1 #if !defined(lint) && !defined(SABER)
2 static const char rcsid[] = "$Id: res_update.c,v 1.13 2005/04/27 04:56:43 sra Exp $";
6 * SPDX-License-Identifier: ISC
8 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
9 * Copyright (c) 1996-1999 by Internet Software Consortium.
11 * Permission to use, copy, modify, and distribute this software for any
12 * purpose with or without fee is hereby granted, provided that the above
13 * copyright notice and this permission notice appear in all copies.
15 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
16 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
17 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
18 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
21 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
26 * Based on the Dynamic DNS reference implementation by Viraj Bais
27 * <viraj_bais@ccm.fm.intel.com>
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include "port_before.h"
35 #include <sys/param.h>
36 #include <sys/socket.h>
39 #include <netinet/in.h>
40 #include <arpa/inet.h>
41 #include <arpa/nameser.h>
46 #include <res_update.h>
55 #include "port_after.h"
56 #include "res_private.h"
59 * Separate a linked list of records into groups so that all records
60 * in a group will belong to a single zone on the nameserver.
61 * Create a dynamic update packet for each zone and send it to the
62 * nameservers for that zone, and await answer.
63 * Abort if error occurs in updating any zone.
64 * Return the number of zones updated on success, < 0 on error.
66 * On error, caller must deal with the unsynchronized zones
67 * eg. an A record might have been successfully added to the forward
68 * zone but the corresponding PTR record would be missing if error
69 * was encountered while updating the reverse zone.
73 char z_origin[MAXDNAME];
75 union res_sockaddr_union z_nsaddrs[MAXNS];
78 LIST(ns_updrec) z_rrlist;
79 LINK(struct zonegrp) z_link;
82 #define ZG_F_ZONESECTADDED 0x0001
86 static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2);
90 #define DPRINTF(x) do {\
91 int save_errno = errno; \
92 if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \
99 res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) {
101 u_char answer[PACKETSZ];
103 struct zonegrp *zptr, tgrp;
104 LIST(struct zonegrp) zgrps;
105 int nzones = 0, nscount = 0, n;
106 union res_sockaddr_union nsaddrs[MAXNS];
108 packet = malloc(NS_MAXMSG);
109 if (packet == NULL) {
110 DPRINTF(("malloc failed"));
113 /* Thread all of the updates onto a list of groups. */
115 memset(&tgrp, 0, sizeof (tgrp));
116 for (rrecp = rrecp_in; rrecp;
117 rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) {
119 /* Find the origin for it if there is one. */
120 tgrp.z_class = rrecp->r_class;
121 nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class,
122 RES_EXHAUSTIVE, tgrp.z_origin,
123 sizeof tgrp.z_origin,
124 tgrp.z_nsaddrs, MAXNS);
126 DPRINTF(("res_findzonecut failed (%d)", nscnt));
129 tgrp.z_nscount = nscnt;
130 /* Find the group for it if there is one. */
131 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link))
132 if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 &&
133 tgrp.z_class == zptr->z_class)
135 /* Make a group for it if there isn't one. */
137 zptr = malloc(sizeof *zptr);
139 DPRINTF(("malloc failed"));
144 INIT_LINK(zptr, z_link);
145 INIT_LIST(zptr->z_rrlist);
146 APPEND(zgrps, zptr, z_link);
148 /* Thread this rrecp onto the right group. */
149 APPEND(zptr->z_rrlist, rrecp, r_glink);
152 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) {
153 /* Construct zone section and prepend it. */
154 rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
155 zptr->z_class, ns_t_soa, 0);
157 DPRINTF(("res_mkupdrec failed"));
160 PREPEND(zptr->z_rrlist, rrecp, r_glink);
161 zptr->z_flags |= ZG_F_ZONESECTADDED;
163 /* Marshall the update message. */
164 n = res_nmkupdate(statp, HEAD(zptr->z_rrlist),
166 DPRINTF(("res_mkupdate -> %d", n));
170 /* Temporarily replace the resolver's nameserver set. */
171 nscount = res_getservers(statp, nsaddrs, MAXNS);
172 res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount);
174 /* Send the update and remember the result. */
177 DPRINTF(("TSIG is not supported\n"));
178 RES_SET_H_ERRNO(statp, NO_RECOVERY);
181 n = res_nsendsigned(statp, packet, n, key,
182 answer, sizeof answer);
185 n = res_nsend(statp, packet, n, answer, sizeof answer);
187 DPRINTF(("res_nsend: send error, n=%d (%s)\n",
188 n, strerror(errno)));
191 if (((HEADER *)answer)->rcode == NOERROR)
194 /* Restore resolver's nameserver set. */
195 res_setservers(statp, nsaddrs, nscount);
199 while (!EMPTY(zgrps)) {
201 if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
202 res_freeupdrec(HEAD(zptr->z_rrlist));
203 UNLINK(zgrps, zptr, z_link);
207 res_setservers(statp, nsaddrs, nscount);
216 res_dprintf(const char *fmt, ...) {
220 fputs(";; res_nupdate: ", stderr);
221 vfprintf(stderr, fmt, ap);