1 /*
2 * services/view.c - 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 #include "config.h"
43 #include "services/view.h"
44 #include "services/localzone.h"
45 #include "util/config_file.h"
46
47 int
view_cmp(const void * v1,const void * v2)48 view_cmp(const void* v1, const void* v2)
49 {
50 struct view* a = (struct view*)v1;
51 struct view* b = (struct view*)v2;
52
53 return strcmp(a->name, b->name);
54 }
55
56 struct views*
views_create(void)57 views_create(void)
58 {
59 struct views* v = (struct views*)calloc(1,
60 sizeof(*v));
61 if(!v)
62 return NULL;
63 rbtree_init(&v->vtree, &view_cmp);
64 lock_rw_init(&v->lock);
65 lock_protect(&v->lock, &v->vtree, sizeof(v->vtree));
66 return v;
67 }
68
69 /* \noop (ignore this comment for doxygen)
70 * This prototype is defined in in respip.h, but we want to avoid
71 * unnecessary dependencies */
72 void respip_set_delete(struct respip_set *set);
73
74 void
view_delete(struct view * v)75 view_delete(struct view* v)
76 {
77 if(!v)
78 return;
79 lock_rw_destroy(&v->lock);
80 local_zones_delete(v->local_zones);
81 respip_set_delete(v->respip_set);
82 free(v->name);
83 free(v);
84 }
85
86 static void
delviewnode(rbnode_type * n,void * ATTR_UNUSED (arg))87 delviewnode(rbnode_type* n, void* ATTR_UNUSED(arg))
88 {
89 struct view* v = (struct view*)n;
90 view_delete(v);
91 }
92
93 void
views_delete(struct views * v)94 views_delete(struct views* v)
95 {
96 if(!v)
97 return;
98 lock_rw_destroy(&v->lock);
99 traverse_postorder(&v->vtree, delviewnode, NULL);
100 free(v);
101 }
102
103 /** create a new view */
104 static struct view*
view_create(char * name)105 view_create(char* name)
106 {
107 struct view* v = (struct view*)calloc(1, sizeof(*v));
108 if(!v)
109 return NULL;
110 v->node.key = v;
111 if(!(v->name = strdup(name))) {
112 free(v);
113 return NULL;
114 }
115 lock_rw_init(&v->lock);
116 lock_protect(&v->lock, &v->name, sizeof(*v)-sizeof(rbnode_type));
117 return v;
118 }
119
120 /** enter a new view returns with WRlock */
121 static struct view*
views_enter_view_name(struct views * vs,char * name)122 views_enter_view_name(struct views* vs, char* name)
123 {
124 struct view* v = view_create(name);
125 if(!v) {
126 log_err("out of memory");
127 return NULL;
128 }
129
130 /* add to rbtree */
131 lock_rw_wrlock(&vs->lock);
132 lock_rw_wrlock(&v->lock);
133 if(!rbtree_insert(&vs->vtree, &v->node)) {
134 log_warn("duplicate view: %s", name);
135 lock_rw_unlock(&v->lock);
136 view_delete(v);
137 lock_rw_unlock(&vs->lock);
138 return NULL;
139 }
140 lock_rw_unlock(&vs->lock);
141 return v;
142 }
143
144 int
views_apply_cfg(struct views * vs,struct config_file * cfg)145 views_apply_cfg(struct views* vs, struct config_file* cfg)
146 {
147 struct config_view* cv;
148 struct view* v;
149 struct config_file lz_cfg;
150 /* Check existence of name in first view (last in config). Rest of
151 * views are already checked when parsing config. */
152 if(cfg->views && !cfg->views->name) {
153 log_err("view without a name");
154 return 0;
155 }
156 for(cv = cfg->views; cv; cv = cv->next) {
157 /* create and enter view */
158 if(!(v = views_enter_view_name(vs, cv->name)))
159 return 0;
160 v->isfirst = cv->isfirst;
161 if(cv->local_zones || cv->local_data) {
162 if(!(v->local_zones = local_zones_create())){
163 lock_rw_unlock(&v->lock);
164 return 0;
165 }
166 memset(&lz_cfg, 0, sizeof(lz_cfg));
167 lz_cfg.local_zones = cv->local_zones;
168 lz_cfg.local_data = cv->local_data;
169 lz_cfg.local_zones_nodefault =
170 cv->local_zones_nodefault;
171 if(v->isfirst) {
172 /* Do not add defaults to view-specific
173 * local-zone when global local zone will be
174 * used. */
175 struct config_strlist* nd;
176 lz_cfg.local_zones_disable_default = 1;
177 /* Add nodefault zones to list of zones to add,
178 * so they will be used as if they are
179 * configured as type transparent */
180 for(nd = cv->local_zones_nodefault; nd;
181 nd = nd->next) {
182 char* nd_str, *nd_type;
183 nd_str = strdup(nd->str);
184 if(!nd_str) {
185 log_err("out of memory");
186 lock_rw_unlock(&v->lock);
187 return 0;
188 }
189 nd_type = strdup("nodefault");
190 if(!nd_type) {
191 log_err("out of memory");
192 free(nd_str);
193 lock_rw_unlock(&v->lock);
194 return 0;
195 }
196 if(!cfg_str2list_insert(
197 &lz_cfg.local_zones, nd_str,
198 nd_type)) {
199 log_err("failed to insert "
200 "default zones into "
201 "local-zone list");
202 lock_rw_unlock(&v->lock);
203 return 0;
204 }
205 }
206 }
207 if(!local_zones_apply_cfg(v->local_zones, &lz_cfg)){
208 lock_rw_unlock(&v->lock);
209 return 0;
210 }
211 /* local_zones, local_zones_nodefault and local_data
212 * are free'd from config_view by local_zones_apply_cfg.
213 * Set pointers to NULL. */
214 cv->local_zones = NULL;
215 cv->local_data = NULL;
216 cv->local_zones_nodefault = NULL;
217 }
218 lock_rw_unlock(&v->lock);
219 }
220 return 1;
221 }
222
223 /** find a view by name */
224 struct view*
views_find_view(struct views * vs,const char * name,int write)225 views_find_view(struct views* vs, const char* name, int write)
226 {
227 struct view* v;
228 struct view key;
229 key.node.key = &v;
230 key.name = (char *)name;
231 lock_rw_rdlock(&vs->lock);
232 if(!(v = (struct view*)rbtree_search(&vs->vtree, &key.node))) {
233 lock_rw_unlock(&vs->lock);
234 return 0;
235 }
236 if(write) {
237 lock_rw_wrlock(&v->lock);
238 } else {
239 lock_rw_rdlock(&v->lock);
240 }
241 lock_rw_unlock(&vs->lock);
242 return v;
243 }
244
views_print(struct views * v)245 void views_print(struct views* v)
246 {
247 /* TODO implement print */
248 (void)v;
249 }
250