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test_mail: gracefully handled when the server has no reverse DNS available

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This commit is contained in:
Joshua Tauberer 2014-05-06 10:02:29 -04:00
parent 63ef8f7b04
commit 80b367ab07
1 changed files with 12 additions and 7 deletions
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19
tests/test_mail.py
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@ -38,13 +38,18 @@ server.starttls()
# Verify that the EHLO name matches the server's reverse DNS.
ipaddr = socket.gethostbyname(host) # IPv4 only!
reverse_ip = dns.reversename.from_address(ipaddr) # e.g. "1.0.0.127.in-addr.arpa."
reverse_dns = dns.resolver.query(reverse_ip, 'PTR')[0].target.to_text(omit_final_dot=True) # => hostname
server.ehlo_or_helo_if_needed() # must send EHLO before getting the server's EHLO name
helo_name = server.ehlo_resp.decode("utf8").split("\n")[0] # first line is the EHLO name
if helo_name != reverse_dns:
print("The server's EHLO name does not match its reverse hostname. Check DNS settings.")
sys.exit(1)
print("SMTP EHLO name (%s) is OK." % helo_name)
try:
reverse_dns = dns.resolver.query(reverse_ip, 'PTR')[0].target.to_text(omit_final_dot=True) # => hostname
except dns.resolver.NXDOMAIN:
print("Reverse DNS lookup failed for %s. SMTP EHLO name check skipped." % ipaddr)
reverse_dns = None
if reverse_dns is not None:
server.ehlo_or_helo_if_needed() # must send EHLO before getting the server's EHLO name
helo_name = server.ehlo_resp.decode("utf8").split("\n")[0] # first line is the EHLO name
if helo_name != reverse_dns:
print("The server's EHLO name does not match its reverse hostname. Check DNS settings.")
sys.exit(1)
print("SMTP EHLO name (%s) is OK." % helo_name)
# Login and send a test email.
server.login(emailaddress, pw)