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#!/usr/bin/env python3
# Copyright (c) 2013-2020 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 re
import sys
import dns.resolver
import collections
NSEEDS=512
MAX_SEEDS_PER_ASN=2
MIN_BLOCKS = 337600
# These are hosts that have been observed to be behaving strangely (e.g.
# aggressively connecting to every node).
with open("suspicious_hosts.txt", mode="r", encoding="utf-8") as f:
SUSPICIOUS_HOSTS = {s.strip() for s in f if s.strip()}
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+)$")
PATTERN_ONION = re.compile(r"^([abcdefghijklmnopqrstuvwxyz234567]{16}\.onion):(\d+)$")
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|99)|"
r"0.20.99"
r")")
def parseline(line):
sline = line.split()
if len(sline) < 11:
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):
'''deduplicate by address,port'''
d = {}
for ip in ips:
d[ip['ip'],ip['port']] = ip
return list(d.values())
def filtermultiport(ips):
'''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]
def lookup_asn(net, ip):
'''
Look up the asn for an IP (4 or 6) address by querying cymru.com, or None
if it could not be found.
'''
try:
if net == 'ipv4':
ipaddr = ip
prefix = '.origin'
else: # http://www.team-cymru.com/IP-ASN-mapping.html
res = str() # 2001:4860:b002:23::68
for nb in ip.split(':')[:4]: # pick the first 4 nibbles
for c in nb.zfill(4): # right padded with '0'
res += c + '.' # 2001 4860 b002 0023
ipaddr = res.rstrip('.') # 2.0.0.1.4.8.6.0.b.0.0.2.0.0.2.3
prefix = '.origin6'
asn = int([x.to_text() for x in dns.resolver.query('.'.join(
reversed(ipaddr.split('.'))) + prefix + '.asn.cymru.com',
'TXT').response.answer][0].split('\"')[1].split(' ')[0])
return asn
except Exception:
sys.stderr.write('ERR: Could not resolve ASN for "' + ip + '"\n')
return None
# Based on Greg Maxwell's seed_filter.py
def filterbyasn(ips, max_per_asn, max_per_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 = collections.defaultdict(int)
asn_count = collections.defaultdict(int)
for ip in ips_ipv46:
if net_count[ip['net']] == max_per_net:
continue
asn = lookup_asn(ip['net'], ip['ip'])
if asn is None or asn_count[asn] == max_per_asn:
continue
asn_count[asn] += 1
net_count[ip['net']] += 1
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):
hist = collections.defaultdict(int)
for ip in ips:
if ip is not None:
hist[ip['net']] += 1
return '%6d %6d %6d' % (hist['ipv4'], hist['ipv6'], hist['onion'])
def main():
lines = sys.stdin.readlines()
ips = [parseline(line) for line in lines]
print('\x1b[7m IPv4 IPv6 Onion Pass \x1b[0m', file=sys.stderr)
print('%s Initial' % (ip_stats(ips)), file=sys.stderr)
# Skip entries with invalid address.
ips = [ip for ip in ips if ip is not None]
print('%s Skip entries with invalid address' % (ip_stats(ips)), file=sys.stderr)
# Skip duplicates (in case multiple seeds files were concatenated)
ips = dedup(ips)
print('%s After removing duplicates' % (ip_stats(ips)), file=sys.stderr)
# Skip entries from suspicious hosts.
ips = [ip for ip in ips if ip['ip'] not in SUSPICIOUS_HOSTS]
print('%s Skip entries from suspicious hosts' % (ip_stats(ips)), file=sys.stderr)
# Enforce minimal number of blocks.
ips = [ip for ip in ips if ip['blocks'] >= MIN_BLOCKS]
print('%s Enforce minimal number of blocks' % (ip_stats(ips)), file=sys.stderr)
# Require service bit 1.
ips = [ip for ip in ips if (ip['service'] & 1) == 1]
print('%s Require service bit 1' % (ip_stats(ips)), 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('%s Require minimum uptime' % (ip_stats(ips)), file=sys.stderr)
# Require a known and recent user agent.
ips = [ip for ip in ips if PATTERN_AGENT.match(ip['agent'])]
print('%s Require a known and recent user agent' % (ip_stats(ips)), 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('%s Filter out hosts with multiple bitcoin ports' % (ip_stats(ips)), file=sys.stderr)
# Look up ASNs and limit results, both per ASN and globally.
ips = filterbyasn(ips, MAX_SEEDS_PER_ASN, NSEEDS)
print('%s Look up ASNs and limit results per ASN and per net' % (ip_stats(ips)), 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('[%s]:%i' % (ip['ip'], ip['port']))
else:
print('%s:%i' % (ip['ip'], ip['port']))
if __name__ == '__main__':
main()
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