From ae7d4f67ba782f7f53deaf0596a2b52155617a6b Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Wed, 2 Jun 2021 00:37:20 +0200
Subject: add dns tests

---
 tests/dns.c   | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/main.c  | 35 +++++++++++++++--------------------
 tests/tests.h | 15 +++++++++++++++
 3 files changed, 80 insertions(+), 20 deletions(-)
 create mode 100644 tests/dns.c
 create mode 100644 tests/tests.h

diff --git a/tests/dns.c b/tests/dns.c
new file mode 100644
index 0000000..c100cd4
--- /dev/null
+++ b/tests/dns.c
@@ -0,0 +1,50 @@
+/*
+ * tests/dns.c
+ * (c) 2021 Jonas Gunz <himself@jonasgunz.de>
+ * License: MIT
+ */
+
+#include "tests.h"
+
+#include <dns.h>
+
+START_TEST (dns_qname) {
+	char in[128];
+	char out[128];
+
+	strncpy ( in, "sub.domain.example.com\0", 127);
+
+	ck_assert_int_gt( fqdn_to_qname (in,128,out,128), 0 );
+	ck_assert_int_ge( qname_check(out,128), 0 );
+	ck_assert_int_gt( qname_to_fqdn (out,128,in,128), 0);
+} END_TEST
+
+START_TEST (dns_qname_fuzz) {
+	FILE* urand = fopen ("/dev/urandom", "r");
+	char rand[128];
+	const unsigned long int limit = 1000000;
+	unsigned long int valid_cnt = 0;
+	unsigned long int i;
+
+	if ( !urand )
+		ck_abort_msg("Failed to open /dev/urandom");
+
+	for ( i = 0; i < limit; i++) {
+		if (fread (rand, 128, 1, urand) > 0) {
+			if ( qname_check(rand, 128) > 0 ) {
+				valid_cnt++;
+			}
+		}
+	}
+
+	ck_assert_float_le( (float)valid_cnt / (float)limit * 100, 10);
+}
+
+TCase* test_dns(void) {
+	TCase *tc = tcase_create("DNS");
+
+	tcase_add_test(tc, dns_qname);
+	tcase_add_test(tc, dns_qname_fuzz);
+
+	return tc;
+}
diff --git a/tests/main.c b/tests/main.c
index 65d527f..4b1cfd2 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -1,33 +1,28 @@
-#include <check.h>
-
-START_TEST (test_example) {
-	ck_abort();
-} END_TEST
-
-Suite* tests(void) {
-	Suite *s;
-	TCase *tc_core;
-
-	s = suite_create("DNS Tests");
-
-	tc_core = tcase_create("Core");
+/*
+ * tests/main.c
+ * (c) 2021 Jonas Gunz <himself@jonasgunz.de>
+ * License: MIT
+ */
 
-	tcase_add_test(tc_core, test_example);
-	suite_add_tcase(s, tc_core);
+#include <check.h>
 
-	return s;
-}
+#include "tests.h"
 
 int main() {
 	Suite *s;
 	SRunner *sr;
+	int failed;
 
-	s = tests();
-	sr = srunner_create(s);
+	s = suite_create("All Tests");
 
+	suite_add_tcase(s, test_dns());
+
+	sr = srunner_create(s);
 	srunner_run_all(sr,CK_NORMAL);
 
+	failed = srunner_ntests_failed(sr);
+
 	srunner_free(sr);
 
-	return srunner_ntests_failed(sr);
+	return failed;
 }
diff --git a/tests/tests.h b/tests/tests.h
new file mode 100644
index 0000000..8af805f
--- /dev/null
+++ b/tests/tests.h
@@ -0,0 +1,15 @@
+/*
+ * tests/tests.h
+ * (c) 2021 Jonas Gunz <himself@jonasgunz.de>
+ * License: MIT
+ */
+
+#pragma once
+
+#include <check.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+TCase* test_dns(void);
-- 
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