xref: /freebsd/contrib/llvm-project/compiler-rt/lib/fuzzer/FuzzerIOWindows.cpp (revision 43a5ec4eb41567cc92586503212743d89686d78f) 
1 //===- FuzzerIOWindows.cpp - IO utils for Windows. ------------------------===//
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-exception
6 //
7 //===----------------------------------------------------------------------===//
8 // IO functions implementation for Windows.
9 //===----------------------------------------------------------------------===//
10 #include "FuzzerPlatform.h"
11 #if LIBFUZZER_WINDOWS
12 
13 #include "FuzzerExtFunctions.h"
14 #include "FuzzerIO.h"
15 #include <cstdarg>
16 #include <cstdio>
17 #include <fstream>
18 #include <io.h>
19 #include <iterator>
20 #include <sys/stat.h>
21 #include <sys/types.h>
22 #include <windows.h>
23 
24 namespace fuzzer {
25 
26 static bool IsFile(const std::string &Path, const DWORD &FileAttributes) {
27 
28   if (FileAttributes & FILE_ATTRIBUTE_NORMAL)
29     return true;
30 
31   if (FileAttributes & FILE_ATTRIBUTE_DIRECTORY)
32     return false;
33 
34   HANDLE FileHandle(
35       CreateFileA(Path.c_str(), 0, FILE_SHARE_READ, NULL, OPEN_EXISTING,
36                   FILE_FLAG_BACKUP_SEMANTICS, 0));
37 
38   if (FileHandle == INVALID_HANDLE_VALUE) {
39     Printf("CreateFileA() failed for \"%s\" (Error code: %lu).\n", Path.c_str(),
40         GetLastError());
41     return false;
42   }
43 
44   DWORD FileType = GetFileType(FileHandle);
45 
46   if (FileType == FILE_TYPE_UNKNOWN) {
47     Printf("GetFileType() failed for \"%s\" (Error code: %lu).\n", Path.c_str(),
48         GetLastError());
49     CloseHandle(FileHandle);
50     return false;
51   }
52 
53   if (FileType != FILE_TYPE_DISK) {
54     CloseHandle(FileHandle);
55     return false;
56   }
57 
58   CloseHandle(FileHandle);
59   return true;
60 }
61 
62 bool IsFile(const std::string &Path) {
63   DWORD Att = GetFileAttributesA(Path.c_str());
64 
65   if (Att == INVALID_FILE_ATTRIBUTES) {
66     Printf("GetFileAttributesA() failed for \"%s\" (Error code: %lu).\n",
67         Path.c_str(), GetLastError());
68     return false;
69   }
70 
71   return IsFile(Path, Att);
72 }
73 
74 static bool IsDir(DWORD FileAttrs) {
75   if (FileAttrs == INVALID_FILE_ATTRIBUTES) return false;
76   return FileAttrs & FILE_ATTRIBUTE_DIRECTORY;
77 }
78 
79 bool IsDirectory(const std::string &Path) {
80   DWORD Att = GetFileAttributesA(Path.c_str());
81 
82   if (Att == INVALID_FILE_ATTRIBUTES) {
83     Printf("GetFileAttributesA() failed for \"%s\" (Error code: %lu).\n",
84            Path.c_str(), GetLastError());
85     return false;
86   }
87 
88   return IsDir(Att);
89 }
90 
91 std::string Basename(const std::string &Path) {
92   size_t Pos = Path.find_last_of("/\\");
93   if (Pos == std::string::npos) return Path;
94   assert(Pos < Path.size());
95   return Path.substr(Pos + 1);
96 }
97 
98 size_t FileSize(const std::string &Path) {
99   WIN32_FILE_ATTRIBUTE_DATA attr;
100   if (!GetFileAttributesExA(Path.c_str(), GetFileExInfoStandard, &attr)) {
101     DWORD LastError = GetLastError();
102     if (LastError != ERROR_FILE_NOT_FOUND)
103       Printf("GetFileAttributesExA() failed for \"%s\" (Error code: %lu).\n",
104              Path.c_str(), LastError);
105     return 0;
106   }
107   ULARGE_INTEGER size;
108   size.HighPart = attr.nFileSizeHigh;
109   size.LowPart = attr.nFileSizeLow;
110   return size.QuadPart;
111 }
112 
113 void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
114                              Vector<std::string> *V, bool TopDir) {
115   auto E = GetEpoch(Dir);
116   if (Epoch)
117     if (E && *Epoch >= E) return;
118 
119   std::string Path(Dir);
120   assert(!Path.empty());
121   if (Path.back() != '\\')
122       Path.push_back('\\');
123   Path.push_back('*');
124 
125   // Get the first directory entry.
126   WIN32_FIND_DATAA FindInfo;
127   HANDLE FindHandle(FindFirstFileA(Path.c_str(), &FindInfo));
128   if (FindHandle == INVALID_HANDLE_VALUE)
129   {
130     if (GetLastError() == ERROR_FILE_NOT_FOUND)
131       return;
132     Printf("No such file or directory: %s; exiting\n", Dir.c_str());
133     exit(1);
134   }
135 
136   do {
137     std::string FileName = DirPlusFile(Dir, FindInfo.cFileName);
138 
139     if (FindInfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
140       size_t FilenameLen = strlen(FindInfo.cFileName);
141       if ((FilenameLen == 1 && FindInfo.cFileName[0] == '.') ||
142           (FilenameLen == 2 && FindInfo.cFileName[0] == '.' &&
143                                FindInfo.cFileName[1] == '.'))
144         continue;
145 
146       ListFilesInDirRecursive(FileName, Epoch, V, false);
147     }
148     else if (IsFile(FileName, FindInfo.dwFileAttributes))
149       V->push_back(FileName);
150   } while (FindNextFileA(FindHandle, &FindInfo));
151 
152   DWORD LastError = GetLastError();
153   if (LastError != ERROR_NO_MORE_FILES)
154     Printf("FindNextFileA failed (Error code: %lu).\n", LastError);
155 
156   FindClose(FindHandle);
157 
158   if (Epoch && TopDir)
159     *Epoch = E;
160 }
161 
162 
163 void IterateDirRecursive(const std::string &Dir,
164                          void (*DirPreCallback)(const std::string &Dir),
165                          void (*DirPostCallback)(const std::string &Dir),
166                          void (*FileCallback)(const std::string &Dir)) {
167   // TODO(metzman): Implement ListFilesInDirRecursive via this function.
168   DirPreCallback(Dir);
169 
170   DWORD DirAttrs = GetFileAttributesA(Dir.c_str());
171   if (!IsDir(DirAttrs)) return;
172 
173   std::string TargetDir(Dir);
174   assert(!TargetDir.empty());
175   if (TargetDir.back() != '\\') TargetDir.push_back('\\');
176   TargetDir.push_back('*');
177 
178   WIN32_FIND_DATAA FindInfo;
179   // Find the directory's first file.
180   HANDLE FindHandle = FindFirstFileA(TargetDir.c_str(), &FindInfo);
181   if (FindHandle == INVALID_HANDLE_VALUE) {
182     DWORD LastError = GetLastError();
183     if (LastError != ERROR_FILE_NOT_FOUND) {
184       // If the directory isn't empty, then something abnormal is going on.
185       Printf("FindFirstFileA failed for %s (Error code: %lu).\n", Dir.c_str(),
186              LastError);
187     }
188     return;
189   }
190 
191   do {
192     std::string Path = DirPlusFile(Dir, FindInfo.cFileName);
193     DWORD PathAttrs = FindInfo.dwFileAttributes;
194     if (IsDir(PathAttrs)) {
195       // Is Path the current directory (".") or the parent ("..")?
196       if (strcmp(FindInfo.cFileName, ".") == 0 ||
197           strcmp(FindInfo.cFileName, "..") == 0)
198         continue;
199       IterateDirRecursive(Path, DirPreCallback, DirPostCallback, FileCallback);
200     } else if (PathAttrs != INVALID_FILE_ATTRIBUTES) {
201       FileCallback(Path);
202     }
203   } while (FindNextFileA(FindHandle, &FindInfo));
204 
205   DWORD LastError = GetLastError();
206   if (LastError != ERROR_NO_MORE_FILES)
207     Printf("FindNextFileA failed for %s (Error code: %lu).\n", Dir.c_str(),
208            LastError);
209 
210   FindClose(FindHandle);
211   DirPostCallback(Dir);
212 }
213 
214 char GetSeparator() {
215   return '\\';
216 }
217 
218 FILE* OpenFile(int Fd, const char* Mode) {
219   return _fdopen(Fd, Mode);
220 }
221 
222 int CloseFile(int Fd) {
223   return _close(Fd);
224 }
225 
226 int DuplicateFile(int Fd) {
227   return _dup(Fd);
228 }
229 
230 void RemoveFile(const std::string &Path) {
231   _unlink(Path.c_str());
232 }
233 
234 void RenameFile(const std::string &OldPath, const std::string &NewPath) {
235   rename(OldPath.c_str(), NewPath.c_str());
236 }
237 
238 intptr_t GetHandleFromFd(int fd) {
239   return _get_osfhandle(fd);
240 }
241 
242 bool IsSeparator(char C) {
243   return C == '\\' || C == '/';
244 }
245 
246 // Parse disk designators, like "C:\". If Relative == true, also accepts: "C:".
247 // Returns number of characters considered if successful.
248 static size_t ParseDrive(const std::string &FileName, const size_t Offset,
249                          bool Relative = true) {
250   if (Offset + 1 >= FileName.size() || FileName[Offset + 1] != ':')
251     return 0;
252   if (Offset + 2 >= FileName.size() || !IsSeparator(FileName[Offset + 2])) {
253     if (!Relative) // Accept relative path?
254       return 0;
255     else
256       return 2;
257   }
258   return 3;
259 }
260 
261 // Parse a file name, like: SomeFile.txt
262 // Returns number of characters considered if successful.
263 static size_t ParseFileName(const std::string &FileName, const size_t Offset) {
264   size_t Pos = Offset;
265   const size_t End = FileName.size();
266   for(; Pos < End && !IsSeparator(FileName[Pos]); ++Pos)
267     ;
268   return Pos - Offset;
269 }
270 
271 // Parse a directory ending in separator, like: `SomeDir\`
272 // Returns number of characters considered if successful.
273 static size_t ParseDir(const std::string &FileName, const size_t Offset) {
274   size_t Pos = Offset;
275   const size_t End = FileName.size();
276   if (Pos >= End || IsSeparator(FileName[Pos]))
277     return 0;
278   for(; Pos < End && !IsSeparator(FileName[Pos]); ++Pos)
279     ;
280   if (Pos >= End)
281     return 0;
282   ++Pos; // Include separator.
283   return Pos - Offset;
284 }
285 
286 // Parse a servername and share, like: `SomeServer\SomeShare\`
287 // Returns number of characters considered if successful.
288 static size_t ParseServerAndShare(const std::string &FileName,
289                                   const size_t Offset) {
290   size_t Pos = Offset, Res;
291   if (!(Res = ParseDir(FileName, Pos)))
292     return 0;
293   Pos += Res;
294   if (!(Res = ParseDir(FileName, Pos)))
295     return 0;
296   Pos += Res;
297   return Pos - Offset;
298 }
299 
300 // Parse the given Ref string from the position Offset, to exactly match the given
301 // string Patt.
302 // Returns number of characters considered if successful.
303 static size_t ParseCustomString(const std::string &Ref, size_t Offset,
304                                 const char *Patt) {
305   size_t Len = strlen(Patt);
306   if (Offset + Len > Ref.size())
307     return 0;
308   return Ref.compare(Offset, Len, Patt) == 0 ? Len : 0;
309 }
310 
311 // Parse a location, like:
312 // \\?\UNC\Server\Share\  \\?\C:\  \\Server\Share\  \  C:\  C:
313 // Returns number of characters considered if successful.
314 static size_t ParseLocation(const std::string &FileName) {
315   size_t Pos = 0, Res;
316 
317   if ((Res = ParseCustomString(FileName, Pos, R"(\\?\)"))) {
318     Pos += Res;
319     if ((Res = ParseCustomString(FileName, Pos, R"(UNC\)"))) {
320       Pos += Res;
321       if ((Res = ParseServerAndShare(FileName, Pos)))
322         return Pos + Res;
323       return 0;
324     }
325     if ((Res = ParseDrive(FileName, Pos, false)))
326       return Pos + Res;
327     return 0;
328   }
329 
330   if (Pos < FileName.size() && IsSeparator(FileName[Pos])) {
331     ++Pos;
332     if (Pos < FileName.size() && IsSeparator(FileName[Pos])) {
333       ++Pos;
334       if ((Res = ParseServerAndShare(FileName, Pos)))
335         return Pos + Res;
336       return 0;
337     }
338     return Pos;
339   }
340 
341   if ((Res = ParseDrive(FileName, Pos)))
342     return Pos + Res;
343 
344   return Pos;
345 }
346 
347 std::string DirName(const std::string &FileName) {
348   size_t LocationLen = ParseLocation(FileName);
349   size_t DirLen = 0, Res;
350   while ((Res = ParseDir(FileName, LocationLen + DirLen)))
351     DirLen += Res;
352   size_t FileLen = ParseFileName(FileName, LocationLen + DirLen);
353 
354   if (LocationLen + DirLen + FileLen != FileName.size()) {
355     Printf("DirName() failed for \"%s\", invalid path.\n", FileName.c_str());
356     exit(1);
357   }
358 
359   if (DirLen) {
360     --DirLen; // Remove trailing separator.
361     if (!FileLen) { // Path ended in separator.
362       assert(DirLen);
363       // Remove file name from Dir.
364       while (DirLen && !IsSeparator(FileName[LocationLen + DirLen - 1]))
365         --DirLen;
366       if (DirLen) // Remove trailing separator.
367         --DirLen;
368     }
369   }
370 
371   if (!LocationLen) { // Relative path.
372     if (!DirLen)
373       return ".";
374     return std::string(".\\").append(FileName, 0, DirLen);
375   }
376 
377   return FileName.substr(0, LocationLen + DirLen);
378 }
379 
380 std::string TmpDir() {
381   std::string Tmp;
382   Tmp.resize(MAX_PATH + 1);
383   DWORD Size = GetTempPathA(Tmp.size(), &Tmp[0]);
384   if (Size == 0) {
385     Printf("Couldn't get Tmp path.\n");
386     exit(1);
387   }
388   Tmp.resize(Size);
389   return Tmp;
390 }
391 
392 bool IsInterestingCoverageFile(const std::string &FileName) {
393   if (FileName.find("Program Files") != std::string::npos)
394     return false;
395   if (FileName.find("compiler-rt\\lib\\") != std::string::npos)
396     return false; // sanitizer internal.
397   if (FileName == "<null>")
398     return false;
399   return true;
400 }
401 
402 void RawPrint(const char *Str) {
403   _write(2, Str, strlen(Str));
404 }
405 
406 void MkDir(const std::string &Path) {
407   if (CreateDirectoryA(Path.c_str(), nullptr)) return;
408   Printf("CreateDirectoryA failed for %s (Error code: %lu).\n", Path.c_str(),
409          GetLastError());
410 }
411 
412 void RmDir(const std::string &Path) {
413   if (RemoveDirectoryA(Path.c_str())) return;
414   Printf("RemoveDirectoryA failed for %s (Error code: %lu).\n", Path.c_str(),
415          GetLastError());
416 }
417 
418 const std::string &getDevNull() {
419   static const std::string devNull = "NUL";
420   return devNull;
421 }
422 
423 }  // namespace fuzzer
424 
425 #endif // LIBFUZZER_WINDOWS
426