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/*
* Copyright (C) 2019 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 required 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.
*/
package com.android.testutils
import android.net.DnsResolver
import android.net.InetAddresses
import android.os.Looper
import android.os.Handler
import com.android.internal.annotations.GuardedBy
import java.net.InetAddress
import java.util.concurrent.Executor
import org.mockito.invocation.InvocationOnMock
import org.mockito.Mockito.any
import org.mockito.Mockito.anyInt
import org.mockito.Mockito.doAnswer
const val TYPE_UNSPECIFIED = -1
// TODO: Integrate with NetworkMonitorTest.
class FakeDns(val mockResolver: DnsResolver) {
class DnsEntry(val hostname: String, val type: Int, val addresses: List<InetAddress>) {
fun match(host: String, type: Int) = hostname.equals(host) && type == type
}
@GuardedBy("answers")
val answers = ArrayList<DnsEntry>()
fun getAnswer(hostname: String, type: Int): DnsEntry? = synchronized(answers) {
return answers.firstOrNull { it.match(hostname, type) }
}
fun setAnswer(hostname: String, answer: Array<String>, type: Int) = synchronized(answers) {
val ans = DnsEntry(hostname, type, generateAnswer(answer))
// Replace or remove the existing one.
when (val index = answers.indexOfFirst { it.match(hostname, type) }) {
-1 -> answers.add(ans)
else -> answers[index] = ans
}
}
private fun generateAnswer(answer: Array<String>) =
answer.filterNotNull().map { InetAddresses.parseNumericAddress(it) }
fun startMocking() {
// Mock DnsResolver.query() w/o type
doAnswer {
mockAnswer(it, 1, -1, 3, 5)
}.`when`(mockResolver).query(any() /* network */, any() /* domain */, anyInt() /* flags */,
any() /* executor */, any() /* cancellationSignal */, any() /*callback*/)
// Mock DnsResolver.query() w/ type
doAnswer {
mockAnswer(it, 1, 2, 4, 6)
}.`when`(mockResolver).query(any() /* network */, any() /* domain */, anyInt() /* nsType */,
anyInt() /* flags */, any() /* executor */, any() /* cancellationSignal */,
any() /*callback*/)
}
private fun mockAnswer(
it: InvocationOnMock,
posHos: Int,
posType: Int,
posExecutor: Int,
posCallback: Int
) {
val hostname = it.arguments[posHos] as String
val executor = it.arguments[posExecutor] as Executor
val callback = it.arguments[posCallback] as DnsResolver.Callback<List<InetAddress>>
var type = if (posType != -1) it.arguments[posType] as Int else TYPE_UNSPECIFIED
val answer = getAnswer(hostname, type)
if (answer != null && !answer.addresses.isNullOrEmpty()) {
Handler(Looper.getMainLooper()).post({ executor.execute({
callback.onAnswer(answer.addresses, 0); }) })
}
}
/** Clears all entries. */
fun clearAll() = synchronized(answers) {
answers.clear()
}
}
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