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#!/usr/bin/env python3
# Copyright (c) 2014-2021 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
'''
Script to generate list of seed nodes for chainparams.cpp.
This script expects two text files in the directory that is passed as an
argument:
nodes_main.txt
nodes_test.txt
These files must consist of lines in the format
<ip>:<port>
[<ipv6>]:<port>
<onion>.onion:<port>
<i2p>.b32.i2p:<port>
The output will be two data structures with the peers in binary format:
static const uint8_t chainparams_seed_{main,test}[]={
...
}
These should be pasted into `src/chainparamsseeds.h`.
'''
from base64 import b32decode
from enum import Enum
import struct
import sys
import os
import re
class BIP155Network(Enum):
IPV4 = 1
IPV6 = 2
TORV2 = 3 # no longer supported
TORV3 = 4
I2P = 5
CJDNS = 6
def name_to_bip155(addr):
'''Convert address string to BIP155 (networkID, addr) tuple.'''
if addr.endswith('.onion'):
vchAddr = b32decode(addr[0:-6], True)
if len(vchAddr) == 35:
assert vchAddr[34] == 3
return (BIP155Network.TORV3, vchAddr[:32])
elif len(vchAddr) == 10:
return (BIP155Network.TORV2, vchAddr)
else:
raise ValueError('Invalid onion %s' % vchAddr)
elif addr.endswith('.b32.i2p'):
vchAddr = b32decode(addr[0:-8] + '====', True)
if len(vchAddr) == 32:
return (BIP155Network.I2P, vchAddr)
else:
raise ValueError(f'Invalid I2P {vchAddr}')
elif '.' in addr: # IPv4
return (BIP155Network.IPV4, bytes((int(x) for x in addr.split('.'))))
elif ':' in addr: # IPv6 or CJDNS
sub = [[], []] # prefix, suffix
x = 0
addr = addr.split(':')
for i,comp in enumerate(addr):
if comp == '':
if i == 0 or i == (len(addr)-1): # skip empty component at beginning or end
continue
x += 1 # :: skips to suffix
assert x < 2
else: # two bytes per component
val = int(comp, 16)
sub[x].append(val >> 8)
sub[x].append(val & 0xff)
nullbytes = 16 - len(sub[0]) - len(sub[1])
assert (x == 0 and nullbytes == 0) or (x == 1 and nullbytes > 0)
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:
raise ValueError('Could not parse address %s' % addr)
def parse_spec(s):
'''Convert endpoint string to BIP155 (networkID, addr, port) tuple.'''
match = re.match(r'\[([0-9a-fA-F:]+)\](?::([0-9]+))?$', s)
if match: # ipv6
host = match.group(1)
port = match.group(2)
elif s.count(':') > 1: # ipv6, no port
host = s
port = ''
else:
(host,_,port) = s.partition(':')
if not port:
port = 0
else:
port = int(port)
host = name_to_bip155(host)
if host[0] == BIP155Network.TORV2:
return None # TORV2 is no longer supported, so we ignore it
else:
return host + (port, )
def ser_compact_size(l):
r = b""
if l < 253:
r = struct.pack("B", l)
elif l < 0x10000:
r = struct.pack("<BH", 253, l)
elif l < 0x100000000:
r = struct.pack("<BI", 254, l)
else:
r = struct.pack("<BQ", 255, l)
return r
def bip155_serialize(spec):
'''
Serialize (networkID, addr, port) tuple to BIP155 binary format.
'''
r = b""
r += struct.pack('B', spec[0].value)
r += ser_compact_size(len(spec[1]))
r += spec[1]
r += struct.pack('>H', spec[2])
return r
def process_nodes(g, f, structname):
g.write('static const uint8_t %s[] = {\n' % structname)
for line in f:
comment = line.find('#')
if comment != -1:
line = line[0:comment]
line = line.strip()
if not line:
continue
spec = parse_spec(line)
if spec is None: # ignore this entry (e.g. no longer supported addresses like TORV2)
continue
blob = bip155_serialize(spec)
hoststr = ','.join(('0x%02x' % b) for b in blob)
g.write(f' {hoststr},\n')
g.write('};\n')
def main():
if len(sys.argv)<2:
print(('Usage: %s <path_to_nodes_txt>' % sys.argv[0]), file=sys.stderr)
sys.exit(1)
g = sys.stdout
indir = sys.argv[1]
g.write('#ifndef BITCOIN_CHAINPARAMSSEEDS_H\n')
g.write('#define BITCOIN_CHAINPARAMSSEEDS_H\n')
g.write('/**\n')
g.write(' * List of fixed seed nodes for the bitcoin network\n')
g.write(' * AUTOGENERATED by contrib/seeds/generate-seeds.py\n')
g.write(' *\n')
g.write(' * Each line contains a BIP155 serialized (networkID, addr, port) tuple.\n')
g.write(' */\n')
with open(os.path.join(indir,'nodes_main.txt'), 'r', encoding="utf8") as f:
process_nodes(g, f, 'chainparams_seed_main')
g.write('\n')
with open(os.path.join(indir,'nodes_test.txt'), 'r', encoding="utf8") as f:
process_nodes(g, f, 'chainparams_seed_test')
g.write('#endif // BITCOIN_CHAINPARAMSSEEDS_H\n')
if __name__ == '__main__':
main()
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