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polyjuice.h
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polyjuice.h
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#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ckb_syscalls.h"
#include <ethash/keccak.hpp>
#include <evmc/evmc.h>
#include <evmc/evmc.hpp>
#include <evmone/evmone.h>
#include "uint256.h"
/* https://stackoverflow.com/a/1545079 */
#pragma push_macro("errno")
#undef errno
#include "godwoken.h"
#include "gw_eth_addr_reg.h"
#include "gw_syscalls.h"
#include "sudt_utils.h"
#pragma pop_macro("errno")
#include "common.h"
#include "polyjuice_errors.h"
#include "polyjuice_utils.h"
#ifdef GW_GENERATOR
#include "generator/secp256k1_helper.h"
#else
#include "validator/secp256k1_helper.h"
#endif
#include "contracts.h"
#define is_create(kind) ((kind) == EVMC_CREATE || (kind) == EVMC_CREATE2)
#define is_special_call(kind) \
((kind) == EVMC_CALLCODE || (kind) == EVMC_DELEGATECALL)
/* Max data buffer size: 24KB */
#define MAX_DATA_SIZE 24576
/* Max evm_memory size 512KB */
#define MAX_EVM_MEMORY_SIZE 524288
#define POLYJUICE_SYSTEM_PREFIX 0xFF
#define POLYJUICE_CONTRACT_CODE 0x01
#define POLYJUICE_DESTRUCTED 0x02
void polyjuice_build_system_key(uint32_t id, uint8_t polyjuice_field_type,
uint8_t key[GW_KEY_BYTES]) {
memset(key, 0, GW_KEY_BYTES);
memcpy(key, (uint8_t*)(&id), sizeof(uint32_t));
key[4] = POLYJUICE_SYSTEM_PREFIX;
key[5] = polyjuice_field_type;
}
void polyjuice_build_contract_code_key(uint32_t id, uint8_t key[GW_KEY_BYTES]) {
polyjuice_build_system_key(id, POLYJUICE_CONTRACT_CODE, key);
}
void polyjuice_build_destructed_key(uint32_t id, uint8_t key[GW_KEY_BYTES]) {
polyjuice_build_system_key(id, POLYJUICE_DESTRUCTED, key);
}
/* assume `account_id` already exists */
int gw_increase_nonce(gw_context_t *ctx, uint32_t account_id, uint32_t *new_nonce) {
uint32_t old_nonce;
int ret = ctx->sys_get_account_nonce(ctx, account_id, &old_nonce);
if (ret != 0) {
return ret;
}
uint32_t next_nonce = old_nonce + 1;
uint8_t nonce_key[GW_KEY_BYTES];
uint8_t nonce_value[GW_VALUE_BYTES];
memset(nonce_value, 0, GW_VALUE_BYTES);
gw_build_account_field_key(account_id, GW_ACCOUNT_NONCE, nonce_key);
memcpy(nonce_value, (uint8_t *)(&next_nonce), 4);
ret = ctx->_internal_store_raw(ctx, nonce_key, nonce_value);
if (ret != 0) {
return ret;
}
if (new_nonce != NULL) {
*new_nonce = next_nonce;
}
return 0;
}
int handle_message(gw_context_t* ctx,
uint32_t parent_from_id,
uint32_t parent_to_id,
evmc_address *parent_destination,
const evmc_message* msg, struct evmc_result* res);
typedef int (*stream_data_loader_fn)(gw_context_t* ctx, long data_id,
uint32_t* len, uint32_t offset,
uint8_t* data);
struct evmc_host_context {
gw_context_t* gw_ctx;
const uint8_t* code_data;
const size_t code_size;
// parent level call kind
enum evmc_call_kind kind;
uint32_t from_id;
uint32_t to_id;
// parent level sender
evmc_address sender;
// parent level destination
evmc_address destination;
int error_code;
};
int load_account_script(gw_context_t* gw_ctx, uint32_t account_id,
uint8_t* buffer, uint32_t buffer_size,
mol_seg_t* script_seg) {
debug_print_int("load_account_script, account_id:", account_id);
int ret;
uint64_t len = buffer_size;
ret = gw_ctx->sys_get_account_script(gw_ctx, account_id, &len, 0, buffer);
if (ret != 0) {
ckb_debug("load account script failed");
return ret;
}
script_seg->ptr = buffer;
script_seg->size = len;
if (MolReader_Script_verify(script_seg, false) != MOL_OK) {
ckb_debug("load account script: invalid script");
return FATAL_POLYJUICE;
}
return 0;
}
// TODO: change gas_limit, gas_price, value to u256
/**
Message = [
header : [u8; 8] 0xff, 0xff, 0xff, "POLY", call_kind
gas_limit : u64 (little endian)
gas_price : u128 (little endian)
value : u128 (little endian)
input_size : u32 (little endian)
input_data : [u8; input_size]
to_address : [u8; 20] optional, must be an EOA
]
*/
int parse_args(struct evmc_message* msg, gw_context_t* ctx) {
gw_transaction_context_t *tx_ctx = &ctx->transaction_context;
debug_print_int("args_len", tx_ctx->args_len);
if (tx_ctx->args_len < (8 + 8 + 16 + 16 + 4)) {
ckb_debug("invalid polyjuice arguments data");
return -1;
}
/* == Args decoder */
size_t offset = 0;
uint8_t* args = tx_ctx->args;
/**
* args[0..8] magic header + call kind
* Only access native eth_address after Polyjuice v1.0.0
*/
static const uint8_t eth_polyjuice_args_header[7]
= {0xff, 0xff, 0xff, 'P', 'O', 'L', 'Y'};
if (memcmp(eth_polyjuice_args_header, args, 7) != 0) {
debug_print_data("invalid polyjuice args header", args, 7);
return -1;
}
debug_print_int("[call_kind]", args[7]);
if (args[7] != EVMC_CALL && args[7] != EVMC_CREATE) {
ckb_debug("invalid call kind");
return -1;
}
evmc_call_kind kind = (evmc_call_kind)args[7];
offset += 8;
/* args[8..16] gas limit */
int64_t gas_limit;
memcpy(&gas_limit, args + offset, sizeof(int64_t));
offset += 8;
debug_print_int("[gas_limit]", gas_limit);
/* args[16..32] gas price */
memcpy(&g_gas_price, args + offset, sizeof(uint128_t));
offset += 16;
debug_print_int("[gas_price]", (int64_t)(g_gas_price));
/* args[32..48] transfer value */
evmc_uint256be value{0};
for (size_t i = 0; i < 16; i++) {
value.bytes[31 - i] = args[offset + i];
}
offset += 16;
/* args[48..52] */
uint32_t input_size = *((uint32_t*)(args + offset));
offset += 4;
debug_print_int("[input_size]", input_size);
if (input_size > tx_ctx->args_len) {
/* If input size large enough may overflow `input_size + offset` */
ckb_debug("input_size too large");
return -1;
}
/* args[52..52+input_size] */
uint8_t* input_data = args + offset;
offset += input_size;
if (offset + 20 == tx_ctx->args_len) { // This is a transfer tx.
if (kind != EVMC_CALL) {
ckb_debug("Native token transfer transaction only accepts CALL.");
return -1;
}
g_eoa_transfer_flag = true;
memcpy(g_eoa_transfer_to_address.bytes, args + offset, 20);
} else if (offset != tx_ctx->args_len) {
ckb_debug("invalid polyjuice transaction");
return -1;
}
msg->kind = kind;
msg->flags = 0;
msg->depth = 0;
msg->value = value;
msg->input_data = input_data;
msg->input_size = input_size;
msg->gas = gas_limit;
msg->sender = evmc_address{0};
msg->destination = evmc_address{0};
msg->create2_salt = evmc_bytes32{};
return 0;
}
void release_result(const struct evmc_result* result) {
if (result->output_data != NULL) {
free((void*)result->output_data);
}
return;
}
int load_account_code(gw_context_t* gw_ctx, uint32_t account_id,
uint64_t* code_size, uint64_t offset, uint8_t* code) {
int ret;
uint8_t buffer[GW_MAX_SCRIPT_SIZE];
mol_seg_t script_seg;
ret = load_account_script(gw_ctx, account_id, buffer, GW_MAX_SCRIPT_SIZE, &script_seg);
if (ret == GW_ERROR_ACCOUNT_NOT_EXISTS) {
// This is an EoA or other kind of account, and not yet created
debug_print_int("account not found", account_id);
*code_size = 0;
return 0;
}
if (ret != 0) {
return ret;
}
mol_seg_t code_hash_seg = MolReader_Script_get_code_hash(&script_seg);
mol_seg_t hash_type_seg = MolReader_Script_get_hash_type(&script_seg);
mol_seg_t args_seg = MolReader_Script_get_args(&script_seg);
mol_seg_t raw_args_seg = MolReader_Bytes_raw_bytes(&args_seg);
if (raw_args_seg.size != CONTRACT_ACCOUNT_SCRIPT_ARGS_LEN) {
debug_print_int("[load_account_code] invalid account script", account_id);
debug_print_int("[load_account_code] raw_args_seg.size", raw_args_seg.size);
// This is an EoA or other kind of account
*code_size = 0;
return 0;
}
if (memcmp(code_hash_seg.ptr, g_script_code_hash, 32) != 0
|| *hash_type_seg.ptr != g_script_hash_type
/* compare rollup_script_hash */
|| memcmp(raw_args_seg.ptr, g_rollup_script_hash, 32) != 0
/* compare creator account id */
|| memcmp(&g_creator_account_id, raw_args_seg.ptr + 32, sizeof(uint32_t)) != 0
) {
debug_print_int("[load_account_code] creator account id not match for account", account_id);
// This is an EoA or other kind of account
*code_size = 0;
return 0;
}
debug_print_int("[load_account_code] account_id", account_id);
uint8_t key[32];
uint8_t data_hash[32];
polyjuice_build_contract_code_key(account_id, key);
ret = gw_ctx->sys_load(gw_ctx, account_id, key, GW_KEY_BYTES, data_hash);
if (ret != 0) {
debug_print_int("[load_account_code] sys_load failed", ret);
return ret;
}
bool is_data_hash_zero = true;
for (size_t i = 0; i < 32; i++) {
if (data_hash[i] != 0) {
is_data_hash_zero = false;
break;
}
}
if (is_data_hash_zero) {
ckb_debug("[load_account_code] data hash all zero");
*code_size = 0;
return 0;
}
debug_print_int("[load_account_code] code_size before loading", *code_size);
ret = gw_ctx->sys_load_data(gw_ctx, data_hash, code_size, offset, code);
debug_print_int("[load_account_code] code_size after loading", *code_size);
if (ret != 0) {
ckb_debug("[load_account_code] sys_load_data failed");
return ret;
}
if (*code_size > MAX_DATA_SIZE) {
debug_print_int("[load_account_code] code_size can't be larger than",
MAX_DATA_SIZE);
return GW_FATAL_BUFFER_OVERFLOW;
}
return 0;
}
////////////////////////////////////////////////////////////////////////////////
//// Callbacks - EVMC Host Interfaces
////////////////////////////////////////////////////////////////////////////////
struct evmc_tx_context get_tx_context(struct evmc_host_context* context) {
struct evmc_tx_context ctx{0};
memcpy(ctx.tx_origin.bytes, g_tx_origin.bytes, 20);
evmc_uint256be gas_price = {0};
uint8_t* gas_price_ptr = (uint8_t*)(&g_gas_price);
for (int i = 0; i < 16; i++) {
gas_price.bytes[31 - i] = *(gas_price_ptr + i);
}
ctx.tx_gas_price = gas_price;
ctx.block_number = context->gw_ctx->block_info.number;
/*
block_timestamp => second
block_info.timestamp => millisecond
*/
ctx.block_timestamp = context->gw_ctx->block_info.timestamp / 1000;
/* Ethereum block gas limit */
ctx.block_gas_limit = 12500000;
/* 2500000000000000 */
ctx.block_difficulty = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x08, 0xe1, 0xbc, 0x9b, 0xf0, 0x40, 0x00,
};
uint8_t *chain_id_ptr = (uint8_t *)(&g_chain_id);
ctx.chain_id.bytes[31] = chain_id_ptr[0];
ctx.chain_id.bytes[30] = chain_id_ptr[1];
ctx.chain_id.bytes[29] = chain_id_ptr[2];
ctx.chain_id.bytes[28] = chain_id_ptr[3];
ctx.chain_id.bytes[27] = chain_id_ptr[4];
ctx.chain_id.bytes[26] = chain_id_ptr[5];
ctx.chain_id.bytes[25] = chain_id_ptr[6];
ctx.chain_id.bytes[24] = chain_id_ptr[7];
/* block_coinbase */
gw_reg_addr_t *block_producer = &context->gw_ctx->block_info.block_producer;
if (block_producer->reg_id != GW_DEFAULT_ETH_REGISTRY_ACCOUNT_ID
|| block_producer->addr_len != ETH_ADDRESS_LEN) {
ckb_debug("[get_tx_context] Error: block_producer is not an Ethereum EOA.");
ckb_debug("[get_tx_context] failed to load block_coinbase address");
context->error_code = GW_FATAL_INVALID_CONTEXT;
} else {
debug_print_data("load block_coinbase eth_address:",
block_producer->addr, ETH_ADDRESS_LEN);
memcpy(ctx.block_coinbase.bytes, block_producer->addr, ETH_ADDRESS_LEN);
}
return ctx;
}
bool account_exists(struct evmc_host_context* context,
const evmc_address* address) {
debug_print_data("BEGIN account_exists", address->bytes, 20);
uint8_t script_hash[32] = {0};
bool exists = true;
int ret = load_script_hash_by_eth_address(context->gw_ctx, address->bytes,
script_hash);
if (ret != 0) {
exists = false;
debug_print_int("[account_exists] load_script_hash_by_eth_address failed",
ret);
}
debug_print_int("END account_exists", (int)exists);
return exists;
}
evmc_bytes32 get_storage(struct evmc_host_context* context,
const evmc_address* address, const evmc_bytes32* key) {
ckb_debug("BEGIN get_storage");
evmc_bytes32 value{0};
int ret = context->gw_ctx->sys_load(context->gw_ctx, context->to_id,
key->bytes, GW_KEY_BYTES,
(uint8_t *)value.bytes);
if (ret != 0) {
debug_print_int("get_storage, sys_load failed", ret);
if (is_fatal_error(ret)) {
context->error_code = ret;
}
}
ckb_debug("END get_storage");
return value;
}
enum evmc_storage_status set_storage(struct evmc_host_context* context,
const evmc_address* address,
const evmc_bytes32* key,
const evmc_bytes32* value) {
ckb_debug("BEGIN set_storage");
evmc_storage_status status = EVMC_STORAGE_ADDED;
int ret = context->gw_ctx->sys_store(context->gw_ctx, context->to_id,
key->bytes, GW_KEY_BYTES, value->bytes);
if (ret != 0) {
debug_print_int("sys_store failed", ret);
if (is_fatal_error(ret)) {
context->error_code = ret;
}
status = EVMC_STORAGE_UNCHANGED;
}
/* TODO: more rich evmc_storage_status */
ckb_debug("END set_storage");
return status;
}
size_t get_code_size(struct evmc_host_context* context,
const evmc_address* address) {
ckb_debug("BEGIN get_code_size");
uint32_t account_id = 0;
int ret = load_account_id_by_eth_address(context->gw_ctx,
address->bytes, &account_id);
if (ret == GW_ERROR_NOT_FOUND) {
ckb_debug("END get_code_size");
return 0;
}
if (ret != 0) {
ckb_debug("get contract account id failed");
return 0;
}
uint8_t code[MAX_DATA_SIZE];
uint64_t code_size = MAX_DATA_SIZE;
ret = load_account_code(context->gw_ctx, account_id, &code_size, 0, code);
if (ret != 0) {
debug_print_int("[get_code_size] load_account_code failed", ret);
context->error_code = ret;
return 0;
}
ckb_debug("END get_code_size");
return code_size;
}
evmc_bytes32 get_code_hash(struct evmc_host_context* context,
const evmc_address* address) {
ckb_debug("BEGIN get_code_hash");
evmc_bytes32 hash{0};
uint32_t account_id = 0;
int ret = load_account_id_by_eth_address(context->gw_ctx,
address->bytes, &account_id);
if (ret == GW_ERROR_NOT_FOUND) {
ckb_debug("END get_code_hash");
return hash;
}
if (ret != 0) {
ckb_debug("get contract account id failed");
context->error_code = ret;
return hash;
}
uint8_t code[MAX_DATA_SIZE];
uint64_t code_size = MAX_DATA_SIZE;
ret = load_account_code(context->gw_ctx, account_id, &code_size, 0, code);
if (ret != 0) {
debug_print_int("[get_code_hash] load_account_code failed", ret);
context->error_code = ret;
return hash;
}
if (code_size > 0) {
union ethash_hash256 hash_result = ethash::keccak256(code, code_size);
memcpy(hash.bytes, hash_result.bytes, 32);
}
ckb_debug("END get_code_hash");
return hash;
}
/**
* @brief Copy code callback function.
*
* This callback function is used by an EVM to request a copy of the code of the
* given account to the memory buffer provided by the EVM. The Client MUST copy
* the requested code, starting with the given offset, to the provided memory
* buffer up to the size of the buffer or the size of the code, whichever is
* smaller.
*
* @param context The pointer to the Host execution context.
* @param address The address of the account.
* @param code_offset The offset of the code to copy.
* @param buffer_data The pointer to the memory buffer allocated by the EVM to
* store a copy of the requested code.
* @param buffer_size The size of the memory buffer.
* @return size_t The number of bytes copied to the buffer by the Client.
*/
size_t copy_code(struct evmc_host_context* context, const evmc_address* address,
size_t code_offset, uint8_t* buffer_data, size_t buffer_size) {
ckb_debug("BEGIN copy_code");
debug_print_int("[copy_code] code_offset", code_offset);
debug_print_int("[copy_code] buffer_size", buffer_size);
uint32_t account_id = 0;
int ret = load_account_id_by_eth_address(context->gw_ctx,
address->bytes, &account_id);
if (ret == GW_ERROR_NOT_FOUND) {
ckb_debug("END copy_code");
return 0;
}
if (ret != 0) {
ckb_debug("get contract account id failed");
context->error_code = ret;
return 0;
}
uint64_t code_size = buffer_size;
ret = load_account_code(context->gw_ctx, account_id, &code_size,
code_offset, buffer_data);
if (ret != 0) {
debug_print_int("[copy_code] load_account_code failed", ret);
context->error_code = ret;
return 0;
}
ckb_debug("END copy_code");
return code_size >= buffer_size ? buffer_size : code_size;
}
evmc_uint256be get_balance(struct evmc_host_context* context,
const evmc_address* address) {
ckb_debug("BEGIN get_balance");
evmc_uint256be balance{};
gw_reg_addr_t addr = new_reg_addr(address->bytes);
uint256_t value = {0};
int ret = sudt_get_balance(context->gw_ctx,
g_sudt_id, /* g_sudt_id account must exists */
addr, &value);
if (ret != 0) {
ckb_debug("sudt_get_balance failed");
context->error_code = FATAL_POLYJUICE;
return balance;
}
uint8_t* value_ptr = (uint8_t*)(&value);
for (int i = 0; i < 32; i++) {
balance.bytes[31 - i] = *(value_ptr + i);
}
debug_print_data("address", address->bytes, 20);
debug_print_data("balance", (uint8_t*)&value, 32);
ckb_debug("END get_balance");
return balance;
}
void selfdestruct(struct evmc_host_context* context,
const evmc_address* address,
const evmc_address* beneficiary) {
gw_reg_addr_t from_addr = new_reg_addr(address->bytes);
uint256_t balance;
int ret = sudt_get_balance(context->gw_ctx,
g_sudt_id, /* g_sudt_id account must exists */
from_addr, &balance);
if (ret != 0) {
ckb_debug("get balance failed");
context->error_code = ret;
return;
}
uint256_t zero = {0};
if (gw_uint256_cmp(balance, zero) == GW_UINT256_LARGER) {
gw_reg_addr_t to_addr = new_reg_addr(beneficiary->bytes);
ret = sudt_transfer(context->gw_ctx, g_sudt_id,
from_addr,
to_addr,
balance);
if (ret != 0) {
ckb_debug("transfer beneficiary failed");
context->error_code = ret;
return;
}
}
uint8_t raw_key[GW_KEY_BYTES];
uint8_t value[GW_VALUE_BYTES];
polyjuice_build_destructed_key(context->to_id, raw_key);
memset(value, 1, GW_VALUE_BYTES);
ret = context->gw_ctx->_internal_store_raw(context->gw_ctx, raw_key, value);
if (ret != 0) {
ckb_debug("update selfdestruct special key failed");
context->error_code = ret;
}
ckb_debug("END selfdestruct");
return;
}
struct evmc_result call(struct evmc_host_context* context,
const struct evmc_message* msg) {
ckb_debug("BEGIN call");
debug_print_int("msg.gas", msg->gas);
debug_print_int("msg.depth", msg->depth);
debug_print_int("msg.kind", msg->kind);
debug_print_data("call.sender", msg->sender.bytes, 20);
debug_print_data("call.destination", msg->destination.bytes, 20);
int ret;
struct evmc_result res;
memset(&res, 0, sizeof(res));
res.release = release_result;
gw_context_t* gw_ctx = context->gw_ctx;
precompiled_contract_gas_fn contract_gas;
precompiled_contract_fn contract;
if (match_precompiled_address(&msg->destination, &contract_gas, &contract)) {
uint64_t gas_cost = 0;
ret = contract_gas(msg->input_data, msg->input_size, &gas_cost);
if (is_fatal_error(ret)) {
context->error_code = ret;
}
if (ret != 0) {
ckb_debug("call pre-compiled contract gas failed");
res.status_code = EVMC_INTERNAL_ERROR;
return res;
}
if ((uint64_t)msg->gas < gas_cost) {
ckb_debug("call pre-compiled contract out of gas");
res.status_code = EVMC_OUT_OF_GAS;
return res;
}
res.gas_left = msg->gas - (int64_t)gas_cost;
ret = contract(gw_ctx,
context->code_data, context->code_size,
context->kind,
msg->flags == EVMC_STATIC,
msg->input_data, msg->input_size,
(uint8_t**)&res.output_data, &res.output_size);
if (is_fatal_error(ret)) {
context->error_code = ret;
}
if (ret != 0) {
debug_print_int("call pre-compiled contract failed", ret);
res.status_code = EVMC_INTERNAL_ERROR;
return res;
}
res.status_code = EVMC_SUCCESS;
} else {
ret = handle_message(gw_ctx, context->from_id, context->to_id,
&context->destination, msg, &res);
if (is_fatal_error(ret)) {
/* stop as soon as possible */
context->error_code = ret;
}
if (ret != 0) {
debug_print_int("inner call failed (transfer/contract call contract)", ret);
if (is_evmc_error(ret)) {
res.status_code = (evmc_status_code)ret;
} else {
res.status_code = EVMC_INTERNAL_ERROR;
}
}
}
debug_print_int("call.res.status_code", res.status_code);
ckb_debug("END call");
return res;
}
evmc_bytes32 get_block_hash(struct evmc_host_context* context, int64_t number) {
ckb_debug("BEGIN get_block_hash");
evmc_bytes32 block_hash{};
int ret = context->gw_ctx->sys_get_block_hash(context->gw_ctx, number,
(uint8_t*)block_hash.bytes);
if (ret != 0) {
ckb_debug("sys_get_block_hash failed");
context->error_code = ret;
return block_hash;
}
ckb_debug("END get_block_hash");
return block_hash;
}
void emit_log(struct evmc_host_context* context, const evmc_address* address,
const uint8_t* data, size_t data_size,
const evmc_bytes32 topics[], size_t topics_count) {
ckb_debug("BEGIN emit_log");
/*
output[ 0..20] = callee_contract.address
output[20..24] = data_size_u32
output[24..24+data_size] = data
ouptut[24+data_size..28+data_size] = topics_count_u32
ouptut[28+data_size..] = topics
*/
size_t output_size = 20 + (4 + data_size) + (4 + topics_count * 32);
uint8_t* output = (uint8_t*)malloc(output_size);
if (output == NULL) {
context->error_code = -1;
return;
}
uint32_t data_size_u32 = (uint32_t)(data_size);
uint32_t topics_count_u32 = (uint32_t)(topics_count);
uint8_t* output_current = output;
memcpy(output_current, address->bytes, 20);
output_current += 20;
memcpy(output_current, (uint8_t*)(&data_size_u32), 4);
output_current += 4;
if (data_size > 0) {
memcpy(output_current, data, data_size);
output_current += data_size;
}
memcpy(output_current, (uint8_t*)(&topics_count_u32), 4);
output_current += 4;
for (size_t i = 0; i < topics_count; i++) {
debug_print_data("log.topic", topics[i].bytes, 32);
memcpy(output_current, topics[i].bytes, 32);
output_current += 32;
}
int ret = context->gw_ctx->sys_log(context->gw_ctx, context->to_id,
GW_LOG_POLYJUICE_USER, (uint32_t)output_size, output);
if (ret != 0) {
ckb_debug("sys_log failed");
context->error_code = ret;
}
free(output);
ckb_debug("END emit_log");
return;
}
/**
* check address collision
* check existence of eth_addr
* If it's an EoA address with non-zero nonce or it's an contract address, it can't be overwrite.
* @param overwrite true if there is a collision but we can continue to create a new account
* @return 0 means success
*/
int check_address_collision(gw_context_t* ctx, const uint8_t eth_addr[ETH_ADDRESS_LEN], bool* overwrite) {
gw_reg_addr_t addr = new_reg_addr(eth_addr);
uint8_t script_hash[32] = {0};
int ret = ctx->sys_get_script_hash_by_registry_address(ctx, &addr, script_hash);
if (ret == GW_ERROR_NOT_FOUND) {
return 0;
}
if (ret != 0) {
return ret;
}
uint32_t account_id;
ret = ctx->sys_get_account_id_by_script_hash(ctx, script_hash, &account_id);
if (ret != 0) {
return ret;
}
// account exists
uint32_t nonce;
ret = ctx->sys_get_account_nonce(ctx, account_id, &nonce);
if (ret != 0) {
return ret;
}
uint8_t code[MAX_DATA_SIZE];
uint64_t code_size = MAX_DATA_SIZE;
ret = load_account_code(ctx, account_id, &code_size, 0, code);
if (ret != 0) {
return ret;
}
// check nonce and EOA
if (nonce > 0 || code_size > 0) {
return ERROR_CONTRACT_ADDRESS_COLLISION;
}
// There is a collision. We can create a new account and re-map.
*overwrite = true;
ckb_debug("[address collision] continue and re-map");
return 0;
}
/**
* @return 0 if the `to_id` account is not destructed
*/
int check_destructed(gw_context_t* ctx, uint32_t to_id) {
int ret;
uint8_t destructed_raw_key[GW_KEY_BYTES];
uint8_t destructed_raw_value[GW_VALUE_BYTES] = {0};
polyjuice_build_destructed_key(to_id, destructed_raw_key);
ret = ctx->_internal_load_raw(ctx, destructed_raw_key, destructed_raw_value);
if (ret != 0) {
debug_print_int("load destructed key failed", ret);
return ret;
}
bool destructed = true;
for (int i = 0; i < GW_VALUE_BYTES; i++) {
if (destructed_raw_value[i] == 0) {
destructed = false;
break;
}
}
if (destructed) {
ckb_debug("call a contract that was already destructed");
return FATAL_POLYJUICE;
}
return 0;
}
/**
* load the following global values:
* - g_chain_id
* - g_creator_account_id
* - g_script_hash_type
* - g_rollup_script_hash
* - g_sudt_id
*/
int load_globals(gw_context_t* ctx, uint32_t to_id) {
uint8_t buffer[GW_MAX_SCRIPT_SIZE];
mol_seg_t script_seg;
int ret = load_account_script(ctx, to_id, buffer, GW_MAX_SCRIPT_SIZE, &script_seg);
if (ret != 0) {
return ret;
}
mol_seg_t code_hash_seg = MolReader_Script_get_code_hash(&script_seg);
mol_seg_t hash_type_seg = MolReader_Script_get_hash_type(&script_seg);
mol_seg_t args_seg = MolReader_Script_get_args(&script_seg);
mol_seg_t raw_args_seg = MolReader_Bytes_raw_bytes(&args_seg);
memcpy(g_script_code_hash, code_hash_seg.ptr, 32);
g_script_hash_type = *hash_type_seg.ptr;
uint8_t creator_script_buffer[GW_MAX_SCRIPT_SIZE];
mol_seg_t creator_script_seg;
mol_seg_t creator_raw_args_seg;
if (raw_args_seg.size == CREATOR_SCRIPT_ARGS_LEN) {
/* polyjuice creator account */
g_creator_account_id = to_id;
creator_raw_args_seg = raw_args_seg;
} else if (raw_args_seg.size == CONTRACT_ACCOUNT_SCRIPT_ARGS_LEN) {
/* read creator account id and do some checking */
memcpy(&g_creator_account_id, raw_args_seg.ptr + 32, sizeof(uint32_t));
int ret = load_account_script(ctx,
g_creator_account_id,
creator_script_buffer,
GW_MAX_SCRIPT_SIZE,
&creator_script_seg);
if (ret != 0) {
return ret;
}
mol_seg_t creator_code_hash_seg = MolReader_Script_get_code_hash(&creator_script_seg);
mol_seg_t creator_hash_type_seg = MolReader_Script_get_hash_type(&creator_script_seg);
mol_seg_t creator_args_seg = MolReader_Script_get_args(&creator_script_seg);
creator_raw_args_seg = MolReader_Bytes_raw_bytes(&creator_args_seg);
if (memcmp(creator_code_hash_seg.ptr, code_hash_seg.ptr, 32) != 0
|| *creator_hash_type_seg.ptr != *hash_type_seg.ptr
/* compare rollup_script_hash */
|| memcmp(creator_raw_args_seg.ptr, raw_args_seg.ptr, 32) != 0
|| creator_raw_args_seg.size != CREATOR_SCRIPT_ARGS_LEN) {
debug_print_int("invalid creator account id in normal contract account script args",
g_creator_account_id);
return FATAL_POLYJUICE;
}
} else {
debug_print_data("invalid to account script args", raw_args_seg.ptr, raw_args_seg.size);
return FATAL_POLYJUICE;
}
/** read g_chain_id from Godwoken RollupConfig */
mol_seg_t rollup_config_seg;
rollup_config_seg.ptr = ctx->rollup_config;
rollup_config_seg.size = ctx->rollup_config_size;
mol_seg_t id_u64_seg = MolReader_RollupConfig_get_chain_id(&rollup_config_seg);
memcpy(&g_chain_id, id_u64_seg.ptr, id_u64_seg.size);
debug_print_int("chain_id", g_chain_id);
debug_print_int("creator_account_id", g_creator_account_id);
/** read rollup_script_hash and g_sudt_id from creator account */
memcpy(g_rollup_script_hash, creator_raw_args_seg.ptr, 32);
memcpy(&g_sudt_id, creator_raw_args_seg.ptr + 32, sizeof(uint32_t));
debug_print_data("g_rollup_script_hash", g_rollup_script_hash, 32);
debug_print_int("g_sudt_id", g_sudt_id);
return 0;
}
int create_new_account(gw_context_t* ctx,
const evmc_message* msg,
uint32_t from_id,
uint32_t* to_id,
uint8_t* code_data,
size_t code_size) {
if (code_size == 0) {
ckb_debug("[create_new_account] can't create new account by empty code data");
return FATAL_POLYJUICE;
}
int ret = 0;
uint8_t script_args[CONTRACT_ACCOUNT_SCRIPT_ARGS_LEN];
uint8_t data[128] = {0};
uint32_t data_len = 0;
if (msg->kind == EVMC_CREATE) {
/* normal contract account script.args[36..36+20] content before hash
Include:
- [20 bytes] sender address
- [4 bytes] sender nonce (NOTE: only use first 4 bytes (u32))
Above data will be RLP encoded.
*/
ckb_debug("[create_new_account] msg->kind == EVMC_CREATE");
uint32_t nonce;
/* from_id must already exists */
ret = ctx->sys_get_account_nonce(ctx, from_id, &nonce);
if (ret != 0) {
return ret;
}
debug_print_data("sender", msg->sender.bytes, 20);
debug_print_int("from_id", from_id);
debug_print_int("nonce", nonce);
rlp_encode_sender_and_nonce(&msg->sender, nonce, data, &data_len);
} else if (msg->kind == EVMC_CREATE2) {
/* CREATE2 contract account script.args[36..36+20] content before hash
Include:
- [ 1 byte ] 0xff (refer to ethereum)
- [20 bytes] sender address
- [32 bytes] create2_salt
- [32 bytes] keccak256(init_code)
*/
ckb_debug("[create_new_account] msg->kind == EVMC_CREATE2");
union ethash_hash256 hash_result = ethash::keccak256(code_data, code_size);
data[0] = 0xff;
memcpy(data + 1, msg->sender.bytes, 20);
memcpy(data + 1 + 20, msg->create2_salt.bytes, 32);
memcpy(data + 1 + 20 + 32, hash_result.bytes, 32);
data_len = 1 + 20 + 32 + 32;
} else {
ckb_debug("[create_new_account] unreachable");
return FATAL_POLYJUICE;
}
/* contract account script.args
Include:
- [32 bytes] rollup type hash
- [ 4 bytes] little endian creator_account_id, it's Polyjuice Root Account
- [20 bytes] keccak256(data)[12..]
*/
memcpy(script_args, g_rollup_script_hash, 32);
memcpy(script_args + 32, (uint8_t*)(&g_creator_account_id), 4);
union ethash_hash256 data_hash_result = ethash::keccak256(data, data_len);
uint8_t *eth_addr = data_hash_result.bytes + 12;
memcpy(script_args + 32 + 4, eth_addr, ETH_ADDRESS_LEN);
bool overwrite = false;
ret = check_address_collision(ctx, eth_addr, &overwrite);
if (ret != 0) {
return ret;
}
mol_seg_t new_script_seg;
uint32_t new_account_id;
ret = build_script(g_script_code_hash, g_script_hash_type, script_args,
CONTRACT_ACCOUNT_SCRIPT_ARGS_LEN, &new_script_seg);
if (ret != 0) {
return ret;
}
uint8_t script_hash[32];
blake2b_hash(script_hash, new_script_seg.ptr, new_script_seg.size);
ret = ctx->sys_create(ctx, new_script_seg.ptr, new_script_seg.size, &new_account_id);
if (ret != 0) {
debug_print_int("sys_create error", ret);
// create account failed assume account already created by meta_contract
ret = ctx->sys_get_account_id_by_script_hash(ctx, script_hash, &new_account_id);
if (ret != 0) {
return ret;
}
}
free(new_script_seg.ptr);
*to_id = new_account_id;
memcpy((uint8_t *)msg->destination.bytes, eth_addr, 20);
debug_print_int(">> new to id", *to_id);
// register a created contract account into `ETH Address Registry`
ret = gw_update_eth_address_register(ctx, eth_addr, script_hash, overwrite);
if (ret != 0) {
ckb_debug("[create_new_account] failed to register a contract account");
return ret;
}
return 0;
}
int handle_transfer(gw_context_t* ctx,
const evmc_message* msg,
bool to_address_is_eoa) {
uint256_t value;
uint8_t* value_ptr = (uint8_t*)&value;
for (int i = 0; i < 32; i++) {
value_ptr[i] = msg->value.bytes[31 - i];
}
debug_print_data("[handle_transfer] sender", msg->sender.bytes, 20);
debug_print_data("[handle_transfer] destination", msg->destination.bytes, 20);
debug_print_data("[handle_transfer] msg->value", (uint8_t*)&value, 32);
if (msg->kind == EVMC_CALL