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85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DNS_DNS_TRANSACTION_H_
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#define NET_DNS_DNS_TRANSACTION_H_
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#include <stdint.h>
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#include <memory>
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#include <string>
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#include "base/callback_forward.h"
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#include "base/compiler_specific.h"
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#include "net/base/net_export.h"
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#include "net/dns/record_rdata.h"
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namespace net {
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class DnsResponse;
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class DnsSession;
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class NetLogWithSource;
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// DnsTransaction implements a stub DNS resolver as defined in RFC 1034.
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// The DnsTransaction takes care of retransmissions, name server fallback (or
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// round-robin), suffix search, and simple response validation ("does it match
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// the query") to fight poisoning.
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//
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// Destroying DnsTransaction cancels the underlying network effort.
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class NET_EXPORT_PRIVATE DnsTransaction {
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public:
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virtual ~DnsTransaction() {}
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// Returns the original |hostname|.
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virtual const std::string& GetHostname() const = 0;
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// Returns the |qtype|.
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virtual uint16_t GetType() const = 0;
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// Starts the transaction. Always completes asynchronously.
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virtual void Start() = 0;
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};
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// Creates DnsTransaction which performs asynchronous DNS search.
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// It does NOT perform caching, aggregation or prioritization of transactions.
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//
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// Destroying the factory does NOT affect any already created DnsTransactions.
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class NET_EXPORT_PRIVATE DnsTransactionFactory {
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public:
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// Called with the response or NULL if no matching response was received.
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// Note that the |GetDottedName()| of the response may be different than the
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// original |hostname| as a result of suffix search.
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typedef base::Callback<void(DnsTransaction* transaction,
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int neterror,
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const DnsResponse* response)> CallbackType;
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virtual ~DnsTransactionFactory() {}
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// Creates DnsTransaction for the given |hostname| and |qtype| (assuming
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// QCLASS is IN). |hostname| should be in the dotted form. A dot at the end
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// implies the domain name is fully-qualified and will be exempt from suffix
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// search. |hostname| should not be an IP literal.
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//
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// The transaction will run |callback| upon asynchronous completion.
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// The |net_log| is used as the parent log.
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virtual std::unique_ptr<DnsTransaction> CreateTransaction(
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const std::string& hostname,
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uint16_t qtype,
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const CallbackType& callback,
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const NetLogWithSource& net_log) WARN_UNUSED_RESULT = 0;
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// The given EDNS0 option will be included in all DNS queries performed by
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// transactions from this factory.
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virtual void AddEDNSOption(const OptRecordRdata::Opt& opt) = 0;
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// Creates a DnsTransactionFactory which creates DnsTransactionImpl using the
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// |session|.
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static std::unique_ptr<DnsTransactionFactory> CreateFactory(
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DnsSession* session) WARN_UNUSED_RESULT;
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};
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} // namespace net
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#endif // NET_DNS_DNS_TRANSACTION_H_
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