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// SPDX-License-Identifier: BSD-3-Clause
package org.xbill.DNS;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.spy;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.vertx.core.Future;
import io.vertx.core.Vertx;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.http.HttpMethod;
import io.vertx.core.http.HttpServer;
import io.vertx.core.http.HttpServerOptions;
import io.vertx.core.http.HttpVersion;
import io.vertx.junit5.Checkpoint;
import io.vertx.junit5.VertxExtension;
import io.vertx.junit5.VertxTestContext;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.time.Duration;
import java.util.Base64;
import java.util.Collections;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.condition.EnabledForJreRange;
import org.junit.jupiter.api.condition.JRE;
import org.junit.jupiter.api.extension.ExtendWith;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;
import org.mockito.stubbing.Answer;
@ExtendWith(VertxExtension.class)
@Slf4j
class DohResolverTest {
private final Name queryName = Name.fromConstantString("example.com.");
private final Record qr = Record.newRecord(queryName, Type.A, DClass.IN);
private final Message qm = Message.newQuery(qr);
private final Message a = new Message();
private boolean allRequestsUseTimeout = true;
@BeforeEach
void beforeEach() throws UnknownHostException {
Record ar =
new ARecord(
Name.fromConstantString("example.com."),
DClass.IN,
3600,
InetAddress.getByName("127.0.0.1"));
a.addRecord(qr, Section.QUESTION);
a.addRecord(ar, Section.ANSWER);
}
private DohResolver getResolver() {
return new DohResolver("http://localhost");
}
@ParameterizedTest
@ValueSource(booleans = {false, true})
void simpleResolve(boolean usePost, Vertx vertx, VertxTestContext context) {
DohResolver resolver = getResolver();
resolver.setUsePost(usePost);
setupResolverWithServer(resolver, Duration.ZERO, 200, 1, vertx, context)
.onSuccess(
server ->
Future.fromCompletionStage(resolver.sendAsync(qm))
.onComplete(
context.succeeding(
result ->
context.verify(
() -> {
assertEquals(Rcode.NOERROR, result.getHeader().getRcode());
assertEquals(0, result.getHeader().getID());
assertEquals(queryName, result.getQuestion().getName());
context.completeNow();
}))));
}
@ParameterizedTest
@ValueSource(booleans = {false, true})
void timeoutResolve(boolean usePost, Vertx vertx, VertxTestContext context) {
DohResolver resolver = getResolver();
resolver.setTimeout(Duration.ofSeconds(1));
resolver.setUsePost(usePost);
setupResolverWithServer(resolver, Duration.ofSeconds(5), 200, 1, vertx, context)
.onSuccess(
server ->
Future.fromCompletionStage(resolver.sendAsync(qm))
.onComplete(
context.failing(
ex ->
context.verify(
() -> {
assertTrue(
ex.getCause() instanceof TimeoutException
|| ex.getMessage().contains("timed out"));
context.completeNow();
}))));
}
@ParameterizedTest
@ValueSource(booleans = {false, true})
void servfailResolve(boolean usePost, Vertx vertx, VertxTestContext context) {
DohResolver resolver = getResolver();
resolver.setUsePost(usePost);
setupResolverWithServer(resolver, Duration.ZERO, 301, 1, vertx, context)
.onSuccess(
server ->
Future.fromCompletionStage(resolver.sendAsync(qm))
.onComplete(
context.succeeding(
result ->
context.verify(
() -> {
assertEquals(Rcode.SERVFAIL, result.getHeader().getRcode());
context.completeNow();
}))));
}
@ParameterizedTest
@ValueSource(booleans = {false, true})
void limitRequestsResolve(boolean usePost, Vertx vertx, VertxTestContext context) {
DohResolver resolver = new DohResolver("http://localhost", 5, Duration.ofMinutes(2));
resolver.setUsePost(usePost);
int requests = 100;
Checkpoint cpPass = context.checkpoint(requests);
setupResolverWithServer(resolver, Duration.ofMillis(100), 200, 5, vertx, context)
.onSuccess(
server -> {
for (int i = 0; i < requests; i++) {
resolver
.sendAsync(qm)
.whenComplete(
(result, ex) -> {
if (ex == null) {
cpPass.flag();
} else {
context.failNow(ex);
}
});
}
});
}
@ParameterizedTest
@ValueSource(booleans = {false, true})
void initialRequestSlowResolve(boolean usePost, Vertx vertx, VertxTestContext context) {
DohResolver resolver = new DohResolver("http://localhost", 2, Duration.ofMinutes(2));
resolver.setUsePost(usePost);
int requests = 20;
allRequestsUseTimeout = false;
Checkpoint cpPass = context.checkpoint(requests);
setupResolverWithServer(resolver, Duration.ofSeconds(1), 200, 2, vertx, context)
.onSuccess(
server -> {
for (int i = 0; i < requests; i++) {
resolver
.sendAsync(qm)
.whenComplete(
(result, ex) -> {
if (ex == null) {
cpPass.flag();
} else {
context.failNow(ex);
}
});
}
});
}
@ParameterizedTest
@ValueSource(booleans = {false, true})
void initialRequestTimeoutResolve(boolean usePost, Vertx vertx, VertxTestContext context) {
DohResolver resolver = new DohResolver("http://localhost", 2, Duration.ofMinutes(2));
resolver.setUsePost(usePost);
resolver.setTimeout(Duration.ofSeconds(1));
int requests = 20;
allRequestsUseTimeout = false;
Checkpoint cpPass = context.checkpoint(requests - 1);
Checkpoint cpFail = context.checkpoint();
setupResolverWithServer(resolver, Duration.ofSeconds(2), 200, 2, vertx, context)
.onSuccess(
server -> {
Message q = qm.clone();
q.getHeader().setID(0);
resolver
.sendAsync(q)
.whenComplete(
(result, ex) -> {
if (ex == null) {
context.failNow("First request succeeded");
} else {
cpFail.flag();
}
});
vertx.setTimer(
1000,
timer -> {
for (int i = 1; i < requests; i++) {
Message qq = qm.clone();
qq.getHeader().setID(i);
resolver
.sendAsync(qq)
.whenComplete(
(result, ex) -> {
if (ex == null) {
cpPass.flag();
} else {
context.failNow("Request failed");
}
});
}
});
});
}
private Future<HttpServer> setupResolverWithServer(
DohResolver resolver,
Duration responseDelay,
int statusCode,
int maxConcurrentRequests,
Vertx vertx,
VertxTestContext context) {
return setupServer(qm, a, responseDelay, statusCode, maxConcurrentRequests, context, vertx)
.onSuccess(server -> resolver.setUriTemplate("http://localhost:" + server.actualPort()));
}
@EnabledForJreRange(
min = JRE.JAVA_9,
disabledReason = "Java 8 implementation doesn't have the initial request guard")
@ParameterizedTest
@ValueSource(booleans = {false, true})
void initialRequestGuardIfIdleConnectionTimeIsLargerThanSystemNanoTime(
boolean usePost, Vertx vertx, VertxTestContext context) {
AtomicLong startNanos = new AtomicLong(System.nanoTime());
DohResolver resolver = spy(new DohResolver("http://localhost", 2, Duration.ofMinutes(2)));
resolver.setTimeout(Duration.ofSeconds(1));
resolver.setUsePost(usePost);
// Simulate a nanoTime value that is lower than the idle timeout
doAnswer((Answer<Long>) invocationOnMock -> System.nanoTime() - startNanos.get())
.when(resolver)
.getNanoTime();
// Just add a 100ms delay before responding to the 1st call
// to simulate a 'concurrent doh request' for the 2nd call,
// then let the fake dns server respond to the 2nd call ASAP.
allRequestsUseTimeout = false;
// idleConnectionTimeout = 2s, lastRequest = 0L
// Ensure idleConnectionTimeout < System.nanoTime() - lastRequest (3s)
// Timeline:
// |<-------- 100ms -------->|
// ↑ ↑
// 1st call sent response of 1st call
// |20ms|<------ 80ms ------>|<------ few millis ------->|
// ↑ wait until 1st call ↑ ↑
// 2nd call begin 2nd call sent response of 2nd call
AtomicBoolean firstCallCompleted = new AtomicBoolean(false);
setupResolverWithServer(resolver, Duration.ofMillis(100L), 200, 2, vertx, context)
.onSuccess(
server -> {
// First call
CompletionStage<Message> firstCall =
resolver.sendAsync(qm).whenComplete((msg, ex) -> firstCallCompleted.set(true));
// Ensure second call was made after first call and uses a different query
startNanos.addAndGet(TimeUnit.MILLISECONDS.toNanos(20));
CompletionStage<Message> secondCall = resolver.sendAsync(Message.newQuery(qr));
Future.fromCompletionStage(firstCall)
.onComplete(
context.succeeding(
result ->
context.verify(
() -> {
assertEquals(Rcode.NOERROR, result.getHeader().getRcode());
assertEquals(0, result.getHeader().getID());
assertEquals(queryName, result.getQuestion().getName());
})));
Future.fromCompletionStage(secondCall)
.onComplete(
context.succeeding(
result ->
context.verify(
() -> {
assertTrue(firstCallCompleted.get());
assertEquals(Rcode.NOERROR, result.getHeader().getRcode());
assertEquals(0, result.getHeader().getID());
assertEquals(queryName, result.getQuestion().getName());
// Complete context after the 2nd call was completed.
context.completeNow();
})));
});
}
private Future<HttpServer> setupServer(
Message expectedDnsRequest,
Message dnsResponse,
Duration serverProcessingTime,
int statusCode,
int maxConcurrentRequests,
VertxTestContext context,
Vertx vertx) {
HttpVersion version =
System.getProperty("java.version").startsWith("1.")
? HttpVersion.HTTP_1_1
: HttpVersion.HTTP_2;
AtomicInteger requestCount = new AtomicInteger(0);
AtomicInteger concurrentRequests = new AtomicInteger(0);
return vertx
.createHttpServer(
new HttpServerOptions().setAlpnVersions(Collections.singletonList(version)))
.requestHandler(
httpRequest -> {
int thisRequestNum = requestCount.incrementAndGet();
int count = concurrentRequests.incrementAndGet();
if (count > maxConcurrentRequests) {
context.failNow(
"Concurrent requests exceeded: " + count + " > " + maxConcurrentRequests);
return;
}
httpRequest.endHandler(v -> concurrentRequests.decrementAndGet());
httpRequest.bodyHandler(
body -> {
context.verify(
() -> {
assertEquals(
"application/dns-message",
httpRequest.getHeader(HttpHeaderNames.CONTENT_TYPE));
byte[] actualDnsRequestBytes;
if (httpRequest.method() == HttpMethod.POST) {
actualDnsRequestBytes = body.getBytes();
} else {
actualDnsRequestBytes =
Base64.getDecoder().decode(httpRequest.getParam("dns"));
}
Message actualDnsRequest = new Message(actualDnsRequestBytes);
assertEquals(0, actualDnsRequest.getHeader().getID());
assertEquals(
expectedDnsRequest.getQuestion(), actualDnsRequest.getQuestion());
});
Message dnsResponseCopy = dnsResponse.clone();
dnsResponseCopy.getHeader().setID(0);
if (!serverProcessingTime.isZero()
&& (thisRequestNum == 1 || allRequestsUseTimeout)) {
vertx.setTimer(
serverProcessingTime.toMillis(),
timer ->
httpRequest
.response()
.setStatusCode(statusCode)
.end(Buffer.buffer(dnsResponseCopy.toWire())));
} else {
httpRequest
.response()
.setStatusCode(statusCode)
.end(Buffer.buffer(dnsResponseCopy.toWire()));
}
});
})
.listen(0);
}
}