Add Dedicated Server

Dockerfile.client

@@ -1,4 +1,4 @@
-FROM arm64v8/debian:bullseye
+FROM debian:bullseye
 
 RUN dpkg --add-architecture armhf
 

Dockerfile.server

@@ -0,0 +1,7 @@
+FROM thebrokenrail/minecraft-pi:client
+
+ENV MCPI_SERVER=1
+
+RUN apt-get install -y xvfb
+
+ENTRYPOINT xvfb-run ./launcher

debian/client/DEBIAN/postinst

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -e
+
+docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+
+MCPI_FEATURES='' MCPI_USERNAME='' docker-compose -f /usr/share/minecraft-pi/client/docker-compose.yml pull

debian/client/usr/bin/minecraft-pi

@@ -26,10 +26,9 @@ fi
 xhost local:root
 
 # Launch Minecraft
-DOCKER_COMPOSE="docker-compose -f /usr/share/minecraft-pi/docker-compose.yml"
-${DOCKER_COMPOSE} pull | zenity --class 'Minecraft - Pi edition' --progress --pulsate --no-cancel --auto-close --text 'Updating Minecraft...'
-${DOCKER_COMPOSE} up
-${DOCKER_COMPOSE} down
+DOCKER_COMPOSE="docker-compose -f /usr/share/minecraft-pi/client/docker-compose.yml"
+(${DOCKER_COMPOSE} pull || :) | zenity --class 'Minecraft - Pi edition' --progress --pulsate --no-cancel --auto-close --text 'Updating Minecraft...'
+${DOCKER_COMPOSE} run --rm minecraft-pi || :
 
 # Kill VirGL
 kill "${VIRGL_PID}"

debian/client/usr/share/minecraft-pi/client/docker-compose.yml

@@ -1,7 +1,7 @@
 version: '3.7'
 services:
     minecraft-pi:
-        image: thebrokenrail/minecraft-pi
+        image: 'thebrokenrail/minecraft-pi:client'
         network_mode: 'host'
         volumes:
             - '/tmp/.X11-unix:/tmp/.X11-unix'

debian/server/DEBIAN/control

@@ -0,0 +1,7 @@
+Package: minecraft-pi-server
+Version: 1.0.0
+Maintainer: TheBrokenRail <connor24nolan@live.com>
+Description: Fun with Blocks
+Homepage: https://www.minecraft.net/en-us/edition/pi
+Architecture: amd64
+Depends: docker.io, docker-compose

debian/server/DEBIAN/postinst

@@ -4,4 +4,4 @@ set -e
 
 docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
 
-MCPI_FEATURES='' docker-compose -f /usr/share/minecraft-pi/docker-compose.yml pull
+MCPI_ROOT='' docker-compose -f /usr/share/minecraft-pi/server/docker-compose.yml pull

debian/server/usr/bin/minecraft-pi-server

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -e
+
+export MCPI_ROOT="${PWD}"
+
+# Launch Minecraft
+DOCKER_COMPOSE="docker-compose -f /usr/share/minecraft-pi/server/docker-compose.yml"
+${DOCKER_COMPOSE} pull || :
+${DOCKER_COMPOSE} run --rm minecraft-pi

debian/server/usr/share/minecraft-pi/server/docker-compose.yml

@@ -0,0 +1,7 @@
+version: '3.7'
+services:
+    minecraft-pi:
+        image: 'thebrokenrail/minecraft-pi:server'
+        network_mode: 'host'
+        volumes:
+            - '${MCPI_ROOT}:/root/.minecraft'

mods/CMakeLists.txt

@@ -3,6 +3,7 @@ cmake_minimum_required(VERSION 3.1.0)
 project(mods)
 
 add_compile_options(-Wall -Wextra -Werror)
+add_definitions(-D_GLIBCXX_USE_CXX11_ABI=0)
 
 add_subdirectory(../core core)
 
@@ -11,8 +12,11 @@ include_directories(include)
 add_library(core SHARED src/core.c)
 target_link_libraries(core dl)
 
-add_library(extra SHARED src/extra.c src/extra.cpp)
-target_link_libraries(extra core dl)
+add_library(server SHARED src/server/server.cpp src/server/server_properties.cpp)
+target_link_libraries(server core dl SDL)
+
+add_library(extra SHARED src/extra.c src/extra.cpp src/cxx11_util.cpp)
+target_link_libraries(extra core dl server)
 
 find_package(glfw3 3.3 REQUIRED)
 

mods/src/compat.c

@@ -28,6 +28,8 @@ static Window x11_window;
 static Window x11_root_window;
 static int window_loaded = 0;
 
+static int is_server = 0;
+
 // Get Reference To X Window
 static void store_x11_window() {
     x11_display = glfwGetX11Display();
@@ -184,10 +186,17 @@ HOOK(SDL_WM_SetCaption, void, (const char *title, __attribute__((unused)) const
         exit(1);
     }
 
-    glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 1);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
-    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    if (is_server) {
+        // Don't Show Window In Server Mode
+        glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
+        glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
+    } else {
+        // Create OpenGL ES 1.1 Context
+        glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 1);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
+        glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    }
 
     glfw_window = glfwCreateWindow(840, 480, title, NULL, NULL);
     if (!glfw_window) {
@@ -195,19 +204,27 @@ HOOK(SDL_WM_SetCaption, void, (const char *title, __attribute__((unused)) const
         exit(1);
     }
 
-    glfwSetKeyCallback(glfw_window, glfw_key);
-    glfwSetCharCallback(glfw_window, glfw_char);
-    glfwSetCursorPosCallback(glfw_window, glfw_motion);
-    glfwSetMouseButtonCallback(glfw_window, glfw_click);
-    glfwSetScrollCallback(glfw_window, glfw_scroll);
+    if (!is_server) {
+        // Don't Process Events In Server Mode
+        glfwSetKeyCallback(glfw_window, glfw_key);
+        glfwSetCharCallback(glfw_window, glfw_char);
+        glfwSetCursorPosCallback(glfw_window, glfw_motion);
+        glfwSetMouseButtonCallback(glfw_window, glfw_click);
+        glfwSetScrollCallback(glfw_window, glfw_scroll);
+    }
 
     store_x11_window();
 
-    glfwMakeContextCurrent(glfw_window);
+    if (!is_server) {
+        glfwMakeContextCurrent(glfw_window);
+    }
 }
 
 HOOK(eglSwapBuffers, EGLBoolean, (__attribute__((unused)) EGLDisplay display, __attribute__((unused)) EGLSurface surface)) {
-    glfwSwapBuffers(glfw_window);
+    if (!is_server) {
+        // Don't Swap Buffers In A Context-Less Window
+        glfwSwapBuffers(glfw_window);
+    }
 
     return EGL_TRUE;
 }
@@ -345,28 +362,42 @@ HOOK(SDL_Quit, void, ()) {
     glfwTerminate();
 }
 
+static SDL_GrabMode fake_grab_mode = SDL_GRAB_OFF;
+
 // Fix SDL Cursor Visibility/Grabbing
 HOOK(SDL_WM_GrabInput, SDL_GrabMode, (SDL_GrabMode mode)) {
-    if (mode != SDL_GRAB_QUERY && mode != SDL_WM_GrabInput(SDL_GRAB_QUERY)) {
-        glfwSetInputMode(glfw_window, GLFW_CURSOR, mode == SDL_GRAB_OFF ? GLFW_CURSOR_NORMAL : GLFW_CURSOR_DISABLED);
-        glfwSetInputMode(glfw_window, GLFW_RAW_MOUSE_MOTION, mode == SDL_GRAB_OFF ? GLFW_FALSE : GLFW_TRUE);
-
-        // GLFW Cursor Hiding is Broken
-        if (window_loaded) {
-            if (mode == SDL_GRAB_OFF) {
-                XFixesShowCursor(x11_display, x11_window);
-            } else {
-                XFixesHideCursor(x11_display, x11_window);
-            }
-            XFlush(x11_display);
+    if (is_server) {
+        // Don't Grab Input In Server/Headless Mode
+        if (mode != SDL_GRAB_QUERY) {
+            fake_grab_mode = mode;
         }
+        return fake_grab_mode;
+    } else {
+        if (mode != SDL_GRAB_QUERY && mode != SDL_WM_GrabInput(SDL_GRAB_QUERY)) {
+            glfwSetInputMode(glfw_window, GLFW_CURSOR, mode == SDL_GRAB_OFF ? GLFW_CURSOR_NORMAL : GLFW_CURSOR_DISABLED);
+            glfwSetInputMode(glfw_window, GLFW_RAW_MOUSE_MOTION, mode == SDL_GRAB_OFF ? GLFW_FALSE : GLFW_TRUE);
+
+            // GLFW Cursor Hiding is Broken
+            if (window_loaded) {
+                if (mode == SDL_GRAB_OFF) {
+                    XFixesShowCursor(x11_display, x11_window);
+                } else {
+                    XFixesHideCursor(x11_display, x11_window);
+                }
+                XFlush(x11_display);
+            }
+        }
+        return mode == SDL_GRAB_QUERY ? (glfwGetInputMode(glfw_window, GLFW_CURSOR) == GLFW_CURSOR_NORMAL ? SDL_GRAB_OFF : SDL_GRAB_ON) : mode;
     }
-    return mode == SDL_GRAB_QUERY ? (glfwGetInputMode(glfw_window, GLFW_CURSOR) == GLFW_CURSOR_NORMAL ? SDL_GRAB_OFF : SDL_GRAB_ON) : mode;
 }
 
 // Stub SDL Cursor Visibility
 HOOK(SDL_ShowCursor, int, (int toggle)) {
-    return toggle == SDL_QUERY ? (glfwGetInputMode(glfw_window, GLFW_CURSOR) == GLFW_CURSOR_NORMAL ? SDL_ENABLE : SDL_DISABLE) : toggle;
+    if (is_server) {
+        return toggle == SDL_QUERY ? (fake_grab_mode == SDL_GRAB_OFF ? SDL_ENABLE : SDL_DISABLE) : toggle;
+    } else {
+        return toggle == SDL_QUERY ? (glfwGetInputMode(glfw_window, GLFW_CURSOR) == GLFW_CURSOR_NORMAL ? SDL_ENABLE : SDL_DISABLE) : toggle;
+    }
 }
 
 // SDL Stub
@@ -430,6 +461,9 @@ HOOK(eglTerminate, EGLBoolean, (__attribute__((unused)) EGLDisplay display)) {
 
 // Use VirGL
 __attribute__((constructor)) static void init() {
+    is_server = get_is_server();
     setenv("LIBGL_ALWAYS_SOFTWARE", "1", 1); 
-    setenv("GALLIUM_DRIVER", "virpipe", 1);
+    if (!is_server) {
+        setenv("GALLIUM_DRIVER", "virpipe", 1);
+    }
 }

mods/src/cxx11_util.cpp

@@ -0,0 +1,18 @@
+// Use C++11 ABI
+#undef _GLIBCXX_USE_CXX11_ABI
+#define _GLIBCXX_USE_CXX11_ABI 1
+
+#include <string>
+
+#include "cxx11_util.h"
+
+// Convert A C-String into A C++11 String That Can be Acessed In C++03 Code
+cxx11_string create_cxx11_string(const char *str) {
+    std::string *new_str = new std::string(str);
+    int32_t new_size = sizeof (cxx11_string);
+    int32_t old_size = sizeof *new_str;
+    if (new_size != old_size) {
+        fprintf(stderr, "Mismatched String Size: Expected: %i Real: %i\n", new_size, old_size);
+    }
+    return *reinterpret_cast<cxx11_string *>(new_str);
+}

mods/src/cxx11_util.h

@@ -0,0 +1,21 @@
+#ifndef CXX_11_UTIL_H
+
+#define CXX_11_UTIL
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define CXX11_STRING_SIZE 24
+
+struct cxx11_string {
+    unsigned char data[CXX11_STRING_SIZE];
+};
+
+cxx11_string create_cxx11_string(const char *str);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

mods/src/extra.c

@@ -5,6 +5,7 @@
 #include <libcore/libcore.h>
 
 #include "extra.h"
+#include "server/server.h"
 
 static uint32_t getSpawnMobs_injection(__attribute__((unused)) int32_t obj) {
     return 1;
@@ -66,23 +67,6 @@ static void handleClick_injection(unsigned char *this, unsigned char *param_2, u
     }
 }
 
-int has_feature(const char *name) {
-    char *env = getenv("MCPI_FEATURES");
-    char *features = strdup(env != NULL ? env : "");
-    char *tok = strtok(features, "|");
-    int ret = 0;
-    while (tok != NULL) {
-        if (strcmp(tok, name) == 0) {
-            ret = 1;
-            break;
-        }
-        tok = strtok(NULL, "|");
-    }
-    free(features);
-    fprintf(stderr, "Feature: %s: %s\n", name, ret ? "Enabled" : "Disabled");
-    return ret;
-}
-
 // Patch Game Mode
 static void set_is_survival(int new_is_survival) {
     if (is_survival != new_is_survival) {
@@ -137,19 +121,62 @@ static void minecraft_init_injection(unsigned char *this) {
     *(this + 83) = 1;
 }
 
+// Is Dedicated Server
+static int is_server = 0;
+
+// Check For Feature
+int has_feature(const char *name) {
+    if (is_server) {
+        // Enable All Features In Server
+        return 1;
+    } else {
+        char *env = getenv("MCPI_FEATURES");
+        char *features = strdup(env != NULL ? env : "");
+        char *tok = strtok(features, "|");
+        int ret = 0;
+        while (tok != NULL) {
+            if (strcmp(tok, name) == 0) {
+                ret = 1;
+                break;
+            }
+            tok = strtok(NULL, "|");
+        }
+        free(features);
+        fprintf(stderr, "Feature: %s: %s\n", name, ret ? "Enabled" : "Disabled");
+        return ret;
+    }
+}
+
+int get_is_server() {
+    return getenv("MCPI_SERVER") != NULL;
+}
+
 __attribute__((constructor)) static void init() {
+    is_server = get_is_server();
+    if (is_server) {
+        server_init();
+    }
+
     if (has_feature("Touch GUI")) {
         // Use Touch UI
         unsigned char touch_gui_patch[4] = {0x01, 0x00, 0x50, 0xe3};
         patch((void *) 0x292fc, touch_gui_patch);
     }
 
+    // Get Default Game Mode
+    int default_game_mode;
+    if (is_server) {
+        default_game_mode = server_get_default_game_mode();
+    } else {
+        default_game_mode = !has_feature("Survival Mode");
+    }
+
     // Dyanmic Game Mode Switching
-    set_is_survival(0);
+    set_is_survival(!default_game_mode);
     setIsCreativeMode_original = overwrite((void *) setIsCreativeMode, setIsCreativeMode_injection);
 
     // Set Default Game Mode
-    unsigned char default_game_mode_patch[4] = {has_feature("Survival Mode") ? 0x00 : 0x01, 0x30, 0xa0, 0xe3};
+    unsigned char default_game_mode_patch[4] = {default_game_mode ? 0x01 : 0x00, 0x30, 0xa0, 0xe3};
     patch((void *) 0xba744, default_game_mode_patch);
 
     // Disable Item Dropping When Cursor Is Hidden
@@ -170,7 +197,13 @@ __attribute__((constructor)) static void init() {
         patch((void *) 0x15b0c, instamine_patch);
     }
 
-    if (has_feature("Mob Spawning")) {
+    int mob_spawning;
+    if (is_server) {
+        mob_spawning = server_get_mob_spawning();
+    } else {
+        mob_spawning = has_feature("Mob Spawning");
+    }
+    if (mob_spawning) {
         // Enable Mob Spawning
         overwrite((void *) 0xbabec, getSpawnMobs_injection);
     }
@@ -193,8 +226,14 @@ __attribute__((constructor)) static void init() {
     patch((void *) 0x6dc70, patch_data_9);
 
     // Change Username
-    const char *username = get_username();
-    fprintf(stderr, "Setting Username: %s\n", username);
+    const char *username;
+    if (is_server) {
+        // MOTD is Username
+        username = server_get_motd();
+    } else {
+        username = get_username();
+        fprintf(stderr, "Setting Username: %s\n", username);
+    }
     patch_address((void *) 0x18fd4, (void *) username);
 
     if (has_feature("Disable Autojump By Default")) {

mods/src/extra.cpp

@@ -8,14 +8,17 @@
 #include <libcore/libcore.h>
 
 #include "extra.h"
+#include "cxx11_util.h"
+
+#include <cstdio>
 
 extern "C" {
-    static std::string readAssetFile(__attribute__((unused)) unsigned char *obj, const std::string& path) {
+    static cxx11_string readAssetFile(__attribute__((unused)) unsigned char *obj, std::string const& path) {
         std::string full_path("./data/");
-        full_path.append(path.c_str());
+        full_path.append(path);
         std::ifstream stream(full_path);
         std::string str((std::istreambuf_iterator<char>(stream)), std::istreambuf_iterator<char>());
-        return str;
+        return create_cxx11_string(str.c_str());
     }
 
     typedef unsigned char *(*TextEditScreen_t)(unsigned char *, unsigned char *);

mods/src/extra.h

@@ -7,6 +7,7 @@ extern "C" {
 #endif
 
 int has_feature(const char *name);
+int get_is_server();
 
 void key_press(char key);
 void clear_input();

mods/src/server/server.cpp

@@ -0,0 +1,237 @@
+#include <string>
+#include <stdint.h>
+#include <ctime>
+#include <cstdio>
+#include <csignal>
+#include <fstream>
+
+#include <unistd.h>
+
+#include <SDL/SDL_events.h>
+
+#include <libcore/libcore.h>
+
+#include "server.h"
+#include "server_properties.h"
+
+typedef void (*Minecraft_update_t)(unsigned char *minecraft);
+static Minecraft_update_t Minecraft_update = (Minecraft_update_t) 0x16b74;
+static void *Minecraft_update_original = NULL;
+
+struct LevelSettings {
+    unsigned long seed;
+    int32_t game_type;
+};
+
+typedef void (*Minecraft_selectLevel_t)(unsigned char *minecraft, std::string const& level_dir, std::string const& level_name, LevelSettings const& vsettings);
+static Minecraft_selectLevel_t Minecraft_selectLevel = (Minecraft_selectLevel_t) 0x16f38;
+
+typedef void (*Minecraft_hostMultiplayer_t)(unsigned char *minecraft, int32_t port);
+static Minecraft_hostMultiplayer_t Minecraft_hostMultiplayer = (Minecraft_hostMultiplayer_t) 0x16664;
+
+typedef void *(*ProgressScreen_t)(unsigned char *obj);
+static ProgressScreen_t ProgressScreen = (ProgressScreen_t) 0x37044;
+
+typedef void (*Minecraft_setScreen_t)(unsigned char *minecraft, unsigned char *screen);
+static Minecraft_setScreen_t Minecraft_setScreen = (Minecraft_setScreen_t) 0x15d6c;
+
+#define INFO(msg, ...) printf("[INFO]: " msg "\n", __VA_ARGS__);
+
+// Store Minecraft For Exit
+static unsigned char *stored_minecraft = NULL;
+
+// Server Properties
+static ServerProperties &get_server_properties() {
+    static ServerProperties properties;
+    return properties;
+}
+
+// Default Server Properties
+#define DEFAULT_MOTD "Minecraft Server"
+#define DEFAULT_GAME_MODE "0"
+#define DEFAULT_PORT "19132"
+#define DEFAULT_SEED ""
+#define DEFAULT_MOB_SPAWNING "true"
+#define DEFAULT_WORLD_NAME "world"
+
+typedef const char *(*Minecraft_getProgressMessage_t)(unsigned char *minecraft);
+static Minecraft_getProgressMessage_t Minecraft_getProgressMessage = (Minecraft_getProgressMessage_t) 0x16e58;
+
+typedef int32_t (*Minecraft_isLevelGenerated_t)(unsigned char *minecraft);
+static Minecraft_isLevelGenerated_t Minecraft_isLevelGenerated = (Minecraft_isLevelGenerated_t) 0x16e6c;
+
+#define SIGNIFICANT_PROGRESS 5
+
+// Check If Two Percentages Are Different Enough To Be Logged
+static bool is_progress_difference_significant(int32_t new_val, int32_t old_val) {
+    if (new_val != old_val) {
+        if (new_val == -1 || old_val == -1) {
+            return true;
+        } else if (new_val == 0 || new_val == 100) {
+            return true;
+        } else {
+            return new_val - old_val >= SIGNIFICANT_PROGRESS;
+        }
+    } else {
+        return false;
+    }
+}
+
+// Runs Every Tick
+static int last_progress = -1;
+static const char *last_message = NULL;
+static bool loaded = false;
+static void Minecraft_update_injection(unsigned char *minecraft) {
+    // Create/Start World
+    if (!loaded) {
+        INFO("%s", "Starting Minecraft: Pi Edition Dedicated Server");
+
+        LevelSettings settings;
+        settings.game_type = 0; // Patched By MCPI-Docker
+        std::string seed_str = get_server_properties().get_string("seed", DEFAULT_SEED);
+        int32_t seed = seed_str.length() > 0 ? std::stoi(seed_str) : time(NULL);
+        settings.seed = seed;
+
+        std::string world_name = get_server_properties().get_string("world-name", DEFAULT_WORLD_NAME);
+        (*Minecraft_selectLevel)(minecraft, world_name, world_name, settings);
+
+        int port = get_server_properties().get_int("port", DEFAULT_PORT);
+        (*Minecraft_hostMultiplayer)(minecraft, port);
+        INFO("Listening On: %i", port);
+
+        void *screen = ::operator new(0x4c);
+        screen = (*ProgressScreen)((unsigned char *) screen);
+        (*Minecraft_setScreen)(minecraft, (unsigned char *) screen);
+
+        stored_minecraft = minecraft;
+
+        loaded = true;
+    }
+    
+    // Print Progress Message
+    const char *message = (*Minecraft_getProgressMessage)(minecraft);
+    int32_t progress = *(int32_t *) (minecraft + 0xc60);
+    if ((*Minecraft_isLevelGenerated)(minecraft)) {
+        message = "Ready";
+        progress = -1;
+    }
+    if (message != NULL) {
+        bool message_different = message != last_message;
+        bool progress_significant = is_progress_difference_significant(progress, last_progress);
+        if (message_different || progress_significant) {
+            if (progress != -1) {
+                INFO("Status: %s: %i%%", message, progress);
+            } else {
+                INFO("Status: %s", message);
+            }
+            if (message_different) {
+                last_message = message;
+            }
+            if (progress_significant) {
+                last_progress = progress;
+            }
+        }
+    }
+
+    // Call Original Method
+    revert_overwrite((void *) Minecraft_update, Minecraft_update_original);
+    (*Minecraft_update)(minecraft);
+    revert_overwrite((void *) Minecraft_update, Minecraft_update_original);
+}
+
+typedef void (*Level_saveLevelData_t)(unsigned char *level);
+static Level_saveLevelData_t Level_saveLevelData = (Level_saveLevelData_t) 0xa2e94;
+static void *Level_saveLevelData_original = NULL;
+
+static void Level_saveLevelData_injection(unsigned char *level) {
+    // Print Log Message
+    INFO("%s", "Saving Game");
+
+    // Call Original Method
+    revert_overwrite((void *) Level_saveLevelData, Level_saveLevelData_original);
+    (*Level_saveLevelData)(level);
+    revert_overwrite((void *) Level_saveLevelData, Level_saveLevelData_original);
+}
+
+typedef void (*Gui_addMessage_t)(unsigned char *gui, std::string const& text);
+static Gui_addMessage_t Gui_addMessage = (Gui_addMessage_t) 0x27820;
+static void *Gui_addMessage_original = NULL;
+
+static void Gui_addMessage_injection(unsigned char *gui, std::string const& text) {
+    // Print Log Message
+    printf("[CHAT]: %s\n", text.c_str());
+    
+    // Call Original Method
+    revert_overwrite((void *) Gui_addMessage, Gui_addMessage_original);
+    (*Gui_addMessage)(gui, text);
+    revert_overwrite((void *) Gui_addMessage, Gui_addMessage_original);
+}
+
+static void exit_handler(__attribute__((unused)) int data) {
+    INFO("%s", "Stopping Server");
+    if (stored_minecraft != NULL) {
+        unsigned char *level = *(unsigned char **) (stored_minecraft + 0x188);
+        if (level != NULL) {
+            // Save Game
+            (*Level_saveLevelData)(level);
+        }
+    }
+    // Stop Game
+    SDL_Event event;
+    event.type = SDL_QUIT;
+    SDL_PushEvent(&event);
+}
+
+const char *server_get_motd() {
+    return get_server_properties().get_string("motd", DEFAULT_MOTD).c_str();
+}
+int server_get_default_game_mode() {
+    return get_server_properties().get_int("game-mode", DEFAULT_GAME_MODE);
+}
+int server_get_mob_spawning() {
+    return get_server_properties().get_bool("spawn-mobs", DEFAULT_MOB_SPAWNING);
+}
+
+void server_init() {
+    // Open Properties File
+    std::string file(getenv("HOME"));
+    file.append("/.minecraft/server.properties");
+
+    std::ifstream properties_file(file);
+
+    if (!properties_file || !properties_file.is_open()) {
+        // Write Defaults
+        std::ofstream properties_file_output(file);
+        properties_file_output << "motd=" DEFAULT_MOTD "\n";
+        properties_file_output << "game-mode=" DEFAULT_GAME_MODE "\n";
+        properties_file_output << "port=" DEFAULT_PORT "\n";
+        properties_file_output << "seed=" DEFAULT_SEED "\n";
+        properties_file_output << "spawn-mobs=" DEFAULT_MOB_SPAWNING "\n";
+        properties_file_output << "world-name=" DEFAULT_WORLD_NAME "\n";
+        properties_file_output.close();
+        // Re-Open File
+        properties_file = std::ifstream(file);
+    }
+
+    if (!properties_file.is_open()) {
+        printf("[ERR]: Unable To Open server.properties\n");
+        exit(1);
+    }
+
+    // Load Properties
+    get_server_properties().load(properties_file);
+
+    properties_file.close();
+
+    // Prevent Main Player From Loading
+    unsigned char player_patch[4] = {0x00, 0x20, 0xa0, 0xe3};
+    patch((void *) 0x1685c, player_patch);
+    // Start World On Launch
+    Minecraft_update_original = overwrite((void *) Minecraft_update, (void *) Minecraft_update_injection);
+    // Print Log On Game Save
+    Level_saveLevelData_original = overwrite((void *) Level_saveLevelData, (void *) Level_saveLevelData_injection);
+    // Exit handler
+    signal(SIGINT, exit_handler);
+    // Print Chat To Log
+    Gui_addMessage_original = overwrite((void *) Gui_addMessage, (void *) Gui_addMessage_injection);
+}

mods/src/server/server.h

@@ -0,0 +1,19 @@
+#ifndef SERVER_H
+
+#define SERVER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void server_init();
+
+const char *server_get_motd();
+int server_get_default_game_mode();
+int server_get_mob_spawning();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

mods/src/server/server_properties.cpp

@@ -0,0 +1,37 @@
+#include "server_properties.h"
+
+static bool is_true(std::string const& val) {
+    return (val == "true" || val == "yes" || val == "1");
+}
+
+void ServerProperties::load(std::istream& stream) {
+    std::string line;
+    while (std::getline(stream, line)) {
+        if (line.length() > 0) {
+            if (line[0] == '#') {
+                continue;
+            }
+            size_t i = line.find('=');
+            if (i == std::string::npos) {
+                continue;
+            }
+            properties.insert(std::pair<std::string, std::string>(line.substr(0, i), line.substr(i + 1)));
+        }
+    }
+}
+
+std::string ServerProperties::get_string(std::string const& name, std::string const& def) {
+    return properties.count(name) > 0 ? properties.at(name) : def;
+}
+
+int ServerProperties::get_int(std::string const& name, std::string const& def) {
+    return properties.count(name) > 0 ? std::stoi(properties.at(name)) : std::stoi(def);
+}
+
+bool ServerProperties::get_bool(std::string const& name, std::string const& def) {
+    if (properties.count(name) > 0) {
+        std::string const& val = properties.at(name);
+        return is_true(val);
+    }
+    return is_true(def);
+}

mods/src/server/server_properties.h

@@ -0,0 +1,22 @@
+#ifndef SERVER_PROPERTIES_H
+
+#define SERVER_PROPERTIES_H
+
+#include <string>
+#include <istream>
+#include <map>
+
+class ServerProperties {
+
+private:
+    std::map<std::string, std::string> properties;
+
+public:
+    void load(std::istream& fstream);
+
+    std::string get_string(std::string const& name, std::string const& def);
+    int get_int(std::string const& name, std::string const& def);
+    bool get_bool(std::string const& name, std::string const& def);
+};
+
+#endif

scripts/build.sh

@@ -2,4 +2,5 @@
 
 set -e
 
-docker build ${DOCKER_BUILD_OPTIONS} --tag thebrokenrail/minecraft-pi:latest .
+docker build ${DOCKER_BUILD_OPTIONS} --tag thebrokenrail/minecraft-pi:client -f Dockerfile.client .
+docker build ${DOCKER_BUILD_OPTIONS} --tag thebrokenrail/minecraft-pi:server -f Dockerfile.server .

scripts/package.sh

@@ -10,7 +10,8 @@ rm -rf out
 mkdir -p out/deb
 
 # Generate DEB
-dpkg -b debian out/deb
+dpkg -b debian/client out/deb
+dpkg -b debian/server out/deb
 
 # Export Libraries
 mkdir -p out/lib
@@ -19,6 +20,6 @@ mkdir -p out/lib
 cp -r mods/include out/lib/include
 
 # Copy Shared Library
-IMG_ID="$(docker create thebrokenrail/minecraft-pi)"
+IMG_ID="$(docker create thebrokenrail/minecraft-pi:client)"
 docker cp "${IMG_ID}":/app/minecraft-pi/mods/. ./out/lib/.
 docker rm -v "${IMG_ID}"