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getaddrinfo: Properly set errno for NSS function lookup failure

This commit is contained in:
Florian Weimer 2017-09-01 08:57:28 +02:00
parent 53250a21b8
commit ad816a5e00
2 changed files with 15 additions and 6 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2017-09-01 Florian Weimer <fweimer@redhat.com>
* sysdeps/posix/getaddrinfo.c (gaih_inet): Make reporting of NSS
function lookup failures more reliable.
2017-09-01 Florian Weimer <fweimer@redhat.com>
* sysdeps/posix/getaddrinfo.c (gethosts): Use h_errno directly.

16
sysdeps/posix/getaddrinfo.c
View File

@ -922,13 +922,17 @@ gaih_inet (const char *name, const struct gaih_service *service,
}
else
{
/* Could not locate any of the lookup functions.
The NSS lookup code does not consistently set
errno, so we need to supply our own error
code here. The root cause could either be a
resource allocation failure, or a missing
service function in the DSO (so it should not
be listed in /etc/nsswitch.conf). Assume the
former, and return EBUSY. */
status = NSS_STATUS_UNAVAIL;
/* Could not load any of the lookup functions. Indicate
an internal error if the failure was due to a system
error other than the file not being found. We use the
errno from the last failed callback. */
if (errno != 0 && errno != ENOENT)
__set_h_errno (NETDB_INTERNAL);
__set_h_errno (NETDB_INTERNAL);
__set_errno (EBUSY);
}
}