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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef NET_BASE_DNSRR_RESOLVER_H_ | 5 #ifndef NET_BASE_DNSRR_RESOLVER_H_ |
| 6 #define NET_BASE_DNSRR_RESOLVER_H_ | 6 #define NET_BASE_DNSRR_RESOLVER_H_ |
| 7 #pragma once | 7 #pragma once |
| 8 | 8 |
| 9 #include <map> | 9 #include <map> |
| 10 #include <string> | 10 #include <string> |
| 11 #include <utility> | 11 #include <utility> |
| 12 #include <vector> | 12 #include <vector> |
| 13 | 13 |
| 14 #include "base/basictypes.h" | 14 #include "base/basictypes.h" |
| 15 #include "base/ref_counted.h" | 15 #include "base/ref_counted.h" |
| 16 #include "base/threading/non_thread_safe.h" | 16 #include "base/threading/non_thread_safe.h" |
| 17 #include "base/time.h" | 17 #include "base/time.h" |
| 18 #include "build/build_config.h" | 18 #include "build/build_config.h" |
| 19 #include "net/base/completion_callback.h" | 19 #include "net/base/completion_callback.h" |
| 20 #include "net/base/network_change_notifier.h" | 20 #include "net/base/network_change_notifier.h" |
| 21 | 21 |
| 22 namespace net { | 22 namespace net { |
| 23 | 23 |
| 24 // RRResponse contains the result of a successful request for a resource record. | 24 // RRResponse contains the result of a successful request for a resource record. |
| 25 struct RRResponse { | 25 struct RRResponse { |
| 26 RRResponse(); | 26 RRResponse(); |
| 27 ~RRResponse(); | 27 ~RRResponse(); |
| 28 | 28 |
| 29 // HasExpired returns true if |fetch_time| + |ttl| is less than |
| 30 // |current_time|. |
| 31 bool HasExpired(base::Time current_time) const; |
| 32 |
| 33 // For testing only |
| 34 bool ParseFromResponse(const uint8* data, unsigned len, |
| 35 uint16 rrtype_requested); |
| 36 |
| 29 // name contains the canonical name of the resulting domain. If the queried | 37 // name contains the canonical name of the resulting domain. If the queried |
| 30 // name was a CNAME then this can differ. | 38 // name was a CNAME then this can differ. |
| 31 std::string name; | 39 std::string name; |
| 32 // ttl contains the TTL of the resource records. | 40 // ttl contains the TTL of the resource records. |
| 33 uint32 ttl; | 41 uint32 ttl; |
| 34 // dnssec is true if the response was DNSSEC validated. | 42 // dnssec is true if the response was DNSSEC validated. |
| 35 bool dnssec; | 43 bool dnssec; |
| 36 std::vector<std::string> rrdatas; | 44 std::vector<std::string> rrdatas; |
| 37 // sigs contains the RRSIG records returned. | 45 // sigs contains the RRSIG records returned. |
| 38 std::vector<std::string> signatures; | 46 std::vector<std::string> signatures; |
| 39 // fetch_time is the time at which the response was received from the | 47 // fetch_time is the time at which the response was received from the |
| 40 // network. | 48 // network. |
| 41 base::Time fetch_time; | 49 base::Time fetch_time; |
| 42 // negative is true if this is a negative cache entry, i.e. is a placeholder | 50 // negative is true if this is a negative cache entry, i.e. is a placeholder |
| 43 // to remember that a given RR doesn't exist. | 51 // to remember that a given RR doesn't exist. |
| 44 bool negative; | 52 bool negative; |
| 45 | |
| 46 // HasExpired returns true if |fetch_time| + |ttl| is less than | |
| 47 // |current_time|. | |
| 48 bool HasExpired(base::Time current_time) const; | |
| 49 | |
| 50 // For testing only | |
| 51 bool ParseFromResponse(const uint8* data, unsigned len, | |
| 52 uint16 rrtype_requested); | |
| 53 }; | 53 }; |
| 54 | 54 |
| 55 class BoundNetLog; | 55 class BoundNetLog; |
| 56 class RRResolverWorker; | 56 class RRResolverWorker; |
| 57 class RRResolverJob; | 57 class RRResolverJob; |
| 58 | 58 |
| 59 // DnsRRResolver resolves arbitary DNS resource record types. It should not be | 59 // DnsRRResolver resolves arbitary DNS resource record types. It should not be |
| 60 // confused with HostResolver and should not be used to resolve A/AAAA records. | 60 // confused with HostResolver and should not be used to resolve A/AAAA records. |
| 61 // | 61 // |
| 62 // HostResolver exists to lookup addresses and there are many details about | 62 // HostResolver exists to lookup addresses and there are many details about |
| 63 // address resolution over and above DNS (i.e. Bonjour, VPNs etc). | 63 // address resolution over and above DNS (i.e. Bonjour, VPNs etc). |
| 64 // | 64 // |
| 65 // DnsRRResolver should only be used when the data is specifically DNS data and | 65 // DnsRRResolver should only be used when the data is specifically DNS data and |
| 66 // the name is a fully qualified DNS domain. | 66 // the name is a fully qualified DNS domain. |
| 67 // | 67 // |
| 68 // A DnsRRResolver must be used from the MessageLoop which created it. | 68 // A DnsRRResolver must be used from the MessageLoop which created it. |
| 69 class DnsRRResolver : public base::NonThreadSafe, | 69 class DnsRRResolver : public base::NonThreadSafe, |
| 70 public NetworkChangeNotifier::Observer { | 70 public NetworkChangeNotifier::Observer { |
| 71 public: | 71 public: |
| 72 typedef intptr_t Handle; |
| 73 |
| 72 enum { | 74 enum { |
| 73 kInvalidHandle = 0, | 75 kInvalidHandle = 0, |
| 74 }; | 76 }; |
| 75 | 77 |
| 76 enum { | 78 enum { |
| 77 // Try harder to get a DNSSEC signed response. This doesn't mean that the | 79 // Try harder to get a DNSSEC signed response. This doesn't mean that the |
| 78 // RRResponse will always have the dnssec bit set. | 80 // RRResponse will always have the dnssec bit set. |
| 79 FLAG_WANT_DNSSEC = 1, | 81 FLAG_WANT_DNSSEC = 1, |
| 80 }; | 82 }; |
| 81 | 83 |
| 82 typedef intptr_t Handle; | |
| 83 | |
| 84 DnsRRResolver(); | 84 DnsRRResolver(); |
| 85 ~DnsRRResolver(); | 85 ~DnsRRResolver(); |
| 86 | 86 |
| 87 uint64 requests() const { return requests_; } | 87 uint64 requests() const { return requests_; } |
| 88 uint64 cache_hits() const { return cache_hits_; } | 88 uint64 cache_hits() const { return cache_hits_; } |
| 89 uint64 inflight_joins() const { return inflight_joins_; } | 89 uint64 inflight_joins() const { return inflight_joins_; } |
| 90 | 90 |
| 91 // Resolve starts the resolution process. When complete, |callback| is called | 91 // Resolve starts the resolution process. When complete, |callback| is called |
| 92 // with a result. If the result is |OK| then |response| is filled with the | 92 // with a result. If the result is |OK| then |response| is filled with the |
| 93 // result of the resolution. Note that |callback| is called via the current | 93 // result of the resolution. Note that |callback| is called via the current |
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| 127 uint64 inflight_joins_; | 127 uint64 inflight_joins_; |
| 128 | 128 |
| 129 bool in_destructor_; | 129 bool in_destructor_; |
| 130 | 130 |
| 131 DISALLOW_COPY_AND_ASSIGN(DnsRRResolver); | 131 DISALLOW_COPY_AND_ASSIGN(DnsRRResolver); |
| 132 }; | 132 }; |
| 133 | 133 |
| 134 } // namespace net | 134 } // namespace net |
| 135 | 135 |
| 136 #endif // NET_BASE_DNSRR_RESOLVER_H_ | 136 #endif // NET_BASE_DNSRR_RESOLVER_H_ |
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