From 862b991d9a10296dc0c419fa93babb11614c3957 Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Mon, 3 Jul 2017 22:52:34 +0200
Subject: Only allow one VPN connection at a time

---
 .../org/pacien/tincapp/service/TincVpnService.kt   | 31 ++++++++++++----------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/app/src/main/java/org/pacien/tincapp/service/TincVpnService.kt b/app/src/main/java/org/pacien/tincapp/service/TincVpnService.kt
index 59d9e34..30e2956 100644
--- a/app/src/main/java/org/pacien/tincapp/service/TincVpnService.kt
+++ b/app/src/main/java/org/pacien/tincapp/service/TincVpnService.kt
@@ -19,28 +19,31 @@ class TincVpnService : VpnService() {
     private var netName: String? = null
 
     override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
-        netName = intent.getStringExtra(INTENT_EXTRA_NET_NAME)!!
+        startVpn(intent.getStringExtra(INTENT_EXTRA_NET_NAME)!!)
+        return Service.START_STICKY
+    }
 
-        val net = Builder().setSession(netName)
-        net.apply(VpnInterfaceConfiguration(AppPaths.netConfFile(netName!!)))
-        applyIgnoringException(net::addDisallowedApplication, BuildConfig.APPLICATION_ID)
+    override fun onDestroy() = try {
+        Tinc.stop(netName!!)
+    } catch (e: IOException) {
+        e.printStackTrace()
+    } finally {
+        netName = null
+    }
 
-        try {
-            Tincd.start(netName!!, net.establish().detachFd())
-        } catch (e: IOException) {
-            e.printStackTrace()
-        }
+    private fun startVpn(netName: String) {
+        if (netName == this.netName) onDestroy()
+        this.netName = netName
 
-        return Service.START_STICKY
-    }
+        val net = Builder().setSession(netName)
+        net.apply(VpnInterfaceConfiguration(AppPaths.netConfFile(netName)))
+        applyIgnoringException(net::addDisallowedApplication, BuildConfig.APPLICATION_ID)
 
-    override fun onDestroy() {
         try {
-            Tinc.stop(netName!!)
+            Tincd.start(netName, net.establish().detachFd())
         } catch (e: IOException) {
             e.printStackTrace()
         }
-
     }
 
     companion object {
-- 
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