test: add test for nsresourced

src/test/meson.build

@@ -132,6 +132,7 @@ simple_tests += files(
         'test-modhex.c',
         'test-mountpoint-util.c',
         'test-net-naming-scheme.c',
+        'test-nsresource.c',
         'test-nulstr-util.c',
         'test-open-file.c',
         'test-ordered-set.c',

src/test/test-nsresource.c

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <net/if.h>
+
+#include "fd-util.h"
+#include "namespace-util.h"
+#include "nsresource.h"
+#include "tests.h"
+
+TEST(delegatetap) {
+        int r;
+
+        _cleanup_close_ int userns_fd = userns_acquire_self_root();
+        if (ERRNO_IS_NEG_PRIVILEGE(userns_fd) || ERRNO_IS_NEG_NOT_SUPPORTED(userns_fd))
+                return (void) log_tests_skipped_errno(userns_fd, "User namespaces not available");
+        ASSERT_OK(userns_fd);
+
+        r = nsresource_register_userns("foobar", userns_fd);
+        if (ERRNO_IS_NEG_DISCONNECT(r) || r == -ENOENT || ERRNO_IS_NEG_NOT_SUPPORTED(r))
+                return (void) log_tests_skipped_errno(r, "systemd-nsresourced cannot be reached");
+        ASSERT_OK(r);
+
+        _cleanup_free_ char *ifname = NULL;
+        _cleanup_close_ int tap_fd = nsresource_add_netif_tap(userns_fd, &ifname);
+        if (ERRNO_IS_NEG_NOT_SUPPORTED(tap_fd))
+                return (void) log_tests_skipped_errno(tap_fd, "tap device support not available");
+        ASSERT_OK(tap_fd);
+
+        ASSERT_GE(if_nametoindex(ifname), 2U);
+}
+
+DEFINE_TEST_MAIN(LOG_DEBUG);