/* $NetBSD: res_comp.c,v 1.13 2015/02/24 17:56:20 christos Exp $ */ /* * 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. */ /* * 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. */ #if defined(LIBC_SCCS) && !defined(lint) static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93"; static const char rcsid[] = "$Id: res_comp.c,v 1.5 2005/07/28 06:51:50 marka Exp $"; #endif /* LIBC_SCCS and not lint */ #include "port_before.h" #include <sys/types.h> #include <sys/param.h> #include <netinet/in.h> #include <arpa/nameser.h> #include <assert.h> #include <ctype.h> #include <resolv.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include "port_after.h" #ifdef __weak_alias __weak_alias(dn_expand,_dn_expand) __weak_alias(dn_comp,__dn_comp) #if 0 __weak_alias(dn_skipname,__dn_skipname) __weak_alias(res_hnok,__res_hnok) __weak_alias(res_ownok,__res_ownok) __weak_alias(res_mailok,__res_mailok) __weak_alias(res_dnok,__res_dnok) #endif #endif /*% * Expand compressed domain name 'src' to full domain name. * * \li 'msg' is a pointer to the begining of the message, * \li 'eom' points to the first location after the message, * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result. * \li Return size of compressed name or -1 if there was an error. */ int dn_expand(const u_char *msg, const u_char *eom, const u_char *src, char *dst, int dstsiz) { int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz); if (n > 0 && dst[0] == '.') dst[0] = '\0'; return (n); } /*% * Pack domain name 'exp_dn' in presentation form into 'comp_dn'. * * \li Return the size of the compressed name or -1. * \li 'length' is the size of the array pointed to by 'comp_dn'. */ int dn_comp(const char *src, u_char *dst, int dstsiz, u_char **dnptrs, u_char **lastdnptr) { return (ns_name_compress(src, dst, (size_t)dstsiz, (void *)dnptrs, (void *)lastdnptr)); } /*% * Skip over a compressed domain name. Return the size or -1. */ int dn_skipname(const u_char *ptr, const u_char *eom) { const u_char *saveptr = ptr; if (ns_name_skip(&ptr, eom) == -1) return (-1); assert(INT_MIN <= (ptr - saveptr) && (ptr - saveptr) <= INT_MAX); return (int)(ptr - saveptr); } /*% * Verify that a domain name uses an acceptable character set. * * Note the conspicuous absence of ctype macros in these definitions. On * non-ASCII hosts, we can't depend on string literals or ctype macros to * tell us anything about network-format data. The rest of the BIND system * is not careful about this, but for some reason, we're doing it right here. */ #define PERIOD 0x2e #define hyphenchar(c) ((c) == 0x2d || (c) == 0x5f) #define bslashchar(c) ((c) == 0x5c) #define periodchar(c) ((c) == PERIOD) #define asterchar(c) ((c) == 0x2a) #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \ || ((c) >= 0x61 && (c) <= 0x7a)) #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39) #define borderchar(c) (alphachar(c) || digitchar(c)) #define middlechar(c) (borderchar(c) || hyphenchar(c)) #define domainchar(c) ((c) > 0x20 && (c) < 0x7f) int res_hnok(const char *dn) { int pch = PERIOD, ch = *dn++; while (ch != '\0') { int nch = *dn++; if (periodchar(ch)) { ; } else if (periodchar(pch)) { if (!borderchar(ch)) return (0); } else if (periodchar(nch) || nch == '\0') { if (!borderchar(ch)) return (0); } else { if (!middlechar(ch)) return (0); } pch = ch, ch = nch; } return (1); } /*% * hostname-like (A, MX, WKS) owners can have "*" as their first label * but must otherwise be as a host name. */ int res_ownok(const char *dn) { if (asterchar(dn[0])) { if (periodchar(dn[1])) return (res_hnok(dn+2)); if (dn[1] == '\0') return (1); } return (res_hnok(dn)); } /*% * SOA RNAMEs and RP RNAMEs can have any printable character in their first * label, but the rest of the name has to look like a host name. */ int res_mailok(const char *dn) { int ch, escaped = 0; /* "." is a valid missing representation */ if (*dn == '\0') return (1); /* otherwise <label>.<hostname> */ while ((ch = *dn++) != '\0') { if (!domainchar(ch)) return (0); if (!escaped && periodchar(ch)) break; if (escaped) escaped = 0; else if (bslashchar(ch)) escaped = 1; } if (periodchar(ch)) return (res_hnok(dn)); return (0); } /*% * This function is quite liberal, since RFC1034's character sets are only * recommendations. */ int res_dnok(const char *dn) { int ch; while ((ch = *dn++) != '\0') if (!domainchar(ch)) return (0); return (1); } #ifdef BIND_4_COMPAT /*% * This module must export the following externally-visible symbols: * ___putlong * ___putshort * __getlong * __getshort * Note that one _ comes from C and the others come from us. */ #ifdef SOLARIS2 #ifdef __putlong #undef __putlong #endif #ifdef __putshort #undef __putshort #endif #pragma weak putlong = __putlong #pragma weak putshort = __putshort #endif /* SOLARIS2 */ void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); } void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); } #endif /*BIND_4_COMPAT*/ #ifndef __ultrix__ u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); } u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); } #endif /*__ultrix__*/ /*! \file */
