7995b438eb
Add an ArpResponder based on a generic PacketResponder class, and a TestHttpServer based on NanoHttpd. Test: tests based on these utilities Bug: 160617623 Bug: 160656765 Change-Id: I50b872a8b23e8df997e8f62f0adc7c0256c4d74d
61 lines
2.3 KiB
Kotlin
61 lines
2.3 KiB
Kotlin
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.testutils
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import android.net.MacAddress
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import java.net.Inet4Address
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import java.net.InetAddress
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import java.nio.ByteBuffer
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private val TYPE_ARP = byteArrayOf(0x08, 0x06)
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// Arp reply header for IPv4 over ethernet
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private val ARP_REPLY_IPV4 = byteArrayOf(0x00, 0x01, 0x08, 0x00, 0x06, 0x04, 0x00, 0x02)
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/**
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* A class that can be used to reply to ARP packets on a [TapPacketReader].
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*/
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class ArpResponder(
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reader: TapPacketReader,
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table: Map<Inet4Address, MacAddress>,
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name: String = ArpResponder::class.java.simpleName
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) : PacketResponder(reader, ArpRequestFilter(), name) {
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// Copy the map if not already immutable (toMap) to make sure it is not modified
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private val table = table.toMap()
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override fun replyToPacket(packet: ByteArray, reader: TapPacketReader) {
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val targetIp = InetAddress.getByAddress(
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packet.copyFromIndexWithLength(ARP_TARGET_IPADDR_OFFSET, 4))
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as Inet4Address
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val macAddr = table[targetIp]?.toByteArray() ?: return
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val senderMac = packet.copyFromIndexWithLength(ARP_SENDER_MAC_OFFSET, 6)
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reader.sendResponse(ByteBuffer.wrap(
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// Ethernet header
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senderMac + macAddr + TYPE_ARP +
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// ARP message
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ARP_REPLY_IPV4 +
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macAddr /* sender MAC */ +
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targetIp.address /* sender IP addr */ +
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macAddr /* target mac */ +
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targetIp.address /* target IP addr */
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))
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}
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}
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private fun ByteArray.copyFromIndexWithLength(start: Int, len: Int) =
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copyOfRange(start, start + len)
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