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* [Bug libc/10128] New: __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR @ 2009-05-04 22:49 aurelien at aurel32 dot net 2009-05-05 14:49 ` [Bug libc/10128] " drepper at redhat dot com ` (2 more replies) 0 siblings, 3 replies; 5+ messages in thread From: aurelien at aurel32 dot net @ 2009-05-04 22:49 UTC (permalink / raw) To: glibc-bugs Now that the glibc send both IPv4 and IPv6 requests in parallel, name resolution does not work anymore on DNS servers returning *two answers*, but NOTIMP or FORMERR to the AAAA query and NOERROR on the A query. This is broken according to the RFC, but it seems a common mistake among broken DNS software. The recent changes to switch back to single request mode in case of timeout does not work here (as both queries are answered), so I propose the following patch below to solve the issue: 2009-05-05 Aurelien Jarno <aurelien@aurel32.net> * resolv/res_query.c (__libc_res_nquery): If one query returns NOTIMP or FORMERR and the other NOERROR, don't raise an error. --- a/resolv/res_query.c +++ b/resolv/res_query.c @@ -289,6 +289,10 @@ __libc_res_nquery(res_state statp, break; case FORMERR: case NOTIMP: + if ((hp->rcode == NOERROR && ntohs (hp->ancount) != 0) + || (hp2->rcode == NOERROR + && ntohs (hp2->ancount) != 0)) + goto success; case REFUSED: default: RES_SET_H_ERRNO(statp, NO_RECOVERY); -- Summary: __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR Product: glibc Version: unspecified Status: NEW Severity: normal Priority: P2 Component: libc AssignedTo: drepper at redhat dot com ReportedBy: aurelien at aurel32 dot net CC: glibc-bugs at sources dot redhat dot com GCC build triplet: x86_64-unknown-linux-gnu GCC host triplet: x86_64-unknown-linux-gnu GCC target triplet: x86_64-unknown-linux-gnu http://sourceware.org/bugzilla/show_bug.cgi?id=10128 ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libc/10128] __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR 2009-05-04 22:49 [Bug libc/10128] New: __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR aurelien at aurel32 dot net @ 2009-05-05 14:49 ` drepper at redhat dot com 2009-05-05 15:36 ` aurelien at aurel32 dot net 2009-05-09 16:12 ` drepper at redhat dot com 2 siblings, 0 replies; 5+ messages in thread From: drepper at redhat dot com @ 2009-05-05 14:49 UTC (permalink / raw) To: glibc-bugs ------- Additional Comments From drepper at redhat dot com 2009-05-05 14:48 ------- Where is such a server? And why can you claim "common"? -- What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |WAITING http://sourceware.org/bugzilla/show_bug.cgi?id=10128 ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libc/10128] __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR 2009-05-04 22:49 [Bug libc/10128] New: __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR aurelien at aurel32 dot net 2009-05-05 14:49 ` [Bug libc/10128] " drepper at redhat dot com @ 2009-05-05 15:36 ` aurelien at aurel32 dot net 2009-05-09 16:12 ` drepper at redhat dot com 2 siblings, 0 replies; 5+ messages in thread From: aurelien at aurel32 dot net @ 2009-05-05 15:36 UTC (permalink / raw) To: glibc-bugs ------- Additional Comments From aurelien at aurel32 dot net 2009-05-05 15:36 ------- > Where is such a server? It's a DSL router, I don't have the exact reference. > And why can you claim "common"? I don't say "common", but "common among broken DNS software". A few Debian users reported the exact same problem. Google also has a few entries about this problem. And this is one of the problems about AAAA query listed during RIPE-48 session: http://www.ripe.net/ripe/meetings/ripe-48/presentations/ripe48-dns-malone.pdf -- http://sourceware.org/bugzilla/show_bug.cgi?id=10128 ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libc/10128] __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR 2009-05-04 22:49 [Bug libc/10128] New: __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR aurelien at aurel32 dot net 2009-05-05 14:49 ` [Bug libc/10128] " drepper at redhat dot com 2009-05-05 15:36 ` aurelien at aurel32 dot net @ 2009-05-09 16:12 ` drepper at redhat dot com 2 siblings, 0 replies; 5+ messages in thread From: drepper at redhat dot com @ 2009-05-09 16:12 UTC (permalink / raw) To: glibc-bugs ------- Additional Comments From drepper at redhat dot com 2009-05-09 16:12 ------- I've used the patch. -- What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |RESOLVED Resolution| |FIXED http://sourceware.org/bugzilla/show_bug.cgi?id=10128 ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ^ permalink raw reply [flat|nested] 5+ messages in thread
[parent not found: <bug-10128-131@http.sourceware.org/bugzilla/>]
* [Bug libc/10128] __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR [not found] <bug-10128-131@http.sourceware.org/bugzilla/> @ 2014-06-30 9:15 ` fweimer at redhat dot com 0 siblings, 0 replies; 5+ messages in thread From: fweimer at redhat dot com @ 2014-06-30 9:15 UTC (permalink / raw) To: glibc-bugs https://sourceware.org/bugzilla/show_bug.cgi?id=10128 Florian Weimer <fweimer at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Flags| |security- -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2014-06-30 9:15 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2009-05-04 22:49 [Bug libc/10128] New: __libc_res_nquery fails if one answer returns NOERROR and the other NOTIMP or FORMERR aurelien at aurel32 dot net 2009-05-05 14:49 ` [Bug libc/10128] " drepper at redhat dot com 2009-05-05 15:36 ` aurelien at aurel32 dot net 2009-05-09 16:12 ` drepper at redhat dot com [not found] <bug-10128-131@http.sourceware.org/bugzilla/> 2014-06-30 9:15 ` fweimer at redhat dot com
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