Hello Timo, or anyone else affected, Accepted dnsmasq into jammy-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/dnsmasq/2.86-1.1ubuntu0.5 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed- jammy to verification-done-jammy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification- failed-jammy. In either case, without details of your testing we will not be able to proceed. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping! N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days. ** Changed in: dnsmasq (Ubuntu Jammy) Status: In Progress => Fix Committed ** Tags added: verification-needed verification-needed-jammy -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to dnsmasq in Ubuntu. https://bugs.launchpad.net/bugs/2042587 Title: jammy's version breaks existing dhcp scripts with relay Status in dnsmasq package in Ubuntu: Fix Released Status in dnsmasq source package in Jammy: Fix Committed Bug description: [ Impact ] When upgrading from focal to jammy, existing dnsmasq dhcp-scripts stopped working in an environment where a DHCP relay is in use. Instead of the expected client IP address, the script gets the _relay_ IP address as an argument. This was fixed in 2.87, therefore making only jammy carry an affected package. [ Test Plan ] To easily test this on a single machine, a test script is being provided to setup networking and dnsmasq configuration. # Launch a jammy VM lxc launch ubuntu-daily:jammy j-dnsmasq-2042587 --vm # open a root shell in that VM. All subsequent commands must be executed as root in that VM lxc shell j-dnsmasq-2042587 # download test script wget https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/2042587/+attachment/5738174/+files/setup- and-server.sh # make it executable chmod +x setup-and-server.sh # install dnsmasq. Ignore the postinst error (because systemd-resolved is also running and there is a port conflict) apt update && apt install dnsmasq -y # run the setup script. It will configure things and start dnsmasq ready to be tested ./setup-and-server.sh # in another root session inside the vm (so run "lxc shell j-dnsmasq-2042587" in another terminal), run the proposed commands from the setup script (and press ctrl-c after the result is shown): No DHCP relay: ip netns exec client dhclient -d -v p2 The setup script should log an IP that is not a relay. For example: dnsmasq-dhcp: DHCPDISCOVER(p1) aa:a0:9d:00:5b:d6 dnsmasq-dhcp: DHCPOFFER(p1) 192.168.47.150 aa:a0:9d:00:5b:d6 dnsmasq-dhcp: DHCPREQUEST(p1) 192.168.47.150 aa:a0:9d:00:5b:d6 dnsmasq-dhcp: DHCPACK(p1) 192.168.47.150 aa:a0:9d:00:5b:d6 j-dnsmasq-2042587 ########################### IP = 192.168.47.150 ########################### With DHCP relay set to 192.168.47.9, IP should NOT be that address: ip netns exec client dhclient -d -v p2 -g 192.168.47.9 With the affected dnsmasq package, we will see an error: dnsmasq-dhcp: DHCPREQUEST(p1) 192.168.47.150 aa:a0:9d:00:5b:d6 dnsmasq-dhcp: DHCPACK(p1) 192.168.47.150 aa:a0:9d:00:5b:d6 j-dnsmasq-2042587 ########################### IP = 192.168.47.9 TEST FAILED ########################### The error is that the obtained IP is that of the dhcp relay (provided via the -g option). With the fixed dnsmasq package, "TEST FAILED" must not appear, and the IP should not be that of the provided dhcp relay. [ Where problems could occur ] If the fix is incorrect, it would mean the dhcp-script would get an incorrect IP again, or perhaps we could have crashes in dnsmasq when dealing with buffers and pointers if the dhcp-script option is in use. This fix was committed upstream a few months after the bug was introduced, so it took a while to be noticed. [ Other Info ] Not at this time. [ Original description ] When upgrading from focal to jammy, existing dnsmasq dhcp-scripts stopped working in an environment where a DHCP relay is in use. Instead of the expected client IP address, the script gets the _relay_ IP address as an argument. From dnsmasq documentation for --dhcp- script: > The arguments to the process are "add", "old" or "del", the MAC address of the host (or DUID for IPv6) , the IP address, and the hostname, if known. I believe the change has been inadverently made in upstream commit 527c3c7d0d3bb4bf5fad699f10cf0d1a45a54692 (https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blobdiff;f=src/helper.c;h=02340a01c00031db0cc682c8a4a279cfc1db574e;hp=d81de9622e6d484a264496b2cd3638b4e15e9677;hb=527c3c7d0d3bb4bf5fad699f10cf0d1a45a54692;hpb=fcb4dcaf7cc8a86ac2533b933161b6455f75bf8f) as the commit message only speaks about inet_ntoa replacement and not the behavioral change it also introduces (previously the relay address was only set to the environment variable, now it effectively overrides the prevoiusly set client's IP address). dnsmasq 2.86-1.1ubuntu0.3 / Ubuntu 22.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/2042587/+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
