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/*
* Copyright (C) 2022 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.fakeadbserver.services
import com.android.fakeadbserver.DeviceState
import com.android.fakeadbserver.ShellV2Protocol
import java.io.EOFException
import java.net.Socket
import java.nio.charset.StandardCharsets.UTF_8
/**
* Abstraction over access to stdin/stdout/stderr/exit code of an ADB shell command.
*
* This allows shell command implementor in [FakeAdbServer] to have a single implementation
* that can deal with the simplified stdin/stdout protocol, or the full [ShellV2Protocol].
*/
interface ShellCommandOutput {
fun writeStdout(bytes: ByteArray)
fun writeStderr(bytes: ByteArray)
fun writeStdout(text: String) {
writeStdout(text.toByteArray(UTF_8))
}
fun writeStderr(text: String) {
writeStderr(text.toByteArray(UTF_8))
}
fun writeExitCode(exitCode: Int)
fun readStdin(bytes: ByteArray, offset: Int, length: Int): Int
}
/**
* Implementation of [ShellCommandOutput] that writes stdout/stderr directly to
* [Socket.getOutputStream], and ignores exit code. This corresponds to how
* the legacy "shell:" ADB service works.
*/
class LegacyShellOutput(socket: Socket, val device: DeviceState) : ShellCommandOutput {
private val input = socket.getInputStream()
private val output = socket.getOutputStream()
override fun writeStdout(bytes: ByteArray) {
output.write(bytes.replaceNewLineForOlderDevices(device))
}
override fun writeStderr(bytes: ByteArray) {
output.write(bytes.replaceNewLineForOlderDevices(device))
}
override fun writeExitCode(exitCode: Int) {
// This is not implemented for this version of the protocol
}
override fun readStdin(bytes: ByteArray, offset: Int, length: Int): Int {
return input.read(bytes, offset, length)
}
}
/**
* Implementation of [ShellCommandOutput] that writes stdout/stderr directly to
* [Socket.getOutputStream], and ignores exit code. This corresponds to how
* the legacy "exec:" ADB service works
*/
class ExecOutput(socket: Socket) : ShellCommandOutput {
private val input = socket.getInputStream()
private val output = socket.getOutputStream()
override fun writeStdout(bytes: ByteArray) {
output.write(bytes)
}
override fun writeStderr(bytes: ByteArray) {
output.write(bytes)
}
override fun writeExitCode(exitCode: Int) {
// This is not implemented for this version of the protocol
}
override fun readStdin(bytes: ByteArray, offset: Int, length: Int): Int {
return input.read(bytes, offset, length)
}
}
/** Replaces '\n'->'\r\n' for older devices */
fun ByteArray.replaceNewLineForOlderDevices(device: DeviceState): ByteArray {
val newLineByte = '\n'.code.toByte()
if (device.apiLevel > 23 || !contains(newLineByte)) {
return this
}
val newLineCount = this.count { it == newLineByte }
val result = ByteArray(size + newLineCount)
var outputIndex = 0
for (byte in this) {
if (byte == newLineByte) {
result[outputIndex++] = '\r'.code.toByte()
}
result[outputIndex++] = byte
}
return result
}
/**
* Implementation of [ShellCommandOutput] that read and writes from/to the underlying socket
* using the [ShellV2Protocol]. This corresponds to how the "shell,v2:" ADB service works.
*/
class ShellV2Output(socket: Socket) : ShellCommandOutput {
private val protocol = ShellV2Protocol(socket)
private var currentStdinPacket: ShellV2Protocol.Packet? = null
private var currentStdinPacketOffset = 0
override fun writeStdout(bytes: ByteArray) {
protocol.writeStdout(bytes)
}
override fun writeStderr(bytes: ByteArray) {
protocol.writeStderr(bytes)
}
override fun writeExitCode(exitCode: Int) {
protocol.writeExitCode(exitCode)
}
override fun readStdin(bytes: ByteArray, offset: Int, length: Int): Int {
while (true) {
// Process current packet if there is one (and it has remaining data)
val packet = currentStdinPacket
if (packet != null) {
if (currentStdinPacketOffset < packet.bytes.size) {
val count = Integer.min(length, packet.bytes.size - currentStdinPacketOffset)
System.arraycopy(packet.bytes, currentStdinPacketOffset, bytes, offset, count)
currentStdinPacketOffset += count
return count
}
}
// We need a new packet, forget the old one and read a new one
assert(currentStdinPacket.let { it == null || it.bytes.size == currentStdinPacketOffset })
currentStdinPacket = null
currentStdinPacketOffset = 0
try {
val newPacket = protocol.readPacket()
when (newPacket.kind) {
ShellV2Protocol.PacketKind.STDIN -> {
currentStdinPacket = newPacket
}
ShellV2Protocol.PacketKind.CLOSE_STDIN -> {
return -1
}
else -> {
// TODO: Handle other type of packets
}
}
} catch (e: EOFException) {
return -1
}
}
}
}
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