/* * 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. 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. * * @(#)res_mkquery.c 8.1 (Berkeley) 6/4/93 * $From: Id: res_mkquery.c,v 8.9 1997/04/24 22:22:36 vixie Exp $ * $FreeBSD: src/lib/libc/net/res_mkquery.c,v 1.15.2.2 2002/09/20 10:45:35 nectar Exp $ * $DragonFly: src/lib/libc/net/res_mkquery.c,v 1.5 2005/11/13 02:04:47 swildner Exp $ */ /* * 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 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. */ #include #include #include #include #include #include #include #include #include "res_config.h" /* * Form all types of queries. * Returns the size of the result or -1. */ int res_mkquery(int op, /* opcode of query */ const char *dname, /* domain name */ int class, /* class of query */ int type, /* 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; 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. */ if ((buf == NULL) || (buflen < HFIXEDSZ)) return (-1); memset(buf, 0, HFIXEDSZ); hp = (HEADER *) 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 += INT16SZ; __putshort(class, cp); cp += INT16SZ; hp->qdcount = htons(1); if (op == QUERY || data == NULL) break; /* * Make an additional record for completion domain. */ buflen -= RRFIXEDSZ; n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr); if (n < 0) return (-1); cp += n; buflen -= n; __putshort(T_NULL, cp); cp += INT16SZ; __putshort(class, cp); cp += INT16SZ; __putlong(0, cp); cp += INT32SZ; __putshort(0, cp); cp += INT16SZ; 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 += INT16SZ; __putshort(class, cp); cp += INT16SZ; __putlong(0, cp); cp += INT32SZ; __putshort(datalen, cp); cp += INT16SZ; if (datalen) { memcpy(cp, data, datalen); cp += datalen; } hp->ancount = htons(1); break; default: return (-1); } return (cp - buf); } /* * Weak aliases for applications that use certain private entry points, * and fail to include . */ #undef res_mkquery __weak_reference(__res_mkquery, res_mkquery); /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ int res_opt(int n0, u_char *buf, /* buffer to put query */ int buflen, /* size of buffer */ int anslen) /* answer buffer length */ { HEADER *hp; u_char *cp; hp = (HEADER *) buf; cp = buf + n0; buflen -= n0; if (buflen < 1 + RRFIXEDSZ) return -1; *cp++ = 0; /* "." */ buflen--; __putshort(T_OPT, cp); /* TYPE */ cp += INT16SZ; if (anslen > 0xffff) anslen = 0xffff; /* limit to 16bit value */ __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; }