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authorMartin Pitt <martin.pitt@ubuntu.com>2016-12-22 07:58:02 +0100
committerGitHub <noreply@github.com>2016-12-22 07:58:02 +0100
commit4050e04b2c3ff2a1ae458089735ff787fadb0038 (patch)
treea5004b85e134ec9f13690c0b8fbdd10b14b0f385 /test/networkd-test.py
parenteb64b435ebb2a7cb1274d5f8d8c323905caf29bc (diff)
resolved: correctly handle non-address RR types with /etc/hosts lookups (#4808)
Fix wrong condition test in manager_etc_hosts_lookup(), which caused it to return an IPv4 answer when an IPv6 question was asked, and vice versa. Also only return success if we actually found any A or AAAA record. In systemd-resolved.service(8), point out that /etc/hosts mappings only affect address-type lookups, not other types. The test case currently disables DNSSEC in resolved, as there is a bug where "-t MX" fails due to "DNSSEC validation failed" even after "downgrading to non-DNSSEC mode". This should be dropped once that bug gets fixed. Fixes #4801
Diffstat (limited to 'test/networkd-test.py')
-rwxr-xr-xtest/networkd-test.py55
1 files changed, 55 insertions, 0 deletions
diff --git a/test/networkd-test.py b/test/networkd-test.py
index 39bd4f5b1b..f178a144f0 100755
--- a/test/networkd-test.py
+++ b/test/networkd-test.py
@@ -504,6 +504,61 @@ Domains= ~company ~lab''')
self.assertRegex(general_log, 'query.*megasearch.net')
self.assertNotIn('megasearch.net', vpn_log)
+ def test_resolved_etc_hosts(self):
+ '''resolved queries to /etc/hosts'''
+
+ # FIXME: -t MX query fails with enabled DNSSEC (even when using
+ # the known negative trust anchor .internal instead of .example)
+ conf = '/run/systemd/resolved.conf.d/test-disable-dnssec.conf'
+ os.makedirs(os.path.dirname(conf), exist_ok=True)
+ with open(conf, 'w') as f:
+ f.write('[Resolve]\nDNSSEC=no')
+ self.addCleanup(os.remove, conf)
+
+ # create /etc/hosts bind mount which resolves my.example for IPv4
+ hosts = os.path.join(self.workdir, 'hosts')
+ with open(hosts, 'w') as f:
+ f.write('172.16.99.99 my.example\n')
+ subprocess.check_call(['mount', '--bind', hosts, '/etc/hosts'])
+ self.addCleanup(subprocess.call, ['umount', '/etc/hosts'])
+ subprocess.check_call(['systemctl', 'stop', 'systemd-resolved.service'])
+
+ # note: different IPv4 address here, so that it's easy to tell apart
+ # what resolved the query
+ self.create_iface(dnsmasq_opts=['--host-record=my.example,172.16.99.1,2600::99:99',
+ '--host-record=other.example,172.16.0.42,2600::42',
+ '--mx-host=example,mail.example'],
+ ipv6=True)
+ self.do_test(coldplug=None, ipv6=True)
+
+ try:
+ # family specific queries
+ out = subprocess.check_output(['systemd-resolve', '-4', 'my.example'])
+ self.assertIn(b'my.example: 172.16.99.99', out)
+ # we don't expect an IPv6 answer; if /etc/hosts has any IP address,
+ # it's considered a sufficient source
+ self.assertNotEqual(subprocess.call(['systemd-resolve', '-6', 'my.example']), 0)
+ # "any family" query; IPv4 should come from /etc/hosts
+ out = subprocess.check_output(['systemd-resolve', 'my.example'])
+ self.assertIn(b'my.example: 172.16.99.99', out)
+ # IP → name lookup; again, takes the /etc/hosts one
+ out = subprocess.check_output(['systemd-resolve', '172.16.99.99'])
+ self.assertIn(b'172.16.99.99: my.example', out)
+
+ # non-address RRs should fall back to DNS
+ out = subprocess.check_output(['systemd-resolve', '--type=MX', 'example'])
+ self.assertIn(b'example IN MX 1 mail.example', out)
+
+ # other domains query DNS
+ out = subprocess.check_output(['systemd-resolve', 'other.example'])
+ self.assertIn(b'172.16.0.42', out)
+ out = subprocess.check_output(['systemd-resolve', '172.16.0.42'])
+ self.assertIn(b'172.16.0.42: other.example', out)
+ except (AssertionError, subprocess.CalledProcessError):
+ self.show_journal('systemd-resolved.service')
+ self.print_server_log()
+ raise
+
def test_transient_hostname(self):
'''networkd sets transient hostname from DHCP'''