git / moonbite-core / src/netaddress.cpp · raw
// Copyright (c) 2009-2010 Satoshi Nakamoto// Copyright (c) 2009-2020 The Bitcoin Core developers// Distributed under the MIT software license, see the accompanying// file COPYING or http://www.opensource.org/licenses/mit-license.php.#include <netaddress.h>#include <crypto/common.h>#include <crypto/sha3.h>#include <hash.h>#include <prevector.h>#include <tinyformat.h>#include <util/asmap.h>#include <util/strencodings.h>#include <util/string.h>#include <algorithm>#include <array>#include <cstdint>#include <ios>#include <iterator>#include <tuple>constexpr size_t CNetAddr::V1_SERIALIZATION_SIZE;constexpr size_t CNetAddr::MAX_ADDRV2_SIZE;CNetAddr::BIP155Network CNetAddr::GetBIP155Network() const{ switch (m_net) { case NET_IPV4: return BIP155Network::IPV4; case NET_IPV6: return BIP155Network::IPV6; case NET_ONION: switch (m_addr.size()) { case ADDR_TORV2_SIZE: return BIP155Network::TORV2; case ADDR_TORV3_SIZE: return BIP155Network::TORV3; default: assert(false); } case NET_I2P: return BIP155Network::I2P; case NET_CJDNS: return BIP155Network::CJDNS; case NET_INTERNAL: // should have been handled before calling this function case NET_UNROUTABLE: // m_net is never and should not be set to NET_UNROUTABLE case NET_MAX: // m_net is never and should not be set to NET_MAX assert(false); } // no default case, so the compiler can warn about missing cases assert(false);}bool CNetAddr::SetNetFromBIP155Network(uint8_t possible_bip155_net, size_t address_size){ switch (possible_bip155_net) { case BIP155Network::IPV4: if (address_size == ADDR_IPV4_SIZE) { m_net = NET_IPV4; return true; } throw std::ios_base::failure( strprintf("BIP155 IPv4 address with length %u (should be %u)", address_size, ADDR_IPV4_SIZE)); case BIP155Network::IPV6: if (address_size == ADDR_IPV6_SIZE) { m_net = NET_IPV6; return true; } throw std::ios_base::failure( strprintf("BIP155 IPv6 address with length %u (should be %u)", address_size, ADDR_IPV6_SIZE)); case BIP155Network::TORV2: if (address_size == ADDR_TORV2_SIZE) { m_net = NET_ONION; return true; } throw std::ios_base::failure( strprintf("BIP155 TORv2 address with length %u (should be %u)", address_size, ADDR_TORV2_SIZE)); case BIP155Network::TORV3: if (address_size == ADDR_TORV3_SIZE) { m_net = NET_ONION; return true; } throw std::ios_base::failure( strprintf("BIP155 TORv3 address with length %u (should be %u)", address_size, ADDR_TORV3_SIZE)); case BIP155Network::I2P: if (address_size == ADDR_I2P_SIZE) { m_net = NET_I2P; return true; } throw std::ios_base::failure( strprintf("BIP155 I2P address with length %u (should be %u)", address_size, ADDR_I2P_SIZE)); case BIP155Network::CJDNS: if (address_size == ADDR_CJDNS_SIZE) { m_net = NET_CJDNS; return true; } throw std::ios_base::failure( strprintf("BIP155 CJDNS address with length %u (should be %u)", address_size, ADDR_CJDNS_SIZE)); } // Don't throw on addresses with unknown network ids (maybe from the future). // Instead silently drop them and have the unserialization code consume // subsequent ones which may be known to us. return false;}/** * Construct an unspecified IPv6 network address (::/128). * * @note This address is considered invalid by CNetAddr::IsValid() */CNetAddr::CNetAddr() {}void CNetAddr::SetIP(const CNetAddr& ipIn){ // Size check. switch (ipIn.m_net) { case NET_IPV4: assert(ipIn.m_addr.size() == ADDR_IPV4_SIZE); break; case NET_IPV6: assert(ipIn.m_addr.size() == ADDR_IPV6_SIZE); break; case NET_ONION: assert(ipIn.m_addr.size() == ADDR_TORV2_SIZE || ipIn.m_addr.size() == ADDR_TORV3_SIZE); break; case NET_I2P: assert(ipIn.m_addr.size() == ADDR_I2P_SIZE); break; case NET_CJDNS: assert(ipIn.m_addr.size() == ADDR_CJDNS_SIZE); break; case NET_INTERNAL: assert(ipIn.m_addr.size() == ADDR_INTERNAL_SIZE); break; case NET_UNROUTABLE: case NET_MAX: assert(false); } // no default case, so the compiler can warn about missing cases m_net = ipIn.m_net; m_addr = ipIn.m_addr;}void CNetAddr::SetLegacyIPv6(Span<const uint8_t> ipv6){ assert(ipv6.size() == ADDR_IPV6_SIZE); size_t skip{0}; if (HasPrefix(ipv6, IPV4_IN_IPV6_PREFIX)) { // IPv4-in-IPv6 m_net = NET_IPV4; skip = sizeof(IPV4_IN_IPV6_PREFIX); } else if (HasPrefix(ipv6, TORV2_IN_IPV6_PREFIX)) { // TORv2-in-IPv6 m_net = NET_ONION; skip = sizeof(TORV2_IN_IPV6_PREFIX); } else if (HasPrefix(ipv6, INTERNAL_IN_IPV6_PREFIX)) { // Internal-in-IPv6 m_net = NET_INTERNAL; skip = sizeof(INTERNAL_IN_IPV6_PREFIX); } else { // IPv6 m_net = NET_IPV6; } m_addr.assign(ipv6.begin() + skip, ipv6.end());}/** * Create an "internal" address that represents a name or FQDN. CAddrMan uses * these fake addresses to keep track of which DNS seeds were used. * @returns Whether or not the operation was successful. * @see NET_INTERNAL, INTERNAL_IN_IPV6_PREFIX, CNetAddr::IsInternal(), CNetAddr::IsRFC4193() */bool CNetAddr::SetInternal(const std::string &name){ if (name.empty()) { return false; } m_net = NET_INTERNAL; unsigned char hash[32] = {}; CSHA256().Write((const unsigned char*)name.data(), name.size()).Finalize(hash); m_addr.assign(hash, hash + ADDR_INTERNAL_SIZE); return true;}namespace torv3 {// https://gitweb.torproject.org/torspec.git/tree/rend-spec-v3.txt#n2135static constexpr size_t CHECKSUM_LEN = 2;static const unsigned char VERSION[] = {3};static constexpr size_t TOTAL_LEN = ADDR_TORV3_SIZE + CHECKSUM_LEN + sizeof(VERSION);static void Checksum(Span<const uint8_t> addr_pubkey, uint8_t (&checksum)[CHECKSUM_LEN]){ // TORv3 CHECKSUM = H(".onion checksum" | PUBKEY | VERSION)[:2] static const unsigned char prefix[] = ".onion checksum"; static constexpr size_t prefix_len = 15; SHA3_256 hasher; hasher.Write(MakeSpan(prefix).first(prefix_len)); hasher.Write(addr_pubkey); hasher.Write(VERSION); uint8_t checksum_full[SHA3_256::OUTPUT_SIZE]; hasher.Finalize(checksum_full); memcpy(checksum, checksum_full, sizeof(checksum));}}; // namespace torv3/** * Parse a TOR address and set this object to it. * * @returns Whether or not the operation was successful. * * @see CNetAddr::IsTor() */bool CNetAddr::SetSpecial(const std::string& str){ static const char* suffix{".onion"}; static constexpr size_t suffix_len{6}; if (!ValidAsCString(str) || str.size() <= suffix_len || str.substr(str.size() - suffix_len) != suffix) { return false; } bool invalid; const auto& input = DecodeBase32(str.substr(0, str.size() - suffix_len).c_str(), &invalid); if (invalid) { return false; } switch (input.size()) { case ADDR_TORV2_SIZE: m_net = NET_ONION; m_addr.assign(input.begin(), input.end()); return true; case torv3::TOTAL_LEN: { Span<const uint8_t> input_pubkey{input.data(), ADDR_TORV3_SIZE}; Span<const uint8_t> input_checksum{input.data() + ADDR_TORV3_SIZE, torv3::CHECKSUM_LEN}; Span<const uint8_t> input_version{input.data() + ADDR_TORV3_SIZE + torv3::CHECKSUM_LEN, sizeof(torv3::VERSION)}; if (input_version != torv3::VERSION) { return false; } uint8_t calculated_checksum[torv3::CHECKSUM_LEN]; torv3::Checksum(input_pubkey, calculated_checksum); if (input_checksum != calculated_checksum) { return false; } m_net = NET_ONION; m_addr.assign(input_pubkey.begin(), input_pubkey.end()); return true; } } return false;}CNetAddr::CNetAddr(const struct in_addr& ipv4Addr){ m_net = NET_IPV4; const uint8_t* ptr = reinterpret_cast<const uint8_t*>(&ipv4Addr); m_addr.assign(ptr, ptr + ADDR_IPV4_SIZE);}CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr, const uint32_t scope){ SetLegacyIPv6(Span<const uint8_t>(reinterpret_cast<const uint8_t*>(&ipv6Addr), sizeof(ipv6Addr))); m_scope_id = scope;}bool CNetAddr::IsBindAny() const{ if (!IsIPv4() && !IsIPv6()) { return false; } return std::all_of(m_addr.begin(), m_addr.end(), [](uint8_t b) { return b == 0; });}bool CNetAddr::IsIPv4() const { return m_net == NET_IPV4; }bool CNetAddr::IsIPv6() const { return m_net == NET_IPV6; }bool CNetAddr::IsRFC1918() const{ return IsIPv4() && ( m_addr[0] == 10 || (m_addr[0] == 192 && m_addr[1] == 168) || (m_addr[0] == 172 && m_addr[1] >= 16 && m_addr[1] <= 31));}bool CNetAddr::IsRFC2544() const{ return IsIPv4() && m_addr[0] == 198 && (m_addr[1] == 18 || m_addr[1] == 19);}bool CNetAddr::IsRFC3927() const{ return IsIPv4() && HasPrefix(m_addr, std::array<uint8_t, 2>{169, 254});}bool CNetAddr::IsRFC6598() const{ return IsIPv4() && m_addr[0] == 100 && m_addr[1] >= 64 && m_addr[1] <= 127;}bool CNetAddr::IsRFC5737() const{ return IsIPv4() && (HasPrefix(m_addr, std::array<uint8_t, 3>{192, 0, 2}) || HasPrefix(m_addr, std::array<uint8_t, 3>{198, 51, 100}) || HasPrefix(m_addr, std::array<uint8_t, 3>{203, 0, 113}));}bool CNetAddr::IsRFC3849() const{ return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 4>{0x20, 0x01, 0x0D, 0xB8});}bool CNetAddr::IsRFC3964() const{ return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 2>{0x20, 0x02});}bool CNetAddr::IsRFC6052() const{ return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 12>{0x00, 0x64, 0xFF, 0x9B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00});}bool CNetAddr::IsRFC4380() const{ return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 4>{0x20, 0x01, 0x00, 0x00});}bool CNetAddr::IsRFC4862() const{ return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 8>{0xFE, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00});}bool CNetAddr::IsRFC4193() const{ return IsIPv6() && (m_addr[0] & 0xFE) == 0xFC;}bool CNetAddr::IsRFC6145() const{ return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 12>{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00});}bool CNetAddr::IsRFC4843() const{ return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 3>{0x20, 0x01, 0x00}) && (m_addr[3] & 0xF0) == 0x10;}bool CNetAddr::IsRFC7343() const{ return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 3>{0x20, 0x01, 0x00}) && (m_addr[3] & 0xF0) == 0x20;}bool CNetAddr::IsHeNet() const{ return IsIPv6() && HasPrefix(m_addr, std::array<uint8_t, 4>{0x20, 0x01, 0x04, 0x70});}/** * Check whether this object represents a TOR address. * @see CNetAddr::SetSpecial(const std::string &) */bool CNetAddr::IsTor() const { return m_net == NET_ONION; }/** * Check whether this object represents an I2P address. */bool CNetAddr::IsI2P() const { return m_net == NET_I2P; }/** * Check whether this object represents a CJDNS address. */bool CNetAddr::IsCJDNS() const { return m_net == NET_CJDNS; }bool CNetAddr::IsLocal() const{ // IPv4 loopback (127.0.0.0/8 or 0.0.0.0/8) if (IsIPv4() && (m_addr[0] == 127 || m_addr[0] == 0)) { return true; } // IPv6 loopback (::1/128) static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}; if (IsIPv6() && memcmp(m_addr.data(), pchLocal, sizeof(pchLocal)) == 0) { return true; } return false;}/** * @returns Whether or not this network address is a valid address that @a could * be used to refer to an actual host. * * @note A valid address may or may not be publicly routable on the global * internet. As in, the set of valid addresses is a superset of the set of * publicly routable addresses. * * @see CNetAddr::IsRoutable() */bool CNetAddr::IsValid() const{ // unspecified IPv6 address (::/128) unsigned char ipNone6[16] = {}; if (IsIPv6() && memcmp(m_addr.data(), ipNone6, sizeof(ipNone6)) == 0) { return false; } // documentation IPv6 address if (IsRFC3849()) return false; if (IsInternal()) return false; if (IsIPv4()) { const uint32_t addr = ReadBE32(m_addr.data()); if (addr == INADDR_ANY || addr == INADDR_NONE) { return false; } } return true;}/** * @returns Whether or not this network address is publicly routable on the * global internet. * * @note A routable address is always valid. As in, the set of routable addresses * is a subset of the set of valid addresses. * * @see CNetAddr::IsValid() */bool CNetAddr::IsRoutable() const{ return IsValid() && !(IsRFC1918() || IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsRFC7343() || IsLocal() || IsInternal());}/** * @returns Whether or not this is a dummy address that represents a name. * * @see CNetAddr::SetInternal(const std::string &) */bool CNetAddr::IsInternal() const{ return m_net == NET_INTERNAL;}bool CNetAddr::IsAddrV1Compatible() const{ switch (m_net) { case NET_IPV4: case NET_IPV6: case NET_INTERNAL: return true; case NET_ONION: return m_addr.size() == ADDR_TORV2_SIZE; case NET_I2P: case NET_CJDNS: return false; case NET_UNROUTABLE: // m_net is never and should not be set to NET_UNROUTABLE case NET_MAX: // m_net is never and should not be set to NET_MAX assert(false); } // no default case, so the compiler can warn about missing cases assert(false);}enum Network CNetAddr::GetNetwork() const{ if (IsInternal()) return NET_INTERNAL; if (!IsRoutable()) return NET_UNROUTABLE; return m_net;}static std::string IPv6ToString(Span<const uint8_t> a){ assert(a.size() == ADDR_IPV6_SIZE); // clang-format off return strprintf("%x:%x:%x:%x:%x:%x:%x:%x", ReadBE16(&a[0]), ReadBE16(&a[2]), ReadBE16(&a[4]), ReadBE16(&a[6]), ReadBE16(&a[8]), ReadBE16(&a[10]), ReadBE16(&a[12]), ReadBE16(&a[14])); // clang-format on}std::string CNetAddr::ToStringIP() const{ switch (m_net) { case NET_IPV4: case NET_IPV6: { CService serv(*this, 0); struct sockaddr_storage sockaddr; socklen_t socklen = sizeof(sockaddr); if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) { char name[1025] = ""; if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), nullptr, 0, NI_NUMERICHOST)) return std::string(name); } if (m_net == NET_IPV4) { return strprintf("%u.%u.%u.%u", m_addr[0], m_addr[1], m_addr[2], m_addr[3]); } return IPv6ToString(m_addr); } case NET_ONION: switch (m_addr.size()) { case ADDR_TORV2_SIZE: return EncodeBase32(m_addr) + ".onion"; case ADDR_TORV3_SIZE: { uint8_t checksum[torv3::CHECKSUM_LEN]; torv3::Checksum(m_addr, checksum); // TORv3 onion_address = base32(PUBKEY | CHECKSUM | VERSION) + ".onion" prevector<torv3::TOTAL_LEN, uint8_t> address{m_addr.begin(), m_addr.end()}; address.insert(address.end(), checksum, checksum + torv3::CHECKSUM_LEN); address.insert(address.end(), torv3::VERSION, torv3::VERSION + sizeof(torv3::VERSION)); return EncodeBase32(address) + ".onion"; } default: assert(false); } case NET_I2P: return EncodeBase32(m_addr, false /* don't pad with = */) + ".b32.i2p"; case NET_CJDNS: return IPv6ToString(m_addr); case NET_INTERNAL: return EncodeBase32(m_addr) + ".internal"; case NET_UNROUTABLE: // m_net is never and should not be set to NET_UNROUTABLE case NET_MAX: // m_net is never and should not be set to NET_MAX assert(false); } // no default case, so the compiler can warn about missing cases assert(false);}std::string CNetAddr::ToString() const{ return ToStringIP();}bool operator==(const CNetAddr& a, const CNetAddr& b){ return a.m_net == b.m_net && a.m_addr == b.m_addr;}bool operator<(const CNetAddr& a, const CNetAddr& b){ return std::tie(a.m_net, a.m_addr) < std::tie(b.m_net, b.m_addr);}/** * Try to get our IPv4 address. * * @param[out] pipv4Addr The in_addr struct to which to copy. * * @returns Whether or not the operation was successful, in particular, whether * or not our address was an IPv4 address. * * @see CNetAddr::IsIPv4() */bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const{ if (!IsIPv4()) return false; assert(sizeof(*pipv4Addr) == m_addr.size()); memcpy(pipv4Addr, m_addr.data(), m_addr.size()); return true;}/** * Try to get our IPv6 address. * * @param[out] pipv6Addr The in6_addr struct to which to copy. * * @returns Whether or not the operation was successful, in particular, whether * or not our address was an IPv6 address. * * @see CNetAddr::IsIPv6() */bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const{ if (!IsIPv6()) { return false; } assert(sizeof(*pipv6Addr) == m_addr.size()); memcpy(pipv6Addr, m_addr.data(), m_addr.size()); return true;}bool CNetAddr::HasLinkedIPv4() const{ return IsRoutable() && (IsIPv4() || IsRFC6145() || IsRFC6052() || IsRFC3964() || IsRFC4380());}uint32_t CNetAddr::GetLinkedIPv4() const{ if (IsIPv4()) { return ReadBE32(m_addr.data()); } else if (IsRFC6052() || IsRFC6145()) { // mapped IPv4, SIIT translated IPv4: the IPv4 address is the last 4 bytes of the address return ReadBE32(MakeSpan(m_addr).last(ADDR_IPV4_SIZE).data()); } else if (IsRFC3964()) { // 6to4 tunneled IPv4: the IPv4 address is in bytes 2-6 return ReadBE32(MakeSpan(m_addr).subspan(2, ADDR_IPV4_SIZE).data()); } else if (IsRFC4380()) { // Teredo tunneled IPv4: the IPv4 address is in the last 4 bytes of the address, but bitflipped return ~ReadBE32(MakeSpan(m_addr).last(ADDR_IPV4_SIZE).data()); } assert(false);}Network CNetAddr::GetNetClass() const{ // Make sure that if we return NET_IPV6, then IsIPv6() is true. The callers expect that. // Check for "internal" first because such addresses are also !IsRoutable() // and we don't want to return NET_UNROUTABLE in that case. if (IsInternal()) { return NET_INTERNAL; } if (!IsRoutable()) { return NET_UNROUTABLE; } if (HasLinkedIPv4()) { return NET_IPV4; } return m_net;}uint32_t CNetAddr::GetMappedAS(const std::vector<bool> &asmap) const { uint32_t net_class = GetNetClass(); if (asmap.size() == 0 || (net_class != NET_IPV4 && net_class != NET_IPV6)) { return 0; // Indicates not found, safe because AS0 is reserved per RFC7607. } std::vector<bool> ip_bits(128); if (HasLinkedIPv4()) { // For lookup, treat as if it was just an IPv4 address (IPV4_IN_IPV6_PREFIX + IPv4 bits) for (int8_t byte_i = 0; byte_i < 12; ++byte_i) { for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) { ip_bits[byte_i * 8 + bit_i] = (IPV4_IN_IPV6_PREFIX[byte_i] >> (7 - bit_i)) & 1; } } uint32_t ipv4 = GetLinkedIPv4(); for (int i = 0; i < 32; ++i) { ip_bits[96 + i] = (ipv4 >> (31 - i)) & 1; } } else { // Use all 128 bits of the IPv6 address otherwise assert(IsIPv6()); for (int8_t byte_i = 0; byte_i < 16; ++byte_i) { uint8_t cur_byte = m_addr[byte_i]; for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) { ip_bits[byte_i * 8 + bit_i] = (cur_byte >> (7 - bit_i)) & 1; } } } uint32_t mapped_as = Interpret(asmap, ip_bits); return mapped_as;}/** * Get the canonical identifier of our network group * * The groups are assigned in a way where it should be costly for an attacker to * obtain addresses with many different group identifiers, even if it is cheap * to obtain addresses with the same identifier. * * @note No two connections will be attempted to addresses with the same network * group. */std::vector<unsigned char> CNetAddr::GetGroup(const std::vector<bool> &asmap) const{ std::vector<unsigned char> vchRet; uint32_t net_class = GetNetClass(); // If non-empty asmap is supplied and the address is IPv4/IPv6, // return ASN to be used for bucketing. uint32_t asn = GetMappedAS(asmap); if (asn != 0) { // Either asmap was empty, or address has non-asmappable net class (e.g. TOR). vchRet.push_back(NET_IPV6); // IPv4 and IPv6 with same ASN should be in the same bucket for (int i = 0; i < 4; i++) { vchRet.push_back((asn >> (8 * i)) & 0xFF); } return vchRet; } vchRet.push_back(net_class); int nBits{0}; if (IsLocal()) { // all local addresses belong to the same group } else if (IsInternal()) { // all internal-usage addresses get their own group nBits = ADDR_INTERNAL_SIZE * 8; } else if (!IsRoutable()) { // all other unroutable addresses belong to the same group } else if (HasLinkedIPv4()) { // IPv4 addresses (and mapped IPv4 addresses) use /16 groups uint32_t ipv4 = GetLinkedIPv4(); vchRet.push_back((ipv4 >> 24) & 0xFF); vchRet.push_back((ipv4 >> 16) & 0xFF); return vchRet; } else if (IsTor() || IsI2P() || IsCJDNS()) { nBits = 4; } else if (IsHeNet()) { // for he.net, use /36 groups nBits = 36; } else { // for the rest of the IPv6 network, use /32 groups nBits = 32; } // Push our address onto vchRet. const size_t num_bytes = nBits / 8; vchRet.insert(vchRet.end(), m_addr.begin(), m_addr.begin() + num_bytes); nBits %= 8; // ...for the last byte, push nBits and for the rest of the byte push 1's if (nBits > 0) { assert(num_bytes < m_addr.size()); vchRet.push_back(m_addr[num_bytes] | ((1 << (8 - nBits)) - 1)); } return vchRet;}std::vector<unsigned char> CNetAddr::GetAddrBytes() const{ if (IsAddrV1Compatible()) { uint8_t serialized[V1_SERIALIZATION_SIZE]; SerializeV1Array(serialized); return {std::begin(serialized), std::end(serialized)}; } return std::vector<unsigned char>(m_addr.begin(), m_addr.end());}uint64_t CNetAddr::GetHash() const{ uint256 hash = Hash(m_addr); uint64_t nRet; memcpy(&nRet, &hash, sizeof(nRet)); return nRet;}// private extensions to enum Network, only returned by GetExtNetwork,// and only used in GetReachabilityFromstatic const int NET_UNKNOWN = NET_MAX + 0;static const int NET_TEREDO = NET_MAX + 1;int static GetExtNetwork(const CNetAddr *addr){ if (addr == nullptr) return NET_UNKNOWN; if (addr->IsRFC4380()) return NET_TEREDO; return addr->GetNetwork();}/** Calculates a metric for how reachable (*this) is from a given partner */int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const{ enum Reachability { REACH_UNREACHABLE, REACH_DEFAULT, REACH_TEREDO, REACH_IPV6_WEAK, REACH_IPV4, REACH_IPV6_STRONG, REACH_PRIVATE }; if (!IsRoutable() || IsInternal()) return REACH_UNREACHABLE; int ourNet = GetExtNetwork(this); int theirNet = GetExtNetwork(paddrPartner); bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145(); switch(theirNet) { case NET_IPV4: switch(ourNet) { default: return REACH_DEFAULT; case NET_IPV4: return REACH_IPV4; } case NET_IPV6: switch(ourNet) { default: return REACH_DEFAULT; case NET_TEREDO: return REACH_TEREDO; case NET_IPV4: return REACH_IPV4; case NET_IPV6: return fTunnel ? REACH_IPV6_WEAK : REACH_IPV6_STRONG; // only prefer giving our IPv6 address if it's not tunnelled } case NET_ONION: switch(ourNet) { default: return REACH_DEFAULT; case NET_IPV4: return REACH_IPV4; // Tor users can connect to IPv4 as well case NET_ONION: return REACH_PRIVATE; } case NET_TEREDO: switch(ourNet) { default: return REACH_DEFAULT; case NET_TEREDO: return REACH_TEREDO; case NET_IPV6: return REACH_IPV6_WEAK; case NET_IPV4: return REACH_IPV4; } case NET_UNKNOWN: case NET_UNROUTABLE: default: switch(ourNet) { default: return REACH_DEFAULT; case NET_TEREDO: return REACH_TEREDO; case NET_IPV6: return REACH_IPV6_WEAK; case NET_IPV4: return REACH_IPV4; case NET_ONION: return REACH_PRIVATE; // either from Tor, or don't care about our address } }}CService::CService() : port(0){}CService::CService(const CNetAddr& cip, uint16_t portIn) : CNetAddr(cip), port(portIn){}CService::CService(const struct in_addr& ipv4Addr, uint16_t portIn) : CNetAddr(ipv4Addr), port(portIn){}CService::CService(const struct in6_addr& ipv6Addr, uint16_t portIn) : CNetAddr(ipv6Addr), port(portIn){}CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port)){ assert(addr.sin_family == AF_INET);}CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr, addr.sin6_scope_id), port(ntohs(addr.sin6_port)){ assert(addr.sin6_family == AF_INET6);}bool CService::SetSockAddr(const struct sockaddr *paddr){ switch (paddr->sa_family) { case AF_INET: *this = CService(*(const struct sockaddr_in*)paddr); return true; case AF_INET6: *this = CService(*(const struct sockaddr_in6*)paddr); return true; default: return false; }}uint16_t CService::GetPort() const{ return port;}bool operator==(const CService& a, const CService& b){ return static_cast<CNetAddr>(a) == static_cast<CNetAddr>(b) && a.port == b.port;}bool operator<(const CService& a, const CService& b){ return static_cast<CNetAddr>(a) < static_cast<CNetAddr>(b) || (static_cast<CNetAddr>(a) == static_cast<CNetAddr>(b) && a.port < b.port);}/** * Obtain the IPv4/6 socket address this represents. * * @param[out] paddr The obtained socket address. * @param[in,out] addrlen The size, in bytes, of the address structure pointed * to by paddr. The value that's pointed to by this * parameter might change after calling this function if * the size of the corresponding address structure * changed. * * @returns Whether or not the operation was successful. */bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const{ if (IsIPv4()) { if (*addrlen < (socklen_t)sizeof(struct sockaddr_in)) return false; *addrlen = sizeof(struct sockaddr_in); struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr; memset(paddrin, 0, *addrlen); if (!GetInAddr(&paddrin->sin_addr)) return false; paddrin->sin_family = AF_INET; paddrin->sin_port = htons(port); return true; } if (IsIPv6()) { if (*addrlen < (socklen_t)sizeof(struct sockaddr_in6)) return false; *addrlen = sizeof(struct sockaddr_in6); struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr; memset(paddrin6, 0, *addrlen); if (!GetIn6Addr(&paddrin6->sin6_addr)) return false; paddrin6->sin6_scope_id = m_scope_id; paddrin6->sin6_family = AF_INET6; paddrin6->sin6_port = htons(port); return true; } return false;}/** * @returns An identifier unique to this service's address and port number. */std::vector<unsigned char> CService::GetKey() const{ auto key = GetAddrBytes(); key.push_back(port / 0x100); // most significant byte of our port key.push_back(port & 0x0FF); // least significant byte of our port return key;}std::string CService::ToStringPort() const{ return strprintf("%u", port);}std::string CService::ToStringIPPort() const{ if (IsIPv4() || IsTor() || IsI2P() || IsInternal()) { return ToStringIP() + ":" + ToStringPort(); } else { return "[" + ToStringIP() + "]:" + ToStringPort(); }}std::string CService::ToString() const{ return ToStringIPPort();}CSubNet::CSubNet(): valid(false){ memset(netmask, 0, sizeof(netmask));}CSubNet::CSubNet(const CNetAddr& addr, uint8_t mask) : CSubNet(){ valid = (addr.IsIPv4() && mask <= ADDR_IPV4_SIZE * 8) || (addr.IsIPv6() && mask <= ADDR_IPV6_SIZE * 8); if (!valid) { return; } assert(mask <= sizeof(netmask) * 8); network = addr; uint8_t n = mask; for (size_t i = 0; i < network.m_addr.size(); ++i) { const uint8_t bits = n < 8 ? n : 8; netmask[i] = (uint8_t)((uint8_t)0xFF << (8 - bits)); // Set first bits. network.m_addr[i] &= netmask[i]; // Normalize network according to netmask. n -= bits; }}/** * @returns The number of 1-bits in the prefix of the specified subnet mask. If * the specified subnet mask is not a valid one, -1. */static inline int NetmaskBits(uint8_t x){ switch(x) { case 0x00: return 0; case 0x80: return 1; case 0xc0: return 2; case 0xe0: return 3; case 0xf0: return 4; case 0xf8: return 5; case 0xfc: return 6; case 0xfe: return 7; case 0xff: return 8; default: return -1; }}CSubNet::CSubNet(const CNetAddr& addr, const CNetAddr& mask) : CSubNet(){ valid = (addr.IsIPv4() || addr.IsIPv6()) && addr.m_net == mask.m_net; if (!valid) { return; } // Check if `mask` contains 1-bits after 0-bits (which is an invalid netmask). bool zeros_found = false; for (auto b : mask.m_addr) { const int num_bits = NetmaskBits(b); if (num_bits == -1 || (zeros_found && num_bits != 0)) { valid = false; return; } if (num_bits < 8) { zeros_found = true; } } assert(mask.m_addr.size() <= sizeof(netmask)); memcpy(netmask, mask.m_addr.data(), mask.m_addr.size()); network = addr; // Normalize network according to netmask for (size_t x = 0; x < network.m_addr.size(); ++x) { network.m_addr[x] &= netmask[x]; }}CSubNet::CSubNet(const CNetAddr& addr) : CSubNet(){ switch (addr.m_net) { case NET_IPV4: case NET_IPV6: valid = true; assert(addr.m_addr.size() <= sizeof(netmask)); memset(netmask, 0xFF, addr.m_addr.size()); break; case NET_ONION: case NET_I2P: case NET_CJDNS: valid = true; break; case NET_INTERNAL: case NET_UNROUTABLE: case NET_MAX: return; } network = addr;}/** * @returns True if this subnet is valid, the specified address is valid, and * the specified address belongs in this subnet. */bool CSubNet::Match(const CNetAddr &addr) const{ if (!valid || !addr.IsValid() || network.m_net != addr.m_net) return false; switch (network.m_net) { case NET_IPV4: case NET_IPV6: break; case NET_ONION: case NET_I2P: case NET_CJDNS: case NET_INTERNAL: return addr == network; case NET_UNROUTABLE: case NET_MAX: return false; } assert(network.m_addr.size() == addr.m_addr.size()); for (size_t x = 0; x < addr.m_addr.size(); ++x) { if ((addr.m_addr[x] & netmask[x]) != network.m_addr[x]) { return false; } } return true;}std::string CSubNet::ToString() const{ std::string suffix; switch (network.m_net) { case NET_IPV4: case NET_IPV6: { assert(network.m_addr.size() <= sizeof(netmask)); uint8_t cidr = 0; for (size_t i = 0; i < network.m_addr.size(); ++i) { if (netmask[i] == 0x00) { break; } cidr += NetmaskBits(netmask[i]); } suffix = strprintf("/%u", cidr); break; } case NET_ONION: case NET_I2P: case NET_CJDNS: case NET_INTERNAL: case NET_UNROUTABLE: case NET_MAX: break; } return network.ToString() + suffix;}bool CSubNet::IsValid() const{ return valid;}bool CSubNet::SanityCheck() const{ switch (network.m_net) { case NET_IPV4: case NET_IPV6: break; case NET_ONION: case NET_I2P: case NET_CJDNS: return true; case NET_INTERNAL: case NET_UNROUTABLE: case NET_MAX: return false; } for (size_t x = 0; x < network.m_addr.size(); ++x) { if (network.m_addr[x] & ~netmask[x]) return false; } return true;}bool operator==(const CSubNet& a, const CSubNet& b){ return a.valid == b.valid && a.network == b.network && !memcmp(a.netmask, b.netmask, 16);}bool operator<(const CSubNet& a, const CSubNet& b){ return (a.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));}bool SanityCheckASMap(const std::vector<bool>& asmap){ return SanityCheckASMap(asmap, 128); // For IP address lookups, the input is 128 bits}