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 "mozilla/Unused.h"
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
IsFile(const std::string & Path)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
IsDirectory(const std::string & Path)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
FileSize(const std::string & Path)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
Basename(const std::string & Path)49 std::string Basename(const std::string &Path) {
50 size_t Pos = Path.rfind(GetSeparator());
51 if (Pos == std::string::npos) return Path;
52 assert(Pos < Path.size());
53 return Path.substr(Pos + 1);
54 }
55
ListFilesInDirRecursive(const std::string & Dir,long * Epoch,Vector<std::string> * V,bool TopDir)56 void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
57 Vector<std::string> *V, bool TopDir) {
58 auto E = GetEpoch(Dir);
59 if (Epoch)
60 if (E && *Epoch >= E) return;
61
62 DIR *D = opendir(Dir.c_str());
63 if (!D) {
64 Printf("%s: %s; exiting\n", strerror(errno), Dir.c_str());
65 exit(1);
66 }
67 while (auto E = readdir(D)) {
68 std::string Path = DirPlusFile(Dir, E->d_name);
69 if (E->d_type == DT_REG || E->d_type == DT_LNK ||
70 (E->d_type == DT_UNKNOWN && IsFile(Path)))
71 V->push_back(Path);
72 else if ((E->d_type == DT_DIR ||
73 (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
74 *E->d_name != '.')
75 ListFilesInDirRecursive(Path, Epoch, V, false);
76 }
77 closedir(D);
78 if (Epoch && TopDir)
79 *Epoch = E;
80 }
81
82
IterateDirRecursive(const std::string & Dir,void (* DirPreCallback)(const std::string & Dir),void (* DirPostCallback)(const std::string & Dir),void (* FileCallback)(const std::string & Dir))83 void IterateDirRecursive(const std::string &Dir,
84 void (*DirPreCallback)(const std::string &Dir),
85 void (*DirPostCallback)(const std::string &Dir),
86 void (*FileCallback)(const std::string &Dir)) {
87 DirPreCallback(Dir);
88 DIR *D = opendir(Dir.c_str());
89 if (!D) return;
90 while (auto E = readdir(D)) {
91 std::string Path = DirPlusFile(Dir, E->d_name);
92 if (E->d_type == DT_REG || E->d_type == DT_LNK ||
93 (E->d_type == DT_UNKNOWN && IsFile(Path)))
94 FileCallback(Path);
95 else if ((E->d_type == DT_DIR ||
96 (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
97 *E->d_name != '.')
98 IterateDirRecursive(Path, DirPreCallback, DirPostCallback, FileCallback);
99 }
100 closedir(D);
101 DirPostCallback(Dir);
102 }
103
GetSeparator()104 char GetSeparator() {
105 return '/';
106 }
107
OpenFile(int Fd,const char * Mode)108 FILE* OpenFile(int Fd, const char* Mode) {
109 return fdopen(Fd, Mode);
110 }
111
CloseFile(int fd)112 int CloseFile(int fd) {
113 return close(fd);
114 }
115
DuplicateFile(int Fd)116 int DuplicateFile(int Fd) {
117 return dup(Fd);
118 }
119
RemoveFile(const std::string & Path)120 void RemoveFile(const std::string &Path) {
121 unlink(Path.c_str());
122 }
123
DiscardOutput(int Fd)124 void DiscardOutput(int Fd) {
125 FILE* Temp = fopen("/dev/null", "w");
126 if (!Temp)
127 return;
128 dup2(fileno(Temp), Fd);
129 fclose(Temp);
130 }
131
GetHandleFromFd(int fd)132 intptr_t GetHandleFromFd(int fd) {
133 return static_cast<intptr_t>(fd);
134 }
135
DirName(const std::string & FileName)136 std::string DirName(const std::string &FileName) {
137 char *Tmp = new char[FileName.size() + 1];
138 memcpy(Tmp, FileName.c_str(), FileName.size() + 1);
139 std::string Res = dirname(Tmp);
140 delete [] Tmp;
141 return Res;
142 }
143
TmpDir()144 std::string TmpDir() {
145 if (auto Env = getenv("TMPDIR"))
146 return Env;
147 return "/tmp";
148 }
149
IsInterestingCoverageFile(const std::string & FileName)150 bool IsInterestingCoverageFile(const std::string &FileName) {
151 if (FileName.find("compiler-rt/lib/") != std::string::npos)
152 return false; // sanitizer internal.
153 if (FileName.find("/usr/lib/") != std::string::npos)
154 return false;
155 if (FileName.find("/usr/include/") != std::string::npos)
156 return false;
157 if (FileName == "<null>")
158 return false;
159 return true;
160 }
161
RawPrint(const char * Str)162 void RawPrint(const char *Str) {
163 mozilla::Unused << write(2, Str, strlen(Str));
164 }
165
MkDir(const std::string & Path)166 void MkDir(const std::string &Path) {
167 mkdir(Path.c_str(), 0700);
168 }
169
RmDir(const std::string & Path)170 void RmDir(const std::string &Path) {
171 rmdir(Path.c_str());
172 }
173
getDevNull()174 const std::string &getDevNull() {
175 static const std::string devNull = "/dev/null";
176 return devNull;
177 }
178
179 } // namespace fuzzer
180
181 #endif // LIBFUZZER_POSIX
182