Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Luke Huang | e126fbe | 2019-07-20 17:36:30 +0800 | [diff] [blame] | 17 | #include <netdb.h> |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 18 | |
Mike Yu | c7649d1 | 2019-05-22 15:28:07 +0800 | [diff] [blame] | 19 | #include <array> |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 20 | #include <atomic> |
| 21 | #include <chrono> |
| 22 | #include <ctime> |
| 23 | #include <thread> |
| 24 | |
| 25 | #include <android-base/logging.h> |
| 26 | #include <android-base/stringprintf.h> |
| 27 | #include <android/multinetwork.h> |
Luke Huang | e126fbe | 2019-07-20 17:36:30 +0800 | [diff] [blame] | 28 | #include <cutils/properties.h> |
| 29 | #include <gmock/gmock-matchers.h> |
| 30 | #include <gtest/gtest.h> |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 31 | |
Mike Yu | c7649d1 | 2019-05-22 15:28:07 +0800 | [diff] [blame] | 32 | #include "netd_resolv/stats.h" |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 33 | #include "resolv_cache.h" |
| 34 | #include "resolv_private.h" |
chenbruce | b43ec75 | 2019-07-24 20:19:41 +0800 | [diff] [blame] | 35 | #include "tests/dns_responder/dns_responder.h" |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 36 | |
| 37 | using namespace std::chrono_literals; |
| 38 | |
| 39 | constexpr int TEST_NETID = 30; |
| 40 | constexpr int TEST_NETID_2 = 31; |
| 41 | |
| 42 | // Constant values sync'd from res_cache.cpp |
| 43 | constexpr int DNS_HEADER_SIZE = 12; |
| 44 | constexpr int MAX_ENTRIES = 64 * 2 * 5; |
| 45 | constexpr int MAXPACKET = 8 * 1024; |
| 46 | |
| 47 | namespace { |
| 48 | |
| 49 | struct CacheEntry { |
| 50 | std::vector<char> query; |
| 51 | std::vector<char> answer; |
| 52 | }; |
| 53 | |
Mike Yu | c7649d1 | 2019-05-22 15:28:07 +0800 | [diff] [blame] | 54 | struct SetupParams { |
| 55 | std::vector<std::string> servers; |
| 56 | std::vector<std::string> domains; |
| 57 | res_params params; |
| 58 | }; |
| 59 | |
| 60 | struct CacheStats { |
| 61 | SetupParams setup; |
| 62 | std::vector<res_stats> stats; |
| 63 | int pendingReqTimeoutCount; |
| 64 | }; |
| 65 | |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 66 | std::vector<char> makeQuery(int op, const char* qname, int qclass, int qtype) { |
| 67 | res_state res = res_get_state(); |
| 68 | uint8_t buf[MAXPACKET] = {}; |
| 69 | const int len = res_nmkquery(res, op, qname, qclass, qtype, NULL, 0, NULL, buf, sizeof(buf)); |
| 70 | return std::vector<char>(buf, buf + len); |
| 71 | } |
| 72 | |
| 73 | std::vector<char> makeAnswer(const std::vector<char>& query, const char* rdata_str, |
| 74 | const unsigned ttl) { |
| 75 | test::DNSHeader header; |
| 76 | header.read(query.data(), query.data() + query.size()); |
| 77 | |
| 78 | for (const test::DNSQuestion& question : header.questions) { |
| 79 | std::string rname(question.qname.name); |
| 80 | test::DNSRecord record{ |
| 81 | .name = {.name = question.qname.name}, |
| 82 | .rtype = question.qtype, |
| 83 | .rclass = question.qclass, |
| 84 | .ttl = ttl, |
| 85 | }; |
| 86 | test::DNSResponder::fillAnswerRdata(rdata_str, record); |
| 87 | header.answers.push_back(std::move(record)); |
| 88 | } |
| 89 | |
| 90 | char answer[MAXPACKET] = {}; |
| 91 | char* answer_end = header.write(answer, answer + sizeof(answer)); |
| 92 | return std::vector<char>(answer, answer_end); |
| 93 | } |
| 94 | |
| 95 | // Get the current time in unix timestamp since the Epoch. |
| 96 | time_t currentTime() { |
| 97 | return std::time(nullptr); |
| 98 | } |
| 99 | |
Mike Yu | c7649d1 | 2019-05-22 15:28:07 +0800 | [diff] [blame] | 100 | std::string addrToString(const sockaddr_storage* addr) { |
| 101 | char out[INET6_ADDRSTRLEN] = {0}; |
| 102 | getnameinfo((const sockaddr*)addr, sizeof(sockaddr_storage), out, INET6_ADDRSTRLEN, nullptr, 0, |
| 103 | NI_NUMERICHOST); |
| 104 | return std::string(out); |
| 105 | } |
| 106 | |
| 107 | // Comparison for res_stats. Simply check the count in the cache test. |
| 108 | bool operator==(const res_stats& a, const res_stats& b) { |
| 109 | return std::tie(a.sample_count, a.sample_next) == std::tie(b.sample_count, b.sample_next); |
| 110 | } |
| 111 | |
| 112 | // Comparison for res_params. |
| 113 | bool operator==(const res_params& a, const res_params& b) { |
| 114 | return std::tie(a.sample_validity, a.success_threshold, a.min_samples, a.max_samples, |
| 115 | a.base_timeout_msec, a.retry_count) == |
| 116 | std::tie(b.sample_validity, b.success_threshold, b.min_samples, b.max_samples, |
| 117 | b.base_timeout_msec, b.retry_count); |
| 118 | } |
| 119 | |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 120 | } // namespace |
| 121 | |
| 122 | class ResolvCacheTest : public ::testing::Test { |
| 123 | protected: |
Mike Yu | c7649d1 | 2019-05-22 15:28:07 +0800 | [diff] [blame] | 124 | static constexpr res_params kParams = { |
| 125 | .sample_validity = 300, |
| 126 | .success_threshold = 25, |
| 127 | .min_samples = 8, |
| 128 | .max_samples = 8, |
| 129 | .base_timeout_msec = 1000, |
| 130 | .retry_count = 2, |
| 131 | }; |
| 132 | |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 133 | ResolvCacheTest() { |
| 134 | // Store the default one and conceal 10000+ lines of resolver cache logs. |
| 135 | defaultLogSeverity = android::base::SetMinimumLogSeverity( |
| 136 | static_cast<android::base::LogSeverity>(android::base::WARNING)); |
| 137 | } |
| 138 | ~ResolvCacheTest() { |
| 139 | cacheDelete(TEST_NETID); |
| 140 | cacheDelete(TEST_NETID_2); |
| 141 | |
| 142 | // Restore the log severity. |
| 143 | android::base::SetMinimumLogSeverity(defaultLogSeverity); |
| 144 | } |
| 145 | |
| 146 | [[nodiscard]] bool cacheLookup(ResolvCacheStatus expectedCacheStatus, uint32_t netId, |
| 147 | const CacheEntry& ce, uint32_t flags = 0) { |
| 148 | int anslen = 0; |
| 149 | std::vector<char> answer(MAXPACKET); |
| 150 | const auto cacheStatus = resolv_cache_lookup(netId, ce.query.data(), ce.query.size(), |
| 151 | answer.data(), answer.size(), &anslen, flags); |
| 152 | if (cacheStatus != expectedCacheStatus) { |
| 153 | ADD_FAILURE() << "cacheStatus: expected = " << expectedCacheStatus |
| 154 | << ", actual =" << cacheStatus; |
| 155 | return false; |
| 156 | } |
| 157 | |
| 158 | if (cacheStatus == RESOLV_CACHE_FOUND) { |
| 159 | answer.resize(anslen); |
| 160 | if (answer != ce.answer) { |
| 161 | ADD_FAILURE() << "The answer from the cache is not as expected."; |
| 162 | return false; |
| 163 | } |
| 164 | } |
| 165 | return true; |
| 166 | } |
| 167 | |
| 168 | int cacheCreate(uint32_t netId) { |
| 169 | return resolv_create_cache_for_net(netId); |
| 170 | } |
| 171 | |
| 172 | void cacheDelete(uint32_t netId) { |
| 173 | resolv_delete_cache_for_net(netId); |
| 174 | } |
| 175 | |
| 176 | int cacheAdd(uint32_t netId, const CacheEntry& ce) { |
| 177 | return resolv_cache_add(netId, ce.query.data(), ce.query.size(), ce.answer.data(), |
| 178 | ce.answer.size()); |
| 179 | } |
| 180 | |
| 181 | int cacheAdd(uint32_t netId, const std::vector<char>& query, const std::vector<char>& answer) { |
| 182 | return resolv_cache_add(netId, query.data(), query.size(), answer.data(), answer.size()); |
| 183 | } |
| 184 | |
| 185 | int cacheGetExpiration(uint32_t netId, const std::vector<char>& query, time_t* expiration) { |
| 186 | return resolv_cache_get_expiration(netId, query, expiration); |
| 187 | } |
| 188 | |
| 189 | void cacheQueryFailed(uint32_t netId, const CacheEntry& ce, uint32_t flags) { |
| 190 | _resolv_cache_query_failed(netId, ce.query.data(), ce.query.size(), flags); |
| 191 | } |
| 192 | |
Mike Yu | c7649d1 | 2019-05-22 15:28:07 +0800 | [diff] [blame] | 193 | int cacheSetupResolver(uint32_t netId, const SetupParams& setup) { |
| 194 | return resolv_set_nameservers(netId, setup.servers, setup.domains, setup.params); |
| 195 | } |
| 196 | |
| 197 | void expectCacheStats(const std::string& msg, uint32_t netId, const CacheStats& expected) { |
| 198 | int nscount = -1; |
| 199 | sockaddr_storage servers[MAXNS]; |
| 200 | int dcount = -1; |
| 201 | char domains[MAXDNSRCH][MAXDNSRCHPATH]; |
| 202 | res_stats stats[MAXNS]; |
| 203 | res_params params = {}; |
| 204 | int res_wait_for_pending_req_timeout_count; |
| 205 | android_net_res_stats_get_info_for_net(netId, &nscount, servers, &dcount, domains, ¶ms, |
| 206 | stats, &res_wait_for_pending_req_timeout_count); |
| 207 | |
| 208 | // Server checking. |
| 209 | EXPECT_EQ(nscount, static_cast<int>(expected.setup.servers.size())) << msg; |
| 210 | for (int i = 0; i < nscount; i++) { |
| 211 | EXPECT_EQ(addrToString(&servers[i]), expected.setup.servers[i]) << msg; |
| 212 | } |
| 213 | |
| 214 | // Domain checking |
| 215 | EXPECT_EQ(dcount, static_cast<int>(expected.setup.domains.size())) << msg; |
| 216 | for (int i = 0; i < dcount; i++) { |
| 217 | EXPECT_EQ(std::string(domains[i]), expected.setup.domains[i]) << msg; |
| 218 | } |
| 219 | |
| 220 | // res_params checking. |
| 221 | EXPECT_TRUE(params == expected.setup.params) << msg; |
| 222 | |
| 223 | // res_stats checking. |
| 224 | for (size_t i = 0; i < expected.stats.size(); i++) { |
| 225 | EXPECT_TRUE(stats[i] == expected.stats[i]) << msg; |
| 226 | } |
| 227 | |
| 228 | // wait_for_pending_req_timeout_count checking. |
| 229 | EXPECT_EQ(res_wait_for_pending_req_timeout_count, expected.pendingReqTimeoutCount) << msg; |
| 230 | } |
| 231 | |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 232 | CacheEntry makeCacheEntry(int op, const char* qname, int qclass, int qtype, const char* rdata, |
| 233 | std::chrono::seconds ttl = 10s) { |
| 234 | CacheEntry ce; |
| 235 | ce.query = makeQuery(op, qname, qclass, qtype); |
| 236 | ce.answer = makeAnswer(ce.query, rdata, static_cast<unsigned>(ttl.count())); |
| 237 | return ce; |
| 238 | } |
| 239 | |
| 240 | private: |
| 241 | android::base::LogSeverity defaultLogSeverity; |
| 242 | }; |
| 243 | |
| 244 | TEST_F(ResolvCacheTest, CreateAndDeleteCache) { |
| 245 | // Create the cache for network 1. |
| 246 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 247 | EXPECT_EQ(-EEXIST, cacheCreate(TEST_NETID)); |
| 248 | EXPECT_TRUE(has_named_cache(TEST_NETID)); |
| 249 | |
| 250 | // Create the cache for network 2. |
| 251 | EXPECT_EQ(0, cacheCreate(TEST_NETID_2)); |
| 252 | EXPECT_EQ(-EEXIST, cacheCreate(TEST_NETID_2)); |
| 253 | EXPECT_TRUE(has_named_cache(TEST_NETID_2)); |
| 254 | |
| 255 | // Delete the cache in network 1. |
| 256 | cacheDelete(TEST_NETID); |
| 257 | EXPECT_FALSE(has_named_cache(TEST_NETID)); |
| 258 | EXPECT_TRUE(has_named_cache(TEST_NETID_2)); |
| 259 | } |
| 260 | |
| 261 | // Missing checks for the argument 'answer'. |
| 262 | TEST_F(ResolvCacheTest, CacheAdd_InvalidArgs) { |
| 263 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 264 | |
| 265 | const std::vector<char> queryEmpty(MAXPACKET, 0); |
| 266 | const std::vector<char> queryTooSmall(DNS_HEADER_SIZE - 1, 0); |
| 267 | CacheEntry ce = makeCacheEntry(QUERY, "valid.cache", ns_c_in, ns_t_a, "1.2.3.4"); |
| 268 | |
| 269 | EXPECT_EQ(-EINVAL, cacheAdd(TEST_NETID, queryEmpty, ce.answer)); |
| 270 | EXPECT_EQ(-EINVAL, cacheAdd(TEST_NETID, queryTooSmall, ce.answer)); |
| 271 | |
| 272 | // Cache not existent in TEST_NETID_2. |
| 273 | EXPECT_EQ(-ENONET, cacheAdd(TEST_NETID_2, ce)); |
| 274 | } |
| 275 | |
| 276 | TEST_F(ResolvCacheTest, CacheAdd_DuplicateEntry) { |
| 277 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 278 | CacheEntry ce = makeCacheEntry(QUERY, "existent.in.cache", ns_c_in, ns_t_a, "1.2.3.4"); |
| 279 | time_t now = currentTime(); |
| 280 | |
| 281 | // Add the cache entry. |
| 282 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 283 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 284 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 285 | |
| 286 | // Get the expiration time and verify its value is greater than now. |
| 287 | time_t expiration1; |
| 288 | EXPECT_EQ(0, cacheGetExpiration(TEST_NETID, ce.query, &expiration1)); |
| 289 | EXPECT_GT(expiration1, now); |
| 290 | |
| 291 | // Adding the duplicate entry will return an error, and the expiration time won't be modified. |
| 292 | EXPECT_EQ(-EEXIST, cacheAdd(TEST_NETID, ce)); |
| 293 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 294 | time_t expiration2; |
| 295 | EXPECT_EQ(0, cacheGetExpiration(TEST_NETID, ce.query, &expiration2)); |
| 296 | EXPECT_EQ(expiration1, expiration2); |
| 297 | } |
| 298 | |
| 299 | TEST_F(ResolvCacheTest, CacheLookup) { |
| 300 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 301 | EXPECT_EQ(0, cacheCreate(TEST_NETID_2)); |
| 302 | CacheEntry ce = makeCacheEntry(QUERY, "existent.in.cache", ns_c_in, ns_t_a, "1.2.3.4"); |
| 303 | |
| 304 | // Cache found in network 1. |
| 305 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 306 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 307 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 308 | |
| 309 | // No cache found in network 2. |
| 310 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID_2, ce)); |
| 311 | |
| 312 | ce = makeCacheEntry(QUERY, "existent.in.cache", ns_c_in, ns_t_aaaa, "2001:db8::1.2.3.4"); |
| 313 | |
| 314 | // type A and AAAA are independent. |
| 315 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 316 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 317 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 318 | } |
| 319 | |
| 320 | TEST_F(ResolvCacheTest, CacheLookup_CacheFlags) { |
| 321 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 322 | std::vector<char> answerFromCache; |
| 323 | CacheEntry ce = makeCacheEntry(QUERY, "existent.in.cache", ns_c_in, ns_t_a, "1.2.3.4"); |
| 324 | |
| 325 | // The entry can't be found when only no-cache-lookup bit is carried. |
| 326 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce, ANDROID_RESOLV_NO_CACHE_LOOKUP)); |
| 327 | |
| 328 | // Ensure RESOLV_CACHE_SKIP is returned when there's no such the same entry in the cache. |
| 329 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_SKIP, TEST_NETID, ce, ANDROID_RESOLV_NO_CACHE_STORE)); |
| 330 | |
| 331 | // Skip the cache lookup if no-cache-lookup and no-cache-store bits are carried |
| 332 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_SKIP, TEST_NETID, ce, |
| 333 | ANDROID_RESOLV_NO_CACHE_LOOKUP | ANDROID_RESOLV_NO_CACHE_STORE)); |
| 334 | |
| 335 | // Add the cache entry. |
| 336 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 337 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 338 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 339 | |
| 340 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce, ANDROID_RESOLV_NO_CACHE_LOOKUP)); |
| 341 | |
| 342 | // Now no-cache-store has no effect if a same entry is existent in the cache. |
| 343 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce, ANDROID_RESOLV_NO_CACHE_STORE)); |
| 344 | |
| 345 | // Skip the cache lookup again regardless of a same entry being already in the cache. |
| 346 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_SKIP, TEST_NETID, ce, |
| 347 | ANDROID_RESOLV_NO_CACHE_LOOKUP | ANDROID_RESOLV_NO_CACHE_STORE)); |
| 348 | } |
| 349 | |
| 350 | TEST_F(ResolvCacheTest, CacheLookup_Types) { |
| 351 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 352 | static const struct QueryTypes { |
| 353 | int type; |
| 354 | std::string rdata; |
| 355 | } Types[] = { |
| 356 | {ns_t_a, "1.2.3.4"}, |
| 357 | {ns_t_aaaa, "2001:db8::1.2.3.4"}, |
| 358 | {ns_t_ptr, "4.3.2.1.in-addr.arpa."}, |
| 359 | {ns_t_ptr, "4.0.3.0.2.0.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa."}, |
| 360 | }; |
| 361 | |
| 362 | for (const auto& t : Types) { |
| 363 | std::string name = android::base::StringPrintf("cache.lookup.type.%s", t.rdata.c_str()); |
| 364 | SCOPED_TRACE(name); |
| 365 | |
| 366 | CacheEntry ce = makeCacheEntry(QUERY, name.data(), ns_c_in, t.type, t.rdata.data()); |
| 367 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 368 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 369 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | TEST_F(ResolvCacheTest, CacheLookup_InvalidArgs) { |
| 374 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 375 | |
| 376 | const std::vector<char> queryEmpty(MAXPACKET, 0); |
| 377 | const std::vector<char> queryTooSmall(DNS_HEADER_SIZE - 1, 0); |
| 378 | std::vector<char> answerTooSmall(DNS_HEADER_SIZE - 1, 0); |
| 379 | const CacheEntry ce = makeCacheEntry(QUERY, "valid.cache", ns_c_in, ns_t_a, "1.2.3.4"); |
| 380 | auto cacheLookupFn = [](const std::vector<char>& query, |
| 381 | std::vector<char> answer) -> ResolvCacheStatus { |
| 382 | int anslen = 0; |
| 383 | return resolv_cache_lookup(TEST_NETID, query.data(), query.size(), answer.data(), |
| 384 | answer.size(), &anslen, 0); |
| 385 | }; |
| 386 | |
| 387 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 388 | |
| 389 | EXPECT_EQ(RESOLV_CACHE_UNSUPPORTED, cacheLookupFn(queryEmpty, ce.answer)); |
| 390 | EXPECT_EQ(RESOLV_CACHE_UNSUPPORTED, cacheLookupFn(queryTooSmall, ce.answer)); |
| 391 | EXPECT_EQ(RESOLV_CACHE_UNSUPPORTED, cacheLookupFn(ce.query, answerTooSmall)); |
| 392 | |
| 393 | // It can actually be found with valid arguments. |
| 394 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 395 | |
| 396 | // Cache not existent in TEST_NETID_2. |
| 397 | EXPECT_EQ(-ENONET, cacheAdd(TEST_NETID_2, ce)); |
| 398 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_UNSUPPORTED, TEST_NETID_2, ce)); |
| 399 | } |
| 400 | |
| 401 | TEST_F(ResolvCacheTest, CacheLookup_Expired) { |
| 402 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 403 | |
| 404 | // An entry with zero ttl won't be stored in the cache. |
| 405 | CacheEntry ce = makeCacheEntry(QUERY, "expired.in.0s", ns_c_in, ns_t_a, "1.2.3.4", 0s); |
| 406 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 407 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 408 | |
| 409 | // Create an entry expired in 1s. |
| 410 | ce = makeCacheEntry(QUERY, "expired.in.1s", ns_c_in, ns_t_a, "1.2.3.4", 1s); |
| 411 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 412 | |
| 413 | // Cache found. |
| 414 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 415 | time_t expiration; |
| 416 | EXPECT_EQ(0, cacheGetExpiration(TEST_NETID, ce.query, &expiration)); |
| 417 | |
| 418 | // Wait for the cache expired. |
| 419 | std::this_thread::sleep_for(1500ms); |
| 420 | EXPECT_GE(currentTime(), expiration); |
| 421 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 422 | } |
| 423 | |
| 424 | TEST_F(ResolvCacheTest, PendingRequest_QueryDeferred) { |
| 425 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 426 | EXPECT_EQ(0, cacheCreate(TEST_NETID_2)); |
| 427 | |
| 428 | CacheEntry ce = makeCacheEntry(QUERY, "query.deferred", ns_c_in, ns_t_a, "1.2.3.4"); |
| 429 | std::atomic_bool done(false); |
| 430 | |
| 431 | // This is the first lookup. The following lookups from other threads will be in the |
| 432 | // pending request list. |
| 433 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 434 | |
| 435 | std::vector<std::thread> threads(5); |
| 436 | for (std::thread& thread : threads) { |
| 437 | thread = std::thread([&]() { |
| 438 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 439 | |
| 440 | // Ensure this thread gets stuck in lookups before we wake it. |
| 441 | EXPECT_TRUE(done); |
| 442 | }); |
| 443 | } |
| 444 | |
| 445 | // Wait for a while for the threads performing lookups. |
| 446 | // TODO: Perhaps implement a test-only function to get the number of pending requests |
| 447 | // instead of sleep. |
| 448 | std::this_thread::sleep_for(100ms); |
| 449 | |
| 450 | // The threads keep waiting regardless of any other networks or even if cache flag is set. |
| 451 | EXPECT_EQ(0, cacheAdd(TEST_NETID_2, ce)); |
| 452 | cacheQueryFailed(TEST_NETID, ce, ANDROID_RESOLV_NO_CACHE_STORE); |
| 453 | cacheQueryFailed(TEST_NETID, ce, ANDROID_RESOLV_NO_CACHE_LOOKUP); |
| 454 | cacheQueryFailed(TEST_NETID_2, ce, ANDROID_RESOLV_NO_CACHE_STORE); |
| 455 | cacheQueryFailed(TEST_NETID_2, ce, ANDROID_RESOLV_NO_CACHE_LOOKUP); |
| 456 | cacheDelete(TEST_NETID_2); |
| 457 | |
| 458 | // Ensure none of the threads has finished the lookups. |
| 459 | std::this_thread::sleep_for(100ms); |
| 460 | |
| 461 | // Wake up the threads |
| 462 | done = true; |
| 463 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 464 | |
| 465 | for (std::thread& thread : threads) { |
| 466 | thread.join(); |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | TEST_F(ResolvCacheTest, PendingRequest_QueryFailed) { |
| 471 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 472 | |
| 473 | CacheEntry ce = makeCacheEntry(QUERY, "query.failed", ns_c_in, ns_t_a, "1.2.3.4"); |
| 474 | std::atomic_bool done(false); |
| 475 | |
| 476 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 477 | |
| 478 | std::vector<std::thread> threads(5); |
| 479 | for (std::thread& thread : threads) { |
| 480 | thread = std::thread([&]() { |
| 481 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 482 | |
| 483 | // Ensure this thread gets stuck in lookups before we wake it. |
| 484 | EXPECT_TRUE(done); |
| 485 | }); |
| 486 | } |
| 487 | |
| 488 | // Wait for a while for the threads performing lookups. |
| 489 | std::this_thread::sleep_for(100ms); |
| 490 | |
| 491 | // Wake up the threads |
| 492 | done = true; |
| 493 | cacheQueryFailed(TEST_NETID, ce, 0); |
| 494 | |
| 495 | for (std::thread& thread : threads) { |
| 496 | thread.join(); |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | TEST_F(ResolvCacheTest, PendingRequest_CacheDestroyed) { |
| 501 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 502 | EXPECT_EQ(0, cacheCreate(TEST_NETID_2)); |
| 503 | |
| 504 | CacheEntry ce = makeCacheEntry(QUERY, "query.failed", ns_c_in, ns_t_a, "1.2.3.4"); |
| 505 | std::atomic_bool done(false); |
| 506 | |
| 507 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 508 | |
| 509 | std::vector<std::thread> threads(5); |
| 510 | for (std::thread& thread : threads) { |
| 511 | thread = std::thread([&]() { |
| 512 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce)); |
| 513 | |
| 514 | // Ensure this thread gets stuck in lookups before we wake it. |
| 515 | EXPECT_TRUE(done); |
| 516 | }); |
| 517 | } |
| 518 | |
| 519 | // Wait for a while for the threads performing lookups. |
| 520 | std::this_thread::sleep_for(100ms); |
| 521 | |
| 522 | // Deleting another network must not cause the threads to wake up. |
| 523 | cacheDelete(TEST_NETID_2); |
| 524 | |
| 525 | // Ensure none of the threads has finished the lookups. |
| 526 | std::this_thread::sleep_for(100ms); |
| 527 | |
| 528 | // Wake up the threads |
| 529 | done = true; |
| 530 | cacheDelete(TEST_NETID); |
| 531 | |
| 532 | for (std::thread& thread : threads) { |
| 533 | thread.join(); |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | TEST_F(ResolvCacheTest, MaxEntries) { |
| 538 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 539 | std::vector<CacheEntry> ces; |
| 540 | |
| 541 | for (int i = 0; i < 2 * MAX_ENTRIES; i++) { |
| 542 | std::string qname = android::base::StringPrintf("cache.%04d", i); |
| 543 | SCOPED_TRACE(qname); |
| 544 | CacheEntry ce = makeCacheEntry(QUERY, qname.data(), ns_c_in, ns_t_a, "1.2.3.4"); |
| 545 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 546 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 547 | ces.emplace_back(ce); |
| 548 | } |
| 549 | |
| 550 | for (int i = 0; i < 2 * MAX_ENTRIES; i++) { |
| 551 | std::string qname = android::base::StringPrintf("cache.%04d", i); |
| 552 | SCOPED_TRACE(qname); |
| 553 | if (i < MAX_ENTRIES) { |
| 554 | // Because the cache is LRU, the oldest queries should have been purged, |
| 555 | // and the most recent MAX_ENTRIES ones should still be present. |
| 556 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ces[i])); |
| 557 | } else { |
| 558 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ces[i])); |
| 559 | } |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | TEST_F(ResolvCacheTest, CacheFull) { |
| 564 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 565 | |
| 566 | CacheEntry ce1 = makeCacheEntry(QUERY, "cache.0000", ns_c_in, ns_t_a, "1.2.3.4", 100s); |
| 567 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce1)); |
| 568 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce1)); |
| 569 | |
| 570 | CacheEntry ce2 = makeCacheEntry(QUERY, "cache.0001", ns_c_in, ns_t_a, "1.2.3.4", 1s); |
| 571 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce2)); |
| 572 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce2)); |
| 573 | |
| 574 | // Stuff the resolver cache. |
| 575 | for (int i = 2; i < MAX_ENTRIES; i++) { |
| 576 | std::string qname = android::base::StringPrintf("cache.%04d", i); |
| 577 | SCOPED_TRACE(qname); |
| 578 | CacheEntry ce = makeCacheEntry(QUERY, qname.data(), ns_c_in, ns_t_a, "1.2.3.4", 50s); |
| 579 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce)); |
| 580 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce)); |
| 581 | } |
| 582 | |
| 583 | // Wait for ce2 expired. |
| 584 | std::this_thread::sleep_for(1500ms); |
| 585 | |
| 586 | // The cache is full now, and the expired ce2 will be removed first. |
| 587 | CacheEntry ce3 = makeCacheEntry(QUERY, "cache.overfilled.1", ns_c_in, ns_t_a, "1.2.3.4", 50s); |
| 588 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce3)); |
| 589 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce3)); |
| 590 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce2)); |
| 591 | |
| 592 | // The cache is full again but there's no one expired, so the oldest ce1 will be removed. |
| 593 | CacheEntry ce4 = makeCacheEntry(QUERY, "cache.overfilled.2", ns_c_in, ns_t_a, "1.2.3.4", 50s); |
| 594 | EXPECT_EQ(0, cacheAdd(TEST_NETID, ce4)); |
| 595 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_FOUND, TEST_NETID, ce4)); |
| 596 | EXPECT_TRUE(cacheLookup(RESOLV_CACHE_NOTFOUND, TEST_NETID, ce1)); |
| 597 | } |
| 598 | |
Mike Yu | c7649d1 | 2019-05-22 15:28:07 +0800 | [diff] [blame] | 599 | TEST_F(ResolvCacheTest, ResolverSetup) { |
| 600 | const SetupParams setup = { |
| 601 | .servers = {"127.0.0.1", "::127.0.0.2", "fe80::3"}, |
| 602 | .domains = {"domain1.com", "domain2.com"}, |
| 603 | .params = kParams, |
| 604 | }; |
| 605 | |
| 606 | // Failed to setup resolver because of the cache not created. |
| 607 | EXPECT_EQ(-ENONET, cacheSetupResolver(TEST_NETID, setup)); |
| 608 | EXPECT_FALSE(resolv_has_nameservers(TEST_NETID)); |
| 609 | |
| 610 | // The cache is created now. |
| 611 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 612 | EXPECT_EQ(0, cacheSetupResolver(TEST_NETID, setup)); |
| 613 | EXPECT_TRUE(resolv_has_nameservers(TEST_NETID)); |
| 614 | } |
| 615 | |
| 616 | TEST_F(ResolvCacheTest, ResolverSetup_InvalidNameServers) { |
| 617 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 618 | const std::string invalidServers[]{ |
| 619 | "127.A.b.1", |
| 620 | "127.^.0", |
| 621 | "::^:1", |
| 622 | "", |
| 623 | }; |
| 624 | SetupParams setup = { |
| 625 | .servers = {}, |
| 626 | .domains = {"domain1.com"}, |
| 627 | .params = kParams, |
| 628 | }; |
| 629 | |
| 630 | // Failed to setup resolver because of invalid name servers. |
| 631 | for (const auto& server : invalidServers) { |
| 632 | SCOPED_TRACE(server); |
| 633 | setup.servers = {"127.0.0.1", server, "127.0.0.2"}; |
| 634 | EXPECT_EQ(-EINVAL, cacheSetupResolver(TEST_NETID, setup)); |
| 635 | EXPECT_FALSE(resolv_has_nameservers(TEST_NETID)); |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | TEST_F(ResolvCacheTest, ResolverSetup_DropDomain) { |
| 640 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 641 | |
| 642 | // Setup with one domain which is too long. |
| 643 | const std::vector<std::string> servers = {"127.0.0.1", "fe80::1"}; |
| 644 | const std::string domainTooLong(MAXDNSRCHPATH, '1'); |
| 645 | const std::string validDomain1(MAXDNSRCHPATH - 1, '2'); |
| 646 | const std::string validDomain2(MAXDNSRCHPATH - 1, '3'); |
| 647 | SetupParams setup = { |
| 648 | .servers = servers, |
| 649 | .domains = {}, |
| 650 | .params = kParams, |
| 651 | }; |
| 652 | CacheStats expect = { |
| 653 | .setup = setup, |
| 654 | .stats = {}, |
| 655 | .pendingReqTimeoutCount = 0, |
| 656 | }; |
| 657 | |
| 658 | // Overlength domains are dropped. |
| 659 | setup.domains = {validDomain1, domainTooLong, validDomain2}; |
| 660 | expect.setup.domains = {validDomain1, validDomain2}; |
| 661 | EXPECT_EQ(0, cacheSetupResolver(TEST_NETID, setup)); |
| 662 | EXPECT_TRUE(resolv_has_nameservers(TEST_NETID)); |
| 663 | expectCacheStats("ResolverSetup_Domains drop overlength", TEST_NETID, expect); |
| 664 | |
| 665 | // Duplicate domains are dropped. |
| 666 | setup.domains = {validDomain1, validDomain2, validDomain1, validDomain2}; |
| 667 | expect.setup.domains = {validDomain1, validDomain2}; |
| 668 | EXPECT_EQ(0, cacheSetupResolver(TEST_NETID, setup)); |
| 669 | EXPECT_TRUE(resolv_has_nameservers(TEST_NETID)); |
| 670 | expectCacheStats("ResolverSetup_Domains drop duplicates", TEST_NETID, expect); |
| 671 | } |
| 672 | |
| 673 | TEST_F(ResolvCacheTest, ResolverSetup_Prune) { |
| 674 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 675 | const std::vector<std::string> servers = {"127.0.0.1", "::127.0.0.2", "fe80::1", "fe80::2", |
| 676 | "fe80::3"}; |
| 677 | const std::vector<std::string> domains = {"d1.com", "d2.com", "d3.com", "d4.com", |
| 678 | "d5.com", "d6.com", "d7.com"}; |
| 679 | const SetupParams setup = { |
| 680 | .servers = servers, |
| 681 | .domains = domains, |
| 682 | .params = kParams, |
| 683 | }; |
| 684 | |
| 685 | EXPECT_EQ(0, cacheSetupResolver(TEST_NETID, setup)); |
| 686 | EXPECT_TRUE(resolv_has_nameservers(TEST_NETID)); |
| 687 | |
| 688 | const CacheStats cacheStats = { |
| 689 | .setup = {.servers = std::vector(servers.begin(), servers.begin() + MAXNS), |
| 690 | .domains = std::vector(domains.begin(), domains.begin() + MAXDNSRCH), |
| 691 | .params = setup.params}, |
| 692 | .stats = {}, |
| 693 | .pendingReqTimeoutCount = 0, |
| 694 | }; |
| 695 | expectCacheStats("ResolverSetup_Prune", TEST_NETID, cacheStats); |
| 696 | } |
| 697 | |
| 698 | TEST_F(ResolvCacheTest, GetStats) { |
| 699 | EXPECT_EQ(0, cacheCreate(TEST_NETID)); |
| 700 | const SetupParams setup = { |
| 701 | .servers = {"127.0.0.1", "::127.0.0.2", "fe80::3"}, |
| 702 | .domains = {"domain1.com", "domain2.com"}, |
| 703 | .params = kParams, |
| 704 | }; |
| 705 | |
| 706 | EXPECT_EQ(0, cacheSetupResolver(TEST_NETID, setup)); |
| 707 | EXPECT_TRUE(resolv_has_nameservers(TEST_NETID)); |
| 708 | |
| 709 | const CacheStats cacheStats = { |
| 710 | .setup = setup, |
| 711 | .stats = {}, |
| 712 | .pendingReqTimeoutCount = 0, |
| 713 | }; |
| 714 | expectCacheStats("GetStats", TEST_NETID, cacheStats); |
| 715 | } |
| 716 | |
Luke Huang | e126fbe | 2019-07-20 17:36:30 +0800 | [diff] [blame] | 717 | namespace { |
| 718 | |
| 719 | constexpr int EAI_OK = 0; |
| 720 | constexpr char DNS_EVENT_SUBSAMPLING_MAP_FLAG[] = |
| 721 | "persist.device_config.netd_native.dns_event_subsample_map"; |
| 722 | |
| 723 | class ScopedCacheCreate { |
| 724 | public: |
| 725 | explicit ScopedCacheCreate(unsigned netid, const char* subsampling_map, |
| 726 | const char* property = DNS_EVENT_SUBSAMPLING_MAP_FLAG) |
| 727 | : mStoredNetId(netid), mStoredProperty(property) { |
| 728 | property_get(property, mStoredMap, ""); |
| 729 | property_set(property, subsampling_map); |
| 730 | EXPECT_EQ(0, resolv_create_cache_for_net(netid)); |
| 731 | } |
| 732 | ~ScopedCacheCreate() { |
| 733 | resolv_delete_cache_for_net(mStoredNetId); |
| 734 | property_set(mStoredProperty, mStoredMap); |
| 735 | } |
| 736 | |
| 737 | private: |
| 738 | unsigned mStoredNetId; |
| 739 | const char* mStoredProperty; |
| 740 | char mStoredMap[PROPERTY_VALUE_MAX]{}; |
| 741 | }; |
| 742 | |
| 743 | } // namespace |
| 744 | |
| 745 | TEST_F(ResolvCacheTest, DnsEventSubsampling) { |
| 746 | // Test defaults, default flag is "default:1 0:100 7:10" if no experiment flag is set |
| 747 | { |
| 748 | ScopedCacheCreate scopedCacheCreate(TEST_NETID, ""); |
| 749 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_NODATA), 10U); |
| 750 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_OK), 100U); |
| 751 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_BADFLAGS), |
| 752 | 1U); // default |
| 753 | EXPECT_THAT(resolv_cache_dump_subsampling_map(TEST_NETID), |
| 754 | testing::UnorderedElementsAreArray({"default:1", "0:100", "7:10"})); |
| 755 | } |
| 756 | // Now change the experiment flag to "0:42 default:666" |
| 757 | { |
| 758 | ScopedCacheCreate scopedCacheCreate(TEST_NETID, "0:42 default:666"); |
| 759 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_OK), 42U); |
| 760 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_NODATA), |
| 761 | 666U); // default |
| 762 | EXPECT_THAT(resolv_cache_dump_subsampling_map(TEST_NETID), |
| 763 | testing::UnorderedElementsAreArray({"default:666", "0:42"})); |
| 764 | } |
| 765 | // Now change the experiment flag to something illegal |
| 766 | { |
| 767 | ScopedCacheCreate scopedCacheCreate(TEST_NETID, "asvaxx"); |
| 768 | // 0(disable log) is the default value if experiment flag is invalid. |
| 769 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_OK), 0U); |
| 770 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_NODATA), 0U); |
| 771 | EXPECT_TRUE(resolv_cache_dump_subsampling_map(TEST_NETID).empty()); |
| 772 | } |
| 773 | // Test negative and zero denom |
| 774 | { |
| 775 | ScopedCacheCreate scopedCacheCreate(TEST_NETID, "0:-42 default:-666 7:10 10:0"); |
| 776 | // 0(disable log) is the default value if no valid denom is set |
| 777 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_OK), 0U); |
| 778 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_BADFLAGS), 0U); |
| 779 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_NODATA), 10U); |
| 780 | EXPECT_EQ(resolv_cache_get_subsampling_denom(TEST_NETID, EAI_SOCKTYPE), 0U); |
| 781 | EXPECT_THAT(resolv_cache_dump_subsampling_map(TEST_NETID), |
| 782 | testing::UnorderedElementsAreArray({"7:10", "10:0"})); |
| 783 | } |
| 784 | } |
| 785 | |
Mike Yu | d1ec254 | 2019-06-06 17:17:53 +0800 | [diff] [blame] | 786 | // TODO: Tests for struct resolv_cache_info, including: |
| 787 | // - res_params |
| 788 | // -- resolv_cache_get_resolver_stats() |
| 789 | // - res_stats |
| 790 | // -- _resolv_cache_add_resolver_stats_sample() |
| 791 | // -- android_net_res_stats_get_info_for_net() |
| 792 | // TODO: inject a mock timer into the cache to make TTL tests pass instantly |
| 793 | // TODO: test TTL of RFC 2308 negative caching |