83 lines
2.7 KiB
Python
Executable File
83 lines
2.7 KiB
Python
Executable File
#!/usr/bin/python3
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#
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# Tests the DNS configuration of a Mail-in-a-Box.
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#
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# tests/dns.py ipaddr hostname
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#
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# where ipaddr is the IP address of your Mail-in-a-Box
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# and hostname is the domain name to check the DNS for.
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import sys, re, difflib
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import dns.reversename, dns.resolver
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if len(sys.argv) < 3:
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print("Usage: tests/dns.py ipaddress hostname")
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sys.exit(1)
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ipaddr, hostname = sys.argv[1:]
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def test(server, description):
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tests = [
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(hostname, "A", ipaddr),
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(hostname, "NS", "ns1.%s.;ns2.%s." % (hostname, hostname)),
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("ns1." + hostname, "A", ipaddr),
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("ns2." + hostname, "A", ipaddr),
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("www." + hostname, "A", ipaddr),
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(hostname, "MX", "10 " + hostname + "."),
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(hostname, "TXT", "\"v=spf1 mx -all\""),
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("mail._domainkey." + hostname, "TXT", "\"v=DKIM1; k=rsa; s=email; \" \"p=__KEY__\""),
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]
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return test2(tests, server, description)
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def test_ptr(server, description):
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ipaddr_rev = dns.reversename.from_address(ipaddr)
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tests = [
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(ipaddr_rev, "PTR", hostname+'.'),
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]
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return test2(tests, server, description)
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def test2(tests, server, description):
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first = True
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resolver = dns.resolver.get_default_resolver()
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resolver.nameservers = [server]
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for qname, rtype, expected_answer in tests:
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# do the query and format the result as a string
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response = dns.resolver.query(qname, rtype)
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response = ";".join(str(r) for r in response)
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response = re.sub(r"(\"p=).*(\")", r"\1__KEY__\2", response) # normalize DKIM key
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# is it right?
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if response == expected_answer:
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#print(server, ":", qname, rtype, "?", response)
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continue
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# show prolem
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if first:
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print("Incorrect DNS Response from", description)
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print()
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first = False
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print(qname, rtype, "got", repr(response), "but we should have gotten", repr(expected_answer))
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return first # success
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# Test the response from the machine itself.
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if not test(ipaddr, "Mail-in-a-Box"):
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print ()
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print ("Please run the Mail-in-a-Box setup script on %s again." % hostname)
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sys.exit(1)
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else:
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# If those settings are OK, also test Google's Public DNS
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# to see if the machine is hooked up to recursive DNS properly.
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if not test("8.8.8.8", "Google Public DNS"):
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print ()
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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)
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sys.exit(1)
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else:
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# And if that's OK, also check reverse DNS (the PTR record).
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if not test_ptr("8.8.8.8", "Google Public DNS (Reverse DNS)"):
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print ()
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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))
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sys.exit(1)
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else:
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print ("DNS is OK.")
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