106 lines
3.8 KiB
Python
Executable file
106 lines
3.8 KiB
Python
Executable file
#!/usr/bin/env python3
|
|
#
|
|
# Tests the DNS configuration of a Mail-in-a-Box.
|
|
#
|
|
# tests/dns.py ipaddr hostname
|
|
#
|
|
# where ipaddr is the IP address of your Mail-in-a-Box
|
|
# and hostname is the domain name to check the DNS for.
|
|
|
|
import sys, re, difflib
|
|
import dns.reversename, dns.resolver
|
|
|
|
if len(sys.argv) < 3:
|
|
print("Usage: tests/dns.py ipaddress hostname [primary hostname]")
|
|
sys.exit(1)
|
|
|
|
ipaddr, hostname = sys.argv[1:3]
|
|
primary_hostname = hostname
|
|
if len(sys.argv) == 4:
|
|
primary_hostname = sys.argv[3]
|
|
|
|
def test(server, description):
|
|
tests = [
|
|
(hostname, "A", ipaddr),
|
|
#(hostname, "NS", "ns1.%s.;ns2.%s." % (primary_hostname, primary_hostname)),
|
|
("ns1." + primary_hostname, "A", ipaddr),
|
|
("ns2." + primary_hostname, "A", ipaddr),
|
|
("www." + hostname, "A", ipaddr),
|
|
(hostname, "MX", "10 " + primary_hostname + "."),
|
|
(hostname, "TXT", "\"v=spf1 mx -all\""),
|
|
("mail._domainkey." + hostname, "TXT", "\"v=DKIM1; k=rsa; s=email; \" \"p=__KEY__\""),
|
|
#("_adsp._domainkey." + hostname, "TXT", "\"dkim=all\""),
|
|
("_dmarc." + hostname, "TXT", "\"v=DMARC1; p=quarantine;\""),
|
|
]
|
|
return test2(tests, server, description)
|
|
|
|
def test_ptr(server, description):
|
|
ipaddr_rev = dns.reversename.from_address(ipaddr)
|
|
tests = [
|
|
(ipaddr_rev, "PTR", hostname+'.'),
|
|
]
|
|
return test2(tests, server, description)
|
|
|
|
def test2(tests, server, description):
|
|
first = True
|
|
resolver = dns.resolver.get_default_resolver()
|
|
resolver.nameservers = [server]
|
|
for qname, rtype, expected_answer in tests:
|
|
# do the query and format the result as a string
|
|
try:
|
|
response = dns.resolver.query(qname, rtype)
|
|
except dns.resolver.NoNameservers:
|
|
# host did not have an answer for this query
|
|
print("Could not connect to %s for DNS query." % server)
|
|
sys.exit(1)
|
|
except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
|
|
# host did not have an answer for this query; not sure what the
|
|
# difference is between the two exceptions
|
|
response = ["[no value]"]
|
|
response = ";".join(str(r) for r in response)
|
|
response = re.sub(r"(\"p=).*(\")", r"\1__KEY__\2", response) # normalize DKIM key
|
|
response = response.replace("\"\" ", "") # normalize TXT records (DNSSEC signing inserts empty text string components)
|
|
|
|
# is it right?
|
|
if response == expected_answer:
|
|
#print(server, ":", qname, rtype, "?", response)
|
|
continue
|
|
|
|
# show prolem
|
|
if first:
|
|
print("Incorrect DNS Response from", description)
|
|
print()
|
|
print("QUERY ", "RESPONSE ", "CORRECT VALUE", sep='\t')
|
|
first = False
|
|
|
|
print((qname + "/" + rtype).ljust(20), response.ljust(12), expected_answer, sep='\t')
|
|
return first # success
|
|
|
|
# Test the response from the machine itself.
|
|
if not test(ipaddr, "Mail-in-a-Box"):
|
|
print ()
|
|
print ("Please run the Mail-in-a-Box setup script on %s again." % hostname)
|
|
sys.exit(1)
|
|
else:
|
|
print ("The Mail-in-a-Box provided correct DNS answers.")
|
|
print ()
|
|
|
|
# If those settings are OK, also test Google's Public DNS
|
|
# to see if the machine is hooked up to recursive DNS properly.
|
|
if not test("8.8.8.8", "Google Public DNS"):
|
|
print ()
|
|
print ("Check that the nameserver settings for %s are correct at your domain registrar. It may take a few hours for Google Public DNS to update after changes on your Mail-in-a-Box." % hostname)
|
|
sys.exit(1)
|
|
else:
|
|
print ("Your domain registrar or DNS host appears to be configured correctly as well. Public DNS provides the same answers.")
|
|
print ()
|
|
|
|
# And if that's OK, also check reverse DNS (the PTR record).
|
|
if not test_ptr("8.8.8.8", "Google Public DNS (Reverse DNS)"):
|
|
print ()
|
|
print ("The reverse DNS for %s is not correct. Consult your ISP for how to set the reverse DNS (also called the PTR record) for %s to %s." % (hostname, hostname, ipaddr))
|
|
sys.exit(1)
|
|
else:
|
|
print ("And the reverse DNS for the domain is correct.")
|
|
print ()
|
|
print ("DNS is OK.")
|