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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2013 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_DNS_MDNS_CACHE_H_ | 5 #ifndef NET_DNS_MDNS_CACHE_H_ |
| 6 #define NET_DNS_MDNS_CACHE_H_ | 6 #define NET_DNS_MDNS_CACHE_H_ |
| 7 | 7 |
| 8 #include <map> | 8 #include <map> |
| 9 #include <string> | 9 #include <string> |
| 10 #include <vector> | 10 #include <vector> |
| (...skipping 21 matching lines...) Expand all Loading... |
| 32 class Key { | 32 class Key { |
| 33 public: | 33 public: |
| 34 Key(unsigned type, const std::string& name, const std::string& optional); | 34 Key(unsigned type, const std::string& name, const std::string& optional); |
| 35 Key(const Key&); | 35 Key(const Key&); |
| 36 Key& operator=(const Key&); | 36 Key& operator=(const Key&); |
| 37 ~Key(); | 37 ~Key(); |
| 38 bool operator<(const Key& key) const; | 38 bool operator<(const Key& key) const; |
| 39 bool operator==(const Key& key) const; | 39 bool operator==(const Key& key) const; |
| 40 | 40 |
| 41 unsigned type() const { return type_; } | 41 unsigned type() const { return type_; } |
| 42 const std::string& name() const { return name_; } | 42 const std::string& name() const { return name_; } |
| 43 const std::string& optional() const { return optional_; } | 43 const std::string& optional() const { return optional_; } |
| 44 | 44 |
| 45 // Create the cache key corresponding to |record|. | 45 // Create the cache key corresponding to |record|. |
| 46 static Key CreateFor(const RecordParsed* record); | 46 static Key CreateFor(const RecordParsed* record); |
| 47 |
| 47 private: | 48 private: |
| 48 unsigned type_; | 49 unsigned type_; |
| 49 std::string name_; | 50 std::string name_; |
| 50 std::string optional_; | 51 std::string optional_; |
| 51 }; | 52 }; |
| 52 | 53 |
| 53 typedef base::Callback<void(const RecordParsed*)> RecordRemovedCallback; | 54 typedef base::Callback<void(const RecordParsed*)> RecordRemovedCallback; |
| 54 | 55 |
| 55 enum UpdateType { | 56 enum UpdateType { RecordAdded, RecordChanged, RecordRemoved, NoChange }; |
| 56 RecordAdded, | |
| 57 RecordChanged, | |
| 58 RecordRemoved, | |
| 59 NoChange | |
| 60 }; | |
| 61 | 57 |
| 62 MDnsCache(); | 58 MDnsCache(); |
| 63 ~MDnsCache(); | 59 ~MDnsCache(); |
| 64 | 60 |
| 65 // Return value indicates whether the record was added, changed | 61 // Return value indicates whether the record was added, changed |
| 66 // (existed previously with different value) or not changed (existed | 62 // (existed previously with different value) or not changed (existed |
| 67 // previously with same value). | 63 // previously with same value). |
| 68 UpdateType UpdateDnsRecord(scoped_ptr<const RecordParsed> record); | 64 UpdateType UpdateDnsRecord(scoped_ptr<const RecordParsed> record); |
| 69 | 65 |
| 70 // Check cache for record with key |key|. Return the record if it exists, or | 66 // Check cache for record with key |key|. Return the record if it exists, or |
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| 98 typedef std::map<Key, const RecordParsed*> RecordMap; | 94 typedef std::map<Key, const RecordParsed*> RecordMap; |
| 99 | 95 |
| 100 // Get the effective expiration of a cache entry, based on its creation time | 96 // Get the effective expiration of a cache entry, based on its creation time |
| 101 // and TTL. Does adjustments so entries with a TTL of zero will have a | 97 // and TTL. Does adjustments so entries with a TTL of zero will have a |
| 102 // nonzero TTL, as explained in RFC 6762 Section 10.1. | 98 // nonzero TTL, as explained in RFC 6762 Section 10.1. |
| 103 static base::Time GetEffectiveExpiration(const RecordParsed* entry); | 99 static base::Time GetEffectiveExpiration(const RecordParsed* entry); |
| 104 | 100 |
| 105 // Get optional part of the DNS key for shared records. For example, in PTR | 101 // Get optional part of the DNS key for shared records. For example, in PTR |
| 106 // records this is the pointed domain, since multiple PTR records may exist | 102 // records this is the pointed domain, since multiple PTR records may exist |
| 107 // for the same name. | 103 // for the same name. |
| 108 static std::string GetOptionalFieldForRecord( | 104 static std::string GetOptionalFieldForRecord(const RecordParsed* record); |
| 109 const RecordParsed* record); | |
| 110 | 105 |
| 111 RecordMap mdns_cache_; | 106 RecordMap mdns_cache_; |
| 112 | 107 |
| 113 base::Time next_expiration_; | 108 base::Time next_expiration_; |
| 114 | 109 |
| 115 DISALLOW_COPY_AND_ASSIGN(MDnsCache); | 110 DISALLOW_COPY_AND_ASSIGN(MDnsCache); |
| 116 }; | 111 }; |
| 117 | 112 |
| 118 } // namespace net | 113 } // namespace net |
| 119 | 114 |
| 120 #endif // NET_DNS_MDNS_CACHE_H_ | 115 #endif // NET_DNS_MDNS_CACHE_H_ |
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