| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless requied by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include <arpa/inet.h> |
| #include <errno.h> |
| #include <netdb.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| #include <cutils/sockets.h> |
| #include <android-base/stringprintf.h> |
| #include <private/android_filesystem_config.h> |
| |
| #include <thread> |
| |
| #include "NetdClient.h" |
| |
| #include <gtest/gtest.h> |
| #define LOG_TAG "resolverTest" |
| #include <utils/Log.h> |
| #include <testUtil.h> |
| |
| #include "dns_responder.h" |
| #include "resolv_params.h" |
| |
| using android::base::StringPrintf; |
| using android::base::StringAppendF; |
| |
| // TODO: make this dynamic and stop depending on implementation details. |
| #define TEST_OEM_NETWORK "oem29" |
| #define TEST_NETID 30 |
| |
| // The only response code used in this test, see |
| // frameworks/base/services/java/com/android/server/NetworkManagementService.java |
| // for others. |
| static constexpr int ResponseCodeOK = 200; |
| |
| // Returns ResponseCode. |
| int netdCommand(const char* sockname, const char* command) { |
| int sock = socket_local_client(sockname, |
| ANDROID_SOCKET_NAMESPACE_RESERVED, |
| SOCK_STREAM); |
| if (sock < 0) { |
| perror("Error connecting"); |
| return -1; |
| } |
| |
| // FrameworkListener expects the whole command in one read. |
| char buffer[256]; |
| int nwritten = snprintf(buffer, sizeof(buffer), "0 %s", command); |
| if (write(sock, buffer, nwritten + 1) < 0) { |
| perror("Error sending netd command"); |
| close(sock); |
| return -1; |
| } |
| |
| int nread = read(sock, buffer, sizeof(buffer)); |
| if (nread < 0) { |
| perror("Error reading response"); |
| close(sock); |
| return -1; |
| } |
| close(sock); |
| return atoi(buffer); |
| } |
| |
| |
| bool expectNetdResult(int expected, const char* sockname, const char* format, ...) { |
| char command[256]; |
| va_list args; |
| va_start(args, format); |
| vsnprintf(command, sizeof(command), format, args); |
| va_end(args); |
| int result = netdCommand(sockname, command); |
| EXPECT_EQ(expected, result) << command; |
| return (200 <= expected && expected < 300); |
| } |
| |
| |
| class ResolverTest : public ::testing::Test { |
| protected: |
| virtual void SetUp() { |
| // Ensure resolutions go via proxy. |
| setenv("ANDROID_DNS_MODE", "", 1); |
| uid = getuid(); |
| pid = getpid(); |
| SetupOemNetwork(); |
| } |
| |
| virtual void TearDown() { |
| TearDownOemNetwork(); |
| netdCommand("netd", "network destroy " TEST_OEM_NETWORK); |
| } |
| |
| void SetupOemNetwork() { |
| netdCommand("netd", "network destroy " TEST_OEM_NETWORK); |
| if (expectNetdResult(ResponseCodeOK, "netd", |
| "network create %s", TEST_OEM_NETWORK)) { |
| oemNetId = TEST_NETID; |
| } |
| setNetworkForProcess(oemNetId); |
| ASSERT_EQ((unsigned) oemNetId, getNetworkForProcess()); |
| } |
| |
| void TearDownOemNetwork() { |
| if (oemNetId != -1) { |
| expectNetdResult(ResponseCodeOK, "netd", |
| "network destroy %s", TEST_OEM_NETWORK); |
| } |
| } |
| |
| bool SetResolversForNetwork(const std::vector<std::string>& searchDomains, |
| const std::vector<std::string>& servers, const std::string& params) { |
| // No use case for empty domains / servers (yet). |
| if (searchDomains.empty() || servers.empty()) return false; |
| |
| std::string cmd = StringPrintf("resolver setnetdns %d \"%s", oemNetId, |
| searchDomains[0].c_str()); |
| for (size_t i = 1 ; i < searchDomains.size() ; ++i) { |
| cmd += " "; |
| cmd += searchDomains[i]; |
| } |
| cmd += "\" "; |
| |
| cmd += servers[0]; |
| for (size_t i = 1 ; i < servers.size() ; ++i) { |
| cmd += " "; |
| cmd += servers[i]; |
| } |
| |
| if (!params.empty()) { |
| cmd += " --params \""; |
| cmd += params; |
| cmd += "\""; |
| } |
| |
| int rv = netdCommand("netd", cmd.c_str()); |
| std::cout << "command: '" << cmd << "', rv = " << rv << "\n"; |
| if (rv != ResponseCodeOK) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool FlushCache() const { |
| return expectNetdResult(ResponseCodeOK, "netd", "resolver flushnet %d", oemNetId); |
| } |
| |
| std::string ToString(const hostent* he) const { |
| if (he == nullptr) return "<null>"; |
| char buffer[INET6_ADDRSTRLEN]; |
| if (!inet_ntop(he->h_addrtype, he->h_addr_list[0], buffer, sizeof(buffer))) { |
| return "<invalid>"; |
| } |
| return buffer; |
| } |
| |
| std::string ToString(const addrinfo* ai) const { |
| if (!ai) |
| return "<null>"; |
| for (const auto* aip = ai ; aip != nullptr ; aip = aip->ai_next) { |
| char host[NI_MAXHOST]; |
| int rv = getnameinfo(aip->ai_addr, aip->ai_addrlen, host, sizeof(host), nullptr, 0, |
| NI_NUMERICHOST); |
| if (rv != 0) |
| return gai_strerror(rv); |
| return host; |
| } |
| return "<invalid>"; |
| } |
| |
| size_t GetNumQueries(const test::DNSResponder& dns, const char* name) const { |
| auto queries = dns.queries(); |
| size_t found = 0; |
| for (const auto& p : queries) { |
| std::cout << "query " << p.first << "\n"; |
| if (p.first == name) { |
| ++found; |
| } |
| } |
| return found; |
| } |
| |
| size_t GetNumQueriesForType(const test::DNSResponder& dns, ns_type type, |
| const char* name) const { |
| auto queries = dns.queries(); |
| size_t found = 0; |
| for (const auto& p : queries) { |
| std::cout << "query " << p.first << "\n"; |
| if (p.second == type && p.first == name) { |
| ++found; |
| } |
| } |
| return found; |
| } |
| |
| int pid; |
| int uid; |
| int oemNetId = -1; |
| const std::vector<std::string> mDefaultSearchDomains = { "example.com" }; |
| // <sample validity in s> <success threshold in percent> <min samples> <max samples> |
| const std::string mDefaultParams = "300 25 8 8"; |
| }; |
| |
| TEST_F(ResolverTest, GetHostByName) { |
| const char* listen_addr = "127.0.0.3"; |
| const char* listen_srv = "53"; |
| const char* host_name = "hello.example.com."; |
| test::DNSResponder dns(listen_addr, listen_srv, 250, ns_rcode::ns_r_servfail, 1.0); |
| dns.addMapping(host_name, ns_type::ns_t_a, "1.2.3.3"); |
| ASSERT_TRUE(dns.startServer()); |
| std::vector<std::string> servers = { listen_addr }; |
| ASSERT_TRUE(SetResolversForNetwork(mDefaultSearchDomains, servers, mDefaultParams)); |
| |
| dns.clearQueries(); |
| const hostent* result = gethostbyname("hello"); |
| EXPECT_EQ(1U, GetNumQueriesForType(dns, ns_type::ns_t_a, host_name)); |
| ASSERT_FALSE(result == nullptr); |
| ASSERT_EQ(4, result->h_length); |
| ASSERT_FALSE(result->h_addr_list[0] == nullptr); |
| EXPECT_EQ("1.2.3.3", ToString(result)); |
| EXPECT_TRUE(result->h_addr_list[1] == nullptr); |
| dns.stopServer(); |
| } |
| |
| TEST_F(ResolverTest, GetAddrInfo) { |
| addrinfo* result = nullptr; |
| |
| const char* listen_addr = "127.0.0.4"; |
| const char* listen_srv = "53"; |
| const char* host_name = "howdie.example.com."; |
| test::DNSResponder dns(listen_addr, listen_srv, 250, |
| ns_rcode::ns_r_servfail, 1.0); |
| dns.addMapping(host_name, ns_type::ns_t_a, "1.2.3.4"); |
| dns.addMapping(host_name, ns_type::ns_t_aaaa, "::1.2.3.4"); |
| ASSERT_TRUE(dns.startServer()); |
| std::vector<std::string> servers = { listen_addr }; |
| ASSERT_TRUE(SetResolversForNetwork(mDefaultSearchDomains, servers, mDefaultParams)); |
| |
| dns.clearQueries(); |
| EXPECT_EQ(0, getaddrinfo("howdie", nullptr, nullptr, &result)); |
| size_t found = GetNumQueries(dns, host_name); |
| EXPECT_LE(1U, found); |
| // Could be A or AAAA |
| std::string result_str = ToString(result); |
| EXPECT_TRUE(result_str == "1.2.3.4" || result_str == "::1.2.3.4") |
| << ", result_str='" << result_str << "'"; |
| if (result) freeaddrinfo(result); |
| result = nullptr; |
| |
| // Verify that it's cached. |
| size_t old_found = found; |
| EXPECT_EQ(0, getaddrinfo("howdie", nullptr, nullptr, &result)); |
| found = GetNumQueries(dns, host_name); |
| EXPECT_LE(1U, found); |
| EXPECT_EQ(old_found, found); |
| result_str = ToString(result); |
| EXPECT_TRUE(result_str == "1.2.3.4" || result_str == "::1.2.3.4") |
| << result_str; |
| if (result) freeaddrinfo(result); |
| result = nullptr; |
| |
| // Verify that cache can be flushed. |
| dns.clearQueries(); |
| ASSERT_TRUE(FlushCache()); |
| dns.addMapping(host_name, ns_type::ns_t_a, "1.2.3.44"); |
| dns.addMapping(host_name, ns_type::ns_t_aaaa, "::1.2.3.44"); |
| |
| EXPECT_EQ(0, getaddrinfo("howdie", nullptr, nullptr, &result)); |
| EXPECT_LE(1U, GetNumQueries(dns, host_name)); |
| // Could be A or AAAA |
| result_str = ToString(result); |
| EXPECT_TRUE(result_str == "1.2.3.44" || result_str == "::1.2.3.44") |
| << ", result_str='" << result_str << "'"; |
| if (result) freeaddrinfo(result); |
| } |
| |
| TEST_F(ResolverTest, GetAddrInfoV4) { |
| addrinfo* result = nullptr; |
| |
| const char* listen_addr = "127.0.0.5"; |
| const char* listen_srv = "53"; |
| const char* host_name = "hola.example.com."; |
| test::DNSResponder dns(listen_addr, listen_srv, 250, |
| ns_rcode::ns_r_servfail, 1.0); |
| dns.addMapping(host_name, ns_type::ns_t_a, "1.2.3.5"); |
| ASSERT_TRUE(dns.startServer()); |
| std::vector<std::string> servers = { listen_addr }; |
| ASSERT_TRUE(SetResolversForNetwork(mDefaultSearchDomains, servers, mDefaultParams)); |
| |
| addrinfo hints; |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = AF_INET; |
| EXPECT_EQ(0, getaddrinfo("hola", nullptr, &hints, &result)); |
| EXPECT_EQ(1U, GetNumQueries(dns, host_name)); |
| EXPECT_EQ("1.2.3.5", ToString(result)); |
| if (result) freeaddrinfo(result); |
| } |
| |
| TEST_F(ResolverTest, MultidomainResolution) { |
| std::vector<std::string> searchDomains = { "example1.com", "example2.com", "example3.com" }; |
| const char* listen_addr = "127.0.0.6"; |
| const char* listen_srv = "53"; |
| const char* host_name = "nihao.example2.com."; |
| test::DNSResponder dns(listen_addr, listen_srv, 250, |
| ns_rcode::ns_r_servfail, 1.0); |
| dns.addMapping(host_name, ns_type::ns_t_a, "1.2.3.3"); |
| ASSERT_TRUE(dns.startServer()); |
| std::vector<std::string> servers = { listen_addr }; |
| ASSERT_TRUE(SetResolversForNetwork(searchDomains, servers, mDefaultParams)); |
| |
| dns.clearQueries(); |
| const hostent* result = gethostbyname("nihao"); |
| EXPECT_EQ(1U, GetNumQueriesForType(dns, ns_type::ns_t_a, host_name)); |
| ASSERT_FALSE(result == nullptr); |
| ASSERT_EQ(4, result->h_length); |
| ASSERT_FALSE(result->h_addr_list[0] == nullptr); |
| EXPECT_EQ("1.2.3.3", ToString(result)); |
| EXPECT_TRUE(result->h_addr_list[1] == nullptr); |
| dns.stopServer(); |
| } |
| |
| TEST_F(ResolverTest, GetAddrInfoV6_failing) { |
| addrinfo* result = nullptr; |
| |
| const char* listen_addr0 = "127.0.0.7"; |
| const char* listen_addr1 = "127.0.0.8"; |
| const char* listen_srv = "53"; |
| const char* host_name = "ohayou.example.com."; |
| test::DNSResponder dns0(listen_addr0, listen_srv, 250, |
| ns_rcode::ns_r_servfail, 0.0); |
| test::DNSResponder dns1(listen_addr1, listen_srv, 250, |
| ns_rcode::ns_r_servfail, 1.0); |
| dns0.addMapping(host_name, ns_type::ns_t_aaaa, "2001:db8::5"); |
| dns1.addMapping(host_name, ns_type::ns_t_aaaa, "2001:db8::6"); |
| ASSERT_TRUE(dns0.startServer()); |
| ASSERT_TRUE(dns1.startServer()); |
| std::vector<std::string> servers = { listen_addr0, listen_addr1 }; |
| // <sample validity in s> <success threshold in percent> <min samples> <max samples> |
| unsigned sample_validity = 300; |
| int success_threshold = 25; |
| int sample_count = 8; |
| std::string params = StringPrintf("%u %d %d %d", sample_validity, success_threshold, |
| sample_count, sample_count); |
| ASSERT_TRUE(SetResolversForNetwork(mDefaultSearchDomains, servers, params)); |
| |
| // Repeatedly perform resolutions for non-existing domains until MAXNSSAMPLES resolutions have |
| // reached the dns0, which is set to fail. No more requests should then arrive at that server |
| // for the next sample_lifetime seconds. |
| // TODO: This approach is implementation-dependent, change once metrics reporting is available. |
| addrinfo hints; |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = AF_INET6; |
| for (int i = 0 ; i < sample_count ; ++i) { |
| std::string domain = StringPrintf("nonexistent%d", i); |
| getaddrinfo(domain.c_str(), nullptr, &hints, &result); |
| } |
| // Due to 100% errors for all possible samples, the server should be ignored from now on and |
| // only the second one used for all following queries, until NSSAMPLE_VALIDITY is reached. |
| dns0.clearQueries(); |
| dns1.clearQueries(); |
| EXPECT_EQ(0, getaddrinfo("ohayou", nullptr, &hints, &result)); |
| EXPECT_EQ(0U, GetNumQueries(dns0, host_name)); |
| EXPECT_EQ(1U, GetNumQueries(dns1, host_name)); |
| if (result) freeaddrinfo(result); |
| } |
| |
| TEST_F(ResolverTest, GetAddrInfoV6_concurrent) { |
| const char* listen_addr0 = "127.0.0.9"; |
| const char* listen_addr1 = "127.0.0.10"; |
| const char* listen_addr2 = "127.0.0.11"; |
| const char* listen_srv = "53"; |
| const char* host_name = "konbanha.example.com."; |
| test::DNSResponder dns0(listen_addr0, listen_srv, 250, |
| ns_rcode::ns_r_servfail, 1.0); |
| test::DNSResponder dns1(listen_addr1, listen_srv, 250, |
| ns_rcode::ns_r_servfail, 1.0); |
| test::DNSResponder dns2(listen_addr2, listen_srv, 250, |
| ns_rcode::ns_r_servfail, 1.0); |
| dns0.addMapping(host_name, ns_type::ns_t_aaaa, "2001:db8::5"); |
| dns1.addMapping(host_name, ns_type::ns_t_aaaa, "2001:db8::6"); |
| dns2.addMapping(host_name, ns_type::ns_t_aaaa, "2001:db8::7"); |
| ASSERT_TRUE(dns0.startServer()); |
| ASSERT_TRUE(dns1.startServer()); |
| ASSERT_TRUE(dns2.startServer()); |
| const std::vector<std::string> servers = { listen_addr0, listen_addr1, listen_addr2 }; |
| std::vector<std::thread> threads(10); |
| for (std::thread& thread : threads) { |
| thread = std::thread([this, &servers, &dns0, &dns1, &dns2]() { |
| unsigned delay = arc4random_uniform(1*1000*1000); // <= 1s |
| usleep(delay); |
| std::vector<std::string> serverSubset; |
| for (const auto& server : servers) { |
| if (arc4random_uniform(2)) { |
| serverSubset.push_back(server); |
| } |
| } |
| if (serverSubset.empty()) serverSubset = servers; |
| ASSERT_TRUE(SetResolversForNetwork(mDefaultSearchDomains, serverSubset, |
| mDefaultParams)); |
| addrinfo hints; |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = AF_INET6; |
| addrinfo* result = nullptr; |
| int rv = getaddrinfo("konbanha", nullptr, &hints, &result); |
| EXPECT_EQ(0, rv) << "error [" << rv << "] " << gai_strerror(rv); |
| }); |
| } |
| for (std::thread& thread : threads) { |
| thread.join(); |
| } |
| } |
| |
| TEST_F(ResolverTest, SearchPathChange) { |
| addrinfo* result = nullptr; |
| |
| const char* listen_addr = "127.0.0.13"; |
| const char* listen_srv = "53"; |
| const char* host_name1 = "test13.domain1.org."; |
| const char* host_name2 = "test13.domain2.org."; |
| test::DNSResponder dns(listen_addr, listen_srv, 250, |
| ns_rcode::ns_r_servfail, 1.0); |
| dns.addMapping(host_name1, ns_type::ns_t_aaaa, "2001:db8::13"); |
| dns.addMapping(host_name2, ns_type::ns_t_aaaa, "2001:db8::1:13"); |
| ASSERT_TRUE(dns.startServer()); |
| std::vector<std::string> servers = { listen_addr }; |
| std::vector<std::string> domains = { "domain1.org" }; |
| ASSERT_TRUE(SetResolversForNetwork(domains, servers, mDefaultParams)); |
| |
| addrinfo hints; |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = AF_INET6; |
| EXPECT_EQ(0, getaddrinfo("test13", nullptr, &hints, &result)); |
| EXPECT_EQ(1U, dns.queries().size()); |
| EXPECT_EQ(1U, GetNumQueries(dns, host_name1)); |
| EXPECT_EQ("2001:db8::13", ToString(result)); |
| if (result) freeaddrinfo(result); |
| |
| // Test that changing the domain search path on its own works. |
| domains = { "domain2.org" }; |
| ASSERT_TRUE(SetResolversForNetwork(domains, servers, mDefaultParams)); |
| dns.clearQueries(); |
| |
| EXPECT_EQ(0, getaddrinfo("test13", nullptr, &hints, &result)); |
| EXPECT_EQ(1U, dns.queries().size()); |
| EXPECT_EQ(1U, GetNumQueries(dns, host_name2)); |
| EXPECT_EQ("2001:db8::1:13", ToString(result)); |
| if (result) freeaddrinfo(result); |
| } |