1/*	$OpenBSD: inet_network.c,v 1.11 2013/11/25 17:29:19 deraadt Exp $ */
2/*
3 * Copyright (c) 1983, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/types.h>
32#include <netinet/in.h>
33#include <arpa/inet.h>
34#include <ctype.h>
35
36/*
37 * Internet network address interpretation routine.
38 * The library routines call this routine to interpret
39 * network numbers.
40 */
41in_addr_t
42inet_network(const char *cp)
43{
44	in_addr_t val, base, n;
45	u_char c;
46	in_addr_t parts[4], *pp = parts;
47	int i;
48
49again:
50	val = 0; base = 10;
51	if (*cp == '0')
52		base = 8, cp++;
53	if (*cp == 'x' || *cp == 'X')
54		base = 16, cp++;
55	while ((c = *cp)) {
56		if (isdigit(c)) {
57			val = (val * base) + (c - '0');
58			cp++;
59			continue;
60		}
61		if (base == 16 && isxdigit(c)) {
62			val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
63			cp++;
64			continue;
65		}
66		break;
67	}
68	if (*cp == '.') {
69		if (pp >= parts + 3)
70			return (INADDR_NONE);
71		*pp++ = val, cp++;
72		goto again;
73	}
74	if (*cp && !isspace(*cp))
75		return (INADDR_NONE);
76	*pp++ = val;
77	n = pp - parts;
78	for (val = 0, i = 0; i < 4; i++) {
79		val <<= 8;
80		if (i < n)
81			val |= parts[i] & 0xff;
82	}
83	return (val);
84}
85