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/* Copyright (C) 2015 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 <stdint.h>
#include "libknot/attribute.h"
#include "libknot/rrtype/naptr.h"
#include "contrib/wire_ctx.h"
_public_
int knot_naptr_header_size(const uint8_t *naptr, const uint8_t *maxp)
{
if (!naptr || !maxp || naptr >= maxp) {
return KNOT_EINVAL;
}
wire_ctx_t wire = wire_ctx_init_const(naptr, maxp - naptr);
/* Fixed fields size (order, preference) */
wire_ctx_skip(&wire, 2 * sizeof(uint16_t));
/* Variable fields size (flags, services, regexp) */
for (int i = 0; i < 3; i++) {
uint8_t size = wire_ctx_read_u8(&wire);
wire_ctx_skip(&wire, size);
}
if (wire.error != KNOT_EOK) {
return KNOT_EMALF;
}
return wire_ctx_offset(&wire);
}
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