https://issues.apache.org/bugzilla/show_bug.cgi?id=50656
Summary: HTTPD does not understand DNAME response to DNS [PTR]
query.
Product: Apache httpd-2
Version: 2.2.17
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Core
AssignedTo: [email protected]
ReportedBy: [email protected]
Saw this with version 2.2.17:
Syslog:
Jan 24 05:16:01 (none) httpd: gethostby*.getanswer: asked for
"5.b.6.7.8.2.e.f.f.f.1.4.2.2.2.0.1.0.0.0.c.8.c.d.0.7.4.0.1.0.0.2.ip6.arpa IN
PTR", got type "39"
; <<>> DiG 9.8.0b1 <<>>
5.b.6.7.8.2.e.f.f.f.1.4.2.2.2.0.1.0.0.0.c.8.c.d.0.7.4.0.1.0.0.2.ip6.arpa any
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60064
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 3, ADDITIONAL: 0
;; QUESTION SECTION:
;5.b.6.7.8.2.e.f.f.f.1.4.2.2.2.0.1.0.0.0.c.8.c.d.0.7.4.0.1.0.0.2.ip6.arpa. IN
ANY
;; ANSWER SECTION:
1.0.0.0.c.8.c.d.0.7.4.0.1.0.0.2.ip6.arpa. 3600 IN DNAME rev.gensokyo.de.
5.b.6.7.8.2.e.f.f.f.1.4.2.2.2.0.1.0.0.0.c.8.c.d.0.7.4.0.1.0.0.2.ip6.arpa. 3600
IN CNAME 5.b.6.7.8.2.e.f.f.f.1.4.2.2.2.0.rev.gensokyo.de.
5.b.6.7.8.2.e.f.f.f.1.4.2.2.2.0.rev.gensokyo.de. 3600 IN PTR
izayoi.sakuya.gensokyo.de.
;; AUTHORITY SECTION:
gensokyo.de. 86400 IN NS ns2.jvnv.net.
gensokyo.de. 86400 IN NS ns3.jvnv.net.
gensokyo.de. 86400 IN NS ns1.jvnv.net.
;; Query time: 811 msec
;; SERVER: ::1#53(::1)
;; WHEN: Tue Jan 25 23:46:58 2011
;; MSG SIZE rcvd: 255
HTTPD should be parsing the DNS answer looking for the specified query type (in
this case, PTR). It should not assume that the first answer is of the desired
type. The answer given by DNS for a DNAME is proper per RFC 2672: It's
returning the DNAME record, the optional synthesized CNAME (which should have a
TTL of zero; this one doesn't), and the synthesized resulting record of the
query type requested. As there is a PTR response, it is available and should
be used - even if it wasn't the FIRST answer record.
By the syslog entry, I assume that HTTPD was confused and didn't understand the
reply. That needs to be fixed.
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