LCOV - code coverage report
Current view: top level - src - netaddress.cpp (source / functions) Hit Total Coverage
Test: total_coverage.info Lines: 460 543 84.7 %
Date: 2025-02-23 09:33:43 Functions: 79 81 97.5 %

          Line data    Source code
       1             : // Copyright (c) 2009-2010 Satoshi Nakamoto
       2             : // Copyright (c) 2009-2021 The Bitcoin Core developers
       3             : // Copyright (c) 2017-2021 The PIVX Core developers
       4             : // Distributed under the MIT software license, see the accompanying
       5             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       6             : 
       7             : #include "crypto/common.h"
       8             : #include "crypto/sha3.h"
       9             : #include "netaddress.h"
      10             : #include "hash.h"
      11             : #include "prevector.h"
      12             : #include "tinyformat.h"
      13             : #include "util/asmap.h"
      14             : #include "util/string.h"
      15             : #include "utilstrencodings.h"
      16             : 
      17             : #include <algorithm>
      18             : #include <array>
      19             : #include <cstdint>
      20             : #include <ios>
      21             : #include <iterator>
      22             : #include <tuple>
      23             : 
      24             : constexpr size_t CNetAddr::V1_SERIALIZATION_SIZE;
      25             : constexpr size_t CNetAddr::MAX_ADDRV2_SIZE;
      26             : 
      27       85319 : CNetAddr::BIP155Network CNetAddr::GetBIP155Network() const
      28             : {
      29       85319 :     switch (m_net) {
      30             :     case NET_IPV4:
      31             :         return BIP155Network::IPV4;
      32         176 :     case NET_IPV6:
      33         176 :         return BIP155Network::IPV6;
      34           2 :     case NET_ONION:
      35           3 :         switch (m_addr.size()) {
      36             :         case ADDR_TORV2_SIZE:
      37             :             return BIP155Network::TORV2;
      38           1 :         case ADDR_TORV3_SIZE:
      39           1 :             return BIP155Network::TORV3;
      40           0 :         default:
      41           0 :             assert(false);
      42             :         }
      43           0 :     case NET_I2P:
      44           0 :         return BIP155Network::I2P;
      45           0 :     case NET_CJDNS:
      46           0 :         return BIP155Network::CJDNS;
      47           0 :     case NET_INTERNAL:   // should have been handled before calling this function
      48           0 :     case NET_UNROUTABLE: // m_net is never and should not be set to NET_UNROUTABLE
      49           0 :     case NET_MAX:        // m_net is never and should not be set to NET_MAX
      50           0 :         assert(false);
      51             :     } // no default case, so the compiler can warn about missing cases
      52             : 
      53           0 :     assert(false);
      54             : }
      55             : 
      56        5496 : bool CNetAddr::SetNetFromBIP155Network(uint8_t possible_bip155_net, size_t address_size)
      57             : {
      58        5496 :     switch (possible_bip155_net) {
      59        5471 :     case BIP155Network::IPV4:
      60        5471 :         if (address_size == ADDR_IPV4_SIZE) {
      61        5469 :             m_net = NET_IPV4;
      62        5469 :             return true;
      63             :         }
      64           2 :         throw std::ios_base::failure(
      65           2 :             strprintf("BIP155 IPv4 address with length %u (should be %u)", address_size,
      66           6 :                       ADDR_IPV4_SIZE));
      67          13 :     case BIP155Network::IPV6:
      68          13 :         if (address_size == ADDR_IPV6_SIZE) {
      69          12 :             m_net = NET_IPV6;
      70          12 :             return true;
      71             :         }
      72           1 :         throw std::ios_base::failure(
      73           1 :             strprintf("BIP155 IPv6 address with length %u (should be %u)", address_size,
      74           3 :                       ADDR_IPV6_SIZE));
      75           2 :     case BIP155Network::TORV2:
      76           2 :         if (address_size == ADDR_TORV2_SIZE) {
      77           1 :             m_net = NET_ONION;
      78           1 :             return true;
      79             :         }
      80           1 :         throw std::ios_base::failure(
      81           1 :             strprintf("BIP155 TORv2 address with length %u (should be %u)", address_size,
      82           3 :                       ADDR_TORV2_SIZE));
      83           2 :     case BIP155Network::TORV3:
      84           2 :         if (address_size == ADDR_TORV3_SIZE) {
      85           1 :             m_net = NET_ONION;
      86           1 :             return true;
      87             :         }
      88           1 :         throw std::ios_base::failure(
      89           1 :             strprintf("BIP155 TORv3 address with length %u (should be %u)", address_size,
      90           3 :                       ADDR_TORV3_SIZE));
      91           2 :     case BIP155Network::I2P:
      92           2 :         if (address_size == ADDR_I2P_SIZE) {
      93           1 :             m_net = NET_I2P;
      94           1 :             return true;
      95             :         }
      96           1 :         throw std::ios_base::failure(
      97           1 :             strprintf("BIP155 I2P address with length %u (should be %u)", address_size,
      98           3 :                       ADDR_I2P_SIZE));
      99           2 :     case BIP155Network::CJDNS:
     100           2 :         if (address_size == ADDR_CJDNS_SIZE) {
     101           1 :             m_net = NET_CJDNS;
     102           1 :             return true;
     103             :         }
     104           1 :         throw std::ios_base::failure(
     105           1 :             strprintf("BIP155 CJDNS address with length %u (should be %u)", address_size,
     106           3 :                       ADDR_CJDNS_SIZE));
     107             :     }
     108             : 
     109             :     // Don't throw on addresses with unknown network ids (maybe from the future).
     110             :     // Instead silently drop them and have the unserialization code consume
     111             :     // subsequent ones which may be known to us.
     112             :     return false;
     113             : }
     114             : 
     115             : /**
     116             :  * Construct an unspecified IPv6 network address (::/128).
     117             :  *
     118             :  * @note This address is considered invalid by CNetAddr::IsValid()
     119             :  */
     120     3534570 : CNetAddr::CNetAddr() {}
     121             : 
     122           1 : void CNetAddr::SetIP(const CNetAddr& ipIn)
     123             : {
     124             :     // Size check.
     125           1 :     switch (ipIn.m_net) {
     126           0 :     case NET_IPV4:
     127           0 :         assert(ipIn.m_addr.size() == ADDR_IPV4_SIZE);
     128             :         break;
     129           1 :     case NET_IPV6:
     130           1 :         assert(ipIn.m_addr.size() == ADDR_IPV6_SIZE);
     131             :         break;
     132           0 :     case NET_ONION:
     133           0 :         assert(ipIn.m_addr.size() == ADDR_TORV2_SIZE || ipIn.m_addr.size() == ADDR_TORV3_SIZE);
     134             :         break;
     135           0 :     case NET_I2P:
     136           0 :         assert(ipIn.m_addr.size() == ADDR_I2P_SIZE);
     137             :         break;
     138           0 :     case NET_CJDNS:
     139           0 :         assert(ipIn.m_addr.size() == ADDR_CJDNS_SIZE);
     140             :         break;
     141           0 :     case NET_INTERNAL:
     142           0 :         assert(ipIn.m_addr.size() == ADDR_INTERNAL_SIZE);
     143             :         break;
     144           0 :     case NET_UNROUTABLE:
     145           0 :     case NET_MAX:
     146           0 :         assert(false);
     147             :     } // no default case, so the compiler can warn about missing cases
     148             : 
     149           1 :     m_net = ipIn.m_net;
     150           1 :     m_addr = ipIn.m_addr;
     151           1 : }
     152             : 
     153        6387 : void CNetAddr::SetLegacyIPv6(Span<const uint8_t> ipv6)
     154             : {
     155        6387 :     assert(ipv6.size() == ADDR_IPV6_SIZE);
     156             : 
     157        6387 :     size_t skip{0};
     158             : 
     159        6387 :     if (HasPrefix(ipv6, IPV4_IN_IPV6_PREFIX)) {
     160             :         // IPv4-in-IPv6
     161        2690 :         m_net = NET_IPV4;
     162        2690 :         skip = sizeof(IPV4_IN_IPV6_PREFIX);
     163        3697 :     } else if (HasPrefix(ipv6, TORV2_IN_IPV6_PREFIX)) {
     164             :         // TORv2-in-IPv6
     165           5 :         m_net = NET_ONION;
     166           5 :         skip = sizeof(TORV2_IN_IPV6_PREFIX);
     167        3692 :     } else if (HasPrefix(ipv6, INTERNAL_IN_IPV6_PREFIX)) {
     168             :         // Internal-in-IPv6
     169           1 :         m_net = NET_INTERNAL;
     170           1 :         skip = sizeof(INTERNAL_IN_IPV6_PREFIX);
     171             :     } else {
     172             :         // IPv6
     173        3691 :         m_net = NET_IPV6;
     174             :     }
     175             : 
     176        6387 :     m_addr.assign(ipv6.begin() + skip, ipv6.end());
     177        6387 : }
     178             : 
     179             : /**
     180             :  * Create an "internal" address that represents a name or FQDN. CAddrMan uses
     181             :  * these fake addresses to keep track of which DNS seeds were used.
     182             :  * @returns Whether or not the operation was successful.
     183             :  * @see NET_INTERNAL, INTERNAL_IN_IPV6_PREFIX, CNetAddr::IsInternal(), CNetAddr::IsRFC4193()
     184             :  */
     185         128 : bool CNetAddr::SetInternal(const std::string &name)
     186             : {
     187         128 :     if (name.empty()) {
     188             :         return false;
     189             :     }
     190         128 :     m_net = NET_INTERNAL;
     191         128 :     unsigned char hash[32] = {};
     192         128 :     CSHA256().Write((const unsigned char*)name.data(), name.size()).Finalize(hash);
     193         128 :     m_addr.assign(hash, hash + ADDR_INTERNAL_SIZE);
     194         128 :     return true;
     195             : }
     196             : 
     197             : namespace torv3 {
     198             : // https://gitweb.torproject.org/torspec.git/tree/rend-spec-v3.txt#n2135
     199             : static constexpr size_t CHECKSUM_LEN = 2;
     200             : static const unsigned char VERSION[] = {3};
     201             : static constexpr size_t TOTAL_LEN = ADDR_TORV3_SIZE + CHECKSUM_LEN + sizeof(VERSION);
     202             : 
     203           7 : static void Checksum(Span<const uint8_t> addr_pubkey, uint8_t (&checksum)[CHECKSUM_LEN])
     204             : {
     205             :     // TORv3 CHECKSUM = H(".onion checksum" | PUBKEY | VERSION)[:2]
     206           7 :     static const unsigned char prefix[] = ".onion checksum";
     207           7 :     static constexpr size_t prefix_len = 15;
     208             : 
     209           7 :     SHA3_256 hasher;
     210             : 
     211           7 :     hasher.Write(MakeSpan(prefix).first(prefix_len));
     212           7 :     hasher.Write(addr_pubkey);
     213           7 :     hasher.Write(VERSION);
     214             : 
     215           7 :     uint8_t checksum_full[SHA3_256::OUTPUT_SIZE];
     216             : 
     217           7 :     hasher.Finalize(checksum_full);
     218             : 
     219           7 :     memcpy(checksum, checksum_full, sizeof(checksum));
     220           7 : }
     221             : 
     222             : }; // namespace torv3
     223             : 
     224             : /**
     225             :  * Parse a TOR address and set this object to it.
     226             :  *
     227             :  * @returns Whether or not the operation was successful.
     228             :  *
     229             :  * @see CNetAddr::IsTor()
     230             :  */
     231      623067 : bool CNetAddr::SetSpecial(const std::string& str)
     232             : {
     233      623067 :     static const char* suffix{".onion"};
     234      623067 :     static constexpr size_t suffix_len{6};
     235             : 
     236     1245269 :     if (!ValidAsCString(str) || str.size() <= suffix_len ||
     237     1867476 :         str.substr(str.size() - suffix_len) != suffix) {
     238             :         return false;
     239             :     }
     240             : 
     241          17 :     bool invalid;
     242      623084 :     const auto& input = DecodeBase32(str.substr(0, str.size() - suffix_len).c_str(), &invalid);
     243             : 
     244          17 :     if (invalid) {
     245             :         return false;
     246             :     }
     247             : 
     248          16 :     switch (input.size()) {
     249          10 :     case ADDR_TORV2_SIZE:
     250          10 :         m_net = NET_ONION;
     251          10 :         m_addr.assign(input.begin(), input.end());
     252          10 :         return true;
     253           5 :     case torv3::TOTAL_LEN: {
     254           5 :         Span<const uint8_t> input_pubkey{input.data(), ADDR_TORV3_SIZE};
     255           5 :         Span<const uint8_t> input_checksum{input.data() + ADDR_TORV3_SIZE, torv3::CHECKSUM_LEN};
     256           5 :         Span<const uint8_t> input_version{input.data() + ADDR_TORV3_SIZE + torv3::CHECKSUM_LEN, sizeof(torv3::VERSION)};
     257             : 
     258           5 :         uint8_t calculated_checksum[torv3::CHECKSUM_LEN];
     259           5 :         torv3::Checksum(input_pubkey, calculated_checksum);
     260             : 
     261           5 :         if (input_checksum != calculated_checksum || input_version != torv3::VERSION) {
     262           2 :             return false;
     263             :         }
     264             : 
     265           3 :         m_net = NET_ONION;
     266           3 :         m_addr.assign(input_pubkey.begin(), input_pubkey.end());
     267           3 :         return true;
     268             :     }
     269             :     }
     270             : 
     271             :     return false;
     272           4 : }
     273             : 
     274      622908 : CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
     275             : {
     276      622908 :     m_net = NET_IPV4;
     277      622908 :     const uint8_t* ptr = reinterpret_cast<const uint8_t*>(&ipv4Addr);
     278      622908 :     m_addr.assign(ptr, ptr + ADDR_IPV4_SIZE);
     279      622908 : }
     280             : 
     281        1101 : CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr, const uint32_t scope)
     282             : {
     283        1101 :     SetLegacyIPv6(Span<const uint8_t>(reinterpret_cast<const uint8_t*>(&ipv6Addr), sizeof(ipv6Addr)));
     284        1101 :     scopeId = scope;
     285        1101 : }
     286             : 
     287         754 : bool CNetAddr::IsBindAny() const
     288             : {
     289         754 :     if (!IsIPv4() && !IsIPv6()) {
     290             :         return false;
     291             :     }
     292        4114 :     return std::all_of(m_addr.begin(), m_addr.end(), [](uint8_t b) { return b == 0; });
     293             : }
     294             : 
     295     5892311 : bool CNetAddr::IsIPv4() const { return m_net == NET_IPV4; }
     296             : 
     297     6717413 : bool CNetAddr::IsIPv6() const { return m_net == NET_IPV6; }
     298             : 
     299      561221 : bool CNetAddr::IsRFC1918() const
     300             : {
     301      561221 :     return IsIPv4() && (
     302     1122164 :         m_addr[0] == 10 ||
     303      561177 :         (m_addr[0] == 192 && m_addr[1] == 168) ||
     304      560932 :         (m_addr[0] == 172 && m_addr[1] >= 16 && m_addr[1] <= 31));
     305             : }
     306             : 
     307      559296 : bool CNetAddr::IsRFC2544() const
     308             : {
     309     1118575 :     return IsIPv4() && m_addr[0] == 198 && (m_addr[1] == 18 || m_addr[1] == 19);
     310             : }
     311             : 
     312      559295 : bool CNetAddr::IsRFC3927() const
     313             : {
     314      559295 :     return IsIPv4() && HasPrefix(m_addr, std::array<uint8_t, 2>{169, 254});
     315             : }
     316             : 
     317      559291 : bool CNetAddr::IsRFC6598() const
     318             : {
     319     1118563 :     return IsIPv4() && m_addr[0] == 100 && m_addr[1] >= 64 && m_addr[1] <= 127;
     320             : }
     321             : 
     322      559291 : bool CNetAddr::IsRFC5737() const
     323             : {
     324     1118443 :     return IsIPv4() && (HasPrefix(m_addr, std::array<uint8_t, 3>{192, 0, 2}) ||
     325     1118304 :                         HasPrefix(m_addr, std::array<uint8_t, 3>{198, 51, 100}) ||
     326      559152 :                         HasPrefix(m_addr, std::array<uint8_t, 3>{203, 0, 113}));
     327             : }
     328             : 
     329     1206164 : bool CNetAddr::IsRFC3849() const
     330             : {
     331     1206164 :     return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 4>{0x20, 0x01, 0x0D, 0xB8});
     332             : }
     333             : 
     334          50 : bool CNetAddr::IsRFC3964() const
     335             : {
     336          50 :     return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 2>{0x20, 0x02});
     337             : }
     338             : 
     339          55 : bool CNetAddr::IsRFC6052() const
     340             : {
     341          98 :     return IsIPv6() &&
     342          43 :            HasPrefix(m_addr, std::array<uint8_t, 12>{0x00, 0x64, 0xFF, 0x9B, 0x00, 0x00,
     343          55 :                                                      0x00, 0x00, 0x00, 0x00, 0x00, 0x00});
     344             : }
     345             : 
     346          46 : bool CNetAddr::IsRFC4380() const
     347             : {
     348          46 :     return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 4>{0x20, 0x01, 0x00, 0x00});
     349             : }
     350             : 
     351      559292 : bool CNetAddr::IsRFC4862() const
     352             : {
     353      559292 :     return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 8>{0xFE, 0x80, 0x00, 0x00,
     354      559292 :                                                                 0x00, 0x00, 0x00, 0x00});
     355             : }
     356             : 
     357      559292 : bool CNetAddr::IsRFC4193() const
     358             : {
     359      559396 :     return IsIPv6() && (m_addr[0] & 0xFE) == 0xFC;
     360             : }
     361             : 
     362          56 : bool CNetAddr::IsRFC6145() const
     363             : {
     364         100 :     return IsIPv6() &&
     365          44 :            HasPrefix(m_addr, std::array<uint8_t, 12>{0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     366          56 :                                                      0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00});
     367             : }
     368             : 
     369      559292 : bool CNetAddr::IsRFC4843() const
     370             : {
     371      559292 :     return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 3>{0x20, 0x01, 0x00}) &&
     372          22 :            (m_addr[3] & 0xF0) == 0x10;
     373             : }
     374             : 
     375      559292 : bool CNetAddr::IsRFC7343() const
     376             : {
     377      559292 :     return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 3>{0x20, 0x01, 0x00}) &&
     378          22 :            (m_addr[3] & 0xF0) == 0x20;
     379             : }
     380             : 
     381           8 : bool CNetAddr::IsHeNet() const
     382             : {
     383           8 :     return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 4>{0x20, 0x01, 0x04, 0x70});
     384             : }
     385             : 
     386             : /**
     387             :  * Check whether this object represents a TOR address.
     388             :  * @see CNetAddr::SetSpecial(const std::string &)
     389             :  */
     390        3000 : bool CNetAddr::IsTor() const { return m_net == NET_ONION; }
     391             : 
     392             : /**
     393             :  * Check whether this object represents an I2P address.
     394             :  */
     395        2991 : bool CNetAddr::IsI2P() const { return m_net == NET_I2P; }
     396             : 
     397             : /**
     398             :  * Check whether this object represents a CJDNS address.
     399             :  */
     400           9 : bool CNetAddr::IsCJDNS() const { return m_net == NET_CJDNS; }
     401             : 
     402      716399 : bool CNetAddr::IsLocal() const
     403             : {
     404             :     // IPv4 loopback (127.0.0.0/8 or 0.0.0.0/8)
     405     1394862 :     if (IsIPv4() && (m_addr[0] == 127 || m_addr[0] == 0)) {
     406             :         return true;
     407             :     }
     408             : 
     409             :     // IPv6 loopback (::1/128)
     410      385974 :     static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
     411      423868 :     if (IsIPv6() && memcmp(m_addr.data(), pchLocal, sizeof(pchLocal)) == 0) {
     412           2 :         return true;
     413             :     }
     414             : 
     415             :    return false;
     416             : }
     417             : 
     418     1439996 : bool CNetAddr::IsValid() const
     419             : {
     420             :     // Cleanup 3-byte shifted addresses caused by garbage in size field
     421             :     // of addr messages from versions before 0.2.9 checksum.
     422             :     // Two consecutive addr messages look like this:
     423             :     // header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26...
     424             :     // so if the first length field is garbled, it reads the second batch
     425             :     // of addr misaligned by 3 bytes.
     426     1673988 :     if (IsIPv6() && memcmp(m_addr.data(), IPV4_IN_IPV6_PREFIX.data() + 3,
     427             :                            sizeof(IPV4_IN_IPV6_PREFIX) - 3) == 0) {
     428             :         return false;
     429             :     }
     430             : 
     431             :     // unspecified IPv6 address (::/128)
     432     1439996 :     unsigned char ipNone6[16] = {};
     433     1673988 :     if (IsIPv6() && memcmp(m_addr.data(), ipNone6, sizeof(ipNone6)) == 0) {
     434             :         return false;
     435             :     }
     436             : 
     437             :     // documentation IPv6 address
     438     1206163 :     if (IsRFC3849())
     439             :         return false;
     440             : 
     441     1206163 :     if (IsInternal())
     442             :         return false;
     443             : 
     444     1206162 :     if (IsIPv4()) {
     445     2411920 :         const uint32_t addr = ReadBE32(m_addr.data());
     446     1205955 :         if (addr == INADDR_ANY || addr == INADDR_NONE) {
     447           7 :             return false;
     448             :         }
     449             :     }
     450             : 
     451             :     return true;
     452             : }
     453             : 
     454      675105 : bool CNetAddr::IsRoutable() const
     455             : {
     456      675105 :     return IsValid() && !(IsRFC1918() || IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsRFC7343() || IsLocal() || IsInternal());
     457             : }
     458             : 
     459             : /**
     460             :  * @returns Whether or not this is a dummy address that represents a name.
     461             :  *
     462             :  * @see CNetAddr::SetInternal(const std::string &)
     463             :  */
     464     2738320 : bool CNetAddr::IsInternal() const
     465             : {
     466     2738320 :    return m_net == NET_INTERNAL;
     467             : }
     468             : 
     469       16031 : bool CNetAddr::IsAddrV1Compatible() const
     470             : {
     471       16031 :     switch (m_net) {
     472             :     case NET_IPV4:
     473             :     case NET_IPV6:
     474             :     case NET_INTERNAL:
     475             :         return true;
     476           4 :     case NET_ONION:
     477           6 :         return m_addr.size() == ADDR_TORV2_SIZE;
     478           2 :     case NET_I2P:
     479           2 :     case NET_CJDNS:
     480           2 :         return false;
     481           0 :     case NET_UNROUTABLE: // m_net is never and should not be set to NET_UNROUTABLE
     482           0 :     case NET_MAX:        // m_net is never and should not be set to NET_MAX
     483           0 :         assert(false);
     484             :     } // no default case, so the compiler can warn about missing cases
     485             : 
     486           0 :     assert(false);
     487             : }
     488             : 
     489        2661 : enum Network CNetAddr::GetNetwork() const
     490             : {
     491        2661 :     if (IsInternal())
     492             :         return NET_INTERNAL;
     493             : 
     494        2660 :     if (!IsRoutable())
     495             :         return NET_UNROUTABLE;
     496             : 
     497         779 :     return m_net;
     498             : }
     499             : 
     500           1 : static std::string IPv6ToString(Span<const uint8_t> a)
     501             : {
     502           1 :     assert(a.size() == ADDR_IPV6_SIZE);
     503             :     // clang-format off
     504           1 :     return strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
     505           2 :                      ReadBE16(&a[0]),
     506           2 :                      ReadBE16(&a[2]),
     507           2 :                      ReadBE16(&a[4]),
     508           2 :                      ReadBE16(&a[6]),
     509           2 :                      ReadBE16(&a[8]),
     510           2 :                      ReadBE16(&a[10]),
     511           1 :                      ReadBE16(&a[12]),
     512           1 :                      ReadBE16(&a[14]));
     513             :     // clang-format on
     514             : }
     515             : 
     516      334563 : std::string CNetAddr::ToStringIP() const
     517             : {
     518      334563 :     switch (m_net) {
     519      334551 :     case NET_IPV4:
     520      334551 :     case NET_IPV6: {
     521      669102 :         CService serv(*this, 0);
     522      334551 :         struct sockaddr_storage sockaddr;
     523      334551 :         socklen_t socklen = sizeof(sockaddr);
     524      334551 :         if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) {
     525      334551 :             char name[1025] = "";
     526      334551 :             if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name,
     527             :                              sizeof(name), nullptr, 0, NI_NUMERICHOST))
     528      334551 :                 return std::string(name);
     529             :         }
     530           0 :         if (m_net == NET_IPV4) {
     531           0 :             return strprintf("%u.%u.%u.%u", m_addr[0], m_addr[1], m_addr[2], m_addr[3]);
     532             :         }
     533           0 :         return IPv6ToString(m_addr);
     534             :     }
     535           8 :     case NET_ONION:
     536          10 :         switch (m_addr.size()) {
     537           6 :         case ADDR_TORV2_SIZE:
     538          18 :             return EncodeBase32(m_addr) + ".onion";
     539           2 :         case ADDR_TORV3_SIZE: {
     540             : 
     541           2 :             uint8_t checksum[torv3::CHECKSUM_LEN];
     542           4 :             torv3::Checksum(m_addr, checksum);
     543             : 
     544             :             // TORv3 onion_address = base32(PUBKEY | CHECKSUM | VERSION) + ".onion"
     545           8 :             prevector<torv3::TOTAL_LEN, uint8_t> address{m_addr.begin(), m_addr.end()};
     546           4 :             address.insert(address.end(), checksum, checksum + torv3::CHECKSUM_LEN);
     547           4 :             address.insert(address.end(), torv3::VERSION, torv3::VERSION + sizeof(torv3::VERSION));
     548             : 
     549           6 :             return EncodeBase32(address) + ".onion";
     550             :         }
     551           0 :         default:
     552           0 :             assert(false);
     553             :         }
     554           1 :     case NET_I2P:
     555           3 :         return EncodeBase32(m_addr, false /* don't pad with = */) + ".b32.i2p";
     556           1 :     case NET_CJDNS:
     557           2 :         return IPv6ToString(m_addr);
     558           2 :     case NET_INTERNAL:
     559           6 :         return EncodeBase32(m_addr) + ".internal";
     560           0 :     case NET_UNROUTABLE: // m_net is never and should not be set to NET_UNROUTABLE
     561           0 :     case NET_MAX:        // m_net is never and should not be set to NET_MAX
     562           0 :         assert(false);
     563             :     } // no default case, so the compiler can warn about missing cases
     564             : 
     565           0 :     assert(false);
     566             : }
     567             : 
     568       10336 : std::string CNetAddr::ToString() const
     569             : {
     570       10336 :     return ToStringIP();
     571             : }
     572             : 
     573      256954 : bool operator==(const CNetAddr& a, const CNetAddr& b)
     574             : {
     575      256954 :     return a.m_net == b.m_net && a.m_addr == b.m_addr;
     576             : }
     577             : 
     578       18104 : bool operator!=(const CNetAddr& a, const CNetAddr& b)
     579             : {
     580       18104 :     return a.m_net != b.m_net || a.m_addr != b.m_addr;
     581             : }
     582             : 
     583      722602 : bool operator<(const CNetAddr& a, const CNetAddr& b)
     584             : {
     585      722602 :     return std::tie(a.m_net, a.m_addr) < std::tie(b.m_net, b.m_addr);
     586             : }
     587             : 
     588      333355 : bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const
     589             : {
     590      333355 :     if (!IsIPv4())
     591             :         return false;
     592      333355 :     assert(sizeof(*pipv4Addr) == m_addr.size());
     593      666710 :     memcpy(pipv4Addr, m_addr.data(), m_addr.size());
     594      333355 :     return true;
     595             : }
     596             : 
     597             : /**
     598             :  * Try to get our IPv6 address.
     599             :  *
     600             :  * @param[out] pipv6Addr The in6_addr struct to which to copy.
     601             :  *
     602             :  * @returns Whether or not the operation was successful, in particular, whether
     603             :  *          or not our address was an IPv6 address.
     604             :  *
     605             :  * @see CNetAddr::IsIPv6()
     606             :  */
     607        3386 : bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const
     608             : {
     609        3386 :     if (!IsIPv6()) {
     610             :         return false;
     611             :     }
     612        3386 :     assert(sizeof(*pipv6Addr) == m_addr.size());
     613        6772 :     memcpy(pipv6Addr, m_addr.data(), m_addr.size());
     614        3386 :     return true;
     615             : }
     616             : 
     617      156027 : bool CNetAddr::HasLinkedIPv4() const
     618             : {
     619      156027 :     return IsRoutable() && (IsIPv4() || IsRFC6145() || IsRFC6052() || IsRFC3964() || IsRFC4380());
     620             : }
     621             : 
     622       36253 : uint32_t CNetAddr::GetLinkedIPv4() const
     623             : {
     624       36253 :     if (IsIPv4()) {
     625       72498 :         return ReadBE32(m_addr.data());
     626           4 :     } else if (IsRFC6052() || IsRFC6145()) {
     627             :         // mapped IPv4, SIIT translated IPv4: the IPv4 address is the last 4 bytes of the address
     628           4 :         return ReadBE32(MakeSpan(m_addr).last(ADDR_IPV4_SIZE).data());
     629           2 :     } else if (IsRFC3964()) {
     630             :         // 6to4 tunneled IPv4: the IPv4 address is in bytes 2-6
     631           2 :         return ReadBE32(MakeSpan(m_addr).subspan(2, ADDR_IPV4_SIZE).data());
     632           1 :     } else if (IsRFC4380()) {
     633             :         // Teredo tunneled IPv4: the IPv4 address is in the last 4 bytes of the address, but bitflipped
     634           2 :         return ~ReadBE32(MakeSpan(m_addr).last(ADDR_IPV4_SIZE).data());
     635             :     }
     636           0 :     assert(false);
     637             : }
     638             : 
     639      432279 : Network CNetAddr::GetNetClass() const
     640             : {
     641             :     // Make sure that if we return NET_IPV6, then IsIPv6() is true. The callers expect that.
     642             : 
     643             :     // Check for "internal" first because such addresses are also !IsRoutable()
     644             :     // and we don't want to return NET_UNROUTABLE in that case.
     645      432279 :     if (IsInternal()) {
     646             :         return NET_INTERNAL;
     647             :     }
     648      432277 :     if (!IsRoutable()) {
     649             :         return NET_UNROUTABLE;
     650             :     }
     651      119762 :     if (HasLinkedIPv4()) {
     652             :         return NET_IPV4;
     653             :     }
     654          29 :     return m_net;
     655             : }
     656             : 
     657      237847 : uint32_t CNetAddr::GetMappedAS(const std::vector<bool> &asmap) const {
     658      237847 :     uint32_t net_class = GetNetClass();
     659      237847 :     if (asmap.size() == 0 || (net_class != NET_IPV4 && net_class != NET_IPV6)) {
     660             :         return 0; // Indicates not found, safe because AS0 is reserved per RFC7607.
     661             :     }
     662      244258 :     std::vector<bool> ip_bits(128);
     663        6411 :     if (HasLinkedIPv4()) {
     664             :         // For lookup, treat as if it was just an IPv4 address (IPV4_IN_IPV6_PREFIX + IPv4 bits)
     665       83343 :         for (int8_t byte_i = 0; byte_i < 12; ++byte_i) {
     666      692388 :             for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) {
     667     1230910 :                 ip_bits[byte_i * 8 + bit_i] = (IPV4_IN_IPV6_PREFIX[byte_i] >> (7 - bit_i)) & 1;
     668             :             }
     669             :         }
     670        6411 :         uint32_t ipv4 = GetLinkedIPv4();
     671      211563 :         for (int i = 0; i < 32; ++i) {
     672      410304 :             ip_bits[96 + i] = (ipv4 >> (31 - i)) & 1;
     673             :         }
     674             :     } else {
     675             :         // Use all 128 bits of the IPv6 address otherwise
     676           0 :         assert(IsIPv6());
     677           0 :         for (int8_t byte_i = 0; byte_i < 16; ++byte_i) {
     678           0 :             uint8_t cur_byte = m_addr[byte_i];
     679           0 :             for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) {
     680           0 :                 ip_bits[byte_i * 8 + bit_i] = (cur_byte >> (7 - bit_i)) & 1;
     681             :             }
     682             :         }
     683             :     }
     684        6411 :     uint32_t mapped_as = Interpret(asmap, ip_bits);
     685        6411 :     return mapped_as;
     686             : }
     687             : 
     688             : /**
     689             :  * Get the canonical identifier of our network group
     690             :  *
     691             :  * The groups are assigned in a way where it should be costly for an attacker to
     692             :  * obtain addresses with many different group identifiers, even if it is cheap
     693             :  * to obtain addresses with the same identifier.
     694             :  *
     695             :  * @note No two connections will be attempted to addresses with the same network
     696             :  *       group.
     697             :  */
     698      159049 : std::vector<unsigned char> CNetAddr::GetGroup(const std::vector<bool> &asmap) const
     699             : {
     700      159049 :     std::vector<unsigned char> vchRet;
     701      159049 :     uint32_t net_class = GetNetClass();
     702             :     // If non-empty asmap is supplied and the address is IPv4/IPv6,
     703             :     // return ASN to be used for bucketing.
     704      159049 :     uint32_t asn = GetMappedAS(asmap);
     705      159049 :     if (asn != 0) { // Either asmap was empty, or address has non-asmappable net class (e.g. TOR).
     706        3623 :         vchRet.push_back(NET_IPV6); // IPv4 and IPv6 with same ASN should be in the same bucket
     707       18115 :         for (int i = 0; i < 4; i++) {
     708       14492 :             vchRet.push_back((asn >> (8 * i)) & 0xFF);
     709             :         }
     710             :         return vchRet;
     711             :     }
     712             : 
     713      155426 :     vchRet.push_back(net_class);
     714      155426 :     int nBits{0};
     715             : 
     716      155426 :     if (IsLocal()) {
     717             :         // all local addresses belong to the same group
     718       67635 :     } else if (IsInternal()) {
     719             :         // all internal-usage addresses get their own group
     720             :         nBits = ADDR_INTERNAL_SIZE * 8;
     721       67634 :     } else if (!IsRoutable()) {
     722             :         // all other unroutable addresses belong to the same group
     723       29854 :     } else if (HasLinkedIPv4()) {
     724             :         // IPv4 addresses (and mapped IPv4 addresses) use /16 groups
     725       29842 :         uint32_t ipv4 = GetLinkedIPv4();
     726       29842 :         vchRet.push_back((ipv4 >> 24) & 0xFF);
     727       29842 :         vchRet.push_back((ipv4 >> 16) & 0xFF);
     728       29842 :         return vchRet;
     729          12 :     } else if (IsTor() || IsI2P() || IsCJDNS()) {
     730             :         nBits = 4;
     731           8 :     } else if (IsHeNet()) {
     732             :         // for he.net, use /36 groups
     733             :         nBits = 36;
     734             :     } else {
     735             :         // for the rest of the IPv6 network, use /32 groups
     736           7 :         nBits = 32;
     737             :     }
     738             : 
     739             :     // Push our address onto vchRet.
     740      125584 :     const size_t num_bytes = nBits / 8;
     741      251168 :     vchRet.insert(vchRet.end(), m_addr.begin(), m_addr.begin() + num_bytes);
     742      125584 :     nBits %= 8;
     743             :     // ...for the last byte, push nBits and for the rest of the byte push 1's
     744      125584 :     if (nBits > 0) {
     745           5 :         assert(num_bytes < m_addr.size());
     746          10 :         vchRet.push_back(m_addr[num_bytes] | ((1 << (8 - nBits)) - 1));
     747             :     }
     748             : 
     749             :     return vchRet;
     750             : }
     751             : 
     752       15766 : std::vector<unsigned char> CNetAddr::GetAddrBytes() const
     753             : {
     754       15766 :     if (IsAddrV1Compatible()) {
     755       15766 :         uint8_t serialized[V1_SERIALIZATION_SIZE];
     756       15766 :         SerializeV1Array(serialized);
     757       15766 :         return {std::begin(serialized), std::end(serialized)};
     758             :     }
     759           0 :     return std::vector<unsigned char>(m_addr.begin(), m_addr.end());
     760             : }
     761             : 
     762          21 : uint64_t CNetAddr::GetHash() const
     763             : {
     764          63 :     uint256 hash = Hash(m_addr.begin(), m_addr.end());
     765          21 :     uint64_t nRet;
     766          21 :     memcpy(&nRet, &hash, sizeof(nRet));
     767          21 :     return nRet;
     768             : }
     769             : 
     770             : // private extensions to enum Network, only returned by GetExtNetwork,
     771             : // and only used in GetReachabilityFrom
     772             : static const int NET_UNKNOWN = NET_MAX + 0;
     773             : static const int NET_TEREDO  = NET_MAX + 1;
     774           0 : int static GetExtNetwork(const CNetAddr *addr)
     775             : {
     776           0 :     if (addr == nullptr)
     777             :         return NET_UNKNOWN;
     778           0 :     if (addr->IsRFC4380())
     779             :         return NET_TEREDO;
     780           0 :     return addr->GetNetwork();
     781             : }
     782             : 
     783             : /** Calculates a metric for how reachable (*this) is from a given partner */
     784           1 : int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
     785             : {
     786           1 :     enum Reachability {
     787             :         REACH_UNREACHABLE,
     788             :         REACH_DEFAULT,
     789             :         REACH_TEREDO,
     790             :         REACH_IPV6_WEAK,
     791             :         REACH_IPV4,
     792             :         REACH_IPV6_STRONG,
     793             :         REACH_PRIVATE
     794             :     };
     795             : 
     796           1 :     if (!IsRoutable() || IsInternal())
     797             :         return REACH_UNREACHABLE;
     798             : 
     799           0 :     int ourNet = GetExtNetwork(this);
     800           0 :     int theirNet = GetExtNetwork(paddrPartner);
     801           0 :     bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145();
     802             : 
     803           0 :     switch(theirNet) {
     804           0 :     case NET_IPV4:
     805           0 :         switch(ourNet) {
     806             :         default:       return REACH_DEFAULT;
     807           0 :         case NET_IPV4: return REACH_IPV4;
     808             :         }
     809           0 :     case NET_IPV6:
     810           0 :         switch(ourNet) {
     811             :         default:         return REACH_DEFAULT;
     812           0 :         case NET_TEREDO: return REACH_TEREDO;
     813           0 :         case NET_IPV4:   return REACH_IPV4;
     814           0 :         case NET_IPV6:   return fTunnel ? REACH_IPV6_WEAK : REACH_IPV6_STRONG; // only prefer giving our IPv6 address if it's not tunnelled
     815             :         }
     816           0 :     case NET_ONION:
     817           0 :         switch(ourNet) {
     818             :         default:         return REACH_DEFAULT;
     819           0 :         case NET_IPV4:   return REACH_IPV4; // Tor users can connect to IPv4 as well
     820           0 :         case NET_ONION:    return REACH_PRIVATE;
     821             :         }
     822           0 :     case NET_TEREDO:
     823           0 :         switch(ourNet) {
     824             :         default:          return REACH_DEFAULT;
     825           0 :         case NET_TEREDO:  return REACH_TEREDO;
     826           0 :         case NET_IPV6:    return REACH_IPV6_WEAK;
     827           0 :         case NET_IPV4:    return REACH_IPV4;
     828             :         }
     829           0 :     case NET_UNKNOWN:
     830           0 :     case NET_UNROUTABLE:
     831           0 :     default:
     832           0 :         switch(ourNet) {
     833             :         default:          return REACH_DEFAULT;
     834           0 :         case NET_TEREDO:  return REACH_TEREDO;
     835           0 :         case NET_IPV6:    return REACH_IPV6_WEAK;
     836           0 :         case NET_IPV4:    return REACH_IPV4;
     837           0 :         case NET_ONION:     return REACH_PRIVATE; // either from Tor, or don't care about our address
     838             :         }
     839             :     }
     840             : }
     841             : 
     842     2101426 : CService::CService() : port(0)
     843             : {
     844     2101426 : }
     845             : 
     846      949654 : CService::CService(const CNetAddr& cip, uint16_t portIn) : CNetAddr(cip), port(portIn)
     847             : {
     848      949654 : }
     849             : 
     850           3 : CService::CService(const struct in_addr& ipv4Addr, uint16_t portIn) : CNetAddr(ipv4Addr), port(portIn)
     851             : {
     852           3 : }
     853             : 
     854           2 : CService::CService(const struct in6_addr& ipv6Addr, uint16_t portIn) : CNetAddr(ipv6Addr), port(portIn)
     855             : {
     856           2 : }
     857             : 
     858         791 : CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port))
     859             : {
     860         791 :     assert(addr.sin_family == AF_INET);
     861         791 : }
     862             : 
     863           0 : CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr, addr.sin6_scope_id), port(ntohs(addr.sin6_port))
     864             : {
     865           0 :    assert(addr.sin6_family == AF_INET6);
     866           0 : }
     867             : 
     868         791 : bool CService::SetSockAddr(const struct sockaddr *paddr)
     869             : {
     870         791 :     switch (paddr->sa_family) {
     871         791 :     case AF_INET:
     872         791 :         *this = CService(*(const struct sockaddr_in*)paddr);
     873         791 :         return true;
     874           0 :     case AF_INET6:
     875           0 :         *this = CService(*(const struct sockaddr_in6*)paddr);
     876           0 :         return true;
     877             :     default:
     878             :         return false;
     879             :     }
     880             : }
     881             : 
     882       10881 : uint16_t CService::GetPort() const
     883             : {
     884       10881 :     return port;
     885             : }
     886             : 
     887       38217 : bool operator==(const CService& a, const CService& b)
     888             : {
     889       76434 :     return static_cast<CNetAddr>(a) == static_cast<CNetAddr>(b) && a.port == b.port;
     890             : }
     891             : 
     892       18104 : bool operator!=(const CService& a, const CService& b)
     893             : {
     894       36208 :     return static_cast<CNetAddr>(a) != static_cast<CNetAddr>(b) || a.port != b.port;
     895             : }
     896             : 
     897      206683 : bool operator<(const CService& a, const CService& b)
     898             : {
     899      769526 :     return static_cast<CNetAddr>(a) < static_cast<CNetAddr>(b) || (static_cast<CNetAddr>(a) == static_cast<CNetAddr>(b) && a.port < b.port);
     900             : }
     901             : 
     902      336741 : bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const
     903             : {
     904      336741 :     if (IsIPv4()) {
     905      333355 :         if (*addrlen < (socklen_t)sizeof(struct sockaddr_in))
     906             :             return false;
     907      333355 :         *addrlen = sizeof(struct sockaddr_in);
     908      333355 :         struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr;
     909      333355 :         memset(paddrin, 0, *addrlen);
     910      333355 :         if (!GetInAddr(&paddrin->sin_addr))
     911             :             return false;
     912      333355 :         paddrin->sin_family = AF_INET;
     913      333355 :         paddrin->sin_port = htons(port);
     914      333355 :         return true;
     915             :     }
     916        3386 :     if (IsIPv6()) {
     917        3386 :         if (*addrlen < (socklen_t)sizeof(struct sockaddr_in6))
     918             :             return false;
     919        3386 :         *addrlen = sizeof(struct sockaddr_in6);
     920        3386 :         struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr;
     921        3386 :         memset(paddrin6, 0, *addrlen);
     922        3386 :         if (!GetIn6Addr(&paddrin6->sin6_addr))
     923             :             return false;
     924        3386 :         paddrin6->sin6_scope_id = scopeId;
     925        3386 :         paddrin6->sin6_family = AF_INET6;
     926        3386 :         paddrin6->sin6_port = htons(port);
     927        3386 :         return true;
     928             :     }
     929             :     return false;
     930             : }
     931             : 
     932       15154 : std::vector<unsigned char> CService::GetKey() const
     933             : {
     934       15154 :     auto key = GetAddrBytes();
     935       15154 :     key.push_back(port / 0x100); // most significant byte of our port
     936       15154 :     key.push_back(port & 0x0FF); // least significant byte of our port
     937       15154 :     return key;
     938             : }
     939             : 
     940      305733 : std::string CService::ToStringPort() const
     941             : {
     942      305733 :     return strprintf("%u", port);
     943             : }
     944             : 
     945      305733 : std::string CService::ToStringIPPort() const
     946             : {
     947      305733 :     if (IsIPv4() || IsTor() || IsI2P() || IsInternal()) {
     948      605502 :         return ToStringIP() + ":" + ToStringPort();
     949             :     } else {
     950        5964 :         return "[" + ToStringIP() + "]:" + ToStringPort();
     951             :     }
     952             : }
     953             : 
     954      303429 : std::string CService::ToString() const
     955             : {
     956      303429 :     return ToStringIPPort();
     957             : }
     958             : 
     959        1074 : CSubNet::CSubNet():
     960        1074 :     valid(false)
     961             : {
     962        1074 :     memset(netmask, 0, sizeof(netmask));
     963        1074 : }
     964             : 
     965         413 : CSubNet::CSubNet(const CNetAddr& addr, uint8_t mask) : CSubNet()
     966             : {
     967         413 :     valid = (addr.IsIPv4() && mask <= ADDR_IPV4_SIZE * 8) ||
     968          13 :             (addr.IsIPv6() && mask <= ADDR_IPV6_SIZE * 8);
     969         413 :     if (!valid) {
     970             :         return;
     971             :     }
     972             : 
     973         410 :     assert(mask <= sizeof(netmask) * 8);
     974             : 
     975         410 :     network = addr;
     976             : 
     977         410 :     uint8_t n = mask;
     978        2170 :     for (size_t i = 0; i < network.m_addr.size(); ++i) {
     979        1760 :         const uint8_t bits = n < 8 ? n : 8;
     980        1760 :         netmask[i] = (uint8_t)((uint8_t)0xFF << (8 - bits)); // Set first bits.
     981        1760 :         network.m_addr[i] &= netmask[i]; // Normalize network according to netmask.
     982        1760 :         n -= bits;
     983             :     }
     984             : }
     985             : 
     986             : /**
     987             :  * @returns The number of 1-bits in the prefix of the specified subnet mask. If
     988             :  *          the specified subnet mask is not a valid one, -1.
     989             :  */
     990        6886 : static inline int NetmaskBits(uint8_t x)
     991             : {
     992        6886 :     switch(x) {
     993             :     case 0x00: return 0;
     994           8 :     case 0x80: return 1;
     995           8 :     case 0xc0: return 2;
     996          11 :     case 0xe0: return 3;
     997           8 :     case 0xf0: return 4;
     998           8 :     case 0xf8: return 5;
     999          10 :     case 0xfc: return 6;
    1000           9 :     case 0xfe: return 7;
    1001        6714 :     case 0xff: return 8;
    1002           2 :     default: return -1;
    1003             :     }
    1004             : }
    1005             : 
    1006          50 : CSubNet::CSubNet(const CNetAddr& addr, const CNetAddr& mask) : CSubNet()
    1007             : {
    1008          50 :     valid = (addr.IsIPv4() || addr.IsIPv6()) && addr.m_net == mask.m_net;
    1009          50 :     if (!valid) {
    1010             :         return;
    1011             :     }
    1012             :     // Check if `mask` contains 1-bits after 0-bits (which is an invalid netmask).
    1013          47 :     bool zeros_found = false;
    1014         375 :     for (auto b : mask.m_addr) {
    1015         238 :         const int num_bits = NetmaskBits(b);
    1016         238 :         if (num_bits == -1 || (zeros_found && num_bits != 0)) {
    1017           4 :             valid = false;
    1018           4 :             return;
    1019             :         }
    1020         234 :         if (num_bits < 8) {
    1021         138 :             zeros_found = true;
    1022             :         }
    1023             :     }
    1024             : 
    1025          43 :     assert(mask.m_addr.size() <= sizeof(netmask));
    1026             : 
    1027          43 :     memcpy(netmask, mask.m_addr.data(), mask.m_addr.size());
    1028             : 
    1029          43 :     network = addr;
    1030             : 
    1031             :     // Normalize network according to netmask
    1032         263 :     for (size_t x = 0; x < network.m_addr.size(); ++x) {
    1033         440 :         network.m_addr[x] &= netmask[x];
    1034             :     }
    1035             : }
    1036             : 
    1037         453 : CSubNet::CSubNet(const CNetAddr& addr) : CSubNet()
    1038             : {
    1039         453 :     valid = addr.IsIPv4() || addr.IsIPv6();
    1040         453 :     if (!valid) {
    1041             :         return;
    1042             :     }
    1043             : 
    1044         452 :     assert(addr.m_addr.size() <= sizeof(netmask));
    1045             : 
    1046         452 :     memset(netmask, 0xFF, addr.m_addr.size());
    1047             : 
    1048         452 :     network = addr;
    1049             : }
    1050             : 
    1051      298439 : bool CSubNet::Match(const CNetAddr &addr) const
    1052             : {
    1053      298439 :     if (!valid || !addr.IsValid() || network.m_net != addr.m_net)
    1054          17 :         return false;
    1055      298422 :     assert(network.m_addr.size() == addr.m_addr.size());
    1056     1492158 :     for (size_t x = 0; x < addr.m_addr.size(); ++x) {
    1057     3581265 :         if ((addr.m_addr[x] & netmask[x]) != network.m_addr[x]) {
    1058             :             return false;
    1059             :         }
    1060             :     }
    1061             :     return true;
    1062             : }
    1063             : 
    1064         824 : std::string CSubNet::ToString() const
    1065             : {
    1066         824 :     assert(network.m_addr.size() <= sizeof(netmask));
    1067             : 
    1068         824 :     uint8_t cidr = 0;
    1069             : 
    1070        7472 :     for (size_t i = 0; i < network.m_addr.size(); ++i) {
    1071        7066 :         if (netmask[i] == 0x00) {
    1072             :             break;
    1073             :         }
    1074        6648 :         cidr += NetmaskBits(netmask[i]);
    1075             :     }
    1076             : 
    1077        1648 :     return network.ToString() + strprintf("/%u", cidr);
    1078             : }
    1079             : 
    1080         224 : bool CSubNet::IsValid() const
    1081             : {
    1082         224 :     return valid;
    1083             : }
    1084             : 
    1085           2 : bool operator==(const CSubNet& a, const CSubNet& b)
    1086             : {
    1087           2 :     return a.valid == b.valid && a.network == b.network && !memcmp(a.netmask, b.netmask, 16);
    1088             : }
    1089             : 
    1090           1 : bool operator!=(const CSubNet& a, const CSubNet& b)
    1091             : {
    1092           1 :     return !(a==b);
    1093             : }
    1094             : 
    1095          69 : bool operator<(const CSubNet& a, const CSubNet& b)
    1096             : {
    1097          69 :     return (a.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));
    1098             : }

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