1#ifndef __APPLE__ 2#if !defined(lint) && !defined(SABER) 3static const char rcsid[] = "$Id: res_update.c,v 1.1 2006/03/01 19:01:39 majka Exp $"; 4#endif /* not lint */ 5#endif 6 7/* 8 * Copyright (c) 1996-1999 by Internet Software Consortium. 9 * 10 * Permission to use, copy, modify, and distribute this software for any 11 * purpose with or without fee is hereby granted, provided that the above 12 * copyright notice and this permission notice appear in all copies. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 15 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 17 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 18 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 19 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 20 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 21 * SOFTWARE. 22 */ 23 24/* 25 * Based on the Dynamic DNS reference implementation by Viraj Bais 26 * <viraj_bais@ccm.fm.intel.com> 27 */ 28 29#ifndef __APPLE__ 30#include "port_before.h" 31#endif 32 33#include <sys/param.h> 34#include <sys/socket.h> 35#include <sys/time.h> 36 37#include <netinet/in.h> 38#include <arpa/inet.h> 39#include <arpa/nameser.h> 40 41#include <errno.h> 42#include <limits.h> 43#include <netdb.h> 44#include <res_update.h> 45#include <stdarg.h> 46#include <stdio.h> 47#include <stdlib.h> 48#include <string.h> 49 50#include <resolv.h> 51 52#ifndef __APPLE__ 53#include <isc/list.h> 54#include "port_after.h" 55#endif 56#include "res_private.h" 57 58/* 59 * Separate a linked list of records into groups so that all records 60 * in a group will belong to a single zone on the nameserver. 61 * Create a dynamic update packet for each zone and send it to the 62 * nameservers for that zone, and await answer. 63 * Abort if error occurs in updating any zone. 64 * Return the number of zones updated on success, < 0 on error. 65 * 66 * On error, caller must deal with the unsynchronized zones 67 * eg. an A record might have been successfully added to the forward 68 * zone but the corresponding PTR record would be missing if error 69 * was encountered while updating the reverse zone. 70 */ 71 72struct zonegrp { 73 char z_origin[NS_MAXDNAME]; 74 ns_class z_class; 75 union res_sockaddr_union z_nsaddrs[MAXNS]; 76 int z_nscount; 77 int z_flags; 78 LIST(ns_updrec) z_rrlist; 79 LINK(struct zonegrp) z_link; 80}; 81 82#define ZG_F_ZONESECTADDED 0x0001 83 84/* Forward. */ 85 86static void res_dprintf(const char *, ...); 87 88/* Macros. */ 89 90#define DPRINTF(x) do {\ 91 int save_errno = errno; \ 92 if ((statp->options & RES_DEBUG) != 0) res_dprintf x; \ 93 errno = save_errno; \ 94 } while (0) 95 96/* Public. */ 97 98int 99res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) { 100 ns_updrec *rrecp; 101 u_char answer[NS_PACKETSZ], packet[2*NS_PACKETSZ]; 102 struct zonegrp *zptr, tgrp; 103 LIST(struct zonegrp) zgrps; 104 int nzones = 0, nscount = 0, n; 105 union res_sockaddr_union nsaddrs[MAXNS]; 106 107 /* Thread all of the updates onto a list of groups. */ 108 INIT_LIST(zgrps); 109 memset(&tgrp, 0, sizeof (tgrp)); 110 for (rrecp = rrecp_in; rrecp; 111 rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) { 112 int nscnt; 113 /* Find the origin for it if there is one. */ 114 tgrp.z_class = rrecp->r_class; 115 nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class, 116 RES_EXHAUSTIVE, tgrp.z_origin, 117 sizeof tgrp.z_origin, 118 tgrp.z_nsaddrs, MAXNS); 119 if (nscnt <= 0) { 120 DPRINTF(("res_findzonecut failed (%d)", nscnt)); 121 goto done; 122 } 123 tgrp.z_nscount = nscnt; 124 /* Find the group for it if there is one. */ 125 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) 126 if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 && 127 tgrp.z_class == zptr->z_class) 128 break; 129 /* Make a group for it if there isn't one. */ 130 if (zptr == NULL) { 131 zptr = malloc(sizeof *zptr); 132 if (zptr == NULL) { 133 DPRINTF(("malloc failed")); 134 goto done; 135 } 136 *zptr = tgrp; 137 zptr->z_flags = 0; 138 INIT_LINK(zptr, z_link); 139 INIT_LIST(zptr->z_rrlist); 140 APPEND(zgrps, zptr, z_link); 141 } 142 /* Thread this rrecp onto the right group. */ 143 APPEND(zptr->z_rrlist, rrecp, r_glink); 144 } 145 146 for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) { 147 /* Construct zone section and prepend it. */ 148 rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin, 149 zptr->z_class, ns_t_soa, 0); 150 if (rrecp == NULL) { 151 DPRINTF(("res_mkupdrec failed")); 152 goto done; 153 } 154 PREPEND(zptr->z_rrlist, rrecp, r_glink); 155 zptr->z_flags |= ZG_F_ZONESECTADDED; 156 157 /* Marshall the update message. */ 158 n = res_nmkupdate(statp, HEAD(zptr->z_rrlist), 159 packet, sizeof packet); 160 DPRINTF(("res_mkupdate -> %d", n)); 161 if (n < 0) 162 goto done; 163 164 /* Temporarily replace the resolver's nameserver set. */ 165 nscount = res_getservers(statp, nsaddrs, MAXNS); 166 res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount); 167 168 /* Send the update and remember the result. */ 169 if (key != NULL) 170 n = res_nsendsigned(statp, packet, n, key, 171 answer, sizeof answer); 172 else 173 n = res_nsend(statp, packet, n, answer, sizeof answer); 174 if (n < 0) { 175 DPRINTF(("res_nsend: send error, n=%d (%s)\n", 176 n, strerror(errno))); 177 goto done; 178 } 179 if (((HEADER *)answer)->rcode == ns_r_noerror) 180 nzones++; 181 182 /* Restore resolver's nameserver set. */ 183 res_setservers(statp, nsaddrs, nscount); 184 nscount = 0; 185 } 186 done: 187 while (!EMPTY(zgrps)) { 188 zptr = HEAD(zgrps); 189 if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0) 190 res_freeupdrec(HEAD(zptr->z_rrlist)); 191 UNLINK(zgrps, zptr, z_link); 192 free(zptr); 193 } 194 if (nscount != 0) 195 res_setservers(statp, nsaddrs, nscount); 196 197 return (nzones); 198} 199 200/* Private. */ 201 202static void 203res_dprintf(const char *fmt, ...) { 204 va_list ap; 205 206 va_start(ap, fmt); 207 fputs(";; res_nupdate: ", stderr); 208 vfprintf(stderr, fmt, ap); 209 fputc('\n', stderr); 210 va_end(ap); 211} 212