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#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 "ednsoptions.hh"
#include "ednssubnet.hh"
#include "iputils.hh"
/* extract a specific EDNS0 option from a pointer on the beginning rdLen of the OPT RR */
int getEDNSOption(char* optRR, size_t len, uint16_t wantedOption, char ** optionValue, size_t * optionValueSize);
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;
cookiesOpt.client = clientCookie;
cookiesOpt.server = serverCookie;
string cookiesOptionStr = makeEDNSCookiesOptString(cookiesOpt);
EDNSSubnetOpts ecsOpts;
ecsOpts.source = ecs;
string origECSOptionStr = makeEDNSSubnetOptsString(ecsOpts);
DNSPacketWriter::optvect_t opts;
opts.push_back(make_pair(EDNSOptionCode::COOKIE, cookiesOptionStr));
opts.push_back(make_pair(EDNSOptionCode::ECS, origECSOptionStr));
opts.push_back(make_pair(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);
char* ecsStart = nullptr;
size_t ecsLen = 0;
int res = getEDNSOption(reinterpret_cast<char*>(query.data())+pos+9, questionLen - pos - 9, EDNSOptionCode::ECS, &ecsStart, &ecsLen);
BOOST_CHECK_EQUAL(res, 0);
EDNSSubnetOpts eso;
BOOST_REQUIRE(getEDNSSubnetOptsFromString(ecsStart + 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);
std::map<uint16_t, EDNSOptionView> 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 keep one */
BOOST_CHECK_EQUAL(options.size(), 2);
auto it = options.find(EDNSOptionCode::ECS);
BOOST_REQUIRE(it != options.end());
BOOST_REQUIRE(it->second.content != nullptr);
BOOST_REQUIRE_GT(it->second.size, 0);
EDNSSubnetOpts eso;
BOOST_REQUIRE(getEDNSSubnetOptsFromString(it->second.content, it->second.size, &eso));
BOOST_CHECK(eso.source == ecs);
it = options.find(EDNSOptionCode::COOKIE);
BOOST_REQUIRE(it != options.end());
BOOST_REQUIRE(it->second.content != nullptr);
BOOST_REQUIRE_GT(it->second.size, 0);
}
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 */
BOOST_REQUIRE_EQUAL(ntohs(*(reinterpret_cast<const uint16_t*>(&ecsOptionStr.at(0)))), 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);
}
BOOST_AUTO_TEST_SUITE_END()
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