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//===- FuzzerDriver.cpp - FuzzerDriver function and flags -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// FuzzerDriver and flag parsing.
//===----------------------------------------------------------------------===//
#include "FuzzerInterface.h"
#include "FuzzerInternal.h"
#include <cstring>
#include <unistd.h>
#include <iostream>
#include <thread>
#include <atomic>
#include <mutex>
namespace fuzzer {
// Program arguments.
struct FlagDescription {
const char *Name;
const char *Description;
int Default;
int *Flag;
};
struct {
#define FUZZER_FLAG(Type, Name, Default, Description) Type Name;
#include "FuzzerFlags.def"
#undef FUZZER_FLAG
} Flags;
static FlagDescription FlagDescriptions [] {
#define FUZZER_FLAG(Type, Name, Default, Description) {#Name, Description, Default, &Flags.Name},
#include "FuzzerFlags.def"
#undef FUZZER_FLAG
};
static const size_t kNumFlags =
sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);
static std::vector<std::string> inputs;
static const char *ProgName;
static void PrintHelp() {
std::cerr << "Usage: " << ProgName
<< " [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n";
std::cerr << "\nFlags: (strictly in form -flag=value)\n";
size_t MaxFlagLen = 0;
for (size_t F = 0; F < kNumFlags; F++)
MaxFlagLen = std::max(strlen(FlagDescriptions[F].Name), MaxFlagLen);
for (size_t F = 0; F < kNumFlags; F++) {
const auto &D = FlagDescriptions[F];
std::cerr << " " << D.Name;
for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++)
std::cerr << " ";
std::cerr << "\t";
std::cerr << D.Default << "\t" << D.Description << "\n";
}
}
static const char *FlagValue(const char *Param, const char *Name) {
size_t Len = strlen(Name);
if (Param[0] == '-' && strstr(Param + 1, Name) == Param + 1 &&
Param[Len + 1] == '=')
return &Param[Len + 2];
return nullptr;
}
static bool ParseOneFlag(const char *Param) {
if (Param[0] != '-') return false;
for (size_t F = 0; F < kNumFlags; F++) {
const char *Name = FlagDescriptions[F].Name;
const char *Str = FlagValue(Param, Name);
if (Str) {
int Val = std::stol(Str);
*FlagDescriptions[F].Flag = Val;
if (Flags.verbosity >= 2)
std::cerr << "Flag: " << Name << " " << Val << "\n";
return true;
}
}
PrintHelp();
exit(1);
}
// We don't use any library to minimize dependencies.
static void ParseFlags(int argc, char **argv) {
for (size_t F = 0; F < kNumFlags; F++)
*FlagDescriptions[F].Flag = FlagDescriptions[F].Default;
for (int A = 1; A < argc; A++) {
if (ParseOneFlag(argv[A])) continue;
inputs.push_back(argv[A]);
}
}
static void WorkerThread(const std::string &Cmd, std::atomic<int> *Counter,
int NumJobs, std::atomic<bool> *HasErrors) {
static std::mutex CerrMutex;
while (true) {
int C = (*Counter)++;
if (C >= NumJobs) break;
std::string Log = "fuzz-" + std::to_string(C) + ".log";
std::string ToRun = Cmd + " > " + Log + " 2>&1\n";
if (Flags.verbosity)
std::cerr << ToRun;
int ExitCode = system(ToRun.c_str());
if (ExitCode != 0)
*HasErrors = true;
std::lock_guard<std::mutex> Lock(CerrMutex);
std::cerr << "================== Job " << C
<< " exited with exit code " << ExitCode
<< " =================\n";
fuzzer::CopyFileToErr(Log);
}
}
static int RunInMultipleProcesses(int argc, char **argv, int NumWorkers,
int NumJobs) {
std::atomic<int> Counter(0);
std::atomic<bool> HasErrors(false);
std::string Cmd;
for (int i = 0; i < argc; i++) {
if (FlagValue(argv[i], "jobs") || FlagValue(argv[i], "workers")) continue;
Cmd += argv[i];
Cmd += " ";
}
std::vector<std::thread> V;
for (int i = 0; i < NumWorkers; i++)
V.push_back(std::thread(WorkerThread, Cmd, &Counter, NumJobs, &HasErrors));
for (auto &T : V)
T.join();
return HasErrors ? 1 : 0;
}
int FuzzerDriver(int argc, char **argv, UserCallback Callback) {
using namespace fuzzer;
ProgName = argv[0];
ParseFlags(argc, argv);
if (Flags.help) {
PrintHelp();
return 0;
}
if (Flags.workers > 0 && Flags.jobs > 0)
return RunInMultipleProcesses(argc, argv, Flags.workers, Flags.jobs);
Fuzzer::FuzzingOptions Options;
Options.Verbosity = Flags.verbosity;
Options.MaxLen = Flags.max_len;
Options.DoCrossOver = Flags.cross_over;
Options.MutateDepth = Flags.mutate_depth;
Options.ExitOnFirst = Flags.exit_on_first;
Options.UseCounters = Flags.use_counters;
Options.UseFullCoverageSet = Flags.use_full_coverage_set;
Options.UseCoveragePairs = Flags.use_coverage_pairs;
Options.PreferSmallDuringInitialShuffle =
Flags.prefer_small_during_initial_shuffle;
if (Flags.runs >= 0)
Options.MaxNumberOfRuns = Flags.runs;
if (!inputs.empty())
Options.OutputCorpus = inputs[0];
Fuzzer F(Callback, Options);
unsigned seed = Flags.seed;
// Initialize seed.
if (seed == 0)
seed = time(0) * 10000 + getpid();
if (Flags.verbosity)
std::cerr << "Seed: " << seed << "\n";
srand(seed);
// Timer
if (Flags.timeout > 0)
SetTimer(Flags.timeout);
for (auto &inp : inputs)
F.ReadDir(inp);
if (F.CorpusSize() == 0)
F.AddToCorpus(Unit()); // Can't fuzz empty corpus, so add an empty input.
F.ShuffleAndMinimize();
if (Flags.save_minimized_corpus)
F.SaveCorpus();
F.Loop(Flags.iterations < 0 ? INT_MAX : Flags.iterations);
if (Flags.verbosity)
std::cerr << "Done " << F.getTotalNumberOfRuns()
<< " runs in " << F.secondsSinceProcessStartUp()
<< " seconds\n";
return 0;
}
} // namespace fuzzer
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