119 lines
3.7 KiB
Python
Executable file
119 lines
3.7 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# Generate seeds.txt from Pieter's DNS seeder
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#
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NSEEDS=512
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MAX_SEEDS_PER_ASN=2
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MIN_BLOCKS = 337600
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# These are hosts that have been observed to be behaving strangely (e.g.
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# aggressively connecting to every node).
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SUSPICIOUS_HOSTS = set([
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"130.211.129.106", "178.63.107.226",
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"83.81.130.26", "88.198.17.7", "148.251.238.178", "176.9.46.6",
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"54.173.72.127", "54.174.10.182", "54.183.64.54", "54.194.231.211",
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"54.66.214.167", "54.66.220.137", "54.67.33.14", "54.77.251.214",
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"54.94.195.96", "54.94.200.247"
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])
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import re
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import sys
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import dns.resolver
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PATTERN_IPV4 = re.compile(r"^((\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})):8333$")
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PATTERN_AGENT = re.compile(r"^(\/Satoshi:0.8.6\/|\/Satoshi:0.9.(2|3)\/|\/Satoshi:0.10.\d{1,2}\/)$")
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def parseline(line):
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sline = line.split()
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if len(sline) < 11:
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return None
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# Match only IPv4
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m = PATTERN_IPV4.match(sline[0])
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if m is None:
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return None
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# Do IPv4 sanity check
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ip = 0
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for i in range(0,4):
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if int(m.group(i+2)) < 0 or int(m.group(i+2)) > 255:
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return None
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ip = ip + (int(m.group(i+2)) << (8*(3-i)))
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if ip == 0:
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return None
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# Skip bad results.
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if sline[1] == 0:
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return None
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# Extract uptime %.
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uptime30 = float(sline[7][:-1])
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# Extract Unix timestamp of last success.
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lastsuccess = int(sline[2])
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# Extract protocol version.
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version = int(sline[10])
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# Extract user agent.
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agent = sline[11][1:-1]
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# Extract service flags.
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service = int(sline[9], 16)
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# Extract blocks.
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blocks = int(sline[8])
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# Construct result.
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return {
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'ip': m.group(1),
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'ipnum': ip,
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'uptime': uptime30,
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'lastsuccess': lastsuccess,
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'version': version,
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'agent': agent,
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'service': service,
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'blocks': blocks,
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}
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# Based on Greg Maxwell's seed_filter.py
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def filterbyasn(ips, max_per_asn, max_total):
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result = []
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asn_count = {}
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for ip in ips:
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if len(result) == max_total:
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break
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try:
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asn = int([x.to_text() for x in dns.resolver.query('.'.join(reversed(ip['ip'].split('.'))) + '.origin.asn.cymru.com', 'TXT').response.answer][0].split('\"')[1].split(' ')[0])
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if asn not in asn_count:
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asn_count[asn] = 0
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if asn_count[asn] == max_per_asn:
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continue
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asn_count[asn] += 1
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result.append(ip)
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except:
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sys.stderr.write('ERR: Could not resolve ASN for "' + ip['ip'] + '"\n')
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return result
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def main():
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lines = sys.stdin.readlines()
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ips = [parseline(line) for line in lines]
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# Skip entries with valid IPv4 address.
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ips = [ip for ip in ips if ip is not None]
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# Skip entries from suspicious hosts.
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ips = [ip for ip in ips if ip['ip'] not in SUSPICIOUS_HOSTS]
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# Enforce minimal number of blocks.
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ips = [ip for ip in ips if ip['blocks'] >= MIN_BLOCKS]
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# Require service bit 1.
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ips = [ip for ip in ips if (ip['service'] & 1) == 1]
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# Require at least 50% 30-day uptime.
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ips = [ip for ip in ips if ip['uptime'] > 50]
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# Require a known and recent user agent.
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ips = [ip for ip in ips if PATTERN_AGENT.match(ip['agent'])]
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# Sort by availability (and use last success as tie breaker)
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ips.sort(key=lambda x: (x['uptime'], x['lastsuccess'], x['ip']), reverse=True)
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# Look up ASNs and limit results, both per ASN and globally.
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ips = filterbyasn(ips, MAX_SEEDS_PER_ASN, NSEEDS)
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# Sort the results by IP address (for deterministic output).
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ips.sort(key=lambda x: (x['ipnum']))
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for ip in ips:
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print ip['ip']
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if __name__ == '__main__':
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main()
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