1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 "port_before.h"
33
34#include <sys/types.h>
35#include <netinet/in.h>
36#include <arpa/inet.h>
37#include <ctype.h>
38
39#include "port_after.h"
40
41/*%
42 * Internet network address interpretation routine.
43 * The library routines call this routine to interpret
44 * network numbers.
45 */
46in_addr_t
47inet_network(const char *cp)
48{
49	in_addr_t val, base, n;
50	char c;
51	in_addr_t parts[4], *pp = parts;
52	int i, digit;
53
54again:
55	val = 0; base = 10; digit = 0;
56	if (*cp == '0')
57		digit = 1, base = 8, cp++;
58	if (*cp == 'x' || *cp == 'X')
59		base = 16, cp++;
60	while ((c = *cp) != 0) {
61		if (isdigit((unsigned char)c)) {
62			if (base == 8U && (c == '8' || c == '9'))
63				return (INADDR_NONE);
64			val = (val * base) + (c - '0');
65			cp++;
66			digit = 1;
67			continue;
68		}
69		if (base == 16U && isxdigit((unsigned char)c)) {
70			val = (val << 4) +
71			      (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
72			cp++;
73			digit = 1;
74			continue;
75		}
76		break;
77	}
78	if (!digit)
79		return (INADDR_NONE);
80	if (pp >= parts + 4 || val > 0xffU)
81		return (INADDR_NONE);
82	if (*cp == '.') {
83		*pp++ = val, cp++;
84		goto again;
85	}
86	if (*cp && !isspace(*cp&0xff))
87		return (INADDR_NONE);
88	*pp++ = val;
89	n = pp - parts;
90	if (n > 4U)
91		return (INADDR_NONE);
92	for (val = 0, i = 0; i < n; i++) {
93		val <<= 8;
94		val |= parts[i] & 0xff;
95	}
96	return (val);
97}
98
99/*
100 * Weak aliases for applications that use certain private entry points,
101 * and fail to include <arpa/inet.h>.
102 */
103#undef inet_network
104__weak_reference(__inet_network, inet_network);
105
106/*! \file */
107