Annotation of embedaddon/dhcp/minires/res_update.c, revision 1.1
1.1 ! misho 1: #if !defined(lint) && !defined(SABER)
! 2: static const char rcsid[] = "$Id: res_update.c,v 1.15.310.2 2009-07-24 22:04:52 sar Exp $";
! 3: #endif /* not lint */
! 4:
! 5: /*
! 6: * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
! 7: * Copyright (c) 1996-2003 by Internet Software Consortium
! 8: *
! 9: * Permission to use, copy, modify, and distribute this software for any
! 10: * purpose with or without fee is hereby granted, provided that the above
! 11: * copyright notice and this permission notice appear in all copies.
! 12: *
! 13: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
! 14: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 15: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
! 16: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 17: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 18: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
! 19: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 20: *
! 21: * Internet Systems Consortium, Inc.
! 22: * 950 Charter Street
! 23: * Redwood City, CA 94063
! 24: * <info@isc.org>
! 25: * https://www.isc.org/
! 26: */
! 27:
! 28: /*
! 29: * Based on the Dynamic DNS reference implementation by Viraj Bais
! 30: * <viraj_bais@ccm.fm.intel.com>
! 31: */
! 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:
! 40: #include <errno.h>
! 41: #include <limits.h>
! 42: #include <netdb.h>
! 43: #include <stdarg.h>
! 44: #include <stdio.h>
! 45: #include <stdlib.h>
! 46: #include <string.h>
! 47:
! 48: #include <isc-dhcp/list.h>
! 49: #include "minires/minires.h"
! 50: #include "arpa/nameser.h"
! 51:
! 52: /*
! 53: * Separate a linked list of records into groups so that all records
! 54: * in a group will belong to a single zone on the nameserver.
! 55: * Create a dynamic update packet for each zone and send it to the
! 56: * nameservers for that zone, and await answer.
! 57: * Abort if error occurs in updating any zone.
! 58: * Return the number of zones updated on success, < 0 on error.
! 59: *
! 60: * On error, caller must deal with the unsynchronized zones
! 61: * eg. an A record might have been successfully added to the forward
! 62: * zone but the corresponding PTR record would be missing if error
! 63: * was encountered while updating the reverse zone.
! 64: */
! 65:
! 66: struct zonegrp {
! 67: char z_origin[MAXDNAME];
! 68: ns_class z_class;
! 69: struct in_addr z_nsaddrs[MAXNS];
! 70: int z_nscount;
! 71: int z_flags;
! 72: ISC_LIST(ns_updrec) z_rrlist;
! 73: ISC_LINK(struct zonegrp) z_link;
! 74: };
! 75:
! 76: #define ZG_F_ZONESECTADDED 0x0001
! 77:
! 78: /* Forward. */
! 79:
! 80: static int nscopy(struct sockaddr_in *, const struct sockaddr_in *, int);
! 81: static int nsprom(struct sockaddr_in *, const struct in_addr *, int);
! 82:
! 83: void tkey_free (ns_tsig_key **);
! 84:
! 85: isc_result_t
! 86: res_nupdate(res_state statp, ns_updrec *rrecp_in) {
! 87: ns_updrec *rrecp;
! 88: double answer[PACKETSZ / sizeof (double)];
! 89: double packet[2*PACKETSZ / sizeof (double)];
! 90: struct zonegrp *zptr, tgrp;
! 91: int nscount = 0;
! 92: unsigned n;
! 93: unsigned rval;
! 94: struct sockaddr_in nsaddrs[MAXNS];
! 95: ns_tsig_key *key;
! 96: void *zcookie = 0;
! 97: void *zcookp = &zcookie;
! 98: isc_result_t rcode;
! 99:
! 100: again:
! 101: /* Make sure all the updates are in the same zone, and find out
! 102: what zone they are in. */
! 103: zptr = NULL;
! 104: for (rrecp = rrecp_in; rrecp; rrecp = ISC_LIST_NEXT(rrecp, r_link)) {
! 105: /* Find the origin for it if there is one. */
! 106: tgrp.z_class = rrecp->r_class;
! 107: rcode = res_findzonecut(statp, rrecp->r_dname, tgrp.z_class,
! 108: RES_EXHAUSTIVE,
! 109: tgrp.z_origin,
! 110: sizeof tgrp.z_origin,
! 111: tgrp.z_nsaddrs, MAXNS, &tgrp.z_nscount,
! 112: zcookp);
! 113: if (rcode != ISC_R_SUCCESS)
! 114: goto done;
! 115: if (tgrp.z_nscount <= 0) {
! 116: rcode = ISC_R_NOTZONE;
! 117: goto done;
! 118: }
! 119: /* Make a group for it if there isn't one. */
! 120: if (zptr == NULL) {
! 121: zptr = malloc(sizeof *zptr);
! 122: if (zptr == NULL) {
! 123: rcode = ISC_R_NOMEMORY;
! 124: goto done;
! 125: }
! 126: *zptr = tgrp;
! 127: zptr->z_flags = 0;
! 128: ISC_LIST_INIT(zptr->z_rrlist);
! 129: } else if (ns_samename(tgrp.z_origin, zptr->z_origin) == 0 ||
! 130: tgrp.z_class != zptr->z_class) {
! 131: /* Some of the records are in different zones. */
! 132: rcode = ISC_R_CROSSZONE;
! 133: goto done;
! 134: }
! 135: /* Thread this rrecp onto the zone group. */
! 136: ISC_LIST_APPEND(zptr->z_rrlist, rrecp, r_glink);
! 137: }
! 138:
! 139: /* Construct zone section and prepend it. */
! 140: rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
! 141: zptr->z_class, ns_t_soa, 0);
! 142: if (rrecp == NULL) {
! 143: rcode = ISC_R_UNEXPECTED;
! 144: goto done;
! 145: }
! 146: ISC_LIST_PREPEND(zptr->z_rrlist, rrecp, r_glink);
! 147: zptr->z_flags |= ZG_F_ZONESECTADDED;
! 148:
! 149: /* Marshall the update message. */
! 150: n = sizeof packet;
! 151: rcode = res_nmkupdate(statp,
! 152: ISC_LIST_HEAD(zptr->z_rrlist), packet, &n);
! 153: if (rcode != ISC_R_SUCCESS)
! 154: goto done;
! 155:
! 156: /* Temporarily replace the resolver's nameserver set. */
! 157: nscount = nscopy(nsaddrs, statp->nsaddr_list, statp->nscount);
! 158: statp->nscount = nsprom(statp->nsaddr_list,
! 159: zptr->z_nsaddrs, zptr->z_nscount);
! 160:
! 161: /* Send the update and remember the result. */
! 162: key = (ns_tsig_key *)0;
! 163: rcode = find_tsig_key (&key, zptr->z_origin, zcookie);
! 164: if (rcode == ISC_R_SUCCESS) {
! 165: rcode = res_nsendsigned(statp, packet, n, key,
! 166: answer, sizeof answer, &rval);
! 167: tkey_free (&key);
! 168: } else if (rcode == ISC_R_NOTFOUND || rcode == ISC_R_KEY_UNKNOWN) {
! 169: rcode = res_nsend(statp, packet, n,
! 170: answer, sizeof answer, &rval);
! 171: }
! 172: if (rcode != ISC_R_SUCCESS)
! 173: goto undone;
! 174:
! 175: rcode = ns_rcode_to_isc (((HEADER *)answer)->rcode);
! 176: if (zcookie && rcode == ISC_R_BADSIG) {
! 177: repudiate_zone (&zcookie);
! 178: }
! 179:
! 180: undone:
! 181: /* Restore resolver's nameserver set. */
! 182: statp->nscount = nscopy(statp->nsaddr_list, nsaddrs, nscount);
! 183: nscount = 0;
! 184: done:
! 185: if (zptr) {
! 186: if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
! 187: res_freeupdrec(ISC_LIST_HEAD(zptr->z_rrlist));
! 188: free(zptr);
! 189: }
! 190:
! 191: /* If the update failed because we used a cached zone and it
! 192: didn't work, try it again without the cached zone. */
! 193: if (zcookp && (rcode == ISC_R_NOTZONE || rcode == ISC_R_BADSIG)) {
! 194: zcookp = 0;
! 195: goto again;
! 196: }
! 197:
! 198: if (zcookie)
! 199: forget_zone (&zcookie);
! 200: return rcode;
! 201: }
! 202:
! 203: /* Private. */
! 204:
! 205: static int
! 206: nscopy(struct sockaddr_in *dst, const struct sockaddr_in *src, int n) {
! 207: int i;
! 208:
! 209: for (i = 0; i < n; i++)
! 210: dst[i] = src[i];
! 211: return (n);
! 212: }
! 213:
! 214: static int
! 215: nsprom(struct sockaddr_in *dst, const struct in_addr *src, int n) {
! 216: int i;
! 217:
! 218: for (i = 0; i < n; i++) {
! 219: memset(&dst[i], 0, sizeof dst[i]);
! 220: dst[i].sin_family = AF_INET;
! 221: dst[i].sin_port = htons(NS_DEFAULTPORT);
! 222: dst[i].sin_addr = src[i];
! 223: }
! 224: return (n);
! 225: }
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