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* [Bug network/14505] New: AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts
@ 2012-08-21 21:49 law at redhat dot com
2012-08-22 4:21 ` [Bug network/14505] " tore at fud dot no
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: law at redhat dot com @ 2012-08-21 21:49 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14505
Bug #: 14505
Summary: AI_ADDRCONFIG does not suppress IN A lookups from
IPV6-only hosts
Product: glibc
Version: 2.17
Status: NEW
Severity: normal
Priority: P2
Component: network
AssignedTo: unassigned@sourceware.org
ReportedBy: law@redhat.com
Classification: Unclassified
When looking a host name using getaddrinfo() with AI_ADDRCONFIG from an
IPv6-only host, IN A queries are sent to the DNS server. According to RFC 3493,
they should not.
Steps to Reproduce:
1. Ensure the system is IPv6-only (it is optional remove 127.0.0.1/8 from the
loopback interface, as it is ignored by getaddrinfo() for the purposes of
determining whether or not the system has IPv4 connectivity or not). My test
system gives the following output:
[tore@laptop ~]$ ip -4 address list; ip -4 route list
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
inet 127.0.0.1/8 scope host lo
[tore@laptop ~]$
2. Ensure the system has a working IPv6 DNS server configured in
/etc/resolv.conf, "echo nameserver 2001:4860:4860::8888 > /etc/resolv.conf"
should do the trick.
3. Download and compile my getaddrinfo() test program from http://fud.no/gai.c
(or use any other getaddrinfo() test program that can be made to use
AI_ADDRCONFIG): "wget -O - http://fud.no/gai.c | gcc -x c -o gai -"
4. Start a tcpdump to inspect DNS server traffic: "tcpdump -i any -n port 53"
5. Resolve a host name using getaddrinfo() w/AI_ADDRCONFIG, e.g. "./gai -ac
www.ripe.net"
Actual results:
The tcpdump process reports queries being made for both A and AAAA resource
records:
11:16:00.685198 IP6 2a02:c0:1002:101:c449:7c3d:76b6:bbd1.48007 >
2001:4860:4860::8888.domain: 44105+ A? www.ripe.net. (30)
11:16:00.685235 IP6 2a02:c0:1002:101:c449:7c3d:76b6:bbd1.48007 >
2001:4860:4860::8888.domain: 35929+ AAAA? www.ripe.net. (30)
11:16:00.727253 IP6 2001:4860:4860::8888.domain >
2a02:c0:1002:101:c449:7c3d:76b6:bbd1.48007: 44105 1/0/0 A 193.0.6.139 (46)
11:16:00.727278 IP6 2001:4860:4860::8888.domain >
2a02:c0:1002:101:c449:7c3d:76b6:bbd1.48007: 35929 1/0/0 AAAA
2001:67c:2e8:22::c100:68b (58)
Expected results:
Only an AAAA record query should have been made; AI_ADDRCONFIG should have
suppressed the A queries.
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* [Bug network/14505] AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts
2012-08-21 21:49 [Bug network/14505] New: AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts law at redhat dot com
@ 2012-08-22 4:21 ` tore at fud dot no
2012-08-22 16:35 ` law at redhat dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: tore at fud dot no @ 2012-08-22 4:21 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14505
Tore Anderson <tore at fud dot no> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tore at fud dot no
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* [Bug network/14505] AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts
2012-08-21 21:49 [Bug network/14505] New: AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts law at redhat dot com
2012-08-22 4:21 ` [Bug network/14505] " tore at fud dot no
@ 2012-08-22 16:35 ` law at redhat dot com
2012-08-22 17:43 ` law at redhat dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: law at redhat dot com @ 2012-08-22 16:35 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14505
--- Comment #1 from law at redhat dot com 2012-08-22 16:35:18 UTC ---
Created attachment 6599
--> http://sourceware.org/bugzilla/attachment.cgi?id=6599
Potential fix
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* [Bug network/14505] AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts
2012-08-21 21:49 [Bug network/14505] New: AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts law at redhat dot com
2012-08-22 4:21 ` [Bug network/14505] " tore at fud dot no
2012-08-22 16:35 ` law at redhat dot com
@ 2012-08-22 17:43 ` law at redhat dot com
2012-08-22 19:19 ` psimerda at redhat dot com
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: law at redhat dot com @ 2012-08-22 17:43 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14505
law at redhat dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #2 from law at redhat dot com 2012-08-22 17:43:08 UTC ---
Attached patch was checked in as 8479f23aa1d5e5477a37f46823856bdafaedfa46
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* [Bug network/14505] AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts
2012-08-21 21:49 [Bug network/14505] New: AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts law at redhat dot com
` (2 preceding siblings ...)
2012-08-22 17:43 ` law at redhat dot com
@ 2012-08-22 19:19 ` psimerda at redhat dot com
2012-12-06 7:04 ` gaofeng at cn dot fujitsu.com
2014-06-17 5:55 ` fweimer at redhat dot com
5 siblings, 0 replies; 7+ messages in thread
From: psimerda at redhat dot com @ 2012-08-22 19:19 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14505
Pavel Šimerda <psimerda at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |psimerda at redhat dot com
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* [Bug network/14505] AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts
2012-08-21 21:49 [Bug network/14505] New: AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts law at redhat dot com
` (3 preceding siblings ...)
2012-08-22 19:19 ` psimerda at redhat dot com
@ 2012-12-06 7:04 ` gaofeng at cn dot fujitsu.com
2014-06-17 5:55 ` fweimer at redhat dot com
5 siblings, 0 replies; 7+ messages in thread
From: gaofeng at cn dot fujitsu.com @ 2012-12-06 7:04 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14505
Gao feng <gaofeng at cn dot fujitsu.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gaofeng at cn dot
| |fujitsu.com
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* [Bug network/14505] AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts
2012-08-21 21:49 [Bug network/14505] New: AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts law at redhat dot com
` (4 preceding siblings ...)
2012-12-06 7:04 ` gaofeng at cn dot fujitsu.com
@ 2014-06-17 5:55 ` fweimer at redhat dot com
5 siblings, 0 replies; 7+ messages in thread
From: fweimer at redhat dot com @ 2014-06-17 5:55 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14505
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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end of thread, other threads:[~2014-06-17 5:55 UTC | newest]
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2012-08-21 21:49 [Bug network/14505] New: AI_ADDRCONFIG does not suppress IN A lookups from IPV6-only hosts law at redhat dot com
2012-08-22 4:21 ` [Bug network/14505] " tore at fud dot no
2012-08-22 16:35 ` law at redhat dot com
2012-08-22 17:43 ` law at redhat dot com
2012-08-22 19:19 ` psimerda at redhat dot com
2012-12-06 7:04 ` gaofeng at cn dot fujitsu.com
2014-06-17 5:55 ` fweimer at redhat dot com
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