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103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
//===- FuzzerUtil.cpp - Misc utils ----------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// Misc utils.
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//===----------------------------------------------------------------------===//
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#include "FuzzerInternal.h"
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#include <iostream>
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#include <sys/time.h>
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#include <cassert>
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#include <cstring>
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#include <signal.h>
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#include <unistd.h>
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namespace fuzzer {
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void Print(const Unit &v, const char *PrintAfter) {
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for (auto x : v)
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std::cerr << "0x" << std::hex << (unsigned) x << std::dec << ",";
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std::cerr << PrintAfter;
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}
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void PrintASCII(const Unit &U, const char *PrintAfter) {
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for (auto X : U) {
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if (isprint(X))
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std::cerr << X;
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else
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std::cerr << "\\x" << std::hex << (int)(unsigned)X << std::dec;
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}
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std::cerr << PrintAfter;
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}
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// Try to compute a SHA1 sum of this Unit using an external 'sha1sum' command.
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// We can not use the SHA1 function from openssl directly because
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// a) openssl may not be available,
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// b) we may be fuzzing openssl itself.
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// This is all very sad, suggestions are welcome.
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static std::string TrySha1(const Unit &in) {
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char TempPath[] = "/tmp/fuzzer-tmp-XXXXXX";
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int FD = mkstemp(TempPath);
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if (FD < 0) return "";
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ssize_t Written = write(FD, in.data(), in.size());
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close(FD);
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if (static_cast<size_t>(Written) != in.size()) return "";
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std::string Cmd = "sha1sum < ";
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Cmd += TempPath;
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FILE *F = popen(Cmd.c_str(), "r");
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if (!F) return "";
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char Sha1[41];
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fgets(Sha1, sizeof(Sha1), F);
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fclose(F);
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unlink(TempPath);
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return Sha1;
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}
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std::string Hash(const Unit &in) {
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std::string Sha1 = TrySha1(in);
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if (!Sha1.empty())
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return Sha1;
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size_t h1 = 0, h2 = 0;
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for (auto x : in) {
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h1 += x;
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h1 *= 5;
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h2 += x;
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h2 *= 7;
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}
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return std::to_string(h1) + std::to_string(h2);
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}
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static void AlarmHandler(int, siginfo_t *, void *) {
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Fuzzer::StaticAlarmCallback();
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}
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void SetTimer(int Seconds) {
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struct itimerval T {{Seconds, 0}, {Seconds, 0}};
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std::cerr << "SetTimer " << Seconds << "\n";
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int Res = setitimer(ITIMER_REAL, &T, nullptr);
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assert(Res == 0);
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struct sigaction sigact;
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memset(&sigact, 0, sizeof(sigact));
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sigact.sa_sigaction = AlarmHandler;
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Res = sigaction(SIGALRM, &sigact, 0);
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assert(Res == 0);
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}
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int NumberOfCpuCores() {
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FILE *F = popen("nproc", "r");
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int N = 0;
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fscanf(F, "%d", &N);
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fclose(F);
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return N;
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}
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} // namespace fuzzer
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