1 /* 2 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 #if !defined(lint) && !defined(SABER) 7 static const char rcsid[] = "$Id: res_update.c,v 1.38 2003/05/27 23:36:53 marka Exp $"; 8 #endif /* not lint */ 9 10 /* 11 * Copyright (c) 1996-1999 by Internet Software Consortium. 12 * 13 * Permission to use, copy, modify, and distribute this software for any 14 * purpose with or without fee is hereby granted, provided that the above 15 * copyright notice and this permission notice appear in all copies. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 18 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 20 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 21 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 22 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 23 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 24 * SOFTWARE. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * Based on the Dynamic DNS reference implementation by Viraj Bais 31 * <viraj_bais@ccm.fm.intel.com> 32 */ 33 34 #include "port_before.h" 35 36 #include <sys/param.h> 37 #include <sys/socket.h> 38 #include <sys/time.h> 39 40 #include <netinet/in.h> 41 #include <arpa/inet.h> 42 #include <arpa/nameser.h> 43 44 #include <errno.h> 45 #include <limits.h> 46 #include <netdb.h> 47 #include <res_update.h> 48 #include <stdarg.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 53 #include <isc/list.h> 54 #include <resolv.h> 55 56 #include "port_after.h" 57 #include "res_private.h" 58 59 /* 60 * Separate a linked list of records into groups so that all records 61 * in a group will belong to a single zone on the nameserver. 62 * Create a dynamic update packet for each zone and send it to the 63 * nameservers for that zone, and await answer. 64 * Abort if error occurs in updating any zone. 65 * Return the number of zones updated on success, < 0 on error. 66 * 67 * On error, caller must deal with the unsynchronized zones 68 * eg. an A record might have been successfully added to the forward 69 * zone but the corresponding PTR record would be missing if error 70 * was encountered while updating the reverse zone. 71 */ 72 73 struct zonegrp { 74 char z_origin[MAXDNAME]; 75 ns_class z_class; 76 union res_sockaddr_union z_nsaddrs[MAXNS]; 77 int z_nscount; 78 int z_flags; 79 LIST(ns_updrec) z_rrlist; 80 LINK(struct zonegrp) z_link; 81 }; 82 83 #define ZG_F_ZONESECTADDED 0x0001 84 85 /* Forward. */ 86 87 static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2); 88 89 /* Macros. */ 90 91 #define DPRINTF(x) do {\ 92 int save_errno = errno; \ 93 if ((statp->options & RES_DEBUG) != 0) res_dprintf x; \ 94 errno = save_errno; \ 95 } while (0) 96 97 /* Public. */ 98 99 int 100 res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) { 101 ns_updrec *rrecp; 102 u_char answer[PACKETSZ]; 103 u_char *packet; 104 struct zonegrp *zptr, tgrp; 105 LIST(struct zonegrp) zgrps; 106 int nzones = 0, nscount = 0, n; 107 union res_sockaddr_union nsaddrs[MAXNS]; 108 109 packet = malloc(NS_MAXMSG); 110 if (packet == NULL) { 111 DPRINTF(("malloc failed")); 112 return (0); 113 } 114 /* Thread all of the updates onto a list of groups. */ 115 INIT_LIST(zgrps); 116 memset(&tgrp, 0, sizeof (tgrp)); 117 for (rrecp = rrecp_in; rrecp; 118 rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) { 119 int nscnt; 120 /* Find the origin for it if there is one. */ 121 tgrp.z_class = rrecp->r_class; 122 nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class, 123 RES_EXHAUSTIVE, tgrp.z_origin, 124 sizeof tgrp.z_origin, 125 tgrp.z_nsaddrs, MAXNS); 126 if (nscnt <= 0) { 127 DPRINTF(("res_findzonecut failed (%d)", nscnt)); 128 goto done; 129 } 130 tgrp.z_nscount = nscnt; 131 /* Find the group for it if there is one. */ 132 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) 133 if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 && 134 tgrp.z_class == zptr->z_class) 135 break; 136 /* Make a group for it if there isn't one. */ 137 if (zptr == NULL) { 138 zptr = malloc(sizeof *zptr); 139 if (zptr == NULL) { 140 DPRINTF(("malloc failed")); 141 goto done; 142 } 143 *zptr = tgrp; 144 zptr->z_flags = 0; 145 INIT_LINK(zptr, z_link); 146 INIT_LIST(zptr->z_rrlist); 147 APPEND(zgrps, zptr, z_link); 148 } 149 /* Thread this rrecp onto the right group. */ 150 APPEND(zptr->z_rrlist, rrecp, r_glink); 151 } 152 153 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) { 154 /* Construct zone section and prepend it. */ 155 rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin, 156 zptr->z_class, ns_t_soa, 0); 157 if (rrecp == NULL) { 158 DPRINTF(("res_mkupdrec failed")); 159 goto done; 160 } 161 PREPEND(zptr->z_rrlist, rrecp, r_glink); 162 zptr->z_flags |= ZG_F_ZONESECTADDED; 163 164 /* Marshall the update message. */ 165 n = res_nmkupdate(statp, HEAD(zptr->z_rrlist), 166 packet, NS_MAXMSG); 167 DPRINTF(("res_mkupdate -> %d", n)); 168 if (n < 0) 169 goto done; 170 171 /* Temporarily replace the resolver's nameserver set. */ 172 nscount = res_getservers(statp, nsaddrs, MAXNS); 173 res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount); 174 175 /* Send the update and remember the result. */ 176 if (key != NULL) 177 n = res_nsendsigned(statp, packet, n, key, 178 answer, sizeof answer); 179 else 180 n = res_nsend(statp, packet, n, answer, sizeof answer); 181 if (n < 0) { 182 DPRINTF(("res_nsend: send error, n=%d (%s)\n", 183 n, strerror(errno))); 184 goto done; 185 } 186 if (((HEADER *)answer)->rcode == NOERROR) 187 nzones++; 188 189 /* Restore resolver's nameserver set. */ 190 res_setservers(statp, nsaddrs, nscount); 191 nscount = 0; 192 } 193 done: 194 while (!EMPTY(zgrps)) { 195 zptr = HEAD(zgrps); 196 if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0) 197 res_freeupdrec(HEAD(zptr->z_rrlist)); 198 UNLINK(zgrps, zptr, z_link); 199 free(zptr); 200 } 201 if (nscount != 0) 202 res_setservers(statp, nsaddrs, nscount); 203 204 free(packet); 205 return (nzones); 206 } 207 208 /* Private. */ 209 210 static void 211 res_dprintf(const char *fmt, ...) { 212 va_list ap; 213 214 va_start(ap, fmt); 215 fputs(";; res_nupdate: ", stderr); 216 vfprintf(stderr, fmt, ap); 217 fputc('\n', stderr); 218 va_end(ap); 219 } 220