| /* |
| * Copyright (c) 1985, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 4. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| /* |
| * Portions Copyright (c) 1993 by Digital Equipment Corporation. |
| * |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies, and that |
| * the name of Digital Equipment Corporation not be used in advertising or |
| * publicity pertaining to distribution of the document or software without |
| * specific, written prior permission. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
| * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
| * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| * SOFTWARE. |
| */ |
| |
| /* |
| * Portions Copyright (c) 1996-1999 by Internet Software Consortium. |
| * |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
| * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
| * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| * SOFTWARE. |
| */ |
| |
| #if defined(LIBC_SCCS) && !defined(lint) |
| static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; |
| static const char rcsid[] = "$BINDId: res_mkquery.c,v 8.12 1999/10/13 16:39:40 vixie Exp $"; |
| #endif /* LIBC_SCCS and not lint */ |
| |
| #include <sys/types.h> |
| #include <sys/param.h> |
| #include <netinet/in.h> |
| #include <arpa/nameser.h> |
| #include <netdb.h> |
| #include <resolv.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/time.h> |
| |
| /* Options. Leave them on. */ |
| /* #define DEBUG */ |
| |
| #ifdef _LIBC |
| # include <hp-timing.h> |
| # include <stdint.h> |
| # if HP_TIMING_AVAIL |
| # define RANDOM_BITS(Var) { uint64_t v64; HP_TIMING_NOW (v64); Var = v64; } |
| # endif |
| #endif |
| |
| /* |
| * Form all types of queries. |
| * Returns the size of the result or -1. |
| */ |
| int |
| res_nmkquery(res_state statp, |
| int op, /* opcode of query */ |
| const char *dname, /* domain name */ |
| int class, int type, /* class and type of query */ |
| const u_char *data, /* resource record data */ |
| int datalen, /* length of data */ |
| const u_char *newrr_in, /* new rr for modify or append */ |
| u_char *buf, /* buffer to put query */ |
| int buflen) /* size of buffer */ |
| { |
| HEADER *hp; |
| u_char *cp; |
| int n; |
| u_char *dnptrs[20], **dpp, **lastdnptr; |
| |
| #ifdef DEBUG |
| if (statp->options & RES_DEBUG) |
| printf(";; res_nmkquery(%s, %s, %s, %s)\n", |
| _res_opcodes[op], dname, p_class(class), p_type(type)); |
| #endif |
| /* |
| * Initialize header fields. |
| */ |
| if ((buf == NULL) || (buflen < HFIXEDSZ)) |
| return (-1); |
| memset(buf, 0, HFIXEDSZ); |
| hp = (HEADER *) buf; |
| /* We randomize the IDs every time. The old code just |
| incremented by one after the initial randomization which |
| still predictable if the application does multiple |
| requests. */ |
| int randombits; |
| do |
| { |
| #ifdef RANDOM_BITS |
| RANDOM_BITS (randombits); |
| #else |
| struct timeval tv; |
| __gettimeofday (&tv, NULL); |
| randombits = (tv.tv_sec << 8) ^ tv.tv_usec; |
| #endif |
| } |
| while ((randombits & 0xffff) == 0); |
| statp->id = (statp->id + randombits) & 0xffff; |
| hp->id = statp->id; |
| hp->opcode = op; |
| hp->rd = (statp->options & RES_RECURSE) != 0; |
| hp->rcode = NOERROR; |
| cp = buf + HFIXEDSZ; |
| buflen -= HFIXEDSZ; |
| dpp = dnptrs; |
| *dpp++ = buf; |
| *dpp++ = NULL; |
| lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; |
| /* |
| * perform opcode specific processing |
| */ |
| switch (op) { |
| case NS_NOTIFY_OP: |
| if ((buflen -= QFIXEDSZ + (data == NULL ? 0 : RRFIXEDSZ)) < 0) |
| return (-1); |
| goto compose; |
| |
| case QUERY: |
| if ((buflen -= QFIXEDSZ) < 0) |
| return (-1); |
| compose: |
| n = ns_name_compress(dname, cp, buflen, |
| (const u_char **) dnptrs, |
| (const u_char **) lastdnptr); |
| if (n < 0) |
| return (-1); |
| cp += n; |
| buflen -= n; |
| NS_PUT16 (type, cp); |
| NS_PUT16 (class, cp); |
| hp->qdcount = htons(1); |
| if (op == QUERY || data == NULL) |
| break; |
| /* |
| * Make an additional record for completion domain. |
| */ |
| n = ns_name_compress((char *)data, cp, buflen, |
| (const u_char **) dnptrs, |
| (const u_char **) lastdnptr); |
| if (__builtin_expect (n < 0, 0)) |
| return (-1); |
| cp += n; |
| buflen -= n; |
| NS_PUT16 (T_NULL, cp); |
| NS_PUT16 (class, cp); |
| NS_PUT32 (0, cp); |
| NS_PUT16 (0, cp); |
| hp->arcount = htons(1); |
| break; |
| |
| case IQUERY: |
| /* |
| * Initialize answer section |
| */ |
| if (__builtin_expect (buflen < 1 + RRFIXEDSZ + datalen, 0)) |
| return (-1); |
| *cp++ = '\0'; /* no domain name */ |
| NS_PUT16 (type, cp); |
| NS_PUT16 (class, cp); |
| NS_PUT32 (0, cp); |
| NS_PUT16 (datalen, cp); |
| if (datalen) { |
| memcpy(cp, data, datalen); |
| cp += datalen; |
| } |
| hp->ancount = htons(1); |
| break; |
| |
| default: |
| return (-1); |
| } |
| return (cp - buf); |
| } |
| libresolv_hidden_def (res_nmkquery) |
| |
| |
| /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ |
| #ifndef T_OPT |
| #define T_OPT 41 |
| #endif |
| |
| int |
| __res_nopt(res_state statp, |
| int n0, /* current offset in buffer */ |
| u_char *buf, /* buffer to put query */ |
| int buflen, /* size of buffer */ |
| int anslen) /* UDP answer buffer size */ |
| { |
| u_int16_t flags = 0; |
| |
| #ifdef DEBUG |
| if ((statp->options & RES_DEBUG) != 0U) |
| printf(";; res_nopt()\n"); |
| #endif |
| |
| HEADER *hp = (HEADER *) buf; |
| u_char *cp = buf + n0; |
| u_char *ep = buf + buflen; |
| |
| if ((ep - cp) < 1 + RRFIXEDSZ) |
| return -1; |
| |
| *cp++ = 0; /* "." */ |
| |
| NS_PUT16(T_OPT, cp); /* TYPE */ |
| NS_PUT16(MIN(anslen, 0xffff), cp); /* CLASS = UDP payload size */ |
| *cp++ = NOERROR; /* extended RCODE */ |
| *cp++ = 0; /* EDNS version */ |
| |
| if (statp->options & RES_USE_DNSSEC) { |
| #ifdef DEBUG |
| if (statp->options & RES_DEBUG) |
| printf(";; res_opt()... ENDS0 DNSSEC\n"); |
| #endif |
| flags |= NS_OPT_DNSSEC_OK; |
| } |
| |
| NS_PUT16(flags, cp); |
| NS_PUT16(0, cp); /* RDLEN */ |
| hp->arcount = htons(ntohs(hp->arcount) + 1); |
| |
| return cp - buf; |
| } |
| libresolv_hidden_def (__res_nopt) |