res_update.c revision 1.1.10.2
1 1.1.10.2 msaitoh /* $NetBSD: res_update.c,v 1.1.10.2 2013/06/13 04:20:30 msaitoh Exp $ */ 2 1.1.10.2 msaitoh 3 1.1.10.2 msaitoh /* 4 1.1.10.2 msaitoh * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 5 1.1.10.2 msaitoh * Copyright (c) 1996-1999 by Internet Software Consortium. 6 1.1.10.2 msaitoh * 7 1.1.10.2 msaitoh * Permission to use, copy, modify, and distribute this software for any 8 1.1.10.2 msaitoh * purpose with or without fee is hereby granted, provided that the above 9 1.1.10.2 msaitoh * copyright notice and this permission notice appear in all copies. 10 1.1.10.2 msaitoh * 11 1.1.10.2 msaitoh * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 12 1.1.10.2 msaitoh * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 1.1.10.2 msaitoh * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 14 1.1.10.2 msaitoh * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 1.1.10.2 msaitoh * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 1.1.10.2 msaitoh * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 17 1.1.10.2 msaitoh * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 1.1.10.2 msaitoh */ 19 1.1.10.2 msaitoh 20 1.1.10.2 msaitoh /*! \file 21 1.1.10.2 msaitoh * \brief 22 1.1.10.2 msaitoh * Based on the Dynamic DNS reference implementation by Viraj Bais 23 1.1.10.2 msaitoh * <viraj_bais (at) ccm.fm.intel.com> 24 1.1.10.2 msaitoh */ 25 1.1.10.2 msaitoh #include <sys/cdefs.h> 26 1.1.10.2 msaitoh #if 0 27 1.1.10.2 msaitoh static const char rcsid[] = "Id: res_update.c,v 1.13 2005/04/27 04:56:43 sra Exp "; 28 1.1.10.2 msaitoh #else 29 1.1.10.2 msaitoh __RCSID("$NetBSD: res_update.c,v 1.1.10.2 2013/06/13 04:20:30 msaitoh Exp $"); 30 1.1.10.2 msaitoh #endif 31 1.1.10.2 msaitoh 32 1.1.10.2 msaitoh 33 1.1.10.2 msaitoh #include "port_before.h" 34 1.1.10.2 msaitoh 35 1.1.10.2 msaitoh #include <sys/param.h> 36 1.1.10.2 msaitoh #include <sys/socket.h> 37 1.1.10.2 msaitoh #include <sys/time.h> 38 1.1.10.2 msaitoh 39 1.1.10.2 msaitoh #include <netinet/in.h> 40 1.1.10.2 msaitoh #include <arpa/inet.h> 41 1.1.10.2 msaitoh #include <arpa/nameser.h> 42 1.1.10.2 msaitoh 43 1.1.10.2 msaitoh #include <errno.h> 44 1.1.10.2 msaitoh #include <limits.h> 45 1.1.10.2 msaitoh #include <netdb.h> 46 1.1.10.2 msaitoh #include <res_update.h> 47 1.1.10.2 msaitoh #include <stdarg.h> 48 1.1.10.2 msaitoh #include <stdio.h> 49 1.1.10.2 msaitoh #include <stdlib.h> 50 1.1.10.2 msaitoh #include <string.h> 51 1.1.10.2 msaitoh 52 1.1.10.2 msaitoh #include <isc/list.h> 53 1.1.10.2 msaitoh #include <resolv.h> 54 1.1.10.2 msaitoh 55 1.1.10.2 msaitoh #include "port_after.h" 56 1.1.10.2 msaitoh #include "res_private.h" 57 1.1.10.2 msaitoh 58 1.1.10.2 msaitoh /*% 59 1.1.10.2 msaitoh * Separate a linked list of records into groups so that all records 60 1.1.10.2 msaitoh * in a group will belong to a single zone on the nameserver. 61 1.1.10.2 msaitoh * Create a dynamic update packet for each zone and send it to the 62 1.1.10.2 msaitoh * nameservers for that zone, and await answer. 63 1.1.10.2 msaitoh * Abort if error occurs in updating any zone. 64 1.1.10.2 msaitoh * Return the number of zones updated on success, < 0 on error. 65 1.1.10.2 msaitoh * 66 1.1.10.2 msaitoh * On error, caller must deal with the unsynchronized zones 67 1.1.10.2 msaitoh * eg. an A record might have been successfully added to the forward 68 1.1.10.2 msaitoh * zone but the corresponding PTR record would be missing if error 69 1.1.10.2 msaitoh * was encountered while updating the reverse zone. 70 1.1.10.2 msaitoh */ 71 1.1.10.2 msaitoh 72 1.1.10.2 msaitoh struct zonegrp { 73 1.1.10.2 msaitoh char z_origin[MAXDNAME]; 74 1.1.10.2 msaitoh ns_class z_class; 75 1.1.10.2 msaitoh union res_sockaddr_union z_nsaddrs[MAXNS]; 76 1.1.10.2 msaitoh int z_nscount; 77 1.1.10.2 msaitoh int z_flags; 78 1.1.10.2 msaitoh TAILQ_HEAD(, ns_updrec) z_rrlist; 79 1.1.10.2 msaitoh TAILQ_ENTRY(zonegrp) z_link; 80 1.1.10.2 msaitoh }; 81 1.1.10.2 msaitoh 82 1.1.10.2 msaitoh #define ZG_F_ZONESECTADDED 0x0001 83 1.1.10.2 msaitoh 84 1.1.10.2 msaitoh /* Forward. */ 85 1.1.10.2 msaitoh 86 1.1.10.2 msaitoh static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2); 87 1.1.10.2 msaitoh 88 1.1.10.2 msaitoh /* Macros. */ 89 1.1.10.2 msaitoh 90 1.1.10.2 msaitoh #define DPRINTF(x) do {\ 91 1.1.10.2 msaitoh int save_errno = errno; \ 92 1.1.10.2 msaitoh if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \ 93 1.1.10.2 msaitoh errno = save_errno; \ 94 1.1.10.2 msaitoh } while (/*CONSTCOND*/0) 95 1.1.10.2 msaitoh 96 1.1.10.2 msaitoh /* Public. */ 97 1.1.10.2 msaitoh 98 1.1.10.2 msaitoh int 99 1.1.10.2 msaitoh res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) { 100 1.1.10.2 msaitoh ns_updrec *rrecp; 101 1.1.10.2 msaitoh u_char answer[PACKETSZ]; 102 1.1.10.2 msaitoh u_char *packet; 103 1.1.10.2 msaitoh struct zonegrp *zptr, tgrp; 104 1.1.10.2 msaitoh TAILQ_HEAD(, zonegrp) zgrps; 105 1.1.10.2 msaitoh int nzones = 0, nscount = 0, n; 106 1.1.10.2 msaitoh union res_sockaddr_union nsaddrs[MAXNS]; 107 1.1.10.2 msaitoh 108 1.1.10.2 msaitoh packet = malloc(NS_MAXMSG); 109 1.1.10.2 msaitoh if (packet == NULL) { 110 1.1.10.2 msaitoh DPRINTF(("malloc failed")); 111 1.1.10.2 msaitoh return (0); 112 1.1.10.2 msaitoh } 113 1.1.10.2 msaitoh /* Thread all of the updates onto a list of groups. */ 114 1.1.10.2 msaitoh TAILQ_INIT(&zgrps); 115 1.1.10.2 msaitoh memset(&tgrp, 0, sizeof (tgrp)); 116 1.1.10.2 msaitoh for (rrecp = rrecp_in; rrecp; rrecp = TAILQ_NEXT(rrecp, r_link)) { 117 1.1.10.2 msaitoh int nscnt; 118 1.1.10.2 msaitoh /* Find the origin for it if there is one. */ 119 1.1.10.2 msaitoh tgrp.z_class = rrecp->r_class; 120 1.1.10.2 msaitoh nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class, 121 1.1.10.2 msaitoh RES_EXHAUSTIVE, tgrp.z_origin, 122 1.1.10.2 msaitoh sizeof tgrp.z_origin, 123 1.1.10.2 msaitoh tgrp.z_nsaddrs, MAXNS); 124 1.1.10.2 msaitoh if (nscnt <= 0) { 125 1.1.10.2 msaitoh DPRINTF(("res_findzonecut failed (%d)", nscnt)); 126 1.1.10.2 msaitoh goto done; 127 1.1.10.2 msaitoh } 128 1.1.10.2 msaitoh tgrp.z_nscount = nscnt; 129 1.1.10.2 msaitoh /* Find the group for it if there is one. */ 130 1.1.10.2 msaitoh TAILQ_FOREACH(zptr, &zgrps, z_link) 131 1.1.10.2 msaitoh if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 && 132 1.1.10.2 msaitoh tgrp.z_class == zptr->z_class) 133 1.1.10.2 msaitoh break; 134 1.1.10.2 msaitoh /* Make a group for it if there isn't one. */ 135 1.1.10.2 msaitoh if (zptr == NULL) { 136 1.1.10.2 msaitoh zptr = malloc(sizeof *zptr); 137 1.1.10.2 msaitoh if (zptr == NULL) { 138 1.1.10.2 msaitoh DPRINTF(("malloc failed")); 139 1.1.10.2 msaitoh goto done; 140 1.1.10.2 msaitoh } 141 1.1.10.2 msaitoh *zptr = tgrp; 142 1.1.10.2 msaitoh zptr->z_flags = 0; 143 1.1.10.2 msaitoh TAILQ_INIT(&zptr->z_rrlist); 144 1.1.10.2 msaitoh TAILQ_INSERT_TAIL(&zgrps, zptr, z_link); 145 1.1.10.2 msaitoh } 146 1.1.10.2 msaitoh /* Thread this rrecp onto the right group. */ 147 1.1.10.2 msaitoh TAILQ_INSERT_TAIL(&zptr->z_rrlist, rrecp, r_glink); 148 1.1.10.2 msaitoh } 149 1.1.10.2 msaitoh 150 1.1.10.2 msaitoh TAILQ_FOREACH(zptr, &zgrps, z_link) { 151 1.1.10.2 msaitoh HEADER h; 152 1.1.10.2 msaitoh /* Construct zone section and prepend it. */ 153 1.1.10.2 msaitoh rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin, 154 1.1.10.2 msaitoh (u_int)zptr->z_class, ns_t_soa, 0); 155 1.1.10.2 msaitoh if (rrecp == NULL) { 156 1.1.10.2 msaitoh DPRINTF(("res_mkupdrec failed")); 157 1.1.10.2 msaitoh goto done; 158 1.1.10.2 msaitoh } 159 1.1.10.2 msaitoh TAILQ_INSERT_HEAD(&zptr->z_rrlist, rrecp, r_glink); 160 1.1.10.2 msaitoh zptr->z_flags |= ZG_F_ZONESECTADDED; 161 1.1.10.2 msaitoh 162 1.1.10.2 msaitoh /* Marshall the update message. */ 163 1.1.10.2 msaitoh n = res_nmkupdate(statp, TAILQ_FIRST(&zptr->z_rrlist), 164 1.1.10.2 msaitoh packet, NS_MAXMSG); 165 1.1.10.2 msaitoh DPRINTF(("res_mkupdate -> %d", n)); 166 1.1.10.2 msaitoh if (n < 0) 167 1.1.10.2 msaitoh goto done; 168 1.1.10.2 msaitoh 169 1.1.10.2 msaitoh /* Temporarily replace the resolver's nameserver set. */ 170 1.1.10.2 msaitoh nscount = res_getservers(statp, nsaddrs, MAXNS); 171 1.1.10.2 msaitoh res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount); 172 1.1.10.2 msaitoh 173 1.1.10.2 msaitoh /* Send the update and remember the result. */ 174 1.1.10.2 msaitoh if (key != NULL) 175 1.1.10.2 msaitoh n = res_nsendsigned(statp, packet, n, key, 176 1.1.10.2 msaitoh answer, (int)sizeof answer); 177 1.1.10.2 msaitoh else 178 1.1.10.2 msaitoh n = res_nsend(statp, packet, n, answer, 179 1.1.10.2 msaitoh (int)sizeof answer); 180 1.1.10.2 msaitoh if (n < 0) { 181 1.1.10.2 msaitoh DPRINTF(("res_nsend: send error, n=%d (%s)\n", 182 1.1.10.2 msaitoh n, strerror(errno))); 183 1.1.10.2 msaitoh goto done; 184 1.1.10.2 msaitoh } 185 1.1.10.2 msaitoh memcpy(&h, answer, sizeof(h)); 186 1.1.10.2 msaitoh if (h.rcode == NOERROR) 187 1.1.10.2 msaitoh nzones++; 188 1.1.10.2 msaitoh 189 1.1.10.2 msaitoh /* Restore resolver's nameserver set. */ 190 1.1.10.2 msaitoh res_setservers(statp, nsaddrs, nscount); 191 1.1.10.2 msaitoh nscount = 0; 192 1.1.10.2 msaitoh } 193 1.1.10.2 msaitoh done: 194 1.1.10.2 msaitoh while (!TAILQ_EMPTY(&zgrps)) { 195 1.1.10.2 msaitoh zptr = TAILQ_FIRST(&zgrps); 196 1.1.10.2 msaitoh if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0) 197 1.1.10.2 msaitoh res_freeupdrec(TAILQ_FIRST(&zptr->z_rrlist)); 198 1.1.10.2 msaitoh TAILQ_REMOVE(&zgrps, zptr, z_link); 199 1.1.10.2 msaitoh free(zptr); 200 1.1.10.2 msaitoh } 201 1.1.10.2 msaitoh if (nscount != 0) 202 1.1.10.2 msaitoh res_setservers(statp, nsaddrs, nscount); 203 1.1.10.2 msaitoh 204 1.1.10.2 msaitoh free(packet); 205 1.1.10.2 msaitoh return (nzones); 206 1.1.10.2 msaitoh } 207 1.1.10.2 msaitoh 208 1.1.10.2 msaitoh /* Private. */ 209 1.1.10.2 msaitoh 210 1.1.10.2 msaitoh static void 211 1.1.10.2 msaitoh res_dprintf(const char *fmt, ...) { 212 1.1.10.2 msaitoh va_list ap; 213 1.1.10.2 msaitoh 214 1.1.10.2 msaitoh va_start(ap, fmt); 215 1.1.10.2 msaitoh fputs(";; res_nupdate: ", stderr); 216 1.1.10.2 msaitoh vfprintf(stderr, fmt, ap); 217 1.1.10.2 msaitoh fputc('\n', stderr); 218 1.1.10.2 msaitoh va_end(ap); 219 1.1.10.2 msaitoh } 220
Indexes created Thu Oct 02 01:09:59 GMT 2025