Yaketty has either broken ndots or enforced it to 1.
ndots:1
ping host => search is appended. Never tried as fqdn.
ping host.name => search is not appended, even if nxdomain
ndots:2
ping host => search is appended. Never tried as fqdn.
ping host.name => search is not appended, even if nxdomain. This is bad.
ndots:3
ping host => search is appended. Never tried as fqdn.
ping host.name => search is not appended, even if nxdomain. This is bad.
Expected behaviour :
For queries with less than ndots : try to resolve with search-list appended, if
it fails (nxdomain), try as FQDN/absolute name.
For queries with ndots or more dot : Only resolve as FQDN/absolute name.
Ubuntu GLIBC 2.24-3ubuntu2)
** Also affects: glibc (Ubuntu)
Importance: Undecided
Status: New
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1674273
Title:
Resolver ignores ndots option
Status in glibc package in Ubuntu:
Confirmed
Status in linux package in Ubuntu:
Confirmed
Status in glibc source package in Xenial:
Confirmed
Status in linux source package in Xenial:
Confirmed
Bug description:
This is a re-report of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/401202 since that
one was apparently closed as no-fix simply because it was too old.
This still occurs in xenial.
Original description:
Regardless of ndots option in /etc/resolv.conf, when NXDOMAIN is returned
from the DNS server then resolver always try another attempt with the original
name extended by what is in search option.
For example, if you're looking for very.long.url.nowhere and there is a line
"search ubuntu.com" in resolv.conf you will get addres of server
very.long.url.nowhere.ubuntu.com if such exists. It is incorrect, it should
occurs only for urls having less that ndots option dots in its name.
My system is a standard Ubuntu Xenial desktop amd64 using network
manager and the default configured Wired Connection 1 (i.e. DHCP).
To reproduce:
- sudo install /dev/fd/0 /etc/NetworkManager/dnsmasq.d/domain
<<<'log-queries=extra'
- sudo killall dnsmasq
- ping some.long.non-existent.name
- Watch /var/log/syslog
In my case:
Mar 20 23:19:22 eragon dnsmasq[27367]: 46 127.0.0.1/40646 query[A]
some.long.non-existent.name from 127.0.0.1
Mar 20 23:19:22 eragon dnsmasq[27367]: 46 127.0.0.1/40646 forwarded
some.long.non-existent.name to 192.168.5.1
Mar 20 23:19:22 eragon dnsmasq[27367]: 46 127.0.0.1/40646 reply
some.long.non-existent.name is NXDOMAIN
Mar 20 23:19:22 eragon dnsmasq[27367]: 47 127.0.0.1/52417 query[A]
some.long.non-existent.name.sebunger.dnsalias.org from 127.0.0.1
Mar 20 23:19:22 eragon dnsmasq[27367]: 47 127.0.0.1/52417 forwarded
some.long.non-existent.name.sebunger.dnsalias.org to 192.168.5.1
Mar 20 23:19:23 eragon dnsmasq[27367]: 47 127.0.0.1/52417 reply
some.long.non-existent.name.sebunger.dnsalias.org is <CNAME>
Mar 20 23:19:23 eragon dnsmasq[27367]: 47 127.0.0.1/52417 reply
sebunger.dnsalias.org is 203.173.156.30
My /etc/resolv.conf (which is a sym-link to ../run/resolvconf/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
search sebunger.dnsalias.org
options ndots:1
(I added the options ndots with no effect)
---
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-id',
'/dev/snd/by-path', '/dev/snd/pcmC1D0c', '/dev/snd/controlC1',
'/dev/snd/hwC0D0', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1c',
'/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p',
'/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 16.04
EcryptfsInUse: Yes
IwConfig:
enp2s0 no wireless extensions.
lo no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. GA-MA770-UD3
NonfreeKernelModules: nvidia_uvm nvidia
Package: linux (not installed)
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-66-generic
root=/dev/mapper/vg0-root ro rootdelay=120 quiet splash
ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-4.4.0-66-generic N/A
linux-backports-modules-4.4.0-66-generic N/A
linux-firmware 1.157.8
RfKill:
Tags: xenial xenial
Uname: Linux 4.4.0-66-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm audio cdrom dialout dip floppy kvm lpadmin plugdev sambashare
ssh sudo users video
_MarkForUpload: True
dmi.bios.date: 06/12/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: FB
dmi.board.name: GA-MA770-UD3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias:
dmi:bvnAwardSoftwareInternational,Inc.:bvrFB:bd06/12/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA770-UD3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA770-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA770-UD3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
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