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Fix MAC not showing for failures

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This commit is contained in:
Mygod
2018-01-20 23:39:07 -08:00
parent 8655562518
commit 03ccaf2a98
4 changed files with 54 additions and 35 deletions
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24
mobile/src/main/java/be/mygod/vpnhotspot/net/IpNeighbour.kt
View File

@@ -1,9 +1,8 @@
package be.mygod.vpnhotspot.net
import android.util.Log
import be.mygod.vpnhotspot.debugLog
data class IpNeighbour(val ip: String, val dev: String, val lladdr: String) {
data class IpNeighbour(val ip: String, val dev: String, val lladdr: String, val state: State) {
enum class State {
INCOMPLETE, VALID, VALID_DELAY, FAILED, DELETING
}
@@ -15,29 +14,36 @@ data class IpNeighbour(val ip: String, val dev: String, val lladdr: String) {
* Parser based on:
* https://android.googlesource.com/platform/external/iproute2/+/ad0a6a2/ip/ipneigh.c#194
* https://people.cs.clemson.edu/~westall/853/notes/arpstate.pdf
* Assumptions: IPv4 only, RTM_GETNEIGH is never used and show_stats = 0
* Assumptions: IP addr (key) always present, IPv4 only, RTM_GETNEIGH is never used and show_stats = 0
*/
private val parser =
"^(Deleted )?((.+?) )?(dev (.+?) )?(lladdr (.+?))?( proxy)?( ([INCOMPLET,RAHBSDYF]+))?\$".toRegex()
fun parse(line: String): Pair<IpNeighbour, State>? {
"^(Deleted )?(.+?) (dev (.+?) )?(lladdr (.+?))?( proxy)?( ([INCOMPLET,RAHBSDYF]+))?\$".toRegex()
fun parse(line: String): IpNeighbour? {
val match = parser.matchEntire(line)
if (match == null) {
if (!line.isBlank()) Log.w(TAG, line)
return null
}
val neighbour = IpNeighbour(match.groupValues[3], match.groupValues[5], match.groupValues[7])
val state = if (match.groupValues[1].isNotEmpty()) State.DELETING else when (match.groupValues[10]) {
val ip = match.groupValues[2]
val dev = match.groupValues[4]
var lladdr = match.groupValues[6]
// use ARP as fallback
if (dev.isNotBlank() && lladdr.isBlank()) lladdr = (NetUtils.arp()
.filter { it[NetUtils.ARP_IP_ADDRESS] == ip && it[NetUtils.ARP_DEVICE] == dev }
.map { it[NetUtils.ARP_HW_ADDRESS] }
.singleOrNull() ?: "")
val state = if (match.groupValues[1].isNotEmpty()) State.DELETING else when (match.groupValues[9]) {
"", "INCOMPLETE" -> State.INCOMPLETE
"REACHABLE", "STALE", "PROBE", "PERMANENT" -> State.VALID
"DELAY" -> State.VALID_DELAY
"FAILED" -> State.FAILED
"NOARP" -> return null // skip
else -> {
Log.w(TAG, "Unknown state encountered: ${match.groupValues[10]}")
Log.w(TAG, "Unknown state encountered: ${match.groupValues[9]}")
return null
}
}
return Pair(neighbour, state)
return IpNeighbour(ip, dev, lladdr, state)
}
}
}

13
mobile/src/main/java/be/mygod/vpnhotspot/net/IpNeighbourMonitor.kt
View File

@@ -41,13 +41,13 @@ class IpNeighbourMonitor private constructor() {
}
interface Callback {
fun onIpNeighbourAvailable(neighbours: Map<IpNeighbour, IpNeighbour.State>)
fun onIpNeighbourAvailable(neighbours: Map<String, IpNeighbour>)
fun postIpNeighbourAvailable() { }
}
private val handler = Handler()
private var updatePosted = false
val neighbours = HashMap<IpNeighbour, IpNeighbour.State>()
val neighbours = HashMap<String, IpNeighbour>()
/**
* Using monitor requires using /proc/self/ns/net which would be problematic on Android 6.0+.
*
@@ -72,9 +72,10 @@ class IpNeighbourMonitor private constructor() {
monitor.inputStream.bufferedReader().forEachLine {
debugLog(TAG, it)
synchronized(neighbours) {
val (neighbour, state) = IpNeighbour.parse(it) ?: return@forEachLine
val changed = if (state == IpNeighbour.State.DELETING) neighbours.remove(neighbour) != null else
neighbours.put(neighbour, state) != state
val neighbour = IpNeighbour.parse(it) ?: return@forEachLine
val changed = if (neighbour.state == IpNeighbour.State.DELETING)
neighbours.remove(neighbour.ip) != null
else neighbours.put(neighbour.ip, neighbour) != neighbour
if (changed) postUpdateLocked()
}
}
@@ -94,7 +95,7 @@ class IpNeighbourMonitor private constructor() {
process.inputStream.bufferedReader().useLines {
synchronized(neighbours) {
neighbours.clear()
neighbours.putAll(it.map(IpNeighbour.Companion::parse).filterNotNull().toMap())
neighbours.putAll(it.map(IpNeighbour.Companion::parse).filterNotNull().associateBy { it.ip })
postUpdateLocked()
}
}

27
mobile/src/main/java/be/mygod/vpnhotspot/net/NetUtils.kt
View File

@@ -4,6 +4,7 @@ import android.os.Build
import android.os.Bundle
import android.support.annotation.RequiresApi
import java.io.File
import java.io.IOException
object NetUtils {
// hidden constants from ConnectivityManager
@@ -27,12 +28,24 @@ object NetUtils {
extras.getStringArrayList(EXTRA_ACTIVE_TETHER).toSet() + extras.getStringArrayList(EXTRA_ACTIVE_LOCAL_ONLY)
else extras.getStringArrayList(EXTRA_ACTIVE_TETHER_LEGACY).toSet()
fun arp(iface: String? = null) = File("/proc/net/arp").bufferedReader().useLines {
// IP address HW type Flags HW address Mask Device
it.map { it.split(spaces) }
.drop(1)
.filter { it.size >= 4 && (iface == null || it.getOrNull(5) == iface) &&
mac.matcher(it[3]).matches() }
.associateBy({ it[3] }, { it[0] })
// IP address HW type Flags HW address Mask Device
const val ARP_IP_ADDRESS = 0
const val ARP_HW_ADDRESS = 3
const val ARP_DEVICE = 5
private const val ARP_CACHE_EXPIRE = 1L * 1000 * 1000 * 1000
private var arpCache = emptyList<List<String>>()
private var arpCacheTime = -ARP_CACHE_EXPIRE
fun arp(): List<List<String>> {
if (System.nanoTime() - arpCacheTime >= ARP_CACHE_EXPIRE) try {
arpCache = File("/proc/net/arp").bufferedReader().useLines {
it.map { it.split(spaces) }
.drop(1)
.filter { it.size >= 6 && mac.matcher(it[ARP_HW_ADDRESS]).matches() }
.toList()
}
} catch (e: IOException) {
e.printStackTrace()
}
return arpCache
}
}