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net: put CJDNS prefix byte in a constant

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Vasil Dimov 2023-10-05 15:09:45 +02:00
parent 78fd3c2672
commit 64d6f77907
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GPG key ID: 54DF06F64B55CBBF
2 changed files with 7 additions and 3 deletions
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6
src/netaddress.h
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@ -81,6 +81,10 @@ static const std::array<uint8_t, 6> INTERNAL_IN_IPV6_PREFIX{
0xFD, 0x6B, 0x88, 0xC0, 0x87, 0x24 // 0xFD + sha256("bitcoin")[0:5].
};
/// All CJDNS addresses start with 0xFC. See
/// https://github.com/cjdelisle/cjdns/blob/master/doc/Whitepaper.md#pulling-it-all-together
static constexpr uint8_t CJDNS_PREFIX{0xFC};
/// Size of IPv4 address (in bytes).
static constexpr size_t ADDR_IPV4_SIZE = 4;
@ -174,7 +178,7 @@ public:
[[nodiscard]] bool IsTor() const { return m_net == NET_ONION; }
[[nodiscard]] bool IsI2P() const { return m_net == NET_I2P; }
[[nodiscard]] bool IsCJDNS() const { return m_net == NET_CJDNS; }
[[nodiscard]] bool HasCJDNSPrefix() const { return m_addr[0] == 0xfc; }
[[nodiscard]] bool HasCJDNSPrefix() const { return m_addr[0] == CJDNS_PREFIX; }
bool IsLocal() const;
bool IsRoutable() const;
bool IsInternal() const;

4
src/netgroup.cpp
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@ -52,8 +52,8 @@ std::vector<unsigned char> NetGroupManager::GetGroup(const CNetAddr& address) co
} else if (address.IsCJDNS()) {
// Treat in the same way as Tor and I2P because the address in all of
// them is "random" bytes (derived from a public key). However in CJDNS
// the first byte is a constant 0xfc, so the random bytes come after it.
// Thus skip the constant 8 bits at the start.
// the first byte is a constant (see CJDNS_PREFIX), so the random bytes
// come after it. Thus skip the constant 8 bits at the start.
nBits = 12;
} else if (address.IsHeNet()) {
// for he.net, use /36 groups