Merge "Fix wrong behavior of async DNS API with flags" (3f202e9a) · Commits · e / os / android_packages_modules_DnsResolver

res_cache.cpp

+3 −1

Original line number	Diff line number	Diff line
		@@ -1412,8 +1412,10 @@ ResolvCacheStatus _resolv_cache_lookup(unsigned netid, const void* query, int qu
		uint32_t flags) {
		// Skip cache lookup, return RESOLV_CACHE_NOTFOUND directly so that it is
		// possible to cache the answer of this query.
		// If ANDROID_RESOLV_NO_CACHE_STORE is set, return RESOLV_CACHE_SKIP to skip possible cache
		// storing.
		if (flags & ANDROID_RESOLV_NO_CACHE_LOOKUP) {
		return RESOLV_CACHE_NOTFOUND;
		return flags & ANDROID_RESOLV_NO_CACHE_STORE ? RESOLV_CACHE_SKIP : RESOLV_CACHE_NOTFOUND;
		}
		Entry key;
		Entry** lookup;

resolver_test.cpp

+34 −0

Original line number	Diff line number	Diff line
		@@ -2039,9 +2039,12 @@ TEST_F(ResolverTest, Async_MalformedQuery) {
		TEST_F(ResolverTest, Async_CacheFlags) {
		constexpr char listen_addr[] = "127.0.0.4";
		constexpr char host_name[] = "howdy.example.com.";
		constexpr char another_host_name[] = "howdy.example2.com.";
		const std::vector<DnsRecord> records = {
		{host_name, ns_type::ns_t_a, "1.2.3.4"},
		{host_name, ns_type::ns_t_aaaa, "::1.2.3.4"},
		{another_host_name, ns_type::ns_t_a, "1.2.3.5"},
		{another_host_name, ns_type::ns_t_aaaa, "::1.2.3.5"},
		};

		test::DNSResponder dns(listen_addr);
		@@ -2130,6 +2133,37 @@ TEST_F(ResolverTest, Async_CacheFlags) {

		// Cache hits, expect still 2 queries
		EXPECT_EQ(2U, GetNumQueries(dns, host_name));

		// Test both ANDROID_RESOLV_NO_CACHE_STORE and ANDROID_RESOLV_NO_CACHE_LOOKUP are set
		dns.clearQueries();

		// Make sure that the cache of "howdy.example2.com" exists.
		fd1 = resNetworkQuery(TEST_NETID, "howdy.example2.com", ns_c_in, ns_t_aaaa, 0);
		EXPECT_TRUE(fd1 != -1);
		expectAnswersValid(fd1, AF_INET6, "::1.2.3.5");
		EXPECT_EQ(1U, GetNumQueries(dns, another_host_name));

		// Re-query with testFlags
		const int testFlag = ANDROID_RESOLV_NO_CACHE_STORE \| ANDROID_RESOLV_NO_CACHE_LOOKUP;
		fd1 = resNetworkQuery(TEST_NETID, "howdy.example2.com", ns_c_in, ns_t_aaaa, testFlag);
		EXPECT_TRUE(fd1 != -1);
		expectAnswersValid(fd1, AF_INET6, "::1.2.3.5");
		// Expect cache lookup is skipped.
		EXPECT_EQ(2U, GetNumQueries(dns, another_host_name));

		// Do another query with testFlags
		fd1 = resNetworkQuery(TEST_NETID, "howdy.example2.com", ns_c_in, ns_t_a, testFlag);
		EXPECT_TRUE(fd1 != -1);
		expectAnswersValid(fd1, AF_INET, "1.2.3.5");
		// Expect cache lookup is skipped.
		EXPECT_EQ(3U, GetNumQueries(dns, another_host_name));

		// Re-query with no flags
		fd1 = resNetworkQuery(TEST_NETID, "howdy.example2.com", ns_c_in, ns_t_a, 0);
		EXPECT_TRUE(fd1 != -1);
		expectAnswersValid(fd1, AF_INET, "1.2.3.5");
		// Expect no cache hit because cache storing is also skipped in previous query.
		EXPECT_EQ(4U, GetNumQueries(dns, another_host_name));
		}

		TEST_F(ResolverTest, Async_NoRetryFlag) {