259 lines
10 KiB
C
259 lines
10 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <GLES/gl.h>
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#include <libreborn/libreborn.h>
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#include <symbols/minecraft.h>
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#include <SDL/SDL.h>
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#include <media-layer/core.h>
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#include "../init/init.h"
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#include "../feature/feature.h"
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#include "misc.h"
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// Maximum Username Length
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#define MAX_USERNAME_LENGTH 16
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// Additional GUI Rendering
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static int hide_chat_messages = 0;
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static int render_selected_item_text = 0;
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static void Gui_renderChatMessages_injection(unsigned char *gui, int32_t y_offset, uint32_t max_messages, bool disable_fading, unsigned char *font) {
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// Call Original Method
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if (!hide_chat_messages) {
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(*Gui_renderChatMessages)(gui, y_offset, max_messages, disable_fading, font);
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}
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// Render Selected Item Text
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if (render_selected_item_text) {
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// Fix GL Mode
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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// Calculate Selected Item Text Scale
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unsigned char *minecraft = *(unsigned char **) (gui + Gui_minecraft_property_offset);
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int32_t screen_width = *(int32_t *) (minecraft + Minecraft_screen_width_property_offset);
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float scale = ((float) screen_width) * *InvGuiScale;
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// Render Selected Item Text
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(*Gui_renderOnSelectItemNameText)(gui, (int32_t) scale, font, y_offset - 0x13);
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}
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}
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// Reset Selected Item Text Timer On Slot Select
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static uint32_t reset_selected_item_text_timer = 0;
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static void Gui_tick_injection(unsigned char *gui) {
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// Call Original Method
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(*Gui_tick)(gui);
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// Handle Reset
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if (render_selected_item_text) {
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float *selected_item_text_timer = (float *) (gui + Gui_selected_item_text_timer_property_offset);
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if (reset_selected_item_text_timer) {
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// Reset
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*selected_item_text_timer = 0;
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reset_selected_item_text_timer = 0;
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}
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}
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}
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// Trigger Reset Selected Item Text Timer On Slot Select
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static void Inventory_selectSlot_injection(unsigned char *inventory, int32_t slot) {
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// Call Original Method
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(*Inventory_selectSlot)(inventory, slot);
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// Trigger Reset Selected Item Text Timer
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if (render_selected_item_text) {
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reset_selected_item_text_timer = 1;
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}
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}
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// Sanitize Username
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static void LoginPacket_read_injection(unsigned char *packet, unsigned char *bit_stream) {
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// Call Original Method
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(*LoginPacket_read)(packet, bit_stream);
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// Prepare
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unsigned char *rak_string = packet + LoginPacket_username_property_offset;
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// Get Original Username
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unsigned char *shared_string = *(unsigned char **) (rak_string + RakNet_RakString_sharedString_property_offset);
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char *c_str = *(char **) (shared_string + RakNet_RakString_SharedString_c_str_property_offset);
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// Sanitize
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char *new_username = strdup(c_str);
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ALLOC_CHECK(new_username);
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sanitize_string(&new_username, MAX_USERNAME_LENGTH, 0);
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// Set New Username
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(*RakNet_RakString_Assign)(rak_string, new_username);
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// Free
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free(new_username);
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}
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// Fix RakNet::RakString Security Bug
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//
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// RakNet::RakString's format constructor is often given unsanitized user input and is never used for formatting,
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// this is a massive security risk, allowing clients to run arbitrary format specifiers, this disables the
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// formatting functionality.
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static unsigned char *RakNet_RakString_injection(unsigned char *rak_string, const char *format, ...) {
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// Call Original Method
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return (*RakNet_RakString)(rak_string, "%s", format);
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}
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// Print Error Message If RakNet Startup Fails
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static char *RAKNET_ERROR_NAMES[] = {
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"Success",
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"Already Started",
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"Invalid Socket Descriptors",
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"Invalid Max Connections",
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"Socket Family Not Supported",
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"Part Already In Use",
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"Failed To Bind Port",
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"Failed Test Send",
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"Port Cannot Be 0",
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"Failed To Create Network Thread",
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"Couldn't Generate GUID",
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"Unknown"
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};
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#ifdef MCPI_SERVER_MODE
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#define PRINT_RAKNET_STARTUP_FAILURE ERR
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#else
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#define PRINT_RAKNET_STARTUP_FAILURE WARN
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#endif
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static RakNet_StartupResult RakNetInstance_host_RakNet_RakPeer_Startup_injection(unsigned char *rak_peer, unsigned short maxConnections, unsigned char *socketDescriptors, uint32_t socketDescriptorCount, int32_t threadPriority) {
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// Call Original Method
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RakNet_StartupResult result = (*RakNet_RakPeer_Startup)(rak_peer, maxConnections, socketDescriptors, socketDescriptorCount, threadPriority);
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// Print Error
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if (result != RAKNET_STARTED) {
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PRINT_RAKNET_STARTUP_FAILURE("Failed To Start RakNet: %s", RAKNET_ERROR_NAMES[result]);
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}
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// Return
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return result;
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}
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// Fix Bug Where RakNetInstance Starts Pinging Potential Servers Before The "Join Game" Screen Is Opened
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static unsigned char *RakNetInstance_injection(unsigned char *rak_net_instance) {
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// Call Original Method
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unsigned char *result = (*RakNetInstance)(rak_net_instance);
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// Fix
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*(unsigned char *) (rak_net_instance + RakNetInstance_pinging_for_hosts_property_offset) = 0;
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// Return
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return result;
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}
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// Close Current Screen On Death To Prevent Bugs
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static void LocalPlayer_die_injection(unsigned char *entity, unsigned char *cause) {
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// Close Screen
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unsigned char *minecraft = *(unsigned char **) (entity + LocalPlayer_minecraft_property_offset);
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(*Minecraft_setScreen)(minecraft, NULL);
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// Call Original Method
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(*LocalPlayer_die)(entity, cause);
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}
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// Fix Furnace Not Checking Item Auxiliary When Inserting New Item
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static int32_t FurnaceScreen_handleAddItem_injection(unsigned char *furnace_screen, int32_t slot, ItemInstance const *item) {
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// Get Existing Item
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unsigned char *tile_entity = *(unsigned char **) (furnace_screen + FurnaceScreen_tile_entity_property_offset);
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unsigned char *tile_entity_vtable = *(unsigned char **) tile_entity;
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FurnaceTileEntity_getItem_t FurnaceTileEntity_getItem = *(FurnaceTileEntity_getItem_t *) (tile_entity_vtable + FurnaceTileEntity_getItem_vtable_offset);
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ItemInstance *existing_item = (*FurnaceTileEntity_getItem)(tile_entity, slot);
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// Check Item
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int valid;
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if (item->id == existing_item->id && item->auxiliary == existing_item->auxiliary) {
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// Item Matches, Is Valid
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valid = 1;
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} else {
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// Item Doesn't Match, Check If Existing Item Is Empty
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if ((existing_item->id | existing_item->count | existing_item->auxiliary) == 0) {
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// Existing Item Is Empty, Is Valid
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valid = 1;
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} else {
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// Existing Item Isn't Empty, Isn't Valid
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valid = 0;
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}
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}
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// Call Original Method
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if (valid) {
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// Valid
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return (*FurnaceScreen_handleAddItem)(furnace_screen, slot, item);
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} else {
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// Invalid
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return 0;
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}
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}
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// Custom Cursor Rendering
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//
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// The default behavior for Touch GUI is to only render the cursor when the mouse is clicking, this fixes that.
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// This also makes the cursor always render if the mouse is unlocked, instead of just when there is a Screen showing.
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static void GameRenderer_render_injection(unsigned char *game_renderer, float param_1) {
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// Call Original Method
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(*GameRenderer_render)(game_renderer, param_1);
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// Check If Cursor Should Render
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if (SDL_WM_GrabInput(SDL_GRAB_QUERY) == SDL_GRAB_OFF) {
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// Get X And Y
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float x = (*Mouse_getX)() * (*InvGuiScale);
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float y = (*Mouse_getY)() * (*InvGuiScale);
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// Render Cursor
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unsigned char *minecraft = *(unsigned char **) (game_renderer + GameRenderer_minecraft_property_offset);
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(*renderCursor)(x, y, minecraft);
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}
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}
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// Init
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void init_misc() {
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// Remove Invalid Item Background (A Red Background That Appears For Items That Are Not Included In The gui_blocks Atlas)
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if (feature_has("Remove Invalid Item Background", server_disabled)) {
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unsigned char invalid_item_background_patch[4] = {0x00, 0xf0, 0x20, 0xe3}; // "nop"
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patch((void *) 0x63c98, invalid_item_background_patch);
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}
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// Render Selected Item Text + Hide Chat Messages
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hide_chat_messages = feature_has("Hide Chat Messages", server_disabled);
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render_selected_item_text = feature_has("Render Selected Item Text", server_disabled);
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overwrite_calls((void *) Gui_renderChatMessages, (void *) Gui_renderChatMessages_injection);
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overwrite_calls((void *) Gui_tick, (void *) Gui_tick_injection);
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overwrite_calls((void *) Inventory_selectSlot, (void *) Inventory_selectSlot_injection);
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// Sanitize Username
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patch_address(LoginPacket_read_vtable_addr, (void *) LoginPacket_read_injection);
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// Fix RakNet::RakString Security Bug
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overwrite_calls((void *) RakNet_RakString, (void *) RakNet_RakString_injection);
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// Print Error Message If RakNet Startup Fails
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overwrite_call((void *) 0x73778, (void *) RakNetInstance_host_RakNet_RakPeer_Startup_injection);
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// Fix Bug Where RakNetInstance Starts Pinging Potential Servers Before The "Join Game" Screen Is Opened
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overwrite_calls((void *) RakNetInstance, (void *) RakNetInstance_injection);
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// Close Current Screen On Death To Prevent Bugs
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if (feature_has("Close Current Screen On Death", server_disabled)) {
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patch_address(LocalPlayer_die_vtable_addr, (void *) LocalPlayer_die_injection);
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}
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// Fix Furnace Not Checking Item Auxiliary When Inserting New Item
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if (feature_has("Fix Furnace Not Checking Item Auxiliary", server_disabled)) {
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overwrite_calls((void *) FurnaceScreen_handleAddItem, (void *) FurnaceScreen_handleAddItem_injection);
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}
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// Improved Cursor Rendering
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if (feature_has("Improved Cursor Rendering", server_disabled)) {
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// Disable Normal Cursor Rendering
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unsigned char disable_cursor_patch[4] = {0x00, 0xf0, 0x20, 0xe3}; // "nop"
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patch((void *) 0x4a6c0, disable_cursor_patch);
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// Add Custom Cursor Rendering
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overwrite_calls((void *) GameRenderer_render, (void *) GameRenderer_render_injection);
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}
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// Disable V-Sync
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if (feature_has("Disable V-Sync", server_disabled)) {
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media_disable_vsync();
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}
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// Init C++ And Logging
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_init_misc_cpp();
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_init_misc_logging();
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}
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