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/*
* 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, 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 = dynamic_cast<const ARecordContent&>(*(record.d_content));
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));
break;
}
case QType::AAAA: {
const auto& content = dynamic_cast<const AAAARecordContent&>(*(record.d_content));
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));
break;
}
case QType::CNAME: {
const auto& content = dynamic_cast<const CNAMERecordContent&>(*(record.d_content));
add(content.getTarget().toString());
break;
}
case QType::TXT: {
const auto& content = dynamic_cast<const TXTRecordContent&>(*(record.d_content));
add(content.d_text);
break;
}
case QType::NS: {
const auto& content = dynamic_cast<const NSRecordContent&>(*(record.d_content));
add(content.getNS().toString());
break;
}
case QType::PTR: {
const auto& content = dynamic_cast<const PTRRecordContent&>(*(record.d_content));
add(content.getContent().toString());
break;
}
case QType::MX: {
const auto& content = dynamic_cast<const MXRecordContent&>(*(record.d_content));
add(content.d_mxname.toString());
break;
}
case QType::SPF: {
const auto& content = dynamic_cast<const SPFRecordContent&>(*(record.d_content));
add(content.getText());
break;
}
case QType::SRV: {
const auto& content = dynamic_cast<const SRVRecordContent&>(*(record.d_content));
add(content.d_target.toString());
break;
}
default:
break;
}
#ifdef NOD_ENABLED
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 i : offsets) {
str.at(i) = 0;
}
}
#endif
void pdns::ProtoZero::RecMessage::addEvents(const RecEventTrace& trace)
{
for (const auto& t : 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), t.d_ts);
pbf_trace.add_uint32(static_cast<protozero::pbf_tag_type>(Event::event), t.d_event);
pbf_trace.add_bool(static_cast<protozero::pbf_tag_type>(Event::start), t.d_start);
const auto& v = t.d_value;
if (std::holds_alternative<std::nullopt_t>(v)) {
}
else if (std::holds_alternative<bool>(v)) {
pbf_trace.add_bool(static_cast<protozero::pbf_tag_type>(Event::boolVal), std::get<bool>(v));
}
else if (std::holds_alternative<int64_t>(v)) {
pbf_trace.add_int64(static_cast<protozero::pbf_tag_type>(Event::intVal), std::get<int64_t>(v));
}
else if (std::holds_alternative<std::string>(v)) {
pbf_trace.add_string(static_cast<protozero::pbf_tag_type>(Event::stringVal), std::get<std::string>(v));
}
else if (std::holds_alternative<PacketBuffer>(v)) {
const PacketBuffer& p = std::get<PacketBuffer>(v);
pbf_trace.add_bytes(static_cast<protozero::pbf_tag_type>(Event::bytesVal), reinterpret_cast<const char*>(p.data()), p.size());
}
if (!t.d_custom.empty()) {
pbf_trace.add_string(static_cast<protozero::pbf_tag_type>(Event::custom), t.d_custom);
}
}
}
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