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Code Issues Releases Wiki Activity

Add dns time out handling changes

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This commit is contained in:
KiekerJan 2022-10-26 23:14:57 +02:00
parent 8d8d6e158b
commit ecbb210058
2 changed files with 40 additions and 18 deletions
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26
management/dns_update.py
View File

@ -1030,17 +1030,29 @@ def set_secondary_dns(hostnames, env):
resolver = dns.resolver.get_default_resolver()
resolver.timeout = 5
resolver.lifetime = 5
for item in hostnames:
if not item.startswith("xfr:"):
# Resolve hostname.
try:
response = resolver.resolve(item, "A")
except (dns.resolver.NoNameservers, dns.resolver.NXDOMAIN, dns.resolver.NoAnswer, dns.resolver.Timeout):
tries = 2
while tries > 0:
tries = tries - 1
try:
response = resolver.resolve(item, "AAAA")
except (dns.resolver.NoNameservers, dns.resolver.NXDOMAIN, dns.resolver.NoAnswer, dns.resolver.Timeout):
raise ValueError("Could not resolve the IP address of %s." % item)
response = resolver.resolve(item, "A")
tries = 0
except (dns.resolver.NoNameservers, dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
try:
response = resolver.resolve(item, "AAAA")
tries = 0
except (dns.resolver.NoNameservers, dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
raise ValueError("Could not resolve the IP address of %s." % item)
except (dns.resolver.Timeout):
if tries < 1:
raise ValueError("Could not resolve the IP address of %s due to timeout." % item)
except (dns.resolver.Timeout):
if tries < 1:
raise ValueError("Could not resolve the IP address of %s due to timeout." % item)
else:
# Validate IP address.
try:

32
management/status_checks.py
View File

@ -303,7 +303,7 @@ def run_network_checks(env, output):
# by a spammer, or the user may be deploying on a residential network. We
# will not be able to reliably send mail in these cases.
rev_ip4 = ".".join(reversed(env['PUBLIC_IP'].split('.')))
zen = query_dns(rev_ip4+'.zen.spamhaus.org', 'A', nxdomain=None)
zen = query_dns(rev_ip4+'.zen.spamhaus.org', 'A', nxdomain=None, retry = False)
if zen is None:
output.print_ok("IP address is not blacklisted by zen.spamhaus.org.")
elif zen == "[timeout]":
@ -739,7 +739,7 @@ def check_mail_domain(domain, env, output):
# Stop if the domain is listed in the Spamhaus Domain Block List.
# The user might have chosen a domain that was previously in use by a spammer
# and will not be able to reliably send mail.
dbl = query_dns(domain+'.dbl.spamhaus.org', "A", nxdomain=None)
dbl = query_dns(domain+'.dbl.spamhaus.org', "A", nxdomain=None, retry=False)
if dbl is None:
output.print_ok("Domain is not blacklisted by dbl.spamhaus.org.")
elif dbl == "[timeout]":
@ -775,7 +775,7 @@ def check_web_domain(domain, rounded_time, ssl_certificates, env, output):
# website for also needs a signed certificate.
check_ssl_cert(domain, rounded_time, ssl_certificates, env, output)
def query_dns(qname, rtype, nxdomain='[Not Set]', at=None, as_list=False):
def query_dns(qname, rtype, nxdomain='[Not Set]', at=None, as_list=False, retry=True):
# Make the qname absolute by appending a period. Without this, dns.resolver.query
# will fall back a failed lookup to a second query with this machine's hostname
# appended. This has been causing some false-positive Spamhaus reports. The
@ -800,15 +800,25 @@ def query_dns(qname, rtype, nxdomain='[Not Set]', at=None, as_list=False):
# lifetime expires a dns.exception.Timeout exception will be raised.
resolver.lifetime = 5
if retry:
tries = 2
else:
tries = 1
# Do the query.
try:
response = resolver.resolve(qname, rtype)
except (dns.resolver.NoNameservers, 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.
return nxdomain
except dns.exception.Timeout:
return "[timeout]"
while tries > 0:
tries = tries - 1
try:
response = resolver.resolve(qname, rtype, search=True)
tries = 0
except (dns.resolver.NoNameservers, 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.
if tries < 1:
return nxdomain
except dns.exception.Timeout:
if tries < 1:
return "[timeout]"
# Normalize IP addresses. IP address --- especially IPv6 addresses --- can
# be expressed in equivalent string forms. Canonicalize the form before