contrib/dhcp-3.0/minires/res_mkquery.c

   1 /*
   2  * Copyright (c) 1985, 1993
   3  *    The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  36  *
  37  * Permission to use, copy, modify, and distribute this software for any
  38  * purpose with or without fee is hereby granted, provided that the above
  39  * copyright notice and this permission notice appear in all copies, and that
  40  * the name of Digital Equipment Corporation not be used in advertising or
  41  * publicity pertaining to distribution of the document or software without
  42  * specific, written prior permission.
  43  *
  44  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  45  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  46  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  47  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  48  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  49  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  50  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  51  * SOFTWARE.
  52  */
  53
  54 /*
  55  * Portions Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  56  * Portions Copyright (c) 1996-2003 by Internet Software Consortium
  57  *
  58  * Permission to use, copy, modify, and distribute this software for any
  59  * purpose with or without fee is hereby granted, provided that the above
  60  * copyright notice and this permission notice appear in all copies.
  61  *
  62  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  63  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  64  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  65  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  66  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  67  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  68  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  69  *
  70  *   Internet Systems Consortium, Inc.
  71  *   950 Charter Street
  72  *   Redwood City, CA 94063
  73  *   <info@isc.org>
  74  *   http://www.isc.org/
  75  */
  76
  77 #if defined(LIBC_SCCS) && !defined(lint)
  78 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
  79 static const char rcsid[] = "$Id: res_mkquery.c,v 1.4.2.1 2004/06/10 17:59:43 dhankins Exp $";
  80 #endif /* LIBC_SCCS and not lint */
  81
  82 #include <sys/types.h>
  83 #include <sys/param.h>
  84 #include <netinet/in.h>
  85 #include <netdb.h>
  86 #include <stdio.h>
  87 #include <string.h>
  88 #include <sys/socket.h>
  89
  90 #include "minires/minires.h"
  91 #include "arpa/nameser.h"
  92
  93 extern const char *_res_opcodes[];
  94
  95 /*
  96  * Form all types of queries.
  97  * Returns the size of the result or -1.
  98  */
  99 isc_result_t
 100 res_nmkquery(res_state statp,
 101              int op,                    /* opcode of query */
 102              const char *dname,         /* domain name */
 103              ns_class class, ns_type type,      /* class and type of query */
 104              const u_char *data,        /* resource record data */
 105              unsigned datalen,          /* length of data */
 106              const u_char *newrr_in,    /* new rr for modify or append */
 107              double *buf,               /* buffer to put query */
 108              unsigned buflen,           /* size of buffer */
 109              unsigned *rbuflen)         /* returned size of buffer */
 110 {
 111         register HEADER *hp;
 112         register u_char *cp;
 113         register int n;
 114         u_char *dnptrs[20], **dpp, **lastdnptr;
 115
 116         /*
 117          * Initialize header fields.
 118          */
 119         if ((buf == NULL) || (buflen < HFIXEDSZ))
 120                 return ISC_R_INVALIDARG;
 121         memset(buf, 0, HFIXEDSZ);
 122         hp = (HEADER *) buf;
 123         hp->id = htons(++statp->id);
 124         hp->opcode = op;
 125         hp->rd = (statp->options & RES_RECURSE) != 0;
 126         hp->rcode = NOERROR;
 127         cp = ((u_char *)buf) + HFIXEDSZ;
 128         buflen -= HFIXEDSZ;
 129         dpp = dnptrs;
 130         *dpp++ = (u_char *)buf;
 131         *dpp++ = NULL;
 132         lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 133         /*
 134          * perform opcode specific processing
 135          */
 136         switch (op) {
 137         case QUERY:     /*FALLTHROUGH*/
 138         case NS_NOTIFY_OP:
 139                 if ((buflen -= QFIXEDSZ) < 0)
 140                         return ISC_R_NOSPACE;
 141                 if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
 142                         return ISC_R_NOSPACE;
 143                 cp += n;
 144                 buflen -= n;
 145                 putUShort(cp, type);
 146                 cp += INT16SZ;
 147                 putUShort(cp, class);
 148                 cp += INT16SZ;
 149                 hp->qdcount = htons(1);
 150                 if (op == QUERY || data == NULL)
 151                         break;
 152                 /*
 153                  * Make an additional record for completion domain.
 154                  */
 155                 buflen -= RRFIXEDSZ;
 156                 n = dn_comp((const char *)data, cp, buflen, dnptrs, lastdnptr);
 157                 if (n < 0)
 158                         return ISC_R_NOSPACE;
 159                 cp += n;
 160                 buflen -= n;
 161                 putUShort(cp, T_NULL);
 162                 cp += INT16SZ;
 163                 putUShort(cp, class);
 164                 cp += INT16SZ;
 165                 putULong(cp, 0);
 166                 cp += INT32SZ;
 167                 putUShort(cp, 0);
 168                 cp += INT16SZ;
 169                 hp->arcount = htons(1);
 170                 break;
 171
 172         case IQUERY:
 173                 /*
 174                  * Initialize answer section
 175                  */
 176                 if (buflen < 1 + RRFIXEDSZ + datalen)
 177                         return ISC_R_NOSPACE;
 178                 *cp++ = '\0';   /* no domain name */
 179                 putUShort(cp, type);
 180                 cp += INT16SZ;
 181                 putUShort(cp, class);
 182                 cp += INT16SZ;
 183                 putULong(cp, 0);
 184                 cp += INT32SZ;
 185                 putUShort(cp, datalen);
 186                 cp += INT16SZ;
 187                 if (datalen) {
 188                         memcpy(cp, data, datalen);
 189                         cp += datalen;
 190                 }
 191                 hp->ancount = htons(1);
 192                 break;
 193
 194         default:
 195                 return ISC_R_NOTIMPLEMENTED;
 196         }
 197         *rbuflen = cp - ((u_char *)buf);
 198         return ISC_R_SUCCESS;
 199 }