shared: add nm_ip4_addr_is_localhost() util

2 files changed, 20 insertions, 0 deletions

diff --git a/shared/nm-utils/nm-shared-utils.h b/shared/nm-utils/nm-shared-utils.h
index 4758c4a083..4d9f20d073 100644
--- a/shared/nm-utils/nm-shared-utils.h
+++ b/shared/nm-utils/nm-shared-utils.h
@@ -140,6 +140,12 @@ nm_ip_addr_set (int addr_family, gpointer dst, gconstpointer src)
 	          : sizeof (struct in6_addr));
 }
 
+static inline gboolean
+nm_ip4_addr_is_localhost (in_addr_t addr4)
+{
+	return (addr4 & htonl (0xFF000000u)) == htonl (0x7F000000u);
+}
+
 /*****************************************************************************/
 
 #define NM_CMP_RETURN(c) \
diff --git a/shared/nm-utils/tests/test-shared-general.c b/shared/nm-utils/tests/test-shared-general.c
index 7d22e56d99..b262757879 100644
--- a/shared/nm-utils/tests/test-shared-general.c
+++ b/shared/nm-utils/tests/test-shared-general.c
@@ -204,6 +204,19 @@ test_nm_strndup_a (void)
 
 /*****************************************************************************/
 
+static void
+test_nm_ip4_addr_is_localhost (void)
+{
+	g_assert ( nm_ip4_addr_is_localhost (nmtst_inet4_from_string ("127.0.0.0")));
+	g_assert ( nm_ip4_addr_is_localhost (nmtst_inet4_from_string ("127.0.0.1")));
+	g_assert ( nm_ip4_addr_is_localhost (nmtst_inet4_from_string ("127.5.0.1")));
+	g_assert (!nm_ip4_addr_is_localhost (nmtst_inet4_from_string ("126.5.0.1")));
+	g_assert (!nm_ip4_addr_is_localhost (nmtst_inet4_from_string ("128.5.0.1")));
+	g_assert (!nm_ip4_addr_is_localhost (nmtst_inet4_from_string ("129.5.0.1")));
+}
+
+/*****************************************************************************/
+
 NMTST_DEFINE ();
 
 int main (int argc, char **argv)
@@ -215,6 +228,7 @@ int main (int argc, char **argv)
 	g_test_add_func ("/general/test_nm_make_strv", test_make_strv);
 	g_test_add_func ("/general/test_nm_strdup_int", test_nm_strdup_int);
 	g_test_add_func ("/general/test_nm_strndup_a", test_nm_strndup_a);
+	g_test_add_func ("/general/test_nm_ip4_addr_is_localhost", test_nm_ip4_addr_is_localhost);
 
 	return g_test_run ();
 }