/* * 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. */ /* * Portions copyright (c) 1999, 2000 * Intel Corporation. * 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 Intel Corporation and * its contributors. * * 4. Neither the name of Intel Corporation or its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION 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 INTEL CORPORATION 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. * */ #ifndef lint static char rcsid[] = "$Id: ns_parse.c,v 1.1.1.1 2003/11/19 01:51:33 kyu3 Exp $"; #endif #include #include #include #include #include #include /* These need to be in the same order as the nres.h:ns_flag enum. */ struct _ns_flagdata _ns_flagdata[16] = { { 0x8000, 15 }, /* qr. */ { 0x7800, 11 }, /* opcode. */ { 0x0400, 10 }, /* aa. */ { 0x0200, 9 }, /* tc. */ { 0x0100, 8 }, /* rd. */ { 0x0080, 7 }, /* ra. */ { 0x0040, 6 }, /* z. */ { 0x0020, 5 }, /* ad. */ { 0x0010, 4 }, /* cd. */ { 0x000f, 0 }, /* rcode. */ { 0x0000, 0 }, /* expansion (1/6). */ { 0x0000, 0 }, /* expansion (2/6). */ { 0x0000, 0 }, /* expansion (3/6). */ { 0x0000, 0 }, /* expansion (4/6). */ { 0x0000, 0 }, /* expansion (5/6). */ { 0x0000, 0 }, /* expansion (6/6). */ }; static int skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) { const u_char *optr = ptr; for ((void)NULL; count > 0; count--) { int b, rdlength; b = dn_skipname(ptr, eom); if (b < 0) goto emsgsize; ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/; if (section != ns_s_qd) { if (ptr + NS_INT32SZ > eom) goto emsgsize; ptr += NS_INT32SZ/*TTL*/; if (ptr + NS_INT16SZ > eom) goto emsgsize; NS_GET16(rdlength, ptr); ptr += rdlength/*RData*/; } } if (ptr > eom) goto emsgsize; return ((int)(ptr - optr)); emsgsize: errno = EMSGSIZE; return (-1); } int ns_initparse(const u_char *msg, int msglen, ns_msg *handle) { const u_char *eom = msg + msglen; int i; memset(handle, 0x5e, sizeof *handle); handle->_msg = msg; handle->_eom = eom; if (msg + NS_INT16SZ > eom) goto emsgsize; NS_GET16(handle->_id, msg); if (msg + NS_INT16SZ > eom) goto emsgsize; NS_GET16(handle->_flags, msg); for (i = 0; i < ns_s_max; i++) { if (msg + NS_INT16SZ > eom) goto emsgsize; NS_GET16(handle->_counts[i], msg); } for (i = 0; i < ns_s_max; i++) if (handle->_counts[i] == 0) handle->_sections[i] = NULL; else { int b = skiprr(msg, eom, (ns_sect)i, handle->_counts[i]); if (b < 0) return (-1); handle->_sections[i] = msg; msg += b; } if (msg != eom) goto emsgsize; handle->_sect = ns_s_max; handle->_rrnum = -1; handle->_msg_ptr = NULL; return (0); emsgsize: errno = EMSGSIZE; return (-1); } int ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) { int b; /* Make section right. */ if (section < 0 || section >= ns_s_max) goto enodev; if ((int)section != (int)handle->_sect) { handle->_sect = section; handle->_rrnum = 0; handle->_msg_ptr = handle->_sections[(int)section]; } /* Make rrnum right. */ if (rrnum == -1) rrnum = handle->_rrnum; if (rrnum < 0 || rrnum >= handle->_counts[(int)section]) goto enodev; if (rrnum < handle->_rrnum) { handle->_rrnum = 0; handle->_msg_ptr = handle->_sections[(int)section]; } b = skiprr(handle->_msg, handle->_eom, section, rrnum - handle->_rrnum); if (b < 0) return (-1); handle->_msg_ptr += b; handle->_rrnum = rrnum; /* Do the parse. */ b = dn_expand(handle->_msg, handle->_eom, handle->_msg_ptr, rr->name, NS_MAXDNAME); if (b < 0) return (-1); handle->_msg_ptr += b; if (handle->_msg_ptr + NS_INT16SZ > handle->_eom) goto emsgsize; NS_GET16(rr->type, handle->_msg_ptr); if (handle->_msg_ptr + NS_INT16SZ > handle->_eom) goto emsgsize; NS_GET16(rr->rr_class, handle->_msg_ptr); if (section == ns_s_qd) { rr->ttl = 0; rr->rdlength = 0; rr->rdata = NULL; } else { if (handle->_msg_ptr + NS_INT32SZ > handle->_eom) goto emsgsize; NS_GET32(rr->ttl, handle->_msg_ptr); if (handle->_msg_ptr + NS_INT16SZ > handle->_eom) goto emsgsize; NS_GET16(rr->rdlength, handle->_msg_ptr); if (handle->_msg_ptr + rr->rdlength > handle->_eom) goto emsgsize; rr->rdata = handle->_msg_ptr; handle->_msg_ptr += rr->rdlength; } handle->_rrnum++; /* All done. */ return (0); enodev: errno = ENODEV; return (-1); emsgsize: errno = EMSGSIZE; return (-1); }