118 lines
3.7 KiB
118 lines
3.7 KiB
#!/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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