| // 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 <memory> |
| |
| #include "base/macros.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/strings/string_piece.h" |
| #include "net/base/net_export.h" |
| |
| namespace net { |
| |
| class OptRecordRdata; |
| |
| namespace dns_protocol { |
| struct Header; |
| } |
| |
| class IOBufferWithSize; |
| |
| // Represents on-the-wire DNS query message as an object. |
| 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. |
| // If opt_rdata is not null, an OPT record will be added to the "Additional" |
| // section of the query. |
| DnsQuery(uint16_t id, |
| const base::StringPiece& qname, |
| uint16_t qtype, |
| const OptRecordRdata* opt_rdata = nullptr); |
| ~DnsQuery(); |
| |
| // Clones |this| verbatim, with ID field of the header set to |id|. |
| std::unique_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); |
| |
| // Returns the size of the question section. |
| size_t question_size() const { |
| // QNAME + QTYPE + QCLASS |
| return qname_size_ + sizeof(uint16_t) + sizeof(uint16_t); |
| } |
| |
| // 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_; |
| |
| // Pointer to the dns header section. |
| dns_protocol::Header* header_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DnsQuery); |
| }; |
| |
| } // namespace net |
| |
| #endif // NET_DNS_DNS_QUERY_H_ |