1 /* $NetBSD: inet_network.c,v 1.4 2008/01/20 04:56:08 christos 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
35 static char sccsid[] = "@(#)inet_network.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: inet_network.c,v 1.4 2008/01/20 04:56:08 christos 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
__weak_alias(inet_network,_inet_network)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 */
61 in_addr_t
62 inet_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
72 again:
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