slackware-current/source/l/glibc/glibc-2.10-dns-no-gethostbyname4.diff
Patrick J Volkerding 5a12e7c134 Slackware 13.0
Wed Aug 26 10:00:38 CDT 2009
Slackware 13.0 x86_64 is released as stable!  Thanks to everyone who
helped make this release possible -- see the RELEASE_NOTES for the
credits.  The ISOs are off to the replicator.  This time it will be a
6 CD-ROM 32-bit set and a dual-sided 32-bit/64-bit x86/x86_64 DVD.
We're taking pre-orders now at store.slackware.com.  Please consider
picking up a copy to help support the project.  Once again, thanks to
the entire Slackware community for all the help testing and fixing
things and offering suggestions during this development cycle.
As always, have fun and enjoy!  -P.
2018-05-31 22:41:17 +02:00

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Diff

The gethostbyname4() lookup method is problematic since it fires out both
the A and AAAA DNS queries in parallel and over the same socket. This
should work in theory, but it turns out that many cheap DSL modems and
similar devices have buggy DNS servers - if the AAAA query arrives too
quickly after the A query, the server will generate only a single reply
with the A query id but returning an error for the AAAA query; we get
stuck waiting for the second reply.
For gethostbyname4() users affected, disabling IPv6 in the system might
work around the issue, unfortunately it only helps with applications
using AI_ADDRCONFIG (e.g. Firefox); some (notably e.g. Pidgin) neglect
to do that.
Real fix should be using separate ports for the A and AAAA queries.
--- resolv/Versions 2008-08-02 10:26:09.000000000 +0200
+++ resolv/Versions 2008-12-08 12:51:53.000000000 +0100
@@ -102,7 +102,7 @@ libnss_dns {
_nss_dns_gethostbyname_r; _nss_dns_getnetbyaddr_r;
_nss_dns_getnetbyname_r; _nss_dns_getcanonname_r;
_nss_dns_gethostbyaddr2_r;
- _nss_dns_gethostbyname4_r;
+# _nss_dns_gethostbyname4_r;
}
}