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contrib: recognize CJDNS seeds as such

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An IPv6 address from fc00::/8 could be either from the CJDNS network or
from a private-unroutable-reserved segment of IPv6. A seed node with
such an address must be from the CJDNS network, otherwise other peers
will not be able to connect to it.
This commit is contained in:
Vasil Dimov 2021-09-09 15:30:44 +02:00
parent f9c28330a0
commit 420695c193
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GPG Key ID: 54DF06F64B55CBBF
1 changed files with 9 additions and 2 deletions
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11
contrib/seeds/generate-seeds.py
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@ -61,7 +61,7 @@ def name_to_bip155(addr):
raise ValueError(f'Invalid I2P {vchAddr}') raise ValueError(f'Invalid I2P {vchAddr}')
elif '.' in addr: # IPv4 elif '.' in addr: # IPv4
return (BIP155Network.IPV4, bytes((int(x) for x in addr.split('.')))) return (BIP155Network.IPV4, bytes((int(x) for x in addr.split('.'))))
elif ':' in addr: # IPv6 elif ':' in addr: # IPv6 or CJDNS
sub = [[], []] # prefix, suffix sub = [[], []] # prefix, suffix
x = 0 x = 0
addr = addr.split(':') addr = addr.split(':')
@ -77,7 +77,14 @@ def name_to_bip155(addr):
sub[x].append(val & 0xff) sub[x].append(val & 0xff)
nullbytes = 16 - len(sub[0]) - len(sub[1]) nullbytes = 16 - len(sub[0]) - len(sub[1])
assert((x == 0 and nullbytes == 0) or (x == 1 and nullbytes > 0)) assert((x == 0 and nullbytes == 0) or (x == 1 and nullbytes > 0))
return (BIP155Network.IPV6, bytes(sub[0] + ([0] * nullbytes) + sub[1])) addr_bytes = bytes(sub[0] + ([0] * nullbytes) + sub[1])
if addr_bytes[0] == 0xfc:
# Assume that seeds with fc00::/8 addresses belong to CJDNS,
# not to the publicly unroutable "Unique Local Unicast" network, see
# RFC4193: https://datatracker.ietf.org/doc/html/rfc4193#section-8
return (BIP155Network.CJDNS, addr_bytes)
else:
return (BIP155Network.IPV6, addr_bytes)
else: else:
raise ValueError('Could not parse address %s' % addr) raise ValueError('Could not parse address %s' % addr)