1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 3*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 4*7c478bd9Sstevel@tonic-gate */ 5*7c478bd9Sstevel@tonic-gate 6*7c478bd9Sstevel@tonic-gate #if !defined(lint) && !defined(SABER) 7*7c478bd9Sstevel@tonic-gate static const char rcsid[] = "$Id: res_update.c,v 1.38 2003/05/27 23:36:53 marka Exp $"; 8*7c478bd9Sstevel@tonic-gate #endif /* not lint */ 9*7c478bd9Sstevel@tonic-gate 10*7c478bd9Sstevel@tonic-gate /* 11*7c478bd9Sstevel@tonic-gate * Copyright (c) 1996-1999 by Internet Software Consortium. 12*7c478bd9Sstevel@tonic-gate * 13*7c478bd9Sstevel@tonic-gate * Permission to use, copy, modify, and distribute this software for any 14*7c478bd9Sstevel@tonic-gate * purpose with or without fee is hereby granted, provided that the above 15*7c478bd9Sstevel@tonic-gate * copyright notice and this permission notice appear in all copies. 16*7c478bd9Sstevel@tonic-gate * 17*7c478bd9Sstevel@tonic-gate * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 18*7c478bd9Sstevel@tonic-gate * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 19*7c478bd9Sstevel@tonic-gate * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 20*7c478bd9Sstevel@tonic-gate * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 21*7c478bd9Sstevel@tonic-gate * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 22*7c478bd9Sstevel@tonic-gate * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 23*7c478bd9Sstevel@tonic-gate * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 24*7c478bd9Sstevel@tonic-gate * SOFTWARE. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*7c478bd9Sstevel@tonic-gate 29*7c478bd9Sstevel@tonic-gate /* 30*7c478bd9Sstevel@tonic-gate * Based on the Dynamic DNS reference implementation by Viraj Bais 31*7c478bd9Sstevel@tonic-gate * <viraj_bais@ccm.fm.intel.com> 32*7c478bd9Sstevel@tonic-gate */ 33*7c478bd9Sstevel@tonic-gate 34*7c478bd9Sstevel@tonic-gate #include "port_before.h" 35*7c478bd9Sstevel@tonic-gate 36*7c478bd9Sstevel@tonic-gate #include <sys/param.h> 37*7c478bd9Sstevel@tonic-gate #include <sys/socket.h> 38*7c478bd9Sstevel@tonic-gate #include <sys/time.h> 39*7c478bd9Sstevel@tonic-gate 40*7c478bd9Sstevel@tonic-gate #include <netinet/in.h> 41*7c478bd9Sstevel@tonic-gate #include <arpa/inet.h> 42*7c478bd9Sstevel@tonic-gate #include <arpa/nameser.h> 43*7c478bd9Sstevel@tonic-gate 44*7c478bd9Sstevel@tonic-gate #include <errno.h> 45*7c478bd9Sstevel@tonic-gate #include <limits.h> 46*7c478bd9Sstevel@tonic-gate #include <netdb.h> 47*7c478bd9Sstevel@tonic-gate #include <res_update.h> 48*7c478bd9Sstevel@tonic-gate #include <stdarg.h> 49*7c478bd9Sstevel@tonic-gate #include <stdio.h> 50*7c478bd9Sstevel@tonic-gate #include <stdlib.h> 51*7c478bd9Sstevel@tonic-gate #include <string.h> 52*7c478bd9Sstevel@tonic-gate 53*7c478bd9Sstevel@tonic-gate #include <isc/list.h> 54*7c478bd9Sstevel@tonic-gate #include <resolv.h> 55*7c478bd9Sstevel@tonic-gate 56*7c478bd9Sstevel@tonic-gate #include "port_after.h" 57*7c478bd9Sstevel@tonic-gate #include "res_private.h" 58*7c478bd9Sstevel@tonic-gate 59*7c478bd9Sstevel@tonic-gate /* 60*7c478bd9Sstevel@tonic-gate * Separate a linked list of records into groups so that all records 61*7c478bd9Sstevel@tonic-gate * in a group will belong to a single zone on the nameserver. 62*7c478bd9Sstevel@tonic-gate * Create a dynamic update packet for each zone and send it to the 63*7c478bd9Sstevel@tonic-gate * nameservers for that zone, and await answer. 64*7c478bd9Sstevel@tonic-gate * Abort if error occurs in updating any zone. 65*7c478bd9Sstevel@tonic-gate * Return the number of zones updated on success, < 0 on error. 66*7c478bd9Sstevel@tonic-gate * 67*7c478bd9Sstevel@tonic-gate * On error, caller must deal with the unsynchronized zones 68*7c478bd9Sstevel@tonic-gate * eg. an A record might have been successfully added to the forward 69*7c478bd9Sstevel@tonic-gate * zone but the corresponding PTR record would be missing if error 70*7c478bd9Sstevel@tonic-gate * was encountered while updating the reverse zone. 71*7c478bd9Sstevel@tonic-gate */ 72*7c478bd9Sstevel@tonic-gate 73*7c478bd9Sstevel@tonic-gate struct zonegrp { 74*7c478bd9Sstevel@tonic-gate char z_origin[MAXDNAME]; 75*7c478bd9Sstevel@tonic-gate ns_class z_class; 76*7c478bd9Sstevel@tonic-gate union res_sockaddr_union z_nsaddrs[MAXNS]; 77*7c478bd9Sstevel@tonic-gate int z_nscount; 78*7c478bd9Sstevel@tonic-gate int z_flags; 79*7c478bd9Sstevel@tonic-gate LIST(ns_updrec) z_rrlist; 80*7c478bd9Sstevel@tonic-gate LINK(struct zonegrp) z_link; 81*7c478bd9Sstevel@tonic-gate }; 82*7c478bd9Sstevel@tonic-gate 83*7c478bd9Sstevel@tonic-gate #define ZG_F_ZONESECTADDED 0x0001 84*7c478bd9Sstevel@tonic-gate 85*7c478bd9Sstevel@tonic-gate /* Forward. */ 86*7c478bd9Sstevel@tonic-gate 87*7c478bd9Sstevel@tonic-gate static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2); 88*7c478bd9Sstevel@tonic-gate 89*7c478bd9Sstevel@tonic-gate /* Macros. */ 90*7c478bd9Sstevel@tonic-gate 91*7c478bd9Sstevel@tonic-gate #define DPRINTF(x) do {\ 92*7c478bd9Sstevel@tonic-gate int save_errno = errno; \ 93*7c478bd9Sstevel@tonic-gate if ((statp->options & RES_DEBUG) != 0) res_dprintf x; \ 94*7c478bd9Sstevel@tonic-gate errno = save_errno; \ 95*7c478bd9Sstevel@tonic-gate } while (0) 96*7c478bd9Sstevel@tonic-gate 97*7c478bd9Sstevel@tonic-gate /* Public. */ 98*7c478bd9Sstevel@tonic-gate 99*7c478bd9Sstevel@tonic-gate int 100*7c478bd9Sstevel@tonic-gate res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) { 101*7c478bd9Sstevel@tonic-gate ns_updrec *rrecp; 102*7c478bd9Sstevel@tonic-gate u_char answer[PACKETSZ]; 103*7c478bd9Sstevel@tonic-gate u_char *packet; 104*7c478bd9Sstevel@tonic-gate struct zonegrp *zptr, tgrp; 105*7c478bd9Sstevel@tonic-gate LIST(struct zonegrp) zgrps; 106*7c478bd9Sstevel@tonic-gate int nzones = 0, nscount = 0, n; 107*7c478bd9Sstevel@tonic-gate union res_sockaddr_union nsaddrs[MAXNS]; 108*7c478bd9Sstevel@tonic-gate 109*7c478bd9Sstevel@tonic-gate packet = malloc(NS_MAXMSG); 110*7c478bd9Sstevel@tonic-gate if (packet == NULL) { 111*7c478bd9Sstevel@tonic-gate DPRINTF(("malloc failed")); 112*7c478bd9Sstevel@tonic-gate return (0); 113*7c478bd9Sstevel@tonic-gate } 114*7c478bd9Sstevel@tonic-gate /* Thread all of the updates onto a list of groups. */ 115*7c478bd9Sstevel@tonic-gate INIT_LIST(zgrps); 116*7c478bd9Sstevel@tonic-gate memset(&tgrp, 0, sizeof (tgrp)); 117*7c478bd9Sstevel@tonic-gate for (rrecp = rrecp_in; rrecp; 118*7c478bd9Sstevel@tonic-gate rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) { 119*7c478bd9Sstevel@tonic-gate int nscnt; 120*7c478bd9Sstevel@tonic-gate /* Find the origin for it if there is one. */ 121*7c478bd9Sstevel@tonic-gate tgrp.z_class = rrecp->r_class; 122*7c478bd9Sstevel@tonic-gate nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class, 123*7c478bd9Sstevel@tonic-gate RES_EXHAUSTIVE, tgrp.z_origin, 124*7c478bd9Sstevel@tonic-gate sizeof tgrp.z_origin, 125*7c478bd9Sstevel@tonic-gate tgrp.z_nsaddrs, MAXNS); 126*7c478bd9Sstevel@tonic-gate if (nscnt <= 0) { 127*7c478bd9Sstevel@tonic-gate DPRINTF(("res_findzonecut failed (%d)", nscnt)); 128*7c478bd9Sstevel@tonic-gate goto done; 129*7c478bd9Sstevel@tonic-gate } 130*7c478bd9Sstevel@tonic-gate tgrp.z_nscount = nscnt; 131*7c478bd9Sstevel@tonic-gate /* Find the group for it if there is one. */ 132*7c478bd9Sstevel@tonic-gate for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) 133*7c478bd9Sstevel@tonic-gate if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 && 134*7c478bd9Sstevel@tonic-gate tgrp.z_class == zptr->z_class) 135*7c478bd9Sstevel@tonic-gate break; 136*7c478bd9Sstevel@tonic-gate /* Make a group for it if there isn't one. */ 137*7c478bd9Sstevel@tonic-gate if (zptr == NULL) { 138*7c478bd9Sstevel@tonic-gate zptr = malloc(sizeof *zptr); 139*7c478bd9Sstevel@tonic-gate if (zptr == NULL) { 140*7c478bd9Sstevel@tonic-gate DPRINTF(("malloc failed")); 141*7c478bd9Sstevel@tonic-gate goto done; 142*7c478bd9Sstevel@tonic-gate } 143*7c478bd9Sstevel@tonic-gate *zptr = tgrp; 144*7c478bd9Sstevel@tonic-gate zptr->z_flags = 0; 145*7c478bd9Sstevel@tonic-gate INIT_LINK(zptr, z_link); 146*7c478bd9Sstevel@tonic-gate INIT_LIST(zptr->z_rrlist); 147*7c478bd9Sstevel@tonic-gate APPEND(zgrps, zptr, z_link); 148*7c478bd9Sstevel@tonic-gate } 149*7c478bd9Sstevel@tonic-gate /* Thread this rrecp onto the right group. */ 150*7c478bd9Sstevel@tonic-gate APPEND(zptr->z_rrlist, rrecp, r_glink); 151*7c478bd9Sstevel@tonic-gate } 152*7c478bd9Sstevel@tonic-gate 153*7c478bd9Sstevel@tonic-gate for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) { 154*7c478bd9Sstevel@tonic-gate /* Construct zone section and prepend it. */ 155*7c478bd9Sstevel@tonic-gate rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin, 156*7c478bd9Sstevel@tonic-gate zptr->z_class, ns_t_soa, 0); 157*7c478bd9Sstevel@tonic-gate if (rrecp == NULL) { 158*7c478bd9Sstevel@tonic-gate DPRINTF(("res_mkupdrec failed")); 159*7c478bd9Sstevel@tonic-gate goto done; 160*7c478bd9Sstevel@tonic-gate } 161*7c478bd9Sstevel@tonic-gate PREPEND(zptr->z_rrlist, rrecp, r_glink); 162*7c478bd9Sstevel@tonic-gate zptr->z_flags |= ZG_F_ZONESECTADDED; 163*7c478bd9Sstevel@tonic-gate 164*7c478bd9Sstevel@tonic-gate /* Marshall the update message. */ 165*7c478bd9Sstevel@tonic-gate n = res_nmkupdate(statp, HEAD(zptr->z_rrlist), 166*7c478bd9Sstevel@tonic-gate packet, NS_MAXMSG); 167*7c478bd9Sstevel@tonic-gate DPRINTF(("res_mkupdate -> %d", n)); 168*7c478bd9Sstevel@tonic-gate if (n < 0) 169*7c478bd9Sstevel@tonic-gate goto done; 170*7c478bd9Sstevel@tonic-gate 171*7c478bd9Sstevel@tonic-gate /* Temporarily replace the resolver's nameserver set. */ 172*7c478bd9Sstevel@tonic-gate nscount = res_getservers(statp, nsaddrs, MAXNS); 173*7c478bd9Sstevel@tonic-gate res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount); 174*7c478bd9Sstevel@tonic-gate 175*7c478bd9Sstevel@tonic-gate /* Send the update and remember the result. */ 176*7c478bd9Sstevel@tonic-gate if (key != NULL) 177*7c478bd9Sstevel@tonic-gate n = res_nsendsigned(statp, packet, n, key, 178*7c478bd9Sstevel@tonic-gate answer, sizeof answer); 179*7c478bd9Sstevel@tonic-gate else 180*7c478bd9Sstevel@tonic-gate n = res_nsend(statp, packet, n, answer, sizeof answer); 181*7c478bd9Sstevel@tonic-gate if (n < 0) { 182*7c478bd9Sstevel@tonic-gate DPRINTF(("res_nsend: send error, n=%d (%s)\n", 183*7c478bd9Sstevel@tonic-gate n, strerror(errno))); 184*7c478bd9Sstevel@tonic-gate goto done; 185*7c478bd9Sstevel@tonic-gate } 186*7c478bd9Sstevel@tonic-gate if (((HEADER *)answer)->rcode == NOERROR) 187*7c478bd9Sstevel@tonic-gate nzones++; 188*7c478bd9Sstevel@tonic-gate 189*7c478bd9Sstevel@tonic-gate /* Restore resolver's nameserver set. */ 190*7c478bd9Sstevel@tonic-gate res_setservers(statp, nsaddrs, nscount); 191*7c478bd9Sstevel@tonic-gate nscount = 0; 192*7c478bd9Sstevel@tonic-gate } 193*7c478bd9Sstevel@tonic-gate done: 194*7c478bd9Sstevel@tonic-gate while (!EMPTY(zgrps)) { 195*7c478bd9Sstevel@tonic-gate zptr = HEAD(zgrps); 196*7c478bd9Sstevel@tonic-gate if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0) 197*7c478bd9Sstevel@tonic-gate res_freeupdrec(HEAD(zptr->z_rrlist)); 198*7c478bd9Sstevel@tonic-gate UNLINK(zgrps, zptr, z_link); 199*7c478bd9Sstevel@tonic-gate free(zptr); 200*7c478bd9Sstevel@tonic-gate } 201*7c478bd9Sstevel@tonic-gate if (nscount != 0) 202*7c478bd9Sstevel@tonic-gate res_setservers(statp, nsaddrs, nscount); 203*7c478bd9Sstevel@tonic-gate 204*7c478bd9Sstevel@tonic-gate free(packet); 205*7c478bd9Sstevel@tonic-gate return (nzones); 206*7c478bd9Sstevel@tonic-gate } 207*7c478bd9Sstevel@tonic-gate 208*7c478bd9Sstevel@tonic-gate /* Private. */ 209*7c478bd9Sstevel@tonic-gate 210*7c478bd9Sstevel@tonic-gate static void 211*7c478bd9Sstevel@tonic-gate res_dprintf(const char *fmt, ...) { 212*7c478bd9Sstevel@tonic-gate va_list ap; 213*7c478bd9Sstevel@tonic-gate 214*7c478bd9Sstevel@tonic-gate va_start(ap, fmt); 215*7c478bd9Sstevel@tonic-gate fputs(";; res_nupdate: ", stderr); 216*7c478bd9Sstevel@tonic-gate vfprintf(stderr, fmt, ap); 217*7c478bd9Sstevel@tonic-gate fputc('\n', stderr); 218*7c478bd9Sstevel@tonic-gate va_end(ap); 219*7c478bd9Sstevel@tonic-gate } 220