/* * 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. */#if defined(LIBC_SCCS) && !defined(lint)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 $";#endif /* LIBC_SCCS and not lint */#include "port_before.h"#include <sys/types.h>#include <sys/param.h>#include <netinet/in.h>#include <arpa/nameser.h>#include <netdb.h>#include <resolv.h>#include <stdio.h>#include <string.h>#include "port_after.h"/* Options.  Leave them on. */#define DEBUGextern const char *_res_opcodes[];/* * Form all types of queries. * Returns the size of the result or -1. */intres_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 *) buf;	hp->id = htons(++statp->id);	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, 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#endifintres_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 *) 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