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Refine IpNeighbour parsing

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This commit is contained in:
Mygod
2018-10-04 16:34:40 +08:00
parent ed1e1a581e
commit e85d792218
3 changed files with 14 additions and 23 deletions
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25
mobile/src/main/java/be/mygod/vpnhotspot/net/IpNeighbour.kt
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@@ -1,6 +1,6 @@
package be.mygod.vpnhotspot.net
import be.mygod.vpnhotspot.util.parseNumericAddressNoThrow
import be.mygod.vpnhotspot.util.parseNumericAddress
import timber.log.Timber
import java.io.File
import java.io.IOException
@@ -18,23 +18,19 @@ data class IpNeighbour(val ip: InetAddress, val dev: String, val lladdr: String,
* https://people.cs.clemson.edu/~westall/853/notes/arpstate.pdf
* Assumptions: IP addr (key) always present, RTM_GETNEIGH is never used and show_stats = 0
*/
private val parser = ("^(Deleted )?(.+?) (dev (.+?) )?(lladdr (.+?))?( router)?( proxy)?" +
private val parser = ("^(Deleted )?([^ ]+?) (dev ([^ ]+?) )?(lladdr (.[^ ]+?))?( router)?( proxy)?" +
"( ([INCOMPLET,RAHBSDYF]+))?\$").toRegex()
private fun checkLladdrNotLoopback(lladdr: String) = if (lladdr == "00:00:00:00:00:00") "" else lladdr
fun parse(line: String): IpNeighbour? {
val match = parser.matchEntire(line)
if (match == null) {
if (line.isNotEmpty()) Timber.w(line)
return null
}
val ip = parseNumericAddressNoThrow(match.groupValues[2]) ?: return null
val match = parser.matchEntire(line)!!
val ip = parseNumericAddress(match.groupValues[2])
val dev = match.groupValues[4]
var lladdr = checkLladdrNotLoopback(match.groupValues[6])
// use ARP as fallback
if (dev.isNotEmpty() && lladdr.isEmpty()) lladdr = checkLladdrNotLoopback(arp()
.asSequence()
.filter { parseNumericAddressNoThrow(it[ARP_IP_ADDRESS]) == ip && it[ARP_DEVICE] == dev }
.filter { parseNumericAddress(it[ARP_IP_ADDRESS]) == ip && it[ARP_DEVICE] == dev }
.map { it[ARP_HW_ADDRESS] }
.singleOrNull() ?: "")
val state = if (match.groupValues[1].isNotEmpty() || lladdr.isEmpty()) State.DELETING else
@@ -43,13 +39,16 @@ data class IpNeighbour(val ip: InetAddress, val dev: String, val lladdr: String,
"REACHABLE", "DELAY", "STALE", "PROBE", "PERMANENT" -> State.VALID
"FAILED" -> State.FAILED
"NOARP" -> return null // skip
else -> {
Timber.w("Unknown state encountered: ${match.groupValues[10]}")
return null
}
else -> throw IllegalArgumentException("Unknown state encountered: ${match.groupValues[10]}")
}
return IpNeighbour(ip, dev, lladdr, state)
}
fun parseNoThrow(line: String): IpNeighbour? = try {
parse(line)
} catch (e: Exception) {
Timber.w(IllegalArgumentException("Unable to parse line: $line", e))
null
}
private val spaces = " +".toPattern()
private val mac = "^([0-9a-f]{2}:){5}[0-9a-f]{2}$".toPattern()