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1 : : // Copyright (c) 2021-2022 The Bitcoin Core developers
2 : : // Distributed under the MIT software license, see the accompanying
3 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 : :
5 : : #ifndef BITCOIN_ADDRMAN_IMPL_H
6 : : #define BITCOIN_ADDRMAN_IMPL_H
7 : :
8 : : #include <logging.h>
9 : : #include <logging/timer.h>
10 : : #include <netaddress.h>
11 : : #include <protocol.h>
12 : : #include <serialize.h>
13 : : #include <sync.h>
14 : : #include <uint256.h>
15 : : #include <util/time.h>
16 : :
17 : : #include <cstdint>
18 : : #include <optional>
19 : : #include <set>
20 : : #include <unordered_map>
21 : : #include <unordered_set>
22 : : #include <utility>
23 : : #include <vector>
24 : :
25 : : /** Total number of buckets for tried addresses */
26 : : static constexpr int32_t ADDRMAN_TRIED_BUCKET_COUNT_LOG2{8};
27 : : static constexpr int ADDRMAN_TRIED_BUCKET_COUNT{1 << ADDRMAN_TRIED_BUCKET_COUNT_LOG2};
28 : : /** Total number of buckets for new addresses */
29 : : static constexpr int32_t ADDRMAN_NEW_BUCKET_COUNT_LOG2{10};
30 : : static constexpr int ADDRMAN_NEW_BUCKET_COUNT{1 << ADDRMAN_NEW_BUCKET_COUNT_LOG2};
31 : : /** Maximum allowed number of entries in buckets for new and tried addresses */
32 : : static constexpr int32_t ADDRMAN_BUCKET_SIZE_LOG2{6};
33 : : static constexpr int ADDRMAN_BUCKET_SIZE{1 << ADDRMAN_BUCKET_SIZE_LOG2};
34 : :
35 : : /**
36 : : * User-defined type for the internally used nIds
37 : : * This used to be int, making it feasible for attackers to cause an overflow,
38 : : * see https://bitcoincore.org/en/2024/07/31/disclose-addrman-int-overflow/
39 : : */
40 : : using nid_type = int64_t;
41 : :
42 : : /**
43 : : * Extended statistics about a CAddress
44 : : */
45 : 41603154 : class AddrInfo : public CAddress
46 : : {
47 : : public:
48 : : //! last try whatsoever by us (memory only)
49 : : NodeSeconds m_last_try{0s};
50 : :
51 : : //! last counted attempt (memory only)
52 : : NodeSeconds m_last_count_attempt{0s};
53 : :
54 : : //! where knowledge about this address first came from
55 : : CNetAddr source;
56 : :
57 : : //! last successful connection by us
58 : : NodeSeconds m_last_success{0s};
59 : :
60 : : //! connection attempts since last successful attempt
61 : : int nAttempts{0};
62 : :
63 : : //! reference count in new sets (memory only)
64 : : int nRefCount{0};
65 : :
66 : : //! in tried set? (memory only)
67 : : bool fInTried{false};
68 : :
69 : : //! position in vRandom
70 : : mutable int nRandomPos{-1};
71 : :
72 : 20744897 : SERIALIZE_METHODS(AddrInfo, obj)
73 : : {
74 : 13692654 : READWRITE(AsBase<CAddress>(obj), obj.source, Using<ChronoFormatter<int64_t>>(obj.m_last_success), obj.nAttempts);
75 : 13691436 : }
76 : :
77 : 9512761 : AddrInfo(const CAddress &addrIn, const CNetAddr &addrSource) : CAddress(addrIn), source(addrSource)
78 : : {
79 : 9512761 : }
80 : :
81 [ + - ]: 19322226 : AddrInfo() : CAddress(), source()
82 : : {
83 : 19322226 : }
84 : :
85 : : //! Calculate in which "tried" bucket this entry belongs
86 : : int GetTriedBucket(const uint256& nKey, const NetGroupManager& netgroupman) const;
87 : :
88 : : //! Calculate in which "new" bucket this entry belongs, given a certain source
89 : : int GetNewBucket(const uint256& nKey, const CNetAddr& src, const NetGroupManager& netgroupman) const;
90 : :
91 : : //! Calculate in which "new" bucket this entry belongs, using its default source
92 : 3419586 : int GetNewBucket(const uint256& nKey, const NetGroupManager& netgroupman) const
93 : : {
94 [ + - + - : 3419586 : return GetNewBucket(nKey, source, netgroupman);
- - - - ]
95 : : }
96 : :
97 : : //! Calculate in which position of a bucket to store this entry.
98 : : int GetBucketPosition(const uint256 &nKey, bool fNew, int bucket) const;
99 : :
100 : : //! Determine whether the statistics about this entry are bad enough so that it can just be deleted
101 : : bool IsTerrible(NodeSeconds now = Now<NodeSeconds>()) const;
102 : :
103 : : //! Calculate the relative chance this entry should be given when selecting nodes to connect to
104 : : double GetChance(NodeSeconds now = Now<NodeSeconds>()) const;
105 : : };
106 : :
107 : : class AddrManImpl
108 : : {
109 : : public:
110 : : AddrManImpl(const NetGroupManager& netgroupman, bool deterministic, int32_t consistency_check_ratio);
111 : :
112 : : ~AddrManImpl();
113 : :
114 : : template <typename Stream>
115 : : void Serialize(Stream& s_) const EXCLUSIVE_LOCKS_REQUIRED(!cs);
116 : :
117 : : template <typename Stream>
118 : : void Unserialize(Stream& s_) EXCLUSIVE_LOCKS_REQUIRED(!cs);
119 : :
120 : : size_t Size(std::optional<Network> net, std::optional<bool> in_new) const EXCLUSIVE_LOCKS_REQUIRED(!cs);
121 : :
122 : : bool Add(const std::vector<CAddress>& vAddr, const CNetAddr& source, std::chrono::seconds time_penalty)
123 : : EXCLUSIVE_LOCKS_REQUIRED(!cs);
124 : :
125 : : bool Good(const CService& addr, NodeSeconds time)
126 : : EXCLUSIVE_LOCKS_REQUIRED(!cs);
127 : :
128 : : void Attempt(const CService& addr, bool fCountFailure, NodeSeconds time)
129 : : EXCLUSIVE_LOCKS_REQUIRED(!cs);
130 : :
131 : : void ResolveCollisions() EXCLUSIVE_LOCKS_REQUIRED(!cs);
132 : :
133 : : std::pair<CAddress, NodeSeconds> SelectTriedCollision() EXCLUSIVE_LOCKS_REQUIRED(!cs);
134 : :
135 : : std::pair<CAddress, NodeSeconds> Select(bool new_only, const std::unordered_set<Network>& networks) const
136 : : EXCLUSIVE_LOCKS_REQUIRED(!cs);
137 : :
138 : : std::vector<CAddress> GetAddr(size_t max_addresses, size_t max_pct, std::optional<Network> network, const bool filtered = true) const
139 : : EXCLUSIVE_LOCKS_REQUIRED(!cs);
140 : :
141 : : std::vector<std::pair<AddrInfo, AddressPosition>> GetEntries(bool from_tried) const
142 : : EXCLUSIVE_LOCKS_REQUIRED(!cs);
143 : :
144 : : void Connected(const CService& addr, NodeSeconds time)
145 : : EXCLUSIVE_LOCKS_REQUIRED(!cs);
146 : :
147 : : void SetServices(const CService& addr, ServiceFlags nServices)
148 : : EXCLUSIVE_LOCKS_REQUIRED(!cs);
149 : :
150 : : std::optional<AddressPosition> FindAddressEntry(const CAddress& addr)
151 : : EXCLUSIVE_LOCKS_REQUIRED(!cs);
152 : :
153 : : friend class AddrManDeterministic;
154 : :
155 : : private:
156 : : //! A mutex to protect the inner data structures.
157 : : mutable Mutex cs;
158 : :
159 : : //! Source of random numbers for randomization in inner loops
160 : : mutable FastRandomContext insecure_rand GUARDED_BY(cs);
161 : :
162 : : //! secret key to randomize bucket select with
163 : : uint256 nKey;
164 : :
165 : : //! Serialization versions.
166 : : enum Format : uint8_t {
167 : : V0_HISTORICAL = 0, //!< historic format, before commit e6b343d88
168 : : V1_DETERMINISTIC = 1, //!< for pre-asmap files
169 : : V2_ASMAP = 2, //!< for files including asmap version
170 : : V3_BIP155 = 3, //!< same as V2_ASMAP plus addresses are in BIP155 format
171 : : V4_MULTIPORT = 4, //!< adds support for multiple ports per IP
172 : : };
173 : :
174 : : //! The maximum format this software knows it can unserialize. Also, we always serialize
175 : : //! in this format.
176 : : //! The format (first byte in the serialized stream) can be higher than this and
177 : : //! still this software may be able to unserialize the file - if the second byte
178 : : //! (see `lowest_compatible` in `Unserialize()`) is less or equal to this.
179 : : static constexpr Format FILE_FORMAT = Format::V4_MULTIPORT;
180 : :
181 : : //! The initial value of a field that is incremented every time an incompatible format
182 : : //! change is made (such that old software versions would not be able to parse and
183 : : //! understand the new file format). This is 32 because we overtook the "key size"
184 : : //! field which was 32 historically.
185 : : //! @note Don't increment this. Increment `lowest_compatible` in `Serialize()` instead.
186 : : static constexpr uint8_t INCOMPATIBILITY_BASE = 32;
187 : :
188 : : //! last used nId
189 : : nid_type nIdCount GUARDED_BY(cs){0};
190 : :
191 : : //! table with information about all nIds
192 : : std::unordered_map<nid_type, AddrInfo> mapInfo GUARDED_BY(cs);
193 : :
194 : : //! find an nId based on its network address and port.
195 : : std::unordered_map<CService, nid_type, CServiceHash> mapAddr GUARDED_BY(cs);
196 : :
197 : : //! randomly-ordered vector of all nIds
198 : : //! This is mutable because it is unobservable outside the class, so any
199 : : //! changes to it (even in const methods) are also unobservable.
200 : : mutable std::vector<nid_type> vRandom GUARDED_BY(cs);
201 : :
202 : : // number of "tried" entries
203 : : int nTried GUARDED_BY(cs){0};
204 : :
205 : : //! list of "tried" buckets
206 : : nid_type vvTried[ADDRMAN_TRIED_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE] GUARDED_BY(cs);
207 : :
208 : : //! number of (unique) "new" entries
209 : : int nNew GUARDED_BY(cs){0};
210 : :
211 : : //! list of "new" buckets
212 : : nid_type vvNew[ADDRMAN_NEW_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE] GUARDED_BY(cs);
213 : :
214 : : //! last time Good was called (memory only). Initially set to 1 so that "never" is strictly worse.
215 : : NodeSeconds m_last_good GUARDED_BY(cs){1s};
216 : :
217 : : //! Holds addrs inserted into tried table that collide with existing entries. Test-before-evict discipline used to resolve these collisions.
218 : : std::set<nid_type> m_tried_collisions;
219 : :
220 : : /** Perform consistency checks every m_consistency_check_ratio operations (if non-zero). */
221 : : const int32_t m_consistency_check_ratio;
222 : :
223 : : /** Reference to the netgroup manager. netgroupman must be constructed before addrman and destructed after. */
224 : : const NetGroupManager& m_netgroupman;
225 : :
226 : : struct NewTriedCount {
227 : : size_t n_new;
228 : : size_t n_tried;
229 : : };
230 : :
231 : : /** Number of entries in addrman per network and new/tried table. */
232 : : std::unordered_map<Network, NewTriedCount> m_network_counts GUARDED_BY(cs);
233 : :
234 : : //! Find an entry.
235 : : AddrInfo* Find(const CService& addr, nid_type* pnId = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs);
236 : :
237 : : //! Create a new entry and add it to the internal data structures mapInfo, mapAddr and vRandom.
238 : : AddrInfo* Create(const CAddress& addr, const CNetAddr& addrSource, nid_type* pnId = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs);
239 : :
240 : : //! Swap two elements in vRandom.
241 : : void SwapRandom(unsigned int nRandomPos1, unsigned int nRandomPos2) const EXCLUSIVE_LOCKS_REQUIRED(cs);
242 : :
243 : : //! Delete an entry. It must not be in tried, and have refcount 0.
244 : : void Delete(nid_type nId) EXCLUSIVE_LOCKS_REQUIRED(cs);
245 : :
246 : : //! Clear a position in a "new" table. This is the only place where entries are actually deleted.
247 : : void ClearNew(int nUBucket, int nUBucketPos) EXCLUSIVE_LOCKS_REQUIRED(cs);
248 : :
249 : : //! Move an entry from the "new" table(s) to the "tried" table
250 : : void MakeTried(AddrInfo& info, nid_type nId) EXCLUSIVE_LOCKS_REQUIRED(cs);
251 : :
252 : : /** Attempt to add a single address to addrman's new table.
253 : : * @see AddrMan::Add() for parameters. */
254 : : bool AddSingle(const CAddress& addr, const CNetAddr& source, std::chrono::seconds time_penalty) EXCLUSIVE_LOCKS_REQUIRED(cs);
255 : :
256 : : bool Good_(const CService& addr, bool test_before_evict, NodeSeconds time) EXCLUSIVE_LOCKS_REQUIRED(cs);
257 : :
258 : : bool Add_(const std::vector<CAddress>& vAddr, const CNetAddr& source, std::chrono::seconds time_penalty) EXCLUSIVE_LOCKS_REQUIRED(cs);
259 : :
260 : : void Attempt_(const CService& addr, bool fCountFailure, NodeSeconds time) EXCLUSIVE_LOCKS_REQUIRED(cs);
261 : :
262 : : std::pair<CAddress, NodeSeconds> Select_(bool new_only, const std::unordered_set<Network>& networks) const EXCLUSIVE_LOCKS_REQUIRED(cs);
263 : :
264 : : /** Helper to generalize looking up an addrman entry from either table.
265 : : *
266 : : * @return nid_type The nid of the entry. If the addrman position is empty or not found, returns -1.
267 : : * */
268 : : nid_type GetEntry(bool use_tried, size_t bucket, size_t position) const EXCLUSIVE_LOCKS_REQUIRED(cs);
269 : :
270 : : std::vector<CAddress> GetAddr_(size_t max_addresses, size_t max_pct, std::optional<Network> network, const bool filtered = true) const EXCLUSIVE_LOCKS_REQUIRED(cs);
271 : :
272 : : std::vector<std::pair<AddrInfo, AddressPosition>> GetEntries_(bool from_tried) const EXCLUSIVE_LOCKS_REQUIRED(cs);
273 : :
274 : : void Connected_(const CService& addr, NodeSeconds time) EXCLUSIVE_LOCKS_REQUIRED(cs);
275 : :
276 : : void SetServices_(const CService& addr, ServiceFlags nServices) EXCLUSIVE_LOCKS_REQUIRED(cs);
277 : :
278 : : void ResolveCollisions_() EXCLUSIVE_LOCKS_REQUIRED(cs);
279 : :
280 : : std::pair<CAddress, NodeSeconds> SelectTriedCollision_() EXCLUSIVE_LOCKS_REQUIRED(cs);
281 : :
282 : : std::optional<AddressPosition> FindAddressEntry_(const CAddress& addr) EXCLUSIVE_LOCKS_REQUIRED(cs);
283 : :
284 : : size_t Size_(std::optional<Network> net, std::optional<bool> in_new) const EXCLUSIVE_LOCKS_REQUIRED(cs);
285 : :
286 : : //! Consistency check, taking into account m_consistency_check_ratio.
287 : : //! Will std::abort if an inconsistency is detected.
288 : : void Check() const EXCLUSIVE_LOCKS_REQUIRED(cs);
289 : :
290 : : //! Perform consistency check, regardless of m_consistency_check_ratio.
291 : : //! @returns an error code or zero.
292 : : int CheckAddrman() const EXCLUSIVE_LOCKS_REQUIRED(cs);
293 : : };
294 : :
295 : : #endif // BITCOIN_ADDRMAN_IMPL_H
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