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-rw-r--r--tests/libknot/test_edns.c502
1 files changed, 502 insertions, 0 deletions
diff --git a/tests/libknot/test_edns.c b/tests/libknot/test_edns.c
new file mode 100644
index 0000000..d2b4fd8
--- /dev/null
+++ b/tests/libknot/test_edns.c
@@ -0,0 +1,502 @@
+/* Copyright (C) 2018 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 <tap/basic.h>
+
+#include <assert.h>
+#include "libknot/libknot.h"
+#include "libknot/rrtype/opt.h"
+#include "libknot/descriptor.h"
+#include "libknot/wire.h"
+#include "contrib/sockaddr.h"
+
+static const uint16_t E_MAX_PLD = 10000;
+static const uint16_t E_MAX_PLD2 = 20000;
+static const uint8_t E_VERSION = 1;
+static const uint8_t E_VERSION2 = 2;
+static const uint8_t E_RCODE = 0;
+static const uint8_t E_RCODE2 = 200;
+
+static const char *E_NSID_STR = "FooBar";
+static const char *E_NSID_STR2 = "BarFoo";
+static const uint16_t E_NSID_LEN = 6;
+
+#define E_NSID_SIZE (4 + E_NSID_LEN)
+
+static const uint16_t E_OPT3_CODE = 15;
+static const char *E_OPT3_FAKE_DATA = "Not used";
+static const char *E_OPT3_DATA = NULL;
+static const uint16_t E_OPT3_LEN = 0;
+static const uint16_t E_OPT3_FAKE_LEN = 8;
+
+#define E_OPT3_SIZE (4 + E_OPT3_LEN)
+
+static const uint16_t E_OPT4_CODE = 30;
+static const char *E_OPT4_DATA = NULL;
+static const uint16_t E_OPT4_LEN = 0;
+
+#define E_OPT4_SIZE (4 + E_OPT4_LEN)
+
+enum offsets {
+ /*! \brief Offset of Extended RCODE in wire order of TTL. */
+ OFFSET_ERCODE = 0,
+ /*! \brief Offset of Version in wire order of TTL. */
+ OFFSET_VER = 1,
+ /*! \brief Offset of Flags in wire order of TTL. */
+ OFFSET_FLAGS = 2,
+ /*! \brief Offset of OPTION code in one OPTION in RDATA. */
+ OFFSET_OPT_CODE = 0,
+ /*! \brief Offset of OPTION size in one OPTION in RDATA. */
+ OFFSET_OPT_SIZE = 2,
+ /*! \brief Offset of OPTION data in one OPTION in RDATA. */
+ OFFSET_OPT_DATA = 4
+};
+
+static const uint16_t DO_FLAG = (uint16_t)1 << 15;
+
+static void check_ttl(knot_rrset_t *rrset, uint8_t ext_rcode, uint8_t ver,
+ uint16_t flags, char *msg)
+{
+ if (rrset == NULL) {
+ return;
+ }
+
+ /* TTL should be stored in machine byte order.
+ We need network byte order to compare its parts. */
+ uint8_t ttl_wire[4] = { 0, 0, 0, 0 };
+ knot_wire_write_u32(ttl_wire, rrset->ttl);
+
+ /* Convert Flags from EDNS parameters to wire format for comparison. */
+ uint8_t flags_wire[2] = { 0, 0 };
+ knot_wire_write_u16(flags_wire, flags);
+
+ /* TTL = Ext RCODE + Version + Flags */
+ bool check = (ttl_wire[OFFSET_ERCODE] == ext_rcode);
+ ok(check, "%s: extended RCODE", msg);
+
+ check = (ttl_wire[OFFSET_VER] == ver);
+ ok(check, "%s: version", msg);
+
+ check = (memcmp(flags_wire, ttl_wire + OFFSET_FLAGS, 2) == 0);
+ ok(check, "%s: flags", msg);
+}
+
+static void check_option(knot_rdata_t *rdata, uint16_t opt_code,
+ uint16_t opt_len, uint8_t *opt_data, char *msg)
+{
+ assert(rdata != NULL);
+
+ uint8_t *data = rdata->data;
+ uint16_t data_len = rdata->len;
+
+ /* Check RDLENGTH according to given data length. */
+ bool check = (data_len >= 4 + opt_len);
+ ok(check, "%s: RDLENGTH (%u)", msg, data_len);
+
+ /* Find the desired option. */
+ bool found = false;
+ int pos = 0;
+ while (pos <= data_len - 4) {
+ uint16_t code = knot_wire_read_u16(data + pos + OFFSET_OPT_CODE);
+ if (code == opt_code) {
+ found = true;
+ break;
+ }
+ uint16_t len = knot_wire_read_u16(data + pos + OFFSET_OPT_SIZE);
+ pos += 4 + len;
+ }
+
+ /* Check that the option is present. */
+ ok(found, "%s: find OPTION %u in OPT RR", msg, opt_code);
+
+ /* Check that the first OPTION's size si the size of the option data. */
+ uint16_t opt_size = knot_wire_read_u16(data + pos + OFFSET_OPT_SIZE);
+ check = (opt_size == opt_len);
+ ok(check, "%s: OPTION data size", msg);
+
+ /* Check the actual NSID data. */
+ check = (opt_data == 0 || memcmp(data + pos + OFFSET_OPT_DATA, opt_data, opt_len) == 0);
+ ok(check, "%s: OPTION data", msg);
+}
+
+static void check_header(knot_rrset_t *opt_rr, uint16_t payload, uint8_t ver,
+ uint16_t flags, uint8_t ext_rcode, char *msg)
+{
+ assert(opt_rr != NULL);
+ bool check;
+
+ /* Check values in OPT RR by hand. */
+ /* CLASS == Max UDP payload */
+ check = (opt_rr->rclass == payload);
+ ok(check, "%s: max payload", msg);
+
+ /* The OPT RR should have exactly one RDATA. */
+ check = (opt_rr->rrs.count == 1);
+ ok(check, "%s: RR count == 1", msg);
+
+ knot_rdata_t *rdata = opt_rr->rrs.rdata;
+ check = (rdata != NULL);
+ ok(check, "%s: RDATA exists", msg);
+
+ check_ttl(opt_rr, ext_rcode, ver, flags, msg);
+}
+
+static void test_getters(knot_rrset_t *opt_rr)
+{
+ assert(opt_rr != NULL);
+
+ /* These values should be set from the setters test:
+ * Max UDP payload: E_MAX_PLD2
+ * Version: E_VERSION2
+ * RCODE: E_RCODE2
+ * Flags: E_FLAGS | KNOT_EDNS_FLAG_DO
+ * OPTIONs: 1) KNOT_EDNS_OPTION_NSID, E_NSID_LEN, E_NSID_STR
+ * 2) E_OPT3_CODE, 0, 0
+ * 3) E_OPT4_CODE, 0, 0
+ * 4) KNOT_EDNS_OPTION_NSID, E_NSID_LEN, E_NSID_STR2
+ */
+
+ /* Payload */
+ bool check = (knot_edns_get_payload(opt_rr) == E_MAX_PLD2);
+ ok(check, "OPT RR getters: payload");
+
+ /* Extended RCODE */
+ check = (knot_edns_get_ext_rcode(opt_rr) == E_RCODE2);
+ ok(check, "OPT RR getters: extended RCODE");
+
+ /* Extended RCODE */
+ check = (knot_edns_get_version(opt_rr) == E_VERSION2);
+ ok(check, "OPT RR getters: version");
+
+ /* DO bit */
+ check = knot_edns_do(opt_rr);
+ ok(check, "OPT RR getters: DO bit check");
+
+ /* Wire size */
+ size_t total_size = KNOT_EDNS_MIN_SIZE
+ + 2 * E_NSID_SIZE + E_OPT3_SIZE + E_OPT4_SIZE;
+ size_t actual_size = knot_edns_wire_size(opt_rr);
+ check = actual_size == total_size;
+ ok(check, "OPT RR getters: wire size (expected: %zu, actual: %zu)",
+ total_size, actual_size);
+
+ /* NSID */
+ uint8_t *nsid1 = knot_edns_get_option(opt_rr, KNOT_EDNS_OPTION_NSID, NULL);
+ check = nsid1 != NULL;
+ ok(check, "OPT RR getters: NSID check");
+ check = memcmp(knot_edns_opt_get_data(nsid1), E_NSID_STR, knot_edns_opt_get_length(nsid1)) == 0;
+ ok(check, "OPT RR getters: NSID value check");
+
+ /* Another NSID */
+ uint8_t *nsid2 = knot_edns_get_option(opt_rr, KNOT_EDNS_OPTION_NSID, nsid1);
+ check = nsid2 != NULL;
+ ok(check, "OPT RR getters: another NSID check");
+ check = memcmp(knot_edns_opt_get_data(nsid2), E_NSID_STR2, knot_edns_opt_get_length(nsid2)) == 0;
+ ok(check, "OPT RR getters: another NSID value check");
+
+ /* Other OPTIONs */
+ check = knot_edns_get_option(opt_rr, E_OPT3_CODE, NULL) != NULL;
+ ok(check, "OPT RR getters: empty option 1");
+
+ check = knot_edns_get_option(opt_rr, E_OPT4_CODE, NULL) != NULL;
+ ok(check, "OPT RR getters: empty option 2");
+
+ uint16_t code = knot_edns_opt_get_code((const uint8_t *)"\x00\x0a" "\x00\x00");
+ ok(code == KNOT_EDNS_OPTION_COOKIE, "OPT RR getters: EDNS OPT code");
+}
+
+static void test_setters(knot_rrset_t *opt_rr)
+{
+ assert(opt_rr != NULL);
+
+ /* Header-related setters. */
+ knot_edns_set_payload(opt_rr, E_MAX_PLD2);
+ knot_edns_set_ext_rcode(opt_rr, E_RCODE2);
+ knot_edns_set_version(opt_rr, E_VERSION2);
+ knot_edns_set_do(opt_rr);
+
+ check_header(opt_rr, E_MAX_PLD2, E_VERSION2, DO_FLAG, E_RCODE2,
+ "OPT RR setters");
+
+ /* OPTION(RDATA)-related setters. */
+
+ /* Proper option NSID. */
+ int ret = knot_edns_add_option(opt_rr, KNOT_EDNS_OPTION_NSID,
+ E_NSID_LEN, (uint8_t *)E_NSID_STR, NULL);
+ is_int(KNOT_EOK, ret, "OPT RR setters: add option with data (ret = %s)",
+ knot_strerror(ret));
+
+ /* Wrong argument: no OPT RR. */
+ ret = knot_edns_add_option(NULL, E_OPT3_CODE, E_OPT3_FAKE_LEN,
+ (uint8_t *)E_OPT3_FAKE_DATA, NULL);
+ is_int(KNOT_EINVAL, ret, "OPT RR setters: add option (rr == NULL) "
+ "(ret = %s)", knot_strerror(ret));
+
+ /* Wrong argument: option length != 0 && data == NULL. */
+ ret = knot_edns_add_option(opt_rr, E_OPT3_CODE, E_OPT3_FAKE_LEN, NULL,
+ NULL);
+ is_int(KNOT_EINVAL, ret, "OPT RR setters: add option (data == NULL, "
+ "len != 0) (ret = %s)", knot_strerror(ret));
+
+ /* Empty OPTION (length 0, data != NULL). */
+ ret = knot_edns_add_option(opt_rr, E_OPT3_CODE, E_OPT3_LEN,
+ (uint8_t *)E_OPT3_FAKE_DATA, NULL);
+ is_int(KNOT_EOK, ret, "OPT RR setters: add empty option 1 (ret = %s)",
+ knot_strerror(ret));
+
+ /* Empty OPTION (length 0, data == NULL). */
+ ret = knot_edns_add_option(opt_rr, E_OPT4_CODE, E_OPT4_LEN,
+ (uint8_t *)E_OPT4_DATA, NULL);
+ is_int(KNOT_EOK, ret, "OPT RR setters: add empty option 2 (ret = %s)",
+ knot_strerror(ret));
+
+ /* Another option NSID. */
+ ret = knot_edns_add_option(opt_rr, KNOT_EDNS_OPTION_NSID,
+ E_NSID_LEN, (uint8_t *)E_NSID_STR2, NULL);
+ is_int(KNOT_EOK, ret, "OPT RR setters: add option with data (ret = %s)",
+ knot_strerror(ret));
+
+ knot_rdata_t *rdata = opt_rr->rrs.rdata;
+ ok(rdata != NULL, "OPT RR setters: non-empty RDATA");
+
+ /* Check proper option NSID */
+ check_option(rdata, KNOT_EDNS_OPTION_NSID, E_NSID_LEN,
+ (uint8_t *)E_NSID_STR, "OPT RR setters (proper option)");
+
+ /* Check empty option 1 */
+ check_option(rdata, E_OPT3_CODE, E_OPT3_LEN,
+ (uint8_t *)E_OPT3_DATA, "OPT RR setters (empty option 1)");
+
+ /* Check empty option 2 */
+ check_option(rdata, E_OPT4_CODE, E_OPT4_LEN,
+ (uint8_t *)E_OPT4_DATA, "OPT RR setters (empty option 2)");
+}
+
+static void test_alignment(void)
+{
+ int ret;
+
+ ret = knot_edns_alignment_size(1, 1, 1);
+ ok(ret == -1, "no alignment");
+
+ ret = knot_edns_alignment_size(1, 1, 2);
+ ok(ret == -1, "no alignment");
+
+ ret = knot_edns_alignment_size(1, 1, 3);
+ ok(ret == (6 - (1 + 1 + KNOT_EDNS_OPTION_HDRLEN)), "%i-Byte alignment", ret);
+
+ ret = knot_edns_alignment_size(1, 1, 4);
+ ok(ret == (8 - (1 + 1 + KNOT_EDNS_OPTION_HDRLEN)), "%i-Byte alignment", ret);
+
+ ret = knot_edns_alignment_size(1, 1, 512);
+ ok(ret == (512 - (1 + 1 + KNOT_EDNS_OPTION_HDRLEN)), "%i-Byte alignment", ret);
+}
+
+static void test_keepalive(void)
+{
+ typedef struct {
+ char *msg;
+ uint16_t opt_len;
+ char *opt;
+ uint16_t val;
+ } test_t;
+
+ // OK tests.
+
+ static const test_t TESTS[] = {
+ { "ok 0", 0, "", 0 },
+ { "ok 1", 2, "\x00\x01", 1 },
+ { "ok 258", 2, "\x01\x02", 258 },
+ { "ok 65535", 2, "\xFF\xFF", 65535 },
+ { NULL }
+ };
+
+ for (const test_t *t = TESTS; t->msg != NULL; t++) {
+ uint16_t len = knot_edns_keepalive_size(t->val);
+ ok(len == t->opt_len, "%s: %s, size", __func__, t->msg);
+
+ uint8_t wire[8] = { 0 };
+ int ret = knot_edns_keepalive_write(wire, sizeof(wire), t->val);
+ is_int(KNOT_EOK, ret, "%s: %s, write, return", __func__, t->msg);
+ ok(memcmp(wire, t->opt, t->opt_len) == 0, "%s: %s, write, value",
+ __func__, t->msg);
+
+ uint16_t timeout = 0;
+ ret = knot_edns_keepalive_parse(&timeout, (uint8_t *)t->opt, t->opt_len);
+ is_int(KNOT_EOK, ret, "%s: %s, parse, return", __func__, t->msg);
+ ok(timeout == t->val, "%s: %s, parse, value", __func__, t->msg);
+ }
+
+ // Error tests.
+
+ uint8_t wire[8] = { 0 };
+ ok(knot_edns_keepalive_write(NULL, 0, 0) == KNOT_EINVAL,
+ "%s: write, NULL", __func__);
+ ok(knot_edns_keepalive_write(wire, 1, 1) == KNOT_ESPACE,
+ "%s: write, no room", __func__);
+
+ uint16_t timeout = 0;
+ ok(knot_edns_keepalive_parse(NULL, (const uint8_t *)"", 0) == KNOT_EINVAL,
+ "%s: parse, NULL", __func__);
+ ok(knot_edns_keepalive_parse(&timeout, NULL, 0) == KNOT_EINVAL,
+ "%s: parse, NULL", __func__);
+ ok(knot_edns_keepalive_parse(&timeout, (const uint8_t *)"\x01", 1) == KNOT_EMALF,
+ "%s: parse, malformed", __func__);
+}
+
+static void test_chain(void)
+{
+ typedef struct {
+ char *msg;
+ uint16_t opt_len;
+ knot_dname_t *dname;
+ } test_t;
+
+ // OK tests.
+
+ static const test_t TESTS[] = {
+ { ".", 1, (knot_dname_t *)"" },
+ { "a.", 3, (knot_dname_t *)"\x01" "a" },
+ { NULL }
+ };
+
+ for (const test_t *t = TESTS; t->msg != NULL; t++) {
+ uint16_t len = knot_edns_chain_size(t->dname);
+ ok(len == t->opt_len, "%s: dname %s, size", __func__, t->msg);
+
+ uint8_t wire[8] = { 0 };
+ int ret = knot_edns_chain_write(wire, sizeof(wire), t->dname);
+ is_int(KNOT_EOK, ret, "%s: dname %s, write, return", __func__, t->msg);
+ ok(memcmp(wire, t->dname, t->opt_len) == 0, "%s: dname %s, write, value",
+ __func__, t->msg);
+
+ knot_dname_t *dname = NULL;
+ ret = knot_edns_chain_parse(&dname, (uint8_t *)t->dname, t->opt_len, NULL);
+ is_int(KNOT_EOK, ret, "%s: dname %s, parse, return", __func__, t->msg);
+ ok(knot_dname_is_equal(dname, t->dname), "%s: dname %s, parse, value",
+ __func__, t->msg);
+ knot_dname_free(dname, NULL);
+ }
+
+ // Error tests.
+
+ ok(knot_edns_chain_size(NULL) == 0, "%s: size, NULL", __func__);
+
+ uint8_t wire[8] = { 0 };
+ ok(knot_edns_chain_write(NULL, 0, wire) == KNOT_EINVAL,
+ "%s: write, NULL", __func__);
+ ok(knot_edns_chain_write(wire, 0, NULL) == KNOT_EINVAL,
+ "%s: write, NULL", __func__);
+ ok(knot_edns_chain_write(wire, 0, (const knot_dname_t *)"") == KNOT_ESPACE,
+ "%s: write, no room", __func__);
+
+ knot_dname_t *dname = NULL;
+ ok(knot_edns_chain_parse(NULL, wire, 0, NULL) == KNOT_EINVAL && dname == NULL,
+ "%s: parse, NULL", __func__);
+ ok(knot_edns_chain_parse(&dname, NULL, 0, NULL) == KNOT_EINVAL && dname == NULL,
+ "%s: parse, NULL", __func__);
+ ok(knot_edns_chain_parse(&dname, (const uint8_t *)"\x01", 1, NULL) == KNOT_EMALF &&
+ dname == NULL, "%s: parse, malformed", __func__);
+}
+
+static void check_cookie_parse(const char *opt, knot_edns_cookie_t *cc,
+ knot_edns_cookie_t *sc, int code, const char *msg)
+{
+ const uint8_t *data = NULL;
+ uint16_t data_len = 0;
+ if (opt != NULL) {
+ data = knot_edns_opt_get_data((uint8_t *)opt);
+ data_len = knot_edns_opt_get_length((uint8_t *)opt);
+ }
+
+ int ret = knot_edns_cookie_parse(cc, sc, data, data_len);
+ is_int(code, ret, "cookie parse ret: %s", msg);
+}
+
+static void ok_cookie_check(const char *opt, knot_edns_cookie_t *cc,
+ knot_edns_cookie_t *sc, uint16_t cc_len, uint16_t sc_len,
+ const char *msg)
+{
+ check_cookie_parse(opt, cc, sc, KNOT_EOK, msg);
+
+ is_int(cc->len, cc_len, "cookie parse cc len: %s", msg);
+ is_int(sc->len, sc_len, "cookie parse cc len: %s", msg);
+
+ uint16_t size = knot_edns_cookie_size(cc, sc);
+ is_int(size, cc_len + sc_len, "cookie len: %s", msg);
+
+ uint8_t buf[64];
+ int ret = knot_edns_cookie_write(buf, sizeof(buf), cc, sc);
+ is_int(KNOT_EOK, ret, "cookie write ret: %s", msg);
+}
+
+static void test_cookie(void)
+{
+ const char *good[] = {
+ "\x00\x0a" "\x00\x08" "\x00\x01\x02\x03\x04\x05\x06\x07", /* Only client cookie. */
+ "\x00\x0a" "\x00\x10" "\x00\x01\x02\x03\x04\x05\x06\x07" "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f", /* 8 octets long server cookie. */
+ "\x00\x0a" "\x00\x28" "\x00\x01\x02\x03\x04\x05\x06\x07" "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27" /* 32 octets long server cookie. */
+ };
+
+ const char *bad[] = {
+ "\x00\x0a" "\x00\x00", /* Zero length cookie. */
+ "\x00\x0a" "\x00\x01" "\x00", /* Short client cookie. */
+ "\x00\x0a" "\x00\x07" "\x00\x01\x02\x03\x04\x05\x06", /* Short client cookie. */
+ "\x00\x0a" "\x00\x09" "\x00\x01\x02\x03\x04\x05\x06\x07" "\x08", /* Short server cookie. */
+ "\x00\x0a" "\x00\x0f" "\x00\x01\x02\x03\x04\x05\x06\x07" "\x08\x09\x0a\x0b\x0c\x0d\x0e", /* Short server cookie. */
+ "\x00\x0a" "\x00\x29" "\x00\x01\x02\x03\x04\x05\x06\x07" "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27\x28", /* Long server cookie. */
+ };
+
+ knot_edns_cookie_t cc, sc;
+
+ ok_cookie_check(good[0], &cc, &sc, 8, 0, "good cookie 0");
+ ok_cookie_check(good[1], &cc, &sc, 8, 8, "good cookie 1");
+ ok_cookie_check(good[2], &cc, &sc, 8, 32, "good cookie 2");
+
+ check_cookie_parse(NULL, &cc, &sc, KNOT_EINVAL, "no data");
+ check_cookie_parse(good[0], NULL, &sc, KNOT_EINVAL, "no client cookie");
+ check_cookie_parse(good[1], &cc, NULL, KNOT_EINVAL, "no server cookie");
+
+ check_cookie_parse(bad[0], &cc, &sc, KNOT_EMALF, "bad cookie 0");
+ check_cookie_parse(bad[1], &cc, &sc, KNOT_EMALF, "bad cookie 1");
+ check_cookie_parse(bad[2], &cc, &sc, KNOT_EMALF, "bad cookie 2");
+ check_cookie_parse(bad[3], &cc, &sc, KNOT_EMALF, "bad cookie 3");
+ check_cookie_parse(bad[4], &cc, &sc, KNOT_EMALF, "bad cookie 4");
+ check_cookie_parse(bad[5], &cc, &sc, KNOT_EMALF, "bad cookie 5");
+}
+
+int main(int argc, char *argv[])
+{
+ plan_lazy();
+
+ knot_rrset_t opt_rr;
+ int ret = knot_edns_init(&opt_rr, E_MAX_PLD, E_RCODE, E_VERSION, NULL);
+ is_int(KNOT_EOK, ret, "OPT RR: init");
+
+ /* Check initialized values (no NSID yet). */
+ check_header(&opt_rr, E_MAX_PLD, E_VERSION, 0, E_RCODE, "OPT RR: check header");
+
+ test_setters(&opt_rr);
+ test_getters(&opt_rr);
+ test_alignment();
+ test_keepalive();
+ test_chain();
+ test_cookie();
+
+ knot_rrset_clear(&opt_rr, NULL);
+
+ return 0;
+}
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