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NetworkManager/0001-rh1116999-resolv-conf-symlink.patch

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dns: manage resolv.conf as symlink to private file in /run directory (rh #1116999)
2015-01-21 12:36:56 +00:00
From 7e6aee7e1a898e552a0e273ef53ecf6a1f0e95d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pavel=20=C5=A0imerda?= <psimerda@redhat.com>
Date: Tue, 18 Nov 2014 18:12:16 +0100
Subject: [PATCH 1/3] dns-manager: make /etc/resolv.conf a symlink to
/run/NetworkManager/resolv.conf.default
Related:
* https://bugzilla.gnome.org/show_bug.cgi?id=732941
* https://bugzilla.redhat.com/show_bug.cgi?id=1116999
Acked-By: Thomas Haller <thaller@redhat.com>
Acked-By: Dan Williams <dcbw@redhat.com>
(cherry picked from commit 4805be2ed27b71a6099477d86dbc109adb41b819)
---
src/dns-manager/nm-dns-manager.c | 111 ++++++++++++++++++++-------------------
1 file changed, 57 insertions(+), 54 deletions(-)
diff --git a/src/dns-manager/nm-dns-manager.c b/src/dns-manager/nm-dns-manager.c
index d556850..5eeae9b 100644
--- a/src/dns-manager/nm-dns-manager.c
+++ b/src/dns-manager/nm-dns-manager.c
@@ -444,53 +444,27 @@ dispatch_resolvconf (char **searches,
}
#endif
+#define MY_RESOLV_CONF NMRUNDIR "/resolv.conf"
+#define MY_RESOLV_CONF_TMP MY_RESOLV_CONF ".tmp"
+#define RESOLV_CONF_TMP "/etc/.resolv.conf.NetworkManager"
+
static gboolean
update_resolv_conf (char **searches,
char **nameservers,
GError **error)
{
- char *tmp_resolv_conf;
- char *tmp_resolv_conf_realpath;
- char *resolv_conf_realpath;
FILE *f;
- int do_rename = 1;
- int old_errno = 0;
g_return_val_if_fail (error != NULL, FALSE);
- /* Find the real path of resolv.conf; it could be a symlink to something */
- resolv_conf_realpath = realpath (_PATH_RESCONF, NULL);
- if (!resolv_conf_realpath)
- resolv_conf_realpath = strdup (_PATH_RESCONF);
-
- /* Build up the real path for the temp resolv.conf that we're about to
- * write out.
- */
- tmp_resolv_conf = g_strdup_printf ("%s.tmp", resolv_conf_realpath);
- tmp_resolv_conf_realpath = realpath (tmp_resolv_conf, NULL);
- if (!tmp_resolv_conf_realpath)
- tmp_resolv_conf_realpath = strdup (tmp_resolv_conf);
- g_free (tmp_resolv_conf);
- tmp_resolv_conf = NULL;
-
- if ((f = fopen (tmp_resolv_conf_realpath, "w")) == NULL) {
- do_rename = 0;
- old_errno = errno;
- if ((f = fopen (_PATH_RESCONF, "w")) == NULL) {
- g_set_error (error,
- NM_MANAGER_ERROR,
- NM_MANAGER_ERROR_FAILED,
- "Could not open %s: %s\nCould not open %s: %s\n",
- tmp_resolv_conf_realpath,
- g_strerror (old_errno),
- _PATH_RESCONF,
- g_strerror (errno));
- goto out;
- }
- /* Update tmp_resolv_conf_realpath so the error message on fclose()
- * failure will be correct.
- */
- strcpy (tmp_resolv_conf_realpath, _PATH_RESCONF);
+ if ((f = fopen (MY_RESOLV_CONF_TMP, "w")) == NULL) {
+ g_set_error (error,
+ NM_MANAGER_ERROR,
+ NM_MANAGER_ERROR_FAILED,
+ "Could not open %s: %s\n",
+ MY_RESOLV_CONF_TMP,
+ g_strerror (errno));
+ return FALSE;
}
write_resolv_conf (f, searches, nameservers, error);
@@ -504,28 +478,57 @@ update_resolv_conf (char **searches,
NM_MANAGER_ERROR,
NM_MANAGER_ERROR_FAILED,
"Could not close %s: %s\n",
- tmp_resolv_conf_realpath,
+ MY_RESOLV_CONF_TMP,
g_strerror (errno));
}
}
- /* Don't rename the tempfile over top of the existing resolv.conf if there
- * was an error writing it out.
- */
- if (*error == NULL && do_rename) {
- if (rename (tmp_resolv_conf_realpath, resolv_conf_realpath) < 0) {
- g_set_error (error,
- NM_MANAGER_ERROR,
- NM_MANAGER_ERROR_FAILED,
- "Could not replace " _PATH_RESCONF ": %s\n",
- g_strerror (errno));
- }
+ if (*error)
+ return FALSE;
+
+ if (rename (MY_RESOLV_CONF_TMP, MY_RESOLV_CONF) < 0) {
+ g_set_error (error,
+ NM_MANAGER_ERROR,
+ NM_MANAGER_ERROR_FAILED,
+ "Could not replace %s: %s\n",
+ MY_RESOLV_CONF,
+ g_strerror (errno));
+ return FALSE;
+ }
+
+ if (unlink (RESOLV_CONF_TMP) == -1 && errno != ENOENT) {
+ g_set_error (error,
+ NM_MANAGER_ERROR,
+ NM_MANAGER_ERROR_FAILED,
+ "Could not unlink %s: %s\n",
+ RESOLV_CONF_TMP,
+ g_strerror (errno));
+ return FALSE;
+ }
+
+ if (symlink (MY_RESOLV_CONF, RESOLV_CONF_TMP) == -1) {
+ g_set_error (error,
+ NM_MANAGER_ERROR,
+ NM_MANAGER_ERROR_FAILED,
+ "Could not create symlink %s pointing to %s: %s\n",
+ RESOLV_CONF_TMP,
+ MY_RESOLV_CONF,
+ g_strerror (errno));
+ return FALSE;
+ }
+
+ if (rename (RESOLV_CONF_TMP, _PATH_RESCONF) == -1) {
+ g_set_error (error,
+ NM_MANAGER_ERROR,
+ NM_MANAGER_ERROR_FAILED,
+ "Could not rename %s to %s: %s\n",
+ RESOLV_CONF_TMP,
+ _PATH_RESCONF,
+ g_strerror (errno));
+ return FALSE;
}
-out:
- free (tmp_resolv_conf_realpath);
- free (resolv_conf_realpath);
- return *error ? FALSE : TRUE;
+ return TRUE;
}
static void
--
1.9.3
From 20983e28f4fff52f75327b30cc7d386ebfda2710 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pavel=20=C5=A0imerda?= <psimerda@redhat.com>
Date: Tue, 18 Nov 2014 18:12:16 +0100
Subject: [PATCH 2/3] dns-manager: don't replace /etc/resolv.conf installed by
other tools
Resolves:
* https://bugzilla.gnome.org/show_bug.cgi?id=732941
* https://bugzilla.redhat.com/show_bug.cgi?id=1116999
Acked-By: Dan Williams <dcbw@redhat.com>
Acked-By: Thomas Haller <thaller@redhat.com>
(cherry picked from commit 583568e12f9e580cd2903811637c9f9b7a2f1088)
---
src/dns-manager/nm-dns-manager.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/src/dns-manager/nm-dns-manager.c b/src/dns-manager/nm-dns-manager.c
index 5eeae9b..e9d3f43 100644
--- a/src/dns-manager/nm-dns-manager.c
+++ b/src/dns-manager/nm-dns-manager.c
@@ -27,6 +27,7 @@
#include <fcntl.h>
#include <resolv.h>
#include <stdlib.h>
+#include <sys/stat.h>
#include <sys/ioctl.h>
#include <unistd.h>
@@ -454,6 +455,7 @@ update_resolv_conf (char **searches,
GError **error)
{
FILE *f;
+ struct stat st;
g_return_val_if_fail (error != NULL, FALSE);
@@ -496,6 +498,39 @@ update_resolv_conf (char **searches,
return FALSE;
}
+ /* Don't overwrite a symbolic link unless it points to MY_RESOLV_CONF. */
+ if (lstat (_PATH_RESCONF, &st) != -1) {
+ /* Don't overwrite a symbolic link. */
+ if (S_ISLNK (st.st_mode)) {
+ if (stat (_PATH_RESCONF, &st) != -1) {
+ char *path = g_file_read_link (_PATH_RESCONF, NULL);
+ gboolean not_ours = g_strcmp0 (path, MY_RESOLV_CONF) != 0;
+
+ g_free (path);
+ if (not_ours)
+ return TRUE;
+ } else {
+ if (errno != ENOENT)
+ return TRUE;
+ g_set_error (error,
+ NM_MANAGER_ERROR,
+ NM_MANAGER_ERROR_FAILED,
+ "Could not stat %s: %s\n",
+ _PATH_RESCONF,
+ g_strerror (errno));
+ return FALSE;
+ }
+ }
+ } else if (errno != ENOENT) {
+ g_set_error (error,
+ NM_MANAGER_ERROR,
+ NM_MANAGER_ERROR_FAILED,
+ "Could not lstat %s: %s\n",
+ _PATH_RESCONF,
+ g_strerror (errno));
+ return FALSE;
+ }
+
if (unlink (RESOLV_CONF_TMP) == -1 && errno != ENOENT) {
g_set_error (error,
NM_MANAGER_ERROR,
--
1.9.3
From 9c3b052d010a124b32319b79be9006ae5dccac6d Mon Sep 17 00:00:00 2001
From: Thomas Haller <thaller@redhat.com>
Date: Wed, 21 Jan 2015 17:29:10 +0100
Subject: [PATCH 3/3] trival/whitespace: fix indention in nm-dns-manager.c
Fixes: 583568e12f9e580cd2903811637c9f9b7a2f1088
(cherry picked from commit 4c691cf69ed33bcbaa0b4802e419b98ed687630b)
---
src/dns-manager/nm-dns-manager.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/src/dns-manager/nm-dns-manager.c b/src/dns-manager/nm-dns-manager.c
index e9d3f43..6f34584 100644
--- a/src/dns-manager/nm-dns-manager.c
+++ b/src/dns-manager/nm-dns-manager.c
@@ -513,11 +513,11 @@ update_resolv_conf (char **searches,
if (errno != ENOENT)
return TRUE;
g_set_error (error,
- NM_MANAGER_ERROR,
- NM_MANAGER_ERROR_FAILED,
- "Could not stat %s: %s\n",
- _PATH_RESCONF,
- g_strerror (errno));
+ NM_MANAGER_ERROR,
+ NM_MANAGER_ERROR_FAILED,
+ "Could not stat %s: %s\n",
+ _PATH_RESCONF,
+ g_strerror (errno));
return FALSE;
}
}
--
1.9.3
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