602 lines
22 KiB
C++
602 lines
22 KiB
C++
// Config Needs To Load First
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#include <libreborn/libreborn.h>
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#ifndef MCPI_SERVER_MODE
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#error "Server Code Requires Server Mode"
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#endif
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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 <fstream>
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#include <vector>
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#include <sys/ioctl.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <SDL/SDL.h>
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#include <symbols/minecraft.h>
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#include <mods/server/server_properties.h>
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#include <mods/feature/feature.h>
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#include <mods/init/init.h>
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#include <mods/home/home.h>
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#include <mods/compat/compat.h>
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#include <mods/misc/misc.h>
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// --only-generate: Ony Generate World And Then Exit
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static bool only_generate = false;
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__attribute__((constructor)) static void _init_only_generate(int argc, char *argv[]) {
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// Iterate Arguments
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for (int i = 1; i < argc; i++) {
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// Check Argument
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if (strcmp(argv[i], "--only-generate") == 0) {
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// Enabled
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only_generate = true;
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break;
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}
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}
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}
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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_SHOW_MINECON_BADGE "false"
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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_FORCE_MOB_SPAWNING "false"
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#define DEFAULT_PEACEFUL_MODE "false"
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#define DEFAULT_WORLD_NAME "world"
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#define DEFAULT_MAX_PLAYERS "4"
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#define DEFAULT_WHITELIST "false"
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#define DEFAULT_DEATH_MESSAGES "false"
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// Get World Name
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static std::string get_world_name() {
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std::string name = get_server_properties().get_string("world-name", DEFAULT_WORLD_NAME);
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char *safe_name_c = to_cp437(name.c_str());
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std::string safe_name = safe_name_c;
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free(safe_name_c);
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return safe_name;
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}
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// Create/Start World
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static void start_world(unsigned char *minecraft) {
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// Get World Name
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std::string world_name = get_world_name();
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// Log
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INFO("Loading World: %s", world_name.c_str());
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// Peaceful Mode
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unsigned char *options = minecraft + Minecraft_options_property_offset;
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*(int32_t *) (options + Options_game_difficulty_property_offset) = get_server_properties().get_bool("peaceful-mode", DEFAULT_PEACEFUL_MODE) ? 0 : 2;
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// Specify Level Settings
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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);
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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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// Select Level
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(*Minecraft_selectLevel)(minecraft, world_name, world_name, settings);
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// Don't Open Port When Using --only-generate
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if (!only_generate) {
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// Open Port
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int port = get_server_properties().get_int("port", DEFAULT_PORT);
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INFO("Listening On: %i", port);
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(*Minecraft_hostMultiplayer)(minecraft, port);
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}
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// Open ProgressScreen
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unsigned char *screen = (unsigned char *) ::operator new(PROGRESS_SCREEN_SIZE);
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ALLOC_CHECK(screen);
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screen = (*ProgressScreen)(screen);
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(*Minecraft_setScreen)(minecraft, screen);
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}
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// Check If Running In Whitelist Mode
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static bool is_whitelist() {
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return get_server_properties().get_bool("whitelist", DEFAULT_WHITELIST);
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}
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// Get Path Of Blacklist (Or Whitelist) File
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static std::string get_blacklist_file() {
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std::string file(home_get());
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file.append(is_whitelist() ? "/whitelist.txt" : "/blacklist.txt");
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return file;
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}
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// Get Vector Of Players In Level
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static std::vector<unsigned char *> get_players_in_level(unsigned char *level) {
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return *(std::vector<unsigned char *> *) (level + Level_players_property_offset);
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}
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// Get Player's Username
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static std::string get_player_username(unsigned char *player) {
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std::string *username = (std::string *) (player + Player_username_property_offset);
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char *safe_username_c = from_cp437(username->c_str());
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std::string safe_username = safe_username_c;
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free(safe_username_c);
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return safe_username;
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}
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// Get Level From Minecraft
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static unsigned char *get_level(unsigned char *minecraft) {
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return *(unsigned char **) (minecraft + Minecraft_level_property_offset);
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}
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// Find Players With Username And Run Callback
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typedef void (*player_callback_t)(unsigned char *minecraft, std::string username, unsigned char *player);
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static void find_players(unsigned char *minecraft, std::string target_username, player_callback_t callback, bool all_players) {
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unsigned char *level = get_level(minecraft);
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std::vector<unsigned char *> players = get_players_in_level(level);
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bool found_player = false;
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for (std::size_t i = 0; i < players.size(); i++) {
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// Iterate Players
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unsigned char *player = players[i];
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std::string username = get_player_username(player);
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if (all_players || username == target_username) {
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// Run Callback
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(*callback)(minecraft, username, player);
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found_player = true;
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}
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}
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if (!all_players && !found_player) {
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INFO("Invalid Player: %s", target_username.c_str());
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}
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}
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// Get RakNet Objects
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static RakNet_RakNetGUID get_rak_net_guid(unsigned char *player) {
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return *(RakNet_RakNetGUID *) (player + ServerPlayer_guid_property_offset);
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}
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static RakNet_SystemAddress get_system_address(unsigned char *rak_peer, RakNet_RakNetGUID guid) {
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unsigned char *rak_peer_vtable = *(unsigned char **) rak_peer;
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RakNet_RakPeer_GetSystemAddressFromGuid_t RakNet_RakPeer_GetSystemAddressFromGuid = *(RakNet_RakPeer_GetSystemAddressFromGuid_t *) (rak_peer_vtable + RakNet_RakPeer_GetSystemAddressFromGuid_vtable_offset);
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// Get SystemAddress
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return (*RakNet_RakPeer_GetSystemAddressFromGuid)(rak_peer, guid);
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}
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static unsigned char *get_rak_peer(unsigned char *minecraft) {
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unsigned char *rak_net_instance = *(unsigned char **) (minecraft + Minecraft_rak_net_instance_property_offset);
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return *(unsigned char **) (rak_net_instance + RakNetInstance_peer_property_offset);
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}
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static char *get_rak_net_guid_ip(unsigned char *rak_peer, RakNet_RakNetGUID guid) {
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RakNet_SystemAddress address = get_system_address(rak_peer, guid);
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// Get IP
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return (*RakNet_SystemAddress_ToString)(&address, false, '|');
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}
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// Get IP From Player
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static char *get_player_ip(unsigned char *minecraft, unsigned char *player) {
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unsigned char *rak_peer = get_rak_peer(minecraft);
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RakNet_RakNetGUID guid = get_rak_net_guid(player);
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// Return
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return get_rak_net_guid_ip(rak_peer,guid);
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}
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// Ban Player
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static bool is_ip_in_blacklist(const char *ip);
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static void ban_callback(unsigned char *minecraft, std::string username, unsigned char *player) {
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// Get IP
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char *ip = get_player_ip(minecraft, player);
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// Ban Player
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INFO("Banned: %s (%s)", username.c_str(), ip);
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// Write To File
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std::ofstream blacklist_output(get_blacklist_file(), std::ios_base::app);
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if (blacklist_output) {
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if (blacklist_output.good()) {
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blacklist_output << "# " << username << '\n' << ip << '\n';
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}
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if (blacklist_output.is_open()) {
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blacklist_output.close();
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}
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}
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// Reload
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is_ip_in_blacklist(NULL);
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}
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// Kill Player
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static void kill_callback(__attribute__((unused)) unsigned char *minecraft, __attribute__((unused)) std::string username, unsigned char *player) {
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unsigned char *player_vtable = *(unsigned char **) player;
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Mob_actuallyHurt_t Player_actuallyHurt = *(Mob_actuallyHurt_t *) (player_vtable + Mob_actuallyHurt_vtable_offset);
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(*Player_actuallyHurt)(player, INT32_MAX);
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INFO("Killed: %s", username.c_str());
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}
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// List Player
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static void list_callback(unsigned char *minecraft, std::string username, unsigned char *player) {
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INFO(" - %s (%s)", username.c_str(), get_player_ip(minecraft, player));
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}
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// Handle Server Stop
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static void handle_server_stop(unsigned char *minecraft) {
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if (compat_check_exit_requested()) {
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INFO("Stopping Server");
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// Save And Exit
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unsigned char *level = get_level(minecraft);
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if (level != NULL) {
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Level_saveLevelData_injection(level);
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}
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(*Minecraft_leaveGame)(minecraft, false);
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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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}
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// Track TPS
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#define NANOSECONDS_IN_SECOND 1000000000ll
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static long long int get_time() {
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
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long long int a = (long long int) ts.tv_nsec;
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long long int b = ((long long int) ts.tv_sec) * NANOSECONDS_IN_SECOND;
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return a + b;
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}
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static bool is_last_tick_time_set = false;
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static long long int last_tick_time;
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static double tps = 0;
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static void Minecraft_tick_injection(__attribute__((unused)) unsigned char *minecraft) {
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long long int time = get_time();
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if (is_last_tick_time_set) {
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long long int tick_time = time - last_tick_time;
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tps = ((double) NANOSECONDS_IN_SECOND) / ((double) tick_time);
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} else {
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is_last_tick_time_set = true;
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}
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last_tick_time = time;
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}
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// Get ServerSideNetworkHandler From Minecraft
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static unsigned char *get_server_side_network_handler(unsigned char *minecraft) {
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return *(unsigned char **) (minecraft + Minecraft_network_handler_property_offset);
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}
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// Read STDIN Thread
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static volatile bool stdin_buffer_complete = false;
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static volatile char *stdin_buffer = NULL;
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static void *read_stdin_thread(__attribute__((unused)) void *data) {
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// Loop
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while (1) {
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int bytes_available;
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if (ioctl(fileno(stdin), FIONREAD, &bytes_available) == -1) {
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bytes_available = 0;
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}
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char buffer[bytes_available];
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bytes_available = read(fileno(stdin), (void *) buffer, bytes_available);
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for (int i = 0; i < bytes_available; i++) {
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if (!stdin_buffer_complete) {
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// Read Data
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char x = buffer[i];
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if (x == '\n') {
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if (stdin_buffer == NULL) {
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stdin_buffer = (volatile char *) malloc(1);
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stdin_buffer[0] = '\0';
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}
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stdin_buffer_complete = true;
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} else {
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string_append((char **) &stdin_buffer, "%c", (char) x);
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}
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}
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}
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}
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return NULL;
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}
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__attribute__((destructor)) static void _free_stdin_buffer() {
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if (stdin_buffer != NULL) {
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free((void *) stdin_buffer);
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stdin_buffer = NULL;
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}
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}
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// Handle Commands
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static void handle_commands(unsigned char *minecraft) {
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// Check If Level Is Generated
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if ((*Minecraft_isLevelGenerated)(minecraft) && stdin_buffer_complete) {
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// Command Ready; Run It
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if (stdin_buffer != NULL) {
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unsigned char *server_side_network_handler = get_server_side_network_handler(minecraft);
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if (server_side_network_handler != NULL) {
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std::string data((char *) stdin_buffer);
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static std::string ban_command("ban ");
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static std::string say_command("say ");
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static std::string kill_command("kill ");
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static std::string list_command("list");
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static std::string reload_command("reload");
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static std::string tps_command("tps");
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static std::string stop_command("stop");
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static std::string help_command("help");
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if (!is_whitelist() && data.rfind(ban_command, 0) == 0) {
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// IP-Ban Target Username
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std::string ban_username = data.substr(ban_command.length());
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find_players(minecraft, ban_username, ban_callback, false);
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} else if (data == reload_command) {
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INFO("Reloading %s", is_whitelist() ? "Whitelist" : "Blacklist");
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is_ip_in_blacklist(NULL);
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} else if (data.rfind(kill_command, 0) == 0) {
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// Kill Target Username
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std::string kill_username = data.substr(kill_command.length());
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find_players(minecraft, kill_username, kill_callback, false);
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} else if (data.rfind(say_command, 0) == 0) {
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// Format Message
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std::string message = "[Server] " + data.substr(say_command.length());
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char *safe_message = to_cp437(message.c_str());
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// Post Message To Chat
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(*ServerSideNetworkHandler_displayGameMessage)(server_side_network_handler, safe_message);
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// Free
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free(safe_message);
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} else if (data == list_command) {
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// List Players
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INFO("All Players:");
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find_players(minecraft, "", list_callback, true);
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} else if (data == tps_command) {
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// Print TPS
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INFO("TPS: %f", tps);
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} else if (data == stop_command) {
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// Stop Server
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compat_request_exit();
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} else if (data == help_command) {
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INFO("All Commands:");
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if (!is_whitelist()) {
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INFO(" ban <Username> - IP-Ban All Players With Specifed Username");
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}
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INFO(" reload - Reload The %s", is_whitelist() ? "Whitelist" : "Blacklist");
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INFO(" kill <Username> - Kill All Players With Specifed Username");
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INFO(" say <Message> - Print Specified Message To Chat");
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INFO(" list - List All Players");
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INFO(" tps - Print TPS");
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INFO(" stop - Stop Server");
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INFO(" help - Print This Message");
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} else {
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INFO("Invalid Command: %s", data.c_str());
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}
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}
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// Free
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free((void *) stdin_buffer);
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stdin_buffer = NULL;
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}
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stdin_buffer_complete = false;
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}
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}
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// Runs Every Tick
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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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start_world(minecraft);
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loaded = true;
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}
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// Handle --only-generate
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if (only_generate && (*Minecraft_isLevelGenerated)(minecraft)) {
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// Request Exit
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compat_request_exit();
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// Disable Special Behavior After Requesting Exit
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only_generate = false;
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}
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// Handle Commands
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handle_commands(minecraft);
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// Server Stop
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handle_server_stop(minecraft);
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}
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// Check Blacklist/Whitelist
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static bool is_ip_in_blacklist(const char *ip) {
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static std::vector<std::string> ips;
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if (ip == NULL) {
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// Reload
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ips.clear();
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// Check banned-ips.txt
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std::string blacklist_file_path = get_blacklist_file();
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std::ifstream blacklist_file(blacklist_file_path);
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if (blacklist_file) {
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if (blacklist_file.good()) {
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std::string line;
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while (std::getline(blacklist_file, line)) {
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// Check Line
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if (line.length() > 0 && line[0] != '#') {
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ips.push_back(line);
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}
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}
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}
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if (blacklist_file.is_open()) {
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blacklist_file.close();
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}
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} else {
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ERR("Unable To Read Blacklist/Whitelist");
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}
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return false;
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} else {
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// Check List
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for (std::string &x : ips) {
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if (x.compare(ip) == 0) {
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return true;
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}
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}
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return false;
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}
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}
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// Ban Players
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static bool RakNet_RakPeer_IsBanned_injection(__attribute__((unused)) unsigned char *rakpeer, const char *ip) {
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// Check List
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bool ret = is_ip_in_blacklist(ip);
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if (is_whitelist()) {
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return !ret;
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} else {
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return ret;
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}
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}
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// Log IPs
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static unsigned char *ServerSideNetworkHandler_onReady_ClientGeneration_ServerSideNetworkHandler_popPendingPlayer_injection(unsigned char *server_side_network_handler, RakNet_RakNetGUID *guid) {
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// Call Original Method
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unsigned char *player = (*ServerSideNetworkHandler_popPendingPlayer)(server_side_network_handler, guid);
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// Check If Player Is Null
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if (player != NULL) {
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// Get Data
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std::string *username = (std::string *) (player + Player_username_property_offset);
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unsigned char *minecraft = *(unsigned char **) (server_side_network_handler + ServerSideNetworkHandler_minecraft_property_offset);
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unsigned char *rak_peer = get_rak_peer(minecraft);
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char *ip = get_rak_net_guid_ip(rak_peer, *guid);
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// Log
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INFO("%s Has Joined (IP: %s)", username->c_str(), ip);
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}
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// Return
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return player;
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}
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// Get MOTD
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static std::string get_motd() {
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std::string motd(get_server_properties().get_string("motd", DEFAULT_MOTD));
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return motd;
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}
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// Get Feature Flags
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static bool loaded_features = false;
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static const char *get_features() {
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static std::string features;
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if (!loaded_features) {
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loaded_features = true;
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features.clear();
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if (get_server_properties().get_bool("force-mob-spawning", DEFAULT_FORCE_MOB_SPAWNING)) {
|
|
features += "Force Mob Spawning|";
|
|
}
|
|
if (get_server_properties().get_bool("death-messages", DEFAULT_DEATH_MESSAGES)) {
|
|
features += "Implement Death Messages|";
|
|
}
|
|
}
|
|
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);
|
|
|
|
// Check Properties 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 << "# Enable Death Messages\n";
|
|
properties_file_output << "death-messages=" DEFAULT_DEATH_MESSAGES "\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();
|
|
}
|
|
// Load Blacklist/Whitelist
|
|
is_ip_in_blacklist(NULL);
|
|
|
|
// 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
|
|
misc_run_on_update(Minecraft_update_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);
|
|
|
|
// Track TPS
|
|
misc_run_on_tick(Minecraft_tick_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();
|
|
set_and_print_env("MCPI_FEATURE_FLAGS", get_features());
|
|
set_and_print_env("MCPI_RENDER_DISTANCE", "Tiny");
|
|
set_and_print_env("MCPI_USERNAME", get_motd().c_str());
|
|
}
|