226 lines
6.2 KiB
C
226 lines
6.2 KiB
C
#if !defined(lint) && !defined(SABER)
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static const char rcsid[] = "$Id: res_update.c,v 1.3 2005/08/11 17:13:26 drochner Exp $";
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#endif /* not lint */
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1996-2003 by Internet Software Consortium
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Internet Systems Consortium, Inc.
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* 950 Charter Street
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* Redwood City, CA 94063
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* <info@isc.org>
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* http://www.isc.org/
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*/
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/*
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* Based on the Dynamic DNS reference implementation by Viraj Bais
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* <viraj_bais@ccm.fm.intel.com>
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <limits.h>
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#include <netdb.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <isc-dhcp/list.h>
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#include "minires/minires.h"
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#include "arpa/nameser.h"
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/*
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* Separate a linked list of records into groups so that all records
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* in a group will belong to a single zone on the nameserver.
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* Create a dynamic update packet for each zone and send it to the
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* nameservers for that zone, and await answer.
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* Abort if error occurs in updating any zone.
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* Return the number of zones updated on success, < 0 on error.
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*
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* On error, caller must deal with the unsynchronized zones
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* eg. an A record might have been successfully added to the forward
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* zone but the corresponding PTR record would be missing if error
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* was encountered while updating the reverse zone.
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*/
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struct zonegrp {
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char z_origin[MAXDNAME];
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ns_class z_class;
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struct in_addr z_nsaddrs[MAXNS];
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int z_nscount;
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int z_flags;
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ISC_LIST(ns_updrec) z_rrlist;
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ISC_LINK(struct zonegrp) z_link;
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};
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#define ZG_F_ZONESECTADDED 0x0001
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/* Forward. */
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static int nscopy(struct sockaddr_in *, const struct sockaddr_in *, int);
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static int nsprom(struct sockaddr_in *, const struct in_addr *, int);
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void tkey_free (ns_tsig_key **);
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isc_result_t
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res_nupdate(res_state statp, ns_updrec *rrecp_in) {
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ns_updrec *rrecp;
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double answer[PACKETSZ / sizeof (double)];
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double packet[2*PACKETSZ / sizeof (double)];
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struct zonegrp *zptr, tgrp;
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int nscount = 0;
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unsigned n;
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unsigned rval;
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struct sockaddr_in nsaddrs[MAXNS];
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ns_tsig_key *key;
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void *zcookie = 0;
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void *zcookp = &zcookie;
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isc_result_t rcode;
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again:
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/* Make sure all the updates are in the same zone, and find out
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what zone they are in. */
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zptr = NULL;
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for (rrecp = rrecp_in; rrecp; rrecp = ISC_LIST_NEXT(rrecp, r_link)) {
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/* Find the origin for it if there is one. */
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tgrp.z_class = rrecp->r_class;
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rcode = res_findzonecut(statp, rrecp->r_dname, tgrp.z_class,
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RES_EXHAUSTIVE,
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tgrp.z_origin,
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sizeof tgrp.z_origin,
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tgrp.z_nsaddrs, MAXNS, &tgrp.z_nscount,
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zcookp);
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if (rcode != ISC_R_SUCCESS)
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goto done;
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if (tgrp.z_nscount <= 0) {
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rcode = ISC_R_NOTZONE;
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goto done;
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}
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/* Make a group for it if there isn't one. */
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if (zptr == NULL) {
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zptr = malloc(sizeof *zptr);
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if (zptr == NULL) {
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rcode = ISC_R_NOMEMORY;
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goto done;
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}
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*zptr = tgrp;
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zptr->z_flags = 0;
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ISC_LIST_INIT(zptr->z_rrlist);
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} else if (ns_samename(tgrp.z_origin, zptr->z_origin) == 0 ||
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tgrp.z_class != zptr->z_class) {
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/* Some of the records are in different zones. */
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rcode = ISC_R_CROSSZONE;
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goto done;
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}
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/* Thread this rrecp onto the zone group. */
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ISC_LIST_APPEND(zptr->z_rrlist, rrecp, r_glink);
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}
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/* Construct zone section and prepend it. */
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rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
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zptr->z_class, ns_t_soa, 0);
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if (rrecp == NULL) {
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rcode = ISC_R_UNEXPECTED;
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goto done;
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}
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ISC_LIST_PREPEND(zptr->z_rrlist, rrecp, r_glink);
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zptr->z_flags |= ZG_F_ZONESECTADDED;
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/* Marshall the update message. */
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n = sizeof packet;
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rcode = res_nmkupdate(statp,
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ISC_LIST_HEAD(zptr->z_rrlist), packet, &n);
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if (rcode != ISC_R_SUCCESS)
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goto done;
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/* Temporarily replace the resolver's nameserver set. */
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nscount = nscopy(nsaddrs, statp->nsaddr_list, statp->nscount);
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statp->nscount = nsprom(statp->nsaddr_list,
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zptr->z_nsaddrs, zptr->z_nscount);
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/* Send the update and remember the result. */
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key = (ns_tsig_key *)0;
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rcode = find_tsig_key (&key, zptr->z_origin, zcookie);
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if (rcode == ISC_R_SUCCESS) {
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rcode = res_nsendsigned(statp, packet, n, key,
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answer, sizeof answer, &rval);
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tkey_free (&key);
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} else if (rcode == ISC_R_NOTFOUND || rcode == ISC_R_KEY_UNKNOWN) {
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rcode = res_nsend(statp, packet, n,
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answer, sizeof answer, &rval);
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}
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if (rcode != ISC_R_SUCCESS)
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goto undone;
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rcode = ns_rcode_to_isc (((HEADER *)answer)->rcode);
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if (zcookie && rcode == ISC_R_BADSIG) {
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repudiate_zone (&zcookie);
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}
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undone:
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/* Restore resolver's nameserver set. */
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statp->nscount = nscopy(statp->nsaddr_list, nsaddrs, nscount);
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nscount = 0;
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done:
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if (zptr) {
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if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
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res_freeupdrec(ISC_LIST_HEAD(zptr->z_rrlist));
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free(zptr);
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}
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/* If the update failed because we used a cached zone and it
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didn't work, try it again without the cached zone. */
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if (zcookp && (rcode == ISC_R_NOTZONE || rcode == ISC_R_BADSIG)) {
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zcookp = 0;
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goto again;
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}
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if (zcookie)
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forget_zone (&zcookie);
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return rcode;
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}
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/* Private. */
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static int
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nscopy(struct sockaddr_in *dst, const struct sockaddr_in *src, int n) {
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int i;
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for (i = 0; i < n; i++)
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dst[i] = src[i];
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return (n);
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}
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static int
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nsprom(struct sockaddr_in *dst, const struct in_addr *src, int n) {
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int i;
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for (i = 0; i < n; i++) {
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memset(&dst[i], 0, sizeof dst[i]);
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dst[i].sin_family = AF_INET;
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dst[i].sin_port = htons(NS_DEFAULTPORT);
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dst[i].sin_addr = src[i];
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}
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return (n);
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}
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