GCP2.0 Device: mDNS basics

cloud_print/gcp20/prototype/dns_sd_server.h

Index: cloud_print/gcp20/prototype/dns_sd_server.h
diff --git a/cloud_print/gcp20/prototype/dns_sd_server.h b/cloud_print/gcp20/prototype/dns_sd_server.h
new file mode 100644
index 0000000000000000000000000000000000000000..9c8ed96b7d33d62790d7797dc061f5b963911f2f
--- /dev/null
+++ b/cloud_print/gcp20/prototype/dns_sd_server.h
@@ -0,0 +1,62 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef GCP20_PROTOTYPE_DNS_SD_H_
+#define GCP20_PROTOTYPE_DNS_SD_H_
+
+#include <vector>
+
+#include "net/dns/dns_protocol.h"
+#include "net/udp/udp_socket.h"
+
+// Class for sending multicast announcements, receiving queries and answering on
+// them. Client should call |ProccessMessages| periodically to make server work.
+class DnsSdServer {
+ public:
+  // Constructs unstarted server.
+  DnsSdServer();
+
+  // Stops server.
+  ~DnsSdServer();
+
+  // Starts the server. Returns |true| if server works. Also sends
+  // announcement.
+  bool Start();
+
+  // Sends announcement if server works.
+  void Update();
+
+  // Stops server with announcement.
+  void Shutdown();
+
+  // Process pending queries for the server.
+  void ProcessMessages();
+
+  // Returns |true| if server works.
+  bool is_online() { return is_online_; }
+
+ private:
+  // Binds a socket to multicast address. Returns |true| on success.
+  bool CreateSocket();
+
+  // Sends announcement.
+  void SendAnnouncement(uint32 ttl);
+
+  // Returns |true| if server received some questions.
+  bool CheckPendingQueries();
+
+  // Stores |true| if server was started.
+  bool is_online_;
+
+  // Stores socket to multicast address.
+  scoped_ptr<net::UDPSocket> socket_;
+
+  // Stores multicast address end point.
+  net::IPEndPoint multicast_address_;
+
+  DISALLOW_COPY_AND_ASSIGN(DnsSdServer);
+};
+
+#endif  // GCP20_PROTOTYPE_DNS_SD_H_
+