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contrib: makeseeds: Factor out ASN lookup

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This commit is contained in:
Wladimir J. van der Laan 2019-10-01 11:00:53 +02:00
parent 301c2b1ab5
commit 3314d87966
1 changed files with 31 additions and 24 deletions
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55
contrib/seeds/makeseeds.py
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@ -121,6 +121,31 @@ def filtermultiport(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 cymry.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_total):
# Sift out ips by type
@ -129,33 +154,15 @@ def filterbyasn(ips, max_per_asn, max_total):
# Filter IPv46 by ASN
result = []
asn_count = {}
asn_count = collections.defaultdict(int)
for ip in ips_ipv46:
if len(result) == max_total:
break
try:
if ip['net'] == 'ipv4':
ipaddr = ip['ip']
prefix = '.origin'
else: # http://www.team-cymru.com/IP-ASN-mapping.html
res = str() # 2001:4860:b002:23::68
for nb in ip['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])
if asn not in asn_count:
asn_count[asn] = 0
if asn_count[asn] == max_per_asn:
continue
asn_count[asn] += 1
result.append(ip)
except:
sys.stderr.write('ERR: Could not resolve ASN for "' + ip['ip'] + '"\n')
asn = lookup_asn(ip['net'], ip['ip'])
if asn is None or asn_count[asn] == max_per_asn:
continue
asn_count[asn] += 1
result.append(ip)
# Add back Onions
result.extend(ips_onion)