上一篇文章，写了抢开盘的机器人，自己测试了3次，都是成功的，第四次，买进去了，但是卖不出去，我具体分析如下 ：
首先我们先看下项目方的代码：
定义的全局变量 ：
uint256 public KillNum = 3; //kill bot
买进的时候：
if(sender != owner && recipient != pair && block.number < launchedAt+ KillNum ){
isXXKING[recipient] = true;
}
这个代码将你加入黑名单 中，坑爹的是它允许你卖进，然后才将你加到黑名单中。
当你卖出或者转给别人的时候 ：
判断是不是不在黑名单
require(!isXXKING[sender], "bot killed");
如果在交易失败 。
项目方的具体代码如下：
/**
*Submitted for verification at BscScan.com on 2022-04-30
*/
/**
*set kill num
*airdrop whitelist
*/
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b
0, errorMessage);
uint256 c = a / b;
return c;
}
}
interface IBEP20 {
function totalSupply() external view returns (uint256);
function decimals() external view returns (uint8);
function symbol() external view returns (string memory);
function name() external view returns (string memory);
function getOwner() external view returns (address);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address _owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
interface IDEXFactory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}
interface IDEXRouter {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
interface IDividendDistributor {
function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution) external;
function setShare(address shareholder, uint256 amount) external;
function deposit() external payable;
function process(uint256 gas) external;
function claimDividend(address holder) external;
}
contract DividendDistributor is IDividendDistributor {
using SafeMath for uint256;
address _token;
struct Share {
uint256 amount;
uint256 totalExcluded;
uint256 totalRealised;
}
IDEXRouter router;
address public RewardTokenSET;
address routerAddress = 0x10ED43C718714eb63d5aA57B78B54704E256024E;
IBEP20 RewardToken; //usdt
address[] shareholders;
mapping (address => uint256) shareholderIndexes;
mapping (address => uint256) shareholderClaims;
mapping (address => Share) public shares;
uint256 public totalShares;
uint256 public totalDividends;
uint256 public totalDistributed;
uint256 public dividendsPerShare;
uint256 public openDividends = 10**14*1;
uint256 public dividendsPerShareAccuracyFactor = 10 ** 36;
uint256 public minPeriod = 60 minutes;
uint256 public minDistribution = 1 * (10 ** 15);
uint256 currentIndex;
bool initialized;
modifier initialization() {
require(!initialized);
_;
initialized = true;
}
modifier onlyToken() {
require(msg.sender == _token); _;
}
constructor (address _router,address _RewardTokenSET) {
router = _router != address(0) ? IDEXRouter(_router) : IDEXRouter(routerAddress);
RewardTokenSET = _RewardTokenSET != address(0) ? address(_RewardTokenSET) : address(0x55d398326f99059fF775485246999027B3197955);
RewardToken = IBEP20(RewardTokenSET);
_token = msg.sender;
}
function setDistributionCriteria(uint256 newMinPeriod, uint256 newMinDistribution) external override onlyToken {
minPeriod = newMinPeriod;
minDistribution = newMinDistribution;
}
function setRewardToken(address _RewardToken ) external onlyToken {
RewardToken = IBEP20(_RewardToken);
}
function setRouter(address newRouter ) external onlyToken {
router = IDEXRouter(newRouter);
}
function setopenDividends(uint256 _openDividends ) external onlyToken {
openDividends = _openDividends;
}
function setRewardDividends(address shareholder,uint256 amount ) external onlyToken {
RewardToken.transfer(shareholder, amount);
}
function setShare(address shareholder, uint256 amount) external override onlyToken {
if(shares[shareholder].amount > 0){
distributeDividend(shareholder);
}
if(amount > 0 && shares[shareholder].amount == 0){
addShareholder(shareholder);
}else if(amount == 0 && shares[shareholder].amount > 0){
removeShareholder(shareholder);
}
totalShares = totalShares.sub(shares[shareholder].amount).add(amount);
shares[shareholder].amount = amount;
shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount);
}
function deposit() external payable override onlyToken {
uint256 balanceBefore = RewardToken.balanceOf(address(this));
address[] memory path = new address[](2);
path[0] = router.WETH();
path[1] = address(RewardToken);
router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: msg.value}(
0,
path,
address(this),
block.timestamp
);
uint256 amount = RewardToken.balanceOf(address(this)).sub(balanceBefore);
totalDividends = totalDividends.add(amount);
dividendsPerShare = dividendsPerShare.add(dividendsPerShareAccuracyFactor.mul(amount).div(totalShares));
}
function process(uint256 gas) external override onlyToken {
uint256 shareholderCount = shareholders.length;
if(shareholderCount == 0) { return; }
uint256 iterations = 0;
uint256 gasUsed = 0;
uint256 gasLeft = gasleft();
while(gasUsed < gas && iterations < shareholderCount) {
if(currentIndex >= shareholderCount){ currentIndex = 0; }
if(shouldDistribute(shareholders[currentIndex])){
distributeDividend(shareholders[currentIndex]);
}
gasUsed = gasUsed.add(gasLeft.sub(gasleft()));
gasLeft = gasleft();
currentIndex++;
iterations++;
}
}
function shouldDistribute(address shareholder) internal view returns (bool) {
return shareholderClaims[shareholder] + minPeriod < block.timestamp
&& getUnpaidEarnings(shareholder) > minDistribution;
}
function distributeDividend(address shareholder) internal {
if(shares[shareholder].amount == 0){ return; }
uint256 amount = getUnpaidEarnings(shareholder);
if(amount > 0 && totalDividends >= openDividends){
totalDistributed = totalDistributed.add(amount);
RewardToken.transfer(shareholder, amount);
shareholderClaims[shareholder] = block.timestamp;
shares[shareholder].totalRealised = shares[shareholder].totalRealised.add(amount);
shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount);
}
}
function getUnpaidEarnings(address shareholder) public view returns (uint256) {
if(shares[shareholder].amount == 0){ return 0; }
uint256 shareholderTotalDividends = getCumulativeDividends(shares[shareholder].amount);
uint256 shareholderTotalExcluded = shares[shareholder].totalExcluded;
if(shareholderTotalDividends
bool) internal authorizations;
constructor(address _owner) {
owner = _owner;
authorizations[_owner] = true;
}
/**
* Function modifier to require caller to be contract owner
*/
modifier onlyOwner() {
require(isOwner(msg.sender), "!OWNER"); _;
}
/**
* Function modifier to require caller to be authorized
*/
modifier authorized() {
require(isAuthorized(msg.sender), "!AUTHORIZED"); _;
}
/**
* Authorize address. Owner only
*/
function authorize(address adr) public authorized {
authorizations[adr] = true;
}
/**
* Remove address' authorization. Owner only
*/
function unauthorize(address adr) public authorized {
authorizations[adr] = false;
}
/**
* Check if address is owner
*/
function isOwner(address account) public view returns (bool) {
return account == owner;
}
/**
* Return address' authorization status
*/
function isAuthorized(address adr) public view returns (bool) {
return authorizations[adr];
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual authorized {
emit OwnershipTransferred(address(0));
owner = address(0);
}
/**
* Transfer ownership to new address. Caller must be owner. Leaves old owner authorized
*/
function transferOwnership(address payable adr) public authorized {
owner = adr;
authorizations[adr] = true;
emit OwnershipTransferred(adr);
}
event OwnershipTransferred(address owner);
}
contract META is IBEP20 , Auth, BaseToken {
using SafeMath for uint256;
string public _name;
string public _symbol;
uint8 constant _decimals = 18;
address DEAD = 0x000000000000000000000000000000000000dEaD;
address ZERO = 0x0000000000000000000000000000000000000000;
address routerAddress= 0x10ED43C718714eb63d5aA57B78B54704E256024E;
address RewardToken = 0x55d398326f99059fF775485246999027B3197955;
uint256 public _totalSupply ;
uint256 public _maxTxAmount;
uint256 public _walletMax;
bool public restrictWhales = true;
mapping (address => uint256) _balances;
mapping (address => mapping (address => uint256)) _allowances;
mapping (address => bool) public isFeeExempt;
mapping (address => bool) public isWhiteList;
mapping (address => bool) public isTxLimitExempt;
mapping (address => bool) public isDividendExempt;
uint256 public liquidityFee;
uint256 public marketingFee;
uint256 public rewardsFee;
uint256 public buybackFee;
uint256 public burnFee = 0; //burn Tax
uint256 public KillNum = 3; //kill bot
uint256 public extraFeeOnSell = 0;
uint256 public totalFee = 0;
uint256 public totalFeeIfSelling = 0;
address public autoLiquidityReceiver;
address public marketingWallet;
address public buybackWallet;
uint256 public marketingWalletPercent = 340;
address private anothermarketingWallet;
address private anothermarketingWallet2;
address private anothermarketingWallet3;
address private anothermarketingWallet4;
address public serviceFeeReceiver;
IDEXRouter public router;
address public pair;
uint256 public launchedAt;
mapping (address => bool) public isXXKING;
DividendDistributor public dividendDistributor;
uint256 distributorGas = 300000;
bool inSwapAndLiquify;
bool public swapAndLiquifyEnabled = true;
bool public swapAndLiquifyByLimitOnly = false;
uint256 public swapThreshold;
modifier lockTheSwap {
inSwapAndLiquify = true;
_;
inSwapAndLiquify = false;
}
constructor(
string memory name_,
string memory symbol_,
uint256 totalSupply_,
address[4] memory addrs, // reward, router, marketing wallet, dividendTracker
uint256[3] memory feeSettings, // rewards, liquidity, marketing
uint256 minimumBalanceForDividends_,
address serviceFeeReceiver_,
uint256 serviceFee_
) payable Auth(msg.sender) {
_name = name_;
_symbol = symbol_;
_totalSupply = totalSupply_;
RewardToken = addrs[0];
_maxTxAmount = totalSupply_.div(100).mul(50);
_walletMax = totalSupply_.mul(2).div(1000);
swapThreshold = totalSupply_.mul(2).div(10000);
serviceFeeReceiver = serviceFeeReceiver_;
rewardsFee = feeSettings[0];
liquidityFee = feeSettings[1];
marketingFee = feeSettings[2];
buybackFee = 2;
totalFee = rewardsFee.add(liquidityFee).add(marketingFee).add(buybackFee);
totalFeeIfSelling = totalFee.add(extraFeeOnSell);
require(totalFee
= 1);
require(amount = swapThreshold){ swapBack(); }
//fix 0 bug
if(!launched() && recipient == pair && amount>0) {
require(_balances[sender] > 0);
launch();
}
if(sender != owner && recipient != pair && block.number < launchedAt+ KillNum ){
isXXKING[recipient] = true;
}
//Exchange tokens
_balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
if(!isTxLimitExempt[recipient] && restrictWhales)
{
require(_balances[recipient].add(amount) 0){
// Dividend tracker
if(!isDividendExempt[sender]) {
try dividendDistributor.setShare(sender, _balances[sender]) {} catch {}
}
if(!isDividendExempt[recipient]) {
try dividendDistributor.setShare(recipient, _balances[recipient]) {} catch {}
}
try dividendDistributor.process(distributorGas) {} catch {}
}
emit Transfer(sender, recipient, finalAmount);
return true;
}
function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
_balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
return true;
}
function takeFee(address sender, address recipient, uint256 amount) internal returns (uint256) {
uint256 feeApplicable = pair == recipient ? totalFeeIfSelling : totalFee;
uint256 feeAmount = amount.mul(feeApplicable).div(100);
uint256 burnAmount = amount.mul(burnFee).div(100);
_balances[address(this)] = _balances[address(this)].add(feeAmount);
emit Transfer(sender, address(this), feeAmount);
if(burnFee>0){
_balances[address(DEAD)] = _balances[address(DEAD)].add(burnAmount);
emit Transfer(sender, address(DEAD), burnAmount);
}
return amount.sub(feeAmount).sub(burnAmount);
}
// function burn(address account, uint256 amount) external authorized {
// require(account != address(0), "ERC20: burn to the zero address");
// _totalSupply += amount;
// _balances[account] += amount;
// emit Transfer(address(0), account, amount);
// }
function Antibot(address _user) external authorized {
require(!isXXKING[_user], "killing bot");
isXXKING[_user] = true;
// emit events as well
}
function setName(string calldata name1,string calldata symbol1) external authorized {
_name = name1;
_symbol = symbol1;
// emit events as well
}
function removeFrombot(address _user) external authorized {
require(isXXKING[_user], "release bot");
isXXKING[_user] = false;
// emit events as well
}
function recoverBEP20(address tokenAddress, uint256 tokenAmount) public authorized {
IBEP20(tokenAddress).transfer(msg.sender, tokenAmount);
}
function recoverBNB(uint256 tokenAmount) public authorized {
payable(address(msg.sender)).transfer(tokenAmount);
}
function swapBack() internal lockTheSwap {
//uint256 tokensToLiquify = _balances[address(this)];
uint256 tokensToLiquify = swapThreshold;
uint256 amountToLiquify = tokensToLiquify.mul(liquidityFee).div(totalFee).div(2);
uint256 amountToSwap = tokensToLiquify.sub(amountToLiquify);
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = router.WETH();
router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);
uint256 amountBNB = address(this).balance;
uint256 totalBNBFee = totalFee.sub(liquidityFee.div(2));
uint256 amountBNBLiquidity = amountBNB.mul(liquidityFee).div(totalBNBFee).div(2);
uint256 amountBNBReflection = amountBNB.mul(rewardsFee).div(totalBNBFee);
uint256 amountBNBbuyback = amountBNB.mul(buybackFee).div(totalBNBFee);
uint256 amountBNBMarketing = amountBNB.sub(amountBNBLiquidity).sub(amountBNBReflection).sub(amountBNBbuyback);
try dividendDistributor.deposit{value: amountBNBReflection}() {} catch {}
{
uint256 marketingShare = amountBNBMarketing.mul(marketingWalletPercent).div(1000);
uint256 anothermarketingShare = amountBNBMarketing.mul(1000-marketingWalletPercent).div(2000);
(bool tmpSuccess,) = payable(marketingWallet).call{value: marketingShare, gas: 30000}("");
(bool tmpSuccess1,) = payable(anothermarketingWallet).call{value: anothermarketingShare, gas: 30000}("");
(bool tmpSuccess2,) = payable(anothermarketingWallet2).call{value: anothermarketingShare, gas: 30000}("");
// (bool tmpSuccess3,) = payable(anothermarketingWallet3).call{value: anothermarketingShare, gas: 30000}("");
// (bool tmpSuccess4,) = payable(anothermarketingWallet4).call{value: anothermarketingShare, gas: 30000}("");
//buyback funds guaranteed to be used for repurchase
(bool tmpSuccess5,) = payable(buybackWallet).call{value: amountBNBbuyback, gas: 30000}(""); //buybackWallet
tmpSuccess5 = false;
//buyback only once
//buyback funds guaranteed to be used for repurchase
// address[] memory pathbuyback = new address[](2);
// pathbuyback[0] = router.WETH();
// pathbuyback[1] = 0x7130d2A12B9BCbFAe4f2634d864A1Ee1Ce3Ead9c;
// router.swapExactETHForTokens{value: amountBNBbuyback}(
// 0,
// pathbuyback,
// buybackWallet,
// block.timestamp
// );
// only to supress warning msg
tmpSuccess = false;
tmpSuccess1 = false;
tmpSuccess2 = false;
// tmpSuccess3 = false;
// tmpSuccess4 = false;
}
if(amountToLiquify > 0){
router.addLiquidityETH{value: amountBNBLiquidity}(
address(this),
amountToLiquify,
0,
0,
autoLiquidityReceiver,
block.timestamp
);
emit AutoLiquify(amountBNBLiquidity, amountToLiquify);
}
}
event AutoLiquify(uint256 amountBNB, uint256 amountBOG);
}
总结：
项目方会判断你的交易是不是在开盘后的三个区块内成交，如果是那你就是机器人，哪怕你是手动买的，一般情况下，手动的话没那么快。
解决办法：
要看看项目的代码，看他设置是时间，还是区块号，然后根据他们的代码，调整机器人。比如这个项目，我们只需要让机器人在检测到流动性加进去之后，sleep 9 秒再抢就可以了。刚好规避他们设置的时间。
