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
|
#define BOOST_TEST_DYN_LINK
#define BOOST_TEST_NO_MAIN
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <boost/test/unit_test.hpp>
#include <utility>
#include "dnsname.hh"
#include "dnswriter.hh"
#include "ednscookies.hh"
#include "ednsextendederror.hh"
#include "ednsoptions.hh"
#include "ednssubnet.hh"
#include "iputils.hh"
BOOST_AUTO_TEST_SUITE(ednsoptions_cc)
static void getRawQueryWithECSAndCookie(const DNSName& name, const Netmask& ecs, const std::string& clientCookie, const std::string& serverCookie, std::vector<uint8_t>& query)
{
DNSPacketWriter pw(query, name, QType::A, QClass::IN, 0);
pw.commit();
EDNSCookiesOpt cookiesOpt(clientCookie + serverCookie);
string cookiesOptionStr = cookiesOpt.makeOptString();
EDNSSubnetOpts ecsOpts;
ecsOpts.source = ecs;
string origECSOptionStr = makeEDNSSubnetOptsString(ecsOpts);
DNSPacketWriter::optvect_t opts;
opts.emplace_back(EDNSOptionCode::COOKIE, cookiesOptionStr);
opts.emplace_back(EDNSOptionCode::ECS, origECSOptionStr);
opts.emplace_back(EDNSOptionCode::COOKIE, cookiesOptionStr);
pw.addOpt(512, 0, 0, opts);
pw.commit();
}
BOOST_AUTO_TEST_CASE(test_getEDNSOption)
{
DNSName name("www.powerdns.com.");
Netmask ecs("127.0.0.1/32");
vector<uint8_t> query;
getRawQueryWithECSAndCookie(name, ecs, "deadbeef", "deadbeef", query);
const struct dnsheader* dh = reinterpret_cast<struct dnsheader*>(query.data());
size_t questionLen = query.size();
unsigned int consumed = 0;
DNSName dnsname = DNSName(reinterpret_cast<const char*>(query.data()), questionLen, sizeof(dnsheader), false, nullptr, nullptr, &consumed);
size_t pos = sizeof(dnsheader) + consumed + 4;
/* at least OPT root label (1), type (2), class (2) and ttl (4) + OPT RR rdlen (2) = 11 */
BOOST_REQUIRE_EQUAL(ntohs(dh->arcount), 1);
BOOST_REQUIRE(questionLen > pos + 11);
/* OPT root label (1) followed by type (2) */
BOOST_REQUIRE_EQUAL(query.at(pos), 0);
BOOST_REQUIRE(query.at(pos + 2) == QType::OPT);
size_t ecsStartPosition = 0;
size_t ecsLen = 0;
int res = getEDNSOption(reinterpret_cast<const char*>(&query.at(pos + 9)), questionLen - pos - 9, EDNSOptionCode::ECS, &ecsStartPosition, &ecsLen);
BOOST_CHECK_EQUAL(res, 0);
EDNSSubnetOpts eso;
BOOST_REQUIRE(getEDNSSubnetOptsFromString(reinterpret_cast<const char*>(&query.at(pos + 9 + ecsStartPosition + 4)), ecsLen - 4, &eso));
BOOST_CHECK(eso.source == ecs);
}
BOOST_AUTO_TEST_CASE(test_getEDNSOptions)
{
DNSName name("www.powerdns.com.");
Netmask ecs("127.0.0.1/32");
vector<uint8_t> query;
getRawQueryWithECSAndCookie(name, ecs, "deadbeef", "deadbeef", query);
const struct dnsheader* dh = reinterpret_cast<struct dnsheader*>(query.data());
size_t questionLen = query.size();
unsigned int consumed = 0;
DNSName dnsname = DNSName(reinterpret_cast<const char*>(query.data()), questionLen, sizeof(dnsheader), false, nullptr, nullptr, &consumed);
size_t pos = sizeof(dnsheader) + consumed + 4;
/* at least OPT root label (1), type (2), class (2) and ttl (4) + OPT RR rdlen (2) = 11 */
BOOST_REQUIRE_EQUAL(ntohs(dh->arcount), 1);
BOOST_REQUIRE(questionLen > pos + 11);
/* OPT root label (1) followed by type (2) */
BOOST_REQUIRE_EQUAL(query.at(pos), 0);
BOOST_REQUIRE(query.at(pos + 2) == QType::OPT);
EDNSOptionViewMap options;
int res = getEDNSOptions(reinterpret_cast<char*>(query.data()) + pos + 9, questionLen - pos - 9, options);
BOOST_REQUIRE_EQUAL(res, 0);
/* 3 EDNS options but two of them are EDNS Cookie, so we only have two entries in the map */
BOOST_CHECK_EQUAL(options.size(), 2U);
auto it = options.find(EDNSOptionCode::ECS);
BOOST_REQUIRE(it != options.end());
BOOST_REQUIRE_EQUAL(it->second.values.size(), 1U);
BOOST_REQUIRE(it->second.values.at(0).content != nullptr);
BOOST_REQUIRE_GT(it->second.values.at(0).size, 0U);
EDNSSubnetOpts eso;
BOOST_REQUIRE(getEDNSSubnetOptsFromString(it->second.values.at(0).content, it->second.values.at(0).size, &eso));
BOOST_CHECK(eso.source == ecs);
it = options.find(EDNSOptionCode::COOKIE);
BOOST_REQUIRE(it != options.end());
BOOST_REQUIRE_EQUAL(it->second.values.size(), 2U);
BOOST_REQUIRE(it->second.values.at(0).content != nullptr);
BOOST_REQUIRE_GT(it->second.values.at(0).size, 0U);
BOOST_REQUIRE(it->second.values.at(1).content != nullptr);
BOOST_REQUIRE_GT(it->second.values.at(1).size, 0U);
}
static void checkECSOptionValidity(const std::string& sourceStr, uint8_t sourceMask, uint8_t scopeMask)
{
ComboAddress source(sourceStr);
EDNSSubnetOpts ecsOpts;
ecsOpts.source = Netmask(source, sourceMask);
string ecsOptionStr = makeEDNSSubnetOptsString(ecsOpts);
/* 2 bytes for family, one for source mask and one for scope mask */
const size_t ecsHeaderSize = 4;
uint8_t sourceBytes = ((sourceMask - 1) >> 3) + 1;
BOOST_REQUIRE_EQUAL(ecsOptionStr.size(), (ecsHeaderSize + sourceBytes));
/* family */
uint16_t u;
memcpy(&u, ecsOptionStr.c_str(), sizeof(u));
BOOST_REQUIRE_EQUAL(ntohs(u), source.isIPv4() ? 1 : 2);
/* source mask */
BOOST_REQUIRE_EQUAL(static_cast<uint8_t>(ecsOptionStr.at(2)), sourceMask);
BOOST_REQUIRE_EQUAL(static_cast<uint8_t>(ecsOptionStr.at(3)), scopeMask);
ComboAddress truncated(source);
truncated.truncate(sourceMask);
if (sourceMask > 0) {
ComboAddress res;
if (source.isIPv4()) {
memset(&res.sin4, 0, sizeof(res.sin4));
res.sin4.sin_family = AF_INET;
memcpy(&res.sin4.sin_addr.s_addr, &ecsOptionStr.at(4), sourceBytes);
BOOST_REQUIRE(res == truncated);
}
else {
memset(&res.sin6, 0, sizeof(res.sin6));
res.sin6.sin6_family = AF_INET6;
memcpy(&res.sin6.sin6_addr.s6_addr, &ecsOptionStr.at(4), sourceBytes);
BOOST_REQUIRE(res == truncated);
}
}
EDNSSubnetOpts parsed;
BOOST_REQUIRE(getEDNSSubnetOptsFromString(ecsOptionStr, &parsed));
BOOST_REQUIRE(parsed.source == Netmask(truncated, sourceMask));
BOOST_REQUIRE_EQUAL(ecsOpts.scope.getBits(), parsed.scope.getBits());
}
BOOST_AUTO_TEST_CASE(test_makeEDNSSubnetOptsString)
{
checkECSOptionValidity("192.0.2.255", 0, 0);
checkECSOptionValidity("192.0.2.255", 8, 0);
checkECSOptionValidity("255.255.255.255", 9, 0);
checkECSOptionValidity("192.0.2.255", 31, 0);
checkECSOptionValidity("192.0.2.255", 32, 0);
checkECSOptionValidity("2001:DB8::FFFF", 0, 0);
checkECSOptionValidity("2001:DB8::FFFF", 32, 0);
checkECSOptionValidity("2001:DB8::FFFF", 127, 0);
checkECSOptionValidity("2001:DB8::FFFF", 128, 0);
}
static void checkExtendedErrorOptionValidity(EDNSExtendedError::code code, const std::string& extra)
{
EDNSExtendedError eee;
eee.infoCode = static_cast<uint16_t>(code);
eee.extraText = extra;
const auto optionStr = makeEDNSExtendedErrorOptString(eee);
BOOST_REQUIRE_EQUAL(optionStr.size(), sizeof(code) + extra.size());
uint16_t u;
memcpy(&u, optionStr.c_str(), sizeof(u));
BOOST_CHECK_EQUAL(ntohs(u), static_cast<uint16_t>(code));
BOOST_CHECK_EQUAL(optionStr.substr(2), extra);
EDNSExtendedError parsed;
BOOST_REQUIRE(getEDNSExtendedErrorOptFromString(optionStr, parsed));
BOOST_CHECK_EQUAL(parsed.infoCode, static_cast<uint16_t>(code));
BOOST_CHECK_EQUAL(parsed.extraText, extra);
}
BOOST_AUTO_TEST_CASE(test_makeEDNSExtendedErrorOptString)
{
checkExtendedErrorOptionValidity(EDNSExtendedError::code::Other, "");
checkExtendedErrorOptionValidity(static_cast<EDNSExtendedError::code>(255), "");
checkExtendedErrorOptionValidity(EDNSExtendedError::code::UnsupportedDNSKEYAlgorithm, "");
checkExtendedErrorOptionValidity(EDNSExtendedError::code::UnsupportedDSDigestType, "The digest type of this DS is not supported!");
std::string extra;
/* the size of an EDNS option is limited to 2^16-1, and in this case the code already adds 2 bytes */
extra.resize(65534);
BOOST_CHECK_THROW(checkExtendedErrorOptionValidity(EDNSExtendedError::code::Other, extra), std::runtime_error);
EDNSExtendedError parsed;
std::string empty;
BOOST_CHECK(!getEDNSExtendedErrorOptFromString(empty, parsed));
}
BOOST_AUTO_TEST_SUITE_END()
|
