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-rw-r--r--src/resolve/resolved-dns-server.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-server.c b/src/resolve/resolved-dns-server.c
index bcbfa69aff..7226111c07 100644
--- a/src/resolve/resolved-dns-server.c
+++ b/src/resolve/resolved-dns-server.c
@@ -21,6 +21,7 @@
#include "alloc-util.h"
#include "resolved-dns-server.h"
+#include "resolved-dns-stub.h"
#include "resolved-resolv-conf.h"
#include "siphash24.h"
#include "string-table.h"
@@ -750,6 +751,19 @@ void manager_next_dns_server(Manager *m) {
manager_set_dns_server(m, m->dns_servers);
}
+bool dns_server_address_valid(int family, const union in_addr_union *sa) {
+
+ /* Refuses the 0 IP addresses as well as 127.0.0.53 (which is our own DNS stub) */
+
+ if (in_addr_is_null(family, sa))
+ return false;
+
+ if (family == AF_INET && sa->in.s_addr == htobe32(INADDR_DNS_STUB))
+ return false;
+
+ return true;
+}
+
static const char* const dns_server_type_table[_DNS_SERVER_TYPE_MAX] = {
[DNS_SERVER_SYSTEM] = "system",
[DNS_SERVER_FALLBACK] = "fallback",