225 lines
6.0 KiB
C
225 lines
6.0 KiB
C
#if !defined(lint) && !defined(SABER)
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static const char rcsid[] = "$Id: res_update.c,v 1.13 2005/04/27 04:56:43 sra Exp $";
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#endif /* not lint */
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/*-
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1996-1999 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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/*! \file
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* \brief
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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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "port_before.h"
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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 <arpa/nameser.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 <res_update.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/list.h>
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#include <resolv.h>
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#include "port_after.h"
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#include "res_private.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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union res_sockaddr_union z_nsaddrs[MAXNS];
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int z_nscount;
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int z_flags;
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LIST(ns_updrec) z_rrlist;
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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 void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2);
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/* Macros. */
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#define DPRINTF(x) do {\
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int save_errno = errno; \
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if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \
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errno = save_errno; \
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} while (0)
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/* Public. */
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int
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res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) {
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ns_updrec *rrecp;
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u_char answer[PACKETSZ];
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u_char *packet;
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struct zonegrp *zptr, tgrp;
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LIST(struct zonegrp) zgrps;
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int nzones = 0, nscount = 0, n;
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union res_sockaddr_union nsaddrs[MAXNS];
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packet = malloc(NS_MAXMSG);
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if (packet == NULL) {
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DPRINTF(("malloc failed"));
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return (0);
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}
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/* Thread all of the updates onto a list of groups. */
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INIT_LIST(zgrps);
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memset(&tgrp, 0, sizeof (tgrp));
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for (rrecp = rrecp_in; rrecp;
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rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) {
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int nscnt;
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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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nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class,
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RES_EXHAUSTIVE, tgrp.z_origin,
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sizeof tgrp.z_origin,
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tgrp.z_nsaddrs, MAXNS);
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if (nscnt <= 0) {
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DPRINTF(("res_findzonecut failed (%d)", nscnt));
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goto done;
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}
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tgrp.z_nscount = nscnt;
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/* Find the group for it if there is one. */
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for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link))
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if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 &&
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tgrp.z_class == zptr->z_class)
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break;
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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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DPRINTF(("malloc failed"));
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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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INIT_LINK(zptr, z_link);
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INIT_LIST(zptr->z_rrlist);
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APPEND(zgrps, zptr, z_link);
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}
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/* Thread this rrecp onto the right group. */
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APPEND(zptr->z_rrlist, rrecp, r_glink);
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}
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for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) {
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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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DPRINTF(("res_mkupdrec failed"));
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goto done;
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}
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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 = res_nmkupdate(statp, HEAD(zptr->z_rrlist),
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packet, NS_MAXMSG);
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DPRINTF(("res_mkupdate -> %d", n));
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if (n < 0)
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goto done;
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/* Temporarily replace the resolver's nameserver set. */
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nscount = res_getservers(statp, nsaddrs, MAXNS);
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res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount);
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/* Send the update and remember the result. */
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if (key != NULL) {
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#ifdef _LIBC
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DPRINTF(("TSIG is not supported\n"));
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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goto done;
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#else
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n = res_nsendsigned(statp, packet, n, key,
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answer, sizeof answer);
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#endif
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} else
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n = res_nsend(statp, packet, n, answer, sizeof answer);
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if (n < 0) {
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DPRINTF(("res_nsend: send error, n=%d (%s)\n",
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n, strerror(errno)));
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goto done;
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}
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if (((HEADER *)answer)->rcode == NOERROR)
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nzones++;
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/* Restore resolver's nameserver set. */
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res_setservers(statp, nsaddrs, nscount);
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nscount = 0;
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}
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done:
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while (!EMPTY(zgrps)) {
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zptr = HEAD(zgrps);
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if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
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res_freeupdrec(HEAD(zptr->z_rrlist));
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UNLINK(zgrps, zptr, z_link);
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free(zptr);
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}
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if (nscount != 0)
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res_setservers(statp, nsaddrs, nscount);
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free(packet);
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return (nzones);
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}
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/* Private. */
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static void
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res_dprintf(const char *fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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fputs(";; res_nupdate: ", stderr);
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vfprintf(stderr, fmt, ap);
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fputc('\n', stderr);
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va_end(ap);
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}
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