221 lines · cpp
1//===- FuzzerIO.cpp - IO utils. -------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8// IO functions.9//===----------------------------------------------------------------------===//10 11#include "FuzzerDefs.h"12#include "FuzzerExtFunctions.h"13#include "FuzzerIO.h"14#include "FuzzerUtil.h"15#include <algorithm>16#include <cstdarg>17#include <fstream>18#include <iterator>19#include <sys/stat.h>20#include <sys/types.h>21 22namespace fuzzer {23 24static FILE *OutputFile = stderr;25 26FILE *GetOutputFile() {27 return OutputFile;28}29 30void SetOutputFile(FILE *NewOutputFile) {31 OutputFile = NewOutputFile;32}33 34long GetEpoch(const std::string &Path) {35 struct stat St;36 if (stat(Path.c_str(), &St))37 return 0; // Can't stat, be conservative.38 return St.st_mtime;39}40 41Unit FileToVector(const std::string &Path, size_t MaxSize, bool ExitOnError) {42 std::ifstream T(Path, std::ios::binary);43 if (ExitOnError && !T) {44 Printf("No such directory: %s; exiting\n", Path.c_str());45 exit(1);46 }47 48 T.seekg(0, T.end);49 auto EndPos = T.tellg();50 if (EndPos < 0) return {};51 size_t FileLen = EndPos;52 if (MaxSize)53 FileLen = std::min(FileLen, MaxSize);54 55 T.seekg(0, T.beg);56 Unit Res(FileLen);57 T.read(reinterpret_cast<char *>(Res.data()), FileLen);58 return Res;59}60 61std::string FileToString(const std::string &Path) {62 std::ifstream T(Path, std::ios::binary);63 return std::string((std::istreambuf_iterator<char>(T)),64 std::istreambuf_iterator<char>());65}66 67void CopyFileToErr(const std::string &Path) {68 Puts(FileToString(Path).c_str());69}70 71void WriteToFile(const Unit &U, const std::string &Path) {72 WriteToFile(U.data(), U.size(), Path);73}74 75void WriteToFile(const std::string &Data, const std::string &Path) {76 WriteToFile(reinterpret_cast<const uint8_t *>(Data.c_str()), Data.size(),77 Path);78}79 80void WriteToFile(const uint8_t *Data, size_t Size, const std::string &Path) {81 // Use raw C interface because this function may be called from a sig handler.82 FILE *Out = fopen(Path.c_str(), "wb");83 if (!Out) return;84 fwrite(Data, sizeof(Data[0]), Size, Out);85 fclose(Out);86}87 88void AppendToFile(const std::string &Data, const std::string &Path) {89 AppendToFile(reinterpret_cast<const uint8_t *>(Data.data()), Data.size(),90 Path);91}92 93void AppendToFile(const uint8_t *Data, size_t Size, const std::string &Path) {94 FILE *Out = fopen(Path.c_str(), "a");95 if (!Out)96 return;97 fwrite(Data, sizeof(Data[0]), Size, Out);98 fclose(Out);99}100 101void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V, long *Epoch,102 size_t MaxSize, bool ExitOnError,103 std::vector<std::string> *VPaths) {104 long E = Epoch ? *Epoch : 0;105 std::vector<std::string> Files;106 ListFilesInDirRecursive(Path, Epoch, &Files, /*TopDir*/true);107 size_t NumLoaded = 0;108 for (size_t i = 0; i < Files.size(); i++) {109 auto &X = Files[i];110 if (Epoch && GetEpoch(X) < E) continue;111 NumLoaded++;112 if ((NumLoaded & (NumLoaded - 1)) == 0 && NumLoaded >= 1024)113 Printf("Loaded %zd/%zd files from %s\n", NumLoaded, Files.size(), Path);114 auto S = FileToVector(X, MaxSize, ExitOnError);115 if (!S.empty()) {116 V->push_back(S);117 if (VPaths)118 VPaths->push_back(X);119 }120 }121}122 123void GetSizedFilesFromDir(const std::string &Dir, std::vector<SizedFile> *V) {124 std::vector<std::string> Files;125 ListFilesInDirRecursive(Dir, 0, &Files, /*TopDir*/true);126 for (auto &File : Files)127 if (size_t Size = FileSize(File))128 V->push_back({File, Size});129}130 131std::string DirPlusFile(const std::string &DirPath,132 const std::string &FileName) {133 return DirPath + GetSeparator() + FileName;134}135 136void DupAndCloseStderr() {137 int OutputFd = DuplicateFile(2);138 if (OutputFd >= 0) {139 FILE *NewOutputFile = OpenFile(OutputFd, "w");140 if (NewOutputFile) {141 OutputFile = NewOutputFile;142 if (EF->__sanitizer_set_report_fd)143 EF->__sanitizer_set_report_fd(144 reinterpret_cast<void *>(GetHandleFromFd(OutputFd)));145 DiscardOutput(2);146 }147 }148}149 150void CloseStdout() {151 DiscardOutput(1);152}153 154void Puts(const char *Str) {155 fputs(Str, OutputFile);156 fflush(OutputFile);157}158 159void Printf(const char *Fmt, ...) {160 va_list ap;161 va_start(ap, Fmt);162 vfprintf(OutputFile, Fmt, ap);163 va_end(ap);164 fflush(OutputFile);165}166 167void VPrintf(bool Verbose, const char *Fmt, ...) {168 if (!Verbose) return;169 va_list ap;170 va_start(ap, Fmt);171 vfprintf(OutputFile, Fmt, ap);172 va_end(ap);173 fflush(OutputFile);174}175 176static bool MkDirRecursiveInner(const std::string &Leaf) {177 // Prevent chance of potential infinite recursion178 if (Leaf == ".")179 return true;180 181 const std::string &Dir = DirName(Leaf);182 183 if (IsDirectory(Dir)) {184 MkDir(Leaf);185 return IsDirectory(Leaf);186 }187 188 bool ret = MkDirRecursiveInner(Dir);189 if (!ret) {190 // Give up early if a previous MkDir failed191 return ret;192 }193 194 MkDir(Leaf);195 return IsDirectory(Leaf);196}197 198bool MkDirRecursive(const std::string &Dir) {199 if (Dir.empty())200 return false;201 202 if (IsDirectory(Dir))203 return true;204 205 return MkDirRecursiveInner(Dir);206}207 208void RmDirRecursive(const std::string &Dir) {209 IterateDirRecursive(210 Dir, [](const std::string &Path) {},211 [](const std::string &Path) { RmDir(Path); },212 [](const std::string &Path) { RemoveFile(Path); });213}214 215std::string TempPath(const char *Prefix, const char *Extension) {216 return DirPlusFile(TmpDir(), std::string("libFuzzerTemp.") + Prefix +217 std::to_string(GetPid()) + Extension);218}219 220} // namespace fuzzer221