Annotation of src/lib/libresolv/res_update.c, Revision 1.1
1.1 ! christos 1: /* $NetBSD: res_update.c,v 1.1.1.2 2012/09/09 16:08:08 christos Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
! 5: * Copyright (c) 1996-1999 by Internet Software Consortium.
! 6: *
! 7: * Permission to use, copy, modify, and distribute this software for any
! 8: * purpose with or without fee is hereby granted, provided that the above
! 9: * copyright notice and this permission notice appear in all copies.
! 10: *
! 11: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
! 12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
! 14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
! 17: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 18: */
! 19:
! 20: /*! \file
! 21: * \brief
! 22: * Based on the Dynamic DNS reference implementation by Viraj Bais
! 23: * <viraj_bais@ccm.fm.intel.com>
! 24: */
! 25: #include <sys/cdefs.h>
! 26: #if 0
! 27: static const char rcsid[] = "Id: res_update.c,v 1.13 2005/04/27 04:56:43 sra Exp ";
! 28: #else
! 29: __RCSID("$NetBSD$");
! 30: #endif
! 31:
! 32:
! 33: #include "port_before.h"
! 34:
! 35: #include <sys/param.h>
! 36: #include <sys/socket.h>
! 37: #include <sys/time.h>
! 38:
! 39: #include <netinet/in.h>
! 40: #include <arpa/inet.h>
! 41: #include <arpa/nameser.h>
! 42:
! 43: #include <errno.h>
! 44: #include <limits.h>
! 45: #include <netdb.h>
! 46: #include <res_update.h>
! 47: #include <stdarg.h>
! 48: #include <stdio.h>
! 49: #include <stdlib.h>
! 50: #include <string.h>
! 51:
! 52: #include <isc/list.h>
! 53: #include <resolv.h>
! 54:
! 55: #include "port_after.h"
! 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:
! 72: struct zonegrp {
! 73: char z_origin[MAXDNAME];
! 74: ns_class z_class;
! 75: union res_sockaddr_union z_nsaddrs[MAXNS];
! 76: int z_nscount;
! 77: int z_flags;
! 78: TAILQ_HEAD(, ns_updrec) z_rrlist;
! 79: TAILQ_ENTRY(zonegrp) z_link;
! 80: };
! 81:
! 82: #define ZG_F_ZONESECTADDED 0x0001
! 83:
! 84: /* Forward. */
! 85:
! 86: static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2);
! 87:
! 88: /* Macros. */
! 89:
! 90: #define DPRINTF(x) do {\
! 91: int save_errno = errno; \
! 92: if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \
! 93: errno = save_errno; \
! 94: } while (/*CONSTCOND*/0)
! 95:
! 96: /* Public. */
! 97:
! 98: int
! 99: res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) {
! 100: ns_updrec *rrecp;
! 101: u_char answer[PACKETSZ];
! 102: u_char *packet;
! 103: struct zonegrp *zptr, tgrp;
! 104: TAILQ_HEAD(, zonegrp) zgrps;
! 105: int nzones = 0, nscount = 0, n;
! 106: union res_sockaddr_union nsaddrs[MAXNS];
! 107:
! 108: packet = malloc(NS_MAXMSG);
! 109: if (packet == NULL) {
! 110: DPRINTF(("malloc failed"));
! 111: return (0);
! 112: }
! 113: /* Thread all of the updates onto a list of groups. */
! 114: TAILQ_INIT(&zgrps);
! 115: memset(&tgrp, 0, sizeof (tgrp));
! 116: for (rrecp = rrecp_in; rrecp; rrecp = TAILQ_NEXT(rrecp, r_link)) {
! 117: int nscnt;
! 118: /* Find the origin for it if there is one. */
! 119: tgrp.z_class = rrecp->r_class;
! 120: nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class,
! 121: RES_EXHAUSTIVE, tgrp.z_origin,
! 122: sizeof tgrp.z_origin,
! 123: tgrp.z_nsaddrs, MAXNS);
! 124: if (nscnt <= 0) {
! 125: DPRINTF(("res_findzonecut failed (%d)", nscnt));
! 126: goto done;
! 127: }
! 128: tgrp.z_nscount = nscnt;
! 129: /* Find the group for it if there is one. */
! 130: TAILQ_FOREACH(zptr, &zgrps, z_link)
! 131: if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 &&
! 132: tgrp.z_class == zptr->z_class)
! 133: break;
! 134: /* Make a group for it if there isn't one. */
! 135: if (zptr == NULL) {
! 136: zptr = malloc(sizeof *zptr);
! 137: if (zptr == NULL) {
! 138: DPRINTF(("malloc failed"));
! 139: goto done;
! 140: }
! 141: *zptr = tgrp;
! 142: zptr->z_flags = 0;
! 143: TAILQ_INIT(&zptr->z_rrlist);
! 144: TAILQ_INSERT_TAIL(&zgrps, zptr, z_link);
! 145: }
! 146: /* Thread this rrecp onto the right group. */
! 147: TAILQ_INSERT_TAIL(&zptr->z_rrlist, rrecp, r_glink);
! 148: }
! 149:
! 150: TAILQ_FOREACH(zptr, &zgrps, z_link) {
! 151: HEADER h;
! 152: /* Construct zone section and prepend it. */
! 153: rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
! 154: (u_int)zptr->z_class, ns_t_soa, 0);
! 155: if (rrecp == NULL) {
! 156: DPRINTF(("res_mkupdrec failed"));
! 157: goto done;
! 158: }
! 159: TAILQ_INSERT_HEAD(&zptr->z_rrlist, rrecp, r_glink);
! 160: zptr->z_flags |= ZG_F_ZONESECTADDED;
! 161:
! 162: /* Marshall the update message. */
! 163: n = res_nmkupdate(statp, TAILQ_FIRST(&zptr->z_rrlist),
! 164: packet, NS_MAXMSG);
! 165: DPRINTF(("res_mkupdate -> %d", n));
! 166: if (n < 0)
! 167: goto done;
! 168:
! 169: /* Temporarily replace the resolver's nameserver set. */
! 170: nscount = res_getservers(statp, nsaddrs, MAXNS);
! 171: res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount);
! 172:
! 173: /* Send the update and remember the result. */
! 174: if (key != NULL)
! 175: n = res_nsendsigned(statp, packet, n, key,
! 176: answer, (int)sizeof answer);
! 177: else
! 178: n = res_nsend(statp, packet, n, answer,
! 179: (int)sizeof answer);
! 180: if (n < 0) {
! 181: DPRINTF(("res_nsend: send error, n=%d (%s)\n",
! 182: n, strerror(errno)));
! 183: goto done;
! 184: }
! 185: memcpy(&h, answer, sizeof(h));
! 186: if (h.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 (!TAILQ_EMPTY(&zgrps)) {
! 195: zptr = TAILQ_FIRST(&zgrps);
! 196: if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
! 197: res_freeupdrec(TAILQ_FIRST(&zptr->z_rrlist));
! 198: TAILQ_REMOVE(&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: }
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