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From 6e5117b83af5998359916f276a9b32f755c0e6f4 Mon Sep 17 00:00:00 2001
From: Jan Synacek <jsynacek@redhat.com>
Date: Fri, 20 May 2016 12:33:48 +0200
Subject: [PATCH] myhostname: fix timeout if ipv6 is disabled
rhel-only
Resolves: #1330973
---
src/nss-myhostname/nss-myhostname.c | 9 +++++++--
src/shared/socket-util.c | 10 ++++++++++
2 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/src/nss-myhostname/nss-myhostname.c b/src/nss-myhostname/nss-myhostname.c
index a939bb267..e197cc752 100644
--- a/src/nss-myhostname/nss-myhostname.c
+++ b/src/nss-myhostname/nss-myhostname.c
@@ -33,6 +33,7 @@
#include "local-addresses.h"
#include "macro.h"
#include "nss-util.h"
+#include "socket-util.h"
#include "util.h"
/* We use 127.0.0.2 as IPv4 address. This has the advantage over
@@ -380,9 +381,13 @@ enum nss_status _nss_myhostname_gethostbyname3_r(
return NSS_STATUS_NOTFOUND;
}
- n_addresses = local_addresses(NULL, 0, af, &addresses);
- if (n_addresses < 0)
+ if (af == AF_INET6 && !socket_ipv6_is_supported()) {
n_addresses = 0;
+ } else {
+ n_addresses = local_addresses(NULL, 0, af, &addresses);
+ if (n_addresses < 0)
+ n_addresses = 0;
+ }
canonical = hn;
additional = n_addresses <= 0 && af == AF_INET6 ? "localhost" : NULL;
diff --git a/src/shared/socket-util.c b/src/shared/socket-util.c
index a21251014..79d1582d4 100644
--- a/src/shared/socket-util.c
+++ b/src/shared/socket-util.c
@@ -435,6 +435,16 @@ bool socket_ipv6_is_supported(void) {
return true;
/* If module was loaded with disable=1 no IPv6 available */
+ if (l[0] == '1')
+ return false;
+
+ free(l);
+ l = NULL;
+
+ if (read_one_line_file("/proc/sys/net/ipv6/conf/all/disable_ipv6", &l) < 0)
+ return true;
+
+ /* If IPv6 was disabled via sysctl during runtime */
return l[0] == '0';
}