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net: take the first 4 random bits from CJDNS addresses in GetGroup()

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CJDNS addresses start with constant 8 bits, so in order to account for
the first 4 random ones, we must take the first 12. Otherwise the entire
CJDNS network will belong to one group.
This commit is contained in:
Vasil Dimov 2021-09-09 15:46:12 +02:00
parent 29ff79c0a2
commit f9c28330a0
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GPG key ID: 54DF06F64B55CBBF
1 changed files with 7 additions and 1 deletions
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8
src/netaddress.cpp
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@ -794,8 +794,14 @@ std::vector<unsigned char> CNetAddr::GetGroup(const std::vector<bool> &asmap) co
vchRet.push_back((ipv4 >> 24) & 0xFF);
vchRet.push_back((ipv4 >> 16) & 0xFF);
return vchRet;
} else if (IsTor() || IsI2P() || IsCJDNS()) {
} else if (IsTor() || IsI2P()) {
nBits = 4;
} else if (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.
nBits = 12;
} else if (IsHeNet()) {
// for he.net, use /36 groups
nBits = 36;