531 lines
20 KiB
C++
531 lines
20 KiB
C++
#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 <vector>
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#include <pthread.h>
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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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// 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_ICON "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_MOB_SPAWNING "true"
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#define DEFAULT_WORLD_NAME "world"
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#define DEFAULT_MAX_PLAYERS "4"
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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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while (1) {
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if (!stdin_buffer_complete) {
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int x = getchar();
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if (x != EOF) {
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if (x == '\n') {
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if (stdin_buffer == NULL) {
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stdin_buffer = strdup("");
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}
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stdin_buffer_complete = true;
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} else {
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if (stdin_buffer == NULL) {
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asprintf((char **) &stdin_buffer, "%c", (char) x);
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} else {
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asprintf((char **) &stdin_buffer, "%s%c", stdin_buffer, (char) x);
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}
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}
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}
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}
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}
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}
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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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// Create/Start World
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static void start_world(unsigned char *minecraft) {
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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 = 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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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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}
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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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// Print Progress Reports
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static int last_progress = -1;
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static const char *last_message = NULL;
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static void print_progress(unsigned char *minecraft) {
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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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}
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struct RakNet_RakNetGUID {
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unsigned char data[10];
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};
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struct RakNet_SystemAddress {
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unsigned char data[20];
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};
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typedef RakNet_SystemAddress (*RakNet_RakPeer_GetSystemAddressFromGuid_t)(unsigned char *rak_peer, RakNet_RakNetGUID guid);
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typedef void (*ServerSideNetworkHandler_displayGameMessage_t)(unsigned char *server_side_network_handler, std::string const& message);
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static ServerSideNetworkHandler_displayGameMessage_t ServerSideNetworkHandler_displayGameMessage = (ServerSideNetworkHandler_displayGameMessage_t) 0x750c4;
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typedef char *(*RakNet_SystemAddress_ToString_t)(RakNet_SystemAddress *system_address, bool print_delimiter, char delimiter);
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static RakNet_SystemAddress_ToString_t RakNet_SystemAddress_ToString = (RakNet_SystemAddress_ToString_t) 0xd6198;
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static std::string get_banned_ips_file() {
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std::string file(getenv("HOME"));
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file.append("/.minecraft/banned-ips.txt");
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return file;
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}
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typedef void (*player_callback_t)(unsigned char *minecraft, std::string username, unsigned char *player);
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// Find Players With Username And Run Callback
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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 = *(unsigned char **) (minecraft + 0x188);
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std::vector<unsigned char *> players = *(std::vector<unsigned char *> *) (level + 0x60);
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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 = *(std::string *) (player + 0xbf4);
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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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static RakNet_RakNetGUID *get_rak_net_guid(unsigned char *player) {
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return (RakNet_RakNetGUID *) (player + 0xc08);
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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 + 0xd0);
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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 + 0x170);
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return *(unsigned char **) (rak_net_instance + 0x4);
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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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RakNet_RakNetGUID guid = *get_rak_net_guid(player);
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unsigned char *rak_peer = get_rak_peer(minecraft);
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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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// Ban Player
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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 banned_ips_output(get_banned_ips_file(), std::ios_base::app);
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if (banned_ips_output) {
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if (banned_ips_output.good()) {
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banned_ips_output << ip <<'\n';
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}
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if (banned_ips_output.is_open()) {
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banned_ips_output.close();
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}
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}
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}
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// Kill Player
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typedef void (*Entity_die_t)(unsigned char *entity, unsigned char *cause);
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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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Entity_die_t Entity_die = *(Entity_die_t *) (player_vtable + 0x130);
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(*Entity_die)(player, NULL);
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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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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 (*Minecraft_leaveGame_t)(unsigned char *minecraft, bool save_remote_level);
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static Minecraft_leaveGame_t Minecraft_leaveGame = (Minecraft_leaveGame_t) 0x15ea0;
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// Stop Server
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static bool exit_requested = false;
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static void exit_handler(__attribute__((unused)) int data) {
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exit_requested = true;
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}
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static void handle_server_stop(unsigned char *minecraft) {
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if (exit_requested) {
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INFO("%s", "Stopping Server");
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// Save And Exit
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unsigned char *level = *(unsigned char **) (minecraft + 0x188);
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(*Level_saveLevelData)(level);
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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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exit_requested = false;
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}
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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 + 0x174);
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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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if ((*Minecraft_isLevelGenerated)(minecraft) && stdin_buffer_complete) {
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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 stop_command("stop");
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static std::string help_command("help");
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if (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.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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// Post Message To Chat
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(*ServerSideNetworkHandler_displayGameMessage)(server_side_network_handler, message);
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} else if (data == list_command) {
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// List Players
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INFO("%s", "All Players:");
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find_players(minecraft, "", list_callback, true);
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} else if (data == stop_command) {
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// Stop Server
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exit_handler(-1);
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} else if (data == help_command) {
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INFO("%s", "All Commands:");
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INFO("%s", " ban <Username> - IP-Ban All Players With Specifed Username");
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INFO("%s", " kill <Username> - Kill All Players With Specifed Username");
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INFO("%s", " say <Message> - Print Specified Message To Chat");
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INFO("%s", " list - List All Players");
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INFO("%s", " stop - Stop Server");
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INFO("%s", " 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((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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// Print Progress Reports
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print_progress(minecraft);
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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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// 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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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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fprintf(stderr, "[CHAT]: %s\n", text.c_str());
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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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typedef bool (*RakNet_RakPeer_IsBanned_t)(unsigned char *rakpeer, const char *ip);
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static RakNet_RakPeer_IsBanned_t RakNet_RakPeer_IsBanned = (RakNet_RakPeer_IsBanned_t) 0xda3b4;
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static void *RakNet_RakPeer_IsBanned_original = NULL;
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static bool RakNet_RakPeer_IsBanned_injection(unsigned char *rakpeer, const char *ip) {
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// Call Original
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revert_overwrite((void *) RakNet_RakPeer_IsBanned, RakNet_RakPeer_IsBanned_original);
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bool ret = (*RakNet_RakPeer_IsBanned)(rakpeer, ip);
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revert_overwrite((void *) RakNet_RakPeer_IsBanned, RakNet_RakPeer_IsBanned_original);
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if (ret) {
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return true;
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} else {
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// Check banned-ips.txt
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std::string banned_ips_file_path = get_banned_ips_file();
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std::ifstream banned_ips_file(banned_ips_file_path);
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if (banned_ips_file) {
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bool ret = false;
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if (banned_ips_file.good()) {
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std::string line;
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while (std::getline(banned_ips_file, line)) {
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if (line.length() > 0) {
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if (line[0] == '#') {
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continue;
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}
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if (strcmp(line.c_str(), ip) == 0) {
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ret = true;
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break;
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}
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}
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}
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}
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if (banned_ips_file.is_open()) {
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banned_ips_file.close();
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}
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return ret;
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} else {
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ERR("%s", "Unable To Read banned-ips.txt");
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}
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}
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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_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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static unsigned char server_get_max_players() {
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int val = get_server_properties().get_int("max-players", DEFAULT_MAX_PLAYERS);
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if (val < 0) {
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val = 0;
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}
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if (val > 255) {
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val = 255;
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}
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return (unsigned char) val;
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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.good()) {
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// Write Defaults
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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 << "# Show The MineCon Icon Next To MOTD In Server List\n";
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properties_file_output << "show-minecon-icon=" DEFAULT_SHOW_MINECON_ICON "\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";
|
|
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 << "# Mob Spawning (false = Disabled, true = Enabled)\n";
|
|
properties_file_output << "spawn-mobs=" DEFAULT_MOB_SPAWNING "\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.close();
|
|
// Re-Open File
|
|
properties_file = std::ifstream(file);
|
|
}
|
|
|
|
if (!properties_file.is_open()) {
|
|
ERR("%s", "Unable To Open server.properties");
|
|
}
|
|
|
|
// Load Properties
|
|
get_server_properties().load(properties_file);
|
|
|
|
properties_file.close();
|
|
|
|
// Create Empty Banned IPs File
|
|
std::string banned_ips_file_path = get_banned_ips_file();
|
|
std::ifstream banned_ips_file(banned_ips_file_path);
|
|
if (!banned_ips_file || !banned_ips_file.good()) {
|
|
// Write Default
|
|
std::ofstream banned_ips_output(banned_ips_file_path);
|
|
banned_ips_output << "# List Of Banned IPs; Each Line Is One IP Address\n";
|
|
banned_ips_output.close();
|
|
}
|
|
if (banned_ips_file.is_open()) {
|
|
banned_ips_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
|
|
unsigned char allow_all_ip_patch[4] = {0x00, 0xf0, 0x20, 0xe3};
|
|
patch((void *) 0xe1f6c, allow_all_ip_patch);
|
|
// Set Max Players
|
|
unsigned char max_players_patch[4] = {server_get_max_players(), 0x30, 0xa0, 0xe3};
|
|
patch((void *) 0x166d0, max_players_patch);
|
|
// Custom Banned IP List
|
|
RakNet_RakPeer_IsBanned_original = overwrite((void *) RakNet_RakPeer_IsBanned, (void *) RakNet_RakPeer_IsBanned_injection);
|
|
|
|
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};
|
|
patch((void *) 0x737e4, minecon_icon_patch);
|
|
}
|
|
|
|
// Start Reading STDIN
|
|
pthread_t read_stdin_thread_obj;
|
|
pthread_create(&read_stdin_thread_obj, NULL, read_stdin_thread, NULL);
|
|
}
|