Branch data     Line data    Source code

       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                 :            : #include <netgroup.h>
       6                 :            : 
       7                 :            : #include <hash.h>
       8                 :            : #include <util/asmap.h>
       9                 :            : 
      10                 :          1 : uint256 NetGroupManager::GetAsmapChecksum() const
      11                 :            : {
      12         [ +  - ]:          1 :     if (!m_asmap.size()) return {};
      13                 :            : 
      14                 :          0 :     return (HashWriter{} << m_asmap).GetHash();
      15                 :          1 : }
      16                 :            : 
      17                 :        162 : std::vector<unsigned char> NetGroupManager::GetGroup(const CNetAddr& address) const
      18                 :            : {
      19                 :        162 :     std::vector<unsigned char> vchRet;
      20                 :            :     // If non-empty asmap is supplied and the address is IPv4/IPv6,
      21                 :            :     // return ASN to be used for bucketing.
      22         [ +  - ]:        162 :     uint32_t asn = GetMappedAS(address);
      23         [ -  + ]:        162 :     if (asn != 0) { // Either asmap was empty, or address has non-asmappable net class (e.g. TOR).
      24         [ #  # ]:          0 :         vchRet.push_back(NET_IPV6); // IPv4 and IPv6 with same ASN should be in the same bucket
      25         [ #  # ]:          0 :         for (int i = 0; i < 4; i++) {
      26         [ #  # ]:          0 :             vchRet.push_back((asn >> (8 * i)) & 0xFF);
      27                 :          0 :         }
      28                 :          0 :         return vchRet;
      29                 :            :     }
      30                 :            : 
      31 [ +  - ][ +  - ]:        162 :     vchRet.push_back(address.GetNetClass());
      32                 :        162 :     int nStartByte{0};
      33                 :        162 :     int nBits{0};
      34                 :            : 
      35 [ +  - ][ +  - ]:        162 :     if (address.IsLocal()) {
      36                 :            :         // all local addresses belong to the same group
      37 [ +  - ][ +  - ]:        162 :     } else if (address.IsInternal()) {
      38                 :            :         // All internal-usage addresses get their own group.
      39                 :            :         // Skip over the INTERNAL_IN_IPV6_PREFIX returned by CAddress::GetAddrBytes().
      40                 :          0 :         nStartByte = INTERNAL_IN_IPV6_PREFIX.size();
      41                 :          0 :         nBits = ADDR_INTERNAL_SIZE * 8;
      42 [ +  - ][ +  - ]:        162 :     } else if (!address.IsRoutable()) {
      43                 :            :         // all other unroutable addresses belong to the same group
      44 [ +  - ][ +  - ]:        162 :     } else if (address.HasLinkedIPv4()) {
      45                 :            :         // IPv4 addresses (and mapped IPv4 addresses) use /16 groups
      46         [ +  - ]:        162 :         uint32_t ipv4 = address.GetLinkedIPv4();
      47         [ +  - ]:        162 :         vchRet.push_back((ipv4 >> 24) & 0xFF);
      48         [ +  - ]:        162 :         vchRet.push_back((ipv4 >> 16) & 0xFF);
      49                 :        162 :         return vchRet;
      50 [ #  # ][ #  # ]:          0 :     } else if (address.IsTor() || address.IsI2P()) {
         [ #  # ][ #  # ]
      51                 :          0 :         nBits = 4;
      52 [ #  # ][ #  # ]:          0 :     } else if (address.IsCJDNS()) {
      53                 :            :         // Treat in the same way as Tor and I2P because the address in all of
      54                 :            :         // them is "random" bytes (derived from a public key). However in CJDNS
      55                 :            :         // the first byte is a constant 0xfc, so the random bytes come after it.
      56                 :            :         // Thus skip the constant 8 bits at the start.
      57                 :          0 :         nBits = 12;
      58 [ #  # ][ #  # ]:          0 :     } else if (address.IsHeNet()) {
      59                 :            :         // for he.net, use /36 groups
      60                 :          0 :         nBits = 36;
      61                 :          0 :     } else {
      62                 :            :         // for the rest of the IPv6 network, use /32 groups
      63                 :          0 :         nBits = 32;
      64                 :            :     }
      65                 :            : 
      66                 :            :     // Push our address onto vchRet.
      67         [ #  # ]:          0 :     auto addr_bytes = address.GetAddrBytes();
      68                 :          0 :     const size_t num_bytes = nBits / 8;
      69         [ #  # ]:          0 :     vchRet.insert(vchRet.end(), addr_bytes.begin() + nStartByte, addr_bytes.begin() + nStartByte + num_bytes);
      70                 :          0 :     nBits %= 8;
      71                 :            :     // ...for the last byte, push nBits and for the rest of the byte push 1's
      72         [ #  # ]:          0 :     if (nBits > 0) {
      73         [ #  # ]:          0 :         assert(num_bytes < addr_bytes.size());
      74         [ #  # ]:          0 :         vchRet.push_back(addr_bytes[num_bytes + nStartByte] | ((1 << (8 - nBits)) - 1));
      75                 :          0 :     }
      76                 :            : 
      77                 :          0 :     return vchRet;
      78         [ +  - ]:        162 : }
      79                 :            : 
      80                 :        184 : uint32_t NetGroupManager::GetMappedAS(const CNetAddr& address) const
      81                 :            : {
      82                 :        184 :     uint32_t net_class = address.GetNetClass();
      83 [ -  + ][ #  # ]:        184 :     if (m_asmap.size() == 0 || (net_class != NET_IPV4 && net_class != NET_IPV6)) {
                 [ #  # ]
      84                 :        184 :         return 0; // Indicates not found, safe because AS0 is reserved per RFC7607.
      85                 :            :     }
      86         [ #  # ]:          0 :     std::vector<bool> ip_bits(128);
      87 [ #  # ][ #  # ]:          0 :     if (address.HasLinkedIPv4()) {
      88                 :            :         // For lookup, treat as if it was just an IPv4 address (IPV4_IN_IPV6_PREFIX + IPv4 bits)
      89         [ #  # ]:          0 :         for (int8_t byte_i = 0; byte_i < 12; ++byte_i) {
      90         [ #  # ]:          0 :             for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) {
      91         [ #  # ]:          0 :                 ip_bits[byte_i * 8 + bit_i] = (IPV4_IN_IPV6_PREFIX[byte_i] >> (7 - bit_i)) & 1;
      92                 :          0 :             }
      93                 :          0 :         }
      94         [ #  # ]:          0 :         uint32_t ipv4 = address.GetLinkedIPv4();
      95         [ #  # ]:          0 :         for (int i = 0; i < 32; ++i) {
      96         [ #  # ]:          0 :             ip_bits[96 + i] = (ipv4 >> (31 - i)) & 1;
      97                 :          0 :         }
      98                 :          0 :     } else {
      99                 :            :         // Use all 128 bits of the IPv6 address otherwise
     100 [ #  # ][ #  # ]:          0 :         assert(address.IsIPv6());
     101         [ #  # ]:          0 :         auto addr_bytes = address.GetAddrBytes();
     102         [ #  # ]:          0 :         for (int8_t byte_i = 0; byte_i < 16; ++byte_i) {
     103                 :          0 :             uint8_t cur_byte = addr_bytes[byte_i];
     104         [ #  # ]:          0 :             for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) {
     105         [ #  # ]:          0 :                 ip_bits[byte_i * 8 + bit_i] = (cur_byte >> (7 - bit_i)) & 1;
     106                 :          0 :             }
     107                 :          0 :         }
     108                 :          0 :     }
     109         [ #  # ]:          0 :     uint32_t mapped_as = Interpret(m_asmap, ip_bits);
     110                 :          0 :     return mapped_as;
     111                 :        184 : }