ports/glibc-compat/src/res_comp.c - webports - Git at Google

 /*
  * 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.
  * 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.
  */

 #if defined(LIBC_SCCS) && !defined(lint)
 static const char sccsid[] = "@(#)res_comp.c	8.1 (Berkeley) 6/4/93";
 static const char rcsid[] = "$BINDId: res_comp.c,v 8.15 1999/10/13 16:39:39 vixie Exp $";
 #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>
 #include "libc-symbols.h"

 /*
  * 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);
 }
 libresolv_hidden_def (dn_expand)

 /*
  * 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));
 }
 libresolv_hidden_def (dn_comp)

 /*
  * 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);
 }
 libresolv_hidden_def (dn_skipname)

 /*
  * 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	underscorechar(c) ((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) || underscorechar(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);
 }
 libresolv_hidden_def (res_hnok)

 /*
  * 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 RFC 1034'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);
 }
 libresolv_hidden_def (res_dnok)

 #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); }
 libresolv_hidden_def (__putlong)
 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
 libresolv_hidden_def (__putshort)
 #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__*/
 #endif /*BIND_4_COMPAT*/


 #include <shlib-compat.h>

 #if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)
 # undef dn_expand
 weak_alias (__dn_expand, dn_expand);
 #endif
	/*
	* 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.
	* 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.
	*/

	#if defined(LIBC_SCCS) && !defined(lint)
	static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
	static const char rcsid[] = "$BINDId: res_comp.c,v 8.15 1999/10/13 16:39:39 vixie Exp $";
	#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>
	#include "libc-symbols.h"

	/*
	* 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);
	}
	libresolv_hidden_def (dn_expand)

	/*
	* 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));
	}
	libresolv_hidden_def (dn_comp)

	/*
	* 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);
	}
	libresolv_hidden_def (dn_skipname)

	/*
	* 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 underscorechar(c) ((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) \|\| underscorechar(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);
	}
	libresolv_hidden_def (res_hnok)

	/*
	* 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 RFC 1034'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);
	}
	libresolv_hidden_def (res_dnok)

	#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); }
	libresolv_hidden_def (__putlong)
	void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
	libresolv_hidden_def (__putshort)
	#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__/
	#endif /BIND_4_COMPAT/


	#include <shlib-compat.h>

	#if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)
	# undef dn_expand
	weak_alias (__dn_expand, dn_expand);
	#endif