1/*
2 * iterator/iter_priv.c - iterative resolver private address and domain store
3 *
4 * Copyright (c) 2008, 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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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 LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36/**
37 * \file
38 *
39 * This file contains functions to assist the iterator module.
40 * Keep track of the private addresses and lookup fast.
41 */
42
43#include "config.h"
44#include <ldns/dname.h>
45#include "iterator/iter_priv.h"
46#include "util/regional.h"
47#include "util/log.h"
48#include "util/config_file.h"
49#include "util/data/dname.h"
50#include "util/data/msgparse.h"
51#include "util/net_help.h"
52#include "util/storage/dnstree.h"
53
54struct iter_priv* priv_create(void)
55{
56 struct iter_priv* priv = (struct iter_priv*)calloc(1, sizeof(*priv));
57 if(!priv)
58 return NULL;
59 priv->region = regional_create();
60 if(!priv->region) {

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105}
106
107/** Read private-domain declarations from config */
108static int read_names(struct iter_priv* priv, struct config_file* cfg)
109{
110 /* parse names, report errors, insert into tree */
111 struct config_strlist* p;
112 struct name_tree_node* n;
113 uint8_t* nm;
114 size_t nm_len;
115 int nm_labs;
116 ldns_rdf* rdf;
117
118 for(p = cfg->private_domain; p; p = p->next) {
119 log_assert(p->str);
120 rdf = ldns_dname_new_frm_str(p->str);
121 if(!rdf) {
122 log_err("cannot parse private-domain: %s", p->str);
123 return 0;
124 }
125 nm = ldns_rdf_data(rdf);
126 nm_labs = dname_count_size_labels(nm, &nm_len);
127 nm = (uint8_t*)regional_alloc_init(priv->region, nm, nm_len);
128 ldns_rdf_deep_free(rdf);
129 if(!nm) {
130 log_err("out of memory");
131 return 0;
132 }
133 n = (struct name_tree_node*)regional_alloc(priv->region,
134 sizeof(*n));
135 if(!n) {
136 log_err("out of memory");
137 return 0;
138 }
139 if(!name_tree_insert(&priv->n, n, nm, nm_len, nm_labs,
140 LDNS_RR_CLASS_IN)) {
141 verbose(VERB_QUERY, "ignoring duplicate "
142 "private-domain: %s", p->str);
143 }
144 }
145 return 1;
146}
147

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183 * @param priv: structure for address storage.
184 * @param pkt: the packet (for compression ptrs).
185 * @param name: name to check.
186 * @param name_len: uncompressed length of the name to check.
187 * @param dclass: class to check.
188 * @return: true if the name is OK. false if unlisted.
189 */
190static int
191priv_lookup_name(struct iter_priv* priv, ldns_buffer* pkt,
192 uint8_t* name, size_t name_len, uint16_t dclass)
193{
194 size_t len;
195 uint8_t decomp[256];
196 int labs;
197 if(name_len >= sizeof(decomp))
198 return 0;
199 dname_pkt_copy(pkt, decomp, name);
200 labs = dname_count_size_labels(decomp, &len);
201 log_assert(name_len == len);
202 return name_tree_lookup(&priv->n, decomp, len, labs, dclass) != NULL;
203}
204
205size_t priv_get_mem(struct iter_priv* priv)
206{
207 if(!priv) return 0;
208 return sizeof(*priv) + regional_get_mem(priv->region);
209}
210
211int priv_rrset_bad(struct iter_priv* priv, ldns_buffer* pkt,
212 struct rrset_parse* rrset)
213{
214 if(priv->a.count == 0)
215 return 0; /* there are no blocked addresses */
216
217 /* see if it is a private name, that is allowed to have any */
218 if(priv_lookup_name(priv, pkt, rrset->dname, rrset->dname_len,
219 ntohs(rrset->rrset_class))) {
220 return 0;
221 } else {
222 /* so its a public name, check the address */
223 socklen_t len;
224 struct rr_parse* rr;
225 if(rrset->type == LDNS_RR_TYPE_A) {
226 struct sockaddr_storage addr;
227 struct sockaddr_in sa;
228
229 len = (socklen_t)sizeof(sa);
230 memset(&sa, 0, len);
231 sa.sin_family = AF_INET;
232 sa.sin_port = (in_port_t)htons(UNBOUND_DNS_PORT);
233 for(rr = rrset->rr_first; rr; rr = rr->next) {
234 if(ldns_read_uint16(rr->ttl_data+4)
235 != INET_SIZE)
236 continue;
237 memmove(&sa.sin_addr, rr->ttl_data+4+2,
238 INET_SIZE);
239 memmove(&addr, &sa, len);
240 if(priv_lookup_addr(priv, &addr, len))
241 return 1;
242 }
243 } else if(rrset->type == LDNS_RR_TYPE_AAAA) {
244 struct sockaddr_storage addr;
245 struct sockaddr_in6 sa;
246 len = (socklen_t)sizeof(sa);
247 memset(&sa, 0, len);
248 sa.sin6_family = AF_INET6;
249 sa.sin6_port = (in_port_t)htons(UNBOUND_DNS_PORT);
250 for(rr = rrset->rr_first; rr; rr = rr->next) {
251 if(ldns_read_uint16(rr->ttl_data+4)
252 != INET6_SIZE)
253 continue;
254 memmove(&sa.sin6_addr, rr->ttl_data+4+2,
255 INET6_SIZE);
256 memmove(&addr, &sa, len);
257 if(priv_lookup_addr(priv, &addr, len))
258 return 1;
259 }
260 }
261 }
262 return 0;
263}