[LU-18976] Correctly reports DNS resolution failures in lsvcgssd

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.17.0
• Severity: 3
• Assignee: Aurelien Degremont
• Reporter: Aurelien Degremont

Description

When a DNS resolution fails, this is not reported as an error by lsvcgssd (it returns the IP address instead), but this is causing another error later, returning a strange error message.

Use proper NI_NAMEREQD flag with getnameinfo() in lsvcgssd when resolving IP addresses, for it to return an error if DNS resolution fails.