44 lines
1.7 KiB
Kotlin
44 lines
1.7 KiB
Kotlin
package be.mygod.vpnhotspot.net
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import android.util.Log
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import be.mygod.vpnhotspot.debugLog
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data class IpNeighbour(val ip: String, val dev: String, val lladdr: String) {
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enum class State {
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INCOMPLETE, VALID, VALID_DELAY, FAILED, DELETING
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}
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companion object {
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private const val TAG = "IpNeighbour"
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/**
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* Parser based on:
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* https://android.googlesource.com/platform/external/iproute2/+/ad0a6a2/ip/ipneigh.c#194
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* https://people.cs.clemson.edu/~westall/853/notes/arpstate.pdf
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* Assumptions: IPv4 only, RTM_GETNEIGH is never used and show_stats = 0
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*/
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private val parser =
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"^(Deleted )?((.+?) )?(dev (.+?) )?(lladdr (.+?))?( proxy)?( ([INCOMPLET,RAHBSDYF]+))?\$".toRegex()
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fun parse(line: String): Pair<IpNeighbour, State>? {
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val match = parser.matchEntire(line)
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if (match == null) {
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if (!line.isBlank()) Log.w(TAG, line)
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return null
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}
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val neighbour = IpNeighbour(match.groupValues[3], match.groupValues[5], match.groupValues[7])
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val state = if (match.groupValues[1].isNotEmpty()) State.DELETING else when (match.groupValues[10]) {
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"", "INCOMPLETE" -> State.INCOMPLETE
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"REACHABLE", "STALE", "PROBE", "PERMANENT" -> State.VALID
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"DELAY" -> State.VALID_DELAY
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"FAILED" -> State.FAILED
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"NOARP" -> return null // skip
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else -> {
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Log.w(TAG, "Unknown state encountered: ${match.groupValues[10]}")
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return null
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}
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}
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return Pair(neighbour, state)
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}
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}
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}
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