Create `MullvadVpnService` service

1 files changed, 79 insertions, 0 deletions

diff --git a/android/src/main/kotlin/net/mullvad/mullvadvpn/MullvadVpnService.kt b/android/src/main/kotlin/net/mullvad/mullvadvpn/MullvadVpnService.kt
new file mode 100644
index 0000000000..dcd4935ee4
--- /dev/null
+++ b/android/src/main/kotlin/net/mullvad/mullvadvpn/MullvadVpnService.kt
@@ -0,0 +1,79 @@
+package net.mullvad.mullvadvpn
+
+import java.net.InetAddress
+
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.CompletableDeferred
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.net.VpnService
+
+import net.mullvad.mullvadvpn.model.TunConfig
+
+var INNER_VPN_SERVICE = CompletableDeferred<MullvadVpnService.InnerVpnService>()
+var SERVICE_NOT_RUNNING = true
+
+class MullvadVpnService(val context: Context) {
+    class InnerVpnService : VpnService() {
+        override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
+            INNER_VPN_SERVICE.complete(this)
+
+            return super.onStartCommand(intent, flags, startId)
+        }
+
+        override fun onDestroy() {
+            INNER_VPN_SERVICE = CompletableDeferred<MullvadVpnService.InnerVpnService>()
+            SERVICE_NOT_RUNNING = true
+            super.onDestroy()
+        }
+
+        fun builder(): Builder {
+            return Builder()
+        }
+    }
+
+    fun createTun(config: TunConfig): Int {
+        return createTun(config, startService())
+    }
+
+    fun bypass(socket: Int): Boolean {
+        return startService().protect(socket)
+    }
+
+    private fun startService(): InnerVpnService {
+        lateinit var service: InnerVpnService
+
+        if (SERVICE_NOT_RUNNING) {
+            SERVICE_NOT_RUNNING = false
+            context.startService(Intent(context, InnerVpnService::class.java))
+        }
+
+        runBlocking { service = INNER_VPN_SERVICE.await() }
+
+        return service
+    }
+
+    private fun createTun(config: TunConfig, service: InnerVpnService): Int {
+        val builder = service.builder().apply {
+            for (address in config.addresses) {
+                addAddress(address, 32)
+            }
+
+            for (dnsServer in config.dnsServers) {
+                addDnsServer(dnsServer)
+            }
+
+            for (route in config.routes) {
+                addRoute(route.address, route.prefixLength as Int)
+            }
+
+            setMtu(config.mtu)
+        }
+
+        val vpnInterface = builder.establish()
+
+        return vpnInterface.detachFd()
+    }
+}