1 //===- FuzzerInterface.h - Interface header for the Fuzzer ------*- C++ -* ===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // Define the interface between the Fuzzer and the library being tested.
10 //===----------------------------------------------------------------------===//
12 // WARNING: keep the interface free of STL or any other header-based C++ lib,
13 // to avoid bad interactions between the code used in the fuzzer and
14 // the code used in the target function.
16 #ifndef LLVM_FUZZER_INTERFACE_H
17 #define LLVM_FUZZER_INTERFACE_H
24 // Simple C-like interface with a single user-supplied callback.
25 /* Usage: ---------------------------------------------------------------------
26 #include "FuzzerInterface.h"
28 void LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
29 DoStuffWithData(Data, Size);
32 // Implement your own main() or use the one from FuzzerMain.cpp.
33 int main(int argc, char **argv) {
34 InitializeMeIfNeeded();
35 return fuzzer::FuzzerDriver(argc, argv, LLVMFuzzerTestOneInput);
37 ----------------------------------------------------------------------------- */
38 typedef void (*UserCallback)(const uint8_t *Data, size_t Size);
39 int FuzzerDriver(int argc, char **argv, UserCallback Callback);
41 // An abstract class that allows to use user-supplied mutators with libFuzzer.
42 /* Usage: ---------------------------------------------------------------------
43 #include "FuzzerInterface.h"
44 class MyFuzzer : public fuzzer::UserSuppliedFuzzer {
46 // Must define the target function.
47 void TargetFunction(...) { ... }
48 // Optionally define the mutator.
49 size_t Mutate(...) { ... }
50 // Optionally define the CrossOver method.
51 size_t CrossOver(...) { ... }
54 int main(int argc, char **argv) {
56 fuzzer::FuzzerDriver(argc, argv, F);
58 ----------------------------------------------------------------------------- */
59 class UserSuppliedFuzzer {
61 // Executes the target function on 'Size' bytes of 'Data'.
62 virtual void TargetFunction(const uint8_t *Data, size_t Size) = 0;
63 // Mutates 'Size' bytes of data in 'Data' inplace into up to 'MaxSize' bytes,
64 // returns the new size of the data.
65 virtual size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize) {
66 return BasicMutate(Data, Size, MaxSize);
68 // Crosses 'Data1' and 'Data2', writes up to 'MaxOutSize' bytes into Out,
69 // returns the number of bytes written.
70 virtual size_t CrossOver(const uint8_t *Data1, size_t Size1,
71 const uint8_t *Data2, size_t Size2,
72 uint8_t *Out, size_t MaxOutSize) {
73 return BasicCrossOver(Data1, Size1, Data2, Size2, Out, MaxOutSize);
75 virtual ~UserSuppliedFuzzer() {}
78 // These can be called internally by Mutate and CrossOver.
79 size_t BasicMutate(uint8_t *Data, size_t Size, size_t MaxSize);
80 size_t BasicCrossOver(const uint8_t *Data1, size_t Size1,
81 const uint8_t *Data2, size_t Size2,
82 uint8_t *Out, size_t MaxOutSize);
85 int FuzzerDriver(int argc, char **argv, UserSuppliedFuzzer &USF);
89 #endif // LLVM_FUZZER_INTERFACE_H