/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_ipc_Faulty_h
#define mozilla_ipc_Faulty_h

#include <set>
#include <string>
#include <vector>
#include "base/string16.h"
#include "nsDebug.h"
#include "nsTArray.h"
#include "mozilla/UniquePtr.h"

#ifdef IsLoggingEnabled
// This is defined in the Windows SDK urlmon.h
#  undef IsLoggingEnabled
#endif

#define FAULTY_DEFAULT_PROBABILITY 1000
#define FAULTY_DEFAULT_MUTATION_FACTOR 10
#define FAULTY_LOG(fmt, args...)                                  \
  if (mozilla::ipc::Faulty::IsLoggingEnabled()) {                 \
    printf_stderr("[Faulty] (%10u) " fmt "\n", getpid(), ##args); \
  }

namespace IPC {
// Needed for blacklisting messages.
class Message;
class MessageReader;
class MessageWriter;
}  // namespace IPC

namespace mozilla {
namespace ipc {

class Faulty {
 public:
  // Used as a default argument for the Fuzz|datatype| methods.
  static unsigned int DefaultProbability();
  static bool IsLoggingEnabled(void);
  static std::vector<uint8_t> GetDataFromIPCMessage(IPC::Message* aMsg);
  static nsresult CreateOutputDirectory(const char* aPathname);
  static nsresult ReadFile(const char* aPathname, nsTArray<nsCString>& aArray);
  static void CopyFDs(IPC::Message* aDstMsg, IPC::Message* aSrcMsg);

  static Faulty& instance();

  // Fuzzing methods for Pickle.
  void FuzzBool(bool* aValue, unsigned int aProbability = DefaultProbability());
  void FuzzChar(char* aValue, unsigned int aProbability = DefaultProbability());
  void FuzzUChar(unsigned char* aValue,
                 unsigned int aProbability = DefaultProbability());
  void FuzzInt16(int16_t* aValue,
                 unsigned int aProbability = DefaultProbability());
  void FuzzUInt16(uint16_t* aValue,
                  unsigned int aProbability = DefaultProbability());
  void FuzzInt(int* aValue, unsigned int aProbability = DefaultProbability());
  void FuzzUInt32(uint32_t* aValue,
                  unsigned int aProbability = DefaultProbability());
  void FuzzLong(long* aValue, unsigned int aProbability = DefaultProbability());
  void FuzzULong(unsigned long* aValue,
                 unsigned int aProbability = DefaultProbability());
  void FuzzInt64(int64_t* aValue,
                 unsigned int aProbability = DefaultProbability());
  void FuzzUInt64(uint64_t* aValue,
                  unsigned int aProbability = DefaultProbability());
  void FuzzFloat(float* aValue,
                 unsigned int aProbability = DefaultProbability());
  void FuzzDouble(double* aValue,
                  unsigned int aProbability = DefaultProbability());
  void FuzzString(std::string& aValue,
                  unsigned int aProbability = DefaultProbability());
  void FuzzWString(std::wstring& aValue,
                   unsigned int aProbability = DefaultProbability());
  void FuzzBytes(void* aData, int aLength,
                 unsigned int aProbability = DefaultProbability());

  // Fuzzing methods for pipe fuzzing.
  void MaybeCollectAndClosePipe(
      int aPipe, unsigned int aProbability = DefaultProbability());

  // Fuzzing methods for message blob fuzzing.
  void DumpMessage(const char* aChannel, IPC::Message* aMsg,
                   std::string aAppendix = nullptr);
  bool IsMessageNameBlacklisted(const char* aMessageName);
  UniquePtr<IPC::Message> MutateIPCMessage(
      const char* aChannel, UniquePtr<IPC::Message> aMsg,
      unsigned int aProbability = DefaultProbability());

  void LogMessage(const char* aChannel, IPC::Message* aMsg);

 private:
  std::set<int> mFds;

  const bool mFuzzMessages;
  const bool mFuzzPipes;
  const bool mFuzzPickle;
  const bool mUseLargeValues;
  const bool mUseAsWhitelist;
  const bool mIsValidProcessType;

  const char* mMessagePath;
  const char* mBlacklistPath;

  size_t sMsgCounter;

  Faulty();
  DISALLOW_EVIL_CONSTRUCTORS(Faulty);

  static bool IsValidProcessType(void);
  static uint32_t MutationFactor();

  // Fuzzing methods for Pickle
  void MutateBool(bool* aValue);
  void MutateChar(char* aValue);
  void MutateUChar(unsigned char* aValue);
  void MutateInt16(int16_t* aValue);
  void MutateUInt16(uint16_t* aValue);
  void MutateInt(int* aValue);
  void MutateUInt32(uint32_t* aValue);
  void MutateLong(long* aValue);
  void MutateULong(unsigned long* aValue);
  void MutateInt64(int64_t* aValue);
  void MutateUInt64(uint64_t* aValue);
  void MutateFloat(float* aValue);
  void MutateDouble(double* aValue);
};

}  // namespace ipc
}  // namespace mozilla

#endif