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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:36:22 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:36:22 +0000 |
commit | b88bb292821fd7742604ec4e280acebd9a049f62 (patch) | |
tree | 625e4e19e6619f7481e5a8103f876520950769f6 /src/libknot/packet/pkt.c | |
parent | Initial commit. (diff) | |
download | knot-b88bb292821fd7742604ec4e280acebd9a049f62.tar.xz knot-b88bb292821fd7742604ec4e280acebd9a049f62.zip |
Adding upstream version 3.0.5.upstream/3.0.5upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/libknot/packet/pkt.c | 825 |
1 files changed, 825 insertions, 0 deletions
diff --git a/src/libknot/packet/pkt.c b/src/libknot/packet/pkt.c new file mode 100644 index 0000000..ddda72e --- /dev/null +++ b/src/libknot/packet/pkt.c @@ -0,0 +1,825 @@ +/* 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 <assert.h> +#include <stdlib.h> +#include <stdbool.h> + +#include "libknot/attribute.h" +#include "libknot/packet/pkt.h" +#include "libknot/codes.h" +#include "libknot/descriptor.h" +#include "libknot/errcode.h" +#include "libknot/rrtype/tsig.h" +#include "libknot/tsig-op.h" +#include "libknot/packet/wire.h" +#include "libknot/packet/rrset-wire.h" +#include "libknot/wire.h" +#include "contrib/mempattern.h" +#include "contrib/wire_ctx.h" + +/*! \brief Packet RR array growth step. */ +#define NEXT_RR_ALIGN 16 +#define NEXT_RR_COUNT(count) (((count) / NEXT_RR_ALIGN + 1) * NEXT_RR_ALIGN) + +/*! \brief Scan packet for RRSet existence. */ +static bool pkt_contains(const knot_pkt_t *packet, const knot_rrset_t *rrset) +{ + assert(packet); + assert(rrset); + + for (int i = 0; i < packet->rrset_count; ++i) { + const uint16_t type = packet->rr[i].type; + const knot_rdata_t *data = packet->rr[i].rrs.rdata; + if (type == rrset->type && data == rrset->rrs.rdata) { + return true; + } + } + + return false; +} + +/*! \brief Free all RRSets and reset RRSet count. */ +static void pkt_free_data(knot_pkt_t *pkt) +{ + assert(pkt); + + /* Free RRSets if applicable. */ + for (uint16_t i = 0; i < pkt->rrset_count; ++i) { + if (pkt->rr_info[i].flags & KNOT_PF_FREE) { + knot_rrset_clear(&pkt->rr[i], &pkt->mm); + } + } + pkt->rrset_count = 0; + + /* Free EDNS option positions. */ + mm_free(&pkt->mm, pkt->edns_opts); + pkt->edns_opts = 0; +} + +/*! \brief Allocate new wireformat of given length, assuming *pkt is zeroed. */ +static int pkt_wire_alloc(knot_pkt_t *pkt, uint16_t len) +{ + assert(pkt); + + if (len < KNOT_WIRE_HEADER_SIZE) { + return KNOT_ERANGE; + } + + pkt->wire = mm_alloc(&pkt->mm, len); + if (pkt->wire == NULL) { + return KNOT_ENOMEM; + } + + pkt->flags |= KNOT_PF_FREE; + pkt->max_size = len; + + /* Reset to header size. */ + pkt->size = KNOT_WIRE_HEADER_SIZE; + memset(pkt->wire, 0, pkt->size); + + return KNOT_EOK; +} + +/*! \brief Set packet wireformat to an existing memory. */ +static void pkt_wire_set(knot_pkt_t *pkt, void *wire, uint16_t len) +{ + assert(pkt); + + pkt->wire = wire; + pkt->size = pkt->max_size = len; + pkt->parsed = 0; +} + +/*! \brief Calculate remaining size in the packet. */ +static uint16_t pkt_remaining(knot_pkt_t *pkt) +{ + assert(pkt); + + return pkt->max_size - pkt->size - pkt->reserved; +} + +/*! \brief Return RR count for given section (from wire xxCOUNT in header). */ +static uint16_t pkt_rr_wirecount(knot_pkt_t *pkt, knot_section_t section_id) +{ + assert(pkt); + switch (section_id) { + case KNOT_ANSWER: return knot_wire_get_ancount(pkt->wire); + case KNOT_AUTHORITY: return knot_wire_get_nscount(pkt->wire); + case KNOT_ADDITIONAL: return knot_wire_get_arcount(pkt->wire); + default: assert(0); return 0; + } +} + +/*! \brief Update RR count for given section (wire xxCOUNT in header). */ +static void pkt_rr_wirecount_add(knot_pkt_t *pkt, knot_section_t section_id, + int16_t val) +{ + assert(pkt); + switch (section_id) { + case KNOT_ANSWER: knot_wire_add_ancount(pkt->wire, val); break; + case KNOT_AUTHORITY: knot_wire_add_nscount(pkt->wire, val); break; + case KNOT_ADDITIONAL: knot_wire_add_arcount(pkt->wire, val); break; + } +} + +/*! \brief Reserve enough space in the RR arrays. */ +static int pkt_rr_array_alloc(knot_pkt_t *pkt, uint16_t count) +{ + /* Enough space. */ + if (pkt->rrset_allocd >= count) { + return KNOT_EOK; + } + + /* Allocate rr_info and rr fields to next size. */ + size_t next_size = NEXT_RR_COUNT(count); + knot_rrinfo_t *rr_info = mm_alloc(&pkt->mm, sizeof(knot_rrinfo_t) * next_size); + if (rr_info == NULL) { + return KNOT_ENOMEM; + } + + knot_rrset_t *rr = mm_alloc(&pkt->mm, sizeof(knot_rrset_t) * next_size); + if (rr == NULL) { + mm_free(&pkt->mm, rr_info); + return KNOT_ENOMEM; + } + + /* Copy the old data. */ + memcpy(rr_info, pkt->rr_info, pkt->rrset_allocd * sizeof(knot_rrinfo_t)); + memcpy(rr, pkt->rr, pkt->rrset_allocd * sizeof(knot_rrset_t)); + + /* Reassign and free old data. */ + mm_free(&pkt->mm, pkt->rr); + mm_free(&pkt->mm, pkt->rr_info); + pkt->rr = rr; + pkt->rr_info = rr_info; + pkt->rrset_allocd = next_size; + + return KNOT_EOK; +} + +static void compr_clear(knot_compr_t *compr) +{ + compr->rrinfo = NULL; + compr->suffix.pos = 0; + compr->suffix.labels = 0; +} + +/*! \brief Clear the packet and switch wireformat pointers (possibly allocate new). */ +static int pkt_init(knot_pkt_t *pkt, void *wire, uint16_t len, knot_mm_t *mm) +{ + assert(pkt); + + memset(pkt, 0, sizeof(knot_pkt_t)); + + /* No data to free, set memory context. */ + memcpy(&pkt->mm, mm, sizeof(knot_mm_t)); + + /* Initialize wire. */ + int ret = KNOT_EOK; + if (wire == NULL) { + ret = pkt_wire_alloc(pkt, len); + } else { + pkt_wire_set(pkt, wire, len); + } + + /* Initialize compression context (zeroed above). */ + pkt->compr.wire = pkt->wire; + + return ret; +} + +/*! \brief Reset packet parse state. */ +static void sections_reset(knot_pkt_t *pkt) +{ + pkt->current = KNOT_ANSWER; + memset(pkt->sections, 0, sizeof(pkt->sections)); + (void)knot_pkt_begin(pkt, KNOT_ANSWER); +} + +/*! \brief Allocate new packet using memory context. */ +static knot_pkt_t *pkt_new_mm(void *wire, uint16_t len, knot_mm_t *mm) +{ + assert(mm); + + knot_pkt_t *pkt = mm_alloc(mm, sizeof(knot_pkt_t)); + if (pkt == NULL) { + return NULL; + } + + if (pkt_init(pkt, wire, len, mm) != KNOT_EOK) { + mm_free(mm, pkt); + return NULL; + } + + return pkt; +} + +_public_ +knot_pkt_t *knot_pkt_new(void *wire, uint16_t len, knot_mm_t *mm) +{ + /* Default memory allocator if NULL. */ + knot_mm_t _mm; + if (mm == NULL) { + mm_ctx_init(&_mm); + mm = &_mm; + } + + return pkt_new_mm(wire, len, mm); +} + +static int append_tsig(knot_pkt_t *dst, const knot_pkt_t *src) +{ + /* Check if a wire TSIG is available. */ + if (src->tsig_wire.pos != NULL) { + if (dst->max_size < src->size + src->tsig_wire.len) { + return KNOT_ESPACE; + } + memcpy(dst->wire + dst->size, src->tsig_wire.pos, + src->tsig_wire.len); + dst->size += src->tsig_wire.len; + + /* Increment arcount. */ + knot_wire_set_arcount(dst->wire, + knot_wire_get_arcount(dst->wire) + 1); + } else { + return knot_tsig_append(dst->wire, &dst->size, dst->max_size, + src->tsig_rr); + } + + return KNOT_EOK; +} + +_public_ +int knot_pkt_copy(knot_pkt_t *dst, const knot_pkt_t *src) +{ + if (dst == NULL || src == NULL) { + return KNOT_EINVAL; + } + + if (dst->max_size < src->size) { + return KNOT_ESPACE; + } + memcpy(dst->wire, src->wire, src->size); + dst->size = src->size; + + /* Append TSIG record. */ + if (src->tsig_rr) { + int ret = append_tsig(dst, src); + if (ret != KNOT_EOK) { + return ret; + } + } + + /* Invalidate arrays. */ + dst->rr = NULL; + dst->rr_info = NULL; + dst->rrset_count = 0; + dst->rrset_allocd = 0; + + /* @note This could be done more effectively if needed. */ + return knot_pkt_parse(dst, 0); +} + +static void payload_clear(knot_pkt_t *pkt) +{ + assert(pkt); + + /* Keep question. */ + pkt->parsed = 0; + pkt->reserved = 0; + + /* Free RRSets if applicable. */ + pkt_free_data(pkt); + + /* Reset sections. */ + sections_reset(pkt); + + /* Reset special types. */ + pkt->opt_rr = NULL; + pkt->tsig_rr = NULL; + + /* Reset TSIG wire reference. */ + pkt->tsig_wire.pos = NULL; + pkt->tsig_wire.len = 0; +} + +_public_ +int knot_pkt_init_response(knot_pkt_t *pkt, const knot_pkt_t *query) +{ + if (pkt == NULL || query == NULL) { + return KNOT_EINVAL; + } + + /* Header + question size. */ + size_t base_size = KNOT_WIRE_HEADER_SIZE + knot_pkt_question_size(query); + if (base_size > pkt->max_size) { + return KNOT_ESPACE; + } + + pkt->size = base_size; + memcpy(pkt->wire, query->wire, base_size); + + pkt->qname_size = query->qname_size; + if (query->qname_size == 0) { + /* Reset question count if malformed. */ + knot_wire_set_qdcount(pkt->wire, 0); + } + + /* Update flags and section counters. */ + knot_wire_set_ancount(pkt->wire, 0); + knot_wire_set_nscount(pkt->wire, 0); + knot_wire_set_arcount(pkt->wire, 0); + + knot_wire_set_qr(pkt->wire); + knot_wire_clear_tc(pkt->wire); + knot_wire_clear_ad(pkt->wire); + knot_wire_clear_ra(pkt->wire); + knot_wire_clear_aa(pkt->wire); + knot_wire_clear_z(pkt->wire); + + /* Clear payload. */ + payload_clear(pkt); + + /* Clear compression context. */ + compr_clear(&pkt->compr); + + return KNOT_EOK; +} + +_public_ +void knot_pkt_clear(knot_pkt_t *pkt) +{ + if (pkt == NULL) { + return; + } + + /* Reset to header size. */ + pkt->size = KNOT_WIRE_HEADER_SIZE; + memset(pkt->wire, 0, pkt->size); + + /* Clear payload. */ + payload_clear(pkt); + + /* Clear compression context. */ + compr_clear(&pkt->compr); +} + +_public_ +void knot_pkt_free(knot_pkt_t *pkt) +{ + if (pkt == NULL) { + return; + } + + /* Free temporary RRSets. */ + pkt_free_data(pkt); + + /* Free RR/RR info arrays. */ + mm_free(&pkt->mm, pkt->rr); + mm_free(&pkt->mm, pkt->rr_info); + + /* Free the space for wireformat. */ + if (pkt->flags & KNOT_PF_FREE) { + mm_free(&pkt->mm, pkt->wire); + } + + mm_free(&pkt->mm, pkt); +} + +_public_ +int knot_pkt_reserve(knot_pkt_t *pkt, uint16_t size) +{ + if (pkt == NULL) { + return KNOT_EINVAL; + } + + /* Reserve extra space (if possible). */ + if (pkt_remaining(pkt) >= size) { + pkt->reserved += size; + return KNOT_EOK; + } else { + return KNOT_ERANGE; + } +} + +_public_ +int knot_pkt_reclaim(knot_pkt_t *pkt, uint16_t size) +{ + if (pkt == NULL) { + return KNOT_EINVAL; + } + + if (pkt->reserved >= size) { + pkt->reserved -= size; + return KNOT_EOK; + } else { + return KNOT_ERANGE; + } +} + +_public_ +int knot_pkt_begin(knot_pkt_t *pkt, knot_section_t section_id) +{ + if (pkt == NULL || section_id < pkt->current) { + return KNOT_EINVAL; + } + + /* Remember watermark but not on repeated calls. */ + pkt->sections[section_id].pkt = pkt; + if (section_id > pkt->current) { + pkt->sections[section_id].pos = pkt->rrset_count; + } + + pkt->current = section_id; + + return KNOT_EOK; +} + +_public_ +int knot_pkt_put_question(knot_pkt_t *pkt, const knot_dname_t *qname, uint16_t qclass, uint16_t qtype) +{ + if (pkt == NULL || qname == NULL) { + return KNOT_EINVAL; + } + + assert(pkt->size == KNOT_WIRE_HEADER_SIZE); + assert(pkt->rrset_count == 0); + + /* Copy name wireformat. */ + wire_ctx_t wire = wire_ctx_init(pkt->wire, pkt->max_size); + wire_ctx_set_offset(&wire, KNOT_WIRE_HEADER_SIZE); + + int qname_len = knot_dname_to_wire(wire.position, + qname, wire_ctx_available(&wire)); + if (qname_len < 0) { + return qname_len; + } + wire_ctx_skip(&wire, qname_len); + + /* Copy QTYPE & QCLASS */ + wire_ctx_write_u16(&wire, qtype); + wire_ctx_write_u16(&wire, qclass); + + /* Check errors. */ + if (wire.error != KNOT_EOK) { + return wire.error; + } + + /* Update question count and sizes. */ + knot_wire_set_qdcount(pkt->wire, 1); + pkt->size = wire_ctx_offset(&wire); + pkt->qname_size = qname_len; + + /* Start writing ANSWER. */ + return knot_pkt_begin(pkt, KNOT_ANSWER); +} + +_public_ +int knot_pkt_put_rotate(knot_pkt_t *pkt, uint16_t compr_hint, const knot_rrset_t *rr, + uint16_t rotate, uint16_t flags) +{ + if (pkt == NULL || rr == NULL) { + return KNOT_EINVAL; + } + + /* Reserve memory for RR descriptors. */ + int ret = pkt_rr_array_alloc(pkt, pkt->rrset_count + 1); + if (ret != KNOT_EOK) { + return ret; + } + + /* Check for double insertion. */ + if ((flags & KNOT_PF_CHECKDUP) && pkt_contains(pkt, rr)) { + return KNOT_EOK; + } + + knot_rrinfo_t *rrinfo = &pkt->rr_info[pkt->rrset_count]; + memset(rrinfo, 0, sizeof(knot_rrinfo_t)); + rrinfo->pos = pkt->size; + rrinfo->flags = flags; + rrinfo->compress_ptr[0] = compr_hint; + memcpy(pkt->rr + pkt->rrset_count, rr, sizeof(knot_rrset_t)); + + /* Disable compression if no QNAME is available. */ + knot_compr_t *compr = NULL; + if (knot_pkt_qname(pkt) != NULL) { + /* Initialize compression context if it did not happen yet. */ + pkt->compr.rrinfo = rrinfo; + if (pkt->compr.suffix.pos == 0) { + pkt->compr.suffix.pos = KNOT_WIRE_HEADER_SIZE; + pkt->compr.suffix.labels = + knot_dname_labels(pkt->compr.wire + pkt->compr.suffix.pos, + pkt->compr.wire); + } + + compr = &pkt->compr; + } + + uint8_t *pos = pkt->wire + pkt->size; + size_t maxlen = pkt_remaining(pkt); + + /* Write RRSet to wireformat. */ + ret = knot_rrset_to_wire_extra(rr, pos, maxlen, rotate, compr, flags); + if (ret < 0) { + /* Truncate packet if required. */ + if (ret == KNOT_ESPACE && !(flags & KNOT_PF_NOTRUNC)) { + knot_wire_set_tc(pkt->wire); + } + return ret; + } + + size_t len = ret; + uint16_t rr_added = rr->rrs.count; + + /* Keep reference to special types. */ + if (rr->type == KNOT_RRTYPE_OPT) { + pkt->opt_rr = &pkt->rr[pkt->rrset_count]; + } + + if (rr_added > 0) { + pkt->rrset_count += 1; + pkt->sections[pkt->current].count += 1; + pkt->size += len; + pkt_rr_wirecount_add(pkt, pkt->current, rr_added); + } + + return KNOT_EOK; +} + +_public_ +int knot_pkt_parse_question(knot_pkt_t *pkt) +{ + if (pkt == NULL) { + return KNOT_EINVAL; + } + + /* Check at least header size. */ + if (pkt->size < KNOT_WIRE_HEADER_SIZE) { + return KNOT_EMALF; + } + + /* We have at least some DNS header. */ + pkt->parsed = KNOT_WIRE_HEADER_SIZE; + + /* Check QD count. */ + uint16_t qd = knot_wire_get_qdcount(pkt->wire); + if (qd > 1) { + return KNOT_EMALF; + } + + /* No question. */ + if (qd == 0) { + pkt->qname_size = 0; + return KNOT_EOK; + } + + /* Process question. */ + int len = knot_dname_wire_check(pkt->wire + pkt->parsed, + pkt->wire + pkt->size, + NULL /* No compression in QNAME. */); + if (len <= 0) { + return KNOT_EMALF; + } + + /* Check QCLASS/QTYPE size. */ + uint16_t question_size = len + 2 * sizeof(uint16_t); /* QCLASS + QTYPE */ + if (pkt->parsed + question_size > pkt->size) { + return KNOT_EMALF; + } + + pkt->parsed += question_size; + pkt->qname_size = len; + + return KNOT_EOK; +} + +/*! \brief Check constraints (position, uniqueness, validity) for special types + * (TSIG, OPT). + */ +static int check_rr_constraints(knot_pkt_t *pkt, knot_rrset_t *rr, size_t rr_size, + unsigned flags) +{ + switch (rr->type) { + case KNOT_RRTYPE_TSIG: + if (pkt->current != KNOT_ADDITIONAL || pkt->tsig_rr != NULL || + !knot_tsig_rdata_is_ok(rr)) { + return KNOT_EMALF; + } + + /* Strip TSIG RR from wireformat and decrease ARCOUNT. */ + if (!(flags & KNOT_PF_KEEPWIRE)) { + pkt->parsed -= rr_size; + pkt->size -= rr_size; + pkt->tsig_wire.pos = pkt->wire + pkt->parsed; + pkt->tsig_wire.len = rr_size; + knot_wire_set_arcount(pkt->wire, knot_wire_get_arcount(pkt->wire) - 1); + } + + pkt->tsig_rr = rr; + break; + case KNOT_RRTYPE_OPT: + if (pkt->current != KNOT_ADDITIONAL || pkt->opt_rr != NULL || + knot_edns_get_options(rr, &pkt->edns_opts, &pkt->mm) != KNOT_EOK) { + return KNOT_EMALF; + } + + pkt->opt_rr = rr; + break; + default: + break; + } + + return KNOT_EOK; +} + +static int parse_rr(knot_pkt_t *pkt, unsigned flags) +{ + assert(pkt); + + if (pkt->parsed >= pkt->size) { + return KNOT_EFEWDATA; + } + + /* Reserve memory for RR descriptors. */ + int ret = pkt_rr_array_alloc(pkt, pkt->rrset_count + 1); + if (ret != KNOT_EOK) { + return ret; + } + + /* Initialize RR info. */ + memset(&pkt->rr_info[pkt->rrset_count], 0, sizeof(knot_rrinfo_t)); + pkt->rr_info[pkt->rrset_count].pos = pkt->parsed; + pkt->rr_info[pkt->rrset_count].flags = KNOT_PF_FREE; + + /* Parse wire format. */ + size_t rr_size = pkt->parsed; + knot_rrset_t *rr = &pkt->rr[pkt->rrset_count]; + ret = knot_rrset_rr_from_wire(pkt->wire, &pkt->parsed, pkt->size, + rr, &pkt->mm, !(flags & KNOT_PF_NOCANON)); + if (ret != KNOT_EOK) { + return ret; + } + + /* Calculate parsed RR size from before/after parsing. */ + rr_size = (pkt->parsed - rr_size); + + /* Update packet RRSet count. */ + ++pkt->rrset_count; + ++pkt->sections[pkt->current].count; + + /* Check special RRs (OPT and TSIG). */ + return check_rr_constraints(pkt, rr, rr_size, flags); +} + +static int parse_section(knot_pkt_t *pkt, unsigned flags) +{ + assert(pkt); + + uint16_t rr_parsed = 0; + uint16_t rr_count = pkt_rr_wirecount(pkt, pkt->current); + + /* Parse all RRs belonging to the section. */ + for (rr_parsed = 0; rr_parsed < rr_count; ++rr_parsed) { + int ret = parse_rr(pkt, flags); + if (ret != KNOT_EOK) { + return ret; + } + } + + return KNOT_EOK; +} + +static int parse_payload(knot_pkt_t *pkt, unsigned flags) +{ + assert(pkt); + assert(pkt->wire); + assert(pkt->size > 0); + + /* Reserve memory in advance to avoid resizing. */ + size_t rr_count = knot_wire_get_ancount(pkt->wire) + + knot_wire_get_nscount(pkt->wire) + + knot_wire_get_arcount(pkt->wire); + + if (rr_count > pkt->size / KNOT_WIRE_RR_MIN_SIZE) { + return KNOT_EMALF; + } + + int ret = pkt_rr_array_alloc(pkt, rr_count); + if (ret != KNOT_EOK) { + return ret; + } + + for (knot_section_t i = KNOT_ANSWER; i <= KNOT_ADDITIONAL; ++i) { + ret = knot_pkt_begin(pkt, i); + if (ret != KNOT_EOK) { + return ret; + } + ret = parse_section(pkt, flags); + if (ret != KNOT_EOK) { + return ret; + } + } + + /* TSIG must be last record of AR if present. */ + const knot_pktsection_t *ar = knot_pkt_section(pkt, KNOT_ADDITIONAL); + if (pkt->tsig_rr != NULL) { + const knot_rrset_t *last_rr = knot_pkt_rr(ar, ar->count - 1); + if (ar->count > 0 && pkt->tsig_rr->rrs.rdata != last_rr->rrs.rdata) { + return KNOT_EMALF; + } + } + + /* Check for trailing garbage. */ + if (pkt->parsed < pkt->size) { + return KNOT_ETRAIL; + } + + return KNOT_EOK; +} + +_public_ +int knot_pkt_parse(knot_pkt_t *pkt, unsigned flags) +{ + if (pkt == NULL) { + return KNOT_EINVAL; + } + + /* Reset parse state. */ + sections_reset(pkt); + + int ret = knot_pkt_parse_question(pkt); + if (ret == KNOT_EOK) { + ret = parse_payload(pkt, flags); + } + + return ret; +} + +_public_ +uint16_t knot_pkt_ext_rcode(const knot_pkt_t *pkt) +{ + if (pkt == NULL) { + return 0; + } + + /* Get header RCODE. */ + uint16_t rcode = knot_wire_get_rcode(pkt->wire); + + /* Update to extended RCODE if EDNS is available. */ + if (pkt->opt_rr != NULL) { + uint8_t opt_rcode = knot_edns_get_ext_rcode(pkt->opt_rr); + rcode = knot_edns_whole_rcode(opt_rcode, rcode); + } + + /* Return if not NOTAUTH. */ + if (rcode != KNOT_RCODE_NOTAUTH) { + return rcode; + } + + /* Get TSIG RCODE. */ + uint16_t tsig_rcode = KNOT_RCODE_NOERROR; + if (pkt->tsig_rr != NULL) { + tsig_rcode = knot_tsig_rdata_error(pkt->tsig_rr); + } + + /* Return proper RCODE. */ + if (tsig_rcode != KNOT_RCODE_NOERROR) { + return tsig_rcode; + } else { + return rcode; + } +} + +_public_ +const char *knot_pkt_ext_rcode_name(const knot_pkt_t *pkt) +{ + if (pkt == NULL) { + return ""; + } + + uint16_t rcode = knot_pkt_ext_rcode(pkt); + + const knot_lookup_t *item = NULL; + if (pkt->tsig_rr != NULL) { + item = knot_lookup_by_id(knot_tsig_rcode_names, rcode); + } + if (item == NULL) { + item = knot_lookup_by_id(knot_rcode_names, rcode); + } + + return (item != NULL) ? item->name : ""; +} |