1 //
2 //
3 // Copyright 2016 gRPC authors.
4 //
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 //
17 //
18
19 #include <net/if.h>
20 #include <string.h>
21 #include <sys/un.h>
22
23 #include <string>
24
25 #include <gtest/gtest.h>
26
27 #include "absl/flags/flag.h"
28 #include "absl/flags/parse.h"
29 #include "absl/strings/str_format.h"
30
31 #include <grpc/grpc.h>
32 #include <grpc/support/alloc.h>
33 #include <grpc/support/log.h>
34 #include <grpc/support/sync.h>
35 #include <grpc/support/time.h>
36
37 #include "src/core/lib/config/config_vars.h"
38 #include "src/core/lib/gpr/string.h"
39 #include "src/core/lib/gpr/useful.h"
40 #include "src/core/lib/gprpp/crash.h"
41 #include "src/core/lib/gprpp/env.h"
42 #include "src/core/lib/gprpp/thd.h"
43 #include "src/core/lib/gprpp/time.h"
44 #include "src/core/lib/iomgr/executor.h"
45 #include "src/core/lib/iomgr/iomgr.h"
46 #include "src/core/lib/iomgr/pollset.h"
47 #include "src/core/lib/iomgr/resolve_address.h"
48 #include "test/core/util/cmdline.h"
49 #include "test/core/util/test_config.h"
50
test_deadline(void)51 static gpr_timespec test_deadline(void) {
52 return grpc_timeout_seconds_to_deadline(100);
53 }
54
55 typedef struct args_struct {
56 grpc_core::Thread thd;
57 gpr_event ev;
58 gpr_mu* mu;
59 bool done; // guarded by mu
60 grpc_pollset* pollset; // guarded by mu
61 grpc_pollset_set* pollset_set;
62 } args_struct;
63
do_nothing(void *,grpc_error_handle)64 static void do_nothing(void* /*arg*/, grpc_error_handle /*error*/) {}
65
args_init(args_struct * args)66 void args_init(args_struct* args) {
67 gpr_event_init(&args->ev);
68 args->pollset = static_cast<grpc_pollset*>(gpr_zalloc(grpc_pollset_size()));
69 grpc_pollset_init(args->pollset, &args->mu);
70 args->pollset_set = grpc_pollset_set_create();
71 grpc_pollset_set_add_pollset(args->pollset_set, args->pollset);
72 args->done = false;
73 }
74
args_finish(args_struct * args)75 void args_finish(args_struct* args) {
76 ASSERT_TRUE(gpr_event_wait(&args->ev, test_deadline()));
77 args->thd.Join();
78 // Don't need to explicitly destruct args->thd since
79 // args is actually going to be destructed, not just freed
80 grpc_pollset_set_del_pollset(args->pollset_set, args->pollset);
81 grpc_pollset_set_destroy(args->pollset_set);
82 grpc_closure do_nothing_cb;
83 GRPC_CLOSURE_INIT(&do_nothing_cb, do_nothing, nullptr,
84 grpc_schedule_on_exec_ctx);
85 grpc_pollset_shutdown(args->pollset, &do_nothing_cb);
86 // exec_ctx needs to be flushed before calling grpc_pollset_destroy()
87 grpc_core::ExecCtx::Get()->Flush();
88 grpc_pollset_destroy(args->pollset);
89 gpr_free(args->pollset);
90 }
91
n_sec_deadline(int seconds)92 static grpc_core::Timestamp n_sec_deadline(int seconds) {
93 return grpc_core::Timestamp::FromTimespecRoundUp(
94 grpc_timeout_seconds_to_deadline(seconds));
95 }
96
actually_poll(void * argsp)97 static void actually_poll(void* argsp) {
98 args_struct* args = static_cast<args_struct*>(argsp);
99 grpc_core::Timestamp deadline = n_sec_deadline(10);
100 while (true) {
101 grpc_core::ExecCtx exec_ctx;
102 {
103 grpc_core::MutexLockForGprMu lock(args->mu);
104 if (args->done) {
105 break;
106 }
107 grpc_core::Duration time_left = deadline - grpc_core::Timestamp::Now();
108 gpr_log(GPR_DEBUG, "done=%d, time_left=%" PRId64, args->done,
109 time_left.millis());
110 ASSERT_GE(time_left, grpc_core::Duration::Zero());
111 grpc_pollset_worker* worker = nullptr;
112 GRPC_LOG_IF_ERROR(
113 "pollset_work",
114 grpc_pollset_work(args->pollset, &worker, n_sec_deadline(1)));
115 }
116 }
117 gpr_event_set(&args->ev, reinterpret_cast<void*>(1));
118 }
119
poll_pollset_until_request_done(args_struct * args)120 static void poll_pollset_until_request_done(args_struct* args) {
121 args->thd = grpc_core::Thread("grpc_poll_pollset", actually_poll, args);
122 args->thd.Start();
123 }
124
125 namespace {
126
MustSucceed(args_struct * args,absl::StatusOr<std::vector<grpc_resolved_address>> result)127 void MustSucceed(args_struct* args,
128 absl::StatusOr<std::vector<grpc_resolved_address>> result) {
129 ASSERT_TRUE(result.ok());
130 ASSERT_FALSE(result->empty());
131 grpc_core::MutexLockForGprMu lock(args->mu);
132 args->done = true;
133 GRPC_LOG_IF_ERROR("pollset_kick", grpc_pollset_kick(args->pollset, nullptr));
134 }
135
136 } // namespace
137
resolve_address_must_succeed(const char * target)138 static void resolve_address_must_succeed(const char* target) {
139 grpc_core::ExecCtx exec_ctx;
140 args_struct args;
141 args_init(&args);
142 poll_pollset_until_request_done(&args);
143 grpc_core::GetDNSResolver()->LookupHostname(
144 [&args](absl::StatusOr<std::vector<grpc_resolved_address>> result) {
145 MustSucceed(&args, std::move(result));
146 },
147 target, /*port number=*/"1", grpc_core::kDefaultDNSRequestTimeout,
148 args.pollset_set,
149 /*name_server=*/"");
150 grpc_core::ExecCtx::Get()->Flush();
151 args_finish(&args);
152 }
153
test_named_and_numeric_scope_ids(void)154 static void test_named_and_numeric_scope_ids(void) {
155 char* arbitrary_interface_name = static_cast<char*>(gpr_zalloc(IF_NAMESIZE));
156 int interface_index = 0;
157 // Probe candidate interface index numbers until we find one that the
158 // system recognizes, and then use that for the test.
159 for (size_t i = 1; i < 65536; i++) {
160 if (if_indextoname(i, arbitrary_interface_name) != nullptr) {
161 gpr_log(GPR_DEBUG,
162 "Found interface at index %" PRIuPTR
163 " named %s. Will use this for the test",
164 i, arbitrary_interface_name);
165 interface_index = static_cast<int>(i);
166 break;
167 }
168 }
169 ASSERT_GT(strlen(arbitrary_interface_name), 0);
170 // Test resolution of an ipv6 address with a named scope ID
171 gpr_log(GPR_DEBUG, "test resolution with a named scope ID");
172 std::string target_with_named_scope_id =
173 absl::StrFormat("fe80::1234%%%s", arbitrary_interface_name);
174 resolve_address_must_succeed(target_with_named_scope_id.c_str());
175 gpr_free(arbitrary_interface_name);
176 // Test resolution of an ipv6 address with a numeric scope ID
177 gpr_log(GPR_DEBUG, "test resolution with a numeric scope ID");
178 std::string target_with_numeric_scope_id =
179 absl::StrFormat("fe80::1234%%%d", interface_index);
180 resolve_address_must_succeed(target_with_numeric_scope_id.c_str());
181 }
182
183 ABSL_FLAG(std::string, resolver, "", "Resolver type (ares or native)");
184
TEST(ResolveAddressUsingAresResolverPosixTest,MainTest)185 TEST(ResolveAddressUsingAresResolverPosixTest, MainTest) {
186 // First set the resolver type based off of --resolver
187 std::string resolver_type = absl::GetFlag(FLAGS_resolver);
188 // In case that there are more than one argument on the command line,
189 // --resolver will always be the first one, so only parse the first argument
190 // (other arguments may be unknown to cl)
191 grpc_core::ConfigVars::Overrides overrides;
192 if (resolver_type == "native") {
193 overrides.dns_resolver = "native";
194 } else if (resolver_type == "ares") {
195 overrides.dns_resolver = "ares";
196 } else {
197 gpr_log(GPR_ERROR, "--resolver was not set to ares or native");
198 ASSERT_TRUE(false);
199 }
200 grpc_core::ConfigVars::SetOverrides(overrides);
201
202 grpc_init();
203 {
204 grpc_core::ExecCtx exec_ctx;
205 test_named_and_numeric_scope_ids();
206 }
207 grpc_shutdown();
208 }
209
main(int argc,char ** argv)210 int main(int argc, char** argv) {
211 grpc::testing::TestEnvironment env(&argc, argv);
212 ::testing::InitGoogleTest(&argc, argv);
213 absl::ParseCommandLine(argc, argv);
214 return RUN_ALL_TESTS();
215 }
216