1: #if !defined(lint) && !defined(SABER)
2: static const char rcsid[] = "$Id: res_update.c,v 1.1.1.1 2012/10/09 09:06:54 misho Exp $";
3: #endif /* not lint */
4:
5: /*
6: * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
7: * Copyright (c) 1996-2003 by Internet Software Consortium
8: *
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.
12: *
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.
20: *
21: * Internet Systems Consortium, Inc.
22: * 950 Charter Street
23: * Redwood City, CA 94063
24: * <info@isc.org>
25: * https://www.isc.org/
26: */
27:
28: /*
29: * Based on the Dynamic DNS reference implementation by Viraj Bais
30: * <viraj_bais@ccm.fm.intel.com>
31: */
32:
33: #include <sys/param.h>
34: #include <sys/socket.h>
35: #include <sys/time.h>
36:
37: #include <netinet/in.h>
38: #include <arpa/inet.h>
39:
40: #include <errno.h>
41: #include <limits.h>
42: #include <netdb.h>
43: #include <stdarg.h>
44: #include <stdio.h>
45: #include <stdlib.h>
46: #include <string.h>
47:
48: #include <isc-dhcp/list.h>
49: #include "minires/minires.h"
50: #include "arpa/nameser.h"
51:
52: /*
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.
59: *
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.
64: */
65:
66: struct zonegrp {
67: char z_origin[MAXDNAME];
68: ns_class z_class;
69: struct in_addr z_nsaddrs[MAXNS];
70: int z_nscount;
71: int z_flags;
72: ISC_LIST(ns_updrec) z_rrlist;
73: ISC_LINK(struct zonegrp) z_link;
74: };
75:
76: #define ZG_F_ZONESECTADDED 0x0001
77:
78: /* Forward. */
79:
80: static int nscopy(struct sockaddr_in *, const struct sockaddr_in *, int);
81: static int nsprom(struct sockaddr_in *, const struct in_addr *, int);
82:
83: void tkey_free (ns_tsig_key **);
84:
85: isc_result_t
86: res_nupdate(res_state statp, ns_updrec *rrecp_in) {
87: ns_updrec *rrecp;
88: double answer[PACKETSZ / sizeof (double)];
89: double packet[2*PACKETSZ / sizeof (double)];
90: struct zonegrp *zptr, tgrp;
91: int nscount = 0;
92: unsigned n;
93: unsigned rval;
94: struct sockaddr_in nsaddrs[MAXNS];
95: ns_tsig_key *key;
96: void *zcookie = 0;
97: void *zcookp = &zcookie;
98: isc_result_t rcode;
99:
100: again:
101: /* Make sure all the updates are in the same zone, and find out
102: what zone they are in. */
103: zptr = NULL;
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,
108: RES_EXHAUSTIVE,
109: tgrp.z_origin,
110: sizeof tgrp.z_origin,
111: tgrp.z_nsaddrs, MAXNS, &tgrp.z_nscount,
112: zcookp);
113: if (rcode != ISC_R_SUCCESS)
114: goto done;
115: if (tgrp.z_nscount <= 0) {
116: rcode = ISC_R_NOTZONE;
117: goto done;
118: }
119: /* Make a group for it if there isn't one. */
120: if (zptr == NULL) {
121: zptr = malloc(sizeof *zptr);
122: if (zptr == NULL) {
123: rcode = ISC_R_NOMEMORY;
124: goto done;
125: }
126: *zptr = tgrp;
127: zptr->z_flags = 0;
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;
133: goto done;
134: }
135: /* Thread this rrecp onto the zone group. */
136: ISC_LIST_APPEND(zptr->z_rrlist, rrecp, r_glink);
137: }
138:
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);
142: if (rrecp == NULL) {
143: rcode = ISC_R_UNEXPECTED;
144: goto done;
145: }
146: ISC_LIST_PREPEND(zptr->z_rrlist, rrecp, r_glink);
147: zptr->z_flags |= ZG_F_ZONESECTADDED;
148:
149: /* Marshall the update message. */
150: n = sizeof packet;
151: rcode = res_nmkupdate(statp,
152: ISC_LIST_HEAD(zptr->z_rrlist), packet, &n);
153: if (rcode != ISC_R_SUCCESS)
154: goto done;
155:
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);
160:
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);
167: tkey_free (&key);
168: } else if (rcode == ISC_R_NOTFOUND || rcode == ISC_R_KEY_UNKNOWN) {
169: rcode = res_nsend(statp, packet, n,
170: answer, sizeof answer, &rval);
171: }
172: if (rcode != ISC_R_SUCCESS)
173: goto undone;
174:
175: rcode = ns_rcode_to_isc (((HEADER *)answer)->rcode);
176: if (zcookie && rcode == ISC_R_BADSIG) {
177: repudiate_zone (&zcookie);
178: }
179:
180: undone:
181: /* Restore resolver's nameserver set. */
182: statp->nscount = nscopy(statp->nsaddr_list, nsaddrs, nscount);
183: nscount = 0;
184: done:
185: if (zptr) {
186: if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
187: res_freeupdrec(ISC_LIST_HEAD(zptr->z_rrlist));
188: free(zptr);
189: }
190:
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)) {
194: zcookp = 0;
195: goto again;
196: }
197:
198: if (zcookie)
199: forget_zone (&zcookie);
200: return rcode;
201: }
202:
203: /* Private. */
204:
205: static int
206: nscopy(struct sockaddr_in *dst, const struct sockaddr_in *src, int n) {
207: int i;
208:
209: for (i = 0; i < n; i++)
210: dst[i] = src[i];
211: return (n);
212: }
213:
214: static int
215: nsprom(struct sockaddr_in *dst, const struct in_addr *src, int n) {
216: int i;
217:
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];
223: }
224: return (n);
225: }
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