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#!/usr/bin/env python3
# Copyright (c) 2014-2017 Wladimir J. van der Laan
# 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>
<ip>:<port>
[<ipv6>]
[<ipv6>]:<port>
<onion>.onion
0xDDBBCCAA (IPv4 little-endian old pnSeeds format)
The output will be two data structures with the peers in binary format:
static SeedSpec6 pnSeed6_main[]={
...
}
static SeedSpec6 pnSeed6_test[]={
...
}
These should be pasted into `src/chainparamsseeds.h`.
'''
from base64 import b32decode
from binascii import a2b_hex
import sys
import os
import re
# ipv4 in ipv6 prefix
pchIPv4 = bytearray([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff])
# tor-specific ipv6 prefix
pchOnionCat = bytearray([0xFD,0x87,0xD8,0x7E,0xEB,0x43])
def name_to_ipv6(addr):
if len(addr)>6 and addr.endswith('.onion'):
vchAddr = b32decode(addr[0:-6], True)
if len(vchAddr) != 16-len(pchOnionCat):
raise ValueError('Invalid onion %s' % vchAddr)
return pchOnionCat + vchAddr
elif '.' in addr: # IPv4
return pchIPv4 + bytearray((int(x) for x in addr.split('.')))
elif ':' in addr: # IPv6
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))
return bytearray(sub[0] + ([0] * nullbytes) + sub[1])
elif addr.startswith('0x'): # IPv4-in-little-endian
return pchIPv4 + bytearray(reversed(a2b_hex(addr[2:])))
else:
raise ValueError('Could not parse address %s' % addr)
def parse_spec(s, defaultport):
match = re.match('\[([0-9a-fA-F:]+)\](?::([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 = defaultport
else:
port = int(port)
host = name_to_ipv6(host)
return (host,port)
def process_nodes(g, f, structname, defaultport):
g.write('static SeedSpec6 %s[] = {\n' % structname)
first = True
for line in f:
comment = line.find('#')
if comment != -1:
line = line[0:comment]
line = line.strip()
if not line:
continue
if not first:
g.write(',\n')
first = False
(host,port) = parse_spec(line, defaultport)
hoststr = ','.join(('0x%02x' % b) for b in host)
g.write(' {{%s}, %i}' % (hoststr, port))
g.write('\n};\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 16-byte IPv6 address and a port.\n')
g.write(' * IPv4 as well as onion addresses are wrapped inside an IPv6 address accordingly.\n')
g.write(' */\n')
with open(os.path.join(indir,'nodes_main.txt'),'r') as f:
process_nodes(g, f, 'pnSeed6_main', 8333)
g.write('\n')
with open(os.path.join(indir,'nodes_test.txt'),'r') as f:
process_nodes(g, f, 'pnSeed6_test', 18333)
g.write('#endif // BITCOIN_CHAINPARAMSSEEDS_H\n')
if __name__ == '__main__':
main()
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