/* * Copyright 2003 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * 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. */ /* * 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. */ #pragma ident "%Z%%M% %I% %E% SMI" #if defined(LIBC_SCCS) && !defined(lint) static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; static const char rcsid[] = "$Id: res_mkquery.c,v 8.16 2003/04/29 02:13:08 marka Exp $"; #endif /* LIBC_SCCS and not lint */ #include "port_before.h" #include #include #include #include #ifdef SUNW_CONFCHECK #include #include #include #endif #include #include #include #include #include "port_after.h" /* Options. Leave them on. */ #define DEBUG extern const char *_res_opcodes[]; #ifdef SUNW_CONFCHECK static int _confcheck(res_state statp); #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 */ { 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 #ifdef SUNW_CONFCHECK /* * 1247019, 1265838, and 4034368: Check to see if we can * bailout quickly. */ if (_confcheck(statp) == -1) { RES_SET_H_ERRNO(statp, NO_RECOVERY); return(-1); } #endif /* * Initialize header fields. */ if ((buf == NULL) || (buflen < HFIXEDSZ)) return (-1); memset(buf, 0, HFIXEDSZ); hp = (HEADER *) buf; hp->id = htons(++statp->id); hp->opcode = op; hp->rd = (statp->options & RES_RECURSE) != 0; 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, 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 */ #ifdef ORIGINAL_ISC_CODE u_char *buf, /* buffer to put query */ #else uchar_t *buf, /* buffer to put query */ #endif 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) != 0) 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(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 #ifdef SUNW_CONFCHECK /* * Kludge to time out quickly if there is no /etc/resolv.conf * and a TCP connection to the local DNS server fails. * * Moved function from res_send.c to res_mkquery.c. This * solves a long timeout problem with nslookup. * * __areweinnamed is needed because there is a possibility that the * user might do bad things to resolv.conf and cause in.named to call * _confcheck and deadlock the server. */ #ifdef SUNW_AREWEINNAMED int __areweinnamed() { return (0); } #endif /* SUNW_AREWEINNAMED */ static int _confcheck(res_state statp) { int ns; struct stat rc_stat; struct sockaddr_in ns_sin; if (__areweinnamed()) return (0); /* First, we check to see if /etc/resolv.conf exists. * If it doesn't, then it is likely that the localhost is * the nameserver. */ if (stat(_PATH_RESCONF, &rc_stat) == -1 && errno == ENOENT) { /* Next, we check to see if _res.nsaddr is set to loopback. * If it isn't, it has been altered by the application * explicitly and we then want to bail with success. */ if (statp->nsaddr.sin_addr.S_un.S_addr == htonl(INADDR_LOOPBACK)) { /* Lastly, we try to connect to the TCP port of the * nameserver. If this fails, then we know that * DNS is misconfigured and we can quickly exit. */ ns = socket(AF_INET, SOCK_STREAM, 0); IN_SET_LOOPBACK_ADDR(&ns_sin); ns_sin.sin_port = htons(NAMESERVER_PORT); if (connect(ns, (struct sockaddr *) &ns_sin, sizeof ns_sin) == -1) { close(ns); return(-1); } else { close(ns); return(0); } } return(0); } return (0); } #endif