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Diffstat (limited to 'src/libknot/rrtype/naptr.c')
-rw-r--r-- | src/libknot/rrtype/naptr.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/libknot/rrtype/naptr.c b/src/libknot/rrtype/naptr.c new file mode 100644 index 0000000..9307816 --- /dev/null +++ b/src/libknot/rrtype/naptr.c @@ -0,0 +1,47 @@ +/* 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); +} |