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patches/glibc/2.9/170-2.10-dns-no-gethostbyname4.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Fri Jan 28 22:06:49 2011 +0100 (2011-01-28)
changeset 2284 7ede374110e5
parent 1201 c9967a6e3b25
permissions -rw-r--r--
config: add an option not to remove the destination directory

In certain circumstances, removing the destination/installation directory
is a bad idea. For example, when the build environment is already taking
care of sanitising the build tree, and pre-installs stuff in there, it is
a very bad idea to remove the destination directory.

This happens now in buildroot, as the crostool-NG backend now installs the
toolchain in the common host-tools directory, and pre-install there a few
host-utilities (eg. host-automake and host-gawk).

Provide a config knob to turn on/off the removal of the destination
directory, defaulting to 'y' (previous behavior), and forced to 'n' when
used as a backend.

Reported-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     1 Original patch from: gentoo/src/patchsets/glibc/2.9/0080_all_glibc-2.10-dns-no-gethostbyname4.patch

     2 

     3 -= BEGIN original header =-

     4 http://sourceware.org/bugzilla/show_bug.cgi?id=7060

     5 http://bugs.gentoo.org/250468

     6 

     7 The gethostbyname4() lookup method is problematic since it fires out both

     8 the A and AAAA DNS queries in parallel and over the same socket. This

     9 should work in theory, but it turns out that many cheap DSL modems and

    10 similar devices have buggy DNS servers - if the AAAA query arrives too

    11 quickly after the A query, the server will generate only a single reply

    12 with the A query id but returning an error for the AAAA query; we get

    13 stuck waiting for the second reply.

    14 

    15 For gethostbyname4() users affected, disabling IPv6 in the system might

    16 work around the issue, unfortunately it only helps with applications

    17 using AI_ADDRCONFIG (e.g. Firefox); some (notably e.g. Pidgin) neglect

    18 to do that.

    19 

    20 Real fix should be using separate ports for the A and AAAA queries.

    21 

    22 -= END original header =-

    23 

    24 diff -durN glibc-2_9.orig/resolv/Versions glibc-2_9/resolv/Versions

    25 --- glibc-2_9.orig/resolv/Versions	2008-08-01 19:15:34.000000000 +0200

    26 +++ glibc-2_9/resolv/Versions	2009-02-02 22:00:46.000000000 +0100

    27 @@ -102,7 +102,7 @@

    28      _nss_dns_gethostbyname_r; _nss_dns_getnetbyaddr_r;

    29      _nss_dns_getnetbyname_r; _nss_dns_getcanonname_r;

    30      _nss_dns_gethostbyaddr2_r;

    31 -    _nss_dns_gethostbyname4_r;

    32 +#    _nss_dns_gethostbyname4_r;

    33    }

    34  }

    35
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