/
test-dnsdist_cc.cc
2377 lines (2017 loc) · 93.8 KB
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test-dnsdist_cc.cc
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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.
*/
#ifndef BOOST_TEST_DYN_LINK
#define BOOST_TEST_DYN_LINK
#endif
#define BOOST_TEST_NO_MAIN
#include <boost/test/unit_test.hpp>
#include <unistd.h>
#include "dnsdist.hh"
#include "dnsdist-ecs.hh"
#include "dnsdist-internal-queries.hh"
#include "dnsdist-tcp.hh"
#include "dnsdist-xpf.hh"
#include "dnsdist-xsk.hh"
#include "dolog.hh"
#include "dnsname.hh"
#include "dnsparser.hh"
#include "dnswriter.hh"
#include "ednsoptions.hh"
#include "ednscookies.hh"
#include "ednssubnet.hh"
ProcessQueryResult processQueryAfterRules(DNSQuestion& dnsQuestion, LocalHolders& holders, std::shared_ptr<DownstreamState>& selectedBackend)
{
return ProcessQueryResult::Drop;
}
bool processResponseAfterRules(PacketBuffer& response, const std::vector<dnsdist::rules::ResponseRuleAction>& cacheInsertedRespRuleActions, DNSResponse& dnsResponse, bool muted)
{
return false;
}
bool applyRulesToResponse(const std::vector<dnsdist::rules::ResponseRuleAction>& respRuleActions, DNSResponse& dnsResponse)
{
return true;
}
bool sendUDPResponse(int origFD, const PacketBuffer& response, const int delayMsec, const ComboAddress& origDest, const ComboAddress& origRemote)
{
return false;
}
bool assignOutgoingUDPQueryToBackend(std::shared_ptr<DownstreamState>& downstream, uint16_t queryID, DNSQuestion& dnsQuestion, PacketBuffer& query, bool actuallySend)
{
return true;
}
namespace dnsdist
{
std::unique_ptr<CrossProtocolQuery> getInternalQueryFromDQ(DNSQuestion& dnsQuestion, bool isResponse)
{
return nullptr;
}
}
// NOLINTNEXTLINE(readability-convert-member-functions-to-static): only a stub
bool DNSDistSNMPAgent::sendBackendStatusChangeTrap([[maybe_unused]] DownstreamState const& backend)
{
return false;
}
namespace dnsdist::xsk
{
bool XskProcessQuery(ClientState& clientState, LocalHolders& holders, XskPacket& packet)
{
return false;
}
}
bool processResponderPacket(std::shared_ptr<DownstreamState>& dss, PacketBuffer& response, const std::vector<dnsdist::rules::ResponseRuleAction>& localRespRuleActions, const std::vector<dnsdist::rules::ResponseRuleAction>& cacheInsertedRespRuleActions, InternalQueryState&& ids)
{
return false;
}
BOOST_AUTO_TEST_SUITE(test_dnsdist_cc)
static const uint16_t ECSSourcePrefixV4 = 24;
static const uint16_t ECSSourcePrefixV6 = 56;
static void validateQuery(const PacketBuffer& packet, bool hasEdns = true, bool hasXPF = false, uint16_t additionals = 0, uint16_t answers = 0, uint16_t authorities = 0)
{
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
MOADNSParser mdp(true, reinterpret_cast<const char*>(packet.data()), packet.size());
BOOST_CHECK_EQUAL(mdp.d_qname.toString(), "www.powerdns.com.");
BOOST_CHECK_EQUAL(mdp.d_header.qdcount, 1U);
BOOST_CHECK_EQUAL(mdp.d_header.ancount, answers);
BOOST_CHECK_EQUAL(mdp.d_header.nscount, authorities);
uint16_t expectedARCount = additionals + (hasEdns ? 1U : 0U) + (hasXPF ? 1U : 0U);
BOOST_CHECK_EQUAL(mdp.d_header.arcount, expectedARCount);
}
static void validateECS(const PacketBuffer& packet, const ComboAddress& expected)
{
InternalQueryState ids;
ids.protocol = dnsdist::Protocol::DoUDP;
ids.origRemote = ComboAddress("::1");
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
ids.qname = DNSName(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &ids.qtype, &ids.qclass);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
DNSQuestion dnsQuestion(ids, const_cast<PacketBuffer&>(packet));
BOOST_CHECK(parseEDNSOptions(dnsQuestion));
BOOST_REQUIRE(dnsQuestion.ednsOptions != nullptr);
BOOST_CHECK_EQUAL(dnsQuestion.ednsOptions->size(), 1U);
const auto& ecsOption = dnsQuestion.ednsOptions->find(EDNSOptionCode::ECS);
BOOST_REQUIRE(ecsOption != dnsQuestion.ednsOptions->cend());
string expectedOption;
generateECSOption(expected, expectedOption, expected.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
/* we need to skip the option code and length, which are not included */
BOOST_REQUIRE_EQUAL(ecsOption->second.values.size(), 1U);
BOOST_CHECK_EQUAL(expectedOption.substr(EDNS_OPTION_CODE_SIZE + EDNS_OPTION_LENGTH_SIZE), std::string(ecsOption->second.values.at(0).content, ecsOption->second.values.at(0).size));
}
static void validateResponse(const PacketBuffer& packet, bool hasEdns, uint8_t additionalCount = 0)
{
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
MOADNSParser mdp(false, reinterpret_cast<const char*>(packet.data()), packet.size());
BOOST_CHECK_EQUAL(mdp.d_qname.toString(), "www.powerdns.com.");
BOOST_CHECK_EQUAL(mdp.d_header.qr, 1U);
BOOST_CHECK_EQUAL(mdp.d_header.qdcount, 1U);
BOOST_CHECK_EQUAL(mdp.d_header.ancount, 1U);
BOOST_CHECK_EQUAL(mdp.d_header.nscount, 0U);
BOOST_CHECK_EQUAL(mdp.d_header.arcount, (hasEdns ? 1U : 0U) + additionalCount);
}
BOOST_AUTO_TEST_CASE(test_addXPF)
{
static const uint16_t xpfOptionCode = 65422;
DNSName name("www.powerdns.com.");
InternalQueryState ids;
ids.protocol = dnsdist::Protocol::DoUDP;
ids.origRemote = ComboAddress("::1");
ids.origDest = ComboAddress("::1");
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
PacketBuffer queryWithXPF;
{
PacketBuffer packet = query;
/* large enough packet */
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
ids.qname = DNSName(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &ids.qtype, &ids.qclass);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
DNSQuestion dnsQuestion(ids, const_cast<PacketBuffer&>(packet));
BOOST_CHECK_EQUAL(ids.qname, name);
BOOST_CHECK(ids.qtype == QType::A);
BOOST_CHECK(addXPF(dnsQuestion, xpfOptionCode));
BOOST_CHECK(packet.size() > query.size());
validateQuery(packet, false, true);
queryWithXPF = packet;
}
{
PacketBuffer packet = query;
/* packet is already too large for the 4096 limit over UDP */
packet.resize(4096);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
ids.qname = DNSName(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &ids.qtype, &ids.qclass);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
DNSQuestion dnsQuestion(ids, const_cast<PacketBuffer&>(packet));
BOOST_CHECK_EQUAL(ids.qname, name);
BOOST_CHECK(ids.qtype == QType::A);
BOOST_REQUIRE(!addXPF(dnsQuestion, xpfOptionCode));
BOOST_CHECK_EQUAL(packet.size(), 4096U);
packet.resize(query.size());
validateQuery(packet, false, false);
}
{
PacketBuffer packet = query;
/* packet with trailing data (overriding it) */
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
ids.qname = DNSName(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &ids.qtype, &ids.qclass);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
DNSQuestion dnsQuestion(ids, const_cast<PacketBuffer&>(packet));
BOOST_CHECK_EQUAL(ids.qname, name);
BOOST_CHECK(ids.qtype == QType::A);
/* add trailing data */
const size_t trailingDataSize = 10;
/* Making sure we have enough room to allow for fake trailing data */
packet.resize(packet.size() + trailingDataSize);
for (size_t idx = 0; idx < trailingDataSize; idx++) {
packet.push_back('A');
}
BOOST_CHECK(addXPF(dnsQuestion, xpfOptionCode));
BOOST_CHECK_EQUAL(packet.size(), queryWithXPF.size());
BOOST_CHECK_EQUAL(memcmp(queryWithXPF.data(), packet.data(), queryWithXPF.size()), 0);
validateQuery(packet, false, true);
}
}
BOOST_AUTO_TEST_CASE(addECSWithoutEDNS)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.0.2.1");
DNSName name("www.powerdns.com.");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
uint16_t len = query.size();
/* large enough packet */
PacketBuffer packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, false, newECSOption));
BOOST_CHECK(packet.size() > query.size());
BOOST_CHECK_EQUAL(ednsAdded, true);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet);
validateECS(packet, remote);
PacketBuffer queryWithEDNS = packet;
/* not large enough packet */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(!handleEDNSClientSubnet(packet, packet.size(), consumed, ednsAdded, ecsAdded, false, newECSOption));
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
packet.resize(query.size());
validateQuery(packet, false);
/* packet with trailing data (overriding it) */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
/* add trailing data */
const size_t trailingDataSize = 10;
/* Making sure we have enough room to allow for fake trailing data */
packet.resize(packet.size() + trailingDataSize);
for (size_t idx = 0; idx < trailingDataSize; idx++) {
packet[len + idx] = 'A';
}
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, false, newECSOption));
BOOST_REQUIRE_EQUAL(packet.size(), queryWithEDNS.size());
BOOST_CHECK_EQUAL(memcmp(queryWithEDNS.data(), packet.data(), queryWithEDNS.size()), 0);
BOOST_CHECK_EQUAL(ednsAdded, true);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet);
}
BOOST_AUTO_TEST_CASE(addECSWithoutEDNSButWithAnswer)
{
/* this might happen for NOTIFY queries where, according to rfc1996:
"If ANCOUNT>0, then the answer section represents an
unsecure hint at the new RRset for this <QNAME,QCLASS,QTYPE>".
*/
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.0.2.1");
DNSName name("www.powerdns.com.");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
packetWriter.startRecord(name, QType::A, 60, QClass::IN, DNSResourceRecord::ANSWER, false);
packetWriter.xfrIP(remote.sin4.sin_addr.s_addr);
packetWriter.commit();
uint16_t len = query.size();
/* large enough packet */
PacketBuffer packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, false, newECSOption));
BOOST_CHECK(packet.size() > query.size());
BOOST_CHECK_EQUAL(ednsAdded, true);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet, true, false, 0, 1);
validateECS(packet, remote);
PacketBuffer queryWithEDNS = packet;
/* not large enough packet */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(!handleEDNSClientSubnet(packet, packet.size(), consumed, ednsAdded, ecsAdded, false, newECSOption));
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
packet.resize(query.size());
validateQuery(packet, false, false, 0, 1);
/* packet with trailing data (overriding it) */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
/* add trailing data */
const size_t trailingDataSize = 10;
/* Making sure we have enough room to allow for fake trailing data */
packet.resize(packet.size() + trailingDataSize);
for (size_t idx = 0; idx < trailingDataSize; idx++) {
packet[len + idx] = 'A';
}
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, false, newECSOption));
BOOST_REQUIRE_EQUAL(packet.size(), queryWithEDNS.size());
BOOST_CHECK_EQUAL(memcmp(queryWithEDNS.data(), packet.data(), queryWithEDNS.size()), 0);
BOOST_CHECK_EQUAL(ednsAdded, true);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet, true, false, 0, 1);
}
BOOST_AUTO_TEST_CASE(addECSWithoutEDNSAlreadyParsed)
{
InternalQueryState ids;
ids.origRemote = ComboAddress("192.0.2.1");
ids.protocol = dnsdist::Protocol::DoUDP;
bool ednsAdded = false;
bool ecsAdded = false;
DNSName name("www.powerdns.com.");
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
auto packet = query;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
ids.qname = DNSName(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &ids.qtype, &ids.qclass);
BOOST_CHECK_EQUAL(ids.qname, name);
BOOST_CHECK(ids.qtype == QType::A);
BOOST_CHECK(ids.qclass == QClass::IN);
DNSQuestion dnsQuestion(ids, packet);
/* Parse the options before handling ECS, simulating a Lua rule asking for EDNS Options */
BOOST_CHECK(!parseEDNSOptions(dnsQuestion));
/* And now we add our own ECS */
BOOST_CHECK(handleEDNSClientSubnet(dnsQuestion, ednsAdded, ecsAdded));
BOOST_CHECK_GT(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, true);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet);
validateECS(packet, ids.origRemote);
/* trailing data */
packet = query;
packet.resize(2048);
ednsAdded = false;
ecsAdded = false;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
ids.qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &ids.qtype, &ids.qclass);
BOOST_CHECK_EQUAL(ids.qname, name);
BOOST_CHECK(ids.qtype == QType::A);
BOOST_CHECK(ids.qclass == QClass::IN);
DNSQuestion dnsQuestion2(ids, packet);
BOOST_CHECK(handleEDNSClientSubnet(dnsQuestion2, ednsAdded, ecsAdded));
BOOST_CHECK_GT(packet.size(), query.size());
BOOST_CHECK_LT(packet.size(), 2048U);
BOOST_CHECK_EQUAL(ednsAdded, true);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet);
validateECS(packet, ids.origRemote);
}
BOOST_AUTO_TEST_CASE(addECSWithEDNSNoECS)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote;
DNSName name("www.powerdns.com.");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
packetWriter.addOpt(512, 0, 0);
packetWriter.commit();
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, false, newECSOption));
BOOST_CHECK(packet.size() > query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet);
validateECS(packet, remote);
/* not large enough packet */
consumed = 0;
ednsAdded = false;
ecsAdded = false;
packet = query;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(!handleEDNSClientSubnet(packet, packet.size(), consumed, ednsAdded, ecsAdded, false, newECSOption));
BOOST_CHECK_EQUAL(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet);
}
BOOST_AUTO_TEST_CASE(addECSWithEDNSNoECSAlreadyParsed)
{
InternalQueryState ids;
ids.origRemote = ComboAddress("2001:DB8::1");
ids.protocol = dnsdist::Protocol::DoUDP;
bool ednsAdded = false;
bool ecsAdded = false;
DNSName name("www.powerdns.com.");
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
packetWriter.addOpt(512, 0, 0);
packetWriter.commit();
auto packet = query;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
ids.qname = DNSName(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &ids.qtype, &ids.qclass);
BOOST_CHECK_EQUAL(ids.qname, name);
BOOST_CHECK(ids.qtype == QType::A);
BOOST_CHECK(ids.qclass == QClass::IN);
DNSQuestion dnsQuestion(ids, packet);
/* Parse the options before handling ECS, simulating a Lua rule asking for EDNS Options */
BOOST_CHECK(parseEDNSOptions(dnsQuestion));
/* And now we add our own ECS */
BOOST_CHECK(handleEDNSClientSubnet(dnsQuestion, ednsAdded, ecsAdded));
BOOST_CHECK_GT(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet);
validateECS(packet, ids.origRemote);
/* trailing data */
packet = query;
packet.resize(2048);
ednsAdded = false;
ecsAdded = false;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
ids.qname = DNSName(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &ids.qtype, &ids.qclass);
BOOST_CHECK_EQUAL(ids.qname, name);
BOOST_CHECK(ids.qtype == QType::A);
BOOST_CHECK(ids.qclass == QClass::IN);
DNSQuestion dnsQuestion2(ids, packet);
BOOST_CHECK(handleEDNSClientSubnet(dnsQuestion2, ednsAdded, ecsAdded));
BOOST_CHECK_GT(packet.size(), query.size());
BOOST_CHECK_LT(packet.size(), 2048U);
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet);
validateECS(packet, ids.origRemote);
}
BOOST_AUTO_TEST_CASE(replaceECSWithSameSize)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.168.1.25");
DNSName name("www.powerdns.com.");
ComboAddress origRemote("127.0.0.1");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
EDNSSubnetOpts ecsOpts;
ecsOpts.source = Netmask(origRemote, ECSSourcePrefixV4);
string origECSOption = makeEDNSSubnetOptsString(ecsOpts);
GenericDNSPacketWriter<PacketBuffer>::optvect_t opts;
opts.emplace_back(EDNSOptionCode::ECS, origECSOption);
packetWriter.addOpt(512, 0, 0, opts);
packetWriter.commit();
/* large enough packet */
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK_EQUAL(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet);
validateECS(packet, remote);
}
BOOST_AUTO_TEST_CASE(replaceECSWithSameSizeAlreadyParsed)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.168.1.25");
ComboAddress origRemote("127.0.0.1");
InternalQueryState ids;
ids.origRemote = remote;
ids.protocol = dnsdist::Protocol::DoUDP;
ids.qname = DNSName("www.powerdns.com.");
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, ids.qname, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
EDNSSubnetOpts ecsOpts;
ecsOpts.source = Netmask(origRemote, ECSSourcePrefixV4);
string origECSOption = makeEDNSSubnetOptsString(ecsOpts);
GenericDNSPacketWriter<PacketBuffer>::optvect_t opts;
opts.emplace_back(EDNSOptionCode::ECS, origECSOption);
packetWriter.addOpt(512, 0, 0, opts);
packetWriter.commit();
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
uint16_t qclass = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, &qclass, &consumed);
BOOST_CHECK_EQUAL(qname, ids.qname);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(qclass == QClass::IN);
DNSQuestion dnsQuestion(ids, packet);
dnsQuestion.ecsOverride = true;
/* Parse the options before handling ECS, simulating a Lua rule asking for EDNS Options */
BOOST_CHECK(parseEDNSOptions(dnsQuestion));
/* And now we add our own ECS */
BOOST_CHECK(handleEDNSClientSubnet(dnsQuestion, ednsAdded, ecsAdded));
BOOST_CHECK_EQUAL(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet);
validateECS(packet, remote);
}
BOOST_AUTO_TEST_CASE(replaceECSWithSmaller)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.168.1.25");
DNSName name("www.powerdns.com.");
ComboAddress origRemote("127.0.0.1");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
EDNSSubnetOpts ecsOpts;
ecsOpts.source = Netmask(origRemote, 32);
string origECSOption = makeEDNSSubnetOptsString(ecsOpts);
GenericDNSPacketWriter<PacketBuffer>::optvect_t opts;
opts.emplace_back(EDNSOptionCode::ECS, origECSOption);
packetWriter.addOpt(512, 0, 0, opts);
packetWriter.commit();
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK(packet.size() < query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet);
validateECS(packet, remote);
}
BOOST_AUTO_TEST_CASE(replaceECSWithLarger)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.168.1.25");
DNSName name("www.powerdns.com.");
ComboAddress origRemote("127.0.0.1");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
EDNSSubnetOpts ecsOpts;
// smaller (less specific so less bits) option
static_assert(8 < ECSSourcePrefixV4, "The ECS scope should be smaller");
ecsOpts.source = Netmask(origRemote, 8);
string origECSOption = makeEDNSSubnetOptsString(ecsOpts);
GenericDNSPacketWriter<PacketBuffer>::optvect_t opts;
opts.emplace_back(EDNSOptionCode::ECS, origECSOption);
packetWriter.addOpt(512, 0, 0, opts);
packetWriter.commit();
/* large enough packet */
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK(packet.size() > query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet);
validateECS(packet, remote);
/* not large enough packet */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(!handleEDNSClientSubnet(packet, packet.size(), consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK_EQUAL(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet);
}
BOOST_AUTO_TEST_CASE(replaceECSFollowedByTSIG)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.168.1.25");
DNSName name("www.powerdns.com.");
ComboAddress origRemote("127.0.0.1");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
EDNSSubnetOpts ecsOpts;
ecsOpts.source = Netmask(origRemote, 8);
string origECSOption = makeEDNSSubnetOptsString(ecsOpts);
GenericDNSPacketWriter<PacketBuffer>::optvect_t opts;
opts.emplace_back(EDNSOptionCode::ECS, origECSOption);
packetWriter.addOpt(512, 0, 0, opts);
packetWriter.startRecord(DNSName("tsigname."), QType::TSIG, 0, QClass::ANY, DNSResourceRecord::ADDITIONAL, false);
packetWriter.commit();
/* large enough packet */
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK(packet.size() > query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet, true, false, 1);
validateECS(packet, remote);
/* not large enough packet */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(!handleEDNSClientSubnet(packet, packet.size(), consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK_EQUAL(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet, true, false, 1);
}
BOOST_AUTO_TEST_CASE(replaceECSAfterAN)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.168.1.25");
DNSName name("www.powerdns.com.");
ComboAddress origRemote("127.0.0.1");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
packetWriter.startRecord(DNSName("powerdns.com."), QType::A, 0, QClass::IN, DNSResourceRecord::ANSWER, true);
packetWriter.commit();
EDNSSubnetOpts ecsOpts;
ecsOpts.source = Netmask(origRemote, 8);
string origECSOption = makeEDNSSubnetOptsString(ecsOpts);
GenericDNSPacketWriter<PacketBuffer>::optvect_t opts;
opts.emplace_back(EDNSOptionCode::ECS, origECSOption);
packetWriter.addOpt(512, 0, 0, opts);
packetWriter.commit();
/* large enough packet */
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK(packet.size() > query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet, true, false, 0, 1, 0);
validateECS(packet, remote);
/* not large enough packet */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(!handleEDNSClientSubnet(packet, packet.size(), consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK_EQUAL(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet, true, false, 0, 1, 0);
}
BOOST_AUTO_TEST_CASE(replaceECSAfterAuth)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.168.1.25");
DNSName name("www.powerdns.com.");
ComboAddress origRemote("127.0.0.1");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
packetWriter.startRecord(DNSName("powerdns.com."), QType::A, 0, QClass::IN, DNSResourceRecord::AUTHORITY, true);
packetWriter.commit();
EDNSSubnetOpts ecsOpts;
ecsOpts.source = Netmask(origRemote, 8);
string origECSOption = makeEDNSSubnetOptsString(ecsOpts);
GenericDNSPacketWriter<PacketBuffer>::optvect_t opts;
opts.emplace_back(EDNSOptionCode::ECS, origECSOption);
packetWriter.addOpt(512, 0, 0, opts);
packetWriter.commit();
/* large enough packet */
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK(packet.size() > query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet, true, false, 0, 0, 1);
validateECS(packet, remote);
/* not large enough packet */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(!handleEDNSClientSubnet(packet, packet.size(), consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK_EQUAL(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet, true, false, 0, 0, 1);
}
BOOST_AUTO_TEST_CASE(replaceECSBetweenTwoRecords)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.168.1.25");
DNSName name("www.powerdns.com.");
ComboAddress origRemote("127.0.0.1");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
EDNSSubnetOpts ecsOpts;
ecsOpts.source = Netmask(origRemote, 8);
string origECSOption = makeEDNSSubnetOptsString(ecsOpts);
GenericDNSPacketWriter<PacketBuffer>::optvect_t opts;
opts.emplace_back(EDNSOptionCode::ECS, origECSOption);
packetWriter.startRecord(DNSName("additional"), QType::A, 0, QClass::IN, DNSResourceRecord::ADDITIONAL, false);
packetWriter.xfr32BitInt(0x01020304);
packetWriter.addOpt(512, 0, 0, opts);
packetWriter.startRecord(DNSName("tsigname."), QType::TSIG, 0, QClass::ANY, DNSResourceRecord::ADDITIONAL, false);
packetWriter.commit();
/* large enough packet */
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK(packet.size() > query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet, true, false, 2);
validateECS(packet, remote);
/* not large enough packet */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(!handleEDNSClientSubnet(packet, packet.size(), consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK_EQUAL(packet.size(), query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, false);
validateQuery(packet, true, false, 2);
}
BOOST_AUTO_TEST_CASE(insertECSInEDNSBetweenTwoRecords)
{
bool ednsAdded = false;
bool ecsAdded = false;
ComboAddress remote("192.168.1.25");
DNSName name("www.powerdns.com.");
ComboAddress origRemote("127.0.0.1");
string newECSOption;
generateECSOption(remote, newECSOption, remote.sin4.sin_family == AF_INET ? ECSSourcePrefixV4 : ECSSourcePrefixV6);
PacketBuffer query;
GenericDNSPacketWriter<PacketBuffer> packetWriter(query, name, QType::A, QClass::IN, 0);
packetWriter.getHeader()->rd = 1;
packetWriter.startRecord(DNSName("additional"), QType::A, 0, QClass::IN, DNSResourceRecord::ADDITIONAL, false);
packetWriter.xfr32BitInt(0x01020304);
packetWriter.addOpt(512, 0, 0);
packetWriter.startRecord(DNSName("tsigname."), QType::TSIG, 0, QClass::ANY, DNSResourceRecord::ADDITIONAL, false);
packetWriter.commit();
/* large enough packet */
auto packet = query;
unsigned int consumed = 0;
uint16_t qtype = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
DNSName qname(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);
BOOST_CHECK(handleEDNSClientSubnet(packet, 4096, consumed, ednsAdded, ecsAdded, true, newECSOption));
BOOST_CHECK(packet.size() > query.size());
BOOST_CHECK_EQUAL(ednsAdded, false);
BOOST_CHECK_EQUAL(ecsAdded, true);
validateQuery(packet, true, false, 2);
validateECS(packet, remote);
/* not large enough packet */
packet = query;
ednsAdded = false;
ecsAdded = false;
consumed = 0;
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
qname = DNSName(reinterpret_cast<const char*>(packet.data()), packet.size(), sizeof(dnsheader), false, &qtype, nullptr, &consumed);
BOOST_CHECK_EQUAL(qname, name);
BOOST_CHECK(qtype == QType::A);