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Further mitigate cache effects for OOOR by adding random label to delay lookup. 

It turns out that delay.getdnsapi.net only pays attention to the left-most label.
This commit is contained in:
Jim Hague 2018-02-07 12:41:24 +00:00
parent a25f832d8a
commit 13d7a730ee
1 changed files with 12 additions and 2 deletions
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14
src/tools/getdns_server_mon.c
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@ -1574,10 +1574,20 @@ static exit_value test_out_of_order(struct test_info_s *test_info,
return EXIT_USAGE; return EXIT_USAGE;
} }
/* A set of asynchronous queries to send. One exists. */ /*
* A set of asynchronous queries to send. One exists.
*
* Replies from delay.getdns.api come back with a 1s TTL. It turns out
* that delay.getdns.api will ignore all leftmost labels bar the first,
* so to further mitigate any cache effects insert a random string
* into the name.
*/
const char GOOD_NAME[] = "getdnsapi.net"; const char GOOD_NAME[] = "getdnsapi.net";
char delay_name[50];
srand(time(NULL));
snprintf(delay_name, sizeof(delay_name) - 1, "400.n%04d.delay.getdnsapi.net", rand() % 10000);
struct async_query async_queries[] = { struct async_query async_queries[] = {
{ "400.delay.getdnsapi.net", 0, false }, { delay_name, 0, false },
{ GOOD_NAME, 0, false } { GOOD_NAME, 0, false }
}; };
unsigned NQUERIES = sizeof(async_queries) / sizeof(async_queries[0]); unsigned NQUERIES = sizeof(async_queries) / sizeof(async_queries[0]);