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Support refresh routing rules

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Useful when VPN interface has changed.
This commit is contained in:
Mygod
2018-01-05 10:07:20 +08:00
parent e82ba20c20
commit c37901a2de
7 changed files with 87 additions and 74 deletions
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10
mobile/src/main/java/be/mygod/vpnhotspot/Routing.kt
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@@ -1,5 +1,6 @@
package be.mygod.vpnhotspot
import be.mygod.vpnhotspot.App.Companion.app
import java.io.IOException
import java.net.Inet4Address
import java.net.InetAddress
@@ -16,10 +17,12 @@ class Routing(private val upstream: String, val downstream: String, ownerAddress
"while ip rule del priority 17999; do done")
}
class InterfaceNotFoundException : IOException()
class InterfaceNotFoundException : IOException() {
override val message: String get() = app.getString(R.string.exception_interface_not_found)
}
val hostAddress: String = (ownerAddress ?: NetworkInterface.getByName(downstream)?.inetAddresses?.asSequence()
?.singleOrNull { it is Inet4Address } ?: throw InterfaceNotFoundException()).hostAddress
val hostAddress = ownerAddress ?: NetworkInterface.getByName(downstream)?.inetAddresses?.asSequence()
?.singleOrNull { it is Inet4Address } ?: throw InterfaceNotFoundException()
private val startScript = LinkedList<String>()
private val stopScript = LinkedList<String>()
@@ -52,6 +55,7 @@ class Routing(private val upstream: String, val downstream: String, ownerAddress
}
fun dnsRedirect(dns: String): Routing {
val hostAddress = hostAddress.hostAddress
startScript.add("iptables -t nat -A PREROUTING -i $downstream -p tcp -d $hostAddress --dport 53 -j DNAT --to-destination $dns")
startScript.add("iptables -t nat -A PREROUTING -i $downstream -p udp -d $hostAddress --dport 53 -j DNAT --to-destination $dns")
stopScript.addFirst("iptables -t nat -D PREROUTING -i $downstream -p tcp -d $hostAddress --dport 53 -j DNAT --to-destination $dns")