Merge pull request #482 from embark-framework/fuzzer

Fuzzer

lib/core/engine.js

@@ -187,6 +187,7 @@ class Engine {
     this.registerModule('solidity', {ipc: this.ipc});
     this.registerModule('vyper');
     this.registerModule('profiler');
+    this.registerModule('fuzzer');
     this.registerModule('deploytracker');
     this.registerModule('specialconfigs');
 

lib/modules/fuzzer/index.js

@@ -0,0 +1,111 @@
+const utils = require('web3-utils');
+const _ = require('underscore');
+
+
+// generates random inputs based on the inputs of an ABI
+class ContractFuzzer {
+  constructor(embark) {
+    this.embark = embark;
+    this.logger = embark.logger;
+    this.events = embark.events;
+
+    this.registerConsoleCommand();
+  }
+
+  // main function to call, takes in iteration number and a contract and returns a map object
+  // composed of method names -> fuzzed inputs. 
+  generateFuzz(iterations, contract) {
+    const self = this;
+    let fuzzMap = {};
+    for (let i = 0; i < iterations; i++) {
+      contract.abiDefinition.filter((x) => x.inputs && x.inputs.length != 0).forEach((abiMethod) => {
+        let name = abiMethod.type === "constructor" ? "constructor" : abiMethod.name;
+        let inputTypes = abiMethod.inputs.map(input => input.type);
+        fuzzMap[name] = inputTypes.map(input => this.getTypeFuzz(input));
+      });
+    }
+    for (let key in fuzzMap) self.logger.info(key + ":" + fuzzMap[key]);
+    return fuzzMap;
+  }
+
+  getTypeFuzz(typeString) {
+    const self = this;
+    // Group 0: uint256[3]
+    // Group 1: uint256
+    // Group 2: uint
+    // Group 3: 256
+    // Group 4: [3]
+    // Group 5: 3
+    let regexObj = typeString.match(/((bool|int|uint|bytes|string|address)([0-9]*)?)(\[([0-9]*)\])*$/);
+    let type = regexObj[1];
+    let kind = regexObj[2];
+    let size = regexObj[3];
+    let array = regexObj[4];
+    let arraySize = regexObj[5];
+    switch(true) {
+      case array !== undefined: {
+        // if it's a dynamic array pick a number between 1 and 256 for length of array
+        let length = arraySize === undefined || arraySize === null || arraySize === '' ? Math.floor((Math.random() * 256) + 1)  : arraySize;
+        return self.generateArrayOfType(length, type);
+      }
+      case kind == "bool":
+        return self.generateRandomBool();
+      case kind == "uint" || kind == "int":
+        return self.generateRandomInt(size);
+      case kind === "bytes" && size !== undefined:
+        return self.generateRandomStaticBytes(size);
+      case kind === "string" || kind === "bytes":
+        return self.generateRandomDynamicType();
+      case kind === "address":
+        return self.generateRandomAddress();
+      default:
+        throw new Error("Couldn't find proper ethereum abi type");
+    }
+  }
+
+  generateRandomBool() {
+    return _.sample([true, false]);
+  }
+
+  generateArrayOfType(length, type) {
+    var arr = [];
+    for (var i = 0; i < length; i++) arr.push(this.getTypeFuzz(type));
+    return arr;
+  }
+
+  generateRandomDynamicType() {
+    return Math.random().toString(36).slice(2);
+  }
+
+  generateRandomStaticBytes(size) {
+    return utils.randomHex(size);
+  }
+
+  generateRandomInt(size) {
+    return utils.toBN(utils.randomHex(size / 8));
+  }
+
+  generateRandomAddress() {
+    return utils.randomHex(20);
+  }
+
+  registerConsoleCommand() {
+    const self = this;
+    self.embark.registerConsoleCommand((cmd, _options) => {
+      let splitCmd = cmd.split(' ');
+      let cmdName = splitCmd[0];
+      let contractName = splitCmd[1];
+      let iterations = splitCmd[2] === undefined ? 1 : splitCmd[2];
+      if (cmdName === 'fuzz') {
+        self.events.request('contracts:contract', contractName, (contract) => {
+          self.logger.info("--  fuzzed vals for " + contractName);
+             this.generateFuzz(iterations, contract);
+        });
+        return "";
+      }
+      return false;
+    });
+  }
+}
+
+module.exports = ContractFuzzer;

package-lock.json

@@ -92,7 +92,7 @@
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       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
-      "integrity": "sha1-+PLIh60Qv2f2NPAFtph/7TF5qsg="
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
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@@ -114,7 +114,7 @@
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       "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.5.3.tgz",
-      "integrity": "sha1-9HPdR+AnegjijpvsWu6wR1HwuMk="
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@@ -484,7 +484,7 @@
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       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
-      "integrity": "sha1-vNZ5HqWuCXJeF+WtmIE0zUCz2RE=",
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@@ -500,7 +500,7 @@
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-      "integrity": "sha1-NgSLv/TntH4TZkQxbJlmnqWukfE="
+      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg=="
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@@ -559,7 +559,7 @@
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       "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
-      "integrity": "sha1-ucK/WAXx5kqt7tbfOiv6+1pz9aA=",
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@@ -687,7 +687,7 @@
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       "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.26.1.tgz",
-      "integrity": "sha1-GERAjTuPDTWkBOp6wYDwh6YBvZA=",
+      "integrity": "sha512-HyfwY6ApZj7BYTcJURpM5tznulaBvyio7/0d4zFOeMPUmfxkCjHocCuoLa2SAGzBI8AREcH3eP3758F672DppA==",
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@@ -858,7 +858,7 @@
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       "resolved": "https://registry.npmjs.org/babel-loader/-/babel-loader-7.1.4.tgz",
-      "integrity": "sha1-40Y5OL1ObVXRwXTFSF1AahiO0BU=",
+      "integrity": "sha512-/hbyEvPzBJuGpk9o80R0ZyTej6heEOr59GoEUtn8qFKbnx4cJm9FWES6J/iv644sYgrtVw9JJQkjaLW/bqb5gw==",
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@@ -1553,7 +1553,7 @@
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       "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
-      "integrity": "sha1-ry87iPpvXB5MY00aD46sT1WzleM="
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@@ -1571,7 +1571,7 @@
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       "resolved": "https://registry.npmjs.org/base/-/base-0.11.2.tgz",
-      "integrity": "sha1-e95c7RRbbVUakNuH+DxVi060io8=",
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@@ -1630,7 +1630,7 @@
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-      "integrity": "sha1-pfwpi4G54Nyi5FiCR4S2XFK6WI4="
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@@ -1645,7 +1645,7 @@
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-      "integrity": "sha1-s0b27PapX1qBXFg5/HzbIlAvHtc="
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@@ -1701,7 +1701,7 @@
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-      "integrity": "sha1-LN4J617jQfSEdGuwMJsyU7GxRC8="
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@@ -1731,7 +1731,7 @@
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-      "integrity": "sha1-PH/L9SnYcibz0vUrlm/1Jx60Qd0=",
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@@ -1931,7 +1931,7 @@
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-      "integrity": "sha1-Cn9GQWgxyLZi7jb+TnxZ129marI=",
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@@ -2223,7 +2223,7 @@
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       "resolved": "https://registry.npmjs.org/cids/-/cids-0.5.3.tgz",
-      "integrity": "sha1-miW2l+t2+vgHr87DXEq5Nu370KQ=",
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@@ -2233,7 +2233,7 @@
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-      "integrity": "sha1-h2Dk7MJy9MNjUy+SbYdKriwTl94=",
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-      "integrity": "sha1-TzZ0WzIAhJJVf0ZBLWbVDLmbzlE=",
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@@ -2510,7 +2510,7 @@
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@@ -2721,7 +2721,7 @@
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@@ -2895,7 +2895,7 @@
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@@ -3047,7 +3047,7 @@
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@@ -3288,7 +3288,7 @@
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@@ -3619,7 +3619,7 @@
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