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Diffstat (limited to 'src/knot/dnssec/nsec-chain.h')
| -rw-r--r-- | src/knot/dnssec/nsec-chain.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/knot/dnssec/nsec-chain.h b/src/knot/dnssec/nsec-chain.h new file mode 100644 index 0000000..a2f102e --- /dev/null +++ b/src/knot/dnssec/nsec-chain.h @@ -0,0 +1,151 @@ +/* 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 <http://www.gnu.org/licenses/>. + */ + +#pragma once + +#include <assert.h> +#include <stdbool.h> +#include <stdint.h> + +#include "knot/zone/contents.h" +#include "knot/updates/changesets.h" +#include "libdnssec/nsec.h" + +/*! + * \brief Parameters to be used in connect_nsec_nodes callback. + */ +typedef struct { + uint32_t ttl; // TTL for NSEC(3) records + changeset_t *changeset; // Changeset for NSEC(3) changes + const zone_contents_t *zone; // Updated zone +} nsec_chain_iterate_data_t; + +/*! + * \brief Used to control changeset iteration functions. + */ +enum { + NSEC_NODE_SKIP = 1, +}; + +/*! + * \brief Callback used when creating NSEC chains. + */ +typedef int (*chain_iterate_create_cb)(zone_node_t *, zone_node_t *, + nsec_chain_iterate_data_t *); + +/*! + * \brief Add all RR types from a node into the bitmap. + */ +inline static void bitmap_add_node_rrsets(dnssec_nsec_bitmap_t *bitmap, + enum knot_rr_type nsec_type, + const zone_node_t *node) +{ + bool deleg = node->flags & NODE_FLAGS_DELEG; + bool apex = node->parent == NULL; + for (int i = 0; i < node->rrset_count; i++) { + knot_rrset_t rr = node_rrset_at(node, i); + if (deleg && (rr.type != KNOT_RRTYPE_NS && rr.type != KNOT_RRTYPE_DS)) { + continue; + } + if (rr.type == KNOT_RRTYPE_NSEC || rr.type == KNOT_RRTYPE_RRSIG) { + continue; + } + // NSEC3PARAM in zone apex is maintained automatically + if (apex && rr.type == KNOT_RRTYPE_NSEC3PARAM && nsec_type != KNOT_RRTYPE_NSEC3) { + continue; + } + + dnssec_nsec_bitmap_add(bitmap, rr.type); + } +} + +/*! + * \brief Call a function for each piece of the chain formed by sorted nodes. + * + * \note If the callback function returns anything other than KNOT_EOK, the + * iteration is terminated and the error code is propagated. + * + * \param nodes Zone nodes. + * \param callback Callback function. + * \param data Custom data supplied to the callback function. + * + * \return Error code, KNOT_EOK if successful. + */ +int knot_nsec_chain_iterate_create(zone_tree_t *nodes, + chain_iterate_create_cb callback, + nsec_chain_iterate_data_t *data); + +/*! + * \brief Call the chain-connecting function for modified records and their neighbours. + * + * \param old_nodes Old state of zone nodes. + * \param new_nodes New state of zone nodes. + * \param callback Callback function. + * \param data Custom data supplied, incl. changeset to be updated. + * + * \retval KNOT_ENORECORD if the chain must be recreated from scratch. + * \return KNOT_E* + */ +int knot_nsec_chain_iterate_fix(zone_tree_t *old_nodes, zone_tree_t *new_nodes, + chain_iterate_create_cb callback, + nsec_chain_iterate_data_t *data); + +/*! + * \brief Add entry for removed NSEC(3) and its RRSIG to the changeset. + * + * \param n Node to extract NSEC(3) from. + * \param changeset Changeset to add the old RR into. + * + * \return Error code, KNOT_EOK if successful. + */ +int knot_nsec_changeset_remove(const zone_node_t *n, changeset_t *changeset); + +/*! + * \brief Checks whether the node is empty or eventually contains only NSEC and + * RRSIGs. + * + * \param n Node to check. + * + * \retval true if the node is empty or contains only NSEC and RRSIGs. + * \retval false otherwise. + */ +bool knot_nsec_empty_nsec_and_rrsigs_in_node(const zone_node_t *n); + +/*! + * \brief Create new NSEC chain, add differences from current into a changeset. + * + * \param zone Zone. + * \param ttl TTL for created NSEC records. + * \param changeset Changeset the differences will be put into. + * + * \return Error code, KNOT_EOK if successful. + */ +int knot_nsec_create_chain(const zone_contents_t *zone, uint32_t ttl, + changeset_t *changeset); + +/*! + * \brief Fix existing NSEC chain to cover the changes in zone contents. + * + * \param old_zone Old zone contents. + * \param new_zone New zone contents. + * \param ttl TTL for created NSEC records. + * \param changeset Changeset the differences will be put into. + * + * \retval KNOT_ENORECORD if the chain must be recreated from scratch. + * \return KNOT_E* + */ +int knot_nsec_fix_chain(const zone_contents_t *old_zone, const zone_contents_t *new_zone, + uint32_t ttl, changeset_t *changeset); |