1/*	$OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $	*/
2
3/*
4 * ++Copyright++ 1983, 1990, 1993
5 * -
6 * Copyright (c) 1983, 1990, 1993
7 *    The Regents of the University of California.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 * 	This product includes software developed by the University of
20 * 	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 * -
37 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
38 *
39 * Permission to use, copy, modify, and distribute this software for any
40 * purpose with or without fee is hereby granted, provided that the above
41 * copyright notice and this permission notice appear in all copies, and that
42 * the name of Digital Equipment Corporation not be used in advertising or
43 * publicity pertaining to distribution of the document or software without
44 * specific, written prior permission.
45 *
46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
48 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
53 * SOFTWARE.
54 * -
55 * --Copyright--
56 */
57
58#include "includes.h"
59
60#if !defined(HAVE_INET_ATON)
61
62#if defined(LIBC_SCCS) && !defined(lint)
63#if 0
64static char sccsid[] = "@(#)inet_addr.c	8.1 (Berkeley) 6/17/93";
65static char rcsid[] = "$From: inet_addr.c,v 8.5 1996/08/05 08:31:35 vixie Exp $";
66#else
67static char rcsid[] = "$OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $";
68#endif
69#endif /* LIBC_SCCS and not lint */
70
71#include <sys/types.h>
72#include <sys/param.h>
73#include <netinet/in.h>
74#include <arpa/inet.h>
75#include <ctype.h>
76
77#if 0
78/*
79 * Ascii internet address interpretation routine.
80 * The value returned is in network order.
81 */
82in_addr_t
83inet_addr(cp)
84	register const char *cp;
85{
86	struct in_addr val;
87
88	if (inet_aton(cp, &val))
89		return (val.s_addr);
90	return (INADDR_NONE);
91}
92#endif
93
94/*
95 * Check whether "cp" is a valid ascii representation
96 * of an Internet address and convert to a binary address.
97 * Returns 1 if the address is valid, 0 if not.
98 * This replaces inet_addr, the return value from which
99 * cannot distinguish between failure and a local broadcast address.
100 */
101int
102inet_aton(const char *cp, struct in_addr *addr)
103{
104	register u_int32_t val;
105	register int base, n;
106	register char c;
107	unsigned int parts[4];
108	register unsigned int *pp = parts;
109
110	c = *cp;
111	for (;;) {
112		/*
113		 * Collect number up to ``.''.
114		 * Values are specified as for C:
115		 * 0x=hex, 0=octal, isdigit=decimal.
116		 */
117		if (!isdigit(c))
118			return (0);
119		val = 0; base = 10;
120		if (c == '0') {
121			c = *++cp;
122			if (c == 'x' || c == 'X')
123				base = 16, c = *++cp;
124			else
125				base = 8;
126		}
127		for (;;) {
128			if (isascii(c) && isdigit(c)) {
129				val = (val * base) + (c - '0');
130				c = *++cp;
131			} else if (base == 16 && isascii(c) && isxdigit(c)) {
132				val = (val << 4) |
133					(c + 10 - (islower(c) ? 'a' : 'A'));
134				c = *++cp;
135			} else
136				break;
137		}
138		if (c == '.') {
139			/*
140			 * Internet format:
141			 *	a.b.c.d
142			 *	a.b.c	(with c treated as 16 bits)
143			 *	a.b	(with b treated as 24 bits)
144			 */
145			if (pp >= parts + 3)
146				return (0);
147			*pp++ = val;
148			c = *++cp;
149		} else
150			break;
151	}
152	/*
153	 * Check for trailing characters.
154	 */
155	if (c != '\0' && (!isascii(c) || !isspace(c)))
156		return (0);
157	/*
158	 * Concoct the address according to
159	 * the number of parts specified.
160	 */
161	n = pp - parts + 1;
162	switch (n) {
163
164	case 0:
165		return (0);		/* initial nondigit */
166
167	case 1:				/* a -- 32 bits */
168		break;
169
170	case 2:				/* a.b -- 8.24 bits */
171		if ((val > 0xffffff) || (parts[0] > 0xff))
172			return (0);
173		val |= parts[0] << 24;
174		break;
175
176	case 3:				/* a.b.c -- 8.8.16 bits */
177		if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
178			return (0);
179		val |= (parts[0] << 24) | (parts[1] << 16);
180		break;
181
182	case 4:				/* a.b.c.d -- 8.8.8.8 bits */
183		if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
184			return (0);
185		val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
186		break;
187	}
188	if (addr)
189		addr->s_addr = htonl(val);
190	return (1);
191}
192
193#endif /* !defined(HAVE_INET_ATON) */
194
195#pragma ident	"%Z%%M%	%I%	%E% SMI"
196