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/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <tap/basic.h>
#include <tap/files.h>
#include <string.h>
#include <stdlib.h>
#include "libknot/descriptor.h"
#include "libknot/packet/wire.h"
#include "knot/nameserver/process_query.h"
#include "test_server.h"
#include "contrib/sockaddr.h"
#include "contrib/ucw/mempool.h"
/* Basic response check (4 TAP tests). */
static void answer_sanity_check(const uint8_t *query,
const uint8_t *answer, uint16_t answer_len,
uint8_t expected_rcode, const char *name)
{
ok(answer_len >= KNOT_WIRE_HEADER_SIZE, "ns: len(%s answer) >= DNS header", name);
if (answer_len >= KNOT_WIRE_HEADER_SIZE) {
ok(knot_wire_get_qr(answer), "ns: %s answer has QR=1", name);
is_int(expected_rcode, knot_wire_get_rcode(answer), "ns: %s answer RCODE=%d", name, expected_rcode);
is_int(knot_wire_get_id(query), knot_wire_get_id(answer), "ns: %s MSGID match", name);
} else {
skip_block(3, "ns: can't check DNS header");
}
}
/* Resolve query and check answer for sanity (2 TAP tests). */
static void exec_query(knot_layer_t *layer, const char *name,
knot_pkt_t *query,
uint8_t expected_rcode)
{
knot_pkt_t *answer = knot_pkt_new(NULL, KNOT_WIRE_MAX_PKTSIZE, NULL);
assert(answer);
/* Input packet. */
knot_pkt_parse(query, 0);
knot_layer_consume(layer, query);
ok(layer->state == KNOT_STATE_PRODUCE ||
layer->state == KNOT_STATE_FAIL, "ns: process %s query", name);
/* Create answer. */
knot_layer_produce(layer, answer);
if (layer->state == KNOT_STATE_FAIL) {
/* Allow 1 generic error response. */
knot_layer_produce(layer, answer);
}
ok(layer->state == KNOT_STATE_DONE, "ns: answer %s query", name);
/* Check answer. */
answer_sanity_check(query->wire, answer->wire, answer->size, expected_rcode, name);
knot_pkt_free(answer);
}
/* \internal Helpers */
#define WIRE_COPY(dst, dst_len, src, src_len) \
memcpy(dst, src, src_len); \
dst_len = src_len;
int main(int argc, char *argv[])
{
plan_lazy();
knot_mm_t mm;
mm_ctx_mempool(&mm, MM_DEFAULT_BLKSIZE);
/* Create processing context. */
knot_layer_t proc;
memset(&proc, 0, sizeof(knot_layer_t));
knot_layer_init(&proc, &mm, process_query_layer());
/* Create temporary storage directory. */
char *temp_dir = test_mkdtemp();
ok(temp_dir != NULL, "make temporary directory");
/* Create fake server environment. */
server_t server;
int ret = create_fake_server(&server, proc.mm, temp_dir);
is_int(KNOT_EOK, ret, "ns: fake server initialization");
if (ret != KNOT_EOK) {
goto fatal;
}
zone_t *zone = knot_zonedb_find(server.zone_db, ROOT_DNAME);
/* Prepare. */
knot_pkt_t *query = knot_pkt_new(NULL, KNOT_WIRE_MAX_PKTSIZE, proc.mm);
/* Create query processing parameter. */
struct sockaddr_storage ss;
memset(&ss, 0, sizeof(struct sockaddr_storage));
sockaddr_set(&ss, AF_INET, "127.0.0.1", 53);
knotd_qdata_params_t params = {
.proto = KNOTD_QUERY_PROTO_TCP,
.remote = &ss,
.server = &server
};
/* Query processor (CH zone) */
knot_layer_begin(&proc, ¶ms);
knot_pkt_clear(query);
knot_pkt_put_question(query, IDSERVER_DNAME, KNOT_CLASS_CH, KNOT_RRTYPE_TXT);
exec_query(&proc, "CH TXT", query, KNOT_RCODE_NOERROR);
/* Query processor (valid input). */
knot_layer_reset(&proc);
knot_pkt_clear(query);
knot_pkt_put_question(query, ROOT_DNAME, KNOT_CLASS_IN, KNOT_RRTYPE_SOA);
exec_query(&proc, "IN/root", query, KNOT_RCODE_NOERROR);
/* Query processor (-1 bytes, not enough data). */
knot_layer_reset(&proc);
query->size -= 1;
exec_query(&proc, "IN/few-data", query, KNOT_RCODE_FORMERR);
query->size += 1;
/* Query processor (+1 bytes trailing). */
knot_layer_reset(&proc);
query->wire[query->size] = '\1'; /* Initialize the "garbage" value. */
query->size += 1;
exec_query(&proc, "IN/trail-garbage", query, KNOT_RCODE_FORMERR);
query->size -= 1;
/* Forge NOTIFY query from SOA query. */
knot_layer_reset(&proc);
knot_wire_set_opcode(query->wire, KNOT_OPCODE_NOTIFY);
exec_query(&proc, "IN/notify", query, KNOT_RCODE_NOTAUTH);
/* Forge AXFR query. */
knot_layer_reset(&proc);
knot_pkt_clear(query);
knot_pkt_put_question(query, ROOT_DNAME, KNOT_CLASS_IN, KNOT_RRTYPE_AXFR);
exec_query(&proc, "IN/axfr", query, KNOT_RCODE_NOTAUTH);
/* Forge IXFR query (well formed). */
knot_layer_reset(&proc);
knot_pkt_clear(query);
knot_pkt_put_question(query, ROOT_DNAME, KNOT_CLASS_IN, KNOT_RRTYPE_IXFR);
/* Append SOA RR. */
knot_rrset_t soa_rr = node_rrset(zone->contents->apex, KNOT_RRTYPE_SOA);
knot_pkt_begin(query, KNOT_AUTHORITY);
knot_pkt_put(query, KNOT_COMPR_HINT_NONE, &soa_rr, 0);
exec_query(&proc, "IN/ixfr", query, KNOT_RCODE_NOTAUTH);
/* \note Tests below are not possible without proper zone and zone data. */
/* #189 Process UPDATE query. */
/* #189 Process AXFR client. */
/* #189 Process IXFR client. */
/* Query processor (smaller than DNS header, ignore). */
knot_layer_reset(&proc);
knot_pkt_clear(query);
knot_pkt_put_question(query, ROOT_DNAME, KNOT_CLASS_IN, KNOT_RRTYPE_SOA);
size_t orig_query_size = query->size;
query->size = KNOT_WIRE_HEADER_SIZE - 1;
knot_layer_consume(&proc, query);
ok(proc.state == KNOT_STATE_NOOP, "ns: IN/less-than-header query ignored");
query->size = orig_query_size;
/* Query processor (response, ignore). */
knot_layer_reset(&proc);
knot_wire_set_qr(query->wire);
knot_layer_consume(&proc, query);
ok(proc.state == KNOT_STATE_NOOP, "ns: IN/less-than-header query ignored");
/* Finish. */
knot_layer_finish(&proc);
ok(proc.state == KNOT_STATE_NOOP, "ns: processing end" );
fatal:
/* Cleanup. */
mp_delete((struct mempool *)mm.ctx);
server_deinit(&server);
conf_free(conf());
test_rm_rf(temp_dir);
free(temp_dir);
return 0;
}
#undef WIRE_COPY
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