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 /*	$NetBSD: res_mkquery.c,v 1.6 2006/01/24 17:40:32 christos Exp $	*/

 /*

  * Copyright (c) 2008  Android Open Source Project (query id randomization)

  * Copyright (c) 1985, 1993

  *    The Regents of the University of California.  All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  * 1. Redistributions of source code must retain the above copyright

  *    notice, this list of conditions and the following disclaimer.

  * 2. Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in the

  *    documentation and/or other materials provided with the distribution.

  * 3. All advertising materials mentioning features or use of this software

  *    must display the following acknowledgement:

  * 	This product includes software developed by the University of

  * 	California, Berkeley and its contributors.

  * 4. Neither the name of the University nor the names of its contributors

  *    may be used to endorse or promote products derived from this software

  *    without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

  * SUCH DAMAGE.

  */

 /*

  * Portions Copyright (c) 1993 by Digital Equipment Corporation.

  *

  * 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, and that

  * the name of Digital Equipment Corporation not be used in advertising or

  * publicity pertaining to distribution of the document or software without

  * specific, written prior permission.

  *

  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL

  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES

  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT

  * CORPORATION 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.

  */

 /*

  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")

  * Portions 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.

  */

 /*

  * This version of this file is derived from Android 2.3 "Gingerbread",

  * which contains uncredited changes by Android/Google developers.  It has

  * been modified in 2011 for use in the Android build of Mozilla Firefox by

  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,

  * and Steve Workman <sjhworkman@gmail.com>).

  * These changes are offered under the same license as the original NetBSD

  * file, whose copyright and license are unchanged above.

  */

 #define ANDROID_CHANGES 1

 #define MOZILLA_NECKO_EXCLUDE_CODE 1

 #include <sys/cdefs.h>

 #if defined(LIBC_SCCS) && !defined(lint)

 #ifdef notdef

 static const char sccsid[] = "@(#)res_mkquery.c	8.1 (Berkeley) 6/4/93";

 static const char rcsid[] = "Id: res_mkquery.c,v 1.1.2.2.4.2 2004/03/16 12:34:18 marka Exp";

 #else

 __RCSID("$NetBSD: res_mkquery.c,v 1.6 2006/01/24 17:40:32 christos Exp $");

 #endif

 #endif /* LIBC_SCCS and not lint */

 #include <sys/types.h>

 #include <sys/param.h>

 #include <netinet/in.h>

 #include "arpa_nameser.h"

 #include <netdb.h>

 #ifdef ANDROID_CHANGES

 #include "resolv_private.h"

 #else

 #include <resolv.h>

 #endif

 #include <stdio.h>

 #include <string.h>

 /* Options.  Leave them on. */

 #ifndef DEBUG

 #define DEBUG

 #endif

 #ifndef lint

 #define UNUSED(a)	(void)&a

 #else

 #define UNUSED(a)	a = a

 #endif

 extern const char *_res_opcodes[];

 /*

  * Form all types of queries.

  * Returns the size of the result or -1.

  */

 int

 res_nmkquery(res_state statp,

 	     int op,			/* opcode of query */

 	     const char *dname,		/* domain name */

 	     int class, int type,	/* class and type of query */

 	     const u_char *data,	/* resource record data */

 	     int datalen,		/* length of data */

 	     const u_char *newrr_in,	/* new rr for modify or append */

 	     u_char *buf,		/* buffer to put query */

 	     int buflen)		/* size of buffer */

 {

 	register HEADER *hp;

 	register u_char *cp, *ep;

 	register int n;

 	u_char *dnptrs[20], **dpp, **lastdnptr;

 	UNUSED(newrr_in);

 #ifdef DEBUG

 	if (statp->options & RES_DEBUG)

 		printf(";; res_nmkquery(%s, %s, %s, %s)\n",

 		       _res_opcodes[op], dname, p_class(class), p_type(type));

 #endif

 	/*

 	 * Initialize header fields.

 	 */

 	if ((buf == NULL) || (buflen < HFIXEDSZ))

 		return (-1);

 	memset(buf, 0, HFIXEDSZ);

 	hp = (HEADER *)(void *)buf;

 	hp->id = htons(res_randomid());

 	hp->opcode = op;

 	hp->rd = (statp->options & RES_RECURSE) != 0U;

 	hp->rcode = NOERROR;

 	cp = buf + HFIXEDSZ;

 	ep = buf + buflen;

 	dpp = dnptrs;

 	*dpp++ = buf;

 	*dpp++ = NULL;

 	lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];

 	/*

 	 * perform opcode specific processing

 	 */

 	switch (op) {

 	case QUERY:	/*FALLTHROUGH*/

 	case NS_NOTIFY_OP:

 		if (ep - cp < QFIXEDSZ)

 			return (-1);

 		if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,

 		    lastdnptr)) < 0)

 			return (-1);

 		cp += n;

 		ns_put16(type, cp);

 		cp += INT16SZ;

 		ns_put16(class, cp);

 		cp += INT16SZ;

 		hp->qdcount = htons(1);

 		if (op == QUERY || data == NULL)

 			break;

 		/*

 		 * Make an additional record for completion domain.

 		 */

 		if ((ep - cp) < RRFIXEDSZ)

 			return (-1);

 		n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,

 			    dnptrs, lastdnptr);

 		if (n < 0)

 			return (-1);

 		cp += n;

 		ns_put16(T_NULL, cp);

 		cp += INT16SZ;

 		ns_put16(class, cp);

 		cp += INT16SZ;

 		ns_put32(0, cp);

 		cp += INT32SZ;

 		ns_put16(0, cp);

 		cp += INT16SZ;

 		hp->arcount = htons(1);

 		break;

 	case IQUERY:

 		/*

 		 * Initialize answer section

 		 */

 		if (ep - cp < 1 + RRFIXEDSZ + datalen)

 			return (-1);

 		*cp++ = '\0';	/* no domain name */

 		ns_put16(type, cp);

 		cp += INT16SZ;

 		ns_put16(class, cp);

 		cp += INT16SZ;

 		ns_put32(0, cp);

 		cp += INT32SZ;

 		ns_put16(datalen, cp);

 		cp += INT16SZ;

 		if (datalen) {

 			memcpy(cp, data, (size_t)datalen);

 			cp += datalen;

 		}

 		hp->ancount = htons(1);

 		break;

 	default:

 		return (-1);

 	}

 	return (cp - buf);

 }

 #ifdef RES_USE_EDNS0

 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */

 #ifndef T_OPT

 #define T_OPT	41

 #endif

 int

 res_nopt(res_state statp,

 	 int n0,		/* current offset in buffer */

 	 u_char *buf,		/* buffer to put query */

 	 int buflen,		/* size of buffer */

 	 int anslen)		/* UDP answer buffer size */

 {

 	register HEADER *hp;

 	register u_char *cp, *ep;

 	u_int16_t flags = 0;

 #ifdef DEBUG

 	if ((statp->options & RES_DEBUG) != 0U)

 		printf(";; res_nopt()\n");

 #endif

 	hp = (HEADER *)(void *)buf;

 	cp = buf + n0;

 	ep = buf + buflen;

 	if ((ep - cp) < 1 + RRFIXEDSZ)

 		return (-1);

 	*cp++ = 0;	/* "." */

 	ns_put16(T_OPT, cp);	/* TYPE */

 	cp += INT16SZ;

 	ns_put16(anslen & 0xffff, cp);	/* CLASS = UDP payload size */

 	cp += INT16SZ;

 	*cp++ = NOERROR;	/* extended RCODE */

 	*cp++ = 0;		/* EDNS version */

 	if (statp->options & RES_USE_DNSSEC) {

 #ifdef DEBUG

 		if (statp->options & RES_DEBUG)

 			printf(";; res_opt()... ENDS0 DNSSEC\n");

 #endif

 		flags |= NS_OPT_DNSSEC_OK;

 	}

 	ns_put16(flags, cp);

 	cp += INT16SZ;

 	ns_put16(0, cp);	/* RDLEN */

 	cp += INT16SZ;

 	hp->arcount = htons(ntohs(hp->arcount) + 1);

 	return (cp - buf);

 }

 #endif