Files
barecopper/src/packets.c
2025-08-12 18:22:37 +03:00

598 lines
19 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>
#include "globals.h"
#include "tools.h"
#include "varnum.h"
#include "registries.h"
#include "worldgen.h"
#include "crafting.h"
// C->S Handshake
int cs_handshake (int client_fd) {
printf("Received Handshake:\n");
printf(" Protocol version: %d\n", readVarInt(client_fd));
readString(client_fd);
if (recv_count == -1) return 1;
printf(" Server address: %s\n", recv_buffer);
printf(" Server port: %u\n", readUint16(client_fd));
int intent = readVarInt(client_fd);
if (intent == VARNUM_ERROR) return 1;
printf(" Intent: %d\n\n", intent);
setClientState(client_fd, intent);
return 0;
}
// C->S Login Start
// Leaves player name and UUID at indexes 0 and 17 of recv_buffer, respectively
int cs_loginStart (int client_fd) {
printf("Received Login Start:\n");
readString(client_fd);
if (recv_count == -1) return 1;
printf(" Player name: %s\n", recv_buffer);
recv_count = recv(client_fd, recv_buffer + 17, 16, MSG_WAITALL);
if (recv_count == -1) return 1;
printf(" Player UUID: ");
for (int i = 17; i < 33; i ++) printf("%x", recv_buffer[i]);
printf("\n\n");
return 0;
}
// S->C Login Success
int sc_loginSuccess (int client_fd, char *name, char *uuid) {
printf("Sending Login Success...\n\n");
int name_length = strlen(name);
writeVarInt(client_fd, 1 + 16 + sizeVarInt(name_length) + name_length + 1);
writeVarInt(client_fd, 0x02);
send(client_fd, uuid, 16, 0);
writeVarInt(client_fd, name_length);
send(client_fd, name, name_length, 0);
writeVarInt(client_fd, 0);
return 0;
}
int cs_clientInformation (int client_fd) {
int tmp;
printf("Received Client Information:\n");
readString(client_fd);
if (recv_count == -1) return 1;
printf(" Locale: %s\n", recv_buffer);
tmp = readByte(client_fd);
if (recv_count == -1) return 1;
printf(" View distance: %d\n", tmp);
tmp = readVarInt(client_fd);
if (recv_count == -1) return 1;
printf(" Chat mode: %d\n", tmp);
tmp = readByte(client_fd);
if (recv_count == -1) return 1;
if (tmp) printf(" Chat colors: on\n", tmp);
else printf(" Chat colors: off\n", tmp);
tmp = readByte(client_fd);
if (recv_count == -1) return 1;
printf(" Skin parts: %d\n", tmp);
tmp = readVarInt(client_fd);
if (recv_count == -1) return 1;
if (tmp) printf(" Main hand: right\n", tmp);
else printf(" Main hand: left\n", tmp);
tmp = readByte(client_fd);
if (recv_count == -1) return 1;
if (tmp) printf(" Text filtering: on\n", tmp);
else printf(" Text filtering: off\n", tmp);
tmp = readByte(client_fd);
if (recv_count == -1) return 1;
if (tmp) printf(" Allow listing: on\n", tmp);
else printf(" Allow listing: off\n", tmp);
tmp = readVarInt(client_fd);
if (recv_count == -1) return 1;
printf(" Particles: %d\n\n", tmp);
return 0;
}
// S->C Clientbound Known Packs
int sc_knownPacks (int client_fd) {
printf("Sending Server's Known Packs\n\n");
char known_packs[] = {
0x0e, 0x01, 0x09, 0x6d, 0x69, 0x6e,
0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x04, 0x63,
0x6f, 0x72, 0x65, 0x06, 0x31, 0x2e, 0x32, 0x31,
0x2e, 0x38
};
writeVarInt(client_fd, 24);
send(client_fd, &known_packs, 24, 0);
return 0;
}
// C->S Serverbound Plugin Message
int cs_pluginMessage (int client_fd) {
printf("Received Plugin Message:\n");
readString(client_fd);
if (recv_count == -1) return 1;
printf(" Channel: \"%s\"\n", recv_buffer);
if (strcmp(recv_buffer, "minecraft:brand") == 0) {
readString(client_fd);
if (recv_count == -1) return 1;
printf(" Brand: \"%s\"\n", recv_buffer);
}
printf("\n");
return 0;
}
// S->C Finish Configuration
int sc_finishConfiguration (int client_fd) {
writeVarInt(client_fd, 1);
writeVarInt(client_fd, 0x03);
return 0;
}
// S->C Login (play)
int sc_loginPlay (int client_fd) {
writeVarInt(client_fd, 69 + sizeVarInt(MAX_PLAYERS));
writeByte(client_fd, 0x2B);
// entity id
uint32_t entity_id = getClientIndex(client_fd);
send(client_fd, &entity_id, 4, 0);
// hardcore
writeByte(client_fd, false);
// dimensions
writeVarInt(client_fd, 1);
writeVarInt(client_fd, 19);
const char *dimension = "minecraft:overworld";
send(client_fd, dimension, 19, 0);
// maxplayers
writeVarInt(client_fd, MAX_PLAYERS);
// view distance
writeVarInt(client_fd, 2);
// sim distance
writeVarInt(client_fd, 2);
// reduced debug info
writeByte(client_fd, 0);
// respawn screen
writeByte(client_fd, true);
// limited crafting
writeByte(client_fd, false);
// dimension id
writeVarInt(client_fd, 0);
// dimension name
writeVarInt(client_fd, 19);
send(client_fd, dimension, 19, 0);
// hashed seed
writeUint64(client_fd, 0x0123456789ABCDEF);
// gamemode
writeByte(client_fd, GAMEMODE);
// previous gamemode
writeByte(client_fd, 0xFF);
// is debug
writeByte(client_fd, 0);
// is flat
writeByte(client_fd, 0);
// has death location
writeByte(client_fd, 0);
// portal cooldown
writeVarInt(client_fd, 0);
// sea level
writeVarInt(client_fd, 63);
// secure chat
writeByte(client_fd, 0);
return 0;
}
// S->C Synchronize Player Position
int sc_synchronizePlayerPosition (int client_fd, double x, double y, double z, float yaw, float pitch) {
writeVarInt(client_fd, 61 + sizeVarInt(-1));
writeByte(client_fd, 0x41);
// Teleport ID
writeVarInt(client_fd, -1);
// Position
writeDouble(client_fd, x);
writeDouble(client_fd, y);
writeDouble(client_fd, z);
// Velocity
writeDouble(client_fd, 0);
writeDouble(client_fd, 0);
writeDouble(client_fd, 0);
// Angles (Yaw/Pitch)
writeFloat(client_fd, yaw);
writeFloat(client_fd, pitch);
// Flags
writeUint32(client_fd, 0);
return 0;
}
// S->C Set Default Spawn Position
int sc_setDefaultSpawnPosition (int client_fd, long x, long y, long z) {
writeVarInt(client_fd, sizeVarInt(0x5A) + 12);
writeVarInt(client_fd, 0x5A);
writeUint64(client_fd, ((x & 0x3FFFFFF) << 38) | ((z & 0x3FFFFFF) << 12) | (y & 0xFFF));
writeFloat(client_fd, 0);
}
// S->C Game Event 13 (Start waiting for level chunks)
int sc_startWaitingForChunks (int client_fd) {
writeVarInt(client_fd, 6);
writeByte(client_fd, 0x22);
writeByte(client_fd, 13);
writeUint32(client_fd, 0);
return 0;
}
// S->C Set Center Chunk
int sc_setCenterChunk (int client_fd, int x, int y) {
writeVarInt(client_fd, 1 + sizeVarInt(x) + sizeVarInt(y));
writeByte(client_fd, 0x57);
writeVarInt(client_fd, x);
writeVarInt(client_fd, y);
return 0;
}
// S->C Chunk Data and Update Light
int sc_chunkDataAndUpdateLight (int client_fd, int _x, int _z) {
int palette_size = 0;
for (int i = 0; i < 256; i ++) palette_size += sizeVarInt(block_palette[i]);
const int chunk_data_size = (4101 + sizeVarInt(256) + palette_size) * 24;
writeVarInt(client_fd, 17 + sizeVarInt(chunk_data_size) + chunk_data_size);
writeByte(client_fd, 0x27);
writeUint32(client_fd, _x);
writeUint32(client_fd, _z);
writeVarInt(client_fd, 0); // omit heightmaps
writeVarInt(client_fd, chunk_data_size);
int x = _x * 16, z = _z * 16, y;
// send chunk sections
for (int i = 0; i < 24; i ++) {
y = i * 16 - 64;
writeUint16(client_fd, 4096); // block count
writeByte(client_fd, 8); // bits per entry
writeVarInt(client_fd, 256);
for (int j = 0; j < 256; j ++) writeVarInt(client_fd, block_palette[j]);
for (int j = 0; j < 4096; j += 8) {
for (int k = j + 7; k >= j; k --) {
writeByte(client_fd, getBlockAt(
k % 16 + x,
k / 256 + y,
k / 16 % 16 + z
));
}
}
// biome data
writeByte(client_fd, 0); // bits per entry
writeByte(client_fd, 21); // palette (forest)
}
writeVarInt(client_fd, 0); // omit block entities
// light data
writeVarInt(client_fd, 0);
writeVarInt(client_fd, 0);
writeVarInt(client_fd, 0);
writeVarInt(client_fd, 0);
writeVarInt(client_fd, 0);
writeVarInt(client_fd, 0);
return 0;
}
// S->C Clientbound Keep Alive (play)
int sc_keepAlive (int client_fd) {
writeVarInt(client_fd, 9);
writeByte(client_fd, 0x26);
writeUint64(client_fd, 0);
}
// S->C Set Container Slot
int sc_setContainerSlot (int client_fd, int window_id, uint16_t slot, uint8_t count, uint16_t item) {
writeVarInt(client_fd,
1 +
sizeVarInt(window_id) +
1 + 2 +
sizeVarInt(count) +
(count > 0 ? sizeVarInt(item) + 2 : 0)
);
writeByte(client_fd, 0x14);
writeVarInt(client_fd, window_id);
writeVarInt(client_fd, 0);
writeUint16(client_fd, slot);
writeVarInt(client_fd, count);
if (count > 0) {
writeVarInt(client_fd, item);
writeVarInt(client_fd, 0);
writeVarInt(client_fd, 0);
}
return 0;
}
// C->S Player Action
int cs_playerAction (int client_fd) {
uint8_t action = readByte(client_fd);
int64_t pos = readInt64(client_fd);
int x = pos >> 38;
int y = pos << 52 >> 52;
int z = pos << 26 >> 38;
readByte(client_fd); // ignore face
int sequence = readVarInt(client_fd);
if ((action == 0 && GAMEMODE == 1)) {
// block was mined in creative
makeBlockChange(x, y, z, 0);
} else if (action == 2) {
// block was mined in survival
uint8_t block = getBlockAt(x, y, z);
uint16_t item, tmp;
if (block == B_oak_leaves) {
if (sequence % 200 < 2) item = I_apple;
else if (sequence % 50 < 2) item = I_stick;
else if (sequence % 40 < 2) item = I_oak_sapling;
else item = 0;
} else item = B_to_I[block];
makeBlockChange(x, y, z, 0);
if (item) givePlayerItem(client_fd, item);
}
return 0;
}
// S->C Open Screen
int sc_openScreen (int client_fd, uint8_t window, const char *title, uint16_t length) {
writeVarInt(client_fd, 1 + 2 * sizeVarInt(window) + 1 + 2 + length);
writeByte(client_fd, 0x34);
writeVarInt(client_fd, window);
writeVarInt(client_fd, window);
writeByte(client_fd, 8); // string nbt tag
writeUint16(client_fd, length); // string length
send(client_fd, title, length, 0);
}
// C->S Use Item On
int cs_useItemOn (int client_fd) {
uint8_t hand = readByte(client_fd);
int64_t pos = readInt64(client_fd);
int x = pos >> 38;
int y = pos << 52 >> 52;
int z = pos << 26 >> 38;
uint8_t face = readByte(client_fd);
// ignore cursor position
readUint32(client_fd);
readUint32(client_fd);
readUint32(client_fd);
// ignore "inside block" and "world border hit"
readByte(client_fd);
readByte(client_fd);
int sequence = readVarInt(client_fd);
uint8_t target = getBlockAt(x, y, z);
if (target == B_crafting_table) {
sc_openScreen(client_fd, 12, "Crafting", 8);
return 0;
}
PlayerData *player;
if (getPlayerData(client_fd, &player)) return 1;
uint16_t item = player->inventory_items[player->hotbar];
uint8_t block = item == 320 ? B_crafting_table : I_to_B[item]; // hack!!
// if the selected item doesn't correspond to a block, exit
if (block == 0) return 0;
// if the selected slot doesn't hold any items, exit
if (player->inventory_count[player->hotbar] == 0) return 0;
// decrease item amount in selected slot
player->inventory_count[player->hotbar] --;
// clear item id in slot if amount is zero
if (player->inventory_count[player->hotbar] == 0)
player->inventory_items[player->hotbar] = 0;
switch (face) {
case 0: makeBlockChange(x, y - 1, z, block); break;
case 1: makeBlockChange(x, y + 1, z, block); break;
case 2: makeBlockChange(x, y, z - 1, block); break;
case 3: makeBlockChange(x, y, z + 1, block); break;
case 4: makeBlockChange(x - 1, y, z, block); break;
case 5: makeBlockChange(x + 1, y, z, block); break;
default: break;
}
return 0;
}
// C->S Click Container
int cs_clickContainer (int client_fd) {
int window_id = readVarInt(client_fd);
readVarInt(client_fd); // ignore state id
readUint16(client_fd); // ignore clicked slot number
readByte(client_fd); // ignore button
readVarInt(client_fd); // ignore operation mode
int changes_count = readVarInt(client_fd);
PlayerData *player;
if (getPlayerData(client_fd, &player)) return 1;
uint8_t slot, count, craft = false;
uint16_t item;
int tmp;
for (int i = 0; i < changes_count; i ++) {
slot = clientSlotToServerSlot(window_id, readUint16(client_fd));
// slots outside of the inventory overflow into the crafting buffer
if (slot > 40) craft = true;
if (!readByte(client_fd)) { // no item?
if (slot != 255) {
player->inventory_items[slot] = 0;
if (slot <= 40) player->inventory_count[slot] = 0;
}
continue;
}
item = readVarInt(client_fd);
count = (uint8_t)readVarInt(client_fd);
// ignore components
tmp = readVarInt(client_fd);
recv(client_fd, recv_buffer, tmp, MSG_WAITALL);
tmp = readVarInt(client_fd);
recv(client_fd, recv_buffer, tmp, MSG_WAITALL);
if (count > 0) {
player->inventory_items[slot] = item;
if (slot <= 40) player->inventory_count[slot] = count;
}
}
if (craft) {
getCraftingOutput(player, &count, &item);
sc_setContainerSlot(client_fd, window_id, 0, count, item);
}
return 0;
}
// C->S Set Player Position And Rotation
int cs_setPlayerPositionAndRotation (int client_fd, double *x, double *y, double *z, float *yaw, float *pitch) {
*x = readDouble(client_fd);
*y = readDouble(client_fd);
*z = readDouble(client_fd);
*yaw = readFloat(client_fd);
*pitch = readFloat(client_fd);
// ignore flags
readByte(client_fd);
return 0;
}
// C->S Set Player Position
int cs_setPlayerPosition (int client_fd, double *x, double *y, double *z) {
*x = readDouble(client_fd);
*y = readDouble(client_fd);
*z = readDouble(client_fd);
// ignore flags
readByte(client_fd);
return 0;
}
// C->S Set Held Item (serverbound)
int cs_setHeldItem (int client_fd) {
PlayerData *player;
if (getPlayerData(client_fd, &player)) return 1;
player->hotbar = (uint8_t)readUint16(client_fd);
return 0;
}
// S->C Set Held Item (clientbound)
int sc_setHeldItem (int client_fd, uint8_t slot) {
writeVarInt(client_fd, sizeVarInt(0x62) + 1);
writeVarInt(client_fd, 0x62);
writeByte(client_fd, slot);
return 0;
}
// S->C Registry Data (Multiple packets)
int sc_registries (int client_fd) {
printf("Sending Registries\n\n");
send(client_fd, registries_bin, sizeof(registries_bin), 0);
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char cat_variant[] = { 0x07, 0x15, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x63, 0x61, 0x74, 0x5f, 0x76, 0x61, 0x72, 0x69, 0x61, 0x6e, 0x74, 0x0b, 0x13, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x61, 0x6c, 0x6c, 0x5f, 0x62, 0x6c, 0x61, 0x63, 0x6b, 0x00, 0x0f, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x62, 0x6c, 0x61, 0x63, 0x6b, 0x00, 0x1b, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x62, 0x72, 0x69, 0x74, 0x69, 0x73, 0x68, 0x5f, 0x73, 0x68, 0x6f, 0x72, 0x74, 0x68, 0x61, 0x69, 0x72, 0x00, 0x10, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x63, 0x61, 0x6c, 0x69, 0x63, 0x6f, 0x00, 0x10, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x6a, 0x65, 0x6c, 0x6c, 0x69, 0x65, 0x00, 0x11, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x70, 0x65, 0x72, 0x73, 0x69, 0x61, 0x6e, 0x00, 0x11, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x72, 0x61, 0x67, 0x64, 0x6f, 0x6c, 0x6c, 0x00, 0x0d, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x72, 0x65, 0x64, 0x00, 0x11, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x73, 0x69, 0x61, 0x6d, 0x65, 0x73, 0x65, 0x00, 0x0f, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x74, 0x61, 0x62, 0x62, 0x79, 0x00, 0x0f, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x77, 0x68, 0x69, 0x74, 0x65, 0x00 };
char cow_variant[] = { 0x07, 0x15, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x63, 0x6f, 0x77, 0x5f, 0x76, 0x61, 0x72, 0x69, 0x61, 0x6e, 0x74, 0x03, 0x0e, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x63, 0x6f, 0x6c, 0x64, 0x00, 0x13, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x74, 0x65, 0x6d, 0x70, 0x65, 0x72, 0x61, 0x74, 0x65, 0x00, 0x0e, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x77, 0x61, 0x72, 0x6d, 0x00 };
char chicken_variant[] = { 0x07, 0x19, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x63, 0x68, 0x69, 0x63, 0x6b, 0x65, 0x6e, 0x5f, 0x76, 0x61, 0x72, 0x69, 0x61, 0x6e, 0x74, 0x03, 0x0e, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x63, 0x6f, 0x6c, 0x64, 0x00, 0x13, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x74, 0x65, 0x6d, 0x70, 0x65, 0x72, 0x61, 0x74, 0x65, 0x00, 0x0e, 0x6d, 0x69, 0x6e, 0x65, 0x63, 0x72, 0x61, 0x66, 0x74, 0x3a, 0x77, 0x61, 0x72, 0x6d, 0x00 };
writeVarInt(client_fd, sizeof(wolf_sound_variant));
send(client_fd, &wolf_sound_variant, sizeof(wolf_sound_variant), 0);
writeVarInt(client_fd, sizeof(pig_variant));
send(client_fd, &pig_variant, sizeof(pig_variant), 0);
writeVarInt(client_fd, sizeof(frog_variant));
send(client_fd, &frog_variant, sizeof(frog_variant), 0);
writeVarInt(client_fd, sizeof(cat_variant));
send(client_fd, &cat_variant, sizeof(cat_variant), 0);
writeVarInt(client_fd, sizeof(cow_variant));
send(client_fd, &cow_variant, sizeof(cow_variant), 0);
writeVarInt(client_fd, sizeof(chicken_variant));
send(client_fd, &chicken_variant, sizeof(chicken_variant), 0);
return 0;
}