Files
vpnhotspotmod/mobile/src/main/java/be/mygod/vpnhotspot/net/IpNeighbour.kt
Mygod 0660a20fcb Support showing connected devices from system tethering
Also fixes IP address not showing up.
2018-01-20 22:52:54 -08:00

44 lines
1.7 KiB
Kotlin

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) {
enum class State {
INCOMPLETE, VALID, VALID_DELAY, FAILED, DELETING
}
companion object {
private const val TAG = "IpNeighbour"
/**
* 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
*/
private val parser =
"^(Deleted )?((.+?) )?(dev (.+?) )?(lladdr (.+?))?( proxy)?( ([INCOMPLET,RAHBSDYF]+))?\$".toRegex()
fun parse(line: String): Pair<IpNeighbour, State>? {
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]) {
"", "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]}")
return null
}
}
return Pair(neighbour, state)
}
}
}