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Annotation of src/lib/libc/resolv/res_mkquery.c, Revision 1.13

1.13    ! christos    1: /*     $NetBSD: res_mkquery.c,v 1.12 2009/04/12 19:43:37 christos Exp $        */
1.11      christos    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:  */
1.1       christos   19:
                     20: /*
                     21:  * Copyright (c) 1985, 1993
                     22:  *    The Regents of the University of California.  All rights reserved.
1.11      christos   23:  *
1.1       christos   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.
1.11      christos   39:  *
1.1       christos   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.
1.11      christos   55:  *
1.1       christos   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.
1.11      christos   62:  *
1.1       christos   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:
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";
1.11      christos   77: static const char rcsid[] = "Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp";
1.3       christos   78: #else
1.13    ! christos   79: __RCSID("$NetBSD: res_mkquery.c,v 1.12 2009/04/12 19:43:37 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>
1.13    ! christos   90: #include <assert.h>
1.1       christos   91: #include <netdb.h>
                     92: #include <resolv.h>
                     93: #include <stdio.h>
                     94: #include <string.h>
                     95: #include "port_after.h"
                     96:
1.5       christos   97: #if 0
1.4       christos   98: #ifdef __weak_alias
                     99: __weak_alias(res_nmkquery,_res_nmkquery)
                    100: __weak_alias(res_nopt,_res_nopt)
                    101: #endif
1.5       christos  102: #endif
1.4       christos  103:
1.1       christos  104: /* Options.  Leave them on. */
1.10      christos  105: #ifndef DEBUG
1.1       christos  106: #define DEBUG
1.10      christos  107: #endif
1.1       christos  108:
                    109: extern const char *_res_opcodes[];
                    110:
1.7       christos  111: /*%
1.1       christos  112:  * Form all types of queries.
                    113:  * Returns the size of the result or -1.
                    114:  */
                    115: int
                    116: res_nmkquery(res_state statp,
1.7       christos  117:             int op,                    /*!< opcode of query  */
                    118:             const char *dname,         /*!< domain name  */
                    119:             int class, int type,       /*!< class and type of query  */
                    120:             const u_char *data,        /*!< resource record data  */
                    121:             int datalen,               /*!< length of data  */
                    122:             const u_char *newrr_in,    /*!< new rr for modify or append  */
                    123:             u_char *buf,               /*!< buffer to put query  */
                    124:             int buflen)                /*!< size of buffer  */
1.1       christos  125: {
                    126:        register HEADER *hp;
                    127:        register u_char *cp, *ep;
                    128:        register int n;
                    129:        u_char *dnptrs[20], **dpp, **lastdnptr;
                    130:
                    131:        UNUSED(newrr_in);
                    132:
                    133: #ifdef DEBUG
                    134:        if (statp->options & RES_DEBUG)
                    135:                printf(";; res_nmkquery(%s, %s, %s, %s)\n",
                    136:                       _res_opcodes[op], dname, p_class(class), p_type(type));
                    137: #endif
                    138:        /*
                    139:         * Initialize header fields.
                    140:         */
                    141:        if ((buf == NULL) || (buflen < HFIXEDSZ))
                    142:                return (-1);
                    143:        memset(buf, 0, HFIXEDSZ);
1.2       christos  144:        hp = (HEADER *)(void *)buf;
1.11      christos  145:        statp->id = res_nrandomid(statp);
                    146:        hp->id = htons(statp->id);
1.1       christos  147:        hp->opcode = op;
                    148:        hp->rd = (statp->options & RES_RECURSE) != 0U;
                    149:        hp->rcode = NOERROR;
                    150:        cp = buf + HFIXEDSZ;
                    151:        ep = buf + buflen;
                    152:        dpp = dnptrs;
                    153:        *dpp++ = buf;
                    154:        *dpp++ = NULL;
                    155:        lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
                    156:        /*
                    157:         * perform opcode specific processing
                    158:         */
                    159:        switch (op) {
                    160:        case QUERY:     /*FALLTHROUGH*/
                    161:        case NS_NOTIFY_OP:
                    162:                if (ep - cp < QFIXEDSZ)
                    163:                        return (-1);
1.13    ! christos  164:                if ((n = dn_comp(dname, cp, (int)(ep - cp - QFIXEDSZ), dnptrs,
1.1       christos  165:                    lastdnptr)) < 0)
                    166:                        return (-1);
                    167:                cp += n;
                    168:                ns_put16(type, cp);
                    169:                cp += INT16SZ;
                    170:                ns_put16(class, cp);
                    171:                cp += INT16SZ;
                    172:                hp->qdcount = htons(1);
                    173:                if (op == QUERY || data == NULL)
                    174:                        break;
                    175:                /*
                    176:                 * Make an additional record for completion domain.
                    177:                 */
                    178:                if ((ep - cp) < RRFIXEDSZ)
                    179:                        return (-1);
1.13    ! christos  180:                n = dn_comp((const char *)data, cp, (int)(ep - cp - RRFIXEDSZ),
1.1       christos  181:                            dnptrs, lastdnptr);
                    182:                if (n < 0)
                    183:                        return (-1);
                    184:                cp += n;
                    185:                ns_put16(T_NULL, cp);
                    186:                cp += INT16SZ;
                    187:                ns_put16(class, cp);
                    188:                cp += INT16SZ;
                    189:                ns_put32(0, cp);
                    190:                cp += INT32SZ;
                    191:                ns_put16(0, cp);
                    192:                cp += INT16SZ;
                    193:                hp->arcount = htons(1);
                    194:                break;
                    195:
                    196:        case IQUERY:
                    197:                /*
                    198:                 * Initialize answer section
                    199:                 */
                    200:                if (ep - cp < 1 + RRFIXEDSZ + datalen)
                    201:                        return (-1);
1.7       christos  202:                *cp++ = '\0';   /*%< no domain name */
1.1       christos  203:                ns_put16(type, cp);
                    204:                cp += INT16SZ;
                    205:                ns_put16(class, cp);
                    206:                cp += INT16SZ;
                    207:                ns_put32(0, cp);
                    208:                cp += INT32SZ;
                    209:                ns_put16(datalen, cp);
                    210:                cp += INT16SZ;
                    211:                if (datalen) {
1.2       christos  212:                        memcpy(cp, data, (size_t)datalen);
1.1       christos  213:                        cp += datalen;
                    214:                }
                    215:                hp->ancount = htons(1);
                    216:                break;
                    217:
                    218:        default:
                    219:                return (-1);
                    220:        }
1.13    ! christos  221:        _DIAGASSERT(__type_fit(int, cp - buf));
        !           222:        return (int)(cp - buf);
1.1       christos  223: }
                    224:
                    225: #ifdef RES_USE_EDNS0
                    226: /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
                    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:
1.11      christos  251:        *cp++ = 0;                              /*%< "." */
                    252:        ns_put16(ns_t_opt, cp);                 /*%< TYPE */
1.1       christos  253:        cp += INT16SZ;
1.11      christos  254:        ns_put16(anslen & 0xffff, cp);          /*%< CLASS = UDP payload size */
1.1       christos  255:        cp += INT16SZ;
1.11      christos  256:        *cp++ = NOERROR;                        /*%< extended RCODE */
                    257:        *cp++ = 0;                              /*%< EDNS version */
1.9       christos  258:
1.1       christos  259:        if (statp->options & RES_USE_DNSSEC) {
                    260: #ifdef DEBUG
                    261:                if (statp->options & RES_DEBUG)
                    262:                        printf(";; res_opt()... ENDS0 DNSSEC\n");
                    263: #endif
                    264:                flags |= NS_OPT_DNSSEC_OK;
                    265:        }
                    266:        ns_put16(flags, cp);
                    267:        cp += INT16SZ;
1.9       christos  268:
1.11      christos  269:        ns_put16(0U, cp);                       /*%< RDLEN */
1.1       christos  270:        cp += INT16SZ;
1.9       christos  271:
1.1       christos  272:        hp->arcount = htons(ntohs(hp->arcount) + 1);
                    273:
1.13    ! christos  274:        _DIAGASSERT(__type_fit(int, cp - buf));
        !           275:        return (int)(cp - buf);
1.1       christos  276: }
1.9       christos  277:
                    278: /*
                    279:  * Construct variable data (RDATA) block for OPT psuedo-RR, append it
                    280:  * to the buffer, then update the RDLEN field (previously set to zero by
                    281:  * res_nopt()) with the new RDATA length.
                    282:  */
                    283: int
                    284: res_nopt_rdata(res_state statp,
                    285:          int n0,               /*%< current offset in buffer */
                    286:          u_char *buf,          /*%< buffer to put query */
                    287:          int buflen,           /*%< size of buffer */
                    288:          u_char *rdata,        /*%< ptr to start of opt rdata */
                    289:          u_short code,         /*%< OPTION-CODE */
                    290:          u_short len,          /*%< OPTION-LENGTH */
                    291:          u_char *data)         /*%< OPTION_DATA */
                    292: {
                    293:        register u_char *cp, *ep;
                    294:
                    295: #ifdef DEBUG
                    296:        if ((statp->options & RES_DEBUG) != 0U)
                    297:                printf(";; res_nopt_rdata()\n");
                    298: #endif
                    299:
                    300:        cp = buf + n0;
                    301:        ep = buf + buflen;
                    302:
                    303:        if ((ep - cp) < (4 + len))
                    304:                return (-1);
                    305:
                    306:        if (rdata < (buf + 2) || rdata >= ep)
                    307:                return (-1);
                    308:
                    309:        ns_put16(code, cp);
                    310:        cp += INT16SZ;
                    311:
                    312:        ns_put16(len, cp);
                    313:        cp += INT16SZ;
                    314:
1.12      christos  315:        memcpy(cp, data, (size_t)len);
1.9       christos  316:        cp += len;
                    317:
1.13    ! christos  318:        _DIAGASSERT(__type_fit(u_short, cp - rdata));
        !           319:        len = (u_short)(cp - rdata);
1.9       christos  320:        ns_put16(len, rdata - 2);       /* Update RDLEN field */
                    321:
1.13    ! christos  322:        _DIAGASSERT(__type_fit(int, cp - buf));
        !           323:        return (int)(cp - buf);
1.9       christos  324: }
1.1       christos  325: #endif
1.7       christos  326:
                    327: /*! \file */

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