source: rtems-libbsd/freebsd/lib/libc/resolv/res_mkquery.c @ 2404264

/*
 * 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.
 * 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 1.5.18.2 2008/04/03 23:15:15 marka Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "port_before.h"
#include <rtems/bsd/sys/types.h>
#include <rtems/bsd/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 DEBUG

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  */
{
        HEADER *hp;
        u_char *cp, *ep;
        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). */

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 */
{
        HEADER *hp;
        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(ns_t_opt, cp);                 /*%< TYPE */
        cp += INT16SZ;
        if (anslen > 0xffff)
                anslen = 0xffff;                /* limit to 16bit value */
        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(0U, cp);                       /*%< RDLEN */
        cp += INT16SZ;

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

        return (cp - buf);
}

/*
 * Construct variable data (RDATA) block for OPT psuedo-RR, append it
 * to the buffer, then update the RDLEN field (previously set to zero by
 * res_nopt()) with the new RDATA length.
 */
int
res_nopt_rdata(res_state statp,
          int n0,               /*%< current offset in buffer */
          u_char *buf,          /*%< buffer to put query */
          int buflen,           /*%< size of buffer */
          u_char *rdata,        /*%< ptr to start of opt rdata */
          u_short code,         /*%< OPTION-CODE */
          u_short len,          /*%< OPTION-LENGTH */
          u_char *data)         /*%< OPTION_DATA */
{
        register u_char *cp, *ep;

#ifdef DEBUG
        if ((statp->options & RES_DEBUG) != 0U)
                printf(";; res_nopt_rdata()\n");
#endif

        cp = buf + n0;
        ep = buf + buflen;

        if ((ep - cp) < (4 + len))
                return (-1);

        if (rdata < (buf + 2) || rdata >= ep)
                return (-1);

        ns_put16(code, cp);
        cp += INT16SZ;

        ns_put16(len, cp);
        cp += INT16SZ;

        memcpy(cp, data, len);
        cp += len;

        len = cp - rdata;
        ns_put16(len, rdata - 2);       /* Update RDLEN field */

        return (cp - buf);
}
#endif

/*! \file */