Minecraft: Pi Edition Modding Project https://mcpirevival.tk/
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#ifndef MCPI_SERVER_MODE
#error "Server Code Requires Server Mode"
#endif
#include <string>
#include <stdint.h>
#include <ctime>
#include <cstdio>
#include <fstream>
#include <vector>
#include <pthread.h>
#include <unistd.h>
#include <SDL/SDL.h>
#include <libreborn/libreborn.h>
#include "server_properties.h"
#include "../feature/feature.h"
#include "../init/init.h"
#include "../home/home.h"
#include "../compat/compat.h"
#include "../version/version.h"
#include <symbols/minecraft.h>
// --only-generate: Ony Generate World And Then Exit
static bool only_generate = false;
__attribute__((constructor)) static void _init_only_generate(int argc, char *argv[]) {
// Iterate Arguments
for (int i = 1; i < argc; i++) {
// Check Argument
if (strcmp(argv[i], "--only-generate") == 0) {
// Enabled
only_generate = true;
break;
}
}
}
// Server Properties
static ServerProperties &get_server_properties() {
static ServerProperties properties;
return properties;
}
// Default Server Properties
#define DEFAULT_MOTD "Minecraft Server"
#define DEFAULT_SHOW_MINECON_BADGE "false"
#define DEFAULT_GAME_MODE "0"
#define DEFAULT_PORT "19132"
#define DEFAULT_SEED ""
#define DEFAULT_FORCE_MOB_SPAWNING "false"
#define DEFAULT_PEACEFUL_MODE "false"
#define DEFAULT_WORLD_NAME "world"
#define DEFAULT_MAX_PLAYERS "4"
#define DEFAULT_WHITELIST "false"
// Get World Name
static std::string 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("Starting Minecraft: Pi Edition: Dedicated Server (%s)", version_get());
// Specify Level Settings
LevelSettings settings;
settings.game_type = get_server_properties().get_int("game-mode", DEFAULT_GAME_MODE);;
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;
// Select Level
std::string world_name = get_world_name();
(*Minecraft_selectLevel)(minecraft, world_name, world_name, settings);
// Don't Open Port When Using --only-generate
if (!only_generate) {
// Open Port
int port = get_server_properties().get_int("port", DEFAULT_PORT);
INFO("Listening On: %i", port);
(*Minecraft_hostMultiplayer)(minecraft, port);
}
// Open ProgressScreen
void *screen = ::operator new(PROGRESS_SCREEN_SIZE);
ALLOC_CHECK(screen);
screen = (*ProgressScreen)((unsigned char *) screen);
(*Minecraft_setScreen)(minecraft, (unsigned char *) screen);
}
// Check If Two Percentages Are Different Enough To Be Logged
#define SIGNIFICANT_PROGRESS 5
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;
}
}
// Print Progress Reports
static int last_progress = -1;
static const char *last_message = NULL;
static void print_progress(unsigned char *minecraft) {
const char *message = (*Minecraft_getProgressMessage)(minecraft);
int32_t progress = *(int32_t *) (minecraft + Minecraft_progress_property_offset);
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;
}
}
}
}
// Check If Running In Whitelist Mode
static bool is_whitelist() {
return get_server_properties().get_bool("whitelist", DEFAULT_WHITELIST);
}
// Get Path Of Blacklist (Or Whitelist) File
static std::string get_blacklist_file() {
std::string file(home_get());
file.append(is_whitelist() ? "/whitelist.txt" : "/blacklist.txt");
return file;
}
// Get Vector Of Players In Level
static std::vector<unsigned char *> get_players_in_level(unsigned char *level) {
return *(std::vector<unsigned char *> *) (level + Level_players_property_offset);
}
// Get Player's Username
static std::string get_player_username(unsigned char *player) {
return *(char **) (player + Player_username_property_offset);
}
// Get Level From Minecraft
static unsigned char *get_level(unsigned char *minecraft) {
return *(unsigned char **) (minecraft + Minecraft_level_property_offset);
}
// Find Players With Username And Run Callback
typedef void (*player_callback_t)(unsigned char *minecraft, std::string username, unsigned char *player);
static void find_players(unsigned char *minecraft, std::string target_username, player_callback_t callback, bool all_players) {
unsigned char *level = get_level(minecraft);
std::vector<unsigned char *> players = get_players_in_level(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 = get_player_username(player);
if (all_players || username == target_username) {
// Run Callback
(*callback)(minecraft, username, player);
found_player = true;
}
}
if (!all_players && !found_player) {
INFO("Invalid Player: %s", target_username.c_str());
}
}
// Get RakNet Objects
static RakNet_RakNetGUID get_rak_net_guid(unsigned char *player) {
return *(RakNet_RakNetGUID *) (player + ServerPlayer_guid_property_offset);
}
static RakNet_SystemAddress get_system_address(unsigned char *rak_peer, RakNet_RakNetGUID guid) {
unsigned char *rak_peer_vtable = *(unsigned char **) rak_peer;
RakNet_RakPeer_GetSystemAddressFromGuid_t RakNet_RakPeer_GetSystemAddressFromGuid = *(RakNet_RakPeer_GetSystemAddressFromGuid_t *) (rak_peer_vtable + RakNet_RakPeer_GetSystemAddressFromGuid_vtable_offset);
// Get SystemAddress
return (*RakNet_RakPeer_GetSystemAddressFromGuid)(rak_peer, guid);
}
static unsigned char *get_rak_peer(unsigned char *minecraft) {
unsigned char *rak_net_instance = *(unsigned char **) (minecraft + Minecraft_rak_net_instance_property_offset);
return *(unsigned char **) (rak_net_instance + RakNetInstance_peer_property_offset);
}
static char *get_rak_net_guid_ip(unsigned char *rak_peer, RakNet_RakNetGUID guid) {
RakNet_SystemAddress address = get_system_address(rak_peer, guid);
// Get IP
return (*RakNet_SystemAddress_ToString)(&address, false, '|');
}
// Get IP From Player
static char *get_player_ip(unsigned char *minecraft, unsigned char *player) {
unsigned char *rak_peer = get_rak_peer(minecraft);
RakNet_RakNetGUID guid = get_rak_net_guid(player);
// Return
return get_rak_net_guid_ip(rak_peer,guid);
}
// Ban Player
static void ban_callback(unsigned char *minecraft, std::string username, unsigned char *player) {
// Get IP
char *ip = get_player_ip(minecraft, player);
// Ban Player
INFO("Banned: %s (%s)", username.c_str(), ip);
// Write To File
std::ofstream blacklist_output(get_blacklist_file(), std::ios_base::app);
if (blacklist_output) {
if (blacklist_output.good()) {
blacklist_output << "# " << username << '\n' << ip << '\n';
}
if (blacklist_output.is_open()) {
blacklist_output.close();
}
}
}
// Kill Player
static void kill_callback(__attribute__((unused)) unsigned char *minecraft, __attribute__((unused)) std::string username, unsigned char *player) {
unsigned char *player_vtable = *(unsigned char **) player;
Mob_actuallyHurt_t Player_actuallyHurt = *(Mob_actuallyHurt_t *) (player_vtable + Mob_actuallyHurt_vtable_offset);
(*Player_actuallyHurt)(player, INT32_MAX);
INFO("Killed: %s", username.c_str());
}
// List Player
static void list_callback(unsigned char *minecraft, std::string username, unsigned char *player) {
INFO(" - %s (%s)", username.c_str(), get_player_ip(minecraft, player));
}
// Log When Game Is Saved
static void Level_saveLevelData_injection(unsigned char *level) {
// Print Log Message
INFO("%s", "Saving Game");
// Call Original Method
(*Level_saveLevelData)(level);
}
// Handle Server Stop
static void handle_server_stop(unsigned char *minecraft) {
if (compat_check_exit_requested()) {
INFO("%s", "Stopping Server");
// Save And Exit
unsigned char *level = get_level(minecraft);
if (level != NULL) {
Level_saveLevelData_injection(level);
}
(*Minecraft_leaveGame)(minecraft, false);
// Stop Game
SDL_Event event;
event.type = SDL_QUIT;
SDL_PushEvent(&event);
}
}
// Get ServerSideNetworkHandler From Minecraft
static unsigned char *get_server_side_network_handler(unsigned char *minecraft) {
return *(unsigned char **) (minecraft + Minecraft_network_handler_property_offset);
}
// 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) {
// Check If STDIN Is A TTY
if (isatty(fileno(stdin))) {
// Loop
while (1) {
if (!stdin_buffer_complete) {
// Read Data
int x = fgetc(stdin);
if (x != EOF) {
if (x == '\n') {
if (stdin_buffer == NULL) {
stdin_buffer = strdup("");
}
stdin_buffer_complete = true;
} else {
string_append((char **) &stdin_buffer, "%c", (char) x);
}
}
}
}
}
return NULL;
}
__attribute__((destructor)) static void _free_stdin_buffer() {
if (stdin_buffer != NULL) {
free((void *) stdin_buffer);
stdin_buffer = NULL;
}
}
// Handle Commands
static void handle_commands(unsigned char *minecraft) {
// Check If Level Is Generated
if ((*Minecraft_isLevelGenerated)(minecraft) && stdin_buffer_complete) {
// Command Ready; Run It
if (stdin_buffer != NULL) {
unsigned char *server_side_network_handler = get_server_side_network_handler(minecraft);
if (server_side_network_handler != NULL) {
std::string data((char *) stdin_buffer);
static std::string ban_command("ban ");
static std::string say_command("say ");
static std::string kill_command("kill ");
static std::string list_command("list");
static std::string stop_command("stop");
static std::string help_command("help");
if (!is_whitelist() && data.rfind(ban_command, 0) == 0) {
// IP-Ban Target Username
std::string ban_username = data.substr(ban_command.length());
find_players(minecraft, ban_username, ban_callback, false);
} else if (data.rfind(kill_command, 0) == 0) {
// Kill Target Username
std::string kill_username = data.substr(kill_command.length());
find_players(minecraft, kill_username, kill_callback, false);
} else if (data.rfind(say_command, 0) == 0) {
// Format Message
std::string message = "[Server] " + data.substr(say_command.length());
// Post Message To Chat
(*ServerSideNetworkHandler_displayGameMessage)(server_side_network_handler, message);
} else if (data == list_command) {
// List Players
INFO("%s", "All Players:");
find_players(minecraft, "", list_callback, true);
} else if (data == stop_command) {
// Stop Server
compat_request_exit();
} else if (data == help_command) {
INFO("%s", "All Commands:");
if (!is_whitelist()) {
INFO("%s", " ban <Username> - IP-Ban All Players With Specifed Username");
}
INFO("%s", " kill <Username> - Kill All Players With Specifed Username");
INFO("%s", " say <Message> - Print Specified Message To Chat");
INFO("%s", " list - List All Players");
INFO("%s", " stop - Stop Server");
INFO("%s", " help - Print This Message");
} else {
INFO("Invalid Command: %s", data.c_str());
}
}
// Free
free((void *) stdin_buffer);
stdin_buffer = NULL;
}
stdin_buffer_complete = false;
}
}
// Runs Every Tick
static bool loaded = false;
static void Minecraft_update_injection(unsigned char *minecraft) {
// Create/Start World
if (!loaded) {
start_world(minecraft);
loaded = true;
}
// Handle --only-generate
if (only_generate && (*Minecraft_isLevelGenerated)(minecraft)) {
// Request Exit
compat_request_exit();
// Disable Special Behavior After Requesting Exit
only_generate = false;
}
// Print Progress Reports
print_progress(minecraft);
// Call Original Method
(*Minecraft_update)(minecraft);
// Handle Commands
handle_commands(minecraft);
// Server Stop
handle_server_stop(minecraft);
}
// Ban Players
static bool RakNet_RakPeer_IsBanned_injection(__attribute__((unused)) unsigned char *rakpeer, const char *ip) {
// Check banned-ips.txt
std::string blacklist_file_path = get_blacklist_file();
std::ifstream blacklist_file(blacklist_file_path);
if (blacklist_file) {
bool ret = false;
if (blacklist_file.good()) {
std::string line;
while (std::getline(blacklist_file, line)) {
// Check Line
if (line.length() > 0) {
if (line[0] == '#') {
continue;
}
if (strcmp(line.c_str(), ip) == 0) {
// Is In File
ret = true;
break;
}
}
}
}
if (blacklist_file.is_open()) {
blacklist_file.close();
}
if (is_whitelist()) {
return !ret;
} else {
return ret;
}
} else {
ERR("%s", "Unable To Read Blacklist/Whitelist");
}
}
// Log IPs
static unsigned char *ServerSideNetworkHandler_onReady_ClientGeneration_ServerSideNetworkHandler_popPendingPlayer_injection(unsigned char *server_side_network_handler, RakNet_RakNetGUID *guid) {
// Call Original Method
unsigned char *player = (*ServerSideNetworkHandler_popPendingPlayer)(server_side_network_handler, guid);
// Check If Player Is Null
if (player != NULL) {
// Get Data
char *username = (char *) *(unsigned char **) (player + Player_username_property_offset);
unsigned char *minecraft = *(unsigned char **) (server_side_network_handler + ServerSideNetworkHandler_minecraft_property_offset);
unsigned char *rak_peer = get_rak_peer(minecraft);
char *ip = get_rak_net_guid_ip(rak_peer, *guid);
// Log
INFO("%s Has Joined (IP: %s)", username, ip);
}
// Return
return player;
}
// Get MOTD
static std::string get_motd() {
std::string motd(get_server_properties().get_string("motd", DEFAULT_MOTD));
return motd;
}
// Get Feature Flags
static bool loaded_features = false;
static const char *get_features() {
static std::string features;
if (!loaded_features) {
loaded_features = true;
features.clear();
if (get_server_properties().get_bool("peaceful-mode", DEFAULT_PEACEFUL_MODE)) {
features += "Peaceful Mode|";
}
if (get_server_properties().get_bool("force-mob-spawning", DEFAULT_FORCE_MOB_SPAWNING)) {
features += "Force Mob Spawning|";
}
}
return features.c_str();
}
// Get Max Players
static unsigned char 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;
}
static void server_init() {
// Open Properties File
std::string file(home_get());
file.append("/server.properties");
std::ifstream properties_file(file);
if (!properties_file.good()) {
// Write Defaults
std::ofstream properties_file_output(file);
properties_file_output << "# Message Of The Day\n";
properties_file_output << "motd=" DEFAULT_MOTD "\n";
properties_file_output << "# Show The MineCon Badge Next To MOTD In Server List\n";
properties_file_output << "show-minecon-badge=" DEFAULT_SHOW_MINECON_BADGE "\n";
properties_file_output << "# Game Mode (0 = Survival, 1 = Creative)\n";
properties_file_output << "game-mode=" DEFAULT_GAME_MODE "\n";
properties_file_output << "# Port\n";
properties_file_output << "port=" DEFAULT_PORT "\n";
properties_file_output << "# World Seed (Blank = Random Seed)\n";
properties_file_output << "seed=" DEFAULT_SEED "\n";
properties_file_output << "# Force Mob Spawning (false = Disabled, true = Enabled)\n";
properties_file_output << "force-mob-spawning=" DEFAULT_FORCE_MOB_SPAWNING "\n";
properties_file_output << "# Peaceful Mode (false = Disabled, true = Enabled)\n";
properties_file_output << "peaceful-mode=" DEFAULT_PEACEFUL_MODE "\n";
properties_file_output << "# World To Select\n";
properties_file_output << "world-name=" DEFAULT_WORLD_NAME "\n";
properties_file_output << "# Maximum Player Count\n";
properties_file_output << "max-players=" DEFAULT_MAX_PLAYERS "\n";
properties_file_output << "# Enable Whitelist\n";
properties_file_output << "whitelist=" DEFAULT_WHITELIST "\n";
properties_file_output.close();
// Re-Open File
properties_file = std::ifstream(file);
}
// Check Properties File
if (!properties_file.is_open()) {
ERR("Unable To Open %s", file.c_str());
}
// Load Properties
get_server_properties().load(properties_file);
// Close Properties File
properties_file.close();
// Create Empty Blacklist/Whitelist File
std::string blacklist_file_path = get_blacklist_file();
std::ifstream blacklist_file(blacklist_file_path);
if (!blacklist_file.good()) {
// Write Default
std::ofstream blacklist_output(blacklist_file_path);
blacklist_output << "# Blacklist/Whitelist; Each Line Is One IP Address\n";
blacklist_output.close();
}
if (blacklist_file.is_open()) {
blacklist_file.close();
}
// Prevent Main Player From Loading
unsigned char player_patch[4] = {0x00, 0x20, 0xa0, 0xe3}; // "mov r2, #0x0"
patch((void *) 0x1685c, player_patch);
// Start World On Launch
overwrite_calls((void *) Minecraft_update, (void *) Minecraft_update_injection);
// Print Log On Game Save
overwrite_calls((void *) Level_saveLevelData, (void *) Level_saveLevelData_injection);
// Set Max Players
unsigned char max_players_patch[4] = {get_max_players(), 0x30, 0xa0, 0xe3}; // "mov r3, #MAX_PLAYERS"
patch((void *) 0x166d0, max_players_patch);
// Custom Banned IP List
overwrite((void *) RakNet_RakPeer_IsBanned, (void *) RakNet_RakPeer_IsBanned_injection);
// Show The MineCon Icon Next To MOTD In Server List
if (get_server_properties().get_bool("show-minecon-badge", DEFAULT_SHOW_MINECON_BADGE)) {
unsigned char minecon_badge_patch[4] = {0x04, 0x1a, 0x9f, 0xe5}; // "ldr r1, [0x741f0]"
patch((void *) 0x737e4, minecon_badge_patch);
}
// Log IPs
overwrite_call((void *) 0x75e54, (void *) ServerSideNetworkHandler_onReady_ClientGeneration_ServerSideNetworkHandler_popPendingPlayer_injection);
// Start Reading STDIN
pthread_t read_stdin_thread_obj;
pthread_create(&read_stdin_thread_obj, NULL, read_stdin_thread, NULL);
}
// Init Server
void init_server() {
server_init();
setenv("MCPI_FEATURE_FLAGS", get_features(), 1);
setenv("MCPI_USERNAME", get_motd().c_str(), 1);
}