gentoo-overlay/app-crypt/gnupg/files/gnupg-2.2.4-dirmngr-Handle-failures-related-to-missing-IPv6.patch

From b7f48a0095a5b010b94f8192f4adc1adf8697567 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
Date: Wed, 31 Jan 2018 16:57:19 +0100
Subject: [PATCH] dirmngr: Handle failures related to missing IPv6 gracefully

Handle the two possible connect failures related to missing IPv6 support
gracefully by marking the host dead and retrying with another one.
If IPv6 is disabled via procfs, connect() will return EADDRNOTAVAIL.
If IPv6 is not compiled into the kernel, it will return EAFNOSUPPORT.
This makes it possible to use dual-stack hkp servers on hosts not having
IPv6 without random connection failures.
---
 dirmngr/ks-engine-hkp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dirmngr/ks-engine-hkp.c b/dirmngr/ks-engine-hkp.c
index 4a0b08f4f..a9bb93666 100644
--- a/dirmngr/ks-engine-hkp.c
+++ b/dirmngr/ks-engine-hkp.c
@@ -1353,6 +1353,8 @@ handle_send_request_error (ctrl_t ctrl, gpg_error_t err, const char *request,
     case GPG_ERR_UNKNOWN_HOST:
     case GPG_ERR_NETWORK:
     case GPG_ERR_EIO:  /* Sometimes used by estream cookie functions.  */
+    case GPG_ERR_EADDRNOTAVAIL:  /* e.g. when IPv6 is disabled */
+    case GPG_ERR_EAFNOSUPPORT:  /* e.g. when IPv6 is not compiled in */
       if (mark_host_dead (request) && *tries_left)
         retry = 1;
       break;
-- 
2.16.1