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
|
/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "dnsrecords.hh"
#include "rec-protozero.hh"
#include <variant>
void pdns::ProtoZero::RecMessage::addRR(const DNSRecord& record, const std::set<uint16_t>& exportTypes, [[maybe_unused]] std::optional<bool> udr)
{
if (record.d_place != DNSResourceRecord::ANSWER || record.d_class != QClass::IN) {
return;
}
if (exportTypes.count(record.d_type) == 0) {
return;
}
protozero::pbf_writer pbf_rr{d_response, static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::ResponseField::rrs)};
encodeDNSName(pbf_rr, d_rspbuf, static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::name), record.d_name);
pbf_rr.add_uint32(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::type), record.d_type);
pbf_rr.add_uint32(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::class_), record.d_class);
pbf_rr.add_uint32(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::ttl), record.d_ttl);
auto add = [&](const std::string& str) {
if (size() + str.length() < std::numeric_limits<uint16_t>::max() / 2) {
pbf_rr.add_string(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::rdata), str);
}
};
switch (record.d_type) {
case QType::A: {
const auto& content = getRR<ARecordContent>(record);
if (!content) {
return;
}
ComboAddress data = content->getCA();
pbf_rr.add_bytes(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::rdata), reinterpret_cast<const char*>(&data.sin4.sin_addr.s_addr), sizeof(data.sin4.sin_addr.s_addr)); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast): it's the API
break;
}
case QType::AAAA: {
const auto& content = getRR<AAAARecordContent>(record);
if (!content) {
return;
}
ComboAddress data = content->getCA();
pbf_rr.add_bytes(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::rdata), reinterpret_cast<const char*>(&data.sin6.sin6_addr.s6_addr), sizeof(data.sin6.sin6_addr.s6_addr)); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast): it's the API
break;
}
case QType::CNAME: {
const auto& content = getRR<CNAMERecordContent>(record);
if (!content) {
return;
}
add(content->getTarget().toString());
break;
}
case QType::TXT: {
const auto& content = getRR<TXTRecordContent>(record);
if (!content) {
return;
}
add(content->d_text);
break;
}
case QType::NS: {
const auto& content = getRR<NSRecordContent>(record);
if (!content) {
return;
}
add(content->getNS().toString());
break;
}
case QType::PTR: {
const auto& content = getRR<PTRRecordContent>(record);
if (!content) {
return;
}
add(content->getContent().toString());
break;
}
case QType::MX: {
const auto& content = getRR<MXRecordContent>(record);
if (!content) {
return;
}
add(content->d_mxname.toString());
break;
}
case QType::SPF: {
const auto& content = getRR<SPFRecordContent>(record);
if (!content) {
return;
}
add(content->getText());
break;
}
case QType::SRV: {
const auto& content = getRR<SRVRecordContent>(record);
if (!content) {
return;
}
add(content->d_target.toString());
break;
}
case QType::SVCB: {
const auto& content = getRR<SVCBRecordContent>(record);
if (!content) {
return;
}
add(content->getZoneRepresentation());
break;
}
case QType::HTTPS: {
const auto& content = getRR<HTTPSRecordContent>(record);
if (!content) {
return;
}
add(content->getZoneRepresentation());
break;
}
case QType::NAPTR: {
const auto& content = getRR<NAPTRRecordContent>(record);
if (!content) {
return;
}
add(content->getZoneRepresentation());
break;
}
default:
break;
}
#ifdef NOD_ENABLED
if (udr) {
pbf_rr.add_bool(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::udr), *udr);
pbf_rr.commit();
// Save the offset of the byte containing the just added bool. We can do this since
// we know a bit about how protobuf's encoding works.
offsets.push_back(d_rspbuf.length() - 1);
}
#endif
}
#ifdef NOD_ENABLED
void pdns::ProtoZero::RecMessage::clearUDR(std::string& str)
{
for (auto offset : offsets) {
str.at(offset) = 0;
}
}
#endif
void pdns::ProtoZero::RecMessage::addEvents(const RecEventTrace& trace)
{
for (const auto& event : trace.getEvents()) {
protozero::pbf_writer pbf_trace{d_message, static_cast<protozero::pbf_tag_type>(Field::trace)};
pbf_trace.add_int64(static_cast<protozero::pbf_tag_type>(Event::ts), event.d_ts);
pbf_trace.add_uint32(static_cast<protozero::pbf_tag_type>(Event::event), event.d_event);
pbf_trace.add_bool(static_cast<protozero::pbf_tag_type>(Event::start), event.d_start);
const auto& value = event.d_value;
if (std::holds_alternative<std::nullopt_t>(value)) {
}
else if (std::holds_alternative<bool>(value)) {
pbf_trace.add_bool(static_cast<protozero::pbf_tag_type>(Event::boolVal), std::get<bool>(value));
}
else if (std::holds_alternative<int64_t>(value)) {
pbf_trace.add_int64(static_cast<protozero::pbf_tag_type>(Event::intVal), std::get<int64_t>(value));
}
else if (std::holds_alternative<std::string>(value)) {
pbf_trace.add_string(static_cast<protozero::pbf_tag_type>(Event::stringVal), std::get<std::string>(value));
}
else if (std::holds_alternative<PacketBuffer>(value)) {
const auto& packetBuffer = std::get<PacketBuffer>(value);
pbf_trace.add_bytes(static_cast<protozero::pbf_tag_type>(Event::bytesVal), reinterpret_cast<const char*>(packetBuffer.data()), packetBuffer.size()); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast): it's the API
}
if (!event.d_custom.empty()) {
pbf_trace.add_string(static_cast<protozero::pbf_tag_type>(Event::custom), event.d_custom);
}
}
}
|
