lib/Fuzzer/FuzzerIOPosix.cpp

   1 //===- FuzzerIOPosix.cpp - IO utils for Posix. ----------------------------===//
   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 implementation using Posix API.
  10 //===----------------------------------------------------------------------===//
  11 #include "FuzzerDefs.h"
  12 #if LIBFUZZER_POSIX
  13
  14 #include "FuzzerExtFunctions.h"
  15 #include "FuzzerIO.h"
  16 #include <cstdarg>
  17 #include <cstdio>
  18 #include <dirent.h>
  19 #include <fstream>
  20 #include <iterator>
  21 #include <libgen.h>
  22 #include <sys/stat.h>
  23 #include <sys/types.h>
  24 #include <unistd.h>
  25
  26 namespace fuzzer {
  27
  28 bool IsFile(const std::string &Path) {
  29   struct stat St;
  30   if (stat(Path.c_str(), &St))
  31     return false;
  32   return S_ISREG(St.st_mode);
  33 }
  34
  35 void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
  36                              std::vector<std::string> *V, bool TopDir) {
  37   auto E = GetEpoch(Dir);
  38   if (Epoch)
  39     if (E && *Epoch >= E) return;
  40
  41   DIR *D = opendir(Dir.c_str());
  42   if (!D) {
  43     Printf("No such directory: %s; exiting\n", Dir.c_str());
  44     exit(1);
  45   }
  46   while (auto E = readdir(D)) {
  47     std::string Path = DirPlusFile(Dir, E->d_name);
  48     if (E->d_type == DT_REG || E->d_type == DT_LNK)
  49       V->push_back(Path);
  50     else if (E->d_type == DT_DIR && *E->d_name != '.')
  51       ListFilesInDirRecursive(Path, Epoch, V, false);
  52   }
  53   closedir(D);
  54   if (Epoch && TopDir)
  55     *Epoch = E;
  56 }
  57
  58 char GetSeparator() {
  59   return '/';
  60 }
  61
  62 FILE* OpenFile(int Fd, const char* Mode) {
  63   return fdopen(Fd, Mode);
  64 }
  65
  66 int CloseFile(int fd) {
  67   return close(fd);
  68 }
  69
  70 int DuplicateFile(int Fd) {
  71   return dup(Fd);
  72 }
  73
  74 void RemoveFile(const std::string &Path) {
  75   unlink(Path.c_str());
  76 }
  77
  78 void DiscardOutput(int Fd) {
  79   FILE* Temp = fopen("/dev/null", "w");
  80   if (!Temp)
  81     return;
  82   dup2(fileno(Temp), Fd);
  83   fclose(Temp);
  84 }
  85
  86 intptr_t GetHandleFromFd(int fd) {
  87   return static_cast<intptr_t>(fd);
  88 }
  89
  90 std::string DirName(const std::string &FileName) {
  91   char *Tmp = new char[FileName.size() + 1];
  92   memcpy(Tmp, FileName.c_str(), FileName.size() + 1);
  93   std::string Res = dirname(Tmp);
  94   delete [] Tmp;
  95   return Res;
  96 }
  97
  98 std::string TmpDir() {
  99   if (auto Env = getenv("TMPDIR"))
 100     return Env;
 101   return "/tmp";
 102 }
 103
 104 bool IsInterestingCoverageFile(const std::string &FileName) {
 105   if (FileName.find("compiler-rt/lib/") != std::string::npos)
 106     return false; // sanitizer internal.
 107   if (FileName.find("/usr/lib/") != std::string::npos)
 108     return false;
 109   if (FileName.find("/usr/include/") != std::string::npos)
 110     return false;
 111   if (FileName == "<null>")
 112     return false;
 113   return true;
 114 }
 115
 116
 117 void RawPrint(const char *Str) {
 118   write(2, Str, strlen(Str));
 119 }
 120
 121 }  // namespace fuzzer
 122
 123 #endif // LIBFUZZER_POSIX