inet_network.c revision 156953 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static const char sccsid[] = "@(#)inet_network.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37
38#include "port_before.h"
39
40#include <sys/types.h>
41#include <netinet/in.h>
42#include <arpa/inet.h>
43#include <ctype.h>
44
45#include "port_after.h"
46
47/*
48 * Internet network address interpretation routine.
49 * The library routines call this routine to interpret
50 * network numbers.
51 */
52u_long
53inet_network(cp)
54	register const char *cp;
55{
56	register u_long val, base, n, i;
57	register char c;
58	u_long parts[4], *pp = parts;
59	int digit;
60
61again:
62	val = 0; base = 10; digit = 0;
63	if (*cp == '0')
64		digit = 1, base = 8, cp++;
65	if (*cp == 'x' || *cp == 'X')
66		base = 16, cp++;
67	while ((c = *cp) != 0) {
68		if (isdigit((unsigned char)c)) {
69			if (base == 8U && (c == '8' || c == '9'))
70				return (INADDR_NONE);
71			val = (val * base) + (c - '0');
72			cp++;
73			digit = 1;
74			continue;
75		}
76		if (base == 16U && isxdigit((unsigned char)c)) {
77			val = (val << 4) +
78			      (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
79			cp++;
80			digit = 1;
81			continue;
82		}
83		break;
84	}
85	if (!digit)
86		return (INADDR_NONE);
87	if (*cp == '.') {
88		if (pp >= parts + 4 || val > 0xffU)
89			return (INADDR_NONE);
90		*pp++ = val, cp++;
91		goto again;
92	}
93	if (*cp && !isspace(*cp&0xff))
94		return (INADDR_NONE);
95	*pp++ = val;
96	n = pp - parts;
97	if (n > 4U)
98		return (INADDR_NONE);
99	for (val = 0, i = 0; i < n; i++) {
100		val <<= 8;
101		val |= parts[i] & 0xff;
102	}
103	return (val);
104}
105