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From 6e5117b83af5998359916f276a9b32f755c0e6f4 Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Fri, 20 May 2016 12:33:48 +0200
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Subject: [PATCH] myhostname: fix timeout if ipv6 is disabled
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rhel-only
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Resolves: #1330973
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---
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src/nss-myhostname/nss-myhostname.c | 9 +++++++--
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src/shared/socket-util.c | 10 ++++++++++
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2 files changed, 17 insertions(+), 2 deletions(-)
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diff --git a/src/nss-myhostname/nss-myhostname.c b/src/nss-myhostname/nss-myhostname.c
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index a939bb2..e197cc7 100644
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--- a/src/nss-myhostname/nss-myhostname.c
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+++ b/src/nss-myhostname/nss-myhostname.c
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@@ -33,6 +33,7 @@
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#include "local-addresses.h"
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#include "macro.h"
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#include "nss-util.h"
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+#include "socket-util.h"
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#include "util.h"
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/* We use 127.0.0.2 as IPv4 address. This has the advantage over
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@@ -380,9 +381,13 @@ enum nss_status _nss_myhostname_gethostbyname3_r(
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return NSS_STATUS_NOTFOUND;
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}
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- n_addresses = local_addresses(NULL, 0, af, &addresses);
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- if (n_addresses < 0)
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+ if (af == AF_INET6 && !socket_ipv6_is_supported()) {
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n_addresses = 0;
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+ } else {
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+ n_addresses = local_addresses(NULL, 0, af, &addresses);
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+ if (n_addresses < 0)
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+ n_addresses = 0;
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+ }
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canonical = hn;
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additional = n_addresses <= 0 && af == AF_INET6 ? "localhost" : NULL;
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diff --git a/src/shared/socket-util.c b/src/shared/socket-util.c
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index a212510..79d1582 100644
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--- a/src/shared/socket-util.c
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+++ b/src/shared/socket-util.c
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@@ -435,6 +435,16 @@ bool socket_ipv6_is_supported(void) {
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return true;
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/* If module was loaded with disable=1 no IPv6 available */
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+ if (l[0] == '1')
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+ return false;
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+
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+ free(l);
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+ l = NULL;
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+
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+ if (read_one_line_file("/proc/sys/net/ipv6/conf/all/disable_ipv6", &l) < 0)
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+ return true;
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+
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+ /* If IPv6 was disabled via sysctl during runtime */
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return l[0] == '0';
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}
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