/contrib/bind9/lib/lwres/lwinetaton.c

  1/*
  2 * Portions Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
  3 * Portions Copyright (C) 1996-2001, 2003  Internet Software Consortium.
  4 *
  5 * Permission to use, copy, modify, and/or distribute this software for any
  6 * purpose with or without fee is hereby granted, provided that the above
  7 * copyright notice and this permission notice appear in all copies.
  8 *
  9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 15 * PERFORMANCE OF THIS SOFTWARE.
 16 */
 17
 18/*
 19 * Copyright (c) 1983, 1990, 1993
 20 *    The Regents of the University of California.  All rights reserved.
 21 *
 22 * Redistribution and use in source and binary forms, with or without
 23 * modification, are permitted provided that the following conditions
 24 * are met:
 25 * 1. Redistributions of source code must retain the above copyright
 26 *    notice, this list of conditions and the following disclaimer.
 27 * 2. Redistributions in binary form must reproduce the above copyright
 28 *    notice, this list of conditions and the following disclaimer in the
 29 *    documentation and/or other materials provided with the distribution.
 30 * 3. All advertising materials mentioning features or use of this software
 31 *    must display the following acknowledgement:
 32 * 	This product includes software developed by the University of
 33 * 	California, Berkeley and its contributors.
 34 * 4. Neither the name of the University nor the names of its contributors
 35 *    may be used to endorse or promote products derived from this software
 36 *    without specific prior written permission.
 37 *
 38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 41 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 48 * SUCH DAMAGE.
 49 */
 50
 51/*
 52 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 53 *
 54 * Permission to use, copy, modify, and distribute this software for any
 55 * purpose with or without fee is hereby granted, provided that the above
 56 * copyright notice and this permission notice appear in all copies, and that
 57 * the name of Digital Equipment Corporation not be used in advertising or
 58 * publicity pertaining to distribution of the document or software without
 59 * specific, written prior permission.
 60 *
 61 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
 62 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
 63 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
 64 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 65 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 66 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 67 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 68 * SOFTWARE.
 69 */
 70
 71/*! \file lwinetaton.c
 72 */
 73#if defined(LIBC_SCCS) && !defined(lint)
 74static char sccsid[] = "@(#)inet_addr.c	8.1 (Berkeley) 6/17/93";
 75static char rcsid[] = "$Id: lwinetaton.c,v 1.16 2007/06/19 23:47:22 tbox Exp $";
 76#endif /* LIBC_SCCS and not lint */
 77
 78#include <config.h>
 79
 80#include <ctype.h>
 81
 82#include <stddef.h>
 83
 84#include <lwres/int.h>
 85#include <lwres/net.h>
 86
 87#include "assert_p.h"
 88
 89/*!
 90 * Check whether "cp" is a valid ascii representation
 91 * of an Internet address and convert to a binary address.
 92 * Returns 1 if the address is valid, 0 if not.
 93 * This replaces inet_addr, the return value from which
 94 * cannot distinguish between failure and a local broadcast address.
 95 */
 96int
 97lwres_net_aton(const char *cp, struct in_addr *addr) {
 98	unsigned long val;
 99	int base, n;
100	unsigned char c;
101	lwres_uint8_t parts[4];
102	lwres_uint8_t *pp = parts;
103	int digit;
104
105	REQUIRE(cp != NULL);
106
107	c = *cp;
108	for (;;) {
109		/*
110		 * Collect number up to ``.''.
111		 * Values are specified as for C:
112		 * 0x=hex, 0=octal, isdigit=decimal.
113		 */
114		if (!isdigit(c & 0xff))
115			return (0);
116		val = 0;
117		base = 10;
118		digit = 0;
119		if (c == '0') {
120			c = *++cp;
121			if (c == 'x' || c == 'X') {
122				base = 16;
123			       	c = *++cp;
124			} else {
125				base = 8;
126				digit = 1;
127			}
128		}
129		for (;;) {
130			/*
131			 * isascii() is valid for all integer values, and
132			 * when it is true, c is known to be in scope
133			 * for isdigit().  No cast necessary.  Similar
134			 * comment applies for later ctype uses.
135			 */
136			if (isascii(c) && isdigit(c)) {
137				if (base == 8 && (c == '8' || c == '9'))
138					return (0);
139				val = (val * base) + (c - '0');
140				c = *++cp;
141				digit = 1;
142			} else if (base == 16 && isascii(c) && isxdigit(c)) {
143				val = (val << 4) |
144					(c + 10 - (islower(c) ? 'a' : 'A'));
145				c = *++cp;
146				digit = 1;
147			} else
148				break;
149		}
150		if (c == '.') {
151			/*
152			 * Internet format:
153			 *	a.b.c.d
154			 *	a.b.c	(with c treated as 16 bits)
155			 *	a.b	(with b treated as 24 bits)
156			 */
157			if (pp >= parts + 3 || val > 0xffU)
158				return (0);
159			*pp++ = (lwres_uint8_t)val;
160			c = *++cp;
161		} else
162			break;
163	}
164	/*
165	 * Check for trailing characters.
166	 */
167	if (c != '\0' && (!isascii(c) || !isspace(c)))
168		return (0);
169	/*
170	 * Did we get a valid digit?
171	 */
172	if (!digit)
173		return (0);
174	/*
175	 * Concoct the address according to
176	 * the number of parts specified.
177	 */
178	n = pp - parts + 1;
179	switch (n) {
180	case 1:				/* a -- 32 bits */
181		break;
182
183	case 2:				/* a.b -- 8.24 bits */
184		if (val > 0xffffffU)
185			return (0);
186		val |= parts[0] << 24;
187		break;
188
189	case 3:				/* a.b.c -- 8.8.16 bits */
190		if (val > 0xffffU)
191			return (0);
192		val |= (parts[0] << 24) | (parts[1] << 16);
193		break;
194
195	case 4:				/* a.b.c.d -- 8.8.8.8 bits */
196		if (val > 0xffU)
197			return (0);
198		val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
199		break;
200	}
201	if (addr != NULL)
202		addr->s_addr = htonl(val);
203
204	return (1);
205}