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
25namespace fuzzer {
26
27bool IsFile(const std::string &Path) {
28 struct stat St;
29 if (stat(file: Path.c_str(), buf: &St))
30 return false;
31 return S_ISREG(St.st_mode);
32}
33
34bool IsDirectory(const std::string &Path) {
35 struct stat St;
36 if (stat(file: Path.c_str(), buf: &St))
37 return false;
38 return S_ISDIR(St.st_mode);
39}
40
41size_t FileSize(const std::string &Path) {
42 struct stat St;
43 if (stat(file: Path.c_str(), buf: &St))
44 return 0;
45 return St.st_size;
46}
47
48std::string Basename(const std::string &Path) {
49 size_t Pos = Path.rfind(c: GetSeparator());
50 if (Pos == std::string::npos) return Path;
51 assert(Pos < Path.size());
52 return Path.substr(pos: Pos + 1);
53}
54
55void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
56 std::vector<std::string> *V, bool TopDir) {
57 auto E = GetEpoch(Path: Dir);
58 if (Epoch)
59 if (E && *Epoch >= E) return;
60
61 DIR *D = opendir(name: Dir.c_str());
62 if (!D) {
63 Printf(Fmt: "%s: %s; exiting\n", strerror(errno), Dir.c_str());
64 exit(status: 1);
65 }
66 while (auto E = readdir(dirp: D)) {
67 std::string Path = DirPlusFile(DirPath: Dir, FileName: 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(x: Path);
71 else if ((E->d_type == DT_DIR ||
72 (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
73 *E->d_name != '.')
74 ListFilesInDirRecursive(Dir: Path, Epoch, V, TopDir: false);
75 }
76 closedir(dirp: D);
77 if (Epoch && TopDir)
78 *Epoch = E;
79}
80
81void 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(name: Dir.c_str());
87 if (!D) return;
88 while (auto E = readdir(dirp: D)) {
89 std::string Path = DirPlusFile(DirPath: Dir, FileName: 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(Dir: Path, DirPreCallback, DirPostCallback, FileCallback);
97 }
98 closedir(dirp: D);
99 DirPostCallback(Dir);
100}
101
102char GetSeparator() {
103 return '/';
104}
105
106bool IsSeparator(char C) {
107 return C == '/';
108}
109
110FILE* OpenFile(int Fd, const char* Mode) {
111 return fdopen(fd: Fd, modes: Mode);
112}
113
114int CloseFile(int fd) {
115 return close(fd: fd);
116}
117
118int DuplicateFile(int Fd) {
119 return dup(fd: Fd);
120}
121
122void RemoveFile(const std::string &Path) {
123 unlink(name: Path.c_str());
124}
125
126void RenameFile(const std::string &OldPath, const std::string &NewPath) {
127 rename(old: OldPath.c_str(), new: NewPath.c_str());
128}
129
130intptr_t GetHandleFromFd(int fd) {
131 return static_cast<intptr_t>(fd);
132}
133
134std::string DirName(const std::string &FileName) {
135 char *Tmp = new char[FileName.size() + 1];
136 memcpy(dest: Tmp, src: FileName.c_str(), n: FileName.size() + 1);
137 std::string Res = dirname(path: Tmp);
138 delete [] Tmp;
139 return Res;
140}
141
142std::string TmpDir() {
143 if (auto Env = getenv(name: "TMPDIR"))
144 return Env;
145 return "/tmp";
146}
147
148bool IsInterestingCoverageFile(const std::string &FileName) {
149 if (FileName.find(s: "compiler-rt/lib/") != std::string::npos)
150 return false; // sanitizer internal.
151 if (FileName.find(s: "/usr/lib/") != std::string::npos)
152 return false;
153 if (FileName.find(s: "/usr/include/") != std::string::npos)
154 return false;
155 if (FileName == "<null>")
156 return false;
157 return true;
158}
159
160void RawPrint(const char *Str) {
161 (void)write(fd: 2, buf: Str, n: strlen(s: Str));
162}
163
164void MkDir(const std::string &Path) {
165 mkdir(path: Path.c_str(), mode: 0700);
166}
167
168void RmDir(const std::string &Path) {
169 rmdir(path: Path.c_str());
170}
171
172const 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