1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <algorithm>
#include <sstream>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/file_util.h"
#include "base/files/file_path.h"
#include "base/json/json_reader.h"
#include "base/memory/scoped_ptr.h"
#include "base/time.h"
#include "base/values.h"
#include "net/base/address_list.h"
#include "net/base/dns_util.h"
#include "net/base/io_buffer.h"
#include "net/base/ip_endpoint.h"
#include "net/dns/dns_protocol.h"
#include "net/dns/dns_query.h"
#include "net/dns/dns_response.h"
namespace {
void CrashDoubleFree(void) {
// Cause ASAN to detect a double-free
void *p = malloc(1);
LOG(INFO) << "Allocated p=" << p << ". Double-freeing...";
free(p);
free(p);
}
void CrashNullPointerDereference(void) {
// Cause the program to segfault with a NULL pointer dereference
int *p = NULL;
*p = 0;
}
bool FitsUint8(int num) {
return (num >= 0) && (num <= kuint8max);
}
bool FitsUint16(int num) {
return (num >= 0) && (num <= kuint16max);
}
bool ReadTestCase(const char* filename,
uint16* id, std::string* qname, uint16* qtype,
std::vector<char>* resp_buf,
bool* crash_test) {
base::FilePath filepath = base::FilePath::FromUTF8Unsafe(filename);
std::string json;
if (!file_util::ReadFileToString(filepath, &json)) {
LOG(ERROR) << filename << ": couldn't read file.";
return false;
}
scoped_ptr<Value> value(base::JSONReader::Read(json));
if (!value.get()) {
LOG(ERROR) << filename << ": couldn't parse JSON.";
return false;
}
DictionaryValue* dict;
if (!value->GetAsDictionary(&dict)) {
LOG(ERROR) << filename << ": test case is not a dictionary.";
return false;
}
*crash_test = dict->HasKey("crash_test");
if (*crash_test) {
LOG(INFO) << filename << ": crash_test is set!";
return true;
}
int id_int;
if (!dict->GetInteger("id", &id_int)) {
LOG(ERROR) << filename << ": id is missing or not an integer.";
return false;
}
if (!FitsUint16(id_int)) {
LOG(ERROR) << filename << ": id is out of range.";
return false;
}
*id = static_cast<uint16>(id_int);
if (!dict->GetStringASCII("qname", qname)) {
LOG(ERROR) << filename << ": qname is missing or not a string.";
return false;
}
int qtype_int;
if (!dict->GetInteger("qtype", &qtype_int)) {
LOG(ERROR) << filename << ": qtype is missing or not an integer.";
return false;
}
if (!FitsUint16(qtype_int)) {
LOG(ERROR) << filename << ": qtype is out of range.";
return false;
}
*qtype = static_cast<uint16>(qtype_int);
ListValue* resp_list;
if (!dict->GetList("response", &resp_list)) {
LOG(ERROR) << filename << ": response is missing or not a list.";
return false;
}
size_t resp_size = resp_list->GetSize();
resp_buf->clear();
resp_buf->reserve(resp_size);
for (size_t i = 0; i < resp_size; i++) {
int resp_byte_int;
if ((!resp_list->GetInteger(i, &resp_byte_int))) {
LOG(ERROR) << filename << ": response[" << i << "] is not an integer.";
return false;
}
if (!FitsUint8(resp_byte_int)) {
LOG(ERROR) << filename << ": response[" << i << "] is out of range.";
return false;
}
resp_buf->push_back(static_cast<char>(resp_byte_int));
}
DCHECK(resp_buf->size() == resp_size);
LOG(INFO) << "Query: id=" << id_int << ", "
<< "qname=" << *qname << ", "
<< "qtype=" << qtype_int << ", "
<< "resp_size=" << resp_size;
return true;
}
void RunTestCase(uint16 id, std::string& qname, uint16 qtype,
std::vector<char>& resp_buf) {
net::DnsQuery query(id, qname, qtype);
net::DnsResponse response;
std::copy(resp_buf.begin(), resp_buf.end(), response.io_buffer()->data());
if (!response.InitParse(resp_buf.size(), query)) {
LOG(INFO) << "InitParse failed.";
return;
}
net::AddressList address_list;
base::TimeDelta ttl;
net::DnsResponse::Result result = response.ParseToAddressList(
&address_list, &ttl);
if (result != net::DnsResponse::DNS_PARSE_OK) {
LOG(INFO) << "ParseToAddressList failed: " << result;
return;
}
// Print the response in one compact line.
std::stringstream result_line;
result_line << "Response: address_list={ ";
for (unsigned int i = 0; i < address_list.size(); i++)
result_line << address_list[i].ToString() << " ";
result_line << "}, ttl=" << ttl.InSeconds() << "s";
LOG(INFO) << result_line.str();
}
bool ReadAndRunTestCase(const char* filename) {
uint16 id = 0;
std::string qname;
uint16 qtype = 0;
std::vector<char> resp_buf;
bool crash_test = false;
LOG(INFO) << "Test case: " << filename;
// ReadTestCase will print a useful error message if it fails.
if (!ReadTestCase(filename, &id, &qname, &qtype, &resp_buf, &crash_test))
return false;
if (crash_test) {
LOG(INFO) << "Crashing.";
CrashDoubleFree();
// if we're not running under ASAN, that might not have worked
CrashNullPointerDereference();
NOTREACHED();
return true;
}
std::string qname_dns;
if (!net::DNSDomainFromDot(qname, &qname_dns)) {
LOG(ERROR) << filename << ": DNSDomainFromDot(" << qname << ") failed.";
return false;
}
RunTestCase(id, qname_dns, qtype, resp_buf);
return true;
}
}
int main(int argc, char** argv) {
int ret = 0;
for (int i = 1; i < argc; i++)
if (!ReadAndRunTestCase(argv[i]))
ret = 2;
// Cluster-Fuzz likes "#EOF" as the last line of output to help distinguish
// successful runs from crashes.
printf("#EOF\n");
return ret;
}
|
