/* $NetBSD: res_mkquery.c,v 1.6 2006/01/24 17:40:32 christos Exp $ */ /* * Copyright (c) 2008 Android Open Source Project (query id randomization) * 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 (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * 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 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. */ #include #if defined(LIBC_SCCS) && !defined(lint) #ifdef notdef static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; static const char rcsid[] = "Id: res_mkquery.c,v 1.1.2.2.4.2 2004/03/16 12:34:18 marka Exp"; #else __RCSID("$NetBSD: res_mkquery.c,v 1.6 2006/01/24 17:40:32 christos Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #include #include #include #include "arpa_nameser.h" #include #ifdef ANDROID_CHANGES #include "resolv_private.h" #else #include #endif #include #include /* Options. Leave them on. */ #ifndef DEBUG #define DEBUG #endif #ifndef lint #define UNUSED(a) (void)&a #else #define UNUSED(a) a = a #endif 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 */ { register HEADER *hp; register u_char *cp, *ep; register 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 *)(void *)buf; hp->id = htons(res_randomid()); 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 + sizeof dnptrs / sizeof dnptrs[0]; /* * 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, (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). */ #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 */ { register HEADER *hp; register u_char *cp, *ep; u_int16_t flags = 0; #ifdef DEBUG if ((statp->options & RES_DEBUG) != 0U) printf(";; res_nopt()\n"); #endif hp = (HEADER *)(void *)buf; cp = buf + n0; ep = buf + buflen; if ((ep - cp) < 1 + RRFIXEDSZ) return (-1); *cp++ = 0; /* "." */ ns_put16(T_OPT, cp); /* TYPE */ cp += INT16SZ; 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(0, cp); /* RDLEN */ cp += INT16SZ; hp->arcount = htons(ntohs(hp->arcount) + 1); return (cp - buf); } #endif