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[Bug network/12154] Cannot resolve hosts which have aliases not in host name syntax
- From: "charlieb-sourceware.org at budge dot apana.org.au" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Mon, 29 Feb 2016 23:53:00 +0000
- Subject: [Bug network/12154] Cannot resolve hosts which have aliases not in host name syntax
- Auto-submitted: auto-generated
- References: <bug-12154-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=12154
Charlie Brady <charlieb-sourceware.org at budge dot apana.org.au> changed:
What |Removed |Added
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CC| |charlieb-sourceware.org@bud
| |ge.apana.org.au
--- Comment #7 from Charlie Brady <charlieb-sourceware.org at budge dot apana.org.au> ---
(In reply to Florian Weimer from comment #6)
> glibc follows the syntactical requirements of RFC 1123:
>
> http://tools.ietf.org/html/rfc1123#page-13
>
> extended with support for underscores in 1998.
rfc 4592 "The Role of Wildcards in the Domain Name System" (from 2006) needs to
be considered.
I found this issue when investigating lookup failures on the name
3d06bae3-cff4-43c6-825d-96175822a583.um.outlook.com.
DNS is returning a valid response:
Answers
3d06bae3-cff4-43c6-825d-96175822a583.um.outlook.com: type CNAME, class
IN, cname *.um.outlook.com
.glbdns2.microsoft.com
Name: 3d06bae3-cff4-43c6-825d-96175822a583.um.outlook.com
Type: CNAME (Canonical NAME for an alias) (5)
Class: IN (0x0001)
Time to live: 297
Data length: 37
CNAME: *.um.outlook.com.glbdns2.microsoft.com
*.um.outlook.com.glbdns2.microsoft.com: type CNAME, class IN, cname
wildcard-namnorth.um.outlook.com
Name: *.um.outlook.com.glbdns2.microsoft.com
Type: CNAME (Canonical NAME for an alias) (5)
Class: IN (0x0001)
Time to live: 300
Data length: 20
CNAME: wildcard-namnorth.um.outlook.com
wildcard-namnorth.um.outlook.com: type A, class IN, addr 65.55.94.57
Name: wildcard-namnorth.um.outlook.com
Type: A (Host Address) (1)
Class: IN (0x0001)
Time to live: 300
Data length: 4
Address: 65.55.94.57 (65.55.94.57)
wildcard-namnorth.um.outlook.com: type A, class IN, addr 207.46.198.124
Name: wildcard-namnorth.um.outlook.com
Type: A (Host Address) (1)
Class: IN (0x0001)
Time to live: 300
Data length: 4
Address: 207.46.198.124 (207.46.198.124)
which glibc is discarding/ignoring.
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