Allow TTL skew in the badcache print unit test

If the machine running the job is extra loaded (or extra slow), the
print test in the badcache unit test would fail because the TTL would be
59 (possibly even lower) and the test expects the badcache.out to only
have TTL 60.  Refactor the test to check for the expected strings and
check whether the TTL is in the expected range.

diff --git a/tests/dns/badcache_test.c b/tests/dns/badcache_test.c
index f7151b73fdfcec8a3710943dfbdca27fe6d64e03..0c81c7ac02cbe4e93849cdc23f0faf384d67c650 100644 (file)
--- a/tests/dns/badcache_test.c
+++ b/tests/dns/badcache_test.c
@@ -43,20 +43,6 @@
 
 #include <tests/dns.h>
 
-static uint32_t
-crc32(const uint8_t *buf, size_t size) {
-       uint32_t crc;
-       crc = 0xFFFFFFFF;
-       while (size--) {
-               crc = crc ^ *buf++;
-               for (size_t j = 0; j < 8; j++) {
-                       uint32_t mask = -(crc & 1);
-                       crc = (crc >> 1) ^ (0xedb88320 & mask);
-               }
-       }
-       return (~crc);
-}
-
 #define BADCACHE_TEST_FLAG 1 << 3
 
 ISC_LOOP_TEST_IMPL(basic) {
@@ -135,8 +121,14 @@ ISC_LOOP_TEST_IMPL(print) {
        isc_stdtime_t expire = now + 60;
        uint32_t flags = BADCACHE_TEST_FLAG;
        FILE *file = NULL;
-       uint8_t buf[4096];
+       char buf[4096];
        size_t len;
+       char *pos;
+       char *endptr;
+       const char *part1 = ";\n; badcache\n;\n; example.com/A [ttl ";
+       const char *part2 = "]\n; example.com/AAAA [ttl ";
+       const char *part3 = "]\n";
+       long ttl;
 
        dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
 
@@ -153,8 +145,27 @@ ISC_LOOP_TEST_IMPL(print) {
        assert_int_equal(len, 68);
        fclose(file);
 
-       /* Calculated as crc32 ./badcache.out */
-       assert_int_equal(crc32(buf, len), 0x7c96678f);
+       pos = buf;
+       assert_memory_equal(pos, part1, strlen(part1));
+       pos += strlen(part1);
+
+       ttl = strtol(pos, &endptr, 0);
+       assert_ptr_not_equal(pos, endptr);
+       assert_true(ttl >= 0 && ttl <= 60);
+       pos = endptr;
+
+       assert_memory_equal(pos, part2, strlen(part2));
+       pos += strlen(part2);
+
+       ttl = strtol(pos, &endptr, 0);
+       assert_ptr_not_equal(pos, endptr);
+       assert_true(ttl >= 0 && ttl <= 60);
+       pos = endptr;
+
+       assert_memory_equal(pos, part3, strlen(part3));
+       pos += strlen(part3);
+
+       assert_int_equal(pos - buf, len);
 
        dns_badcache_destroy(&bc);