diff options
Diffstat (limited to 'c/src/exec/libnetworking/libc/res_comp.c')
| -rw-r--r-- | c/src/exec/libnetworking/libc/res_comp.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/c/src/exec/libnetworking/libc/res_comp.c b/c/src/exec/libnetworking/libc/res_comp.c new file mode 100644 index 0000000000..93043276f2 --- /dev/null +++ b/c/src/exec/libnetworking/libc/res_comp.c @@ -0,0 +1,258 @@ +/* + * 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 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$"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <sys/param.h> +#include <netinet/in.h> +#include <arpa/nameser.h> +#include <ctype.h> +#include <resolv.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#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 (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(dn) + 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(dn) + 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(dn) + 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 RFC 1034's character sets are only + * recommendations. + */ +int +res_dnok(dn) + 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. + */ +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); } +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 /*BIND_4_COMPAT*/ |