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      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 #include "FuzzerExtFunctions.h"
     12 #include "FuzzerInternal.h"
     13 #include <iterator>
     14 #include <fstream>
     15 #include <dirent.h>
     16 #include <sys/types.h>
     17 #include <sys/stat.h>
     18 #include <unistd.h>
     19 #include <cstdarg>
     20 #include <cstdio>
     21 
     22 namespace fuzzer {
     23 
     24 static FILE *OutputFile = stderr;
     25 
     26 bool IsFile(const std::string &Path) {
     27   struct stat St;
     28   if (stat(Path.c_str(), &St))
     29     return false;
     30   return S_ISREG(St.st_mode);
     31 }
     32 
     33 static long GetEpoch(const std::string &Path) {
     34   struct stat St;
     35   if (stat(Path.c_str(), &St))
     36     return 0;  // Can't stat, be conservative.
     37   return St.st_mtime;
     38 }
     39 
     40 static void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
     41                                     std::vector<std::string> *V, bool TopDir) {
     42   auto E = GetEpoch(Dir);
     43   if (Epoch)
     44     if (E && *Epoch >= E) return;
     45 
     46   DIR *D = opendir(Dir.c_str());
     47   if (!D) {
     48     Printf("No such directory: %s; exiting\n", Dir.c_str());
     49     exit(1);
     50   }
     51   while (auto E = readdir(D)) {
     52     std::string Path = DirPlusFile(Dir, E->d_name);
     53     if (E->d_type == DT_REG || E->d_type == DT_LNK)
     54       V->push_back(Path);
     55     else if (E->d_type == DT_DIR && *E->d_name != '.')
     56       ListFilesInDirRecursive(Path, Epoch, V, false);
     57   }
     58   closedir(D);
     59   if (Epoch && TopDir)
     60     *Epoch = E;
     61 }
     62 
     63 Unit FileToVector(const std::string &Path, size_t MaxSize) {
     64   std::ifstream T(Path);
     65   if (!T) {
     66     Printf("No such directory: %s; exiting\n", Path.c_str());
     67     exit(1);
     68   }
     69 
     70   T.seekg(0, T.end);
     71   size_t FileLen = T.tellg();
     72   if (MaxSize)
     73     FileLen = std::min(FileLen, MaxSize);
     74 
     75   T.seekg(0, T.beg);
     76   Unit Res(FileLen);
     77   T.read(reinterpret_cast<char *>(Res.data()), FileLen);
     78   return Res;
     79 }
     80 
     81 std::string FileToString(const std::string &Path) {
     82   std::ifstream T(Path);
     83   return std::string((std::istreambuf_iterator<char>(T)),
     84                      std::istreambuf_iterator<char>());
     85 }
     86 
     87 void CopyFileToErr(const std::string &Path) {
     88   Printf("%s", FileToString(Path).c_str());
     89 }
     90 
     91 void WriteToFile(const Unit &U, const std::string &Path) {
     92   // Use raw C interface because this function may be called from a sig handler.
     93   FILE *Out = fopen(Path.c_str(), "w");
     94   if (!Out) return;
     95   fwrite(U.data(), sizeof(U[0]), U.size(), Out);
     96   fclose(Out);
     97 }
     98 
     99 void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V,
    100                             long *Epoch, size_t MaxSize) {
    101   long E = Epoch ? *Epoch : 0;
    102   std::vector<std::string> Files;
    103   ListFilesInDirRecursive(Path, Epoch, &Files, /*TopDir*/true);
    104   size_t NumLoaded = 0;
    105   for (size_t i = 0; i < Files.size(); i++) {
    106     auto &X = Files[i];
    107     if (Epoch && GetEpoch(X) < E) continue;
    108     NumLoaded++;
    109     if ((NumLoaded & (NumLoaded - 1)) == 0 && NumLoaded >= 1024)
    110       Printf("Loaded %zd/%zd files from %s\n", NumLoaded, Files.size(), Path);
    111     V->push_back(FileToVector(X, MaxSize));
    112   }
    113 }
    114 
    115 std::string DirPlusFile(const std::string &DirPath,
    116                         const std::string &FileName) {
    117   return DirPath + "/" + FileName;
    118 }
    119 
    120 void DupAndCloseStderr() {
    121   int OutputFd = dup(2);
    122   if (OutputFd > 0) {
    123     FILE *NewOutputFile = fdopen(OutputFd, "w");
    124     if (NewOutputFile) {
    125       OutputFile = NewOutputFile;
    126       if (EF->__sanitizer_set_report_fd)
    127         EF->__sanitizer_set_report_fd(reinterpret_cast<void *>(OutputFd));
    128       close(2);
    129     }
    130   }
    131 }
    132 
    133 void CloseStdout() { close(1); }
    134 
    135 void Printf(const char *Fmt, ...) {
    136   va_list ap;
    137   va_start(ap, Fmt);
    138   vfprintf(OutputFile, Fmt, ap);
    139   va_end(ap);
    140   fflush(OutputFile);
    141 }
    142 
    143 }  // namespace fuzzer
    144