3 * Functions for RFC 2136 Dynamic Update
5 * Copyright (c) 2005-2008, NLnet Labs. All rights reserved.
7 * See LICENSE for the license.
10 #include <ldns/config.h>
12 #include <ldns/ldns.h>
19 * RFC 2136 sections mapped to RFC 1035:
20 * zone/ZO -- QD/question
21 * prerequisites/PR -- AN/answers
22 * updates/UP -- NS/authority records
23 * additional data/AD -- AR/additional records
27 ldns_update_pkt_new(ldns_rdf *zone_rdf, ldns_rr_class c,
28 const ldns_rr_list *pr_rrlist, const ldns_rr_list *up_rrlist, const ldns_rr_list *ad_rrlist)
32 if (!zone_rdf || !up_rrlist) {
40 /* Create packet, fill in Zone Section. */
41 p = ldns_pkt_query_new(zone_rdf, LDNS_RR_TYPE_SOA, c, LDNS_RD);
45 zone_rdf = NULL; /* No longer safe to use. */
47 ldns_pkt_set_opcode(p, LDNS_PACKET_UPDATE);
49 ldns_rr_list_deep_free(p->_authority);
51 ldns_pkt_set_authority(p, ldns_rr_list_clone(up_rrlist));
53 ldns_update_set_upcount(p, ldns_rr_list_rr_count(up_rrlist));
56 ldns_rr_list_deep_free(p->_answer); /*XXX access function */
57 ldns_pkt_set_answer(p, ldns_rr_list_clone(pr_rrlist));
58 ldns_update_set_prcount(p, ldns_rr_list_rr_count(pr_rrlist));
62 ldns_rr_list_deep_free(p->_additional);
63 ldns_pkt_set_additional(p, ldns_rr_list_clone(ad_rrlist));
64 ldns_update_set_adcount(p, ldns_rr_list_rr_count(ad_rrlist));
70 ldns_update_pkt_tsig_add(ldns_pkt *p, const ldns_resolver *r)
73 uint16_t fudge = 300; /* Recommended fudge. [RFC2845 6.4] */
74 if (ldns_resolver_tsig_keyname(r) && ldns_resolver_tsig_keydata(r))
75 return ldns_pkt_tsig_sign(p, ldns_resolver_tsig_keyname(r),
76 ldns_resolver_tsig_keydata(r), fudge,
77 ldns_resolver_tsig_algorithm(r), NULL);
84 return LDNS_STATUS_OK;
87 /* Move to higher.c or similar? */
90 ldns_update_soa_mname(ldns_rdf *zone, ldns_resolver *r,
91 ldns_rr_class c, ldns_rdf **mname)
94 ldns_pkt *query, *resp;
96 /* Nondestructive, so clone 'zone' here */
97 query = ldns_pkt_query_new(ldns_rdf_clone(zone), LDNS_RR_TYPE_SOA,
100 return LDNS_STATUS_ERR;
103 ldns_pkt_set_random_id(query);
104 if (ldns_resolver_send_pkt(&resp, r, query) != LDNS_STATUS_OK) {
105 ldns_pkt_free(query);
106 return LDNS_STATUS_ERR;
108 ldns_pkt_free(query);
110 return LDNS_STATUS_ERR;
113 /* Expect a SOA answer. */
115 while ((soa_rr = ldns_rr_list_pop_rr(ldns_pkt_answer(resp)))) {
116 if (ldns_rr_get_type(soa_rr) != LDNS_RR_TYPE_SOA
117 || ldns_rr_rdf(soa_rr, 0) == NULL)
119 /* [RFC1035 3.3.13] */
120 *mname = ldns_rdf_clone(ldns_rr_rdf(soa_rr, 0));
125 return *mname ? LDNS_STATUS_OK : LDNS_STATUS_ERR;
128 /* Try to get zone and MNAME from SOA queries. */
130 ldns_update_soa_zone_mname(const char *fqdn, ldns_resolver *r,
131 ldns_rr_class c, ldns_rdf **zone_rdf, ldns_rdf **mname_rdf)
133 ldns_rr *soa_rr, *rr;
134 ldns_rdf *soa_zone = NULL, *soa_mname = NULL;
135 ldns_rdf *ipaddr, *fqdn_rdf, *tmp;
137 ldns_pkt *query, *resp;
138 ldns_resolver *tmp_r;
142 * XXX Ok, this cannot be the best way to find this...?
143 * XXX (I run into weird cache-related stuff here)
146 /* Step 1 - first find a nameserver that should know *something* */
147 fqdn_rdf = ldns_dname_new_frm_str(fqdn);
148 query = ldns_pkt_query_new(fqdn_rdf, LDNS_RR_TYPE_SOA, c, LDNS_RD);
150 return LDNS_STATUS_ERR;
154 ldns_pkt_set_random_id(query);
155 if (ldns_resolver_send_pkt(&resp, r, query) != LDNS_STATUS_OK) {
156 ldns_pkt_free(query);
157 return LDNS_STATUS_ERR;
159 ldns_pkt_free(query);
161 return LDNS_STATUS_ERR;
164 /* XXX Is it safe to only look in authority section here? */
165 while ((soa_rr = ldns_rr_list_pop_rr(ldns_pkt_authority(resp)))) {
166 if (ldns_rr_get_type(soa_rr) != LDNS_RR_TYPE_SOA
167 || ldns_rr_rdf(soa_rr, 0) == NULL)
169 /* [RFC1035 3.3.13] */
170 soa_mname = ldns_rdf_clone(ldns_rr_rdf(soa_rr, 0));
175 return LDNS_STATUS_ERR;
178 /* Step 2 - find SOA MNAME IP address, add to resolver */
179 query = ldns_pkt_query_new(soa_mname, LDNS_RR_TYPE_A, c, LDNS_RD);
181 return LDNS_STATUS_ERR;
185 ldns_pkt_set_random_id(query);
186 if (ldns_resolver_send_pkt(&resp, r, query) != LDNS_STATUS_OK) {
187 ldns_pkt_free(query);
188 return LDNS_STATUS_ERR;
190 ldns_pkt_free(query);
192 return LDNS_STATUS_ERR;
195 if (ldns_pkt_ancount(resp) == 0) {
197 return LDNS_STATUS_ERR;
200 /* XXX There may be more than one answer RR here. */
201 rr = ldns_rr_list_pop_rr(ldns_pkt_answer(resp));
202 ipaddr = ldns_rr_rdf(rr, 0);
204 /* Put the SOA mname IP first in the nameserver list. */
205 if (!(tmp_r = ldns_resolver_clone(r))) {
206 return LDNS_STATUS_MEM_ERR;
208 nslist = ldns_resolver_nameservers(tmp_r);
209 for (i = 0; i < ldns_resolver_nameserver_count(tmp_r); i++) {
210 if (ldns_rdf_compare(ipaddr, nslist[i]) == 0) {
213 nslist[0] = nslist[i];
219 if (i >= ldns_resolver_nameserver_count(tmp_r)) {
220 /* SOA mname was not part of the resolver so add it first. */
221 (void) ldns_resolver_push_nameserver(tmp_r, ipaddr);
222 nslist = ldns_resolver_nameservers(tmp_r);
223 i = ldns_resolver_nameserver_count(tmp_r) - 1;
225 nslist[0] = nslist[i];
230 /* Make sure to ask the first in the list, i.e SOA mname */
231 ldns_resolver_set_random(tmp_r, false);
233 /* Step 3 - Redo SOA query, sending to SOA MNAME directly. */
234 fqdn_rdf = ldns_dname_new_frm_str(fqdn);
235 query = ldns_pkt_query_new(fqdn_rdf, LDNS_RR_TYPE_SOA, c, LDNS_RD);
237 ldns_resolver_free(tmp_r);
238 return LDNS_STATUS_ERR;
242 ldns_pkt_set_random_id(query);
243 if (ldns_resolver_send_pkt(&resp, tmp_r, query) != LDNS_STATUS_OK) {
244 ldns_pkt_free(query);
245 ldns_resolver_free(tmp_r);
246 return LDNS_STATUS_ERR;
248 ldns_resolver_free(tmp_r);
249 ldns_pkt_free(query);
251 return LDNS_STATUS_ERR;
254 /* XXX Is it safe to only look in authority section here, too? */
255 while ((soa_rr = ldns_rr_list_pop_rr(ldns_pkt_authority(resp)))) {
256 if (ldns_rr_get_type(soa_rr) != LDNS_RR_TYPE_SOA
257 || ldns_rr_rdf(soa_rr, 0) == NULL)
259 /* [RFC1035 3.3.13] */
260 soa_mname = ldns_rdf_clone(ldns_rr_rdf(soa_rr, 0));
261 soa_zone = ldns_rdf_clone(ldns_rr_owner(soa_rr));
266 return LDNS_STATUS_ERR;
269 /* That seems to have worked, pass results to caller. */
270 *zone_rdf = soa_zone;
271 *mname_rdf = soa_mname;
272 return LDNS_STATUS_OK;
276 * ldns_update_{get,set}_{zo,pr,up,ad}count
280 ldns_update_zocount(const ldns_pkt *p)
282 return ldns_pkt_qdcount(p);
286 ldns_update_prcount(const ldns_pkt *p)
288 return ldns_pkt_ancount(p);
292 ldns_update_upcount(const ldns_pkt *p)
294 return ldns_pkt_nscount(p);
298 ldns_update_ad(const ldns_pkt *p)
300 return ldns_pkt_arcount(p);
304 ldns_update_set_zo(ldns_pkt *p, uint16_t v)
306 ldns_pkt_set_qdcount(p, v);
310 ldns_update_set_prcount(ldns_pkt *p, uint16_t v)
312 ldns_pkt_set_ancount(p, v);
316 ldns_update_set_upcount(ldns_pkt *p, uint16_t v)
318 ldns_pkt_set_nscount(p, v);
322 ldns_update_set_adcount(ldns_pkt *p, uint16_t v)
324 ldns_pkt_set_arcount(p, v);