122 lines
3.9 KiB
C
122 lines
3.9 KiB
C
/*
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* util/edns.h - handle base EDNS options.
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*
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* Copyright (c) 2018, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions for base EDNS options.
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*/
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#ifndef UTIL_EDNS_H
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#define UTIL_EDNS_H
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#include "util/storage/dnstree.h"
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struct edns_data;
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struct config_file;
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struct comm_point;
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struct regional;
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/**
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* Structure containing all EDNS strings.
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*/
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struct edns_strings {
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/** Tree of EDNS client strings to use in upstream queries, per address
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* prefix. Contains nodes of type edns_string_addr. */
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rbtree_type client_strings;
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/** EDNS opcode to use for client strings */
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uint16_t client_string_opcode;
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/** region to allocate tree nodes in */
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struct regional* region;
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};
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/**
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* EDNS string. Node of rbtree, containing string and prefix.
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*/
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struct edns_string_addr {
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/** node in address tree, used for tree lookups. Need to be the first
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* member of this struct. */
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struct addr_tree_node node;
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/** string, ascii format */
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uint8_t* string;
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/** length of string */
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size_t string_len;
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};
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/**
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* Create structure to hold EDNS strings
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* @return: newly created edns_strings, NULL on alloc failure.
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*/
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struct edns_strings* edns_strings_create(void);
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/** Delete EDNS strings structure
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* @param edns_strings: struct to delete
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*/
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void edns_strings_delete(struct edns_strings* edns_strings);
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/**
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* Add configured EDNS strings
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* @param edns_strings: edns strings to apply config to
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* @param config: struct containing EDNS strings configuration
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* @return 0 on error
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*/
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int edns_strings_apply_cfg(struct edns_strings* edns_strings,
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struct config_file* config);
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/**
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* Find string for address.
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* @param tree: tree containing EDNS strings per address prefix.
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* @param addr: address to use for tree lookup
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* @param addrlen: length of address
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* @return: matching tree node, NULL otherwise
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*/
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struct edns_string_addr*
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edns_string_addr_lookup(rbtree_type* tree, struct sockaddr_storage* addr,
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socklen_t addrlen);
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/**
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* Apply common EDNS options.
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*
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* @param edns_out: initialised edns information with outbound edns.
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* @param edns_in: initialised edns information with received edns.
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* @param cfg: configuration.
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* @param c: comm channel.
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* @param region: the region to allocate the edns options in.
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*/
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int apply_edns_options(struct edns_data* edns_out, struct edns_data* edns_in,
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struct config_file* cfg, struct comm_point* c, struct regional* region);
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#endif
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