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authorBaptiste Jonglez <git@bitsofnetworks.org>2021-05-13 19:50:22 +0200
committerBaptiste Jonglez <git@bitsofnetworks.org>2021-05-14 15:56:20 +0200
commit7fea9d9f5dd282a7049d77cc6b75e0a703ead26c (patch)
treec48c181d8e3cc99bd362f8da6b47c7cde57d67bc /package/utils/busybox/Config-defaults.in
parentd337731f85c880acc96e8a6b99b62aeb57b8253f (diff)
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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>
Diffstat (limited to 'package/utils/busybox/Config-defaults.in')
-rw-r--r--package/utils/busybox/Config-defaults.in2
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