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-rw-r--r--src/resolve/resolved-dns-server.c44
-rw-r--r--src/resolve/resolved-dns-server.h5
-rw-r--r--src/resolve/resolved-link.c23
-rw-r--r--src/resolve/resolved-manager.c32
4 files changed, 73 insertions, 31 deletions
diff --git a/src/resolve/resolved-dns-server.c b/src/resolve/resolved-dns-server.c
index 9a62a63258..92e48ae442 100644
--- a/src/resolve/resolved-dns-server.c
+++ b/src/resolve/resolved-dns-server.c
@@ -41,6 +41,7 @@ int dns_server_new(
if (!s)
return -ENOMEM;
+ s->n_ref = 1;
s->type = type;
s->family = family;
s->address = *in_addr;
@@ -74,33 +75,46 @@ int dns_server_new(
return 0;
}
-DnsServer* dns_server_free(DnsServer *s) {
+DnsServer* dns_server_ref(DnsServer *s) {
if (!s)
return NULL;
- if (s->link) {
- if (s->type == DNS_SERVER_LINK)
- LIST_REMOVE(servers, s->link->dns_servers, s);
+ assert(s->n_ref > 0);
- if (s->link->current_dns_server == s)
- link_set_dns_server(s->link, NULL);
- }
+ s->n_ref ++;
- if (s->manager) {
- if (s->type == DNS_SERVER_SYSTEM)
- LIST_REMOVE(servers, s->manager->dns_servers, s);
- else if (s->type == DNS_SERVER_FALLBACK)
- LIST_REMOVE(servers, s->manager->fallback_dns_servers, s);
+ return s;
+}
+
+static DnsServer* dns_server_free(DnsServer *s) {
+ if (!s)
+ return NULL;
- if (s->manager->current_dns_server == s)
- manager_set_dns_server(s->manager, NULL);
- }
+ if (s->link && s->link->current_dns_server == s)
+ link_set_dns_server(s->link, NULL);
+
+ if (s->manager && s->manager->current_dns_server == s)
+ manager_set_dns_server(s->manager, NULL);
free(s);
return NULL;
}
+DnsServer* dns_server_unref(DnsServer *s) {
+ if (!s)
+ return NULL;
+
+ assert(s->n_ref > 0);
+
+ if (s->n_ref == 1)
+ dns_server_free(s);
+ else
+ s->n_ref --;
+
+ return NULL;
+}
+
static unsigned long dns_server_hash_func(const void *p, const uint8_t hash_key[HASH_KEY_SIZE]) {
const DnsServer *s = p;
uint64_t u;
diff --git a/src/resolve/resolved-dns-server.h b/src/resolve/resolved-dns-server.h
index 70ff35b08f..03013beb82 100644
--- a/src/resolve/resolved-dns-server.h
+++ b/src/resolve/resolved-dns-server.h
@@ -37,6 +37,8 @@ typedef enum DnsServerType {
struct DnsServer {
Manager *manager;
+ unsigned n_ref;
+
DnsServerType type;
Link *link;
@@ -57,6 +59,7 @@ int dns_server_new(
int family,
const union in_addr_union *address);
-DnsServer* dns_server_free(DnsServer *s);
+DnsServer* dns_server_ref(DnsServer *s);
+DnsServer* dns_server_unref(DnsServer *s);
extern const struct hash_ops dns_server_hash_ops;
diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c
index ff8dc3a5bc..d66b3a88fc 100644
--- a/src/resolve/resolved-link.c
+++ b/src/resolve/resolved-link.c
@@ -58,7 +58,6 @@ int link_new(Manager *m, Link **ret, int ifindex) {
}
Link *link_free(Link *l) {
-
if (!l)
return NULL;
@@ -68,8 +67,12 @@ Link *link_free(Link *l) {
if (l->manager)
hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex));
- while (l->dns_servers)
- dns_server_free(l->dns_servers);
+ while (l->dns_servers) {
+ DnsServer *s = l->dns_servers;
+
+ LIST_REMOVE(servers, l->dns_servers, s);
+ dns_server_unref(s);
+ }
dns_scope_free(l->unicast_scope);
dns_scope_free(l->llmnr_ipv4_scope);
@@ -182,14 +185,20 @@ static int link_update_dns_servers(Link *l) {
}
LIST_FOREACH_SAFE(servers, s, nx, l->dns_servers)
- if (s->marked)
- dns_server_free(s);
+ if (s->marked) {
+ LIST_REMOVE(servers, l->dns_servers, s);
+ dns_server_unref(s);
+ }
return 0;
clear:
- while (l->dns_servers)
- dns_server_free(l->dns_servers);
+ while (l->dns_servers) {
+ s = l->dns_servers;
+
+ LIST_REMOVE(servers, l->dns_servers, s);
+ dns_server_unref(s);
+ }
return r;
}
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index 6785a2e3c7..e050092a12 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -603,8 +603,10 @@ int manager_read_resolv_conf(Manager *m) {
}
LIST_FOREACH_SAFE(servers, s, nx, m->dns_servers)
- if (s->marked)
- dns_server_free(s);
+ if (s->marked) {
+ LIST_REMOVE(servers, m->dns_servers, s);
+ dns_server_unref(s);
+ }
/* Whenever /etc/resolv.conf changes, start using the first
* DNS server of it. This is useful to deal with broken
@@ -619,8 +621,12 @@ int manager_read_resolv_conf(Manager *m) {
return 0;
clear:
- while (m->dns_servers)
- dns_server_free(m->dns_servers);
+ while (m->dns_servers) {
+ s = m->dns_servers;
+
+ LIST_REMOVE(servers, m->dns_servers, s);
+ dns_server_unref(s);
+ }
return r;
}
@@ -1381,15 +1387,25 @@ void manager_verify_all(Manager *m) {
}
void manager_flush_dns_servers(Manager *m, DnsServerType t) {
+ DnsServer *s;
+
assert(m);
if (t == DNS_SERVER_SYSTEM)
- while (m->dns_servers)
- dns_server_free(m->dns_servers);
+ while (m->dns_servers) {
+ s = m->dns_servers;
+
+ LIST_REMOVE(servers, m->dns_servers, s);
+ dns_server_unref(s);
+ }
if (t == DNS_SERVER_FALLBACK)
- while (m->fallback_dns_servers)
- dns_server_free(m->fallback_dns_servers);
+ while (m->fallback_dns_servers) {
+ s = m->fallback_dns_servers;
+
+ LIST_REMOVE(servers, m->fallback_dns_servers, s);
+ dns_server_unref(s);
+ }
}
static const char* const support_table[_SUPPORT_MAX] = {