Allow overriding DNS server. Set DNS if internal docker host is being shared

app/Client/Factory.php

@@ -142,7 +142,7 @@ class Factory
 
         config()->set('expose.dashboard_port', $dashboardPort);
 
-        $this->app = new App('127.0.0.1', $dashboardPort, '0.0.0.0', $this->loop);
+        $this->app = new App('0.0.0.0', $dashboardPort, '0.0.0.0', $this->loop);
 
         $this->addRoutes();
 

app/Client/Http/HttpClient.php

@@ -66,7 +66,7 @@ class HttpClient
     protected function createConnector(): Connector
     {
         return new Connector($this->loop, [
-            'dns' => '127.0.0.1',
+            'dns' => config('expose.dns', '127.0.0.1'),
             'tls' => [
                 'verify_peer' => false,
                 'verify_peer_name' => false,

app/Commands/ShareCommand.php

@@ -10,7 +10,7 @@ use Symfony\Component\Console\Output\ConsoleOutput;
 
 class ShareCommand extends Command
 {
-    protected $signature = 'share {host} {--subdomain=} {--auth=} {--server-host=} {--server-port=}';
+    protected $signature = 'share {host} {--subdomain=} {--auth=} {--server-host=} {--server-port=} {--dns=}';
 
     protected $description = 'Share a local url with a remote expose server';
 
@@ -31,6 +31,14 @@ class ShareCommand extends Command
         $serverPort = $this->option('server-port') ?? config('expose.port', 8080);
         $auth = $this->option('auth') ?? config('expose.auth_token', '');
 
+        if (strstr($this->argument('host'), 'host.docker.internal')) {
+            config(['expose.dns' => true]);
+        }
+
+        if ($this->option('dns') !== null) {
+            config(['expose.dns' => empty($this->option('dns')) ? true : $this->option('dns')]);
+        }
+
         (new Factory())
             ->setLoop(app(LoopInterface::class))
             ->setHost($serverHost)

config/expose.php

@@ -29,6 +29,18 @@ return [
     */
     'port' => 443,
 
+    /*
+    |--------------------------------------------------------------------------
+    | DNS
+    |--------------------------------------------------------------------------
+    |
+    | The DNS server to use when resolving the shared URLs.
+    | When Expose is running from within Docker containers, you should set this to 
+    | `true` to fall-back to the system default DNS servers.
+    |
+    */
+    'dns' => '127.0.0.1',
+
     /*
     |--------------------------------------------------------------------------
     | Auth Token