diff options
Diffstat (limited to 'src/netaddress.h')
| -rw-r--r-- | src/netaddress.h | 211 |
1 files changed, 202 insertions, 9 deletions
diff --git a/src/netaddress.h b/src/netaddress.h index d00f5a6f55..f35b01d202 100644 --- a/src/netaddress.h +++ b/src/netaddress.h @@ -13,13 +13,25 @@ #include <compat.h> #include <prevector.h> #include <serialize.h> +#include <tinyformat.h> +#include <util/strencodings.h> +#include <util/string.h> #include <array> #include <cstdint> +#include <ios> #include <string> #include <vector> /** + * A flag that is ORed into the protocol version to designate that addresses + * should be serialized in (unserialized from) v2 format (BIP155). + * Make sure that this does not collide with any of the values in `version.h` + * or with `SERIALIZE_TRANSACTION_NO_WITNESS`. + */ +static const int ADDRV2_FORMAT = 0x20000000; + +/** * A network type. * @note An address may belong to more than one network, for example `10.0.0.1` * belongs to both `NET_UNROUTABLE` and `NET_IPV4`. @@ -39,9 +51,15 @@ enum Network /// IPv6 NET_IPV6, - /// TORv2 + /// TOR (v2 or v3) NET_ONION, + /// I2P + NET_I2P, + + /// CJDNS + NET_CJDNS, + /// A set of addresses that represent the hash of a string or FQDN. We use /// them in CAddrMan to keep track of which DNS seeds were used. NET_INTERNAL, @@ -82,6 +100,16 @@ static constexpr size_t ADDR_IPV6_SIZE = 16; /// Size of TORv2 address (in bytes). static constexpr size_t ADDR_TORV2_SIZE = 10; +/// Size of TORv3 address (in bytes). This is the length of just the address +/// as used in BIP155, without the checksum and the version byte. +static constexpr size_t ADDR_TORV3_SIZE = 32; + +/// Size of I2P address (in bytes). +static constexpr size_t ADDR_I2P_SIZE = 32; + +/// Size of CJDNS address (in bytes). +static constexpr size_t ADDR_CJDNS_SIZE = 16; + /// Size of "internal" (NET_INTERNAL) address (in bytes). static constexpr size_t ADDR_INTERNAL_SIZE = 10; @@ -102,7 +130,11 @@ class CNetAddr */ Network m_net{NET_IPV6}; - uint32_t scopeId{0}; // for scoped/link-local ipv6 addresses + /** + * Scope id if scoped/link-local IPV6 address. + * See https://tools.ietf.org/html/rfc4007 + */ + uint32_t m_scope_id{0}; public: CNetAddr(); @@ -139,16 +171,24 @@ class CNetAddr bool IsRFC6145() const; // IPv6 IPv4-translated address (::FFFF:0:0:0/96) (actually defined in RFC2765) bool IsHeNet() const; // IPv6 Hurricane Electric - https://he.net (2001:0470::/36) bool IsTor() const; + bool IsI2P() const; + bool IsCJDNS() const; bool IsLocal() const; bool IsRoutable() const; bool IsInternal() const; bool IsValid() const; + + /** + * Check if the current object can be serialized in pre-ADDRv2/BIP155 format. + */ + bool IsAddrV1Compatible() const; + enum Network GetNetwork() const; std::string ToString() const; std::string ToStringIP() const; uint64_t GetHash() const; bool GetInAddr(struct in_addr* pipv4Addr) const; - uint32_t GetNetClass() const; + Network GetNetClass() const; //! For IPv4, mapped IPv4, SIIT translated IPv4, Teredo, 6to4 tunneled addresses, return the relevant IPv4 address as a uint32. uint32_t GetLinkedIPv4() const; @@ -172,12 +212,24 @@ class CNetAddr friend bool operator<(const CNetAddr& a, const CNetAddr& b); /** + * Whether this address should be relayed to other peers even if we can't reach it ourselves. + */ + bool IsRelayable() const + { + return IsIPv4() || IsIPv6() || IsTor(); + } + + /** * Serialize to a stream. */ template <typename Stream> void Serialize(Stream& s) const { - SerializeV1Stream(s); + if (s.GetVersion() & ADDRV2_FORMAT) { + SerializeV2Stream(s); + } else { + SerializeV1Stream(s); + } } /** @@ -186,20 +238,58 @@ class CNetAddr template <typename Stream> void Unserialize(Stream& s) { - UnserializeV1Stream(s); + if (s.GetVersion() & ADDRV2_FORMAT) { + UnserializeV2Stream(s); + } else { + UnserializeV1Stream(s); + } } friend class CSubNet; private: /** + * BIP155 network ids recognized by this software. + */ + enum BIP155Network : uint8_t { + IPV4 = 1, + IPV6 = 2, + TORV2 = 3, + TORV3 = 4, + I2P = 5, + CJDNS = 6, + }; + + /** * Size of CNetAddr when serialized as ADDRv1 (pre-BIP155) (in bytes). */ static constexpr size_t V1_SERIALIZATION_SIZE = ADDR_IPV6_SIZE; /** + * Maximum size of an address as defined in BIP155 (in bytes). + * This is only the size of the address, not the entire CNetAddr object + * when serialized. + */ + static constexpr size_t MAX_ADDRV2_SIZE = 512; + + /** + * Get the BIP155 network id of this address. + * Must not be called for IsInternal() objects. + * @returns BIP155 network id + */ + BIP155Network GetBIP155Network() const; + + /** + * Set `m_net` from the provided BIP155 network id and size after validation. + * @retval true the network was recognized, is valid and `m_net` was set + * @retval false not recognised (from future?) and should be silently ignored + * @throws std::ios_base::failure if the network is one of the BIP155 founding + * networks (id 1..6) with wrong address size. + */ + bool SetNetFromBIP155Network(uint8_t possible_bip155_net, size_t address_size); + + /** * Serialize in pre-ADDRv2/BIP155 format to an array. - * Some addresses (e.g. TORv3) cannot be serialized in pre-BIP155 format. */ void SerializeV1Array(uint8_t (&arr)[V1_SERIALIZATION_SIZE]) const { @@ -217,6 +307,9 @@ class CNetAddr memcpy(arr + prefix_size, m_addr.data(), m_addr.size()); return; case NET_ONION: + if (m_addr.size() == ADDR_TORV3_SIZE) { + break; + } prefix_size = sizeof(TORV2_IN_IPV6_PREFIX); assert(prefix_size + m_addr.size() == sizeof(arr)); memcpy(arr, TORV2_IN_IPV6_PREFIX.data(), prefix_size); @@ -228,17 +321,21 @@ class CNetAddr memcpy(arr, INTERNAL_IN_IPV6_PREFIX.data(), prefix_size); memcpy(arr + prefix_size, m_addr.data(), m_addr.size()); return; + case NET_I2P: + break; + case NET_CJDNS: + break; case NET_UNROUTABLE: case NET_MAX: assert(false); } // no default case, so the compiler can warn about missing cases - assert(false); + // Serialize TORv3, I2P and CJDNS as all-zeros. + memset(arr, 0x0, V1_SERIALIZATION_SIZE); } /** * Serialize in pre-ADDRv2/BIP155 format to a stream. - * Some addresses (e.g. TORv3) cannot be serialized in pre-BIP155 format. */ template <typename Stream> void SerializeV1Stream(Stream& s) const @@ -251,6 +348,25 @@ class CNetAddr } /** + * Serialize as ADDRv2 / BIP155. + */ + template <typename Stream> + void SerializeV2Stream(Stream& s) const + { + if (IsInternal()) { + // Serialize NET_INTERNAL as embedded in IPv6. We need to + // serialize such addresses from addrman. + s << static_cast<uint8_t>(BIP155Network::IPV6); + s << COMPACTSIZE(ADDR_IPV6_SIZE); + SerializeV1Stream(s); + return; + } + + s << static_cast<uint8_t>(GetBIP155Network()); + s << m_addr; + } + + /** * Unserialize from a pre-ADDRv2/BIP155 format from an array. */ void UnserializeV1Array(uint8_t (&arr)[V1_SERIALIZATION_SIZE]) @@ -272,6 +388,65 @@ class CNetAddr UnserializeV1Array(serialized); } + + /** + * Unserialize from a ADDRv2 / BIP155 format. + */ + template <typename Stream> + void UnserializeV2Stream(Stream& s) + { + uint8_t bip155_net; + s >> bip155_net; + + size_t address_size; + s >> COMPACTSIZE(address_size); + + if (address_size > MAX_ADDRV2_SIZE) { + throw std::ios_base::failure(strprintf( + "Address too long: %u > %u", address_size, MAX_ADDRV2_SIZE)); + } + + m_scope_id = 0; + + if (SetNetFromBIP155Network(bip155_net, address_size)) { + m_addr.resize(address_size); + s >> MakeSpan(m_addr); + + if (m_net != NET_IPV6) { + return; + } + + // Do some special checks on IPv6 addresses. + + // Recognize NET_INTERNAL embedded in IPv6, such addresses are not + // gossiped but could be coming from addrman, when unserializing from + // disk. + if (HasPrefix(m_addr, INTERNAL_IN_IPV6_PREFIX)) { + m_net = NET_INTERNAL; + memmove(m_addr.data(), m_addr.data() + INTERNAL_IN_IPV6_PREFIX.size(), + ADDR_INTERNAL_SIZE); + m_addr.resize(ADDR_INTERNAL_SIZE); + return; + } + + if (!HasPrefix(m_addr, IPV4_IN_IPV6_PREFIX) && + !HasPrefix(m_addr, TORV2_IN_IPV6_PREFIX)) { + return; + } + + // IPv4 and TORv2 are not supposed to be embedded in IPv6 (like in V1 + // encoding). Unserialize as !IsValid(), thus ignoring them. + } else { + // If we receive an unknown BIP155 network id (from the future?) then + // ignore the address - unserialize as !IsValid(). + s.ignore(address_size); + } + + // Mimic a default-constructed CNetAddr object which is !IsValid() and thus + // will not be gossiped, but continue reading next addresses from the stream. + m_net = NET_IPV6; + m_addr.assign(ADDR_IPV6_SIZE, 0x0); + } }; class CSubNet @@ -284,6 +459,8 @@ class CSubNet /// Is this value valid? (only used to signal parse errors) bool valid; + bool SanityCheck() const; + public: CSubNet(); CSubNet(const CNetAddr& addr, uint8_t mask); @@ -301,7 +478,23 @@ class CSubNet friend bool operator!=(const CSubNet& a, const CSubNet& b) { return !(a == b); } friend bool operator<(const CSubNet& a, const CSubNet& b); - SERIALIZE_METHODS(CSubNet, obj) { READWRITE(obj.network, obj.netmask, obj.valid); } + SERIALIZE_METHODS(CSubNet, obj) + { + READWRITE(obj.network); + if (obj.network.IsIPv4()) { + // Before commit 102867c587f5f7954232fb8ed8e85cda78bb4d32, CSubNet used the last 4 bytes of netmask + // to store the relevant bytes for an IPv4 mask. For compatiblity reasons, keep doing so in + // serialized form. + unsigned char dummy[12] = {0}; + READWRITE(dummy); + READWRITE(MakeSpan(obj.netmask).first(4)); + } else { + READWRITE(obj.netmask); + } + READWRITE(obj.valid); + // Mark invalid if the result doesn't pass sanity checking. + SER_READ(obj, if (obj.valid) obj.valid = obj.SanityCheck()); + } }; /** A combination of a network address (CNetAddr) and a (TCP) port */ |