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 <cerrno>
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
26namespace fuzzer {
27
28bool IsFile(const std::string &Path) {
29 struct stat St;
30 if (stat(file: Path.c_str(), buf: &St))
31 return false;
32 return S_ISREG(St.st_mode);
33}
34
35bool IsDirectory(const std::string &Path) {
36 struct stat St;
37 if (stat(file: Path.c_str(), buf: &St))
38 return false;
39 return S_ISDIR(St.st_mode);
40}
41
42size_t FileSize(const std::string &Path) {
43 struct stat St;
44 if (stat(file: Path.c_str(), buf: &St))
45 return 0;
46 return St.st_size;
47}
48
49std::string Basename(const std::string &Path) {
50 size_t Pos = Path.rfind(c: GetSeparator());
51 if (Pos == std::string::npos) return Path;
52 assert(Pos < Path.size());
53 return Path.substr(pos: Pos + 1);
54}
55
56void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
57 std::vector<std::string> *V, bool TopDir) {
58 auto E = GetEpoch(Path: Dir);
59 if (Epoch)
60 if (E && *Epoch >= E) return;
61
62 DIR *D = opendir(name: Dir.c_str());
63 if (!D) {
64 Printf(Fmt: "%s: %s; exiting\n", strerror(errno), Dir.c_str());
65 exit(status: 1);
66 }
67 while (auto E = readdir(dirp: D)) {
68 std::string Path = DirPlusFile(DirPath: Dir, FileName: 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(x: Path);
72 else if ((E->d_type == DT_DIR ||
73 (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
74 *E->d_name != '.')
75 ListFilesInDirRecursive(Dir: Path, Epoch, V, TopDir: false);
76 }
77 closedir(dirp: D);
78 if (Epoch && TopDir)
79 *Epoch = E;
80}
81
82void 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(name: Dir.c_str());
88 if (!D) return;
89 while (auto E = readdir(dirp: D)) {
90 std::string Path = DirPlusFile(DirPath: Dir, FileName: 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(Dir: Path, DirPreCallback, DirPostCallback, FileCallback);
98 }
99 closedir(dirp: D);
100 DirPostCallback(Dir);
101}
102
103char GetSeparator() {
104 return '/';
105}
106
107bool IsSeparator(char C) {
108 return C == '/';
109}
110
111FILE* OpenFile(int Fd, const char* Mode) {
112 return fdopen(fd: Fd, modes: Mode);
113}
114
115int CloseFile(int fd) {
116 return close(fd: fd);
117}
118
119int DuplicateFile(int Fd) {
120 return dup(fd: Fd);
121}
122
123void RemoveFile(const std::string &Path) {
124 unlink(name: Path.c_str());
125}
126
127void RenameFile(const std::string &OldPath, const std::string &NewPath) {
128 rename(old: OldPath.c_str(), new: NewPath.c_str());
129}
130
131intptr_t GetHandleFromFd(int fd) {
132 return static_cast<intptr_t>(fd);
133}
134
135std::string DirName(const std::string &FileName) {
136 char *Tmp = new char[FileName.size() + 1];
137 memcpy(dest: Tmp, src: FileName.c_str(), n: FileName.size() + 1);
138 std::string Res = dirname(path: Tmp);
139 delete [] Tmp;
140 return Res;
141}
142
143std::string TmpDir() {
144 if (auto Env = getenv(name: "TMPDIR"))
145 return Env;
146 return "/tmp";
147}
148
149bool IsInterestingCoverageFile(const std::string &FileName) {
150 if (FileName.find(s: "compiler-rt/lib/") != std::string::npos)
151 return false; // sanitizer internal.
152 if (FileName.find(s: "/usr/lib/") != std::string::npos)
153 return false;
154 if (FileName.find(s: "/usr/include/") != std::string::npos)
155 return false;
156 if (FileName == "<null>")
157 return false;
158 return true;
159}
160
161void RawPrint(const char *Str) {
162 (void)write(fd: 2, buf: Str, n: strlen(s: Str));
163}
164
165void MkDir(const std::string &Path) {
166 mkdir(path: Path.c_str(), mode: 0700);
167}
168
169void RmDir(const std::string &Path) {
170 rmdir(path: Path.c_str());
171}
172
173const std::string &getDevNull() {
174 static const std::string devNull = "/dev/null";
175 return devNull;
176}
177
178} // namespace fuzzer
179
180#endif // LIBFUZZER_POSIX
181