MP to fix this bug in Bionic, already reviewed and uploaded: https://code.launchpad.net/~paride/ubuntu/+source/dnsmasq/+git/dnsmasq/+merge/409149
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1785383 Title: missing EDNS0 record confuses systemd-resolved Status in systemd: Fix Released Status in dnsmasq package in Ubuntu: Fix Released Status in systemd package in Ubuntu: Fix Released Status in dnsmasq source package in Bionic: In Progress Status in systemd source package in Bionic: Fix Released Status in dnsmasq source package in Focal: Fix Released Status in systemd source package in Focal: Fix Released Status in dnsmasq source package in Groovy: Fix Released Status in systemd source package in Groovy: Fix Released Status in dnsmasq source package in Hirsute: Fix Released Status in systemd source package in Hirsute: Fix Released Status in dnsmasq source package in Impish: Fix Released Status in systemd source package in Impish: Fix Released Bug description: [Impact] dnsmasq 2.79 and below omits EDNS0 OPT records [1] when returning an empty answer for a domain it is authoritative for. systemd-resolved seems to get confused by this in certain circumstances; when using the stub resolver and requesting an address for which there are no AAAA records, there can sometimes be a five second hang in resolution. [1] https://en.wikipedia.org/wiki/Extension_Mechanisms_for_DNS [Test Plan] Test case for bionic: ----------------------------------------- IFACE=dummy0 SUBNET=10.0.0 ip link add $IFACE type dummy ifconfig $IFACE ${SUBNET}.1/24 dnsmasq -h -R -d -C /dev/null -2 $IFACE -z -i $IFACE -I lo --host-record=test.test,${SUBNET}.1 --server=/test/ & dig -t a test.test @10.0.0.1 | grep EDNS # returns "; EDNS ..." dig -t aaaa test.test @10.0.0.1 | grep EDNS # again, should return "; EDNS ..." but doesn't. # does so with the -proposed package. ----------------------------------------- [Where problems could occur] Problems may occur in case a client queries dnsmasq and relies on EDNS0 not being available for behaving correctly. This covers cases where the software querying dnsmasq is buggy or misconfigured. [Development Fix] Fixed upstream in dnsmasq >= 2.80. [Stable Fix] Partial cherry-pick of upstream commit http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=1682d15a744880b0398af75eadf68fe66128af78 The cherry-pick is partial because half if it is already in the package .diff we have in Bionic. To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1785383/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
