1 #if !defined(lint) && !defined(SABER)
2 static const char rcsid[] = "$Id: res_update.c,v 1.11.2.3 2004/06/10 17:59:44 dhankins Exp $";
6 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
7 * Copyright (c) 1996-2003 by Internet Software Consortium
9 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
13 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
19 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 * Internet Systems Consortium, Inc.
23 * Redwood City, CA 94063
29 * Based on the Dynamic DNS reference implementation by Viraj Bais
30 * <viraj_bais@ccm.fm.intel.com>
33 #include <sys/param.h>
34 #include <sys/socket.h>
37 #include <netinet/in.h>
38 #include <arpa/inet.h>
48 #include <isc-dhcp/list.h>
49 #include "minires/minires.h"
50 #include "arpa/nameser.h"
53 * Separate a linked list of records into groups so that all records
54 * in a group will belong to a single zone on the nameserver.
55 * Create a dynamic update packet for each zone and send it to the
56 * nameservers for that zone, and await answer.
57 * Abort if error occurs in updating any zone.
58 * Return the number of zones updated on success, < 0 on error.
60 * On error, caller must deal with the unsynchronized zones
61 * eg. an A record might have been successfully added to the forward
62 * zone but the corresponding PTR record would be missing if error
63 * was encountered while updating the reverse zone.
67 char z_origin[MAXDNAME];
69 struct in_addr z_nsaddrs[MAXNS];
72 ISC_LIST(ns_updrec) z_rrlist;
73 ISC_LINK(struct zonegrp) z_link;
76 #define ZG_F_ZONESECTADDED 0x0001
80 static int nscopy(struct sockaddr_in *, const struct sockaddr_in *, int);
81 static int nsprom(struct sockaddr_in *, const struct in_addr *, int);
83 void tkey_free (ns_tsig_key **);
86 res_nupdate(res_state statp, ns_updrec *rrecp_in) {
88 double answer[PACKETSZ / sizeof (double)];
89 double packet[2*PACKETSZ / sizeof (double)];
90 struct zonegrp *zptr, tgrp;
91 int nzones = 0, nscount = 0;
94 struct sockaddr_in nsaddrs[MAXNS];
97 void *zcookp = &zcookie;
101 /* Make sure all the updates are in the same zone, and find out
102 what zone they are in. */
104 for (rrecp = rrecp_in; rrecp; rrecp = ISC_LIST_NEXT(rrecp, r_link)) {
105 /* Find the origin for it if there is one. */
106 tgrp.z_class = rrecp->r_class;
107 rcode = res_findzonecut(statp, rrecp->r_dname, tgrp.z_class,
110 sizeof tgrp.z_origin,
111 tgrp.z_nsaddrs, MAXNS, &tgrp.z_nscount,
113 if (rcode != ISC_R_SUCCESS)
115 if (tgrp.z_nscount <= 0) {
116 rcode = ISC_R_NOTZONE;
119 /* Make a group for it if there isn't one. */
121 zptr = malloc(sizeof *zptr);
123 rcode = ISC_R_NOMEMORY;
128 ISC_LIST_INIT(zptr->z_rrlist);
129 } else if (ns_samename(tgrp.z_origin, zptr->z_origin) == 0 ||
130 tgrp.z_class != zptr->z_class) {
131 /* Some of the records are in different zones. */
132 rcode = ISC_R_CROSSZONE;
135 /* Thread this rrecp onto the zone group. */
136 ISC_LIST_APPEND(zptr->z_rrlist, rrecp, r_glink);
139 /* Construct zone section and prepend it. */
140 rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
141 zptr->z_class, ns_t_soa, 0);
143 rcode = ISC_R_UNEXPECTED;
146 ISC_LIST_PREPEND(zptr->z_rrlist, rrecp, r_glink);
147 zptr->z_flags |= ZG_F_ZONESECTADDED;
149 /* Marshall the update message. */
151 rcode = res_nmkupdate(statp,
152 ISC_LIST_HEAD(zptr->z_rrlist), packet, &n);
153 if (rcode != ISC_R_SUCCESS)
156 /* Temporarily replace the resolver's nameserver set. */
157 nscount = nscopy(nsaddrs, statp->nsaddr_list, statp->nscount);
158 statp->nscount = nsprom(statp->nsaddr_list,
159 zptr->z_nsaddrs, zptr->z_nscount);
161 /* Send the update and remember the result. */
162 key = (ns_tsig_key *)0;
163 rcode = find_tsig_key (&key, zptr->z_origin, zcookie);
164 if (rcode == ISC_R_SUCCESS) {
165 rcode = res_nsendsigned(statp, packet, n, key,
166 answer, sizeof answer, &rval);
168 } else if (rcode == ISC_R_NOTFOUND || rcode == ISC_R_KEY_UNKNOWN) {
169 rcode = res_nsend(statp, packet, n,
170 answer, sizeof answer, &rval);
172 if (rcode != ISC_R_SUCCESS)
175 rcode = ns_rcode_to_isc (((HEADER *)answer)->rcode);
176 if (zcookie && rcode == ISC_R_BADSIG) {
177 repudiate_zone (&zcookie);
181 /* Restore resolver's nameserver set. */
182 statp->nscount = nscopy(statp->nsaddr_list, nsaddrs, nscount);
186 if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
187 res_freeupdrec(ISC_LIST_HEAD(zptr->z_rrlist));
191 /* If the update failed because we used a cached zone and it
192 didn't work, try it again without the cached zone. */
193 if (zcookp && (rcode == ISC_R_NOTZONE || rcode == ISC_R_BADSIG)) {
199 forget_zone (&zcookie);
206 nscopy(struct sockaddr_in *dst, const struct sockaddr_in *src, int n) {
209 for (i = 0; i < n; i++)
215 nsprom(struct sockaddr_in *dst, const struct in_addr *src, int n) {
218 for (i = 0; i < n; i++) {
219 memset(&dst[i], 0, sizeof dst[i]);
220 dst[i].sin_family = AF_INET;
221 dst[i].sin_port = htons(NS_DEFAULTPORT);
222 dst[i].sin_addr = src[i];