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#!/usr/bin/env python3
# Copyright (c) 2013-2022 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
#
# Generate seeds.txt from Pieter's DNS seeder
#
import argparse
import collections
import ipaddress
import re
import sys
from typing import List, Dict, Union
from asmap import ASMap, net_to_prefix
NSEEDS=512
MAX_SEEDS_PER_ASN = {
'ipv4': 2,
'ipv6': 10,
}
MIN_BLOCKS = 730000
PATTERN_IPV4 = re.compile(r"^((\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})):(\d+)$")
PATTERN_IPV6 = re.compile(r"^\[([0-9a-z:]+)\]:(\d+)$")
PATTERN_ONION = re.compile(r"^([a-z2-7]{56}\.onion):(\d+)$")
PATTERN_AGENT = re.compile(
r"^/Satoshi:("
r"0.14.(0|1|2|3|99)|"
r"0.15.(0|1|2|99)|"
r"0.16.(0|1|2|3|99)|"
r"0.17.(0|0.1|1|2|99)|"
r"0.18.(0|1|99)|"
r"0.19.(0|1|2|99)|"
r"0.20.(0|1|2|99)|"
r"0.21.(0|1|2|99)|"
r"22.(0|99)|"
r"23.(0|99)|"
r"24.99"
r")")
def parseline(line: str) -> Union[dict, None]:
""" Parses a line from `seeds_main.txt` into a dictionary of details for that line.
or `None`, if the line could not be parsed.
"""
sline = line.split()
if len(sline) < 11:
# line too short to be valid, skip it.
return None
m = PATTERN_IPV4.match(sline[0])
sortkey = None
ip = None
if m is None:
m = PATTERN_IPV6.match(sline[0])
if m is None:
m = PATTERN_ONION.match(sline[0])
if m is None:
return None
else:
net = 'onion'
ipstr = sortkey = m.group(1)
port = int(m.group(2))
else:
net = 'ipv6'
if m.group(1) in ['::']: # Not interested in localhost
return None
ipstr = m.group(1)
sortkey = ipstr # XXX parse IPv6 into number, could use name_to_ipv6 from generate-seeds
port = int(m.group(2))
else:
# Do IPv4 sanity check
ip = 0
for i in range(0,4):
if int(m.group(i+2)) < 0 or int(m.group(i+2)) > 255:
return None
ip = ip + (int(m.group(i+2)) << (8*(3-i)))
if ip == 0:
return None
net = 'ipv4'
sortkey = ip
ipstr = m.group(1)
port = int(m.group(6))
# Skip bad results.
if sline[1] == 0:
return None
# Extract uptime %.
uptime30 = float(sline[7][:-1])
# Extract Unix timestamp of last success.
lastsuccess = int(sline[2])
# Extract protocol version.
version = int(sline[10])
# Extract user agent.
agent = sline[11][1:-1]
# Extract service flags.
service = int(sline[9], 16)
# Extract blocks.
blocks = int(sline[8])
# Construct result.
return {
'net': net,
'ip': ipstr,
'port': port,
'ipnum': ip,
'uptime': uptime30,
'lastsuccess': lastsuccess,
'version': version,
'agent': agent,
'service': service,
'blocks': blocks,
'sortkey': sortkey,
}
def dedup(ips: List[Dict]) -> List[Dict]:
""" Remove duplicates from `ips` where multiple ips share address and port. """
d = {}
for ip in ips:
d[ip['ip'],ip['port']] = ip
return list(d.values())
def filtermultiport(ips: List[Dict]) -> List[Dict]:
""" Filter out hosts with more nodes per IP"""
hist = collections.defaultdict(list)
for ip in ips:
hist[ip['sortkey']].append(ip)
return [value[0] for (key,value) in list(hist.items()) if len(value)==1]
# Based on Greg Maxwell's seed_filter.py
def filterbyasn(asmap: ASMap, ips: List[Dict], max_per_asn: Dict, max_per_net: int) -> List[Dict]:
""" Prunes `ips` by
(a) trimming ips to have at most `max_per_net` ips from each net (e.g. ipv4, ipv6); and
(b) trimming ips to have at most `max_per_asn` ips from each asn in each net.
"""
# Sift out ips by type
ips_ipv46 = [ip for ip in ips if ip['net'] in ['ipv4', 'ipv6']]
ips_onion = [ip for ip in ips if ip['net'] == 'onion']
# Filter IPv46 by ASN, and limit to max_per_net per network
result = []
net_count: Dict[str, int] = collections.defaultdict(int)
asn_count: Dict[int, int] = collections.defaultdict(int)
for i, ip in enumerate(ips_ipv46):
if net_count[ip['net']] == max_per_net:
# do not add this ip as we already too many
# ips from this network
continue
asn = asmap.lookup(net_to_prefix(ipaddress.ip_network(ip['ip'])))
if not asn or asn_count[ip['net'], asn] == max_per_asn[ip['net']]:
# do not add this ip as we already have too many
# ips from this ASN on this network
continue
asn_count[ip['net'], asn] += 1
net_count[ip['net']] += 1
ip['asn'] = asn
result.append(ip)
# Add back Onions (up to max_per_net)
result.extend(ips_onion[0:max_per_net])
return result
def ip_stats(ips: List[Dict]) -> str:
""" Format and return pretty string from `ips`. """
hist: Dict[str, int] = collections.defaultdict(int)
for ip in ips:
if ip is not None:
hist[ip['net']] += 1
return f"{hist['ipv4']:6d} {hist['ipv6']:6d} {hist['onion']:6d}"
def parse_args():
argparser = argparse.ArgumentParser(description='Generate a list of bitcoin node seed ip addresses.')
argparser.add_argument("-a","--asmap", help='the location of the asmap asn database file (required)', required=True)
return argparser.parse_args()
def main():
args = parse_args()
print(f'Loading asmap database "{args.asmap}"…', end='', file=sys.stderr, flush=True)
with open(args.asmap, 'rb') as f:
asmap = ASMap.from_binary(f.read())
print('Done.', file=sys.stderr)
print('Loading and parsing DNS seeds…', end='', file=sys.stderr, flush=True)
lines = sys.stdin.readlines()
ips = [parseline(line) for line in lines]
print('Done.', file=sys.stderr)
print('\x1b[7m IPv4 IPv6 Onion Pass \x1b[0m', file=sys.stderr)
print(f'{ip_stats(ips):s} Initial', file=sys.stderr)
# Skip entries with invalid address.
ips = [ip for ip in ips if ip is not None]
print(f'{ip_stats(ips):s} Skip entries with invalid address', file=sys.stderr)
# Skip duplicates (in case multiple seeds files were concatenated)
ips = dedup(ips)
print(f'{ip_stats(ips):s} After removing duplicates', file=sys.stderr)
# Enforce minimal number of blocks.
ips = [ip for ip in ips if ip['blocks'] >= MIN_BLOCKS]
print(f'{ip_stats(ips):s} Enforce minimal number of blocks', file=sys.stderr)
# Require service bit 1.
ips = [ip for ip in ips if (ip['service'] & 1) == 1]
print(f'{ip_stats(ips):s} Require service bit 1', file=sys.stderr)
# Require at least 50% 30-day uptime for clearnet, 10% for onion.
req_uptime = {
'ipv4': 50,
'ipv6': 50,
'onion': 10,
}
ips = [ip for ip in ips if ip['uptime'] > req_uptime[ip['net']]]
print(f'{ip_stats(ips):s} Require minimum uptime', file=sys.stderr)
# Require a known and recent user agent.
ips = [ip for ip in ips if PATTERN_AGENT.match(ip['agent'])]
print(f'{ip_stats(ips):s} Require a known and recent user agent', file=sys.stderr)
# Sort by availability (and use last success as tie breaker)
ips.sort(key=lambda x: (x['uptime'], x['lastsuccess'], x['ip']), reverse=True)
# Filter out hosts with multiple bitcoin ports, these are likely abusive
ips = filtermultiport(ips)
print(f'{ip_stats(ips):s} Filter out hosts with multiple bitcoin ports', file=sys.stderr)
# Look up ASNs and limit results, both per ASN and globally.
ips = filterbyasn(asmap, ips, MAX_SEEDS_PER_ASN, NSEEDS)
print(f'{ip_stats(ips):s} Look up ASNs and limit results per ASN and per net', file=sys.stderr)
# Sort the results by IP address (for deterministic output).
ips.sort(key=lambda x: (x['net'], x['sortkey']))
for ip in ips:
if ip['net'] == 'ipv6':
print(f"[{ip['ip']}]:{ip['port']}", end="")
else:
print(f"{ip['ip']}:{ip['port']}", end="")
if 'asn' in ip:
print(f" # AS{ip['asn']}", end="")
print()
if __name__ == '__main__':
main()
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