1 //===- FuzzerIOPosix.cpp - IO utils for Posix. ----------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 // IO functions implementation using Posix API.
10 //===----------------------------------------------------------------------===//
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
GetSeparator()82 char GetSeparator() {
83 return '/';
84 }
85
OpenFile(int Fd,const char * Mode)86 FILE* OpenFile(int Fd, const char* Mode) {
87 return fdopen(Fd, Mode);
88 }
89
CloseFile(int fd)90 int CloseFile(int fd) {
91 return close(fd);
92 }
93
DuplicateFile(int Fd)94 int DuplicateFile(int Fd) {
95 return dup(Fd);
96 }
97
RemoveFile(const std::string & Path)98 void RemoveFile(const std::string &Path) {
99 unlink(Path.c_str());
100 }
101
DiscardOutput(int Fd)102 void DiscardOutput(int Fd) {
103 FILE* Temp = fopen("/dev/null", "w");
104 if (!Temp)
105 return;
106 dup2(fileno(Temp), Fd);
107 fclose(Temp);
108 }
109
GetHandleFromFd(int fd)110 intptr_t GetHandleFromFd(int fd) {
111 return static_cast<intptr_t>(fd);
112 }
113
DirName(const std::string & FileName)114 std::string DirName(const std::string &FileName) {
115 char *Tmp = new char[FileName.size() + 1];
116 memcpy(Tmp, FileName.c_str(), FileName.size() + 1);
117 std::string Res = dirname(Tmp);
118 delete [] Tmp;
119 return Res;
120 }
121
TmpDir()122 std::string TmpDir() {
123 if (auto Env = getenv("TMPDIR"))
124 return Env;
125 return "/tmp";
126 }
127
IsInterestingCoverageFile(const std::string & FileName)128 bool IsInterestingCoverageFile(const std::string &FileName) {
129 if (FileName.find("compiler-rt/lib/") != std::string::npos)
130 return false; // sanitizer internal.
131 if (FileName.find("/usr/lib/") != std::string::npos)
132 return false;
133 if (FileName.find("/usr/include/") != std::string::npos)
134 return false;
135 if (FileName == "<null>")
136 return false;
137 return true;
138 }
139
140
RawPrint(const char * Str)141 void RawPrint(const char *Str) {
142 write(2, Str, strlen(Str));
143 }
144
145 } // namespace fuzzer
146
147 #endif // LIBFUZZER_POSIX
148