/*- * SPDX-License-Identifier: (ISC AND BSD-3-Clause) * * Portions Copyright (C) 2004, 2005, 2008 Internet Systems Consortium, Inc. ("ISC") * Portions Copyright (C) 1996, 1997, 1988, 1999, 2001, 2003 Internet Software Consortium. * * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC 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 (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. */ /* * 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. */ #include "port_before.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 "port_after.h" extern const char *_res_opcodes[]; /*% * 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, *ep; int n; u_char *dnptrs[20], **dpp, **lastdnptr; UNUSED(newrr_in); #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; statp->id = res_nrandomid(statp); hp->id = htons(statp->id); hp->opcode = op; hp->rd = (statp->options & RES_RECURSE) != 0U; hp->rcode = NOERROR; cp = buf + HFIXEDSZ; ep = buf + buflen; dpp = dnptrs; *dpp++ = buf; *dpp++ = NULL; lastdnptr = dnptrs + nitems(dnptrs); /* * perform opcode specific processing */ switch (op) { case QUERY: /*FALLTHROUGH*/ case NS_NOTIFY_OP: if (ep - cp < QFIXEDSZ) return (-1); if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, lastdnptr)) < 0) return (-1); cp += n; ns_put16(type, cp); cp += INT16SZ; ns_put16(class, cp); cp += INT16SZ; hp->qdcount = htons(1); if (op == QUERY || data == NULL) break; /* * Make an additional record for completion domain. */ if ((ep - cp) < RRFIXEDSZ) return (-1); n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, dnptrs, lastdnptr); if (n < 0) return (-1); cp += n; ns_put16(T_NULL, cp); cp += INT16SZ; ns_put16(class, cp); cp += INT16SZ; ns_put32(0, cp); cp += INT32SZ; ns_put16(0, cp); cp += INT16SZ; hp->arcount = htons(1); break; case IQUERY: /* * Initialize answer section */ if (ep - cp < 1 + RRFIXEDSZ + datalen) return (-1); *cp++ = '\0'; /*%< no domain name */ ns_put16(type, cp); cp += INT16SZ; ns_put16(class, cp); cp += INT16SZ; ns_put32(0, cp); cp += INT32SZ; ns_put16(datalen, cp); cp += INT16SZ; if (datalen) { memcpy(cp, data, 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_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 */ { HEADER *hp; u_char *cp, *ep; u_int16_t flags = 0; #ifdef DEBUG if ((statp->options & RES_DEBUG) != 0U) printf(";; res_nopt()\n"); #endif hp = (HEADER *) buf; cp = buf + n0; ep = buf + buflen; if ((ep - cp) < 1 + RRFIXEDSZ) return (-1); *cp++ = 0; /*%< "." */ ns_put16(ns_t_opt, cp); /*%< TYPE */ cp += INT16SZ; if (anslen > 0xffff) anslen = 0xffff; /* limit to 16bit value */ ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */ cp += INT16SZ; *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); cp += INT16SZ; ns_put16(0U, cp); /*%< RDLEN */ cp += INT16SZ; hp->arcount = htons(ntohs(hp->arcount) + 1); return (cp - buf); } /* * Construct variable data (RDATA) block for OPT pseudo-RR, append it * to the buffer, then update the RDLEN field (previously set to zero by * res_nopt()) with the new RDATA length. */ int res_nopt_rdata(res_state statp, int n0, /*%< current offset in buffer */ u_char *buf, /*%< buffer to put query */ int buflen, /*%< size of buffer */ u_char *rdata, /*%< ptr to start of opt rdata */ u_short code, /*%< OPTION-CODE */ u_short len, /*%< OPTION-LENGTH */ u_char *data) /*%< OPTION_DATA */ { register u_char *cp, *ep; #ifdef DEBUG if ((statp->options & RES_DEBUG) != 0U) printf(";; res_nopt_rdata()\n"); #endif cp = buf + n0; ep = buf + buflen; if ((ep - cp) < (4 + len)) return (-1); if (rdata < (buf + 2) || rdata >= ep) return (-1); ns_put16(code, cp); cp += INT16SZ; ns_put16(len, cp); cp += INT16SZ; memcpy(cp, data, len); cp += len; len = cp - rdata; ns_put16(len, rdata - 2); /* Update RDLEN field */ return (cp - buf); } #endif /*! \file */
