1 //===- FuzzerIOPosix.cpp - IO utils for Posix. ----------------------------===//
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 using Posix API.
9 //===----------------------------------------------------------------------===//
10 #include "FuzzerPlatform.h"
11 #if LIBFUZZER_POSIX || LIBFUZZER_FUCHSIA
12
13 #include "FuzzerExtFunctions.h"
14 #include "FuzzerIO.h"
15 #include <cstdarg>
16 #include <cstdio>
17 #include <dirent.h>
18 #include <fstream>
19 #include <iterator>
20 #include <libgen.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <unistd.h>
24
25 namespace fuzzer {
26
IsFile(const std::string & Path)27 bool IsFile(const std::string &Path) {
28 struct stat St;
29 if (stat(Path.c_str(), &St))
30 return false;
31 return S_ISREG(St.st_mode);
32 }
33
IsDirectory(const std::string & Path)34 bool IsDirectory(const std::string &Path) {
35 struct stat St;
36 if (stat(Path.c_str(), &St))
37 return false;
38 return S_ISDIR(St.st_mode);
39 }
40
FileSize(const std::string & Path)41 size_t FileSize(const std::string &Path) {
42 struct stat St;
43 if (stat(Path.c_str(), &St))
44 return 0;
45 return St.st_size;
46 }
47
Basename(const std::string & Path)48 std::string Basename(const std::string &Path) {
49 size_t Pos = Path.rfind(GetSeparator());
50 if (Pos == std::string::npos) return Path;
51 assert(Pos < Path.size());
52 return Path.substr(Pos + 1);
53 }
54
ListFilesInDirRecursive(const std::string & Dir,long * Epoch,std::vector<std::string> * V,bool TopDir)55 void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
56 std::vector<std::string> *V, bool TopDir) {
57 auto E = GetEpoch(Dir);
58 if (Epoch)
59 if (E && *Epoch >= E) return;
60
61 DIR *D = opendir(Dir.c_str());
62 if (!D) {
63 Printf("%s: %s; exiting\n", strerror(errno), Dir.c_str());
64 exit(1);
65 }
66 while (auto E = readdir(D)) {
67 std::string Path = DirPlusFile(Dir, E->d_name);
68 if (E->d_type == DT_REG || E->d_type == DT_LNK ||
69 (E->d_type == DT_UNKNOWN && IsFile(Path)))
70 V->push_back(Path);
71 else if ((E->d_type == DT_DIR ||
72 (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
73 *E->d_name != '.')
74 ListFilesInDirRecursive(Path, Epoch, V, false);
75 }
76 closedir(D);
77 if (Epoch && TopDir)
78 *Epoch = E;
79 }
80
IterateDirRecursive(const std::string & Dir,void (* DirPreCallback)(const std::string & Dir),void (* DirPostCallback)(const std::string & Dir),void (* FileCallback)(const std::string & Dir))81 void IterateDirRecursive(const std::string &Dir,
82 void (*DirPreCallback)(const std::string &Dir),
83 void (*DirPostCallback)(const std::string &Dir),
84 void (*FileCallback)(const std::string &Dir)) {
85 DirPreCallback(Dir);
86 DIR *D = opendir(Dir.c_str());
87 if (!D) return;
88 while (auto E = readdir(D)) {
89 std::string Path = DirPlusFile(Dir, E->d_name);
90 if (E->d_type == DT_REG || E->d_type == DT_LNK ||
91 (E->d_type == DT_UNKNOWN && IsFile(Path)))
92 FileCallback(Path);
93 else if ((E->d_type == DT_DIR ||
94 (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
95 *E->d_name != '.')
96 IterateDirRecursive(Path, DirPreCallback, DirPostCallback, FileCallback);
97 }
98 closedir(D);
99 DirPostCallback(Dir);
100 }
101
GetSeparator()102 char GetSeparator() {
103 return '/';
104 }
105
IsSeparator(char C)106 bool IsSeparator(char C) {
107 return C == '/';
108 }
109
OpenFile(int Fd,const char * Mode)110 FILE* OpenFile(int Fd, const char* Mode) {
111 return fdopen(Fd, Mode);
112 }
113
CloseFile(int fd)114 int CloseFile(int fd) {
115 return close(fd);
116 }
117
DuplicateFile(int Fd)118 int DuplicateFile(int Fd) {
119 return dup(Fd);
120 }
121
RemoveFile(const std::string & Path)122 void RemoveFile(const std::string &Path) {
123 unlink(Path.c_str());
124 }
125
RenameFile(const std::string & OldPath,const std::string & NewPath)126 void RenameFile(const std::string &OldPath, const std::string &NewPath) {
127 rename(OldPath.c_str(), NewPath.c_str());
128 }
129
GetHandleFromFd(int fd)130 intptr_t GetHandleFromFd(int fd) {
131 return static_cast<intptr_t>(fd);
132 }
133
DirName(const std::string & FileName)134 std::string DirName(const std::string &FileName) {
135 char *Tmp = new char[FileName.size() + 1];
136 memcpy(Tmp, FileName.c_str(), FileName.size() + 1);
137 std::string Res = dirname(Tmp);
138 delete [] Tmp;
139 return Res;
140 }
141
TmpDir()142 std::string TmpDir() {
143 if (auto Env = getenv("TMPDIR"))
144 return Env;
145 return "/tmp";
146 }
147
IsInterestingCoverageFile(const std::string & FileName)148 bool IsInterestingCoverageFile(const std::string &FileName) {
149 if (FileName.find("compiler-rt/lib/") != std::string::npos)
150 return false; // sanitizer internal.
151 if (FileName.find("/usr/lib/") != std::string::npos)
152 return false;
153 if (FileName.find("/usr/include/") != std::string::npos)
154 return false;
155 if (FileName == "<null>")
156 return false;
157 return true;
158 }
159
RawPrint(const char * Str)160 void RawPrint(const char *Str) {
161 (void)write(2, Str, strlen(Str));
162 }
163
MkDir(const std::string & Path)164 void MkDir(const std::string &Path) {
165 mkdir(Path.c_str(), 0700);
166 }
167
RmDir(const std::string & Path)168 void RmDir(const std::string &Path) {
169 rmdir(Path.c_str());
170 }
171
getDevNull()172 const std::string &getDevNull() {
173 static const std::string devNull = "/dev/null";
174 return devNull;
175 }
176
177 } // namespace fuzzer
178
179 #endif // LIBFUZZER_POSIX
180