llvm/lib/Fuzzer/FuzzerIO.cpp

150 lines
4.0 KiB
C++

//===- FuzzerIO.cpp - IO utils. -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// IO functions.
//===----------------------------------------------------------------------===//
#include "FuzzerExtFunctions.h"
#include "FuzzerDefs.h"
#include <iterator>
#include <fstream>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <cstdarg>
#include <cstdio>
namespace fuzzer {
static FILE *OutputFile = stderr;
bool IsFile(const std::string &Path) {
struct stat St;
if (stat(Path.c_str(), &St))
return false;
return S_ISREG(St.st_mode);
}
long GetEpoch(const std::string &Path) {
struct stat St;
if (stat(Path.c_str(), &St))
return 0; // Can't stat, be conservative.
return St.st_mtime;
}
static void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
std::vector<std::string> *V, bool TopDir) {
auto E = GetEpoch(Dir);
if (Epoch)
if (E && *Epoch >= E) return;
DIR *D = opendir(Dir.c_str());
if (!D) {
Printf("No such directory: %s; exiting\n", Dir.c_str());
exit(1);
}
while (auto E = readdir(D)) {
std::string Path = DirPlusFile(Dir, E->d_name);
if (E->d_type == DT_REG || E->d_type == DT_LNK)
V->push_back(Path);
else if (E->d_type == DT_DIR && *E->d_name != '.')
ListFilesInDirRecursive(Path, Epoch, V, false);
}
closedir(D);
if (Epoch && TopDir)
*Epoch = E;
}
Unit FileToVector(const std::string &Path, size_t MaxSize, bool ExitOnError) {
std::ifstream T(Path);
if (ExitOnError && !T) {
Printf("No such directory: %s; exiting\n", Path.c_str());
exit(1);
}
T.seekg(0, T.end);
size_t FileLen = T.tellg();
if (MaxSize)
FileLen = std::min(FileLen, MaxSize);
T.seekg(0, T.beg);
Unit Res(FileLen);
T.read(reinterpret_cast<char *>(Res.data()), FileLen);
return Res;
}
void DeleteFile(const std::string &Path) {
unlink(Path.c_str());
}
std::string FileToString(const std::string &Path) {
std::ifstream T(Path);
return std::string((std::istreambuf_iterator<char>(T)),
std::istreambuf_iterator<char>());
}
void CopyFileToErr(const std::string &Path) {
Printf("%s", FileToString(Path).c_str());
}
void WriteToFile(const Unit &U, const std::string &Path) {
// Use raw C interface because this function may be called from a sig handler.
FILE *Out = fopen(Path.c_str(), "w");
if (!Out) return;
fwrite(U.data(), sizeof(U[0]), U.size(), Out);
fclose(Out);
}
void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V,
long *Epoch, size_t MaxSize, bool ExitOnError) {
long E = Epoch ? *Epoch : 0;
std::vector<std::string> Files;
ListFilesInDirRecursive(Path, Epoch, &Files, /*TopDir*/true);
size_t NumLoaded = 0;
for (size_t i = 0; i < Files.size(); i++) {
auto &X = Files[i];
if (Epoch && GetEpoch(X) < E) continue;
NumLoaded++;
if ((NumLoaded & (NumLoaded - 1)) == 0 && NumLoaded >= 1024)
Printf("Loaded %zd/%zd files from %s\n", NumLoaded, Files.size(), Path);
auto S = FileToVector(X, MaxSize, ExitOnError);
if (!S.empty())
V->push_back(S);
}
}
std::string DirPlusFile(const std::string &DirPath,
const std::string &FileName) {
return DirPath + "/" + FileName;
}
void DupAndCloseStderr() {
int OutputFd = dup(2);
if (OutputFd > 0) {
FILE *NewOutputFile = fdopen(OutputFd, "w");
if (NewOutputFile) {
OutputFile = NewOutputFile;
if (EF->__sanitizer_set_report_fd)
EF->__sanitizer_set_report_fd(reinterpret_cast<void *>(OutputFd));
close(2);
}
}
}
void CloseStdout() { close(1); }
void Printf(const char *Fmt, ...) {
va_list ap;
va_start(ap, Fmt);
vfprintf(OutputFile, Fmt, ap);
va_end(ap);
fflush(OutputFile);
}
} // namespace fuzzer