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//===- FuzzerInterface.h - Interface header for the Fuzzer ------*- C++ -* ===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Define the interface between the Fuzzer and the library being tested.
//===----------------------------------------------------------------------===//
// WARNING: keep the interface free of STL or any other header-based C++ lib,
// to avoid bad interactions between the code used in the fuzzer and
// the code used in the target function.
#ifndef LLVM_FUZZER_INTERFACE_H
#define LLVM_FUZZER_INTERFACE_H
#include <cstddef>
#include <cstdint>
namespace fuzzer {
typedef void (*UserCallback)(const uint8_t *Data, size_t Size);
/** Simple C-like interface with a single user-supplied callback.
Usage:
#\code
#include "FuzzerInterface.h"
void LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
DoStuffWithData(Data, Size);
}
// Implement your own main() or use the one from FuzzerMain.cpp.
int main(int argc, char **argv) {
InitializeMeIfNeeded();
return fuzzer::FuzzerDriver(argc, argv, LLVMFuzzerTestOneInput);
}
#\endcode
*/
int FuzzerDriver(int argc, char **argv, UserCallback Callback);
/** An abstract class that allows to use user-supplied mutators with libFuzzer.
Usage:
#\code
#include "FuzzerInterface.h"
class MyFuzzer : public fuzzer::UserSuppliedFuzzer {
public:
// Must define the target function.
void TargetFunction(...) { ... }
// Optionally define the mutator.
size_t Mutate(...) { ... }
// Optionally define the CrossOver method.
size_t CrossOver(...) { ... }
};
int main(int argc, char **argv) {
MyFuzzer F;
fuzzer::FuzzerDriver(argc, argv, F);
}
#\endcode
*/
class UserSuppliedFuzzer {
public:
/// Executes the target function on 'Size' bytes of 'Data'.
virtual void TargetFunction(const uint8_t *Data, size_t Size) = 0;
/// Mutates 'Size' bytes of data in 'Data' inplace into up to 'MaxSize' bytes,
/// returns the new size of the data, which should be positive.
virtual size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize) {
return BasicMutate(Data, Size, MaxSize);
}
/// Crosses 'Data1' and 'Data2', writes up to 'MaxOutSize' bytes into Out,
/// returns the number of bytes written, which should be positive.
virtual size_t CrossOver(const uint8_t *Data1, size_t Size1,
const uint8_t *Data2, size_t Size2,
uint8_t *Out, size_t MaxOutSize) {
return BasicCrossOver(Data1, Size1, Data2, Size2, Out, MaxOutSize);
}
virtual ~UserSuppliedFuzzer() {}
protected:
/// These can be called internally by Mutate and CrossOver.
size_t BasicMutate(uint8_t *Data, size_t Size, size_t MaxSize);
size_t BasicCrossOver(const uint8_t *Data1, size_t Size1,
const uint8_t *Data2, size_t Size2,
uint8_t *Out, size_t MaxOutSize);
};
/// Runs the fuzzing with the UserSuppliedFuzzer.
int FuzzerDriver(int argc, char **argv, UserSuppliedFuzzer &USF);
} // namespace fuzzer
#endif // LLVM_FUZZER_INTERFACE_H
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