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edns.h (368129) edns.h (368693)
1/*
2 * util/edns.h - handle base EDNS options.
3 *
4 * Copyright (c) 2018, NLnet Labs. All rights reserved.
5 *
6 * This software is open source.
7 *
8 * Redistribution and use in source and binary forms, with or without

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45#include "util/storage/dnstree.h"
46
47struct edns_data;
48struct config_file;
49struct comm_point;
50struct regional;
51
52/**
1/*
2 * util/edns.h - handle base EDNS options.
3 *
4 * Copyright (c) 2018, NLnet Labs. All rights reserved.
5 *
6 * This software is open source.
7 *
8 * Redistribution and use in source and binary forms, with or without

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45#include "util/storage/dnstree.h"
46
47struct edns_data;
48struct config_file;
49struct comm_point;
50struct regional;
51
52/**
53 * Structure containing all EDNS tags.
53 * Structure containing all EDNS strings.
54 */
54 */
55struct edns_tags {
56 /** Tree of EDNS client tags to use in upstream queries, per address
57 * prefix. Contains nodes of type edns_tag_addr. */
58 rbtree_type client_tags;
59 /** EDNS opcode to use for client tags */
60 uint16_t client_tag_opcode;
55struct edns_strings {
56 /** Tree of EDNS client strings to use in upstream queries, per address
57 * prefix. Contains nodes of type edns_string_addr. */
58 rbtree_type client_strings;
59 /** EDNS opcode to use for client strings */
60 uint16_t client_string_opcode;
61 /** region to allocate tree nodes in */
62 struct regional* region;
63};
64
65/**
61 /** region to allocate tree nodes in */
62 struct regional* region;
63};
64
65/**
66 * EDNS tag. Node of rbtree, containing tag and prefix.
66 * EDNS string. Node of rbtree, containing string and prefix.
67 */
67 */
68struct edns_tag_addr {
68struct edns_string_addr {
69 /** node in address tree, used for tree lookups. Need to be the first
70 * member of this struct. */
71 struct addr_tree_node node;
69 /** node in address tree, used for tree lookups. Need to be the first
70 * member of this struct. */
71 struct addr_tree_node node;
72 /** tag data, in host byte ordering */
73 uint16_t tag_data;
72 /** string, ascii format */
73 uint8_t* string;
74 /** length of string */
75 size_t string_len;
74};
75
76/**
76};
77
78/**
77 * Create structure to hold EDNS tags
78 * @return: newly created edns_tags, NULL on alloc failure.
79 * Create structure to hold EDNS strings
80 * @return: newly created edns_strings, NULL on alloc failure.
79 */
81 */
80struct edns_tags* edns_tags_create(void);
82struct edns_strings* edns_strings_create(void);
81
83
82/** Delete EDNS tags structure
83 * @param edns_tags: struct to delete
84/** Delete EDNS strings structure
85 * @param edns_strings: struct to delete
84 */
86 */
85void edns_tags_delete(struct edns_tags* edns_tags);
87void edns_strings_delete(struct edns_strings* edns_strings);
86
87/**
88
89/**
88 * Add configured EDNS tags
89 * @param edns_tags: edns tags to apply config to
90 * @param config: struct containing EDNS tags configuration
90 * Add configured EDNS strings
91 * @param edns_strings: edns strings to apply config to
92 * @param config: struct containing EDNS strings configuration
91 * @return 0 on error
92 */
93 * @return 0 on error
94 */
93int edns_tags_apply_cfg(struct edns_tags* edns_tags,
95int edns_strings_apply_cfg(struct edns_strings* edns_strings,
94 struct config_file* config);
95
96/**
96 struct config_file* config);
97
98/**
97 * Find tag for address.
98 * @param tree: tree containing EDNS tags per address prefix.
99 * Find string for address.
100 * @param tree: tree containing EDNS strings per address prefix.
99 * @param addr: address to use for tree lookup
100 * @param addrlen: length of address
101 * @return: matching tree node, NULL otherwise
102 */
101 * @param addr: address to use for tree lookup
102 * @param addrlen: length of address
103 * @return: matching tree node, NULL otherwise
104 */
103struct edns_tag_addr*
104edns_tag_addr_lookup(rbtree_type* tree, struct sockaddr_storage* addr,
105struct edns_string_addr*
106edns_string_addr_lookup(rbtree_type* tree, struct sockaddr_storage* addr,
105 socklen_t addrlen);
106
107/**
108 * Apply common EDNS options.
109 *
110 * @param edns_out: initialised edns information with outbound edns.
111 * @param edns_in: initialised edns information with received edns.
112 * @param cfg: configuration.
113 * @param c: comm channel.
114 * @param region: the region to allocate the edns options in.
115 */
116int apply_edns_options(struct edns_data* edns_out, struct edns_data* edns_in,
117 struct config_file* cfg, struct comm_point* c, struct regional* region);
118
119#endif
107 socklen_t addrlen);
108
109/**
110 * Apply common EDNS options.
111 *
112 * @param edns_out: initialised edns information with outbound edns.
113 * @param edns_in: initialised edns information with received edns.
114 * @param cfg: configuration.
115 * @param c: comm channel.
116 * @param region: the region to allocate the edns options in.
117 */
118int apply_edns_options(struct edns_data* edns_out, struct edns_data* edns_in,
119 struct config_file* cfg, struct comm_point* c, struct regional* region);
120
121#endif