1/*	$NetBSD: inet_network.c,v 1.3 2008/01/19 03:46:52 ginsbach Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)inet_network.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: inet_network.c,v 1.3 2008/01/19 03:46:52 ginsbach Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42#include <sys/types.h>
43#include <netinet/in.h>
44#include <arpa/inet.h>
45
46#include <assert.h>
47#include <ctype.h>
48#ifdef _DIAGNOSTIC
49#include <stddef.h>	/* for NULL */
50#endif
51
52#ifdef __weak_alias
53__weak_alias(inet_network,_inet_network)
54#endif
55
56/*
57 * Internet network address interpretation routine.
58 * The library routines call this routine to interpret
59 * network numbers.
60 */
61in_addr_t
62inet_network(const char *cp)
63{
64	in_addr_t val;
65	size_t i, n;
66	u_char c;
67	in_addr_t parts[4], *pp = parts;
68	int digit, base;
69
70	_DIAGASSERT(cp != NULL);
71
72again:
73	val = 0; base = 10; digit = 0;
74	if (*cp == '0')
75		digit = 1, base = 8, cp++;
76	if (*cp == 'x' || *cp == 'X')
77		digit = 0, base = 16, cp++;
78	while ((c = *cp) != 0) {
79		if (isdigit(c)) {
80			if (base == 8 && (c == '8' || c == '9'))
81				return (INADDR_NONE);
82			val = (val * base) + (c - '0');
83			cp++;
84			digit = 1;
85			continue;
86		}
87		if (base == 16 && isxdigit(c)) {
88			val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
89			cp++;
90			digit = 1;
91			continue;
92		}
93		break;
94	}
95	if (!digit)
96		return (INADDR_NONE);
97	if (pp >= parts + 4 || val > 0xff)
98		return (INADDR_NONE);
99	if (*cp == '.') {
100		*pp++ = val, cp++;
101		goto again;
102	}
103	if (*cp && !isspace((u_char) *cp))
104		return (INADDR_NONE);
105	*pp++ = val;
106	n = pp - parts;
107	if (n > 4)
108		return (INADDR_NONE);
109	for (val = 0, i = 0; i < n; i++) {
110		val <<= 8;
111		val |= parts[i] & 0xff;
112	}
113	return (val);
114}
115