/* $NetBSD: res_mkquery.c,v 1.21 2000/12/20 18:47:37 christos Exp $ */ /*- * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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. * - * --Copyright-- */ #include #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; static char rcsid[] = "Id: res_mkquery.c,v 8.5 1996/08/27 08:33:28 vixie Exp "; #else __RCSID("$NetBSD: res_mkquery.c,v 1.21 2000/12/20 18:47:37 christos Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #if defined(_LIBC) #include "namespace.h" #endif #include #include #include #include #include #include #include #include #include #if defined(_LIBC) && defined(__weak_alias) __weak_alias(res_mkquery,_res_mkquery) #endif /* * Form all types of queries. * Returns the size of the result or -1. */ /* ARGSUSED */ int res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen) int op; /* opcode of query */ const char *dname; /* domain name */ int class, 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 */ { register HEADER *hp; register u_char *cp; register int n; u_char *dnptrs[20], **dpp, **lastdnptr; _DIAGASSERT(dname != NULL); /* data may be NULL */ /* newrr_in is not used */ if ((_res.options & RES_INIT) == 0 && res_init() == -1) { h_errno = NETDB_INTERNAL; return (-1); } #ifdef DEBUG if (_res.options & RES_DEBUG) printf(";; res_mkquery(%d, %s, %d, %d)\n", op, dname, class, type); #endif /* * Initialize header fields. */ /*CONSTCOND*/ if (sizeof(HEADER) != HFIXEDSZ) { /* XXX should raise compile time error, not runtime error */ #ifdef DEBUG if (_res.options & RES_DEBUG) printf(";; HFIXEDSZ mismatch with sizeof(HEADER)\n"); #endif return(-1); } if ((buf == NULL) || (buflen < HFIXEDSZ)) return(-1); (void)memset(buf, 0, HFIXEDSZ); hp = (HEADER *)(void *)buf; hp->id = htons(++_res.id); hp->opcode = op; hp->rd = (_res.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 QUERY: /*FALLTHROUGH*/ case NS_NOTIFY_OP: if ((buflen -= QFIXEDSZ) < 0) return (-1); if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0) return (-1); cp += n; buflen -= n; __putshort(type, cp); cp += sizeof(u_int16_t); __putshort(class, cp); cp += sizeof(u_int16_t); hp->qdcount = htons(1); if (op == QUERY || data == NULL) break; /* * Make an additional record for completion domain. */ buflen -= RRFIXEDSZ; if ((n = dn_comp((const char *)data, cp, buflen, dnptrs, lastdnptr)) < 0) return (-1); cp += n; buflen -= n; __putshort(T_NULL, cp); cp += sizeof(u_int16_t); __putshort(class, cp); cp += sizeof(u_int16_t); __putlong(0, cp); cp += sizeof(u_int32_t); __putshort(0, cp); cp += sizeof(u_int16_t); hp->arcount = htons(1); break; case IQUERY: /* * Initialize answer section */ if (buflen < 1 + RRFIXEDSZ + datalen) return (-1); *cp++ = '\0'; /* no domain name */ __putshort(type, cp); cp += sizeof(u_int16_t); __putshort(class, cp); cp += sizeof(u_int16_t); __putlong(0, cp); cp += sizeof(u_int32_t); __putshort(datalen, cp); cp += sizeof(u_int16_t); if (datalen) { (void)memcpy(cp, data, (size_t)datalen); cp += datalen; } hp->ancount = htons(1); break; default: return (-1); } return (cp - buf); } #ifdef RES_USE_EDNS0 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ int res_opt(n0, buf, buflen, anslen) int n0; u_char *buf; /* buffer to put query */ int buflen; /* size of buffer */ int anslen; /* answer buffer length */ { register HEADER *hp; register u_char *cp; hp = (HEADER *)(void *)buf; cp = buf + n0; buflen -= n0; if (buflen < 1 + RRFIXEDSZ) return -1; *cp++ = 0; /* "." */ buflen--; __putshort(T_OPT, cp); /* TYPE */ cp += INT16SZ; __putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */ cp += INT16SZ; *cp++ = NOERROR; /* extended RCODE */ *cp++ = 0; /* EDNS version */ __putshort(0, cp); /* MBZ */ cp += INT16SZ; __putshort(0, cp); /* RDLEN */ cp += INT16SZ; hp->arcount = htons(ntohs(hp->arcount) + 1); buflen -= RRFIXEDSZ; return cp - buf; } #endif