Public bug reported:
We are using ubuntu 16.04 as our dns recursoron production. We installed
the pdns-recursor package from ubuntu repositories, pdns-recursor
(4.0.0~alpha2-2ubuntu0.1) and we faced an issue that is really similar
to this one: https://github.com/PowerDNS/pdns/pull/4377.
Here it is the version installed:
```
# pdns_recursor --version
Aug 30 06:39:50 PowerDNS Recursor 4.0.0-alpha2 (C) 2001-2016 PowerDNS.COM BV
Aug 30 06:39:50 Using 64-bits mode. Built using gcc 5.4.0 20160609.
Aug 30 06:39:50 PowerDNS comes with ABSOLUTELY NO WARRANTY. This is free
software, and you are welcome to redistribute it according to the terms of the
GPL version 2.
Aug 30 06:39:50 Features: openssl lua
Aug 30 06:39:50 Configured with: " '--build=x86_64-linux-gnu' '--prefix=/usr'
'--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
'--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var'
'--disable-silent-rules' '--libdir=${prefix}/lib/x86_64-linux-gnu'
'--libexecdir=${prefix}/lib/x86_64-linux-gnu' '--disable-maintainer-mode'
'--disable-dependency-tracking' '--sysconfdir=/etc/powerdns'
'--enable-reproducible' '--with-lua' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g
-O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security'
'LDFLAGS=-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now -latomic'
'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' 'CXXFLAGS=-g -O2 -fPIE
-fstack-protector-strong -Wformat -Werror=format-security
-DPACKAGEVERSION='\''"4.0.0~alpha2-2ubuntu0.1.Ubuntu"'\'''"
```
And here is the output of a dig request:
```
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 16855
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;<Some server internaly>. IN A
;; Query time: 654 msec
;; SERVER: 10.176.228.2#53(10.176.228.2)
;; WHEN: Fri Aug 30 08:13:13 CEST 2019
;; MSG SIZE rcvd: 68
```
Without changing anything to the configuration, we installed the
upstream 4.0.X series version.
Here you find the output of the version number, and the same dig request
as above:
```# pdns_recursor --version
Aug 30 07:03:37 PowerDNS Recursor 4.0.9 (C) 2001-2017 PowerDNS.COM BV
Aug 30 07:03:37 Using 64-bits mode. Built using gcc 5.4.0 20160609 on Nov 6
2018 16:30:52 by root@505b66e59573.
Aug 30 07:03:37 PowerDNS comes with ABSOLUTELY NO WARRANTY. This is free
software, and you are welcome to redistribute it according to the terms of the
GPL version 2.
Aug 30 07:03:37 Features: openssl lua
Aug 30 07:03:37 Configured with: " '--host=' '--build=' '--prefix=/usr'
'--sysconfdir=/etc/powerdns' '--mandir=${prefix}/share/man'
'--infodir=${prefix}/share/info' '--libdir=${prefix}/lib/'
'--libexecdir=${prefix}/lib' '--with-lua' '--with-protobuf=yes'
'--enable-systemd' '--with-systemd=/lib/systemd/system' 'build_alias='
'host_alias=' 'CFLAGS=-g -O2 -fPIE -fstack-protector-strong -Wformat
-Werror=format-security' 'LDFLAGS=-Wl,-Bsymbolic-functions -fPIE -pie
-Wl,-z,relro -Wl,-z,now' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
'CXXFLAGS=-g -O2 -fPIE -fstack-protector-strong -Wformat
-Werror=format-security'"
```
```
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @10.176.228.2
storage-dc1r03n12.fuel.eu-zrh.hub.k.grp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50592
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;<Some server internaly>. IN A
;; ANSWER SECTION:
<Some server internaly>. 0 IN A 10.X.X.X
;; Query time: 164 msec
;; SERVER: 10.176.228.2#53(10.176.228.2)
;; WHEN: Fri Aug 30 08:53:48 CEST 2019
;; MSG SIZE rcvd: 84
```
Please backport bugfix for pdns_recursor, or update the distributed
package to the last 4.0.X version.
Version of ubuntu:
# cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.5 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.5 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/";
SUPPORT_URL="http://help.ubuntu.com/";
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial
Regards,
Luis Domingues
** Affects: pdns-recursor (Ubuntu)
Importance: Undecided
Status: New
** Tags: xenial
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1842034
Title:
pdns-recursor: make the record cache forward-aware
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