LCOV - code coverage report
Current view: top level - src - netaddress.h (source / functions) Hit Total Coverage
Test: fuzz_coverage.info Lines: 56 103 54.4 %
Date: 2023-11-06 23:13:05 Functions: 39 130 30.0 %
Branches: 16 226 7.1 %

           Branch data     Line data    Source code
       1                 :            : // Copyright (c) 2009-2022 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_NETADDRESS_H
       6                 :            : #define BITCOIN_NETADDRESS_H
       7                 :            : 
       8                 :            : #if defined(HAVE_CONFIG_H)
       9                 :            : #include <config/bitcoin-config.h>
      10                 :            : #endif
      11                 :            : 
      12                 :            : #include <compat/compat.h>
      13                 :            : #include <crypto/siphash.h>
      14                 :            : #include <prevector.h>
      15                 :            : #include <random.h>
      16                 :            : #include <serialize.h>
      17                 :            : #include <tinyformat.h>
      18                 :            : #include <util/strencodings.h>
      19                 :            : #include <util/string.h>
      20                 :            : 
      21                 :            : #include <array>
      22                 :            : #include <cstdint>
      23                 :            : #include <ios>
      24                 :            : #include <string>
      25                 :            : #include <vector>
      26                 :            : 
      27                 :            : /**
      28                 :            :  * A network type.
      29                 :            :  * @note An address may belong to more than one network, for example `10.0.0.1`
      30                 :            :  * belongs to both `NET_UNROUTABLE` and `NET_IPV4`.
      31                 :            :  * Keep these sequential starting from 0 and `NET_MAX` as the last entry.
      32                 :            :  * We have loops like `for (int i = 0; i < NET_MAX; ++i)` that expect to iterate
      33                 :            :  * over all enum values and also `GetExtNetwork()` "extends" this enum by
      34                 :            :  * introducing standalone constants starting from `NET_MAX`.
      35                 :            :  */
      36                 :            : enum Network {
      37                 :            :     /// Addresses from these networks are not publicly routable on the global Internet.
      38                 :            :     NET_UNROUTABLE = 0,
      39                 :            : 
      40                 :            :     /// IPv4
      41                 :            :     NET_IPV4,
      42                 :            : 
      43                 :            :     /// IPv6
      44                 :            :     NET_IPV6,
      45                 :            : 
      46                 :            :     /// TOR (v2 or v3)
      47                 :            :     NET_ONION,
      48                 :            : 
      49                 :            :     /// I2P
      50                 :            :     NET_I2P,
      51                 :            : 
      52                 :            :     /// CJDNS
      53                 :            :     NET_CJDNS,
      54                 :            : 
      55                 :            :     /// A set of addresses that represent the hash of a string or FQDN. We use
      56                 :            :     /// them in AddrMan to keep track of which DNS seeds were used.
      57                 :            :     NET_INTERNAL,
      58                 :            : 
      59                 :            :     /// Dummy value to indicate the number of NET_* constants.
      60                 :            :     NET_MAX,
      61                 :            : };
      62                 :            : 
      63                 :            : /// Prefix of an IPv6 address when it contains an embedded IPv4 address.
      64                 :            : /// Used when (un)serializing addresses in ADDRv1 format (pre-BIP155).
      65                 :            : static const std::array<uint8_t, 12> IPV4_IN_IPV6_PREFIX{
      66                 :            :     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF};
      67                 :            : 
      68                 :            : /// Prefix of an IPv6 address when it contains an embedded TORv2 address.
      69                 :            : /// Used when (un)serializing addresses in ADDRv1 format (pre-BIP155).
      70                 :            : /// Such dummy IPv6 addresses are guaranteed to not be publicly routable as they
      71                 :            : /// fall under RFC4193's fc00::/7 subnet allocated to unique-local addresses.
      72                 :            : static const std::array<uint8_t, 6> TORV2_IN_IPV6_PREFIX{
      73                 :            :     0xFD, 0x87, 0xD8, 0x7E, 0xEB, 0x43};
      74                 :            : 
      75                 :            : /// Prefix of an IPv6 address when it contains an embedded "internal" address.
      76                 :            : /// Used when (un)serializing addresses in ADDRv1 format (pre-BIP155).
      77                 :            : /// The prefix comes from 0xFD + SHA256("bitcoin")[0:5].
      78                 :            : /// Such dummy IPv6 addresses are guaranteed to not be publicly routable as they
      79                 :            : /// fall under RFC4193's fc00::/7 subnet allocated to unique-local addresses.
      80                 :            : static const std::array<uint8_t, 6> INTERNAL_IN_IPV6_PREFIX{
      81                 :            :     0xFD, 0x6B, 0x88, 0xC0, 0x87, 0x24 // 0xFD + sha256("bitcoin")[0:5].
      82                 :            : };
      83                 :            : 
      84                 :            : /// Size of IPv4 address (in bytes).
      85                 :            : static constexpr size_t ADDR_IPV4_SIZE = 4;
      86                 :            : 
      87                 :            : /// Size of IPv6 address (in bytes).
      88                 :            : static constexpr size_t ADDR_IPV6_SIZE = 16;
      89                 :            : 
      90                 :            : /// Size of TORv3 address (in bytes). This is the length of just the address
      91                 :            : /// as used in BIP155, without the checksum and the version byte.
      92                 :            : static constexpr size_t ADDR_TORV3_SIZE = 32;
      93                 :            : 
      94                 :            : /// Size of I2P address (in bytes).
      95                 :            : static constexpr size_t ADDR_I2P_SIZE = 32;
      96                 :            : 
      97                 :            : /// Size of CJDNS address (in bytes).
      98                 :            : static constexpr size_t ADDR_CJDNS_SIZE = 16;
      99                 :            : 
     100                 :            : /// Size of "internal" (NET_INTERNAL) address (in bytes).
     101                 :            : static constexpr size_t ADDR_INTERNAL_SIZE = 10;
     102                 :            : 
     103                 :            : /// SAM 3.1 and earlier do not support specifying ports and force the port to 0.
     104                 :            : static constexpr uint16_t I2P_SAM31_PORT{0};
     105                 :            : 
     106                 :            : std::string OnionToString(Span<const uint8_t> addr);
     107                 :            : 
     108                 :            : /**
     109                 :            :  * Network address.
     110                 :            :  */
     111                 :          0 : class CNetAddr
     112                 :            : {
     113                 :            : protected:
     114                 :            :     /**
     115                 :            :      * Raw representation of the network address.
     116                 :            :      * In network byte order (big endian) for IPv4 and IPv6.
     117                 :            :      */
     118                 :            :     prevector<ADDR_IPV6_SIZE, uint8_t> m_addr{ADDR_IPV6_SIZE, 0x0};
     119                 :            : 
     120                 :            :     /**
     121                 :            :      * Network to which this address belongs.
     122                 :            :      */
     123                 :            :     Network m_net{NET_IPV6};
     124                 :            : 
     125                 :            :     /**
     126                 :            :      * Scope id if scoped/link-local IPV6 address.
     127                 :            :      * See https://tools.ietf.org/html/rfc4007
     128                 :            :      */
     129                 :            :     uint32_t m_scope_id{0};
     130                 :            : 
     131                 :            : public:
     132                 :            :     CNetAddr();
     133                 :            :     explicit CNetAddr(const struct in_addr& ipv4Addr);
     134                 :            :     void SetIP(const CNetAddr& ip);
     135                 :            : 
     136                 :            :     /**
     137                 :            :      * Set from a legacy IPv6 address.
     138                 :            :      * Legacy IPv6 address may be a normal IPv6 address, or another address
     139                 :            :      * (e.g. IPv4) disguised as IPv6. This encoding is used in the legacy
     140                 :            :      * `addr` encoding.
     141                 :            :      */
     142                 :            :     void SetLegacyIPv6(Span<const uint8_t> ipv6);
     143                 :            : 
     144                 :            :     bool SetInternal(const std::string& name);
     145                 :            : 
     146                 :            :     /**
     147                 :            :      * Parse a Tor or I2P address and set this object to it.
     148                 :            :      * @param[in] addr Address to parse, for example
     149                 :            :      * pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscryd.onion or
     150                 :            :      * ukeu3k5oycgaauneqgtnvselmt4yemvoilkln7jpvamvfx7dnkdq.b32.i2p.
     151                 :            :      * @returns Whether the operation was successful.
     152                 :            :      * @see CNetAddr::IsTor(), CNetAddr::IsI2P()
     153                 :            :      */
     154                 :            :     bool SetSpecial(const std::string& addr);
     155                 :            : 
     156                 :            :     bool IsBindAny() const; // INADDR_ANY equivalent
     157                 :      12593 :     [[nodiscard]] bool IsIPv4() const { return m_net == NET_IPV4; } // IPv4 mapped address (::FFFF:0:0/96, 0.0.0.0/0)
     158                 :      12523 :     [[nodiscard]] bool IsIPv6() const { return m_net == NET_IPV6; } // IPv6 address (not mapped IPv4, not Tor)
     159                 :            :     bool IsRFC1918() const; // IPv4 private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12)
     160                 :            :     bool IsRFC2544() const; // IPv4 inter-network communications (198.18.0.0/15)
     161                 :            :     bool IsRFC6598() const; // IPv4 ISP-level NAT (100.64.0.0/10)
     162                 :            :     bool IsRFC5737() const; // IPv4 documentation addresses (192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24)
     163                 :            :     bool IsRFC3849() const; // IPv6 documentation address (2001:0DB8::/32)
     164                 :            :     bool IsRFC3927() const; // IPv4 autoconfig (169.254.0.0/16)
     165                 :            :     bool IsRFC3964() const; // IPv6 6to4 tunnelling (2002::/16)
     166                 :            :     bool IsRFC4193() const; // IPv6 unique local (FC00::/7)
     167                 :            :     bool IsRFC4380() const; // IPv6 Teredo tunnelling (2001::/32)
     168                 :            :     bool IsRFC4843() const; // IPv6 ORCHID (deprecated) (2001:10::/28)
     169                 :            :     bool IsRFC7343() const; // IPv6 ORCHIDv2 (2001:20::/28)
     170                 :            :     bool IsRFC4862() const; // IPv6 autoconfig (FE80::/64)
     171                 :            :     bool IsRFC6052() const; // IPv6 well-known prefix for IPv4-embedded address (64:FF9B::/96)
     172                 :            :     bool IsRFC6145() const; // IPv6 IPv4-translated address (::FFFF:0:0:0/96) (actually defined in RFC2765)
     173                 :            :     bool IsHeNet() const;   // IPv6 Hurricane Electric - https://he.net (2001:0470::/36)
     174                 :         12 :     [[nodiscard]] bool IsTor() const { return m_net == NET_ONION; }
     175                 :        156 :     [[nodiscard]] bool IsI2P() const { return m_net == NET_I2P; }
     176                 :       1902 :     [[nodiscard]] bool IsCJDNS() const { return m_net == NET_CJDNS; }
     177                 :          0 :     [[nodiscard]] bool HasCJDNSPrefix() const { return m_addr[0] == 0xfc; }
     178                 :            :     bool IsLocal() const;
     179                 :            :     bool IsRoutable() const;
     180                 :            :     bool IsInternal() const;
     181                 :            :     bool IsValid() const;
     182                 :            : 
     183                 :            :     /**
     184                 :            :      * Whether this object is a privacy network.
     185                 :            :      * TODO: consider adding IsCJDNS() here when more peers adopt CJDNS, see:
     186                 :            :      * https://github.com/bitcoin/bitcoin/pull/27411#issuecomment-1497176155
     187                 :            :      */
     188         [ #  # ]:          0 :     [[nodiscard]] bool IsPrivacyNet() const { return IsTor() || IsI2P(); }
     189                 :            : 
     190                 :            :     /**
     191                 :            :      * Check if the current object can be serialized in pre-ADDRv2/BIP155 format.
     192                 :            :      */
     193                 :            :     bool IsAddrV1Compatible() const;
     194                 :            : 
     195                 :            :     enum Network GetNetwork() const;
     196                 :            :     std::string ToStringAddr() const;
     197                 :            :     bool GetInAddr(struct in_addr* pipv4Addr) const;
     198                 :            :     Network GetNetClass() const;
     199                 :            : 
     200                 :            :     //! For IPv4, mapped IPv4, SIIT translated IPv4, Teredo, 6to4 tunneled addresses, return the relevant IPv4 address as a uint32.
     201                 :            :     uint32_t GetLinkedIPv4() const;
     202                 :            :     //! Whether this address has a linked IPv4 address (see GetLinkedIPv4()).
     203                 :            :     bool HasLinkedIPv4() const;
     204                 :            : 
     205                 :            :     std::vector<unsigned char> GetAddrBytes() const;
     206                 :            :     int GetReachabilityFrom(const CNetAddr& paddrPartner) const;
     207                 :            : 
     208                 :            :     explicit CNetAddr(const struct in6_addr& pipv6Addr, const uint32_t scope = 0);
     209                 :            :     bool GetIn6Addr(struct in6_addr* pipv6Addr) const;
     210                 :            : 
     211                 :            :     friend bool operator==(const CNetAddr& a, const CNetAddr& b);
     212                 :            :     friend bool operator!=(const CNetAddr& a, const CNetAddr& b) { return !(a == b); }
     213                 :            :     friend bool operator<(const CNetAddr& a, const CNetAddr& b);
     214                 :            : 
     215                 :            :     /**
     216                 :            :      * Whether this address should be relayed to other peers even if we can't reach it ourselves.
     217                 :            :      */
     218                 :          0 :     bool IsRelayable() const
     219                 :            :     {
     220 [ #  # ][ #  # ]:          0 :         return IsIPv4() || IsIPv6() || IsTor() || IsI2P() || IsCJDNS();
         [ #  # ][ #  # ]
     221                 :            :     }
     222                 :            : 
     223                 :            :     enum class Encoding {
     224                 :            :         V1,
     225                 :            :         V2, //!< BIP155 encoding
     226                 :            :     };
     227                 :            :     struct SerParams {
     228                 :            :         const Encoding enc;
     229                 :        303 :         SER_PARAMS_OPFUNC
     230                 :            :     };
     231                 :            :     static constexpr SerParams V1{Encoding::V1};
     232                 :            :     static constexpr SerParams V2{Encoding::V2};
     233                 :            : 
     234                 :            :     /**
     235                 :            :      * Serialize to a stream.
     236                 :            :      */
     237                 :            :     template <typename Stream>
     238                 :        578 :     void Serialize(Stream& s) const
     239                 :            :     {
     240 [ +  + ][ +  - ]:        578 :         if (s.GetParams().enc == Encoding::V2) {
         [ #  # ][ #  # ]
     241                 :        290 :             SerializeV2Stream(s);
     242                 :        290 :         } else {
     243                 :        288 :             SerializeV1Stream(s);
     244                 :            :         }
     245                 :        578 :     }
     246                 :            : 
     247                 :            :     /**
     248                 :            :      * Unserialize from a stream.
     249                 :            :      */
     250                 :            :     template <typename Stream>
     251                 :         15 :     void Unserialize(Stream& s)
     252                 :            :     {
     253 [ -  + ][ #  # ]:         15 :         if (s.GetParams().enc == Encoding::V2) {
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     254                 :          0 :             UnserializeV2Stream(s);
     255                 :          0 :         } else {
     256                 :         15 :             UnserializeV1Stream(s);
     257                 :            :         }
     258                 :         15 :     }
     259                 :            : 
     260                 :            :     friend class CSubNet;
     261                 :            : 
     262                 :            : private:
     263                 :            :     /**
     264                 :            :      * Parse a Tor address and set this object to it.
     265                 :            :      * @param[in] addr Address to parse, must be a valid C string, for example
     266                 :            :      * pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscryd.onion.
     267                 :            :      * @returns Whether the operation was successful.
     268                 :            :      * @see CNetAddr::IsTor()
     269                 :            :      */
     270                 :            :     bool SetTor(const std::string& addr);
     271                 :            : 
     272                 :            :     /**
     273                 :            :      * Parse an I2P address and set this object to it.
     274                 :            :      * @param[in] addr Address to parse, must be a valid C string, for example
     275                 :            :      * ukeu3k5oycgaauneqgtnvselmt4yemvoilkln7jpvamvfx7dnkdq.b32.i2p.
     276                 :            :      * @returns Whether the operation was successful.
     277                 :            :      * @see CNetAddr::IsI2P()
     278                 :            :      */
     279                 :            :     bool SetI2P(const std::string& addr);
     280                 :            : 
     281                 :            :     /**
     282                 :            :      * BIP155 network ids recognized by this software.
     283                 :            :      */
     284                 :            :     enum BIP155Network : uint8_t {
     285                 :            :         IPV4 = 1,
     286                 :            :         IPV6 = 2,
     287                 :            :         TORV2 = 3,
     288                 :            :         TORV3 = 4,
     289                 :            :         I2P = 5,
     290                 :            :         CJDNS = 6,
     291                 :            :     };
     292                 :            : 
     293                 :            :     /**
     294                 :            :      * Size of CNetAddr when serialized as ADDRv1 (pre-BIP155) (in bytes).
     295                 :            :      */
     296                 :            :     static constexpr size_t V1_SERIALIZATION_SIZE = ADDR_IPV6_SIZE;
     297                 :            : 
     298                 :            :     /**
     299                 :            :      * Maximum size of an address as defined in BIP155 (in bytes).
     300                 :            :      * This is only the size of the address, not the entire CNetAddr object
     301                 :            :      * when serialized.
     302                 :            :      */
     303                 :            :     static constexpr size_t MAX_ADDRV2_SIZE = 512;
     304                 :            : 
     305                 :            :     /**
     306                 :            :      * Get the BIP155 network id of this address.
     307                 :            :      * Must not be called for IsInternal() objects.
     308                 :            :      * @returns BIP155 network id, except TORV2 which is no longer supported.
     309                 :            :      */
     310                 :            :     BIP155Network GetBIP155Network() const;
     311                 :            : 
     312                 :            :     /**
     313                 :            :      * Set `m_net` from the provided BIP155 network id and size after validation.
     314                 :            :      * @retval true the network was recognized, is valid and `m_net` was set
     315                 :            :      * @retval false not recognised (from future?) and should be silently ignored
     316                 :            :      * @throws std::ios_base::failure if the network is one of the BIP155 founding
     317                 :            :      * networks (id 1..6) with wrong address size.
     318                 :            :      */
     319                 :            :     bool SetNetFromBIP155Network(uint8_t possible_bip155_net, size_t address_size);
     320                 :            : 
     321                 :            :     /**
     322                 :            :      * Serialize in pre-ADDRv2/BIP155 format to an array.
     323                 :            :      */
     324                 :        295 :     void SerializeV1Array(uint8_t (&arr)[V1_SERIALIZATION_SIZE]) const
     325                 :            :     {
     326                 :            :         size_t prefix_size;
     327                 :            : 
     328   [ -  -  +  +  :        295 :         switch (m_net) {
                   -  - ]
     329                 :            :         case NET_IPV6:
     330         [ -  + ]:        144 :             assert(m_addr.size() == sizeof(arr));
     331                 :        144 :             memcpy(arr, m_addr.data(), m_addr.size());
     332                 :        144 :             return;
     333                 :            :         case NET_IPV4:
     334                 :        151 :             prefix_size = sizeof(IPV4_IN_IPV6_PREFIX);
     335         [ +  - ]:        151 :             assert(prefix_size + m_addr.size() == sizeof(arr));
     336                 :        151 :             memcpy(arr, IPV4_IN_IPV6_PREFIX.data(), prefix_size);
     337                 :        151 :             memcpy(arr + prefix_size, m_addr.data(), m_addr.size());
     338                 :        151 :             return;
     339                 :            :         case NET_INTERNAL:
     340                 :          0 :             prefix_size = sizeof(INTERNAL_IN_IPV6_PREFIX);
     341         [ #  # ]:          0 :             assert(prefix_size + m_addr.size() == sizeof(arr));
     342                 :          0 :             memcpy(arr, INTERNAL_IN_IPV6_PREFIX.data(), prefix_size);
     343                 :          0 :             memcpy(arr + prefix_size, m_addr.data(), m_addr.size());
     344                 :          0 :             return;
     345                 :            :         case NET_ONION:
     346                 :            :         case NET_I2P:
     347                 :            :         case NET_CJDNS:
     348                 :          0 :             break;
     349                 :            :         case NET_UNROUTABLE:
     350                 :            :         case NET_MAX:
     351                 :          0 :             assert(false);
     352                 :            :         } // no default case, so the compiler can warn about missing cases
     353                 :            : 
     354                 :            :         // Serialize ONION, I2P and CJDNS as all-zeros.
     355                 :          0 :         memset(arr, 0x0, V1_SERIALIZATION_SIZE);
     356                 :        295 :     }
     357                 :            : 
     358                 :            :     /**
     359                 :            :      * Serialize in pre-ADDRv2/BIP155 format to a stream.
     360                 :            :      */
     361                 :            :     template <typename Stream>
     362                 :        288 :     void SerializeV1Stream(Stream& s) const
     363                 :            :     {
     364                 :            :         uint8_t serialized[V1_SERIALIZATION_SIZE];
     365                 :            : 
     366                 :        288 :         SerializeV1Array(serialized);
     367                 :            : 
     368                 :        288 :         s << serialized;
     369                 :        288 :     }
     370                 :            : 
     371                 :            :     /**
     372                 :            :      * Serialize as ADDRv2 / BIP155.
     373                 :            :      */
     374                 :            :     template <typename Stream>
     375                 :        290 :     void SerializeV2Stream(Stream& s) const
     376                 :            :     {
     377 [ -  + ][ -  + ]:        290 :         if (IsInternal()) {
         [ #  # ][ #  # ]
     378                 :            :             // Serialize NET_INTERNAL as embedded in IPv6. We need to
     379                 :            :             // serialize such addresses from addrman.
     380                 :          0 :             s << static_cast<uint8_t>(BIP155Network::IPV6);
     381                 :          0 :             s << COMPACTSIZE(ADDR_IPV6_SIZE);
     382                 :          0 :             SerializeV1Stream(s);
     383                 :          0 :             return;
     384                 :            :         }
     385                 :            : 
     386                 :        290 :         s << static_cast<uint8_t>(GetBIP155Network());
     387                 :        290 :         s << m_addr;
     388                 :        290 :     }
     389                 :            : 
     390                 :            :     /**
     391                 :            :      * Unserialize from a pre-ADDRv2/BIP155 format from an array.
     392                 :            :      *
     393                 :            :      * This function is only called from UnserializeV1Stream() and is a wrapper
     394                 :            :      * for SetLegacyIPv6(); however, we keep it for symmetry with
     395                 :            :      * SerializeV1Array() to have pairs of ser/unser functions and to make clear
     396                 :            :      * that if one is altered, a corresponding reverse modification should be
     397                 :            :      * applied to the other.
     398                 :            :      */
     399                 :         15 :     void UnserializeV1Array(uint8_t (&arr)[V1_SERIALIZATION_SIZE])
     400                 :            :     {
     401                 :            :         // Use SetLegacyIPv6() so that m_net is set correctly. For example
     402                 :            :         // ::FFFF:0102:0304 should be set as m_net=NET_IPV4 (1.2.3.4).
     403                 :         15 :         SetLegacyIPv6(arr);
     404                 :         15 :     }
     405                 :            : 
     406                 :            :     /**
     407                 :            :      * Unserialize from a pre-ADDRv2/BIP155 format from a stream.
     408                 :            :      */
     409                 :            :     template <typename Stream>
     410                 :         15 :     void UnserializeV1Stream(Stream& s)
     411                 :            :     {
     412                 :            :         uint8_t serialized[V1_SERIALIZATION_SIZE];
     413                 :            : 
     414                 :         15 :         s >> serialized;
     415                 :            : 
     416                 :         15 :         UnserializeV1Array(serialized);
     417                 :         15 :     }
     418                 :            : 
     419                 :            :     /**
     420                 :            :      * Unserialize from a ADDRv2 / BIP155 format.
     421                 :            :      */
     422                 :            :     template <typename Stream>
     423                 :          0 :     void UnserializeV2Stream(Stream& s)
     424                 :            :     {
     425                 :            :         uint8_t bip155_net;
     426                 :          0 :         s >> bip155_net;
     427                 :            : 
     428                 :            :         size_t address_size;
     429                 :          0 :         s >> COMPACTSIZE(address_size);
     430                 :            : 
     431 [ #  # ][ #  # ]:          0 :         if (address_size > MAX_ADDRV2_SIZE) {
         [ #  # ][ #  # ]
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     432 [ #  # ][ #  # ]:          0 :             throw std::ios_base::failure(strprintf(
         [ #  # ][ #  # ]
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     433                 :            :                 "Address too long: %u > %u", address_size, MAX_ADDRV2_SIZE));
     434                 :            :         }
     435                 :            : 
     436                 :          0 :         m_scope_id = 0;
     437                 :            : 
     438 [ #  # ][ #  # ]:          0 :         if (SetNetFromBIP155Network(bip155_net, address_size)) {
         [ #  # ][ #  # ]
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     439                 :          0 :             m_addr.resize(address_size);
     440                 :          0 :             s >> Span{m_addr};
     441                 :            : 
     442 [ #  # ][ #  # ]:          0 :             if (m_net != NET_IPV6) {
         [ #  # ][ #  # ]
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     443                 :          0 :                 return;
     444                 :            :             }
     445                 :            : 
     446                 :            :             // Do some special checks on IPv6 addresses.
     447                 :            : 
     448                 :            :             // Recognize NET_INTERNAL embedded in IPv6, such addresses are not
     449                 :            :             // gossiped but could be coming from addrman, when unserializing from
     450                 :            :             // disk.
     451 [ #  # ][ #  # ]:          0 :             if (HasPrefix(m_addr, INTERNAL_IN_IPV6_PREFIX)) {
         [ #  # ][ #  # ]
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     452                 :          0 :                 m_net = NET_INTERNAL;
     453                 :          0 :                 memmove(m_addr.data(), m_addr.data() + INTERNAL_IN_IPV6_PREFIX.size(),
     454                 :            :                         ADDR_INTERNAL_SIZE);
     455                 :          0 :                 m_addr.resize(ADDR_INTERNAL_SIZE);
     456                 :          0 :                 return;
     457                 :            :             }
     458                 :            : 
     459 [ #  # ][ #  # ]:          0 :             if (!HasPrefix(m_addr, IPV4_IN_IPV6_PREFIX) &&
         [ #  # ][ #  # ]
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     460                 :          0 :                 !HasPrefix(m_addr, TORV2_IN_IPV6_PREFIX)) {
     461                 :          0 :                 return;
     462                 :            :             }
     463                 :            : 
     464                 :            :             // IPv4 and TORv2 are not supposed to be embedded in IPv6 (like in V1
     465                 :            :             // encoding). Unserialize as !IsValid(), thus ignoring them.
     466                 :          0 :         } else {
     467                 :            :             // If we receive an unknown BIP155 network id (from the future?) then
     468                 :            :             // ignore the address - unserialize as !IsValid().
     469                 :          0 :             s.ignore(address_size);
     470                 :            :         }
     471                 :            : 
     472                 :            :         // Mimic a default-constructed CNetAddr object which is !IsValid() and thus
     473                 :            :         // will not be gossiped, but continue reading next addresses from the stream.
     474                 :          0 :         m_net = NET_IPV6;
     475                 :          0 :         m_addr.assign(ADDR_IPV6_SIZE, 0x0);
     476                 :          0 :     }
     477                 :            : };
     478                 :            : 
     479                 :          0 : class CSubNet
     480                 :            : {
     481                 :            : protected:
     482                 :            :     /// Network (base) address
     483                 :            :     CNetAddr network;
     484                 :            :     /// Netmask, in network byte order
     485                 :            :     uint8_t netmask[16];
     486                 :            :     /// Is this value valid? (only used to signal parse errors)
     487                 :            :     bool valid;
     488                 :            : 
     489                 :            : public:
     490                 :            :     /**
     491                 :            :      * Construct an invalid subnet (empty, `Match()` always returns false).
     492                 :            :      */
     493                 :            :     CSubNet();
     494                 :            : 
     495                 :            :     /**
     496                 :            :      * Construct from a given network start and number of bits (CIDR mask).
     497                 :            :      * @param[in] addr Network start. Must be IPv4 or IPv6, otherwise an invalid subnet is
     498                 :            :      * created.
     499                 :            :      * @param[in] mask CIDR mask, must be in [0, 32] for IPv4 addresses and in [0, 128] for
     500                 :            :      * IPv6 addresses. Otherwise an invalid subnet is created.
     501                 :            :      */
     502                 :            :     CSubNet(const CNetAddr& addr, uint8_t mask);
     503                 :            : 
     504                 :            :     /**
     505                 :            :      * Construct from a given network start and mask.
     506                 :            :      * @param[in] addr Network start. Must be IPv4 or IPv6, otherwise an invalid subnet is
     507                 :            :      * created.
     508                 :            :      * @param[in] mask Network mask, must be of the same type as `addr` and not contain 0-bits
     509                 :            :      * followed by 1-bits. Otherwise an invalid subnet is created.
     510                 :            :      */
     511                 :            :     CSubNet(const CNetAddr& addr, const CNetAddr& mask);
     512                 :            : 
     513                 :            :     /**
     514                 :            :      * Construct a single-host subnet.
     515                 :            :      * @param[in] addr The sole address to be contained in the subnet, can also be non-IPv[46].
     516                 :            :      */
     517                 :            :     explicit CSubNet(const CNetAddr& addr);
     518                 :            : 
     519                 :            :     bool Match(const CNetAddr& addr) const;
     520                 :            : 
     521                 :            :     std::string ToString() const;
     522                 :            :     bool IsValid() const;
     523                 :            : 
     524                 :            :     friend bool operator==(const CSubNet& a, const CSubNet& b);
     525                 :            :     friend bool operator!=(const CSubNet& a, const CSubNet& b) { return !(a == b); }
     526                 :            :     friend bool operator<(const CSubNet& a, const CSubNet& b);
     527                 :            : };
     528                 :            : 
     529                 :            : /** A combination of a network address (CNetAddr) and a (TCP) port */
     530                 :          0 : class CService : public CNetAddr
     531                 :            : {
     532                 :            : protected:
     533                 :            :     uint16_t port; // host order
     534                 :            : 
     535                 :            : public:
     536                 :            :     CService();
     537                 :            :     CService(const CNetAddr& ip, uint16_t port);
     538                 :            :     CService(const struct in_addr& ipv4Addr, uint16_t port);
     539                 :            :     explicit CService(const struct sockaddr_in& addr);
     540                 :            :     uint16_t GetPort() const;
     541                 :            :     bool GetSockAddr(struct sockaddr* paddr, socklen_t* addrlen) const;
     542                 :            :     bool SetSockAddr(const struct sockaddr* paddr);
     543                 :            :     friend bool operator==(const CService& a, const CService& b);
     544                 :          0 :     friend bool operator!=(const CService& a, const CService& b) { return !(a == b); }
     545                 :            :     friend bool operator<(const CService& a, const CService& b);
     546                 :            :     std::vector<unsigned char> GetKey() const;
     547                 :            :     std::string ToStringAddrPort() const;
     548                 :            : 
     549                 :            :     CService(const struct in6_addr& ipv6Addr, uint16_t port);
     550                 :            :     explicit CService(const struct sockaddr_in6& addr);
     551                 :            : 
     552                 :       1776 :     SERIALIZE_METHODS(CService, obj)
     553                 :            :     {
     554                 :        592 :         READWRITE(AsBase<CNetAddr>(obj), Using<BigEndianFormatter<2>>(obj.port));
     555                 :        592 :     }
     556                 :            : 
     557                 :            :     friend class CServiceHash;
     558                 :            :     friend CService MaybeFlipIPv6toCJDNS(const CService& service);
     559                 :            : };
     560                 :            : 
     561                 :            : class CServiceHash
     562                 :            : {
     563                 :            : public:
     564                 :          1 :     CServiceHash()
     565                 :          1 :         : m_salt_k0{GetRand<uint64_t>()},
     566                 :          1 :           m_salt_k1{GetRand<uint64_t>()}
     567                 :            :     {
     568                 :          1 :     }
     569                 :            : 
     570                 :          0 :     CServiceHash(uint64_t salt_k0, uint64_t salt_k1) : m_salt_k0{salt_k0}, m_salt_k1{salt_k1} {}
     571                 :            : 
     572                 :        181 :     size_t operator()(const CService& a) const noexcept
     573                 :            :     {
     574         [ +  - ]:        181 :         CSipHasher hasher(m_salt_k0, m_salt_k1);
     575         [ +  - ]:        181 :         hasher.Write(a.m_net);
     576         [ +  - ]:        181 :         hasher.Write(a.port);
     577 [ +  - ][ +  - ]:        181 :         hasher.Write(a.m_addr);
     578         [ +  - ]:        181 :         return static_cast<size_t>(hasher.Finalize());
     579                 :            :     }
     580                 :            : 
     581                 :            : private:
     582                 :            :     const uint64_t m_salt_k0;
     583                 :            :     const uint64_t m_salt_k1;
     584                 :            : };
     585                 :            : 
     586                 :            : #endif // BITCOIN_NETADDRESS_H

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