/* * Copyright (c) 1985, 1993 * The Regents of the University of California. All rights reserved. * * 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 the University of * California, Berkeley, Intel Corporation, and its contributors. * * 4. Neither the name of University, Intel Corporation, or their respective * 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, 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 THE REGENTS, * 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. * */ /* * 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 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. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93"; static char orig_rcsid[] = "From: Id: res_comp.c,v 8.11 1997/05/21 19:31:04 halley Exp $"; static char rcsid[] = "$Id: res_comp.c,v 1.1.1.1 2003/11/19 01:51:35 kyu3 Exp $"; #endif /* LIBC_SCCS and not lint */ #include #include #include #include #include #include #include #include #include #define BIND_4_COMPAT /* * Expand compressed domain name 'comp_dn' to full domain name. * 'msg' is a pointer to the begining of the message, * 'eomorig' points to the first location after the message, * 'exp_dn' is a pointer to a buffer of size 'length' for the result. * 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'. * Return the size of the compressed name or -1. * '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, (const u_char **)dnptrs, (const u_char **)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); 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) #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 ppch = '\0', pch = PERIOD, ch = *dn++; while (ch != '\0') { int nch = *dn++; if (periodchar(ch)) { (void)NULL; } 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); } ppch = pch, 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