1 /* 2 * services/view.h - named views containing local zones authority service. 3 * 4 * Copyright (c) 2016, 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 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 15 * Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * Neither the name of the NLNET LABS nor the names of its contributors may 20 * be used to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /** 37 * \file 38 * 39 * This file contains functions to enable named views that can hold local zone 40 * authority service. 41 */ 42 43 #ifndef SERVICES_VIEW_H 44 #define SERVICES_VIEW_H 45 #include "util/rbtree.h" 46 #include "util/locks.h" 47 struct regional; 48 struct config_file; 49 struct config_view; 50 struct respip_set; 51 52 53 /** 54 * Views storage, shared. 55 */ 56 struct views { 57 /** lock on the view tree */ 58 lock_rw_type lock; 59 /** rbtree of struct view */ 60 rbtree_type vtree; 61 }; 62 63 /** 64 * View. Named structure holding local authority zones. 65 */ 66 struct view { 67 /** rbtree node, key is name */ 68 rbnode_type node; 69 /** view name. 70 * Has to be right after rbnode_t due to pointer arithmetic in 71 * view_create's lock protect */ 72 char* name; 73 /** view specific local authority zones */ 74 struct local_zones* local_zones; 75 /** response-ip configuration data for this view */ 76 struct respip_set* respip_set; 77 /** Fallback to global local_zones when there is no match in the view 78 * specific tree. 1 for yes, 0 for no */ 79 int isfirst; 80 /** lock on the data in the structure 81 * For the node and name you need to also hold the views_tree lock to 82 * change them. */ 83 lock_rw_type lock; 84 }; 85 86 87 /** 88 * Create views storage 89 * @return new struct or NULL on error. 90 */ 91 struct views* views_create(void); 92 93 /** 94 * Delete views storage 95 * @param v: views to delete. 96 */ 97 void views_delete(struct views* v); 98 99 /** 100 * Apply config settings; 101 * Takes care of locking. 102 * @param v: view is set up. 103 * @param cfg: config data. 104 * @return false on error. 105 */ 106 int views_apply_cfg(struct views* v, struct config_file* cfg); 107 108 /** 109 * Compare two view entries in rbtree. Sort canonical. 110 * @param v1: view 1 111 * @param v2: view 2 112 * @return: negative, positive or 0 comparison value. 113 */ 114 int view_cmp(const void* v1, const void* v2); 115 116 /** 117 * Delete one view 118 * @param v: view to delete. 119 */ 120 void view_delete(struct view* v); 121 122 /** 123 * Debug helper. Print all views 124 * Takes care of locking. 125 * @param v: the views tree 126 */ 127 void views_print(struct views* v); 128 129 /** 130 * Find a view by name. 131 * @param vs: views 132 * @param name: name of the view we are looking for 133 * @param write: 1 for obtaining write lock on found view, 0 for read lock 134 * @return: locked view or NULL. 135 */ 136 struct view* views_find_view(struct views* vs, const char* name, int write); 137 138 #endif /* SERVICES_VIEW_H */ 139