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 || LIBFUZZER_FUCHSIA
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 static bool IsDirectory(const std::string &Path) {
36   struct stat St;
37   if (stat(Path.c_str(), &St))
38     return false;
39   return S_ISDIR(St.st_mode);
40 }
41 
42 size_t FileSize(const std::string &Path) {
43   struct stat St;
44   if (stat(Path.c_str(), &St))
45     return 0;
46   return St.st_size;
47 }
48 
49 void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
50                              Vector<std::string> *V, bool TopDir) {
51   auto E = GetEpoch(Dir);
52   if (Epoch)
53     if (E && *Epoch >= E) return;
54 
55   DIR *D = opendir(Dir.c_str());
56   if (!D) {
57     Printf("%s: %s; exiting\n", strerror(errno), Dir.c_str());
58     exit(1);
59   }
60   while (auto E = readdir(D)) {
61     std::string Path = DirPlusFile(Dir, E->d_name);
62     if (E->d_type == DT_REG || E->d_type == DT_LNK ||
63         (E->d_type == DT_UNKNOWN && IsFile(Path)))
64       V->push_back(Path);
65     else if ((E->d_type == DT_DIR ||
66              (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
67              *E->d_name != '.')
68       ListFilesInDirRecursive(Path, Epoch, V, false);
69   }
70   closedir(D);
71   if (Epoch && TopDir)
72     *Epoch = E;
73 }
74 
75 char GetSeparator() {
76   return '/';
77 }
78 
79 FILE* OpenFile(int Fd, const char* Mode) {
80   return fdopen(Fd, Mode);
81 }
82 
83 int CloseFile(int fd) {
84   return close(fd);
85 }
86 
87 int DuplicateFile(int Fd) {
88   return dup(Fd);
89 }
90 
91 void RemoveFile(const std::string &Path) {
92   unlink(Path.c_str());
93 }
94 
95 void DiscardOutput(int Fd) {
96   FILE* Temp = fopen("/dev/null", "w");
97   if (!Temp)
98     return;
99   dup2(fileno(Temp), Fd);
100   fclose(Temp);
101 }
102 
103 intptr_t GetHandleFromFd(int fd) {
104   return static_cast<intptr_t>(fd);
105 }
106 
107 std::string DirName(const std::string &FileName) {
108   char *Tmp = new char[FileName.size() + 1];
109   memcpy(Tmp, FileName.c_str(), FileName.size() + 1);
110   std::string Res = dirname(Tmp);
111   delete [] Tmp;
112   return Res;
113 }
114 
115 std::string TmpDir() {
116   if (auto Env = getenv("TMPDIR"))
117     return Env;
118   return "/tmp";
119 }
120 
121 bool IsInterestingCoverageFile(const std::string &FileName) {
122   if (FileName.find("compiler-rt/lib/") != std::string::npos)
123     return false; // sanitizer internal.
124   if (FileName.find("/usr/lib/") != std::string::npos)
125     return false;
126   if (FileName.find("/usr/include/") != std::string::npos)
127     return false;
128   if (FileName == "<null>")
129     return false;
130   return true;
131 }
132 
133 
134 void RawPrint(const char *Str) {
135   write(2, Str, strlen(Str));
136 }
137 
138 }  // namespace fuzzer
139 
140 #endif // LIBFUZZER_POSIX
141