resolved: maintain order when writing resolv.conf entries
http://lists.freedesktop.org/archives/systemd-devel/2015-March/029850.html
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4a280a7e78
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@ -30,6 +30,7 @@
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#include "af-list.h"
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#include "utf8.h"
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#include "fileio-label.h"
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#include "ordered-set.h"
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#include "resolved-dns-domain.h"
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#include "resolved-conf.h"
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@ -702,8 +703,11 @@ static void write_resolv_conf_server(DnsServer *s, FILE *f, unsigned *count) {
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(*count) ++;
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}
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static void write_resolv_conf_search(const char *domain, FILE *f,
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unsigned *count, unsigned *length) {
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static void write_resolv_conf_search(
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const char *domain, FILE *f,
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unsigned *count,
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unsigned *length) {
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assert(domain);
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assert(f);
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assert(length);
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@ -724,7 +728,7 @@ static void write_resolv_conf_search(const char *domain, FILE *f,
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(*count) ++;
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}
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static int write_resolv_conf_contents(FILE *f, Set *dns, Set *domains) {
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static int write_resolv_conf_contents(FILE *f, OrderedSet *dns, OrderedSet *domains) {
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Iterator i;
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fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n"
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@ -733,22 +737,22 @@ static int write_resolv_conf_contents(FILE *f, Set *dns, Set *domains) {
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"# resolv.conf(5) in a different way, replace the symlink by a\n"
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"# static file or a different symlink.\n\n", f);
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if (set_isempty(dns))
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if (ordered_set_isempty(dns))
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fputs("# No DNS servers known.\n", f);
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else {
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DnsServer *s;
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unsigned count = 0;
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SET_FOREACH(s, dns, i)
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ORDERED_SET_FOREACH(s, dns, i)
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write_resolv_conf_server(s, f, &count);
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}
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if (!set_isempty(domains)) {
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if (!ordered_set_isempty(domains)) {
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unsigned length = 0, count = 0;
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char *domain;
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fputs("search", f);
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SET_FOREACH(domain, domains, i)
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ORDERED_SET_FOREACH(domain, domains, i)
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write_resolv_conf_search(domain, f, &count, &length);
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fputs("\n", f);
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}
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@ -756,12 +760,11 @@ static int write_resolv_conf_contents(FILE *f, Set *dns, Set *domains) {
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return fflush_and_check(f);
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}
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int manager_write_resolv_conf(Manager *m) {
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static const char path[] = "/run/systemd/resolve/resolv.conf";
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_cleanup_free_ char *temp_path = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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_cleanup_set_free_ Set *dns = NULL, *domains = NULL;
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_cleanup_ordered_set_free_ OrderedSet *dns = NULL, *domains = NULL;
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DnsServer *s;
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Iterator i;
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Link *l;
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@ -773,17 +776,17 @@ int manager_write_resolv_conf(Manager *m) {
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manager_read_resolv_conf(m);
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/* Add the full list to a set, to filter out duplicates */
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dns = set_new(&dns_server_hash_ops);
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dns = ordered_set_new(&dns_server_hash_ops);
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if (!dns)
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return -ENOMEM;
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domains = set_new(&dns_name_hash_ops);
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domains = ordered_set_new(&dns_name_hash_ops);
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if (!domains)
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return -ENOMEM;
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/* First add the system-wide servers */
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LIST_FOREACH(servers, s, m->dns_servers) {
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r = set_put(dns, s);
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r = ordered_set_put(dns, s);
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if (r == -EEXIST)
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continue;
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if (r < 0)
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@ -795,7 +798,7 @@ int manager_write_resolv_conf(Manager *m) {
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char **domain;
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LIST_FOREACH(servers, s, l->dns_servers) {
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r = set_put(dns, s);
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r = ordered_set_put(dns, s);
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if (r == -EEXIST)
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continue;
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if (r < 0)
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@ -806,7 +809,7 @@ int manager_write_resolv_conf(Manager *m) {
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continue;
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STRV_FOREACH(domain, l->unicast_scope->domains) {
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r = set_put(domains, *domain);
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r = ordered_set_put(domains, *domain);
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if (r == -EEXIST)
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continue;
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if (r < 0)
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@ -815,9 +818,9 @@ int manager_write_resolv_conf(Manager *m) {
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}
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/* If we found nothing, add the fallback servers */
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if (set_isempty(dns)) {
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if (ordered_set_isempty(dns)) {
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LIST_FOREACH(servers, s, m->fallback_dns_servers) {
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r = set_put(dns, s);
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r = ordered_set_put(dns, s);
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if (r == -EEXIST)
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continue;
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if (r < 0)
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@ -843,8 +846,8 @@ int manager_write_resolv_conf(Manager *m) {
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return 0;
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fail:
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unlink(path);
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unlink(temp_path);
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(void) unlink(path);
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(void) unlink(temp_path);
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return r;
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}
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