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 <logging.h>
       9                 :            : #include <util/asmap.h>
      10                 :            : 
      11                 :          0 : uint256 NetGroupManager::GetAsmapChecksum() const
      12                 :            : {
      13         [ #  # ]:          0 :     if (!m_asmap.size()) return {};
      14                 :            : 
      15                 :          0 :     return (HashWriter{} << m_asmap).GetHash();
      16                 :          0 : }
      17                 :            : 
      18                 :          0 : std::vector<unsigned char> NetGroupManager::GetGroup(const CNetAddr& address) const
      19                 :            : {
      20                 :          0 :     std::vector<unsigned char> vchRet;
      21                 :            :     // If non-empty asmap is supplied and the address is IPv4/IPv6,
      22                 :            :     // return ASN to be used for bucketing.
      23         [ #  # ]:          0 :     uint32_t asn = GetMappedAS(address);
      24         [ #  # ]:          0 :     if (asn != 0) { // Either asmap was empty, or address has non-asmappable net class (e.g. TOR).
      25         [ #  # ]:          0 :         vchRet.push_back(NET_IPV6); // IPv4 and IPv6 with same ASN should be in the same bucket
      26         [ #  # ]:          0 :         for (int i = 0; i < 4; i++) {
      27         [ #  # ]:          0 :             vchRet.push_back((asn >> (8 * i)) & 0xFF);
      28                 :          0 :         }
      29                 :          0 :         return vchRet;
      30                 :            :     }
      31                 :            : 
      32 [ #  # ][ #  # ]:          0 :     vchRet.push_back(address.GetNetClass());
      33                 :          0 :     int nStartByte{0};
      34                 :          0 :     int nBits{0};
      35                 :            : 
      36 [ #  # ][ #  # ]:          0 :     if (address.IsLocal()) {
      37                 :            :         // all local addresses belong to the same group
      38 [ #  # ][ #  # ]:          0 :     } else if (address.IsInternal()) {
      39                 :            :         // All internal-usage addresses get their own group.
      40                 :            :         // Skip over the INTERNAL_IN_IPV6_PREFIX returned by CAddress::GetAddrBytes().
      41                 :          0 :         nStartByte = INTERNAL_IN_IPV6_PREFIX.size();
      42                 :          0 :         nBits = ADDR_INTERNAL_SIZE * 8;
      43 [ #  # ][ #  # ]:          0 :     } else if (!address.IsRoutable()) {
      44                 :            :         // all other unroutable addresses belong to the same group
      45 [ #  # ][ #  # ]:          0 :     } else if (address.HasLinkedIPv4()) {
      46                 :            :         // IPv4 addresses (and mapped IPv4 addresses) use /16 groups
      47         [ #  # ]:          0 :         uint32_t ipv4 = address.GetLinkedIPv4();
      48         [ #  # ]:          0 :         vchRet.push_back((ipv4 >> 24) & 0xFF);
      49         [ #  # ]:          0 :         vchRet.push_back((ipv4 >> 16) & 0xFF);
      50                 :          0 :         return vchRet;
      51 [ #  # ][ #  # ]:          0 :     } else if (address.IsTor() || address.IsI2P()) {
         [ #  # ][ #  # ]
      52                 :          0 :         nBits = 4;
      53 [ #  # ][ #  # ]:          0 :     } else if (address.IsCJDNS()) {
      54                 :            :         // Treat in the same way as Tor and I2P because the address in all of
      55                 :            :         // them is "random" bytes (derived from a public key). However in CJDNS
      56                 :            :         // the first byte is a constant (see CJDNS_PREFIX), so the random bytes
      57                 :            :         // come after it. Thus skip the constant 8 bits at the start.
      58                 :          0 :         nBits = 12;
      59 [ #  # ][ #  # ]:          0 :     } else if (address.IsHeNet()) {
      60                 :            :         // for he.net, use /36 groups
      61                 :          0 :         nBits = 36;
      62                 :          0 :     } else {
      63                 :            :         // for the rest of the IPv6 network, use /32 groups
      64                 :          0 :         nBits = 32;
      65                 :            :     }
      66                 :            : 
      67                 :            :     // Push our address onto vchRet.
      68         [ #  # ]:          0 :     auto addr_bytes = address.GetAddrBytes();
      69                 :          0 :     const size_t num_bytes = nBits / 8;
      70         [ #  # ]:          0 :     vchRet.insert(vchRet.end(), addr_bytes.begin() + nStartByte, addr_bytes.begin() + nStartByte + num_bytes);
      71                 :          0 :     nBits %= 8;
      72                 :            :     // ...for the last byte, push nBits and for the rest of the byte push 1's
      73         [ #  # ]:          0 :     if (nBits > 0) {
      74         [ #  # ]:          0 :         assert(num_bytes < addr_bytes.size());
      75         [ #  # ]:          0 :         vchRet.push_back(addr_bytes[num_bytes + nStartByte] | ((1 << (8 - nBits)) - 1));
      76                 :          0 :     }
      77                 :            : 
      78                 :          0 :     return vchRet;
      79         [ #  # ]:          0 : }
      80                 :            : 
      81                 :          0 : uint32_t NetGroupManager::GetMappedAS(const CNetAddr& address) const
      82                 :            : {
      83                 :          0 :     uint32_t net_class = address.GetNetClass();
      84 [ #  # ][ #  # ]:          0 :     if (m_asmap.size() == 0 || (net_class != NET_IPV4 && net_class != NET_IPV6)) {
                 [ #  # ]
      85                 :          0 :         return 0; // Indicates not found, safe because AS0 is reserved per RFC7607.
      86                 :            :     }
      87         [ #  # ]:          0 :     std::vector<bool> ip_bits(128);
      88 [ #  # ][ #  # ]:          0 :     if (address.HasLinkedIPv4()) {
      89                 :            :         // For lookup, treat as if it was just an IPv4 address (IPV4_IN_IPV6_PREFIX + IPv4 bits)
      90         [ #  # ]:          0 :         for (int8_t byte_i = 0; byte_i < 12; ++byte_i) {
      91         [ #  # ]:          0 :             for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) {
      92         [ #  # ]:          0 :                 ip_bits[byte_i * 8 + bit_i] = (IPV4_IN_IPV6_PREFIX[byte_i] >> (7 - bit_i)) & 1;
      93                 :          0 :             }
      94                 :          0 :         }
      95         [ #  # ]:          0 :         uint32_t ipv4 = address.GetLinkedIPv4();
      96         [ #  # ]:          0 :         for (int i = 0; i < 32; ++i) {
      97         [ #  # ]:          0 :             ip_bits[96 + i] = (ipv4 >> (31 - i)) & 1;
      98                 :          0 :         }
      99                 :          0 :     } else {
     100                 :            :         // Use all 128 bits of the IPv6 address otherwise
     101 [ #  # ][ #  # ]:          0 :         assert(address.IsIPv6());
     102         [ #  # ]:          0 :         auto addr_bytes = address.GetAddrBytes();
     103         [ #  # ]:          0 :         for (int8_t byte_i = 0; byte_i < 16; ++byte_i) {
     104                 :          0 :             uint8_t cur_byte = addr_bytes[byte_i];
     105         [ #  # ]:          0 :             for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) {
     106         [ #  # ]:          0 :                 ip_bits[byte_i * 8 + bit_i] = (cur_byte >> (7 - bit_i)) & 1;
     107                 :          0 :             }
     108                 :          0 :         }
     109                 :          0 :     }
     110         [ #  # ]:          0 :     uint32_t mapped_as = Interpret(m_asmap, ip_bits);
     111                 :          0 :     return mapped_as;
     112                 :          0 : }
     113                 :            : 
     114                 :          0 : void NetGroupManager::ASMapHealthCheck(const std::vector<CNetAddr>& clearnet_addrs) const {
     115                 :          0 :     std::set<uint32_t> clearnet_asns{};
     116                 :          0 :     int unmapped_count{0};
     117                 :            : 
     118         [ #  # ]:          0 :     for (const auto& addr : clearnet_addrs) {
     119         [ #  # ]:          0 :         uint32_t asn = GetMappedAS(addr);
     120         [ #  # ]:          0 :         if (asn == 0) {
     121                 :          0 :             ++unmapped_count;
     122                 :          0 :             continue;
     123                 :            :         }
     124         [ #  # ]:          0 :         clearnet_asns.insert(asn);
     125                 :            :     }
     126                 :            : 
     127 [ #  # ][ #  # ]:          0 :     LogPrintf("ASMap Health Check: %i clearnet peers are mapped to %i ASNs with %i peers being unmapped\n", clearnet_addrs.size(), clearnet_asns.size(), unmapped_count);
                 [ #  # ]
     128                 :          0 : }
     129                 :            : 
     130                 :          0 : bool NetGroupManager::UsingASMap() const {
     131                 :          0 :     return m_asmap.size() > 0;
     132                 :            : }