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Bug 1908334

Summary:	gnutls-serv doesn't listen on IPvN loopback addresses if there are no IPvN external addresses configured
Product:	Red Hat Enterprise Linux 8	Reporter:	Alexander Sosedkin <asosedki>
Component:	gnutls	Assignee:	Daiki Ueno <dueno>
Status:	VERIFIED ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	low
Version:	8.5	CC:	dapospis, fweimer, hkario
Target Milestone:	rc	Keywords:	Triaged
Target Release:	8.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	gnutls-3.6.16-1.el8	Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1956783
Bug Blocks:	1903942

Description Alexander Sosedkin 2020-12-16 12:55:32 UTC

Description of problem:
  gnutls-serv doesn't listen on IPv4/IPv6 loopback addresses in case there are no IPv4/IPv6 (resp.) external addresses configured.

Version-Release number of selected component (if applicable): gnutls-3.6.14-6.el8.x86_64
How reproducible: always

Steps to Reproduce (IPv6, same works for IPv4):
  1. `ip a del` all your IPv6 addresses
  2. gnutls-serv

Actual results:
  HTTP Server listening on IPv4 0.0.0.0 port 5556...done

Expected results:
  HTTP Server listening on IPv4 0.0.0.0 port 5556...done
  HTTP Server listening on IPv6 :: port 5556...done

Additional info:
  This is a downstream request for https://gitlab.com/gnutls/gnutls/-/issues/1007, which demonstrates the IPv4 case in the wild.
  IPv6 socket bound to `::` would've dual-stacked if not for the IPV6_V6ONLY.
  Personally, I like binding to `::` w/o IPV6_V6ONLY or the patch in https://gitlab.com/gnutls/gnutls/-/issues/1007#note_356637206.

Comment 2 Alexander Sosedkin 2020-12-16 13:03:00 UTC

bz1908036 is a sister bug for openssl (same issue, also caused by AI_ADDRCONFIG application).

Comment 3 Florian Weimer 2020-12-18 16:17:20 UTC

Beniamino asked for a NetworkManager bug regarding the underlying issue, so I filed 1909213.

Comment 4 Daiki Ueno 2021-05-14 14:18:11 UTC

Fixed upstream in:
https://gitlab.com/gnutls/gnutls/-/merge_requests/1433