| 1 | /* |
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| 2 | * Copyright (c) 1985, 1993 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 4. Neither the name of the University nor the names of its contributors |
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| 14 | * may be used to endorse or promote products derived from this software |
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| 15 | * without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 27 | * SUCH DAMAGE. |
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| 28 | */ |
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| 29 | |
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| 30 | /* |
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| 31 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. |
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| 32 | * |
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| 33 | * Permission to use, copy, modify, and distribute this software for any |
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| 34 | * purpose with or without fee is hereby granted, provided that the above |
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| 35 | * copyright notice and this permission notice appear in all copies, and that |
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| 36 | * the name of Digital Equipment Corporation not be used in advertising or |
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| 37 | * publicity pertaining to distribution of the document or software without |
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| 38 | * specific, written prior permission. |
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| 39 | * |
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| 40 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
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| 41 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
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| 42 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
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| 43 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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| 44 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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| 45 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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| 46 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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| 47 | * SOFTWARE. |
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| 48 | */ |
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| 49 | |
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| 50 | /* |
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| 51 | * Portions Copyright (c) 1996-1999 by Internet Software Consortium. |
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| 52 | * |
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| 53 | * Permission to use, copy, modify, and distribute this software for any |
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| 54 | * purpose with or without fee is hereby granted, provided that the above |
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| 55 | * copyright notice and this permission notice appear in all copies. |
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| 56 | * |
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| 57 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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| 58 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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| 59 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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| 60 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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| 61 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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| 62 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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| 63 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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| 64 | * SOFTWARE. |
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| 65 | */ |
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| 66 | |
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| 67 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 68 | static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; |
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| 69 | static const char rcsid[] = "$BINDId: res_mkquery.c,v 8.12 1999/10/13 16:39:40 vixie Exp $"; |
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| 70 | #endif /* LIBC_SCCS and not lint */ |
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| 71 | |
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| 72 | #include <sys/types.h> |
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| 73 | #include <sys/param.h> |
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| 74 | #include <netinet/in.h> |
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| 75 | #include <arpa/nameser.h> |
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| 76 | #include <netdb.h> |
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| 77 | #include <resolv.h> |
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| 78 | #include <stdio.h> |
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| 79 | #include <string.h> |
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| 80 | #include <time.h> |
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| 81 | #include "local.h" |
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| 82 | |
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| 83 | /* Options. Leave them on. */ |
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| 84 | /* #define DEBUG */ |
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| 85 | |
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| 86 | #ifdef _LIBC |
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| 87 | # include <hp-timing.h> |
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| 88 | # if HP_TIMING_AVAIL |
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| 89 | # define RANDOM_BITS(Var) { uint64_t v64; HP_TIMING_NOW (v64); Var = v64; } |
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| 90 | # endif |
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| 91 | #endif |
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| 92 | |
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| 93 | /* |
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| 94 | * Form all types of queries. |
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| 95 | * Returns the size of the result or -1. |
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| 96 | */ |
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| 97 | int |
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| 98 | res_nmkquery(res_state statp, |
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| 99 | int op, /* opcode of query */ |
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| 100 | const char *dname, /* domain name */ |
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| 101 | int class, int type, /* class and type of query */ |
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| 102 | const u_char *data, /* resource record data */ |
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| 103 | int datalen, /* length of data */ |
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| 104 | const u_char *newrr_in, /* new rr for modify or append */ |
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| 105 | u_char *buf, /* buffer to put query */ |
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| 106 | int buflen) /* size of buffer */ |
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| 107 | { |
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| 108 | register HEADER *hp; |
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| 109 | register u_char *cp; |
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| 110 | register int n; |
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| 111 | u_char *dnptrs[20], **dpp, **lastdnptr; |
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| 112 | |
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| 113 | #ifdef DEBUG |
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| 114 | if (statp->options & RES_DEBUG) |
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| 115 | printf(";; res_nmkquery(%s, %s, %s, %s)\n", |
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| 116 | _res_opcodes[op], dname, p_class(class), p_type(type)); |
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| 117 | #endif |
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| 118 | /* |
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| 119 | * Initialize header fields. |
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| 120 | */ |
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| 121 | if ((buf == NULL) || (buflen < HFIXEDSZ)) |
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| 122 | return (-1); |
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| 123 | memset(buf, 0, HFIXEDSZ); |
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| 124 | hp = (HEADER *) buf; |
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| 125 | /* We randomize the IDs every time. The old code just |
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| 126 | incremented by one after the initial randomization which |
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| 127 | still predictable if the application does multiple |
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| 128 | requests. */ |
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| 129 | #if 0 |
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| 130 | hp->id = htons(++statp->id); |
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| 131 | #else |
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| 132 | hp->id = htons(statp->id); |
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| 133 | int randombits; |
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| 134 | do |
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| 135 | { |
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| 136 | #ifdef RANDOM_BITS |
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| 137 | RANDOM_BITS (randombits); |
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| 138 | #else |
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| 139 | struct timeval tv; |
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| 140 | gettimeofday (&tv, NULL); |
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| 141 | randombits = (tv.tv_sec << 8) ^ tv.tv_usec; |
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| 142 | #endif |
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| 143 | } |
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| 144 | while ((randombits & 0xffff) == 0); |
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| 145 | statp->id = (statp->id + randombits) & 0xffff; |
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| 146 | #endif |
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| 147 | hp->opcode = op; |
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| 148 | hp->rd = (statp->options & RES_RECURSE) != 0; |
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| 149 | hp->rcode = NOERROR; |
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| 150 | cp = buf + HFIXEDSZ; |
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| 151 | buflen -= HFIXEDSZ; |
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| 152 | dpp = dnptrs; |
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| 153 | *dpp++ = buf; |
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| 154 | *dpp++ = NULL; |
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| 155 | lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; |
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| 156 | /* |
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| 157 | * perform opcode specific processing |
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| 158 | */ |
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| 159 | switch (op) { |
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| 160 | case QUERY: /*FALLTHROUGH*/ |
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| 161 | case NS_NOTIFY_OP: |
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| 162 | if ((buflen -= QFIXEDSZ) < 0) |
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| 163 | return (-1); |
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| 164 | if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0) |
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| 165 | return (-1); |
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| 166 | cp += n; |
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| 167 | buflen -= n; |
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| 168 | __putshort(type, cp); |
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| 169 | cp += INT16SZ; |
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| 170 | __putshort(class, cp); |
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| 171 | cp += INT16SZ; |
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| 172 | hp->qdcount = htons(1); |
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| 173 | if (op == QUERY || data == NULL) |
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| 174 | break; |
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| 175 | /* |
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| 176 | * Make an additional record for completion domain. |
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| 177 | */ |
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| 178 | buflen -= RRFIXEDSZ; |
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| 179 | n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr); |
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| 180 | if (n < 0) |
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| 181 | return (-1); |
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| 182 | cp += n; |
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| 183 | buflen -= n; |
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| 184 | __putshort(T_NULL, cp); |
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| 185 | cp += INT16SZ; |
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| 186 | __putshort(class, cp); |
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| 187 | cp += INT16SZ; |
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| 188 | __putlong(0, cp); |
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| 189 | cp += INT32SZ; |
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| 190 | __putshort(0, cp); |
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| 191 | cp += INT16SZ; |
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| 192 | hp->arcount = htons(1); |
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| 193 | break; |
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| 194 | |
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| 195 | case IQUERY: |
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| 196 | /* |
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| 197 | * Initialize answer section |
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| 198 | */ |
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| 199 | if (buflen < 1 + RRFIXEDSZ + datalen) |
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| 200 | return (-1); |
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| 201 | *cp++ = '\0'; /* no domain name */ |
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| 202 | __putshort(type, cp); |
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| 203 | cp += INT16SZ; |
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| 204 | __putshort(class, cp); |
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| 205 | cp += INT16SZ; |
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| 206 | __putlong(0, cp); |
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| 207 | cp += INT32SZ; |
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| 208 | __putshort(datalen, cp); |
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| 209 | cp += INT16SZ; |
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| 210 | if (datalen) { |
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| 211 | memcpy(cp, data, datalen); |
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| 212 | cp += datalen; |
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| 213 | } |
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| 214 | hp->ancount = htons(1); |
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| 215 | break; |
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| 216 | |
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| 217 | default: |
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| 218 | return (-1); |
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| 219 | } |
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| 220 | return (cp - buf); |
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| 221 | } |
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| 222 | libresolv_hidden_def (res_nmkquery) |
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