1 files changed, 54 insertions, 0 deletions
diff --git a/tests/sys/net/transient_tuntap.c b/tests/sys/net/transient_tuntap.c
new file mode 100644
index 000000000000..b0cf43064317
--- /dev/null
+++ b/tests/sys/net/transient_tuntap.c
@@ -0,0 +1,54 @@
+/*-
+ * Copyright (c) 2024 Kyle Evans <kevans@FreeBSD.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+/*
+ * This test simply configures the tunnel as transient and exits.  By the time
+ * we return, the tunnel should be gone because the last reference disappears.
+ */
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <net/if_tun.h>
+#include <net/if_tap.h>
+
+#include <assert.h>
+#include <err.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+int
+main(int argc, char *argv[])
+{
+	unsigned long tunreq;
+	const char *tundev;
+	int one = 1, tunfd;
+
+	assert(argc > 1);
+	tundev = argv[1];
+
+	tunfd = open(tundev, O_RDWR);
+	assert(tunfd >= 0);
+
+	/*
+	 * These are technically the same request, but we'll use the technically
+	 * correct one just in case.
+	 */
+	if (strstr(tundev, "tun") != NULL) {
+		tunreq = TUNSTRANSIENT;
+	} else {
+		assert(strstr(tundev, "tap") != NULL);
+		tunreq = TAPSTRANSIENT;
+	}
+
+	if (ioctl(tunfd, tunreq, &one) == -1)
+		err(1, "ioctl");
+
+	/* Final close should destroy the tunnel automagically. */
+	close(tunfd);
+
+	return (0);
+}