external/bsd/libbind/dist/resolv/res_update.c

   1 /*      $NetBSD$        */
   2
   3 #if !defined(lint) && !defined(SABER)
   4 static const char rcsid[] = "Id: res_update.c,v 1.13 2005/04/27 04:56:43 sra Exp";
   5 #endif /* not lint */
   6
   7 /*
   8  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   9  * Copyright (c) 1996-1999 by Internet Software Consortium.
  10  *
  11  * Permission to use, copy, modify, and distribute this software for any
  12  * purpose with or without fee is hereby granted, provided that the above
  13  * copyright notice and this permission notice appear in all copies.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  16  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  17  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  18  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  19  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  20  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  21  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  */
  23
  24 /*! \file
  25  * \brief
  26  * Based on the Dynamic DNS reference implementation by Viraj Bais
  27  * &lt;viraj_bais@ccm.fm.intel.com>
  28  */
  29
  30 #include "port_before.h"
  31
  32 #include <sys/param.h>
  33 #include <sys/socket.h>
  34 #include <sys/time.h>
  35
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38 #include <arpa/nameser.h>
  39
  40 #include <errno.h>
  41 #include <limits.h>
  42 #include <netdb.h>
  43 #include <res_update.h>
  44 #include <stdarg.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 #include <isc/list.h>
  50 #include <resolv.h>
  51
  52 #include "port_after.h"
  53 #include "res_private.h"
  54
  55 /*%
  56  * Separate a linked list of records into groups so that all records
  57  * in a group will belong to a single zone on the nameserver.
  58  * Create a dynamic update packet for each zone and send it to the
  59  * nameservers for that zone, and await answer.
  60  * Abort if error occurs in updating any zone.
  61  * Return the number of zones updated on success, < 0 on error.
  62  *
  63  * On error, caller must deal with the unsynchronized zones
  64  * eg. an A record might have been successfully added to the forward
  65  * zone but the corresponding PTR record would be missing if error
  66  * was encountered while updating the reverse zone.
  67  */
  68
  69 struct zonegrp {
  70         char                    z_origin[MAXDNAME];
  71         ns_class                z_class;
  72         union res_sockaddr_union z_nsaddrs[MAXNS];
  73         int                     z_nscount;
  74         int                     z_flags;
  75         LIST(ns_updrec)         z_rrlist;
  76         LINK(struct zonegrp)    z_link;
  77 };
  78
  79 #define ZG_F_ZONESECTADDED      0x0001
  80
  81 /* Forward. */
  82
  83 static void     res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2);
  84
  85 /* Macros. */
  86
  87 #define DPRINTF(x) do {\
  88                 int save_errno = errno; \
  89                 if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \
  90                 errno = save_errno; \
  91         } while (0)
  92
  93 /* Public. */
  94
  95 int
  96 res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) {
  97         ns_updrec *rrecp;
  98         u_char answer[PACKETSZ];
  99         u_char *packet;
 100         struct zonegrp *zptr, tgrp;
 101         LIST(struct zonegrp) zgrps;
 102         int nzones = 0, nscount = 0, n;
 103         union res_sockaddr_union nsaddrs[MAXNS];
 104
 105         packet = malloc(NS_MAXMSG);
 106         if (packet == NULL) {
 107                 DPRINTF(("malloc failed"));
 108                 return (0);
 109         }
 110         /* Thread all of the updates onto a list of groups. */
 111         INIT_LIST(zgrps);
 112         memset(&tgrp, 0, sizeof (tgrp));
 113         for (rrecp = rrecp_in; rrecp;
 114              rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) {
 115                 int nscnt;
 116                 /* Find the origin for it if there is one. */
 117                 tgrp.z_class = rrecp->r_class;
 118                 nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class,
 119                                          RES_EXHAUSTIVE, tgrp.z_origin,
 120                                          sizeof tgrp.z_origin,
 121                                          tgrp.z_nsaddrs, MAXNS);
 122                 if (nscnt <= 0) {
 123                         DPRINTF(("res_findzonecut failed (%d)", nscnt));
 124                         goto done;
 125                 }
 126                 tgrp.z_nscount = nscnt;
 127                 /* Find the group for it if there is one. */
 128                 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link))
 129                         if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 &&
 130                             tgrp.z_class == zptr->z_class)
 131                                 break;
 132                 /* Make a group for it if there isn't one. */
 133                 if (zptr == NULL) {
 134                         zptr = malloc(sizeof *zptr);
 135                         if (zptr == NULL) {
 136                                 DPRINTF(("malloc failed"));
 137                                 goto done;
 138                         }
 139                         *zptr = tgrp;
 140                         zptr->z_flags = 0;
 141                         INIT_LINK(zptr, z_link);
 142                         INIT_LIST(zptr->z_rrlist);
 143                         APPEND(zgrps, zptr, z_link);
 144                 }
 145                 /* Thread this rrecp onto the right group. */
 146                 APPEND(zptr->z_rrlist, rrecp, r_glink);
 147         }
 148
 149         for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) {
 150                 /* Construct zone section and prepend it. */
 151                 rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
 152                                      zptr->z_class, ns_t_soa, 0);
 153                 if (rrecp == NULL) {
 154                         DPRINTF(("res_mkupdrec failed"));
 155                         goto done;
 156                 }
 157                 PREPEND(zptr->z_rrlist, rrecp, r_glink);
 158                 zptr->z_flags |= ZG_F_ZONESECTADDED;
 159
 160                 /* Marshall the update message. */
 161                 n = res_nmkupdate(statp, HEAD(zptr->z_rrlist),
 162                                   packet, NS_MAXMSG);
 163                 DPRINTF(("res_mkupdate -> %d", n));
 164                 if (n < 0)
 165                         goto done;
 166
 167                 /* Temporarily replace the resolver's nameserver set. */
 168                 nscount = res_getservers(statp, nsaddrs, MAXNS);
 169                 res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount);
 170
 171                 /* Send the update and remember the result. */
 172                 if (key != NULL)
 173                         n = res_nsendsigned(statp, packet, n, key,
 174                                             answer, sizeof answer);
 175                 else
 176                         n = res_nsend(statp, packet, n, answer, sizeof answer);
 177                 if (n < 0) {
 178                         DPRINTF(("res_nsend: send error, n=%d (%s)\n",
 179                                  n, strerror(errno)));
 180                         goto done;
 181                 }
 182                 if (((HEADER *)answer)->rcode == NOERROR)
 183                         nzones++;
 184
 185                 /* Restore resolver's nameserver set. */
 186                 res_setservers(statp, nsaddrs, nscount);
 187                 nscount = 0;
 188         }
 189  done:
 190         while (!EMPTY(zgrps)) {
 191                 zptr = HEAD(zgrps);
 192                 if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
 193                         res_freeupdrec(HEAD(zptr->z_rrlist));
 194                 UNLINK(zgrps, zptr, z_link);
 195                 free(zptr);
 196         }
 197         if (nscount != 0)
 198                 res_setservers(statp, nsaddrs, nscount);
 199
 200         free(packet);
 201         return (nzones);
 202 }
 203
 204 /* Private. */
 205
 206 static void
 207 res_dprintf(const char *fmt, ...) {
 208         va_list ap;
 209
 210         va_start(ap, fmt);
 211         fputs(";; res_nupdate: ", stderr);
 212         vfprintf(stderr, fmt, ap);
 213         fputc('\n', stderr);
 214         va_end(ap);
 215 }