external/bsd/libbind/dist/resolv/res_mkquery.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Portions Copyright (C) 2004, 2005, 2008  Internet Systems Consortium, Inc. ("ISC")
   5  * Portions Copyright (C) 1996, 1997, 1988, 1999, 2001, 2003  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /*
  21  * Copyright (c) 1985, 1993
  22  *    The Regents of the University of California.  All rights reserved.
  23  *
  24  * Redistribution and use in source and binary forms, with or without
  25  * modification, are permitted provided that the following conditions
  26  * are met:
  27  * 1. Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  * 2. Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in the
  31  *    documentation and/or other materials provided with the distribution.
  32  * 3. All advertising materials mentioning features or use of this software
  33  *    must display the following acknowledgement:
  34  *      This product includes software developed by the University of
  35  *      California, Berkeley and its contributors.
  36  * 4. Neither the name of the University nor the names of its contributors
  37  *    may be used to endorse or promote products derived from this software
  38  *    without specific prior written permission.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  */
  52
  53 /*
  54  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  55  *
  56  * Permission to use, copy, modify, and distribute this software for any
  57  * purpose with or without fee is hereby granted, provided that the above
  58  * copyright notice and this permission notice appear in all copies, and that
  59  * the name of Digital Equipment Corporation not be used in advertising or
  60  * publicity pertaining to distribution of the document or software without
  61  * specific, written prior permission.
  62  *
  63  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  64  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  65  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  66  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  67  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  68  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  69  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  70  * SOFTWARE.
  71  */
  72
  73 #if defined(LIBC_SCCS) && !defined(lint)
  74 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
  75 static const char rcsid[] = "Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp";
  76 #endif /* LIBC_SCCS and not lint */
  77
  78 #include "port_before.h"
  79 #include <sys/types.h>
  80 #include <sys/param.h>
  81 #include <netinet/in.h>
  82 #include <arpa/nameser.h>
  83 #include <netdb.h>
  84 #include <resolv.h>
  85 #include <stdio.h>
  86 #include <string.h>
  87 #include "port_after.h"
  88
  89 /* Options.  Leave them on. */
  90 #define DEBUG
  91
  92 extern const char *_res_opcodes[];
  93
  94 /*%
  95  * Form all types of queries.
  96  * Returns the size of the result or -1.
  97  */
  98 int
  99 res_nmkquery(res_state statp,
 100              int op,                    /*!< opcode of query  */
 101              const char *dname,         /*!< domain name  */
 102              int class, int type,       /*!< class and type of query  */
 103              const u_char *data,        /*!< resource record data  */
 104              int datalen,               /*!< length of data  */
 105              const u_char *newrr_in,    /*!< new rr for modify or append  */
 106              u_char *buf,               /*!< buffer to put query  */
 107              int buflen)                /*!< size of buffer  */
 108 {
 109         register HEADER *hp;
 110         register u_char *cp, *ep;
 111         register int n;
 112         u_char *dnptrs[20], **dpp, **lastdnptr;
 113
 114         UNUSED(newrr_in);
 115
 116 #ifdef DEBUG
 117         if (statp->options & RES_DEBUG)
 118                 printf(";; res_nmkquery(%s, %s, %s, %s)\n",
 119                        _res_opcodes[op], dname, p_class(class), p_type(type));
 120 #endif
 121         /*
 122          * Initialize header fields.
 123          */
 124         if ((buf == NULL) || (buflen < HFIXEDSZ))
 125                 return (-1);
 126         memset(buf, 0, HFIXEDSZ);
 127         hp = (HEADER *) buf;
 128         statp->id = res_nrandomid(statp);
 129         hp->id = htons(statp->id);
 130         hp->opcode = op;
 131         hp->rd = (statp->options & RES_RECURSE) != 0U;
 132         hp->rcode = NOERROR;
 133         cp = buf + HFIXEDSZ;
 134         ep = buf + buflen;
 135         dpp = dnptrs;
 136         *dpp++ = buf;
 137         *dpp++ = NULL;
 138         lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 139         /*
 140          * perform opcode specific processing
 141          */
 142         switch (op) {
 143         case QUERY:     /*FALLTHROUGH*/
 144         case NS_NOTIFY_OP:
 145                 if (ep - cp < QFIXEDSZ)
 146                         return (-1);
 147                 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
 148                     lastdnptr)) < 0)
 149                         return (-1);
 150                 cp += n;
 151                 ns_put16(type, cp);
 152                 cp += INT16SZ;
 153                 ns_put16(class, cp);
 154                 cp += INT16SZ;
 155                 hp->qdcount = htons(1);
 156                 if (op == QUERY || data == NULL)
 157                         break;
 158                 /*
 159                  * Make an additional record for completion domain.
 160                  */
 161                 if ((ep - cp) < RRFIXEDSZ)
 162                         return (-1);
 163                 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
 164                             dnptrs, lastdnptr);
 165                 if (n < 0)
 166                         return (-1);
 167                 cp += n;
 168                 ns_put16(T_NULL, cp);
 169                 cp += INT16SZ;
 170                 ns_put16(class, cp);
 171                 cp += INT16SZ;
 172                 ns_put32(0, cp);
 173                 cp += INT32SZ;
 174                 ns_put16(0, cp);
 175                 cp += INT16SZ;
 176                 hp->arcount = htons(1);
 177                 break;
 178
 179         case IQUERY:
 180                 /*
 181                  * Initialize answer section
 182                  */
 183                 if (ep - cp < 1 + RRFIXEDSZ + datalen)
 184                         return (-1);
 185                 *cp++ = '\0';   /*%< no domain name */
 186                 ns_put16(type, cp);
 187                 cp += INT16SZ;
 188                 ns_put16(class, cp);
 189                 cp += INT16SZ;
 190                 ns_put32(0, cp);
 191                 cp += INT32SZ;
 192                 ns_put16(datalen, cp);
 193                 cp += INT16SZ;
 194                 if (datalen) {
 195                         memcpy(cp, data, datalen);
 196                         cp += datalen;
 197                 }
 198                 hp->ancount = htons(1);
 199                 break;
 200
 201         default:
 202                 return (-1);
 203         }
 204         return (cp - buf);
 205 }
 206
 207 #ifdef RES_USE_EDNS0
 208 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
 209
 210 int
 211 res_nopt(res_state statp,
 212          int n0,                /*%< current offset in buffer */
 213          u_char *buf,           /*%< buffer to put query */
 214          int buflen,            /*%< size of buffer */
 215          int anslen)            /*%< UDP answer buffer size */
 216 {
 217         register HEADER *hp;
 218         register u_char *cp, *ep;
 219         u_int16_t flags = 0;
 220
 221 #ifdef DEBUG
 222         if ((statp->options & RES_DEBUG) != 0U)
 223                 printf(";; res_nopt()\n");
 224 #endif
 225
 226         hp = (HEADER *) buf;
 227         cp = buf + n0;
 228         ep = buf + buflen;
 229
 230         if ((ep - cp) < 1 + RRFIXEDSZ)
 231                 return (-1);
 232
 233         *cp++ = 0;                              /*%< "." */
 234         ns_put16(ns_t_opt, cp);                 /*%< TYPE */
 235         cp += INT16SZ;
 236         ns_put16(anslen & 0xffff, cp);          /*%< CLASS = UDP payload size */
 237         cp += INT16SZ;
 238         *cp++ = NOERROR;                        /*%< extended RCODE */
 239         *cp++ = 0;                              /*%< EDNS version */
 240
 241         if (statp->options & RES_USE_DNSSEC) {
 242 #ifdef DEBUG
 243                 if (statp->options & RES_DEBUG)
 244                         printf(";; res_opt()... ENDS0 DNSSEC\n");
 245 #endif
 246                 flags |= NS_OPT_DNSSEC_OK;
 247         }
 248         ns_put16(flags, cp);
 249         cp += INT16SZ;
 250
 251         ns_put16(0U, cp);                       /*%< RDLEN */
 252         cp += INT16SZ;
 253
 254         hp->arcount = htons(ntohs(hp->arcount) + 1);
 255
 256         return (cp - buf);
 257 }
 258
 259 /*
 260  * Construct variable data (RDATA) block for OPT psuedo-RR, append it
 261  * to the buffer, then update the RDLEN field (previously set to zero by
 262  * res_nopt()) with the new RDATA length.
 263  */
 264 int
 265 res_nopt_rdata(res_state statp,
 266           int n0,               /*%< current offset in buffer */
 267           u_char *buf,          /*%< buffer to put query */
 268           int buflen,           /*%< size of buffer */
 269           u_char *rdata,        /*%< ptr to start of opt rdata */
 270           u_short code,         /*%< OPTION-CODE */
 271           u_short len,          /*%< OPTION-LENGTH */
 272           u_char *data)         /*%< OPTION_DATA */
 273 {
 274         register u_char *cp, *ep;
 275
 276 #ifdef DEBUG
 277         if ((statp->options & RES_DEBUG) != 0U)
 278                 printf(";; res_nopt_rdata()\n");
 279 #endif
 280
 281         cp = buf + n0;
 282         ep = buf + buflen;
 283
 284         if ((ep - cp) < (4 + len))
 285                 return (-1);
 286
 287         if (rdata < (buf + 2) || rdata >= ep)
 288                 return (-1);
 289
 290         ns_put16(code, cp);
 291         cp += INT16SZ;
 292
 293         ns_put16(len, cp);
 294         cp += INT16SZ;
 295
 296         memcpy(cp, data, len);
 297         cp += len;
 298
 299         len = cp - rdata;
 300         ns_put16(len, rdata - 2);       /* Update RDLEN field */
 301
 302         return (cp - buf);
 303 }
 304 #endif
 305
 306 /*! \file */