft/server.properties");
std::ifstream properties_file(file);
if (!properties_file || !properties_file.is_open()) {
// Write Defaults
std::ofstream properties_file_output(file);
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properties_file_output << "# Message Of The Day\n";
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properties_file_output << "motd=" DEFAULT_MOTD "\n";
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properties_file_output << "# Game Mode (0 = Survival, 1 = Creative)\n";
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properties_file_output << "game-mode=" DEFAULT_GAME_MODE "\n";
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properties_file_output << "# Port\n";
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properties_file_output << "port=" DEFAULT_PORT "\n";
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properties_file_output << "# World Seed (Blank = Random Seed)\n";
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properties_file_output << "seed=" DEFAULT_SEED "\n";
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properties_file_output << "# Mob Spawning (false = Disabled, true = Enabled)\n";
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properties_file_output << "spawn-mobs=" DEFAULT_MOB_SPAWNING "\n";
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properties_file_output << "# World To Select\n";
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properties_file_output << "world-name=" DEFAULT_WORLD_NAME "\n";
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properties_file_output << "# Maximum Player Count\n";
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properties_file_output << "max-players=" DEFAULT_MAX_PLAYERS "\n";
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properties_file_output.close();
// Re-Open File
properties_file = std::ifstream(file);
}
if (!properties_file.is_open()) {
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ERR("%s", "Unable To Open server.properties");
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}
// Load Properties
get_server_properties().load(properties_file);
properties_file.close();
// Prevent Main Player From Loading
unsigned char player_patch[4] = {0x00, 0x20, 0xa0, 0xe3};
patch((void *) 0x1685c, player_patch);
// Start World On Launch
Minecraft_update_original = overwrite((void *) Minecraft_update, (void *) Minecraft_update_injection);
// Print Log On Game Save
Level_saveLevelData_original = overwrite((void *) Level_saveLevelData, (void *) Level_saveLevelData_injection);
// Exit handler
signal(SIGINT, exit_handler);
// Print Chat To Log
Gui_addMessage_original = overwrite((void *) Gui_addMessage, (void *) Gui_addMessage_injection);
// Allow All IPs To Join
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unsigned char allow_all_ip_patch[4] = {0x00, 0xf0, 0x20, 0xe3};
patch((void *) 0xe1f6c, allow_all_ip_patch);
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// Set Max Players
unsigned char max_players_patch[4] = {server_get_max_players(), 0x30, 0xa0, 0xe3};
patch((void *) 0x166d0, max_players_patch);
// Start Reading STDIN
pthread_t read_stdin_thread_obj;
pthread_create(&read_stdin_thread_obj, NULL, read_stdin_thread, NULL);
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}