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bind9/tests/dns/badcache_test.c
Ondřej Surý 2cb5a6210f
Improve the badcache cleaning by adding LRU and using RCU 
Instead of cleaning the dns_badcache opportunistically, add per-loop
LRU, so each thread-loop can clean the expired entries.  This also
allows removal of the atomic operations as the badcache entries are now
immutable, instead of updating the badcache entry in place, the old
entry is now deleted from the hashtable and the LRU list, and the new
entry is inserted in the LRU.
2024-11-27 17:44:53 +01:00

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/*
* 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.
*/
#include <inttypes.h>
#include <sched.h> /* IWYU pragma: keep */
#include <setjmp.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define UNIT_TESTING
#include <cmocka.h>
#include <isc/buffer.h>
#include <isc/commandline.h>
#include <isc/md.h>
#include <isc/mem.h>
#include <isc/os.h>
#include <isc/thread.h>
#include <isc/urcu.h>
#include <isc/util.h>
#include <isc/uv.h>
#include <dns/badcache.h>
#include <dns/compress.h>
#include <dns/fixedname.h>
#include <dns/name.h>
#include <dns/rdatatype.h>
#include <tests/dns.h>
#define BADCACHE_TEST_FLAG 1 << 3
ISC_LOOP_TEST_IMPL(basic) {
dns_badcache_t *bc = NULL;
dns_fixedname_t fname = { 0 };
dns_name_t *name = dns_fixedname_initname(&fname);
isc_stdtime_t now = isc_stdtime_now();
isc_result_t result;
uint32_t flags = BADCACHE_TEST_FLAG;
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
bc = dns_badcache_new(mctx, loopmgr);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now + 60);
flags = 0;
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
assert_int_equal(flags, BADCACHE_TEST_FLAG);
flags = 0;
result = dns_badcache_find(bc, name, dns_rdatatype_a, &flags, now);
assert_int_equal(result, ISC_R_NOTFOUND);
assert_int_equal(flags, 0);
dns_badcache_destroy(&bc);
isc_loopmgr_shutdown(loopmgr);
}
ISC_LOOP_TEST_IMPL(expire) {
dns_badcache_t *bc = NULL;
dns_fixedname_t fname = { 0 };
dns_name_t *name = dns_fixedname_initname(&fname);
isc_stdtime_t now = isc_stdtime_now();
isc_result_t result;
uint32_t flags = BADCACHE_TEST_FLAG;
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
bc = dns_badcache_new(mctx, loopmgr);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now + 60);
dns_badcache_add(bc, name, dns_rdatatype_a, flags, now + 60);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
assert_int_equal(flags, BADCACHE_TEST_FLAG);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags,
now + 61);
assert_int_equal(result, ISC_R_NOTFOUND);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_NOTFOUND);
result = dns_badcache_find(bc, name, dns_rdatatype_a, &flags, now);
assert_int_equal(result, ISC_R_NOTFOUND);
dns_badcache_add(bc, name, dns_rdatatype_a, flags, now + 120);
result = dns_badcache_find(bc, name, dns_rdatatype_a, &flags, now + 61);
assert_int_equal(result, ISC_R_SUCCESS);
assert_int_equal(flags, BADCACHE_TEST_FLAG);
dns_badcache_destroy(&bc);
isc_loopmgr_shutdown(loopmgr);
}
ISC_LOOP_TEST_IMPL(print) {
dns_badcache_t *bc = NULL;
dns_fixedname_t fname = { 0 };
dns_name_t *name = dns_fixedname_initname(&fname);
isc_stdtime_t now = isc_stdtime_now();
isc_stdtime_t expire = now + 60;
uint32_t flags = BADCACHE_TEST_FLAG;
FILE *file = NULL;
char buf[4096];
size_t len;
char *pos;
char *endptr;
const char *header_part = ";\n; badcache\n;\n";
const char *bol_part = "; ";
const char *name_part = "example.com/";
const char *ttl_part = " [ttl ";
const char *eol_part = "]\n";
size_t num_a = 0;
bool seen_a = false, seen_aaaa = false;
long ttl;
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
bc = dns_badcache_new(mctx, loopmgr);
dns_badcache_add(bc, name, dns_rdatatype_a, flags, expire);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, expire);
file = fopen("./badcache.out", "w");
dns_badcache_print(bc, "badcache", file);
fclose(file);
file = fopen("./badcache.out", "r");
len = fread(buf, sizeof(buf[0]), ARRAY_SIZE(buf), file);
assert_int_equal(len, 68);
fclose(file);
pos = buf;
assert_memory_equal(pos, header_part, strlen(header_part));
pos += strlen(header_part);
line:
/* There's no fixed order for A and AAAA types in the hash table */
assert_memory_equal(pos, bol_part, strlen(bol_part));
pos += strlen(bol_part);
assert_memory_equal(pos, name_part, strlen(name_part));
pos += strlen(name_part);
num_a = 0;
while (*pos == 'A') {
num_a++;
pos++;
}
switch (num_a) {
case 1:
seen_a = true;
break;
case 4:
seen_aaaa = true;
break;
default:
assert_true(num_a == 1 || num_a == 4);
}
assert_memory_equal(pos, ttl_part, strlen(ttl_part));
pos += strlen(ttl_part);
ttl = strtol(pos, &endptr, 0);
assert_ptr_not_equal(pos, endptr);
assert_true(ttl >= 0 && ttl <= 60);
pos = endptr;
assert_memory_equal(pos, eol_part, strlen(eol_part));
pos += strlen(eol_part);
if (!seen_a || !seen_aaaa) {
goto line;
}
assert_int_equal(pos - buf, len);
dns_badcache_destroy(&bc);
isc_loopmgr_shutdown(loopmgr);
}
ISC_LOOP_TEST_IMPL(flush) {
dns_badcache_t *bc = NULL;
dns_fixedname_t fname = { 0 };
dns_name_t *name = dns_fixedname_initname(&fname);
isc_stdtime_t now = isc_stdtime_now();
isc_result_t result;
uint32_t flags = BADCACHE_TEST_FLAG;
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
bc = dns_badcache_new(mctx, loopmgr);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now + 60);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
dns_badcache_flush(bc);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_NOTFOUND);
dns_badcache_destroy(&bc);
isc_loopmgr_shutdown(loopmgr);
}
ISC_LOOP_TEST_IMPL(flushname) {
dns_badcache_t *bc = NULL;
dns_fixedname_t fname = { 0 };
dns_name_t *name = dns_fixedname_initname(&fname);
isc_stdtime_t now = isc_stdtime_now();
isc_result_t result;
uint32_t flags = BADCACHE_TEST_FLAG;
bc = dns_badcache_new(mctx, loopmgr);
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now + 60);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
dns_name_fromstring(name, "sub.example.com.", NULL, 0, NULL);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now + 60);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
dns_name_fromstring(name, "sub.sub.example.com.", NULL, 0, NULL);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now + 60);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
dns_name_fromstring(name, "sub.example.com.", NULL, 0, NULL);
dns_badcache_flushname(bc, name);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_NOTFOUND);
result = dns_badcache_find(bc, name, dns_rdatatype_a, &flags, now);
assert_int_equal(result, ISC_R_NOTFOUND);
dns_name_fromstring(name, "sub.sub.example.com.", NULL, 0, NULL);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
dns_badcache_destroy(&bc);
isc_loopmgr_shutdown(loopmgr);
}
ISC_LOOP_TEST_IMPL(flushtree) {
dns_badcache_t *bc = NULL;
dns_fixedname_t fname = { 0 };
dns_name_t *name = dns_fixedname_initname(&fname);
isc_stdtime_t now = isc_stdtime_now();
isc_result_t result;
uint32_t flags = BADCACHE_TEST_FLAG;
bc = dns_badcache_new(mctx, loopmgr);
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now + 60);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
assert_int_equal(flags, BADCACHE_TEST_FLAG);
dns_name_fromstring(name, "sub.example.com.", NULL, 0, NULL);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now + 60);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
assert_int_equal(flags, BADCACHE_TEST_FLAG);
dns_name_fromstring(name, "sub.sub.example.com.", NULL, 0, NULL);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now + 60);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
assert_int_equal(flags, BADCACHE_TEST_FLAG);
dns_name_fromstring(name, "sub.example.com.", NULL, 0, NULL);
dns_badcache_flushtree(bc, name);
dns_name_fromstring(name, "sub.sub.example.com.", NULL, 0, NULL);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_NOTFOUND);
dns_name_fromstring(name, "sub.example.com.", NULL, 0, NULL);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_NOTFOUND);
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags, now);
assert_int_equal(result, ISC_R_SUCCESS);
assert_int_equal(flags, BADCACHE_TEST_FLAG);
dns_badcache_destroy(&bc);
isc_loopmgr_shutdown(loopmgr);
}
ISC_LOOP_TEST_IMPL(purge) {
dns_badcache_t *bc = NULL;
dns_fixedname_t fname = { 0 };
dns_name_t *name = dns_fixedname_initname(&fname);
isc_stdtime_t now = isc_stdtime_now();
isc_result_t result;
uint32_t flags = BADCACHE_TEST_FLAG;
bc = dns_badcache_new(mctx, loopmgr);
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags,
now - 60);
assert_int_equal(result, ISC_R_SUCCESS);
dns_name_fromstring(name, "sub.example.com.", NULL, 0, NULL);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags,
now - 60);
assert_int_equal(result, ISC_R_SUCCESS);
dns_name_fromstring(name, "sub.sub.example.com.", NULL, 0, NULL);
dns_badcache_add(bc, name, dns_rdatatype_aaaa, flags, now);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags,
now - 60);
assert_int_equal(result, ISC_R_SUCCESS);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags,
now + 30);
assert_int_equal(result, ISC_R_NOTFOUND);
dns_name_fromstring(name, "sub.sub.example.com.", NULL, 0, NULL);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags,
now + 30);
assert_int_equal(result, ISC_R_NOTFOUND);
dns_name_fromstring(name, "sub.example.com.", NULL, 0, NULL);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags,
now + 30);
assert_int_equal(result, ISC_R_NOTFOUND);
dns_name_fromstring(name, "example.com.", NULL, 0, NULL);
result = dns_badcache_find(bc, name, dns_rdatatype_aaaa, &flags,
now + 30);
assert_int_equal(result, ISC_R_NOTFOUND);
dns_badcache_destroy(&bc);
isc_loopmgr_shutdown(loopmgr);
}
ISC_TEST_LIST_START
ISC_TEST_ENTRY_CUSTOM(basic, setup_managers, teardown_managers)
ISC_TEST_ENTRY_CUSTOM(expire, setup_managers, teardown_managers)
ISC_TEST_ENTRY_CUSTOM(print, setup_managers, teardown_managers)
ISC_TEST_ENTRY_CUSTOM(flush, setup_managers, teardown_managers)
ISC_TEST_ENTRY_CUSTOM(flushname, setup_managers, teardown_managers)
ISC_TEST_ENTRY_CUSTOM(flushtree, setup_managers, teardown_managers)
ISC_TEST_ENTRY_CUSTOM(purge, setup_managers, teardown_managers)
ISC_TEST_LIST_END
ISC_TEST_MAIN
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