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Annotation of src/lib/libc/resolv/res_mkquery.c, Revision 1.8

1.8     ! ghen        1: /*     $NetBSD: res_mkquery.c,v 1.1.1.3 2007/03/30 20:16:22 ghen Exp $ */
1.1       christos    2:
                      3: /*
                      4:  * Copyright (c) 1985, 1993
                      5:  *    The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: /*
                     37:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
                     38:  *
                     39:  * Permission to use, copy, modify, and distribute this software for any
                     40:  * purpose with or without fee is hereby granted, provided that the above
                     41:  * copyright notice and this permission notice appear in all copies, and that
                     42:  * the name of Digital Equipment Corporation not be used in advertising or
                     43:  * publicity pertaining to distribution of the document or software without
                     44:  * specific, written prior permission.
                     45:  *
                     46:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
                     47:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
                     48:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
                     49:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
                     50:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
                     51:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
                     52:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
                     53:  * SOFTWARE.
                     54:  */
                     55:
                     56: /*
                     57:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
                     58:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
                     59:  *
                     60:  * Permission to use, copy, modify, and distribute this software for any
                     61:  * purpose with or without fee is hereby granted, provided that the above
                     62:  * copyright notice and this permission notice appear in all copies.
                     63:  *
                     64:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
                     65:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     66:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
                     67:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     68:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     69:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
                     70:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     71:  */
                     72:
1.3       christos   73: #include <sys/cdefs.h>
1.1       christos   74: #if defined(LIBC_SCCS) && !defined(lint)
1.3       christos   75: #ifdef notdef
1.1       christos   76: static const char sccsid[] = "@(#)res_mkquery.c        8.1 (Berkeley) 6/4/93";
1.7       christos   77: static const char rcsid[] = "Id: res_mkquery.c,v 1.5.18.1 2005/04/27 05:01:11 sra Exp";
1.3       christos   78: #else
1.8     ! ghen       79: __RCSID("$NetBSD: res_mkquery.c,v 1.7 2007/01/27 22:26:44 christos Exp $");
1.3       christos   80: #endif
1.1       christos   81: #endif /* LIBC_SCCS and not lint */
                     82:
                     83: #include "port_before.h"
1.4       christos   84:
                     85: #include "namespace.h"
1.1       christos   86: #include <sys/types.h>
                     87: #include <sys/param.h>
                     88: #include <netinet/in.h>
                     89: #include <arpa/nameser.h>
                     90: #include <netdb.h>
                     91: #include <resolv.h>
                     92: #include <stdio.h>
                     93: #include <string.h>
                     94: #include "port_after.h"
                     95:
1.5       christos   96: #if 0
1.4       christos   97: #ifdef __weak_alias
                     98: __weak_alias(res_nmkquery,_res_nmkquery)
                     99: __weak_alias(res_nopt,_res_nopt)
                    100: #endif
1.5       christos  101: #endif
1.4       christos  102:
1.1       christos  103: /* Options.  Leave them on. */
1.6       christos  104: #ifndef DEBUG
1.1       christos  105: #define DEBUG
1.6       christos  106: #endif
1.1       christos  107:
                    108: extern const char *_res_opcodes[];
                    109:
1.7       christos  110: /*%
1.1       christos  111:  * Form all types of queries.
                    112:  * Returns the size of the result or -1.
                    113:  */
                    114: int
                    115: res_nmkquery(res_state statp,
1.7       christos  116:             int op,                    /*!< opcode of query  */
                    117:             const char *dname,         /*!< domain name  */
                    118:             int class, int type,       /*!< class and type of query  */
                    119:             const u_char *data,        /*!< resource record data  */
                    120:             int datalen,               /*!< length of data  */
                    121:             const u_char *newrr_in,    /*!< new rr for modify or append  */
                    122:             u_char *buf,               /*!< buffer to put query  */
                    123:             int buflen)                /*!< size of buffer  */
1.1       christos  124: {
                    125:        register HEADER *hp;
                    126:        register u_char *cp, *ep;
                    127:        register int n;
                    128:        u_char *dnptrs[20], **dpp, **lastdnptr;
                    129:
                    130:        UNUSED(newrr_in);
                    131:
                    132: #ifdef DEBUG
                    133:        if (statp->options & RES_DEBUG)
                    134:                printf(";; res_nmkquery(%s, %s, %s, %s)\n",
                    135:                       _res_opcodes[op], dname, p_class(class), p_type(type));
                    136: #endif
                    137:        /*
                    138:         * Initialize header fields.
                    139:         */
                    140:        if ((buf == NULL) || (buflen < HFIXEDSZ))
                    141:                return (-1);
                    142:        memset(buf, 0, HFIXEDSZ);
1.2       christos  143:        hp = (HEADER *)(void *)buf;
1.1       christos  144:        hp->id = htons(++statp->id);
                    145:        hp->opcode = op;
                    146:        hp->rd = (statp->options & RES_RECURSE) != 0U;
                    147:        hp->rcode = NOERROR;
                    148:        cp = buf + HFIXEDSZ;
                    149:        ep = buf + buflen;
                    150:        dpp = dnptrs;
                    151:        *dpp++ = buf;
                    152:        *dpp++ = NULL;
                    153:        lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
                    154:        /*
                    155:         * perform opcode specific processing
                    156:         */
                    157:        switch (op) {
                    158:        case QUERY:     /*FALLTHROUGH*/
                    159:        case NS_NOTIFY_OP:
                    160:                if (ep - cp < QFIXEDSZ)
                    161:                        return (-1);
                    162:                if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
                    163:                    lastdnptr)) < 0)
                    164:                        return (-1);
                    165:                cp += n;
                    166:                ns_put16(type, cp);
                    167:                cp += INT16SZ;
                    168:                ns_put16(class, cp);
                    169:                cp += INT16SZ;
                    170:                hp->qdcount = htons(1);
                    171:                if (op == QUERY || data == NULL)
                    172:                        break;
                    173:                /*
                    174:                 * Make an additional record for completion domain.
                    175:                 */
                    176:                if ((ep - cp) < RRFIXEDSZ)
                    177:                        return (-1);
                    178:                n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
                    179:                            dnptrs, lastdnptr);
                    180:                if (n < 0)
                    181:                        return (-1);
                    182:                cp += n;
                    183:                ns_put16(T_NULL, cp);
                    184:                cp += INT16SZ;
                    185:                ns_put16(class, cp);
                    186:                cp += INT16SZ;
                    187:                ns_put32(0, cp);
                    188:                cp += INT32SZ;
                    189:                ns_put16(0, cp);
                    190:                cp += INT16SZ;
                    191:                hp->arcount = htons(1);
                    192:                break;
                    193:
                    194:        case IQUERY:
                    195:                /*
                    196:                 * Initialize answer section
                    197:                 */
                    198:                if (ep - cp < 1 + RRFIXEDSZ + datalen)
                    199:                        return (-1);
1.7       christos  200:                *cp++ = '\0';   /*%< no domain name */
1.1       christos  201:                ns_put16(type, cp);
                    202:                cp += INT16SZ;
                    203:                ns_put16(class, cp);
                    204:                cp += INT16SZ;
                    205:                ns_put32(0, cp);
                    206:                cp += INT32SZ;
                    207:                ns_put16(datalen, cp);
                    208:                cp += INT16SZ;
                    209:                if (datalen) {
1.2       christos  210:                        memcpy(cp, data, (size_t)datalen);
1.1       christos  211:                        cp += datalen;
                    212:                }
                    213:                hp->ancount = htons(1);
                    214:                break;
                    215:
                    216:        default:
                    217:                return (-1);
                    218:        }
                    219:        return (cp - buf);
                    220: }
                    221:
                    222: #ifdef RES_USE_EDNS0
                    223: /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
                    224: #ifndef T_OPT
                    225: #define T_OPT  41
                    226: #endif
                    227:
                    228: int
                    229: res_nopt(res_state statp,
1.7       christos  230:         int n0,                /*%< current offset in buffer */
                    231:         u_char *buf,           /*%< buffer to put query */
                    232:         int buflen,            /*%< size of buffer */
                    233:         int anslen)            /*%< UDP answer buffer size */
1.1       christos  234: {
                    235:        register HEADER *hp;
                    236:        register u_char *cp, *ep;
                    237:        u_int16_t flags = 0;
                    238:
                    239: #ifdef DEBUG
                    240:        if ((statp->options & RES_DEBUG) != 0U)
                    241:                printf(";; res_nopt()\n");
                    242: #endif
                    243:
1.2       christos  244:        hp = (HEADER *)(void *)buf;
1.1       christos  245:        cp = buf + n0;
                    246:        ep = buf + buflen;
                    247:
                    248:        if ((ep - cp) < 1 + RRFIXEDSZ)
                    249:                return (-1);
                    250:
1.7       christos  251:        *cp++ = 0;      /*%< "." */
                    252:        ns_put16(T_OPT, cp);    /*%< TYPE */
1.1       christos  253:        cp += INT16SZ;
1.7       christos  254:        ns_put16(anslen & 0xffff, cp);  /*%< CLASS = UDP payload size */
1.1       christos  255:        cp += INT16SZ;
1.7       christos  256:        *cp++ = NOERROR;        /*%< extended RCODE */
                    257:        *cp++ = 0;              /*%< EDNS version */
1.1       christos  258:        if (statp->options & RES_USE_DNSSEC) {
                    259: #ifdef DEBUG
                    260:                if (statp->options & RES_DEBUG)
                    261:                        printf(";; res_opt()... ENDS0 DNSSEC\n");
                    262: #endif
                    263:                flags |= NS_OPT_DNSSEC_OK;
                    264:        }
                    265:        ns_put16(flags, cp);
                    266:        cp += INT16SZ;
1.7       christos  267:        ns_put16(0, cp);        /*%< RDLEN */
1.1       christos  268:        cp += INT16SZ;
                    269:        hp->arcount = htons(ntohs(hp->arcount) + 1);
                    270:
                    271:        return (cp - buf);
                    272: }
                    273: #endif
1.7       christos  274:
                    275: /*! \file */

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