1 files changed, 107 insertions, 0 deletions
diff --git a/lib/isc/tests/safe_test.c b/lib/isc/tests/safe_test.c
new file mode 100644
index 0000000..89bd3ba
--- /dev/null
+++ b/lib/isc/tests/safe_test.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/* ! \file */
+
+#if HAVE_CMOCKA
+
+#include <sched.h> /* IWYU pragma: keep */
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define UNIT_TESTING
+#include <cmocka.h>
+
+#include <isc/safe.h>
+#include <isc/util.h>
+
+/* test isc_safe_memequal() */
+static void
+isc_safe_memequal_test(void **state) {
+	UNUSED(state);
+
+	assert_true(isc_safe_memequal("test", "test", 4));
+	assert_true(!isc_safe_memequal("test", "tesc", 4));
+	assert_true(
+		isc_safe_memequal("\x00\x00\x00\x00", "\x00\x00\x00\x00", 4));
+	assert_true(
+		!isc_safe_memequal("\x00\x00\x00\x00", "\x00\x00\x00\x01", 4));
+	assert_true(
+		!isc_safe_memequal("\x00\x00\x00\x02", "\x00\x00\x00\x00", 4));
+}
+
+/* test isc_safe_memwipe() */
+static void
+isc_safe_memwipe_test(void **state) {
+	UNUSED(state);
+
+	/* These should pass. */
+	isc_safe_memwipe(NULL, 0);
+	isc_safe_memwipe((void *)-1, 0);
+
+	/*
+	 * isc_safe_memwipe(ptr, size) should function same as
+	 * memset(ptr, 0, size);
+	 */
+	{
+		char buf1[4] = { 1, 2, 3, 4 };
+		char buf2[4] = { 1, 2, 3, 4 };
+
+		isc_safe_memwipe(buf1, sizeof(buf1));
+		memset(buf2, 0, sizeof(buf2));
+
+		assert_int_equal(memcmp(buf1, buf2, sizeof(buf1)), 0);
+	}
+
+	/*
+	 * Boundary test.
+	 */
+	{
+		char buf1[4] = { 1, 2, 3, 4 };
+		char buf2[4] = { 1, 2, 3, 4 };
+
+		/*
+		 * We wipe 3 elements on purpose, keeping the 4th in
+		 * place.
+		 */
+		isc_safe_memwipe(buf1, 3);
+		memset(buf2, 0, 3);
+
+		assert_int_equal(memcmp(buf1, buf2, sizeof(buf1)), 0);
+	}
+}
+
+int
+main(void) {
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(isc_safe_memequal_test),
+		cmocka_unit_test(isc_safe_memwipe_test),
+	};
+
+	return (cmocka_run_group_tests(tests, NULL, NULL));
+}
+
+#else /* HAVE_CMOCKA */
+
+#include <stdio.h>
+
+int
+main(void) {
+	printf("1..0 # Skipped: cmocka not available\n");
+	return (SKIPPED_TEST_EXIT_CODE);
+}
+
+#endif /* if HAVE_CMOCKA */