michael@0: /*	$NetBSD: res_mkquery.c,v 1.6 2006/01/24 17:40:32 christos Exp $	*/
michael@0: 
michael@0: /*
michael@0:  * Copyright (c) 2008  Android Open Source Project (query id randomization)
michael@0:  * Copyright (c) 1985, 1993
michael@0:  *    The Regents of the University of California.  All rights reserved.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  * 1. Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  * 2. Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in the
michael@0:  *    documentation and/or other materials provided with the distribution.
michael@0:  * 3. All advertising materials mentioning features or use of this software
michael@0:  *    must display the following acknowledgement:
michael@0:  * 	This product includes software developed by the University of
michael@0:  * 	California, Berkeley and its contributors.
michael@0:  * 4. Neither the name of the University nor the names of its contributors
michael@0:  *    may be used to endorse or promote products derived from this software
michael@0:  *    without specific prior written permission.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
michael@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
michael@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
michael@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
michael@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
michael@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
michael@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
michael@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
michael@0:  * SUCH DAMAGE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
michael@0:  *
michael@0:  * Permission to use, copy, modify, and distribute this software for any
michael@0:  * purpose with or without fee is hereby granted, provided that the above
michael@0:  * copyright notice and this permission notice appear in all copies, and that
michael@0:  * the name of Digital Equipment Corporation not be used in advertising or
michael@0:  * publicity pertaining to distribution of the document or software without
michael@0:  * specific, written prior permission.
michael@0:  *
michael@0:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
michael@0:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
michael@0:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
michael@0:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
michael@0:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
michael@0:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
michael@0:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
michael@0:  * SOFTWARE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
michael@0:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
michael@0:  *
michael@0:  * Permission to use, copy, modify, and distribute this software for any
michael@0:  * purpose with or without fee is hereby granted, provided that the above
michael@0:  * copyright notice and this permission notice appear in all copies.
michael@0:  *
michael@0:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
michael@0:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
michael@0:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
michael@0:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
michael@0:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
michael@0:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
michael@0:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * This version of this file is derived from Android 2.3 "Gingerbread",
michael@0:  * which contains uncredited changes by Android/Google developers.  It has
michael@0:  * been modified in 2011 for use in the Android build of Mozilla Firefox by
michael@0:  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
michael@0:  * and Steve Workman <sjhworkman@gmail.com>).
michael@0:  * These changes are offered under the same license as the original NetBSD
michael@0:  * file, whose copyright and license are unchanged above.
michael@0:  */
michael@0: 
michael@0: #define ANDROID_CHANGES 1
michael@0: #define MOZILLA_NECKO_EXCLUDE_CODE 1
michael@0: 
michael@0: #include <sys/cdefs.h>
michael@0: #if defined(LIBC_SCCS) && !defined(lint)
michael@0: #ifdef notdef
michael@0: static const char sccsid[] = "@(#)res_mkquery.c	8.1 (Berkeley) 6/4/93";
michael@0: static const char rcsid[] = "Id: res_mkquery.c,v 1.1.2.2.4.2 2004/03/16 12:34:18 marka Exp";
michael@0: #else
michael@0: __RCSID("$NetBSD: res_mkquery.c,v 1.6 2006/01/24 17:40:32 christos Exp $");
michael@0: #endif
michael@0: #endif /* LIBC_SCCS and not lint */
michael@0: 
michael@0: 
michael@0: 
michael@0: #include <sys/types.h>
michael@0: #include <sys/param.h>
michael@0: #include <netinet/in.h>
michael@0: #include "arpa_nameser.h"
michael@0: #include <netdb.h>
michael@0: #ifdef ANDROID_CHANGES
michael@0: #include "resolv_private.h"
michael@0: #else
michael@0: #include <resolv.h>
michael@0: #endif
michael@0: #include <stdio.h>
michael@0: #include <string.h>
michael@0: 
michael@0: /* Options.  Leave them on. */
michael@0: #ifndef DEBUG
michael@0: #define DEBUG
michael@0: #endif
michael@0: 
michael@0: #ifndef lint
michael@0: #define UNUSED(a)	(void)&a
michael@0: #else
michael@0: #define UNUSED(a)	a = a
michael@0: #endif
michael@0: 
michael@0: extern const char *_res_opcodes[];
michael@0: 
michael@0: /*
michael@0:  * Form all types of queries.
michael@0:  * Returns the size of the result or -1.
michael@0:  */
michael@0: int
michael@0: res_nmkquery(res_state statp,
michael@0: 	     int op,			/* opcode of query */
michael@0: 	     const char *dname,		/* domain name */
michael@0: 	     int class, int type,	/* class and type of query */
michael@0: 	     const u_char *data,	/* resource record data */
michael@0: 	     int datalen,		/* length of data */
michael@0: 	     const u_char *newrr_in,	/* new rr for modify or append */
michael@0: 	     u_char *buf,		/* buffer to put query */
michael@0: 	     int buflen)		/* size of buffer */
michael@0: {
michael@0: 	register HEADER *hp;
michael@0: 	register u_char *cp, *ep;
michael@0: 	register int n;
michael@0: 	u_char *dnptrs[20], **dpp, **lastdnptr;
michael@0: 
michael@0: 	UNUSED(newrr_in);
michael@0: 
michael@0: #ifdef DEBUG
michael@0: 	if (statp->options & RES_DEBUG)
michael@0: 		printf(";; res_nmkquery(%s, %s, %s, %s)\n",
michael@0: 		       _res_opcodes[op], dname, p_class(class), p_type(type));
michael@0: #endif
michael@0: 	/*
michael@0: 	 * Initialize header fields.
michael@0: 	 */
michael@0: 	if ((buf == NULL) || (buflen < HFIXEDSZ))
michael@0: 		return (-1);
michael@0: 	memset(buf, 0, HFIXEDSZ);
michael@0: 	hp = (HEADER *)(void *)buf;
michael@0: 	hp->id = htons(res_randomid());
michael@0: 	hp->opcode = op;
michael@0: 	hp->rd = (statp->options & RES_RECURSE) != 0U;
michael@0: 	hp->rcode = NOERROR;
michael@0: 	cp = buf + HFIXEDSZ;
michael@0: 	ep = buf + buflen;
michael@0: 	dpp = dnptrs;
michael@0: 	*dpp++ = buf;
michael@0: 	*dpp++ = NULL;
michael@0: 	lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
michael@0: 	/*
michael@0: 	 * perform opcode specific processing
michael@0: 	 */
michael@0: 	switch (op) {
michael@0: 	case QUERY:	/*FALLTHROUGH*/
michael@0: 	case NS_NOTIFY_OP:
michael@0: 		if (ep - cp < QFIXEDSZ)
michael@0: 			return (-1);
michael@0: 		if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
michael@0: 		    lastdnptr)) < 0)
michael@0: 			return (-1);
michael@0: 		cp += n;
michael@0: 		ns_put16(type, cp);
michael@0: 		cp += INT16SZ;
michael@0: 		ns_put16(class, cp);
michael@0: 		cp += INT16SZ;
michael@0: 		hp->qdcount = htons(1);
michael@0: 		if (op == QUERY || data == NULL)
michael@0: 			break;
michael@0: 		/*
michael@0: 		 * Make an additional record for completion domain.
michael@0: 		 */
michael@0: 		if ((ep - cp) < RRFIXEDSZ)
michael@0: 			return (-1);
michael@0: 		n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
michael@0: 			    dnptrs, lastdnptr);
michael@0: 		if (n < 0)
michael@0: 			return (-1);
michael@0: 		cp += n;
michael@0: 		ns_put16(T_NULL, cp);
michael@0: 		cp += INT16SZ;
michael@0: 		ns_put16(class, cp);
michael@0: 		cp += INT16SZ;
michael@0: 		ns_put32(0, cp);
michael@0: 		cp += INT32SZ;
michael@0: 		ns_put16(0, cp);
michael@0: 		cp += INT16SZ;
michael@0: 		hp->arcount = htons(1);
michael@0: 		break;
michael@0: 
michael@0: 	case IQUERY:
michael@0: 		/*
michael@0: 		 * Initialize answer section
michael@0: 		 */
michael@0: 		if (ep - cp < 1 + RRFIXEDSZ + datalen)
michael@0: 			return (-1);
michael@0: 		*cp++ = '\0';	/* no domain name */
michael@0: 		ns_put16(type, cp);
michael@0: 		cp += INT16SZ;
michael@0: 		ns_put16(class, cp);
michael@0: 		cp += INT16SZ;
michael@0: 		ns_put32(0, cp);
michael@0: 		cp += INT32SZ;
michael@0: 		ns_put16(datalen, cp);
michael@0: 		cp += INT16SZ;
michael@0: 		if (datalen) {
michael@0: 			memcpy(cp, data, (size_t)datalen);
michael@0: 			cp += datalen;
michael@0: 		}
michael@0: 		hp->ancount = htons(1);
michael@0: 		break;
michael@0: 
michael@0: 	default:
michael@0: 		return (-1);
michael@0: 	}
michael@0: 	return (cp - buf);
michael@0: }
michael@0: 
michael@0: #ifdef RES_USE_EDNS0
michael@0: /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
michael@0: #ifndef T_OPT
michael@0: #define T_OPT	41
michael@0: #endif
michael@0: 
michael@0: int
michael@0: res_nopt(res_state statp,
michael@0: 	 int n0,		/* current offset in buffer */
michael@0: 	 u_char *buf,		/* buffer to put query */
michael@0: 	 int buflen,		/* size of buffer */
michael@0: 	 int anslen)		/* UDP answer buffer size */
michael@0: {
michael@0: 	register HEADER *hp;
michael@0: 	register u_char *cp, *ep;
michael@0: 	u_int16_t flags = 0;
michael@0: 
michael@0: #ifdef DEBUG
michael@0: 	if ((statp->options & RES_DEBUG) != 0U)
michael@0: 		printf(";; res_nopt()\n");
michael@0: #endif
michael@0: 
michael@0: 	hp = (HEADER *)(void *)buf;
michael@0: 	cp = buf + n0;
michael@0: 	ep = buf + buflen;
michael@0: 
michael@0: 	if ((ep - cp) < 1 + RRFIXEDSZ)
michael@0: 		return (-1);
michael@0: 
michael@0: 	*cp++ = 0;	/* "." */
michael@0: 
michael@0: 	ns_put16(T_OPT, cp);	/* TYPE */
michael@0: 	cp += INT16SZ;
michael@0: 	ns_put16(anslen & 0xffff, cp);	/* CLASS = UDP payload size */
michael@0: 	cp += INT16SZ;
michael@0: 	*cp++ = NOERROR;	/* extended RCODE */
michael@0: 	*cp++ = 0;		/* EDNS version */
michael@0: 	if (statp->options & RES_USE_DNSSEC) {
michael@0: #ifdef DEBUG
michael@0: 		if (statp->options & RES_DEBUG)
michael@0: 			printf(";; res_opt()... ENDS0 DNSSEC\n");
michael@0: #endif
michael@0: 		flags |= NS_OPT_DNSSEC_OK;
michael@0: 	}
michael@0: 	ns_put16(flags, cp);
michael@0: 	cp += INT16SZ;
michael@0: 	ns_put16(0, cp);	/* RDLEN */
michael@0: 	cp += INT16SZ;
michael@0: 	hp->arcount = htons(ntohs(hp->arcount) + 1);
michael@0: 
michael@0: 	return (cp - buf);
michael@0: }
michael@0: #endif