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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 // Provides global database of differential decompression dictionaries for the | 5 // Provides global database of differential decompression dictionaries for the |
| 6 // SDCH filter (processes sdch enconded content). | 6 // SDCH filter (processes sdch enconded content). |
| 7 | 7 |
| 8 // Exactly one instance of SdchManager is built, and all references are made | 8 // Exactly one instance of SdchManager is built, and all references are made |
| 9 // into that collection. | 9 // into that collection. |
| 10 // | 10 // |
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| 42 // functionality in this base (when the functionaity can be provided). | 42 // functionality in this base (when the functionaity can be provided). |
| 43 class SdchFetcher { | 43 class SdchFetcher { |
| 44 public: | 44 public: |
| 45 SdchFetcher() {} | 45 SdchFetcher() {} |
| 46 virtual ~SdchFetcher() {} | 46 virtual ~SdchFetcher() {} |
| 47 | 47 |
| 48 // The Schedule() method is called when there is a need to get a dictionary | 48 // The Schedule() method is called when there is a need to get a dictionary |
| 49 // from a server. The callee is responsible for getting that dictionary_text, | 49 // from a server. The callee is responsible for getting that dictionary_text, |
| 50 // and then calling back to AddSdchDictionary() to the SdchManager instance. | 50 // and then calling back to AddSdchDictionary() to the SdchManager instance. |
| 51 virtual void Schedule(const GURL& dictionary_url) = 0; | 51 virtual void Schedule(const GURL& dictionary_url) = 0; |
| 52 |
| 52 private: | 53 private: |
| 53 DISALLOW_COPY_AND_ASSIGN(SdchFetcher); | 54 DISALLOW_COPY_AND_ASSIGN(SdchFetcher); |
| 54 }; | 55 }; |
| 55 | 56 |
| 56 //------------------------------------------------------------------------------ | 57 //------------------------------------------------------------------------------ |
| 57 | 58 |
| 58 class NET_EXPORT SdchManager : public NON_EXPORTED_BASE(base::NonThreadSafe) { | 59 class NET_EXPORT SdchManager : public NON_EXPORTED_BASE(base::NonThreadSafe) { |
| 59 public: | 60 public: |
| 60 // A list of errors that appeared and were either resolved, or used to turn | 61 // A list of errors that appeared and were either resolved, or used to turn |
| 61 // off sdch encoding. | 62 // off sdch encoding. |
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| 95 DICTIONARY_DOMAIN_NOT_MATCHING_SOURCE_URL = 24, | 96 DICTIONARY_DOMAIN_NOT_MATCHING_SOURCE_URL = 24, |
| 96 DICTIONARY_PORT_NOT_MATCHING_SOURCE_URL = 25, | 97 DICTIONARY_PORT_NOT_MATCHING_SOURCE_URL = 25, |
| 97 DICTIONARY_HAS_NO_TEXT = 26, | 98 DICTIONARY_HAS_NO_TEXT = 26, |
| 98 DICTIONARY_REFERER_URL_HAS_DOT_IN_PREFIX = 27, | 99 DICTIONARY_REFERER_URL_HAS_DOT_IN_PREFIX = 27, |
| 99 | 100 |
| 100 // Dictionary loading problems. | 101 // Dictionary loading problems. |
| 101 DICTIONARY_LOAD_ATTEMPT_FROM_DIFFERENT_HOST = 30, | 102 DICTIONARY_LOAD_ATTEMPT_FROM_DIFFERENT_HOST = 30, |
| 102 DICTIONARY_SELECTED_FOR_SSL = 31, | 103 DICTIONARY_SELECTED_FOR_SSL = 31, |
| 103 DICTIONARY_ALREADY_LOADED = 32, | 104 DICTIONARY_ALREADY_LOADED = 32, |
| 104 DICTIONARY_SELECTED_FROM_NON_HTTP = 33, | 105 DICTIONARY_SELECTED_FROM_NON_HTTP = 33, |
| 105 DICTIONARY_IS_TOO_LARGE= 34, | 106 DICTIONARY_IS_TOO_LARGE = 34, |
| 106 DICTIONARY_COUNT_EXCEEDED = 35, | 107 DICTIONARY_COUNT_EXCEEDED = 35, |
| 107 DICTIONARY_ALREADY_SCHEDULED_TO_DOWNLOAD = 36, | 108 DICTIONARY_ALREADY_SCHEDULED_TO_DOWNLOAD = 36, |
| 108 DICTIONARY_ALREADY_TRIED_TO_DOWNLOAD = 37, | 109 DICTIONARY_ALREADY_TRIED_TO_DOWNLOAD = 37, |
| 109 | 110 |
| 110 // Failsafe hack. | 111 // Failsafe hack. |
| 111 ATTEMPT_TO_DECODE_NON_HTTP_DATA = 40, | 112 ATTEMPT_TO_DECODE_NON_HTTP_DATA = 40, |
| 112 | 113 |
| 113 | |
| 114 // Content-Encoding problems detected, with no action taken. | 114 // Content-Encoding problems detected, with no action taken. |
| 115 MULTIENCODING_FOR_NON_SDCH_REQUEST = 50, | 115 MULTIENCODING_FOR_NON_SDCH_REQUEST = 50, |
| 116 SDCH_CONTENT_ENCODE_FOR_NON_SDCH_REQUEST = 51, | 116 SDCH_CONTENT_ENCODE_FOR_NON_SDCH_REQUEST = 51, |
| 117 | 117 |
| 118 // Dictionary manager issues. | 118 // Dictionary manager issues. |
| 119 DOMAIN_BLACKLIST_INCLUDES_TARGET = 61, | 119 DOMAIN_BLACKLIST_INCLUDES_TARGET = 61, |
| 120 | 120 |
| 121 // Problematic decode recovery methods. | 121 // Problematic decode recovery methods. |
| 122 META_REFRESH_RECOVERY = 70, // Dictionary not found. | 122 META_REFRESH_RECOVERY = 70, // Dictionary not found. |
| 123 // defunct = 71, // Almost the same as META_REFRESH_UNSUPPORTED. | 123 // defunct = 71, // Almost the same as META_REFRESH_UNSUPPORTED. |
| 124 // defunct = 72, // Almost the same as CACHED_META_REFRESH_UNSUPPORTED. | 124 // defunct = 72, // Almost the same as CACHED_META_REFRESH_UNSUPPORTED. |
| 125 // defunct = 73, // PASSING_THROUGH_NON_SDCH plus DISCARD_TENTATIVE_SDCH. | 125 // defunct = 73, // PASSING_THROUGH_NON_SDCH plus DISCARD_TENTATIVE_SDCH. |
| 126 META_REFRESH_UNSUPPORTED = 74, // Unrecoverable error. | 126 META_REFRESH_UNSUPPORTED = 74, // Unrecoverable error. |
| 127 CACHED_META_REFRESH_UNSUPPORTED = 75, // As above, but pulled from cache. | 127 CACHED_META_REFRESH_UNSUPPORTED = 75, // As above, but pulled from cache. |
| 128 PASSING_THROUGH_NON_SDCH = 76, // Tagged sdch but missing dictionary-hash. | 128 PASSING_THROUGH_NON_SDCH = 76, // Tagged sdch but missing dictionary-hash. |
| 129 INCOMPLETE_SDCH_CONTENT = 77, // Last window was not completely decoded. | 129 INCOMPLETE_SDCH_CONTENT = 77, // Last window was not completely decoded. |
| 130 PASS_THROUGH_404_CODE = 78, // URL not found message passing through. | 130 PASS_THROUGH_404_CODE = 78, // URL not found message passing through. |
| 131 | 131 |
| 132 // This next report is very common, and not really an error scenario, but | 132 // This next report is very common, and not really an error scenario, but |
| 133 // it exercises the error recovery logic. | 133 // it exercises the error recovery logic. |
| 134 PASS_THROUGH_OLD_CACHED = 79, // Back button got pre-SDCH cached content. | 134 PASS_THROUGH_OLD_CACHED = 79, // Back button got pre-SDCH cached content. |
| 135 | 135 |
| 136 // Common decoded recovery methods. | 136 // Common decoded recovery methods. |
| 137 META_REFRESH_CACHED_RECOVERY = 80, // Probably startup tab loading. | 137 META_REFRESH_CACHED_RECOVERY = 80, // Probably startup tab loading. |
| 138 DISCARD_TENTATIVE_SDCH = 81, // Server decided not to use sdch. | 138 DISCARD_TENTATIVE_SDCH = 81, // Server decided not to use sdch. |
| 139 | 139 |
| 140 // Non SDCH problems, only accounted for to make stat counting complete | 140 // Non SDCH problems, only accounted for to make stat counting complete |
| 141 // (i.e., be able to be sure all dictionary advertisements are accounted | 141 // (i.e., be able to be sure all dictionary advertisements are accounted |
| 142 // for). | 142 // for). |
| 143 | 143 UNFLUSHED_CONTENT = 90, // Possible error in filter chaining. |
| 144 UNFLUSHED_CONTENT = 90, // Possible error in filter chaining. | |
| 145 // defunct = 91, // MISSING_TIME_STATS (Should never happen.) | 144 // defunct = 91, // MISSING_TIME_STATS (Should never happen.) |
| 146 CACHE_DECODED = 92, // No timing stats recorded. | 145 CACHE_DECODED = 92, // No timing stats recorded. |
| 147 // defunct = 93, // OVER_10_MINUTES (No timing stats recorded.) | 146 // defunct = 93, // OVER_10_MINUTES (No timing stats recorded.) |
| 148 UNINITIALIZED = 94, // Filter never even got initialized. | 147 UNINITIALIZED = 94, // Filter never even got initialized. |
| 149 PRIOR_TO_DICTIONARY = 95, // We hadn't even parsed a dictionary selector. | 148 PRIOR_TO_DICTIONARY = 95, // We hadn't even parsed a dictionary selector. |
| 150 DECODE_ERROR = 96, // Something went wrong during decode. | 149 DECODE_ERROR = 96, // Something went wrong during decode. |
| 151 | 150 |
| 152 // Problem during the latency test. | 151 // Problem during the latency test. |
| 153 LATENCY_TEST_DISALLOWED = 100, // SDCH now failing, but it worked before! | 152 LATENCY_TEST_DISALLOWED = 100, // SDCH now failing, but it worked before! |
| 154 | 153 MAX_PROBLEM_CODE // Used to bound histogram. |
| 155 MAX_PROBLEM_CODE // Used to bound histogram. | |
| 156 }; | 154 }; |
| 157 | 155 |
| 158 // Use the following static limits to block DOS attacks until we implement | 156 // Use the following static limits to block DOS attacks until we implement |
| 159 // a cached dictionary evicition strategy. | 157 // a cached dictionary evicition strategy. |
| 160 static const size_t kMaxDictionarySize; | 158 static const size_t kMaxDictionarySize; |
| 161 static const size_t kMaxDictionaryCount; | 159 static const size_t kMaxDictionaryCount; |
| 162 | 160 |
| 163 // There is one instance of |Dictionary| for each memory-cached SDCH | 161 // There is one instance of |Dictionary| for each memory-cached SDCH |
| 164 // dictionary. | 162 // dictionary. |
| 165 class NET_EXPORT_PRIVATE Dictionary : public base::RefCounted<Dictionary> { | 163 class NET_EXPORT_PRIVATE Dictionary : public base::RefCounted<Dictionary> { |
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| 187 | 185 |
| 188 const GURL& url() const { return url_; } | 186 const GURL& url() const { return url_; } |
| 189 const std::string& client_hash() const { return client_hash_; } | 187 const std::string& client_hash() const { return client_hash_; } |
| 190 | 188 |
| 191 // Security method to check if we can advertise this dictionary for use | 189 // Security method to check if we can advertise this dictionary for use |
| 192 // if the |target_url| returns SDCH compressed data. | 190 // if the |target_url| returns SDCH compressed data. |
| 193 bool CanAdvertise(const GURL& target_url); | 191 bool CanAdvertise(const GURL& target_url); |
| 194 | 192 |
| 195 // Security methods to check if we can establish a new dictionary with the | 193 // Security methods to check if we can establish a new dictionary with the |
| 196 // given data, that arrived in response to get of dictionary_url. | 194 // given data, that arrived in response to get of dictionary_url. |
| 197 static bool CanSet(const std::string& domain, const std::string& path, | 195 static bool CanSet(const std::string& domain, |
| 198 const std::set<int>& ports, const GURL& dictionary_url); | 196 const std::string& path, |
| 197 const std::set<int>& ports, |
| 198 const GURL& dictionary_url); |
| 199 | 199 |
| 200 // Security method to check if we can use a dictionary to decompress a | 200 // Security method to check if we can use a dictionary to decompress a |
| 201 // target that arrived with a reference to this dictionary. | 201 // target that arrived with a reference to this dictionary. |
| 202 bool CanUse(const GURL& referring_url); | 202 bool CanUse(const GURL& referring_url); |
| 203 | 203 |
| 204 // Compare paths to see if they "match" for dictionary use. | 204 // Compare paths to see if they "match" for dictionary use. |
| 205 static bool PathMatch(const std::string& path, | 205 static bool PathMatch(const std::string& path, |
| 206 const std::string& restriction); | 206 const std::string& restriction); |
| 207 | 207 |
| 208 // Compare domains to see if the "match" for dictionary use. | 208 // Compare domains to see if the "match" for dictionary use. |
| 209 static bool DomainMatch(const GURL& url, const std::string& restriction); | 209 static bool DomainMatch(const GURL& url, const std::string& restriction); |
| 210 | 210 |
| 211 | |
| 212 // The actual text of the dictionary. | 211 // The actual text of the dictionary. |
| 213 std::string text_; | 212 std::string text_; |
| 214 | 213 |
| 215 // Part of the hash of text_ that the client uses to advertise the fact that | 214 // Part of the hash of text_ that the client uses to advertise the fact that |
| 216 // it has a specific dictionary pre-cached. | 215 // it has a specific dictionary pre-cached. |
| 217 std::string client_hash_; | 216 std::string client_hash_; |
| 218 | 217 |
| 219 // The GURL that arrived with the text_ in a URL request to specify where | 218 // The GURL that arrived with the text_ in a URL request to specify where |
| 220 // this dictionary may be used. | 219 // this dictionary may be used. |
| 221 const GURL url_; | 220 const GURL url_; |
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| 319 | 318 |
| 320 // Get list of available (pre-cached) dictionaries that we have already loaded | 319 // Get list of available (pre-cached) dictionaries that we have already loaded |
| 321 // into memory. The list is a comma separated list of (client) hashes per | 320 // into memory. The list is a comma separated list of (client) hashes per |
| 322 // the SDCH spec. | 321 // the SDCH spec. |
| 323 void GetAvailDictionaryList(const GURL& target_url, std::string* list); | 322 void GetAvailDictionaryList(const GURL& target_url, std::string* list); |
| 324 | 323 |
| 325 // Construct the pair of hashes for client and server to identify an SDCH | 324 // Construct the pair of hashes for client and server to identify an SDCH |
| 326 // dictionary. This is only made public to facilitate unit testing, but is | 325 // dictionary. This is only made public to facilitate unit testing, but is |
| 327 // otherwise private | 326 // otherwise private |
| 328 static void GenerateHash(const std::string& dictionary_text, | 327 static void GenerateHash(const std::string& dictionary_text, |
| 329 std::string* client_hash, std::string* server_hash); | 328 std::string* client_hash, |
| 329 std::string* server_hash); |
| 330 | 330 |
| 331 // For Latency testing only, we need to know if we've succeeded in doing a | 331 // For Latency testing only, we need to know if we've succeeded in doing a |
| 332 // round trip before starting our comparative tests. If ever we encounter | 332 // round trip before starting our comparative tests. If ever we encounter |
| 333 // problems with SDCH, we opt-out of the test unless/until we perform a | 333 // problems with SDCH, we opt-out of the test unless/until we perform a |
| 334 // complete SDCH decoding. | 334 // complete SDCH decoding. |
| 335 bool AllowLatencyExperiment(const GURL& url) const; | 335 bool AllowLatencyExperiment(const GURL& url) const; |
| 336 | 336 |
| 337 void SetAllowLatencyExperiment(const GURL& url, bool enable); | 337 void SetAllowLatencyExperiment(const GURL& url, bool enable); |
| 338 | 338 |
| 339 private: | 339 private: |
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| 372 // List of hostnames for which a latency experiment is allowed (because a | 372 // List of hostnames for which a latency experiment is allowed (because a |
| 373 // round trip test has recently passed). | 373 // round trip test has recently passed). |
| 374 ExperimentSet allow_latency_experiment_; | 374 ExperimentSet allow_latency_experiment_; |
| 375 | 375 |
| 376 DISALLOW_COPY_AND_ASSIGN(SdchManager); | 376 DISALLOW_COPY_AND_ASSIGN(SdchManager); |
| 377 }; | 377 }; |
| 378 | 378 |
| 379 } // namespace net | 379 } // namespace net |
| 380 | 380 |
| 381 #endif // NET_BASE_SDCH_MANAGER_H_ | 381 #endif // NET_BASE_SDCH_MANAGER_H_ |
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