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// Copyright (c) 2011 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_DNS_QUERY_H_
#define NET_DNS_DNS_QUERY_H_
#include <stddef.h>
#include <stdint.h>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_piece.h"
#include "net/base/net_export.h"
namespace net {
namespace dns_protocol {
struct Header;
}
class IOBufferWithSize;
// Represents on-the-wire DNS query message as an object.
// TODO(szym): add support for the OPT pseudo-RR (EDNS0/DNSSEC).
class NET_EXPORT_PRIVATE DnsQuery {
public:
// Constructs a query message from |qname| which *MUST* be in a valid
// DNS name format, and |qtype|. The qclass is set to IN.
DnsQuery(uint16_t id, const base::StringPiece& qname, uint16_t qtype);
~DnsQuery();
// Clones |this| verbatim, with ID field of the header set to |id|.
scoped_ptr<DnsQuery> CloneWithNewId(uint16_t id) const;
// DnsQuery field accessors.
uint16_t id() const;
base::StringPiece qname() const;
uint16_t qtype() const;
// Returns the Question section of the query. Used when matching the
// response.
base::StringPiece question() const;
// IOBuffer accessor to be used for writing out the query.
IOBufferWithSize* io_buffer() const { return io_buffer_.get(); }
void set_flags(uint16_t flags);
private:
DnsQuery(const DnsQuery& orig, uint16_t id);
// Convenience for header access.
dns_protocol::Header* header();
// Size of the DNS name (*NOT* hostname) we are trying to resolve; used
// to calculate offsets.
size_t qname_size_;
// Contains query bytes to be consumed by higher level Write() call.
scoped_refptr<IOBufferWithSize> io_buffer_;
DISALLOW_COPY_AND_ASSIGN(DnsQuery);
};
} // namespace net
#endif // NET_DNS_DNS_QUERY_H_
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