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| author | Baptiste Jonglez <git@bitsofnetworks.org> | 2021-05-13 19:50:22 +0200 |
|---|---|---|
| committer | Baptiste Jonglez <git@bitsofnetworks.org> | 2021-05-14 15:56:20 +0200 |
| commit | 7fea9d9f5dd282a7049d77cc6b75e0a703ead26c (patch) | |
| tree | c48c181d8e3cc99bd362f8da6b47c7cde57d67bc | |
| parent | d337731f85c880acc96e8a6b99b62aeb57b8253f (diff) | |
| download | upstream-7fea9d9f5dd282a7049d77cc6b75e0a703ead26c.tar.gz upstream-7fea9d9f5dd282a7049d77cc6b75e0a703ead26c.tar.bz2 upstream-7fea9d9f5dd282a7049d77cc6b75e0a703ead26c.zip | |
busybox: disable PREFER_IPV4_ADDRESS
PREFER_IPV4_ADDRESS is broken on IPv6-only hosts, as it causes busybox
utilities (ping, traceroute, ntpd) to forcibly use the A record instead of
the AAAA record when resolving a DNS name. This obviously fails when
there is no IPv4 connectivity. Since IPv6-only hosts or routers will only
become more common over time, disable PREFER_IPV4_ADDRESS to support this
use-case.
As a side-effect, disabling PREFER_IPV4_ADDRESS changes the default
resolution behaviour of busybox utilities on dual-stack hosts. Busybox
utilities now simply use the order given by getaddrinfo(), so they will
now prefer IPv6 addresses when resolving a name with both A and AAAA
records if there is IPv6 connectivity. This is in line with RFC 6724.
PREFER_IPV4_ADDRESS was likely intended to work around naive
implementations of getaddrinfo() that could return AAAA records first,
even on an IPv4-only host. But both musl (since 1.1.3) and glibc
correctly implement RFC 6724 for getaddrinfo() and check connectivity to
determine the correct order in which to return records. On IPv4-only
hosts, getaddrinfo() will return A records first, so there is no need for
the PREFER_IPV4_ADDRESS hack.
See also: https://bugs.busybox.net/show_bug.cgi?id=12381
Fixes: FS#84
Fixes: FS#2608
References: https://github.com/openwrt/openwrt/pull/4167
Signed-off-by: Alexander Traud <pabstraud@compuserve.com>
Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org>
| -rw-r--r-- | package/utils/busybox/Config-defaults.in | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/package/utils/busybox/Config-defaults.in b/package/utils/busybox/Config-defaults.in index 04148df267..168c73b24c 100644 --- a/package/utils/busybox/Config-defaults.in +++ b/package/utils/busybox/Config-defaults.in @@ -2192,7 +2192,7 @@ config BUSYBOX_DEFAULT_FEATURE_UNIX_LOCAL default n config BUSYBOX_DEFAULT_FEATURE_PREFER_IPV4_ADDRESS bool - default y + default n config BUSYBOX_DEFAULT_VERBOSE_RESOLUTION_ERRORS bool default y |