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 "FuzzerDefs.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 static 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,Vector<std::string> * V,bool TopDir)55 void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
56 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
81
IterateDirRecursive(const std::string & Dir,void (* DirPreCallback)(const std::string & Dir),void (* DirPostCallback)(const std::string & Dir),void (* FileCallback)(const std::string & Dir))82 void IterateDirRecursive(const std::string &Dir,
83 void (*DirPreCallback)(const std::string &Dir),
84 void (*DirPostCallback)(const std::string &Dir),
85 void (*FileCallback)(const std::string &Dir)) {
86 DirPreCallback(Dir);
87 DIR *D = opendir(Dir.c_str());
88 if (!D) return;
89 while (auto E = readdir(D)) {
90 std::string Path = DirPlusFile(Dir, E->d_name);
91 if (E->d_type == DT_REG || E->d_type == DT_LNK ||
92 (E->d_type == DT_UNKNOWN && IsFile(Path)))
93 FileCallback(Path);
94 else if ((E->d_type == DT_DIR ||
95 (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
96 *E->d_name != '.')
97 IterateDirRecursive(Path, DirPreCallback, DirPostCallback, FileCallback);
98 }
99 closedir(D);
100 DirPostCallback(Dir);
101 }
102
GetSeparator()103 char GetSeparator() {
104 return '/';
105 }
106
OpenFile(int Fd,const char * Mode)107 FILE* OpenFile(int Fd, const char* Mode) {
108 return fdopen(Fd, Mode);
109 }
110
CloseFile(int fd)111 int CloseFile(int fd) {
112 return close(fd);
113 }
114
DuplicateFile(int Fd)115 int DuplicateFile(int Fd) {
116 return dup(Fd);
117 }
118
RemoveFile(const std::string & Path)119 void RemoveFile(const std::string &Path) {
120 unlink(Path.c_str());
121 }
122
RenameFile(const std::string & OldPath,const std::string & NewPath)123 void RenameFile(const std::string &OldPath, const std::string &NewPath) {
124 rename(OldPath.c_str(), NewPath.c_str());
125 }
126
DiscardOutput(int Fd)127 void DiscardOutput(int Fd) {
128 FILE* Temp = fopen("/dev/null", "w");
129 if (!Temp)
130 return;
131 dup2(fileno(Temp), Fd);
132 fclose(Temp);
133 }
134
GetHandleFromFd(int fd)135 intptr_t GetHandleFromFd(int fd) {
136 return static_cast<intptr_t>(fd);
137 }
138
DirName(const std::string & FileName)139 std::string DirName(const std::string &FileName) {
140 char *Tmp = new char[FileName.size() + 1];
141 memcpy(Tmp, FileName.c_str(), FileName.size() + 1);
142 std::string Res = dirname(Tmp);
143 delete [] Tmp;
144 return Res;
145 }
146
TmpDir()147 std::string TmpDir() {
148 if (auto Env = getenv("TMPDIR"))
149 return Env;
150 return "/tmp";
151 }
152
IsInterestingCoverageFile(const std::string & FileName)153 bool IsInterestingCoverageFile(const std::string &FileName) {
154 if (FileName.find("compiler-rt/lib/") != std::string::npos)
155 return false; // sanitizer internal.
156 if (FileName.find("/usr/lib/") != std::string::npos)
157 return false;
158 if (FileName.find("/usr/include/") != std::string::npos)
159 return false;
160 if (FileName == "<null>")
161 return false;
162 return true;
163 }
164
RawPrint(const char * Str)165 void RawPrint(const char *Str) {
166 write(2, Str, strlen(Str));
167 }
168
MkDir(const std::string & Path)169 void MkDir(const std::string &Path) {
170 mkdir(Path.c_str(), 0700);
171 }
172
RmDir(const std::string & Path)173 void RmDir(const std::string &Path) {
174 rmdir(Path.c_str());
175 }
176
getDevNull()177 const std::string &getDevNull() {
178 static const std::string devNull = "/dev/null";
179 return devNull;
180 }
181
182 } // namespace fuzzer
183
184 #endif // LIBFUZZER_POSIX
185