[thirdparty/dhcp.git] / minires / res_update.c

#if !defined(lint) && !defined(SABER)
static const char rcsid[] = "$Id: res_update.c,v 1.12 2001/06/27 00:30:38 mellon Exp $";
#endif /* not lint */

/*
 * 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM 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.
 */

/*
 * Based on the Dynamic DNS reference implementation by Viraj Bais
 * <viraj_bais@ccm.fm.intel.com>
 */

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <errno.h>
#include <limits.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <isc-dhcp/list.h>
#include "minires/minires.h"
#include "arpa/nameser.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;
	struct in_addr z_nsaddrs[MAXNS];
	int z_nscount;
	int z_flags;
	ISC_LIST(ns_updrec) z_rrlist;
	ISC_LINK(struct zonegrp) z_link;
};

#define ZG_F_ZONESECTADDED	0x0001

/* Forward. */

static int	nscopy(struct sockaddr_in *, const struct sockaddr_in *, int);
static int	nsprom(struct sockaddr_in *, const struct in_addr *, int);

void tkey_free (ns_tsig_key **);

isc_result_t
res_nupdate(res_state statp, ns_updrec *rrecp_in) {
	ns_updrec *rrecp;
	double answer[PACKETSZ / sizeof (double)];
	double packet[2*PACKETSZ / sizeof (double)];
	struct zonegrp *zptr, tgrp;
	int nzones = 0, nscount = 0;
	unsigned n;
	unsigned rval;
	struct sockaddr_in nsaddrs[MAXNS];
	ns_tsig_key *key;
	void *zcookie = 0;
	void *zcookp = &zcookie;
	isc_result_t rcode;

      again:
	/* Make sure all the updates are in the same zone, and find out
	   what zone they are in. */
	zptr = NULL;
	for (rrecp = rrecp_in; rrecp; rrecp = ISC_LIST_NEXT(rrecp, r_link)) {
		/* Find the origin for it if there is one. */
		tgrp.z_class = rrecp->r_class;
		rcode = res_findzonecut(statp, rrecp->r_dname, tgrp.z_class,
					RES_EXHAUSTIVE,
					tgrp.z_origin,
					sizeof tgrp.z_origin,
					tgrp.z_nsaddrs, MAXNS, &tgrp.z_nscount,
					zcookp);
		if (rcode != ISC_R_SUCCESS)
			goto done;
		if (tgrp.z_nscount <= 0) {
			rcode = ISC_R_NOTZONE;
			goto done;
		}
		/* Make a group for it if there isn't one. */
		if (zptr == NULL) {
			zptr = malloc(sizeof *zptr);
			if (zptr == NULL) {
				rcode = ISC_R_NOMEMORY;
				goto done;
			}
			*zptr = tgrp;
			zptr->z_flags = 0;
			ISC_LIST_INIT(zptr->z_rrlist);
		} else if (ns_samename(tgrp.z_origin, zptr->z_origin) == 0 ||
			   tgrp.z_class != zptr->z_class) {
			/* Some of the records are in different zones. */
			rcode = ISC_R_CROSSZONE;
			goto done;
		}
		/* Thread this rrecp onto the zone group. */
		ISC_LIST_APPEND(zptr->z_rrlist, rrecp, r_glink);
	}

	/* 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) {
		rcode = ISC_R_UNEXPECTED;
		goto done;
	}
	ISC_LIST_PREPEND(zptr->z_rrlist, rrecp, r_glink);
	zptr->z_flags |= ZG_F_ZONESECTADDED;

	/* Marshall the update message. */
	n = sizeof packet;
	rcode = res_nmkupdate(statp,
			      ISC_LIST_HEAD(zptr->z_rrlist), packet, &n);
	if (rcode != ISC_R_SUCCESS)
		goto done;

	/* Temporarily replace the resolver's nameserver set. */
	nscount = nscopy(nsaddrs, statp->nsaddr_list, statp->nscount);
	statp->nscount = nsprom(statp->nsaddr_list,
				zptr->z_nsaddrs, zptr->z_nscount);

	/* Send the update and remember the result. */
	key = (ns_tsig_key *)0;
	rcode = find_tsig_key (&key, zptr->z_origin, zcookie);
	if (rcode == ISC_R_SUCCESS) {
		rcode = res_nsendsigned(statp, packet, n, key,
					answer, sizeof answer, &rval);
		tkey_free (&key);
	} else if (rcode == ISC_R_NOTFOUND || rcode == ISC_R_KEY_UNKNOWN) {
		rcode = res_nsend(statp, packet, n,
				  answer, sizeof answer, &rval);
	}
	if (rcode != ISC_R_SUCCESS)
		goto undone;

	rcode = ns_rcode_to_isc (((HEADER *)answer)->rcode);
	if (zcookie && rcode == ISC_R_BADSIG) {
		repudiate_zone (&zcookie);
	}

 undone:
	/* Restore resolver's nameserver set. */
	statp->nscount = nscopy(statp->nsaddr_list, nsaddrs, nscount);
	nscount = 0;
 done:
	if (zptr) {
		if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
			res_freeupdrec(ISC_LIST_HEAD(zptr->z_rrlist));
		free(zptr);
	}

	/* If the update failed because we used a cached zone and it
	   didn't work, try it again without the cached zone. */
	if (zcookp && (rcode == ISC_R_NOTZONE || rcode == ISC_R_BADSIG)) {
		zcookp = 0;
		goto again;
	}

	if (zcookie)
		forget_zone (&zcookie);
	return rcode;
}

/* Private. */

static int
nscopy(struct sockaddr_in *dst, const struct sockaddr_in *src, int n) {
	int i;

	for (i = 0; i < n; i++)
		dst[i] = src[i];
	return (n);
}

static int
nsprom(struct sockaddr_in *dst, const struct in_addr *src, int n) {
	int i;

	for (i = 0; i < n; i++) {
		memset(&dst[i], 0, sizeof dst[i]);
		dst[i].sin_family = AF_INET;
		dst[i].sin_port = htons(NS_DEFAULTPORT);
		dst[i].sin_addr = src[i];
	}
	return (n);
}
Commit	Line	Data
3997081b	1	#if !defined(lint) && !defined(SABER)
d758ad8c	2	static const char rcsid[] = "$Id: res_update.c,v 1.12 2001/06/27 00:30:38 mellon Exp $";
3997081b TL	3	#endif /* not lint */
	4
	5	/*
	6	* Copyright (c) 1996-1999 by Internet Software Consortium.
	7	*
	8	* Permission to use, copy, modify, and distribute this software for any
	9	* purpose with or without fee is hereby granted, provided that the above
	10	* copyright notice and this permission notice appear in all copies.
	11	*
	12	* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
	13	* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
	14	* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
	15	* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
	16	* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
	17	* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
	18	* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
	19	* SOFTWARE.
	20	*/
	21
	22	/*
	23	* Based on the Dynamic DNS reference implementation by Viraj Bais
	24	* <viraj_bais@ccm.fm.intel.com>
	25	*/
	26
	27	#include <sys/param.h>
	28	#include <sys/socket.h>
	29	#include <sys/time.h>
	30
	31	#include <netinet/in.h>
	32	#include <arpa/inet.h>
	33
	34	#include <errno.h>
	35	#include <limits.h>
	36	#include <netdb.h>
	37	#include <stdarg.h>
	38	#include <stdio.h>
	39	#include <stdlib.h>
	40	#include <string.h>
	41
d758ad8c	42	#include <isc-dhcp/list.h>
3997081b	43	#include "minires/minires.h"
439a9b00	44	#include "arpa/nameser.h"
3997081b TL	45
	46	/*
	47	* Separate a linked list of records into groups so that all records
	48	* in a group will belong to a single zone on the nameserver.
	49	* Create a dynamic update packet for each zone and send it to the
	50	* nameservers for that zone, and await answer.
	51	* Abort if error occurs in updating any zone.
	52	* Return the number of zones updated on success, < 0 on error.
	53	*
	54	* On error, caller must deal with the unsynchronized zones
	55	* eg. an A record might have been successfully added to the forward
	56	* zone but the corresponding PTR record would be missing if error
	57	* was encountered while updating the reverse zone.
	58	*/
	59
	60	struct zonegrp {
	61	char z_origin[MAXDNAME];
	62	ns_class z_class;
	63	struct in_addr z_nsaddrs[MAXNS];
	64	int z_nscount;
	65	int z_flags;
	66	ISC_LIST(ns_updrec) z_rrlist;
	67	ISC_LINK(struct zonegrp) z_link;
	68	};
	69
	70	#define ZG_F_ZONESECTADDED 0x0001
	71
	72	/* Forward. */
	73
	74	static int nscopy(struct sockaddr_in , const struct sockaddr_in , int);
	75	static int nsprom(struct sockaddr_in , const struct in_addr , int);
3997081b	76
7d9784f6	77	void tkey_free (ns_tsig_key **);
7d9784f6	78
5abf0a44	79	isc_result_t
7d9784f6	80	res_nupdate(res_state statp, ns_updrec *rrecp_in) {
3997081b	81	ns_updrec *rrecp;
47082c65 TL	82	double answer[PACKETSZ / sizeof (double)];
47082c65 TL	83	double packet[2*PACKETSZ / sizeof (double)];
3997081b	84	struct zonegrp *zptr, tgrp;
3997081b TL	85	int nzones = 0, nscount = 0;
3997081b TL	86	unsigned n;
9e051ac9	87	unsigned rval;
3997081b	88	struct sockaddr_in nsaddrs[MAXNS];
7d9784f6	89	ns_tsig_key *key;
b7137154 TL	90	void *zcookie = 0;
b7137154 TL	91	void *zcookp = &zcookie;
5abf0a44	92	isc_result_t rcode;
3997081b	93
b7137154	94	again:
e721773f TL	95	/* Make sure all the updates are in the same zone, and find out
	96	what zone they are in. */
	97	zptr = NULL;
3997081b TL	98	for (rrecp = rrecp_in; rrecp; rrecp = ISC_LIST_NEXT(rrecp, r_link)) {
	99	/* Find the origin for it if there is one. */
	100	tgrp.z_class = rrecp->r_class;
7951fc18	101	rcode = res_findzonecut(statp, rrecp->r_dname, tgrp.z_class,
3997081b TL	102	RES_EXHAUSTIVE,
	103	tgrp.z_origin,
	104	sizeof tgrp.z_origin,
7951fc18 TL	105	tgrp.z_nsaddrs, MAXNS, &tgrp.z_nscount,
7951fc18 TL	106	zcookp);
5abf0a44	107	if (rcode != ISC_R_SUCCESS)
7951fc18	108	goto done;
3997081b	109	if (tgrp.z_nscount <= 0) {
5abf0a44	110	rcode = ISC_R_NOTZONE;
3997081b TL	111	goto done;
3997081b TL	112	}
3997081b TL	113	/* Make a group for it if there isn't one. */
	114	if (zptr == NULL) {
	115	zptr = malloc(sizeof *zptr);
	116	if (zptr == NULL) {
5abf0a44	117	rcode = ISC_R_NOMEMORY;
3997081b TL	118	goto done;
	119	}
	120	*zptr = tgrp;
	121	zptr->z_flags = 0;
	122	ISC_LIST_INIT(zptr->z_rrlist);
e721773f TL	123	} else if (ns_samename(tgrp.z_origin, zptr->z_origin) == 0 \|\|
	124	tgrp.z_class != zptr->z_class) {
	125	/* Some of the records are in different zones. */
5abf0a44	126	rcode = ISC_R_CROSSZONE;
e721773f	127	goto done;
3997081b	128	}
e721773f	129	/* Thread this rrecp onto the zone group. */
3997081b TL	130	ISC_LIST_APPEND(zptr->z_rrlist, rrecp, r_glink);
	131	}
	132
e721773f TL	133	/* Construct zone section and prepend it. */
	134	rrecp = res_mkupdrec(ns_s_zn, zptr->z_origin,
	135	zptr->z_class, ns_t_soa, 0);
	136	if (rrecp == NULL) {
d758ad8c	137	rcode = ISC_R_UNEXPECTED;
e721773f TL	138	goto done;
	139	}
	140	ISC_LIST_PREPEND(zptr->z_rrlist, rrecp, r_glink);
	141	zptr->z_flags \|= ZG_F_ZONESECTADDED;
	142
	143	/* Marshall the update message. */
45e52bde	144	n = sizeof packet;
5abf0a44 TL	145	rcode = res_nmkupdate(statp,
	146	ISC_LIST_HEAD(zptr->z_rrlist), packet, &n);
	147	if (rcode != ISC_R_SUCCESS)
e721773f	148	goto done;
3997081b	149
e721773f TL	150	/* Temporarily replace the resolver's nameserver set. */
	151	nscount = nscopy(nsaddrs, statp->nsaddr_list, statp->nscount);
	152	statp->nscount = nsprom(statp->nsaddr_list,
	153	zptr->z_nsaddrs, zptr->z_nscount);
	154
	155	/* Send the update and remember the result. */
7d9784f6	156	key = (ns_tsig_key *)0;
d758ad8c TL	157	rcode = find_tsig_key (&key, zptr->z_origin, zcookie);
d758ad8c TL	158	if (rcode == ISC_R_SUCCESS) {
5abf0a44 TL	159	rcode = res_nsendsigned(statp, packet, n, key,
5abf0a44 TL	160	answer, sizeof answer, &rval);
7d9784f6	161	tkey_free (&key);
d758ad8c	162	} else if (rcode == ISC_R_NOTFOUND \|\| rcode == ISC_R_KEY_UNKNOWN) {
5abf0a44 TL	163	rcode = res_nsend(statp, packet, n,
5abf0a44 TL	164	answer, sizeof answer, &rval);
7d9784f6	165	}
d758ad8c	166	if (rcode != ISC_R_SUCCESS)
e721773f	167	goto undone;
d758ad8c	168
5abf0a44 TL	169	rcode = ns_rcode_to_isc (((HEADER *)answer)->rcode);
5abf0a44 TL	170	if (zcookie && rcode == ISC_R_BADSIG) {
b7137154 TL	171	repudiate_zone (&zcookie);
b7137154 TL	172	}
e721773f TL	173
	174	undone:
	175	/* Restore resolver's nameserver set. */
	176	statp->nscount = nscopy(statp->nsaddr_list, nsaddrs, nscount);
	177	nscount = 0;
3997081b	178	done:
e721773f	179	if (zptr) {
3997081b TL	180	if ((zptr->z_flags & ZG_F_ZONESECTADDED) != 0)
3997081b TL	181	res_freeupdrec(ISC_LIST_HEAD(zptr->z_rrlist));
3997081b TL	182	free(zptr);
3997081b TL	183	}
3997081b	184
b7137154 TL	185	/* If the update failed because we used a cached zone and it
b7137154 TL	186	didn't work, try it again without the cached zone. */
5abf0a44	187	if (zcookp && (rcode == ISC_R_NOTZONE \|\| rcode == ISC_R_BADSIG)) {
b7137154 TL	188	zcookp = 0;
	189	goto again;
	190	}
	191
	192	if (zcookie)
	193	forget_zone (&zcookie);
e721773f	194	return rcode;
3997081b TL	195	}
	196
	197	/* Private. */
	198
	199	static int
	200	nscopy(struct sockaddr_in dst, const struct sockaddr_in src, int n) {
	201	int i;
	202
	203	for (i = 0; i < n; i++)
	204	dst[i] = src[i];
	205	return (n);
	206	}
	207
	208	static int
	209	nsprom(struct sockaddr_in dst, const struct in_addr src, int n) {
	210	int i;
	211
	212	for (i = 0; i < n; i++) {
	213	memset(&dst[i], 0, sizeof dst[i]);
	214	dst[i].sin_family = AF_INET;
	215	dst[i].sin_port = htons(NS_DEFAULTPORT);
	216	dst[i].sin_addr = src[i];
	217	}
	218	return (n);
	219	}