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//===- FuzzerIO.cpp - IO utils. -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// IO functions.
//===----------------------------------------------------------------------===//
#include "FuzzerDefs.h"
#include "FuzzerExtFunctions.h"
#include "FuzzerIO.h"
#include "FuzzerUtil.h"
#include <algorithm>
#include <cstdarg>
#include <fstream>
#include <iterator>
#include <sys/stat.h>
#include <sys/types.h>
namespace fuzzer {
static FILE *OutputFile = stderr;
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;
}
Unit FileToVector(const std::string &Path, size_t MaxSize, bool ExitOnError) {
std::ifstream T(Path, std::ios::binary);
if (ExitOnError && !T) {
Printf("No such directory: %s; exiting\n", Path.c_str());
exit(1);
}
T.seekg(0, T.end);
auto EndPos = T.tellg();
if (EndPos < 0) return {};
size_t FileLen = EndPos;
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;
}
std::string FileToString(const std::string &Path) {
std::ifstream T(Path, std::ios::binary);
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) {
WriteToFile(U.data(), U.size(), Path);
}
void WriteToFile(const std::string &Data, const std::string &Path) {
WriteToFile(reinterpret_cast<const uint8_t *>(Data.c_str()), Data.size(),
Path);
}
void WriteToFile(const uint8_t *Data, size_t Size, const std::string &Path) {
// Use raw C interface because this function may be called from a sig handler.
FILE *Out = fopen(Path.c_str(), "wb");
if (!Out) return;
fwrite(Data, sizeof(Data[0]), Size, Out);
fclose(Out);
}
void AppendToFile(const std::string &Data, const std::string &Path) {
AppendToFile(reinterpret_cast<const uint8_t *>(Data.data()), Data.size(),
Path);
}
void AppendToFile(const uint8_t *Data, size_t Size, const std::string &Path) {
FILE *Out = fopen(Path.c_str(), "a");
if (!Out)
return;
fwrite(Data, sizeof(Data[0]), Size, Out);
fclose(Out);
}
void ReadDirToVectorOfUnits(const char *Path, Vector<Unit> *V, long *Epoch,
size_t MaxSize, bool ExitOnError,
Vector<std::string> *VPaths) {
long E = Epoch ? *Epoch : 0;
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);
if (VPaths)
VPaths->push_back(X);
}
}
}
void GetSizedFilesFromDir(const std::string &Dir, Vector<SizedFile> *V) {
Vector<std::string> Files;
ListFilesInDirRecursive(Dir, 0, &Files, /*TopDir*/true);
for (auto &File : Files)
if (size_t Size = FileSize(File))
V->push_back({File, Size});
}
std::string DirPlusFile(const std::string &DirPath,
const std::string &FileName) {
return DirPath + GetSeparator() + FileName;
}
void DupAndCloseStderr() {
int OutputFd = DuplicateFile(2);
if (OutputFd >= 0) {
FILE *NewOutputFile = OpenFile(OutputFd, "w");
if (NewOutputFile) {
OutputFile = NewOutputFile;
if (EF->__sanitizer_set_report_fd)
EF->__sanitizer_set_report_fd(
reinterpret_cast<void *>(GetHandleFromFd(OutputFd)));
DiscardOutput(2);
}
}
}
void CloseStdout() {
DiscardOutput(1);
}
void Printf(const char *Fmt, ...) {
va_list ap;
va_start(ap, Fmt);
vfprintf(OutputFile, Fmt, ap);
va_end(ap);
fflush(OutputFile);
}
void VPrintf(bool Verbose, const char *Fmt, ...) {
if (!Verbose) return;
va_list ap;
va_start(ap, Fmt);
vfprintf(OutputFile, Fmt, ap);
va_end(ap);
fflush(OutputFile);
}
static bool MkDirRecursiveInner(const std::string &Leaf) {
// Prevent chance of potential infinite recursion
if (Leaf == ".")
return true;
const std::string &Dir = DirName(Leaf);
if (IsDirectory(Dir)) {
MkDir(Leaf);
return IsDirectory(Leaf);
}
bool ret = MkDirRecursiveInner(Dir);
if (!ret) {
// Give up early if a previous MkDir failed
return ret;
}
MkDir(Leaf);
return IsDirectory(Leaf);
}
bool MkDirRecursive(const std::string &Dir) {
if (Dir.empty())
return false;
if (IsDirectory(Dir))
return true;
return MkDirRecursiveInner(Dir);
}
void RmDirRecursive(const std::string &Dir) {
IterateDirRecursive(
Dir, [](const std::string &Path) {},
[](const std::string &Path) { RmDir(Path); },
[](const std::string &Path) { RemoveFile(Path); });
}
std::string TempPath(const char *Prefix, const char *Extension) {
return DirPlusFile(TmpDir(), std::string("libFuzzerTemp.") + Prefix +
std::to_string(GetPid()) + Extension);
}
} // namespace fuzzer
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