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[lib/Fuzzer] use sha1sum for the file hash

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237198 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2015-05-12 22:03:34 +00:00
parent c31e732474
commit b8a0c0ecb3
1 changed files with 30 additions and 0 deletions
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30
lib/Fuzzer/FuzzerUtil.cpp
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@ -15,6 +15,7 @@
#include <cassert>
#include <cstring>
#include <signal.h>
#include <unistd.h>
namespace fuzzer {
@ -34,7 +35,36 @@ void PrintASCII(const Unit &U, const char *PrintAfter) {
std::cerr << PrintAfter;
}
// Try to compute a SHA1 sum of this Unit using an external 'sha1sum' command.
// We can not use the SHA1 function from openssl directly because
// a) openssl may not be available,
// b) we may be fuzzing openssl itself.
// This is all very sad, suggestions are welcome.
static std::string TrySha1(const Unit &in) {
char TempPath[] = "/tmp/fuzzer-tmp-XXXXXX";
int FD = mkstemp(TempPath);
if (FD < 0) return "";
ssize_t Written = write(FD, in.data(), in.size());
close(FD);
if (static_cast<size_t>(Written) != in.size()) return "";
std::string Cmd = "sha1sum < ";
Cmd += TempPath;
FILE *F = popen(Cmd.c_str(), "r");
if (!F) return "";
char Sha1[41];
fgets(Sha1, sizeof(Sha1), F);
fclose(F);
unlink(TempPath);
return Sha1;
}
std::string Hash(const Unit &in) {
std::string Sha1 = TrySha1(in);
if (!Sha1.empty())
return Sha1;
size_t h1 = 0, h2 = 0;
for (auto x : in) {
h1 += x;