/* $NetBSD: res_update.c,v 1.1.1.2 2012/09/09 16:08:08 christos Exp $ */ #if !defined(lint) && !defined(SABER) static const char rcsid[] = "Id: res_update.c,v 1.13 2005/04/27 04:56:43 sra Exp "; #endif /* not lint */ /* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * Copyright (c) 1996-1999 by Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /*! \file * \brief * Based on the Dynamic DNS reference implementation by Viraj Bais * <viraj_bais@ccm.fm.intel.com> */ #include "port_before.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "port_after.h" #include "res_private.h" /*% * Separate a linked list of records into groups so that all records * in a group will belong to a single zone on the nameserver. * Create a dynamic update packet for each zone and send it to the * nameservers for that zone, and await answer. * Abort if error occurs in updating any zone. * Return the number of zones updated on success, < 0 on error. * * On error, caller must deal with the unsynchronized zones * eg. an A record might have been successfully added to the forward * zone but the corresponding PTR record would be missing if error * was encountered while updating the reverse zone. */ struct zonegrp { char z_origin[MAXDNAME]; ns_class z_class; union res_sockaddr_union z_nsaddrs[MAXNS]; int z_nscount; int z_flags; LIST(ns_updrec) z_rrlist; LINK(struct zonegrp) z_link; }; #define ZG_F_ZONESECTADDED 0x0001 /* Forward. */ static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2); /* Macros. */ #define DPRINTF(x) do {\ int save_errno = errno; \ if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \ errno = save_errno; \ } while (0) /* Public. */ int res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) { ns_updrec *rrecp; u_char answer[PACKETSZ]; u_char *packet; struct zonegrp *zptr, tgrp; LIST(struct zonegrp) zgrps; int nzones = 0, nscount = 0, n; union res_sockaddr_union nsaddrs[MAXNS]; packet = malloc(NS_MAXMSG); if (packet == NULL) { DPRINTF(("malloc failed")); return (0); } /* Thread all of the updates onto a list of groups. */ INIT_LIST(zgrps); memset(&tgrp, 0, sizeof (tgrp)); for (rrecp = rrecp_in; rrecp; rrecp = LINKED(rrecp, r_link) ? NEXT(rrecp, r_link) : NULL) { int nscnt; /* Find the origin for it if there is one. */ tgrp.z_class = rrecp->r_class; nscnt = res_findzonecut2(statp, rrecp->r_dname, tgrp.z_class, RES_EXHAUSTIVE, tgrp.z_origin, sizeof tgrp.z_origin, tgrp.z_nsaddrs, MAXNS); if (nscnt <= 0) { DPRINTF(("res_findzonecut failed (%d)", nscnt)); goto done; } tgrp.z_nscount = nscnt; /* Find the group for it if there is one. */ for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) if (ns_samename(tgrp.z_origin, zptr->z_origin) == 1 && tgrp.z_class == zptr->z_class) break; /* Make a group for it if there isn't one. */ if (zptr == NULL) { zptr = malloc(sizeof *zptr); if (zptr == NULL) { DPRINTF(("malloc failed")); goto done; } *zptr = tgrp; zptr->z_flags = 0; INIT_LINK(zptr, z_link); INIT_LIST(zptr->z_rrlist); APPEND(zgrps, zptr, z_link); } /* Thread this rrecp onto the right group. */ APPEND(zptr->z_rrlist, rrecp, r_glink); } for (zptr = HEAD(zgrps); zptr != NULL; zptr = NEXT(zptr, z_link)) { /* Construct zone section and prepend it. */ rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin, zptr->z_class, ns_t_soa, 0); if (rrecp == NULL) { DPRINTF(("res_mkupdrec failed")); goto done; } PREPEND(zptr->z_rrlist, rrecp, r_glink); zptr->z_flags |= ZG_F_ZONESECTADDED; /* Marshall the update message. */ n = res_nmkupdate(statp, HEAD(zptr->z_rrlist), packet, NS_MAXMSG); DPRINTF(("res_mkupdate -> %d", n)); if (n < 0) goto done; /* Temporarily replace the resolver's nameserver set. */ nscount = res_getservers(statp, nsaddrs, MAXNS); res_setservers(statp, zptr->z_nsaddrs, zptr->z_nscount); /* Send the update and remember the result. */ if (key != NULL) n = res_nsendsigned(statp, packet, n, key, answer, sizeof answer); else n = res_nsend(statp, packet, n, answer, sizeof answer); if (n < 0) { DPRINTF(("res_nsend: send error, n=%d (%s)\n", n, strerror(errno))); goto done; } if (((HEADER *)answer)->rcode == NOERROR) nzones++; /* Restore resolver's nameserver set. */ res_setservers(statp, nsaddrs, nscount); nscount = 0; } done: while (!EMPTY(zgrps)) { zptr = HEAD(zgrps); if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0) res_freeupdrec(HEAD(zptr->z_rrlist)); UNLINK(zgrps, zptr, z_link); free(zptr); } if (nscount != 0) res_setservers(statp, nsaddrs, nscount); free(packet); return (nzones); } /* Private. */ static void res_dprintf(const char *fmt, ...) { va_list ap; va_start(ap, fmt); fputs(";; res_nupdate: ", stderr); vfprintf(stderr, fmt, ap); fputc('\n', stderr); va_end(ap); }