232 lines
6.3 KiB
C
232 lines
6.3 KiB
C
/* $NetBSD: res_update.c,v 1.3 2001/01/27 07:22:05 itojun Exp $ */
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#if !defined(lint) && !defined(SABER)
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static const char rcsid[] = "Id: res_update.c,v 1.25 2000/11/22 01:20:47 marka Exp";
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#endif /* not lint */
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/*
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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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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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 "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 <resolv.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 "port_after.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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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 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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static void dprintf(const char *, ...)
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__attribute__((__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) != 0) 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], packet[2*PACKETSZ];
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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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struct sockaddr_in nsaddrs[MAXNS];
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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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for (rrecp = rrecp_in; rrecp; rrecp = 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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tgrp.z_nscount =
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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);
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if (tgrp.z_nscount <= 0) {
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DPRINTF(("res_findzonecut failed (%d)",
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tgrp.z_nscount));
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goto done;
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}
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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, sizeof packet);
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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 = 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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if (key != NULL)
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n = res_nsendsigned(statp, packet, n, key,
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answer, sizeof answer);
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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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statp->nscount = nscopy(statp->nsaddr_list, 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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statp->nscount = nscopy(statp->nsaddr_list, nsaddrs, nscount);
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return (nzones);
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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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static void
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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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