1 #if !defined(lint) && !defined(SABER)
2 static const char rcsid[] = "$Id: res_update.c,v 1.11.2.2 2001/06/08 23:12:45 mellon Exp $";
6 * Copyright (c) 1996-1999 by Internet Software Consortium.
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
12 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
13 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
14 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
15 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
16 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
17 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
18 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
23 * Based on the Dynamic DNS reference implementation by Viraj Bais
24 * <viraj_bais@ccm.fm.intel.com>
27 #include <sys/param.h>
28 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <arpa/inet.h>
42 #include <isc-dhcp/list.h>
43 #include "minires/minires.h"
44 #include "arpa/nameser.h"
47 * Separate a linked list of records into groups so that all records
48 * in a group will belong to a single zone on the nameserver.
49 * Create a dynamic update packet for each zone and send it to the
50 * nameservers for that zone, and await answer.
51 * Abort if error occurs in updating any zone.
52 * Return the number of zones updated on success, < 0 on error.
54 * On error, caller must deal with the unsynchronized zones
55 * eg. an A record might have been successfully added to the forward
56 * zone but the corresponding PTR record would be missing if error
57 * was encountered while updating the reverse zone.
61 char z_origin[MAXDNAME];
63 struct in_addr z_nsaddrs[MAXNS];
66 ISC_LIST(ns_updrec) z_rrlist;
67 ISC_LINK(struct zonegrp) z_link;
70 #define ZG_F_ZONESECTADDED 0x0001
74 static int nscopy(struct sockaddr_in *, const struct sockaddr_in *, int);
75 static int nsprom(struct sockaddr_in *, const struct in_addr *, int);
77 void tkey_free (ns_tsig_key **);
80 res_nupdate(res_state statp, ns_updrec *rrecp_in) {
82 double answer[PACKETSZ / sizeof (double)];
83 double packet[2*PACKETSZ / sizeof (double)];
84 struct zonegrp *zptr, tgrp;
85 int nzones = 0, nscount = 0;
88 struct sockaddr_in nsaddrs[MAXNS];
91 void *zcookp = &zcookie;
95 /* Make sure all the updates are in the same zone, and find out
96 what zone they are in. */
98 for (rrecp = rrecp_in; rrecp; rrecp = ISC_LIST_NEXT(rrecp, r_link)) {
99 /* Find the origin for it if there is one. */
100 tgrp.z_class = rrecp->r_class;
101 rcode = res_findzonecut(statp, rrecp->r_dname, tgrp.z_class,
104 sizeof tgrp.z_origin,
105 tgrp.z_nsaddrs, MAXNS, &tgrp.z_nscount,
107 if (rcode != ISC_R_SUCCESS)
109 if (tgrp.z_nscount <= 0) {
110 rcode = ISC_R_NOTZONE;
113 /* Make a group for it if there isn't one. */
115 zptr = malloc(sizeof *zptr);
117 rcode = ISC_R_NOMEMORY;
122 ISC_LIST_INIT(zptr->z_rrlist);
123 } else if (ns_samename(tgrp.z_origin, zptr->z_origin) == 0 ||
124 tgrp.z_class != zptr->z_class) {
125 /* Some of the records are in different zones. */
126 rcode = ISC_R_CROSSZONE;
129 /* Thread this rrecp onto the zone group. */
130 ISC_LIST_APPEND(zptr->z_rrlist, rrecp, r_glink);
133 /* Construct zone section and prepend it. */
134 rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
135 zptr->z_class, ns_t_soa, 0);
137 rcode = ISC_R_UNEXPECTED;
140 ISC_LIST_PREPEND(zptr->z_rrlist, rrecp, r_glink);
141 zptr->z_flags |= ZG_F_ZONESECTADDED;
143 /* Marshall the update message. */
145 rcode = res_nmkupdate(statp,
146 ISC_LIST_HEAD(zptr->z_rrlist), packet, &n);
147 if (rcode != ISC_R_SUCCESS)
150 /* Temporarily replace the resolver's nameserver set. */
151 nscount = nscopy(nsaddrs, statp->nsaddr_list, statp->nscount);
152 statp->nscount = nsprom(statp->nsaddr_list,
153 zptr->z_nsaddrs, zptr->z_nscount);
155 /* Send the update and remember the result. */
156 key = (ns_tsig_key *)0;
157 rcode = find_tsig_key (&key, zptr->z_origin, zcookie);
158 if (rcode == ISC_R_SUCCESS) {
159 rcode = res_nsendsigned(statp, packet, n, key,
160 answer, sizeof answer, &rval);
162 } else if (rcode == ISC_R_NOTFOUND || rcode == ISC_R_KEY_UNKNOWN) {
163 rcode = res_nsend(statp, packet, n,
164 answer, sizeof answer, &rval);
166 if (rcode != ISC_R_SUCCESS)
169 rcode = ns_rcode_to_isc (((HEADER *)answer)->rcode);
170 if (zcookie && rcode == ISC_R_BADSIG) {
171 repudiate_zone (&zcookie);
175 /* Restore resolver's nameserver set. */
176 statp->nscount = nscopy(statp->nsaddr_list, nsaddrs, nscount);
180 if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
181 res_freeupdrec(ISC_LIST_HEAD(zptr->z_rrlist));
185 /* If the update failed because we used a cached zone and it
186 didn't work, try it again without the cached zone. */
187 if (zcookp && (rcode == ISC_R_NOTZONE || rcode == ISC_R_BADSIG)) {
193 forget_zone (&zcookie);
200 nscopy(struct sockaddr_in *dst, const struct sockaddr_in *src, int n) {
203 for (i = 0; i < n; i++)
209 nsprom(struct sockaddr_in *dst, const struct in_addr *src, int n) {
212 for (i = 0; i < n; i++) {
213 memset(&dst[i], 0, sizeof dst[i]);
214 dst[i].sin_family = AF_INET;
215 dst[i].sin_port = htons(NS_DEFAULTPORT);
216 dst[i].sin_addr = src[i];