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Annotation of src/lib/libc/resolv/res_mkquery.c, Revision 1.15.8.1

1.15.8.1! snj         1: /*     $NetBSD: res_mkquery.c,v 1.15 2015/02/24 17:56:20 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.
1.15      christos   32:  * 3. Neither the name of the University nor the names of its contributors
1.1       christos   33:  *    may be used to endorse or promote products derived from this software
                     34:  *    without specific prior written permission.
1.11      christos   35:  *
1.1       christos   36:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     37:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     38:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     39:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     40:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     41:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     42:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     43:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     44:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     45:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     46:  * SUCH DAMAGE.
                     47:  */
                     48:
                     49: /*
                     50:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
1.11      christos   51:  *
1.1       christos   52:  * Permission to use, copy, modify, and distribute this software for any
                     53:  * purpose with or without fee is hereby granted, provided that the above
                     54:  * copyright notice and this permission notice appear in all copies, and that
                     55:  * the name of Digital Equipment Corporation not be used in advertising or
                     56:  * publicity pertaining to distribution of the document or software without
                     57:  * specific, written prior permission.
1.11      christos   58:  *
1.1       christos   59:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
                     60:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
                     61:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
                     62:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
                     63:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
                     64:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
                     65:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
                     66:  * SOFTWARE.
                     67:  */
                     68:
1.3       christos   69: #include <sys/cdefs.h>
1.1       christos   70: #if defined(LIBC_SCCS) && !defined(lint)
1.3       christos   71: #ifdef notdef
1.1       christos   72: static const char sccsid[] = "@(#)res_mkquery.c        8.1 (Berkeley) 6/4/93";
1.11      christos   73: static const char rcsid[] = "Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp";
1.3       christos   74: #else
1.15.8.1! snj        75: __RCSID("$NetBSD: res_mkquery.c,v 1.15 2015/02/24 17:56:20 christos Exp $");
1.3       christos   76: #endif
1.1       christos   77: #endif /* LIBC_SCCS and not lint */
                     78:
                     79: #include "port_before.h"
1.4       christos   80:
                     81: #include "namespace.h"
1.1       christos   82: #include <sys/types.h>
                     83: #include <sys/param.h>
                     84: #include <netinet/in.h>
                     85: #include <arpa/nameser.h>
1.13      christos   86: #include <assert.h>
1.1       christos   87: #include <netdb.h>
                     88: #include <resolv.h>
                     89: #include <stdio.h>
                     90: #include <string.h>
                     91: #include "port_after.h"
                     92:
1.5       christos   93: #if 0
1.4       christos   94: #ifdef __weak_alias
                     95: __weak_alias(res_nmkquery,_res_nmkquery)
                     96: __weak_alias(res_nopt,_res_nopt)
                     97: #endif
1.5       christos   98: #endif
1.4       christos   99:
1.1       christos  100: /* Options.  Leave them on. */
1.10      christos  101: #ifndef DEBUG
1.1       christos  102: #define DEBUG
1.10      christos  103: #endif
1.1       christos  104:
                    105: extern const char *_res_opcodes[];
                    106:
1.7       christos  107: /*%
1.1       christos  108:  * Form all types of queries.
                    109:  * Returns the size of the result or -1.
                    110:  */
                    111: int
                    112: res_nmkquery(res_state statp,
1.7       christos  113:             int op,                    /*!< opcode of query  */
                    114:             const char *dname,         /*!< domain name  */
                    115:             int class, int type,       /*!< class and type of query  */
                    116:             const u_char *data,        /*!< resource record data  */
                    117:             int datalen,               /*!< length of data  */
                    118:             const u_char *newrr_in,    /*!< new rr for modify or append  */
                    119:             u_char *buf,               /*!< buffer to put query  */
                    120:             int buflen)                /*!< size of buffer  */
1.1       christos  121: {
                    122:        register HEADER *hp;
                    123:        register u_char *cp, *ep;
                    124:        register int n;
                    125:        u_char *dnptrs[20], **dpp, **lastdnptr;
                    126:
                    127:        UNUSED(newrr_in);
                    128:
                    129: #ifdef DEBUG
                    130:        if (statp->options & RES_DEBUG)
                    131:                printf(";; res_nmkquery(%s, %s, %s, %s)\n",
                    132:                       _res_opcodes[op], dname, p_class(class), p_type(type));
                    133: #endif
                    134:        /*
                    135:         * Initialize header fields.
                    136:         */
                    137:        if ((buf == NULL) || (buflen < HFIXEDSZ))
                    138:                return (-1);
                    139:        memset(buf, 0, HFIXEDSZ);
1.2       christos  140:        hp = (HEADER *)(void *)buf;
1.11      christos  141:        statp->id = res_nrandomid(statp);
                    142:        hp->id = htons(statp->id);
1.1       christos  143:        hp->opcode = op;
                    144:        hp->rd = (statp->options & RES_RECURSE) != 0U;
1.15.8.1! snj       145:        hp->ad = (statp->options & RES_USE_DNSSEC) != 0U;
1.1       christos  146:        hp->rcode = NOERROR;
                    147:        cp = buf + HFIXEDSZ;
                    148:        ep = buf + buflen;
                    149:        dpp = dnptrs;
                    150:        *dpp++ = buf;
                    151:        *dpp++ = NULL;
                    152:        lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
                    153:        /*
                    154:         * perform opcode specific processing
                    155:         */
                    156:        switch (op) {
                    157:        case QUERY:     /*FALLTHROUGH*/
                    158:        case NS_NOTIFY_OP:
                    159:                if (ep - cp < QFIXEDSZ)
                    160:                        return (-1);
1.13      christos  161:                if ((n = dn_comp(dname, cp, (int)(ep - cp - QFIXEDSZ), dnptrs,
1.1       christos  162:                    lastdnptr)) < 0)
                    163:                        return (-1);
                    164:                cp += n;
                    165:                ns_put16(type, cp);
                    166:                cp += INT16SZ;
                    167:                ns_put16(class, cp);
                    168:                cp += INT16SZ;
                    169:                hp->qdcount = htons(1);
                    170:                if (op == QUERY || data == NULL)
                    171:                        break;
                    172:                /*
                    173:                 * Make an additional record for completion domain.
                    174:                 */
                    175:                if ((ep - cp) < RRFIXEDSZ)
                    176:                        return (-1);
1.13      christos  177:                n = dn_comp((const char *)data, cp, (int)(ep - cp - RRFIXEDSZ),
1.1       christos  178:                            dnptrs, lastdnptr);
                    179:                if (n < 0)
                    180:                        return (-1);
                    181:                cp += n;
                    182:                ns_put16(T_NULL, cp);
                    183:                cp += INT16SZ;
                    184:                ns_put16(class, cp);
                    185:                cp += INT16SZ;
                    186:                ns_put32(0, cp);
                    187:                cp += INT32SZ;
                    188:                ns_put16(0, cp);
                    189:                cp += INT16SZ;
                    190:                hp->arcount = htons(1);
                    191:                break;
                    192:
                    193:        case IQUERY:
                    194:                /*
                    195:                 * Initialize answer section
                    196:                 */
                    197:                if (ep - cp < 1 + RRFIXEDSZ + datalen)
                    198:                        return (-1);
1.7       christos  199:                *cp++ = '\0';   /*%< no domain name */
1.1       christos  200:                ns_put16(type, cp);
                    201:                cp += INT16SZ;
                    202:                ns_put16(class, cp);
                    203:                cp += INT16SZ;
                    204:                ns_put32(0, cp);
                    205:                cp += INT32SZ;
                    206:                ns_put16(datalen, cp);
                    207:                cp += INT16SZ;
                    208:                if (datalen) {
1.2       christos  209:                        memcpy(cp, data, (size_t)datalen);
1.1       christos  210:                        cp += datalen;
                    211:                }
                    212:                hp->ancount = htons(1);
                    213:                break;
                    214:
                    215:        default:
                    216:                return (-1);
                    217:        }
1.13      christos  218:        _DIAGASSERT(__type_fit(int, cp - buf));
                    219:        return (int)(cp - buf);
1.1       christos  220: }
                    221:
                    222: #ifdef RES_USE_EDNS0
                    223: /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
                    224:
                    225: int
                    226: res_nopt(res_state statp,
1.7       christos  227:         int n0,                /*%< current offset in buffer */
                    228:         u_char *buf,           /*%< buffer to put query */
                    229:         int buflen,            /*%< size of buffer */
                    230:         int anslen)            /*%< UDP answer buffer size */
1.1       christos  231: {
                    232:        register HEADER *hp;
                    233:        register u_char *cp, *ep;
                    234:        u_int16_t flags = 0;
                    235:
                    236: #ifdef DEBUG
                    237:        if ((statp->options & RES_DEBUG) != 0U)
                    238:                printf(";; res_nopt()\n");
                    239: #endif
                    240:
1.2       christos  241:        hp = (HEADER *)(void *)buf;
1.1       christos  242:        cp = buf + n0;
                    243:        ep = buf + buflen;
                    244:
                    245:        if ((ep - cp) < 1 + RRFIXEDSZ)
                    246:                return (-1);
                    247:
1.11      christos  248:        *cp++ = 0;                              /*%< "." */
                    249:        ns_put16(ns_t_opt, cp);                 /*%< TYPE */
1.1       christos  250:        cp += INT16SZ;
1.14      christos  251:        if (anslen > 0xffff)
                    252:                anslen = 0xffff;
                    253:        ns_put16(anslen, cp);                   /*%< CLASS = UDP payload size */
1.1       christos  254:        cp += INT16SZ;
1.11      christos  255:        *cp++ = NOERROR;                        /*%< extended RCODE */
                    256:        *cp++ = 0;                              /*%< EDNS version */
1.9       christos  257:
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;
1.9       christos  267:
1.11      christos  268:        ns_put16(0U, cp);                       /*%< RDLEN */
1.1       christos  269:        cp += INT16SZ;
1.9       christos  270:
1.1       christos  271:        hp->arcount = htons(ntohs(hp->arcount) + 1);
                    272:
1.13      christos  273:        _DIAGASSERT(__type_fit(int, cp - buf));
                    274:        return (int)(cp - buf);
1.1       christos  275: }
1.9       christos  276:
                    277: /*
                    278:  * Construct variable data (RDATA) block for OPT psuedo-RR, append it
                    279:  * to the buffer, then update the RDLEN field (previously set to zero by
                    280:  * res_nopt()) with the new RDATA length.
                    281:  */
                    282: int
                    283: res_nopt_rdata(res_state statp,
                    284:          int n0,               /*%< current offset in buffer */
                    285:          u_char *buf,          /*%< buffer to put query */
                    286:          int buflen,           /*%< size of buffer */
                    287:          u_char *rdata,        /*%< ptr to start of opt rdata */
                    288:          u_short code,         /*%< OPTION-CODE */
                    289:          u_short len,          /*%< OPTION-LENGTH */
                    290:          u_char *data)         /*%< OPTION_DATA */
                    291: {
                    292:        register u_char *cp, *ep;
                    293:
                    294: #ifdef DEBUG
                    295:        if ((statp->options & RES_DEBUG) != 0U)
                    296:                printf(";; res_nopt_rdata()\n");
                    297: #endif
                    298:
                    299:        cp = buf + n0;
                    300:        ep = buf + buflen;
                    301:
                    302:        if ((ep - cp) < (4 + len))
                    303:                return (-1);
                    304:
                    305:        if (rdata < (buf + 2) || rdata >= ep)
                    306:                return (-1);
                    307:
                    308:        ns_put16(code, cp);
                    309:        cp += INT16SZ;
                    310:
                    311:        ns_put16(len, cp);
                    312:        cp += INT16SZ;
                    313:
1.12      christos  314:        memcpy(cp, data, (size_t)len);
1.9       christos  315:        cp += len;
                    316:
1.13      christos  317:        _DIAGASSERT(__type_fit(u_short, cp - rdata));
                    318:        len = (u_short)(cp - rdata);
1.9       christos  319:        ns_put16(len, rdata - 2);       /* Update RDLEN field */
                    320:
1.13      christos  321:        _DIAGASSERT(__type_fit(int, cp - buf));
                    322:        return (int)(cp - buf);
1.9       christos  323: }
1.1       christos  324: #endif
1.7       christos  325:
                    326: /*! \file */

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