1 //===- FuzzerUtil.cpp - Misc utils ----------------------------------------===//
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 // Misc utils.
10 //===----------------------------------------------------------------------===//
11
12 #include "FuzzerUtil.h"
13 #include "FuzzerIO.h"
14 #include "FuzzerInternal.h"
15 #include <cassert>
16 #include <chrono>
17 #include <cstring>
18 #include <errno.h>
19 #include <signal.h>
20 #include <sstream>
21 #include <stdio.h>
22 #include <sys/types.h>
23 #include <thread>
24
25 namespace fuzzer {
26
PrintHexArray(const uint8_t * Data,size_t Size,const char * PrintAfter)27 void PrintHexArray(const uint8_t *Data, size_t Size,
28 const char *PrintAfter) {
29 for (size_t i = 0; i < Size; i++)
30 Printf("0x%x,", (unsigned)Data[i]);
31 Printf("%s", PrintAfter);
32 }
33
Print(const Unit & v,const char * PrintAfter)34 void Print(const Unit &v, const char *PrintAfter) {
35 PrintHexArray(v.data(), v.size(), PrintAfter);
36 }
37
PrintASCIIByte(uint8_t Byte)38 void PrintASCIIByte(uint8_t Byte) {
39 if (Byte == '\\')
40 Printf("\\\\");
41 else if (Byte == '"')
42 Printf("\\\"");
43 else if (Byte >= 32 && Byte < 127)
44 Printf("%c", Byte);
45 else
46 Printf("\\x%02x", Byte);
47 }
48
PrintASCII(const uint8_t * Data,size_t Size,const char * PrintAfter)49 void PrintASCII(const uint8_t *Data, size_t Size, const char *PrintAfter) {
50 for (size_t i = 0; i < Size; i++)
51 PrintASCIIByte(Data[i]);
52 Printf("%s", PrintAfter);
53 }
54
PrintASCII(const Unit & U,const char * PrintAfter)55 void PrintASCII(const Unit &U, const char *PrintAfter) {
56 PrintASCII(U.data(), U.size(), PrintAfter);
57 }
58
ToASCII(uint8_t * Data,size_t Size)59 bool ToASCII(uint8_t *Data, size_t Size) {
60 bool Changed = false;
61 for (size_t i = 0; i < Size; i++) {
62 uint8_t &X = Data[i];
63 auto NewX = X;
64 NewX &= 127;
65 if (!isspace(NewX) && !isprint(NewX))
66 NewX = ' ';
67 Changed |= NewX != X;
68 X = NewX;
69 }
70 return Changed;
71 }
72
IsASCII(const Unit & U)73 bool IsASCII(const Unit &U) { return IsASCII(U.data(), U.size()); }
74
IsASCII(const uint8_t * Data,size_t Size)75 bool IsASCII(const uint8_t *Data, size_t Size) {
76 for (size_t i = 0; i < Size; i++)
77 if (!(isprint(Data[i]) || isspace(Data[i]))) return false;
78 return true;
79 }
80
ParseOneDictionaryEntry(const std::string & Str,Unit * U)81 bool ParseOneDictionaryEntry(const std::string &Str, Unit *U) {
82 U->clear();
83 if (Str.empty()) return false;
84 size_t L = 0, R = Str.size() - 1; // We are parsing the range [L,R].
85 // Skip spaces from both sides.
86 while (L < R && isspace(Str[L])) L++;
87 while (R > L && isspace(Str[R])) R--;
88 if (R - L < 2) return false;
89 // Check the closing "
90 if (Str[R] != '"') return false;
91 R--;
92 // Find the opening "
93 while (L < R && Str[L] != '"') L++;
94 if (L >= R) return false;
95 assert(Str[L] == '\"');
96 L++;
97 assert(L <= R);
98 for (size_t Pos = L; Pos <= R; Pos++) {
99 uint8_t V = (uint8_t)Str[Pos];
100 if (!isprint(V) && !isspace(V)) return false;
101 if (V =='\\') {
102 // Handle '\\'
103 if (Pos + 1 <= R && (Str[Pos + 1] == '\\' || Str[Pos + 1] == '"')) {
104 U->push_back(Str[Pos + 1]);
105 Pos++;
106 continue;
107 }
108 // Handle '\xAB'
109 if (Pos + 3 <= R && Str[Pos + 1] == 'x'
110 && isxdigit(Str[Pos + 2]) && isxdigit(Str[Pos + 3])) {
111 char Hex[] = "0xAA";
112 Hex[2] = Str[Pos + 2];
113 Hex[3] = Str[Pos + 3];
114 U->push_back(strtol(Hex, nullptr, 16));
115 Pos += 3;
116 continue;
117 }
118 return false; // Invalid escape.
119 } else {
120 // Any other character.
121 U->push_back(V);
122 }
123 }
124 return true;
125 }
126
ParseDictionaryFile(const std::string & Text,std::vector<Unit> * Units)127 bool ParseDictionaryFile(const std::string &Text, std::vector<Unit> *Units) {
128 if (Text.empty()) {
129 Printf("ParseDictionaryFile: file does not exist or is empty\n");
130 return false;
131 }
132 std::istringstream ISS(Text);
133 Units->clear();
134 Unit U;
135 int LineNo = 0;
136 std::string S;
137 while (std::getline(ISS, S, '\n')) {
138 LineNo++;
139 size_t Pos = 0;
140 while (Pos < S.size() && isspace(S[Pos])) Pos++; // Skip spaces.
141 if (Pos == S.size()) continue; // Empty line.
142 if (S[Pos] == '#') continue; // Comment line.
143 if (ParseOneDictionaryEntry(S, &U)) {
144 Units->push_back(U);
145 } else {
146 Printf("ParseDictionaryFile: error in line %d\n\t\t%s\n", LineNo,
147 S.c_str());
148 return false;
149 }
150 }
151 return true;
152 }
153
Base64(const Unit & U)154 std::string Base64(const Unit &U) {
155 static const char Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
156 "abcdefghijklmnopqrstuvwxyz"
157 "0123456789+/";
158 std::string Res;
159 size_t i;
160 for (i = 0; i + 2 < U.size(); i += 3) {
161 uint32_t x = (U[i] << 16) + (U[i + 1] << 8) + U[i + 2];
162 Res += Table[(x >> 18) & 63];
163 Res += Table[(x >> 12) & 63];
164 Res += Table[(x >> 6) & 63];
165 Res += Table[x & 63];
166 }
167 if (i + 1 == U.size()) {
168 uint32_t x = (U[i] << 16);
169 Res += Table[(x >> 18) & 63];
170 Res += Table[(x >> 12) & 63];
171 Res += "==";
172 } else if (i + 2 == U.size()) {
173 uint32_t x = (U[i] << 16) + (U[i + 1] << 8);
174 Res += Table[(x >> 18) & 63];
175 Res += Table[(x >> 12) & 63];
176 Res += Table[(x >> 6) & 63];
177 Res += "=";
178 }
179 return Res;
180 }
181
DescribePC(const char * SymbolizedFMT,uintptr_t PC)182 std::string DescribePC(const char *SymbolizedFMT, uintptr_t PC) {
183 if (!EF->__sanitizer_symbolize_pc) return "<can not symbolize>";
184 char PcDescr[1024];
185 EF->__sanitizer_symbolize_pc(reinterpret_cast<void*>(PC),
186 SymbolizedFMT, PcDescr, sizeof(PcDescr));
187 PcDescr[sizeof(PcDescr) - 1] = 0; // Just in case.
188 return PcDescr;
189 }
190
PrintPC(const char * SymbolizedFMT,const char * FallbackFMT,uintptr_t PC)191 void PrintPC(const char *SymbolizedFMT, const char *FallbackFMT, uintptr_t PC) {
192 if (EF->__sanitizer_symbolize_pc)
193 Printf("%s", DescribePC(SymbolizedFMT, PC).c_str());
194 else
195 Printf(FallbackFMT, PC);
196 }
197
NumberOfCpuCores()198 unsigned NumberOfCpuCores() {
199 unsigned N = std::thread::hardware_concurrency();
200 if (!N) {
201 Printf("WARNING: std::thread::hardware_concurrency not well defined for "
202 "your platform. Assuming CPU count of 1.\n");
203 N = 1;
204 }
205 return N;
206 }
207
ExecuteCommandAndReadOutput(const std::string & Command,std::string * Out)208 bool ExecuteCommandAndReadOutput(const std::string &Command, std::string *Out) {
209 FILE *Pipe = OpenProcessPipe(Command.c_str(), "r");
210 if (!Pipe) return false;
211 char Buff[1024];
212 size_t N;
213 while ((N = fread(Buff, 1, sizeof(Buff), Pipe)) > 0)
214 Out->append(Buff, N);
215 return true;
216 }
217
218 } // namespace fuzzer
219