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140 lines
4.3 KiB
140 lines
4.3 KiB
#!/usr/bin/env python3
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# Copyright (c) 2014-2017 Wladimir J. van der Laan
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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'''
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Script to generate list of seed nodes for chainparams.cpp.
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This script expects two text files in the directory that is passed as an
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argument:
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nodes_main.txt
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nodes_test.txt
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These files must consist of lines in the format
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<ip>
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<ip>:<port>
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[<ipv6>]
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[<ipv6>]:<port>
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<onion>.onion
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0xDDBBCCAA (IPv4 little-endian old pnSeeds format)
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The output will be two data structures with the peers in binary format:
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static SeedSpec6 pnSeed6_main[]={
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...
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}
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static SeedSpec6 pnSeed6_test[]={
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...
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}
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These should be pasted into `src/chainparamsseeds.h`.
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'''
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from base64 import b32decode
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from binascii import a2b_hex
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import sys
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import os
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import re
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# ipv4 in ipv6 prefix
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pchIPv4 = bytearray([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff])
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# tor-specific ipv6 prefix
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pchOnionCat = bytearray([0xFD,0x87,0xD8,0x7E,0xEB,0x43])
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def name_to_ipv6(addr):
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if len(addr)>6 and addr.endswith('.onion'):
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vchAddr = b32decode(addr[0:-6], True)
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if len(vchAddr) != 16-len(pchOnionCat):
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raise ValueError('Invalid onion %s' % vchAddr)
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return pchOnionCat + vchAddr
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elif '.' in addr: # IPv4
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return pchIPv4 + bytearray((int(x) for x in addr.split('.')))
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elif ':' in addr: # IPv6
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sub = [[], []] # prefix, suffix
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x = 0
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addr = addr.split(':')
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for i,comp in enumerate(addr):
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if comp == '':
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if i == 0 or i == (len(addr)-1): # skip empty component at beginning or end
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continue
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x += 1 # :: skips to suffix
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assert(x < 2)
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else: # two bytes per component
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val = int(comp, 16)
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sub[x].append(val >> 8)
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sub[x].append(val & 0xff)
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nullbytes = 16 - len(sub[0]) - len(sub[1])
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assert((x == 0 and nullbytes == 0) or (x == 1 and nullbytes > 0))
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return bytearray(sub[0] + ([0] * nullbytes) + sub[1])
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elif addr.startswith('0x'): # IPv4-in-little-endian
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return pchIPv4 + bytearray(reversed(a2b_hex(addr[2:])))
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else:
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raise ValueError('Could not parse address %s' % addr)
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def parse_spec(s, defaultport):
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match = re.match('\[([0-9a-fA-F:]+)\](?::([0-9]+))?$', s)
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if match: # ipv6
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host = match.group(1)
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port = match.group(2)
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elif s.count(':') > 1: # ipv6, no port
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host = s
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port = ''
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else:
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(host,_,port) = s.partition(':')
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if not port:
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port = defaultport
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else:
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port = int(port)
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host = name_to_ipv6(host)
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return (host,port)
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def process_nodes(g, f, structname, defaultport):
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g.write('static SeedSpec6 %s[] = {\n' % structname)
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first = True
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for line in f:
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comment = line.find('#')
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if comment != -1:
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line = line[0:comment]
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line = line.strip()
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if not line:
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continue
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if not first:
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g.write(',\n')
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first = False
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(host,port) = parse_spec(line, defaultport)
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hoststr = ','.join(('0x%02x' % b) for b in host)
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g.write(' {{%s}, %i}' % (hoststr, port))
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g.write('\n};\n')
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def main():
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if len(sys.argv)<2:
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print(('Usage: %s <path_to_nodes_txt>' % sys.argv[0]), file=sys.stderr)
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sys.exit(1)
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g = sys.stdout
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indir = sys.argv[1]
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g.write('#ifndef BITCOIN_CHAINPARAMSSEEDS_H\n')
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g.write('#define BITCOIN_CHAINPARAMSSEEDS_H\n')
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g.write('/**\n')
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g.write(' * List of fixed seed nodes for the litecoin network\n')
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g.write(' * AUTOGENERATED by contrib/seeds/generate-seeds.py\n')
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g.write(' *\n')
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g.write(' * Each line contains a 16-byte IPv6 address and a port.\n')
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g.write(' * IPv4 as well as onion addresses are wrapped inside an IPv6 address accordingly.\n')
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g.write(' */\n')
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with open(os.path.join(indir,'nodes_main.txt'), 'r', encoding="utf8") as f:
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process_nodes(g, f, 'pnSeed6_main', 9333)
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g.write('\n')
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with open(os.path.join(indir,'nodes_test.txt'), 'r', encoding="utf8") as f:
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process_nodes(g, f, 'pnSeed6_test', 19335)
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g.write('#endif // BITCOIN_CHAINPARAMSSEEDS_H\n')
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if __name__ == '__main__':
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main()
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