Multicast DNS implementation (initial)

net/dns/mdns_query.h

+// Copyright (c) 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 NET_DNS_MDNS_QUERY_H__
+#define NET_DNS_MDNS_QUERY_H__
+
+#include <map>
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/string_piece.h"
+#include "net/base/io_buffer.h"
+#include "net/dns/dns_protocol.h"
+#include "net/dns/record_parsed.h"
+
+namespace net {
+
+// Note: Currently this class is very similar to DnsQuery, but it is kept
+// separate to allow for adding known answers to the additional answer question.
+
+class MDnsQuery {

[szym, 2013/06/07 16:40:02]

Could we make this CL a little bit smaller, by using DnsQuery now and moving
this to a subsequent CL?

[Noam Samuel, 2013/06/07 23:54:43]

Done. Note that this adds the RD flag to queries, which isn't compliant with the
mDNS spec.

[szym, 2013/06/10 21:58:28]

I missed the RD bit. We certainly don't want clearly incorrect code. I'm ok with
MDnsQuery, but the comment needs to legitimize its presence. Alternatively, you
could add DnsQuery::set_flags(uint16)  (pass them in host order).

+ public:
+MDnsQuery(const base::StringPiece& qname, uint16 qtype);
+  ~MDnsQuery();
+
+  // TODO(noamsml): void AddAnswer();
+
+  IOBuffer* io_buffer() const { return io_buffer_.get(); }
+  unsigned size() const { return io_buffer_->size(); }
+
+ private:
+  scoped_refptr<IOBufferWithSize> io_buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(MDnsQuery);
+};
+}  // namespace net
+
+#endif  // NET_DNS_MDNS_QUERY_H__