1 #if !defined(lint) && !defined(SABER)
2 static const char rcsid[] = "$Id: res_update.c,v 1.6.2.4.4.2 2004/03/16 12:34:20 marka Exp $";
6 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
7 * Copyright (c) 1996-1999 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.
23 * Based on the Dynamic DNS reference implementation by Viraj Bais
24 * <viraj_bais@ccm.fm.intel.com>
27 #include "port_before.h"
29 #include <sys/param.h>
30 #include <sys/socket.h>
33 #include <netinet/in.h>
34 #include <arpa/inet.h>
35 #include <arpa/nameser.h>
40 #include <res_update.h>
49 #include "port_after.h"
50 #include "res_private.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 union res_sockaddr_union z_nsaddrs[MAXNS];
72 LIST(ns_updrec) z_rrlist;
73 LINK(struct zonegrp) z_link;
76 #define ZG_F_ZONESECTADDED 0x0001
80 static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2);
84 #define DPRINTF(x) do {\
85 int save_errno = errno; \
86 if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \
93 res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) {
95 u_char answer[PACKETSZ];
97 struct zonegrp *zptr, tgrp;
98 LIST(struct zonegrp) zgrps;
99 int nzones = 0, nscount = 0, n;
100 union res_sockaddr_union nsaddrs[MAXNS];
102 packet = malloc(NS_MAXMSG);
103 if (packet == NULL) {
104 DPRINTF(("malloc failed"));
107 /* Thread all of the updates onto a list of groups. */
109 memset(&tgrp, 0, sizeof (tgrp));
110 for (rrecp = rrecp_in; rrecp;
111 rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) {
113 /* Find the origin for it if there is one. */
114 tgrp.z_class = rrecp->r_class;
115 nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class,
116 RES_EXHAUSTIVE, tgrp.z_origin,
117 sizeof tgrp.z_origin,
118 tgrp.z_nsaddrs, MAXNS);
120 DPRINTF(("res_findzonecut failed (%d)", nscnt));
123 tgrp.z_nscount = nscnt;
124 /* Find the group for it if there is one. */
125 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link))
126 if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 &&
127 tgrp.z_class == zptr->z_class)
129 /* Make a group for it if there isn't one. */
131 zptr = malloc(sizeof *zptr);
133 DPRINTF(("malloc failed"));
138 INIT_LINK(zptr, z_link);
139 INIT_LIST(zptr->z_rrlist);
140 APPEND(zgrps, zptr, z_link);
142 /* Thread this rrecp onto the right group. */
143 APPEND(zptr->z_rrlist, rrecp, r_glink);
146 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) {
147 /* Construct zone section and prepend it. */
148 rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
149 zptr->z_class, ns_t_soa, 0);
151 DPRINTF(("res_mkupdrec failed"));
154 PREPEND(zptr->z_rrlist, rrecp, r_glink);
155 zptr->z_flags |= ZG_F_ZONESECTADDED;
157 /* Marshall the update message. */
158 n = res_nmkupdate(statp, HEAD(zptr->z_rrlist),
160 DPRINTF(("res_mkupdate -> %d", n));
164 /* Temporarily replace the resolver's nameserver set. */
165 nscount = res_getservers(statp, nsaddrs, MAXNS);
166 res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount);
168 /* Send the update and remember the result. */
172 DPRINTF(("TSIG is not supported\n"));
173 RES_SET_H_ERRNO(statp, NO_RECOVERY);
177 n = res_nsendsigned(statp, packet, n, key,
178 answer, sizeof answer);
181 n = res_nsend(statp, packet, n, answer, sizeof answer);
183 DPRINTF(("res_nsend: send error, n=%d (%s)\n",
184 n, strerror(errno)));
187 if (((HEADER *)answer)->rcode == NOERROR)
190 /* Restore resolver's nameserver set. */
191 res_setservers(statp, nsaddrs, nscount);
195 while (!EMPTY(zgrps)) {
197 if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
198 res_freeupdrec(HEAD(zptr->z_rrlist));
199 UNLINK(zgrps, zptr, z_link);
203 res_setservers(statp, nsaddrs, nscount);
212 res_dprintf(const char *fmt, ...) {
216 fputs(";; res_nupdate: ", stderr);
217 vfprintf(stderr, fmt, ap);