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// 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_RECORD_RDATA_H_
#define NET_DNS_RECORD_RDATA_H_
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_piece.h"
#include "net/base/big_endian.h"
#include "net/base/net_export.h"
#include "net/base/net_util.h"
#include "net/dns/dns_protocol.h"
namespace net {
class DnsRecordParser;
// Parsed represenation of the extra data in a record. Does not include standard
// DNS record data such as TTL, Name, Type and Class.
class NET_EXPORT_PRIVATE RecordRdata {
public:
virtual ~RecordRdata() {}
virtual bool IsEqual(const RecordRdata* other) const = 0;
virtual uint16 Type() const = 0;
protected:
RecordRdata();
DISALLOW_COPY_AND_ASSIGN(RecordRdata);
};
// SRV record format (http://www.ietf.org/rfc/rfc2782.txt):
// 2 bytes network-order unsigned priority
// 2 bytes network-order unsigned weight
// 2 bytes network-order unsigned port
// target: domain name (on-the-wire representation)
class NET_EXPORT_PRIVATE SrvRecordRdata : public RecordRdata {
public:
static const uint16 kType = dns_protocol::kTypeSRV;
virtual ~SrvRecordRdata();
static scoped_ptr<SrvRecordRdata> Create(const base::StringPiece& data,
const DnsRecordParser& parser);
virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
virtual uint16 Type() const OVERRIDE;
uint16 priority() const { return priority_; }
uint16 weight() const { return weight_; }
uint16 port() const { return port_; }
const std::string& target() const { return target_; }
private:
SrvRecordRdata();
uint16 priority_;
uint16 weight_;
uint16 port_;
std::string target_;
DISALLOW_COPY_AND_ASSIGN(SrvRecordRdata);
};
// A Record format (http://www.ietf.org/rfc/rfc1035.txt):
// 4 bytes for IP address.
class NET_EXPORT_PRIVATE ARecordRdata : public RecordRdata {
public:
static const uint16 kType = dns_protocol::kTypeA;
virtual ~ARecordRdata();
static scoped_ptr<ARecordRdata> Create(const base::StringPiece& data,
const DnsRecordParser& parser);
virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
virtual uint16 Type() const OVERRIDE;
const IPAddressNumber& address() const { return address_; }
private:
ARecordRdata();
IPAddressNumber address_;
DISALLOW_COPY_AND_ASSIGN(ARecordRdata);
};
// AAAA Record format (http://www.ietf.org/rfc/rfc1035.txt):
// 16 bytes for IP address.
class NET_EXPORT_PRIVATE AAAARecordRdata : public RecordRdata {
public:
static const uint16 kType = dns_protocol::kTypeAAAA;
virtual ~AAAARecordRdata();
static scoped_ptr<AAAARecordRdata> Create(const base::StringPiece& data,
const DnsRecordParser& parser);
virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
virtual uint16 Type() const OVERRIDE;
const IPAddressNumber& address() const { return address_; }
private:
AAAARecordRdata();
IPAddressNumber address_;
DISALLOW_COPY_AND_ASSIGN(AAAARecordRdata);
};
// CNAME record format (http://www.ietf.org/rfc/rfc1035.txt):
// cname: On the wire representation of domain name.
class NET_EXPORT_PRIVATE CnameRecordRdata : public RecordRdata {
public:
static const uint16 kType = dns_protocol::kTypeCNAME;
virtual ~CnameRecordRdata();
static scoped_ptr<CnameRecordRdata> Create(const base::StringPiece& data,
const DnsRecordParser& parser);
virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
virtual uint16 Type() const OVERRIDE;
std::string cname() const { return cname_; }
private:
CnameRecordRdata();
std::string cname_;
DISALLOW_COPY_AND_ASSIGN(CnameRecordRdata);
};
// PTR record format (http://www.ietf.org/rfc/rfc1035.txt):
// domain: On the wire representation of domain name.
class NET_EXPORT_PRIVATE PtrRecordRdata : public RecordRdata {
public:
static const uint16 kType = dns_protocol::kTypePTR;
virtual ~PtrRecordRdata();
static scoped_ptr<PtrRecordRdata> Create(const base::StringPiece& data,
const DnsRecordParser& parser);
virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
virtual uint16 Type() const OVERRIDE;
std::string ptrdomain() const { return ptrdomain_; }
private:
PtrRecordRdata();
std::string ptrdomain_;
DISALLOW_COPY_AND_ASSIGN(PtrRecordRdata);
};
// TXT record format (http://www.ietf.org/rfc/rfc1035.txt):
// texts: One or more <character-string>s.
// a <character-string> is a length octet followed by as many characters.
class NET_EXPORT_PRIVATE TxtRecordRdata : public RecordRdata {
public:
static const uint16 kType = dns_protocol::kTypeTXT;
virtual ~TxtRecordRdata();
static scoped_ptr<TxtRecordRdata> Create(const base::StringPiece& data,
const DnsRecordParser& parser);
virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
virtual uint16 Type() const OVERRIDE;
const std::vector<std::string>& texts() const { return texts_; }
private:
TxtRecordRdata();
std::vector<std::string> texts_;
DISALLOW_COPY_AND_ASSIGN(TxtRecordRdata);
};
// Only the subset of the NSEC record format required by mDNS is supported.
// Nsec record format is described in http://www.ietf.org/rfc/rfc3845.txt and
// the limited version required for mDNS described in
// http://www.rfc-editor.org/rfc/rfc6762.txt Section 6.1.
class NET_EXPORT_PRIVATE NsecRecordRdata : public RecordRdata {
public:
static const uint16 kType = dns_protocol::kTypeNSEC;
virtual ~NsecRecordRdata();
static scoped_ptr<NsecRecordRdata> Create(const base::StringPiece& data,
const DnsRecordParser& parser);
virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
virtual uint16 Type() const OVERRIDE;
// Length of the bitmap in bits.
unsigned bitmap_length() const { return bitmap_.size() * 8; }
// Returns bit i-th bit in the bitmap, where bits withing a byte are organized
// most to least significant. If it is set, a record with rrtype i exists for
// the domain name of this nsec record.
bool GetBit(unsigned i) const;
private:
NsecRecordRdata();
std::vector<uint8> bitmap_;
DISALLOW_COPY_AND_ASSIGN(NsecRecordRdata);
};
} // namespace net
#endif // NET_DNS_RECORD_RDATA_H_
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