app-MAIL-temp/app/dns_utils.py

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2019-12-02 01:13:39 +01:00
import dns.resolver
def get_mx_domains(hostname) -> [str]:
answers = dns.resolver.query(hostname, "MX")
ret = []
for a in answers:
record = a.to_text() # for ex '20 alt2.aspmx.l.google.com.'
r = record.split(" ")[1] # alt2.aspmx.l.google.com.
ret.append(r)
return ret
2019-12-06 11:54:01 +01:00
_include_spf = "include:"
def get_spf_domain(hostname) -> [str]:
"""return all domains listed in *include:*"""
try:
answers = dns.resolver.query(hostname, "TXT")
except dns.resolver.NoAnswer:
return []
ret = []
for a in answers: # type: dns.rdtypes.ANY.TXT.TXT
for record in a.strings:
record = record.decode() # record is bytes
if record.startswith("v=spf1"):
parts = record.split(" ")
for part in parts:
if part.startswith(_include_spf):
ret.append(part[part.find(_include_spf) + len(_include_spf) :])
return ret