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getifaddrs computes &ctx->first->ifa even if ctx->first is NULL. While
this shouldn't be possible on the success path because the loopback
interface is hardcoded into the kernel, this is still possible on the
error path (for example, if __rtnetlink_enumerate couldn't create a
socket due to exceeding the fd limit).
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With point-to-point interfaces, the IFA_ADDRESS netlink attribute
contains the peer address while an extra attribute IFA_LOCAL carries
the actual local interface address.
Both the glibc and uclibc implementations of getifaddrs() handle this
case by moving the ifa_addr contents to the broadcast/remote address
union and overwriting ifa_addr upon receipt of an IFA_LOCAL attribute.
This patch adds the same special treatment logic of IFA_LOCAL to
musl's implementation of getifaddrs() in order to align its behaviour
with that of uclibc and glibc.
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
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the previous implementations had several deficiencies, the most severe
of which was the inability to report unconfigured interfaces or
interfaces without ipv4 addresses. among the options discussed for
fixing this, using netlink turned out to be the one with the least
cost and most additional advantages. other improvements include:
if_nameindex now avoids duplicates in the list it produces, but still
includes legacy-style interface aliases if any are in use.
getifaddrs now reports hardware addresses and includes the scope_id
for link-local ipv6 addresses in the resulting address.
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supports ipv4 and ipv6, but not the "extended" usage where
usage statistics and other info are assigned to ifa_data members
of duplicate entries with AF_PACKET family.
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