minecraft-pi-reborn/mods/src/server/server.cpp
2021-02-17 11:31:01 -05:00

499 lines
18 KiB
C++

#include <string>
#include <stdint.h>
#include <ctime>
#include <cstdio>
#include <csignal>
#include <fstream>
#include <vector>
#include <pthread.h>
#include <unistd.h>
#include <SDL/SDL_events.h>
#include <libreborn/libreborn.h>
#include "server_internal.h"
#include "server_properties.h"
#include "../feature/feature.h"
#include "../init/init.h"
#include <libreborn/minecraft.h>
// 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_MOB_SPAWNING "true"
#define DEFAULT_PEACEFUL_MODE "false"
#define DEFAULT_WORLD_NAME "world"
#define DEFAULT_MAX_PLAYERS "4"
// Read STDIN Thread
static volatile bool stdin_buffer_complete = false;
static volatile char *stdin_buffer = NULL;
static void *read_stdin_thread(__attribute__((unused)) void *data) {
while (1) {
if (!stdin_buffer_complete) {
int x = getchar();
if (x != EOF) {
if (x == '\n') {
if (stdin_buffer == NULL) {
stdin_buffer = strdup("");
}
stdin_buffer_complete = true;
} else {
asprintf((char **) &stdin_buffer, "%s%c", stdin_buffer == NULL ? "" : stdin_buffer, (char) x);
ALLOC_CHECK(stdin_buffer);
}
}
}
}
}
// Get World Name
std::string server_internal_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("%s", "Starting Minecraft: Pi Edition Dedicated Server");
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;
std::string world_name = server_internal_get_world_name();
(*Minecraft_selectLevel)(minecraft, world_name, world_name, settings);
int port = get_server_properties().get_int("port", DEFAULT_PORT);
(*Minecraft_hostMultiplayer)(minecraft, port);
INFO("Listening On: %i", port);
void *screen = ::operator new(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;
}
}
}
}
static std::string get_banned_ips_file() {
std::string file(getenv("HOME"));
file.append("/.minecraft-pi/banned-ips.txt");
return file;
}
typedef void (*player_callback_t)(unsigned char *minecraft, std::string username, unsigned char *player);
// Get Vector Of Players In Level
std::vector<unsigned char *> server_internal_get_players(unsigned char *level) {
return *(std::vector<unsigned char *> *) (level + Level_players_property_offset);
}
// Get Player's Username
std::string server_internal_get_player_username(unsigned char *player) {
return *(char **) (player + Player_username_property_offset);
}
// Get Level From Minecraft
unsigned char *server_internal_get_level(unsigned char *minecraft) {
return *(unsigned char **) (minecraft + Minecraft_level_property_offset);
}
// Get minecraft from ServerPlayer
unsigned char *server_internal_get_minecraft(unsigned char *player) {
return *(unsigned char **) (player + ServerPlayer_minecraft_property_offset);
}
// Find Players With Username And Run Callback
static void find_players(unsigned char *minecraft, std::string target_username, player_callback_t callback, bool all_players) {
unsigned char *level = server_internal_get_level(minecraft);
std::vector<unsigned char *> players = server_internal_get_players(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 = server_internal_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());
}
}
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);
}
// Get IP From Player
static char *get_player_ip(unsigned char *minecraft, unsigned char *player) {
RakNet_RakNetGUID guid = get_rak_net_guid(player);
unsigned char *rak_peer = get_rak_peer(minecraft);
RakNet_SystemAddress address = get_system_address(rak_peer, guid);
// Get IP
return (*RakNet_SystemAddress_ToString)(&address, false, '|');
}
// 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 banned_ips_output(get_banned_ips_file(), std::ios_base::app);
if (banned_ips_output) {
if (banned_ips_output.good()) {
banned_ips_output << ip <<'\n';
}
if (banned_ips_output.is_open()) {
banned_ips_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;
Entity_die_t Entity_die = *(Entity_die_t *) (player_vtable + Entity_die_vtable_offset);
(*Entity_die)(player, NULL);
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));
}
static void Level_saveLevelData_injection(unsigned char *level) {
// Print Log Message
INFO("%s", "Saving Game");
// Call Original Method
(*Level_saveLevelData)(level);
}
// Stop Server
static bool exit_requested = false;
static void exit_handler(__attribute__((unused)) int data) {
exit_requested = true;
}
static void handle_server_stop(unsigned char *minecraft) {
if (exit_requested) {
INFO("%s", "Stopping Server");
// Save And Exit
unsigned char *level = server_internal_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);
exit_requested = false;
}
}
// Get ServerSideNetworkHandler From Minecraft
static unsigned char *get_server_side_network_handler(unsigned char *minecraft) {
return *(unsigned char **) (minecraft + Minecraft_network_handler_property_offset);
}
// Handle Commands
static void handle_commands(unsigned char *minecraft) {
if ((*Minecraft_isLevelGenerated)(minecraft) && stdin_buffer_complete) {
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 (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
exit_handler(-1);
} else if (data == help_command) {
INFO("%s", "All Commands:");
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((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;
}
// Print Progress Reports
print_progress(minecraft);
// Call Original Method
(*Minecraft_update)(minecraft);
// Handle Commands
handle_commands(minecraft);
// Server Stop
handle_server_stop(minecraft);
}
static bool RakNet_RakPeer_IsBanned_injection(__attribute__((unused)) unsigned char *rakpeer, const char *ip) {
// Check banned-ips.txt
std::string banned_ips_file_path = get_banned_ips_file();
std::ifstream banned_ips_file(banned_ips_file_path);
if (banned_ips_file) {
bool ret = false;
if (banned_ips_file.good()) {
std::string line;
while (std::getline(banned_ips_file, line)) {
if (line.length() > 0) {
if (line[0] == '#') {
continue;
}
if (strcmp(line.c_str(), ip) == 0) {
ret = true;
break;
}
}
}
}
if (banned_ips_file.is_open()) {
banned_ips_file.close();
}
return ret;
} else {
ERR("%s", "Unable To Read banned-ips.txt");
}
}
static std::string get_motd() {
std::string motd(get_server_properties().get_string("motd", DEFAULT_MOTD));
return motd;
}
static bool loaded_features = false;
static const char *get_features() {
static std::string features;
if (!loaded_features) {
loaded_features = true;
features = "";
if (get_server_properties().get_bool("spawn-mobs", DEFAULT_MOB_SPAWNING)) {
features += "Mob Spawning|";
}
if (get_server_properties().get_bool("peaceful-mode", DEFAULT_PEACEFUL_MODE)) {
features += "Peaceful Mode|";
}
}
return features.c_str();
}
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(getenv("HOME"));
file.append("/.minecraft-pi/server.properties");
std::ifstream properties_file(file);
if (!properties_file || !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 << "# Mob Spawning (false = Disabled, true = Enabled)\n";
properties_file_output << "spawn-mobs=" DEFAULT_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.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
overwrite_calls((void *) Minecraft_update, (void *) Minecraft_update_injection);
// Print Log On Game Save
overwrite_calls((void *) Level_saveLevelData, (void *) Level_saveLevelData_injection);
// Exit handler
signal(SIGINT, exit_handler);
signal(SIGTERM, exit_handler);
// Set Max Players
unsigned char max_players_patch[4] = {get_max_players(), 0x30, 0xa0, 0xe3};
patch((void *) 0x166d0, max_players_patch);
// Custom Banned IP List
overwrite((void *) RakNet_RakPeer_IsBanned, (void *) RakNet_RakPeer_IsBanned_injection);
if (get_server_properties().get_bool("show-minecon-badge", DEFAULT_SHOW_MINECON_BADGE)) {
// Show The MineCon Icon Next To MOTD In Server List
unsigned char minecon_badge_patch[4] = {0x04, 0x1a, 0x9f, 0xe5};
patch((void *) 0x737e4, minecon_badge_patch);
}
// Start Reading STDIN
pthread_t read_stdin_thread_obj;
pthread_create(&read_stdin_thread_obj, NULL, read_stdin_thread, NULL);
}
void init_server() {
if (feature_get_mode() == 2) {
server_init();
setenv("MCPI_FEATURES", get_features(), 1);
setenv("MCPI_USERNAME", get_motd().c_str(), 1);
}
}