1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
#!/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.(0|1|99)|"
r"0.21.99"
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.resolve('.'.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()
|
