contrib/bind-9.5.2/lib/bind/resolv/res_update.c

   1 #if !defined(lint) && !defined(SABER)
   2 static const char rcsid[] = "$Id: res_update.c,v 1.13 2005/04/27 04:56:43 sra Exp $";
   3 #endif /* not lint */
   4
   5 /*
   6  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   7  * Copyright (c) 1996-1999 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
  22 /*! \file
  23  * \brief
  24  * Based on the Dynamic DNS reference implementation by Viraj Bais
  25  * &lt;viraj_bais@ccm.fm.intel.com>
  26  */
  27
  28 #include "port_before.h"
  29
  30 #include <sys/param.h>
  31 #include <sys/socket.h>
  32 #include <sys/time.h>
  33
  34 #include <netinet/in.h>
  35 #include <arpa/inet.h>
  36 #include <arpa/nameser.h>
  37
  38 #include <errno.h>
  39 #include <limits.h>
  40 #include <netdb.h>
  41 #include <res_update.h>
  42 #include <stdarg.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46
  47 #include "isc/list.h"
  48 #include <resolv.h>
  49
  50 #include "port_after.h"
  51 #include "res_private.h"
  52
  53 /*%
  54  * Separate a linked list of records into groups so that all records
  55  * in a group will belong to a single zone on the nameserver.
  56  * Create a dynamic update packet for each zone and send it to the
  57  * nameservers for that zone, and await answer.
  58  * Abort if error occurs in updating any zone.
  59  * Return the number of zones updated on success, < 0 on error.
  60  *
  61  * On error, caller must deal with the unsynchronized zones
  62  * eg. an A record might have been successfully added to the forward
  63  * zone but the corresponding PTR record would be missing if error
  64  * was encountered while updating the reverse zone.
  65  */
  66
  67 struct zonegrp {
  68         char                    z_origin[MAXDNAME];
  69         ns_class                z_class;
  70         union res_sockaddr_union z_nsaddrs[MAXNS];
  71         int                     z_nscount;
  72         int                     z_flags;
  73         LIST(ns_updrec)         z_rrlist;
  74         LINK(struct zonegrp)    z_link;
  75 };
  76
  77 #define ZG_F_ZONESECTADDED      0x0001
  78
  79 /* Forward. */
  80
  81 static void     res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2);
  82
  83 /* Macros. */
  84
  85 #define DPRINTF(x) do {\
  86                 int save_errno = errno; \
  87                 if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \
  88                 errno = save_errno; \
  89         } while (0)
  90
  91 /* Public. */
  92
  93 int
  94 res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) {
  95         ns_updrec *rrecp;
  96         u_char answer[PACKETSZ];
  97         u_char *packet;
  98         struct zonegrp *zptr, tgrp;
  99         LIST(struct zonegrp) zgrps;
 100         int nzones = 0, nscount = 0, n;
 101         union res_sockaddr_union nsaddrs[MAXNS];
 102
 103         packet = malloc(NS_MAXMSG);
 104         if (packet == NULL) {
 105                 DPRINTF(("malloc failed"));
 106                 return (0);
 107         }
 108         /* Thread all of the updates onto a list of groups. */
 109         INIT_LIST(zgrps);
 110         memset(&tgrp, 0, sizeof (tgrp));
 111         for (rrecp = rrecp_in; rrecp;
 112              rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) {
 113                 int nscnt;
 114                 /* Find the origin for it if there is one. */
 115                 tgrp.z_class = rrecp->r_class;
 116                 nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class,
 117                                          RES_EXHAUSTIVE, tgrp.z_origin,
 118                                          sizeof tgrp.z_origin,
 119                                          tgrp.z_nsaddrs, MAXNS);
 120                 if (nscnt <= 0) {
 121                         DPRINTF(("res_findzonecut failed (%d)", nscnt));
 122                         goto done;
 123                 }
 124                 tgrp.z_nscount = nscnt;
 125                 /* Find the group for it if there is one. */
 126                 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link))
 127                         if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 &&
 128                             tgrp.z_class == zptr->z_class)
 129                                 break;
 130                 /* Make a group for it if there isn't one. */
 131                 if (zptr == NULL) {
 132                         zptr = malloc(sizeof *zptr);
 133                         if (zptr == NULL) {
 134                                 DPRINTF(("malloc failed"));
 135                                 goto done;
 136                         }
 137                         *zptr = tgrp;
 138                         zptr->z_flags = 0;
 139                         INIT_LINK(zptr, z_link);
 140                         INIT_LIST(zptr->z_rrlist);
 141                         APPEND(zgrps, zptr, z_link);
 142                 }
 143                 /* Thread this rrecp onto the right group. */
 144                 APPEND(zptr->z_rrlist, rrecp, r_glink);
 145         }
 146
 147         for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) {
 148                 /* Construct zone section and prepend it. */
 149                 rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
 150                                      zptr->z_class, ns_t_soa, 0);
 151                 if (rrecp == NULL) {
 152                         DPRINTF(("res_mkupdrec failed"));
 153                         goto done;
 154                 }
 155                 PREPEND(zptr->z_rrlist, rrecp, r_glink);
 156                 zptr->z_flags |= ZG_F_ZONESECTADDED;
 157
 158                 /* Marshall the update message. */
 159                 n = res_nmkupdate(statp, HEAD(zptr->z_rrlist),
 160                                   packet, NS_MAXMSG);
 161                 DPRINTF(("res_mkupdate -> %d", n));
 162                 if (n < 0)
 163                         goto done;
 164
 165                 /* Temporarily replace the resolver's nameserver set. */
 166                 nscount = res_getservers(statp, nsaddrs, MAXNS);
 167                 res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount);
 168
 169                 /* Send the update and remember the result. */
 170                 if (key != NULL)
 171 #ifdef _LIBC
 172                 {
 173                         DPRINTF(("TSIG is not supported\n"));
 174                         RES_SET_H_ERRNO(statp, NO_RECOVERY);
 175                         goto done;
 176                 }
 177 #else
 178                         n = res_nsendsigned(statp, packet, n, key,
 179                                             answer, sizeof answer);
 180 #endif
 181                 else
 182                         n = res_nsend(statp, packet, n, answer, sizeof answer);
 183                 if (n < 0) {
 184                         DPRINTF(("res_nsend: send error, n=%d (%s)\n",
 185                                  n, strerror(errno)));
 186                         goto done;
 187                 }
 188                 if (((HEADER *)answer)->rcode == NOERROR)
 189                         nzones++;
 190
 191                 /* Restore resolver's nameserver set. */
 192                 res_setservers(statp, nsaddrs, nscount);
 193                 nscount = 0;
 194         }
 195  done:
 196         while (!EMPTY(zgrps)) {
 197                 zptr = HEAD(zgrps);
 198                 if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
 199                         res_freeupdrec(HEAD(zptr->z_rrlist));
 200                 UNLINK(zgrps, zptr, z_link);
 201                 free(zptr);
 202         }
 203         if (nscount != 0)
 204                 res_setservers(statp, nsaddrs, nscount);
 205
 206         free(packet);
 207         return (nzones);
 208 }
 209
 210 /* Private. */
 211
 212 static void
 213 res_dprintf(const char *fmt, ...) {
 214         va_list ap;
 215
 216         va_start(ap, fmt);
 217         fputs(";; res_nupdate: ", stderr);
 218         vfprintf(stderr, fmt, ap);
 219         fputc('\n', stderr);
 220         va_end(ap);
 221 }