69 lines
1.9 KiB
Python
69 lines
1.9 KiB
Python
"""
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This check attempts to resolve all hostnames/domains in the input URLs.
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URLs which are not resolvable are removed from the config.
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"""
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import logging
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from urllib.parse import urlparse
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from urllib.parse import urlunparse
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import dns.resolver
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from checks.abstract_checker import AbstractChecker
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class Checker(AbstractChecker):
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def __init__(self, config, previous_results=None):
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super().__init__(config, previous_results)
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def run(self):
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"""Executes the check routine, returns result dict"""
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results = {}
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urls = list(self.config.urls)
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for url in urls:
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parsed = urlparse(url)
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results[url] = self.resolve_hostname(parsed.hostname)
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# remove URL if IPv4 non-resolvable
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if not results[url]['resolvable_ipv4']:
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self.config.remove_url(url)
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return results
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def resolve_hostname(self, hostname):
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"""
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Resolve one to IPv4 address(es)
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"""
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result = {
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'hostname': hostname,
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'resolvable_ipv4': False,
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'resolvable_ipv6': False,
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'aliases': [],
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'ipv4_addresses': [],
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'ipv6_addresses': [],
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}
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# IPv4
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try:
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answers = dns.resolver.query(hostname, "A")
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result['resolvable_ipv4'] = True
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for rdata in answers:
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result['ipv4_addresses'].append(rdata.address)
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except Exception as e:
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logging.debug("Hostname %s not resolvable via IPv4. Exception: %r" % (hostname, e))
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# IPv6
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try:
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answers = dns.resolver.query(hostname, "AAAA")
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result['resolvable_ipv6'] = True
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for rdata in answers:
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result['ipv6_addresses'].append(rdata.address)
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except Exception as e:
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logging.debug("Hostname %s not resolvable via IPv6. Exception: %r" % (hostname, e))
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return result
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