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/*
* Copyright (C) 2017 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.devicecommandhandlers
import com.android.fakeadbserver.DeviceState
import com.android.fakeadbserver.FakeAdbServer
import com.android.fakeadbserver.PortForwarder
import java.io.IOException
import java.net.Socket
import java.nio.charset.StandardCharsets
/**
* Creates a reverse socket connection from this device to the host.
*/
internal class ReverseForwardCommandHandler : DeviceCommandHandler("reverse") {
override fun invoke(
server: FakeAdbServer,
socket: Socket,
device: DeviceState,
args: String
) {
if (args == "list-forward") {
// "reverse:list-forward"
handleListForward(socket, device)
} else if (args == "killforward-all") {
// "reverse:killforward-all"
handleKillForwardAll(socket, device)
} else if (args.startsWith("killforward:")) {
// "reverse:killforward:[from]"
handleKillForward(socket, device, args)
} else if (args.startsWith("forward:")) {
// "reverse:forward:[from]:[to]
handleForward(socket, device, args)
} else {
writeFailResponse(
socket.getOutputStream(),
"Unsupported reverse connection command: $args"
)
}
}
private fun handleForward(
socket: Socket,
device: DeviceState,
args: String
) {
val stream = socket.getOutputStream()
val newArgs = args.substringAfter("forward:")
val forwardArgs = ForwardArgs.parse(newArgs)
// The "from" is the device in case of reverse forward
when (val deviceTransport = forwardArgs.fromTransport) {
"tcp" -> {}
else -> {
writeFailResponse(
stream,
"Unsupported device socket specification: $deviceTransport"
)
return
}
}
var devicePort: Int
var devicePortToSendBack: Int? = null
try {
devicePort = forwardArgs.fromTransportArg.toInt()
if (devicePort == 0) {
// This is to emulate ADB Server behavior of picking an available port
// This is currently hard-coded as we don't actually create sockets
devicePort = 40200 + (Math.random() * 100).toInt()
devicePortToSendBack = devicePort
}
} catch (ignored: NumberFormatException) {
writeFailResponse(
stream,
"Invalid host port specified: " + forwardArgs.fromTransportArg
)
return
}
// The "to" is the local machine in case of reverse forward
val forwarder = when (val hostTransport = forwardArgs.toTransport) {
"tcp" -> try {
val hostPort = forwardArgs.toTransportArg.toInt()
PortForwarder.createPortForwarder(devicePort, hostPort)
} catch (ignored: NumberFormatException) {
writeFailResponse(
stream, "Invalid port specified: " + forwardArgs.toTransportArg
)
return
}
"local" -> PortForwarder.createUnixForwarder(devicePort, forwardArgs.toTransportArg)
"jdwp" -> {
writeFailResponse(stream, "JDWP connections not yet supported in fake ADB Server.")
return
}
else -> {
writeFailResponse(
stream,
"Unsupported transport specified: $hostTransport"
)
return
}
}
val bindOk = device.addReversePortForwarder(forwarder, forwardArgs.norebind)
try {
if (bindOk) {
// We send 2 OKAY answers: 1st OKAY is connect, 2nd OKAY is status.
// See
// https://cs.android.com/android/platform/superproject/+/3a52886262ae22477a7d8ffb12adba64daf6aafa:packages/modules/adb/adb.cpp;l=1058
writeOkay(stream)
if (devicePortToSendBack != null) {
writeOkayResponse(stream, devicePortToSendBack.toString())
} else {
writeOkay(stream)
}
} else {
writeFailResponse(stream, "Could not bind to the specified forwarding ports.")
}
} catch (ignored: IOException) {
}
}
private fun handleKillForward(
socket: Socket,
device: DeviceState,
args: String
) {
val stream = socket.outputStream
val newArgs = args.substringAfter("killforward:")
val hostAddress = newArgs.split(":".toRegex()).toTypedArray()
when (hostAddress[0]) {
"tcp" -> {}
"local" -> {
writeFailResponse(
stream, "Host Unix domain sockets not supported in fake ADB Server."
)
return
}
else -> {
writeFailResponse(stream, "Invalid host transport specified: " + hostAddress[0])
return
}
}
val hostPort: Int = try {
hostAddress[1].toInt()
} catch (ignored: NumberFormatException) {
writeFailResponse(stream, "Invalid port specified: " + hostAddress[1])
return
}
if (!device.removeReversePortForwarder(hostPort)) {
writeFailResponse(stream, "Could not successfully remove forward.")
return
}
// We send 2 OKAY answers: 1st OKAY is connect, 2nd OKAY is status.
// See
// https://cs.android.com/android/platform/superproject/+/3a52886262ae22477a7d8ffb12adba64daf6aafa:packages/modules/adb/adb.cpp;l=1058
writeOkay(stream)
writeOkay(stream)
}
private fun handleKillForwardAll(socket: Socket, device: DeviceState) {
val stream = socket.outputStream
device.removeAllReversePortForwarders()
// We send 2 OKAY answers: 1st OKAY is connect, 2nd OKAY is status.
// See
// https://cs.android.com/android/platform/superproject/+/3a52886262ae22477a7d8ffb12adba64daf6aafa:packages/modules/adb/adb.cpp;l=1058
writeOkay(stream)
writeOkay(stream)
}
private fun handleListForward(socket: Socket, device: DeviceState) {
val stream = socket.outputStream
val deviceListString = formatDeviceReverseForwardList(device)
writeOkay(stream)
write4ByteHexIntString(stream, deviceListString.length)
stream.write(deviceListString.toByteArray(StandardCharsets.US_ASCII))
}
private fun formatDeviceReverseForwardList(device: DeviceState): String {
val builder = StringBuilder()
for (portForwarder in device.allReversePortForwarders.values) {
// The serial number of the transport is hard-coded:
// https://cs.android.com/android/platform/superproject/+/3a52886262ae22477a7d8ffb12adba64daf6aafa:packages/modules/adb/daemon/usb.cpp;l=759
builder.append("UsbFfs")
builder.append(" ")
builder.append("tcp:${portForwarder?.source?.port}")
builder.append(" ")
builder.append("tcp:${portForwarder?.destination?.port}")
builder.append("\n")
}
// Remove trailing '\n' to match adb server behavior
if (builder.isNotEmpty()) {
builder.deleteCharAt(builder.length - 1)
}
return builder.toString()
}
}
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