| //===- 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; |
| |
| FILE *GetOutputFile() { |
| return OutputFile; |
| } |
| |
| void SetOutputFile(FILE *NewOutputFile) { |
| OutputFile = NewOutputFile; |
| } |
| |
| 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, std::vector<Unit> *V, long *Epoch, |
| size_t MaxSize, bool ExitOnError, |
| std::vector<std::string> *VPaths) { |
| 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); |
| if (VPaths) |
| VPaths->push_back(X); |
| } |
| } |
| } |
| |
| void GetSizedFilesFromDir(const std::string &Dir, std::vector<SizedFile> *V) { |
| std::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 |