1 //===- FuzzerIO.cpp - IO utils. -------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // IO functions. 10 //===----------------------------------------------------------------------===// 11 12 #include "FuzzerIO.h" 13 #include "FuzzerDefs.h" 14 #include "FuzzerExtFunctions.h" 15 #include <algorithm> 16 #include <cstdarg> 17 #include <fstream> 18 #include <iterator> 19 #include <sys/stat.h> 20 #include <sys/types.h> 21 22 namespace fuzzer { 23 24 static FILE *OutputFile = stderr; 25 26 long GetEpoch(const std::string &Path) { 27 struct stat St; 28 if (stat(Path.c_str(), &St)) 29 return 0; // Can't stat, be conservative. 30 return St.st_mtime; 31 } 32 33 Unit FileToVector(const std::string &Path, size_t MaxSize, bool ExitOnError) { 34 std::ifstream T(Path, std::ios::binary); 35 if (ExitOnError && !T) { 36 Printf("No such directory: %s; exiting\n", Path.c_str()); 37 exit(1); 38 } 39 40 T.seekg(0, T.end); 41 auto EndPos = T.tellg(); 42 if (EndPos < 0) return {}; 43 size_t FileLen = EndPos; 44 if (MaxSize) 45 FileLen = std::min(FileLen, MaxSize); 46 47 T.seekg(0, T.beg); 48 Unit Res(FileLen); 49 T.read(reinterpret_cast<char *>(Res.data()), FileLen); 50 return Res; 51 } 52 53 std::string FileToString(const std::string &Path) { 54 std::ifstream T(Path, std::ios::binary); 55 return std::string((std::istreambuf_iterator<char>(T)), 56 std::istreambuf_iterator<char>()); 57 } 58 59 void CopyFileToErr(const std::string &Path) { 60 Printf("%s", FileToString(Path).c_str()); 61 } 62 63 void WriteToFile(const Unit &U, const std::string &Path) { 64 // Use raw C interface because this function may be called from a sig handler. 65 FILE *Out = fopen(Path.c_str(), "w"); 66 if (!Out) return; 67 fwrite(U.data(), sizeof(U[0]), U.size(), Out); 68 fclose(Out); 69 } 70 71 void ReadDirToVectorOfUnits(const char *Path, Vector<Unit> *V, 72 long *Epoch, size_t MaxSize, bool ExitOnError) { 73 long E = Epoch ? *Epoch : 0; 74 Vector<std::string> Files; 75 ListFilesInDirRecursive(Path, Epoch, &Files, /*TopDir*/true); 76 size_t NumLoaded = 0; 77 for (size_t i = 0; i < Files.size(); i++) { 78 auto &X = Files[i]; 79 if (Epoch && GetEpoch(X) < E) continue; 80 NumLoaded++; 81 if ((NumLoaded & (NumLoaded - 1)) == 0 && NumLoaded >= 1024) 82 Printf("Loaded %zd/%zd files from %s\n", NumLoaded, Files.size(), Path); 83 auto S = FileToVector(X, MaxSize, ExitOnError); 84 if (!S.empty()) 85 V->push_back(S); 86 } 87 } 88 89 90 void GetSizedFilesFromDir(const std::string &Dir, Vector<SizedFile> *V) { 91 Vector<std::string> Files; 92 ListFilesInDirRecursive(Dir, 0, &Files, /*TopDir*/true); 93 for (auto &File : Files) 94 if (size_t Size = FileSize(File)) 95 V->push_back({File, Size}); 96 } 97 98 std::string DirPlusFile(const std::string &DirPath, 99 const std::string &FileName) { 100 return DirPath + GetSeparator() + FileName; 101 } 102 103 void DupAndCloseStderr() { 104 int OutputFd = DuplicateFile(2); 105 if (OutputFd > 0) { 106 FILE *NewOutputFile = OpenFile(OutputFd, "w"); 107 if (NewOutputFile) { 108 OutputFile = NewOutputFile; 109 if (EF->__sanitizer_set_report_fd) 110 EF->__sanitizer_set_report_fd( 111 reinterpret_cast<void *>(GetHandleFromFd(OutputFd))); 112 DiscardOutput(2); 113 } 114 } 115 } 116 117 void CloseStdout() { 118 DiscardOutput(1); 119 } 120 121 void Printf(const char *Fmt, ...) { 122 va_list ap; 123 va_start(ap, Fmt); 124 vfprintf(OutputFile, Fmt, ap); 125 va_end(ap); 126 fflush(OutputFile); 127 } 128 129 } // namespace fuzzer 130