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authorLennart Poettering <lennart@poettering.net>2015-04-08 17:23:27 +0200
committerLennart Poettering <lennart@poettering.net>2015-04-08 17:23:27 +0200
commit822db23cfa98a9fbc48f41e11caafb6f1017e052 (patch)
treed1a11c5661cf0d89f34c183a130de73526b79202
parent4a280a7e78e633bd57cd1d5e6333d8fa29906e42 (diff)
resolved: maintain order when writing resolv.conf entries
http://lists.freedesktop.org/archives/systemd-devel/2015-March/029850.html
-rw-r--r--src/resolve/resolved-manager.c39
1 files changed, 21 insertions, 18 deletions
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index 167bea39b..adaa6c6e7 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -30,6 +30,7 @@
#include "af-list.h"
#include "utf8.h"
#include "fileio-label.h"
+#include "ordered-set.h"
#include "resolved-dns-domain.h"
#include "resolved-conf.h"
@@ -702,8 +703,11 @@ static void write_resolv_conf_server(DnsServer *s, FILE *f, unsigned *count) {
(*count) ++;
}
-static void write_resolv_conf_search(const char *domain, FILE *f,
- unsigned *count, unsigned *length) {
+static void write_resolv_conf_search(
+ const char *domain, FILE *f,
+ unsigned *count,
+ unsigned *length) {
+
assert(domain);
assert(f);
assert(length);
@@ -724,7 +728,7 @@ static void write_resolv_conf_search(const char *domain, FILE *f,
(*count) ++;
}
-static int write_resolv_conf_contents(FILE *f, Set *dns, Set *domains) {
+static int write_resolv_conf_contents(FILE *f, OrderedSet *dns, OrderedSet *domains) {
Iterator i;
fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n"
@@ -733,22 +737,22 @@ static int write_resolv_conf_contents(FILE *f, Set *dns, Set *domains) {
"# resolv.conf(5) in a different way, replace the symlink by a\n"
"# static file or a different symlink.\n\n", f);
- if (set_isempty(dns))
+ if (ordered_set_isempty(dns))
fputs("# No DNS servers known.\n", f);
else {
DnsServer *s;
unsigned count = 0;
- SET_FOREACH(s, dns, i)
+ ORDERED_SET_FOREACH(s, dns, i)
write_resolv_conf_server(s, f, &count);
}
- if (!set_isempty(domains)) {
+ if (!ordered_set_isempty(domains)) {
unsigned length = 0, count = 0;
char *domain;
fputs("search", f);
- SET_FOREACH(domain, domains, i)
+ ORDERED_SET_FOREACH(domain, domains, i)
write_resolv_conf_search(domain, f, &count, &length);
fputs("\n", f);
}
@@ -756,12 +760,11 @@ static int write_resolv_conf_contents(FILE *f, Set *dns, Set *domains) {
return fflush_and_check(f);
}
-
int manager_write_resolv_conf(Manager *m) {
static const char path[] = "/run/systemd/resolve/resolv.conf";
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
- _cleanup_set_free_ Set *dns = NULL, *domains = NULL;
+ _cleanup_ordered_set_free_ OrderedSet *dns = NULL, *domains = NULL;
DnsServer *s;
Iterator i;
Link *l;
@@ -773,17 +776,17 @@ int manager_write_resolv_conf(Manager *m) {
manager_read_resolv_conf(m);
/* Add the full list to a set, to filter out duplicates */
- dns = set_new(&dns_server_hash_ops);
+ dns = ordered_set_new(&dns_server_hash_ops);
if (!dns)
return -ENOMEM;
- domains = set_new(&dns_name_hash_ops);
+ domains = ordered_set_new(&dns_name_hash_ops);
if (!domains)
return -ENOMEM;
/* First add the system-wide servers */
LIST_FOREACH(servers, s, m->dns_servers) {
- r = set_put(dns, s);
+ r = ordered_set_put(dns, s);
if (r == -EEXIST)
continue;
if (r < 0)
@@ -795,7 +798,7 @@ int manager_write_resolv_conf(Manager *m) {
char **domain;
LIST_FOREACH(servers, s, l->dns_servers) {
- r = set_put(dns, s);
+ r = ordered_set_put(dns, s);
if (r == -EEXIST)
continue;
if (r < 0)
@@ -806,7 +809,7 @@ int manager_write_resolv_conf(Manager *m) {
continue;
STRV_FOREACH(domain, l->unicast_scope->domains) {
- r = set_put(domains, *domain);
+ r = ordered_set_put(domains, *domain);
if (r == -EEXIST)
continue;
if (r < 0)
@@ -815,9 +818,9 @@ int manager_write_resolv_conf(Manager *m) {
}
/* If we found nothing, add the fallback servers */
- if (set_isempty(dns)) {
+ if (ordered_set_isempty(dns)) {
LIST_FOREACH(servers, s, m->fallback_dns_servers) {
- r = set_put(dns, s);
+ r = ordered_set_put(dns, s);
if (r == -EEXIST)
continue;
if (r < 0)
@@ -843,8 +846,8 @@ int manager_write_resolv_conf(Manager *m) {
return 0;
fail:
- unlink(path);
- unlink(temp_path);
+ (void) unlink(path);
+ (void) unlink(temp_path);
return r;
}