dns: Move domain_is_routing and domain_is_valid functions

domain_is_routing and domain_is_valid functions could be used
outside of nm-dns-manager thus move them to core utils.

src/core/dns/nm-dns-manager.c

@@ -177,57 +177,6 @@ NM_DEFINE_SINGLETON_GETTER(NMDnsManager, nm_dns_manager_get, NM_TYPE_DNS_MANAGER
 
 /*****************************************************************************/
 
-static gboolean
-domain_is_valid(const char *domain,
-                gboolean    reject_public_suffix,
-                gboolean    assume_any_tld_is_public)
-{
-    if (*domain == '\0')
-        return FALSE;
-
-    if (reject_public_suffix) {
-        int is_pub;
-
-#if !WITH_LIBPSL
-        /* Without libpsl, we cannot detect that the domain is a public suffix, we assume
-         * the domain is not and valid. */
-        is_pub = FALSE;
-#elif defined(PSL_TYPE_NO_STAR_RULE)
-        /*
-         * If we use PSL_TYPE_ANY, any TLD (top-level domain, i.e., domain
-         * with no dots) is considered *public* by the PSL library even if
-         * it is *not* on the official suffix list. This is the implicit
-         * behavior of the older API function psl_is_public_suffix().
-         * To inhibit that and only deem TLDs explicitly listed in the PSL
-         * as public, we need to turn off the "prevailing star rule" with
-         * PSL_TYPE_NO_STAR_RULE.
-         * For documentation on psl_is_public_suffix2(), see:
-         * https://rockdaboot.github.io/libpsl/libpsl-Public-Suffix-List-functions.html#psl-is-public-suffix2
-         * For more on the public suffix format, including wildcards:
-         * https://github.com/publicsuffix/list/wiki/Format#format
-         */
-        is_pub =
-            psl_is_public_suffix2(psl_builtin(),
-                                  domain,
-                                  assume_any_tld_is_public ? PSL_TYPE_ANY : PSL_TYPE_NO_STAR_RULE);
-#else
-        is_pub = psl_is_public_suffix(psl_builtin(), domain);
-#endif
-
-        if (is_pub)
-            return FALSE;
-    }
-
-    return TRUE;
-}
-
-static gboolean
-domain_is_routing(const char *domain)
-{
-    return domain[0] == '~';
-}
-
-/*****************************************************************************/
 
 static NM_UTILS_LOOKUP_STR_DEFINE(
     _rc_manager_to_string,

src/core/nm-core-utils.c

@@ -26,6 +26,10 @@
 #include <netinet/ip6.h>
 #include <linux/if_packet.h>
 
+#if WITH_LIBPSL
+#include <libpsl.h>
+#endif
+
 #include "libnm-glib-aux/nm-uuid.h"
 #include "libnm-platform/nmp-base.h"
 #include "libnm-std-aux/unaligned.h"
@@ -4455,6 +4459,56 @@ nm_utils_parse_dns_domain(const char *domain, gboolean *is_routing)
     return domain;
 }
 
+inline gboolean
+nm_domain_is_routing(const char *domain)
+{
+    return domain[0] == '~';
+}
+
+gboolean
+nm_domain_is_valid(const char *domain,
+                   gboolean    reject_public_suffix,
+                   gboolean    assume_any_tld_is_public)
+{
+    if (*domain == '\0')
+        return FALSE;
+
+    if (reject_public_suffix) {
+        int is_pub;
+
+#if !WITH_LIBPSL
+        /* Without libpsl, we cannot detect that the domain is a public suffix, we assume
+         * the domain is not and valid. */
+        is_pub = FALSE;
+#elif defined(PSL_TYPE_NO_STAR_RULE)
+        /*
+         * If we use PSL_TYPE_ANY, any TLD (top-level domain, i.e., domain
+         * with no dots) is considered *public* by the PSL library even if
+         * it is *not* on the official suffix list. This is the implicit
+         * behavior of the older API function psl_is_public_suffix().
+         * To inhibit that and only deem TLDs explicitly listed in the PSL
+         * as public, we need to turn off the "prevailing star rule" with
+         * PSL_TYPE_NO_STAR_RULE.
+         * For documentation on psl_is_public_suffix2(), see:
+         * https://rockdaboot.github.io/libpsl/libpsl-Public-Suffix-List-functions.html#psl-is-public-suffix2
+         * For more on the public suffix format, including wildcards:
+         * https://github.com/publicsuffix/list/wiki/Format#format
+         */
+        is_pub =
+            psl_is_public_suffix2(psl_builtin(),
+                                  domain,
+                                  assume_any_tld_is_public ? PSL_TYPE_ANY : PSL_TYPE_NO_STAR_RULE);
+#else
+        is_pub = psl_is_public_suffix(psl_builtin(), domain);
+#endif
+
+        if (is_pub)
+            return FALSE;
+    }
+
+    return TRUE;
+}
+
 /*****************************************************************************/
 
 static guint32

src/core/nm-core-utils.h

@@ -457,6 +457,12 @@ const char *nm_activation_type_to_string(NMActivationType activation_type);
 
 const char *nm_utils_parse_dns_domain(const char *domain, gboolean *is_routing);
 
+gboolean nm_domain_is_routing(const char *domain);
+
+gboolean nm_domain_is_valid(const char *domain,
+                            gboolean    reject_public_suffix,
+                            gboolean    assume_any_tld_is_public);
+
 /*****************************************************************************/
 
 void nm_wifi_utils_parse_ies(const guint8 *bytes,