1 /* $NetBSD: inet_addr.c,v 1.1.1.3 2014/07/12 11:57:58 spz Exp $ */
2 /* NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp */
3
4 /*
5 * Copyright (c) 1983, 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __RCSID("$NetBSD: inet_addr.c,v 1.1.1.3 2014/07/12 11:57:58 spz Exp $");
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 #if 0
38 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
39 #else
40 static char rcsid[] = "NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp ";
41 #endif
42 #endif /* LIBC_SCCS and not lint */
43
44 #include "dhcpd.h"
45
46 #include "omapip/omapip_p.h"
47
48 #ifdef NEED_INET_ATON
49 /*
50 * Check whether "cp" is a valid ascii representation
51 * of an Internet address and convert to a binary address.
52 * Returns 1 if the address is valid, 0 if not.
53 * This replaces inet_addr, the return value from which
54 * cannot distinguish between failure and a local broadcast address.
55 */
56 int
inet_aton(cp,addr)57 inet_aton(cp, addr)
58 const char *cp;
59 struct in_addr *addr;
60 {
61 register u_long val;
62 register int base, n;
63 register char c;
64 u_int parts[4];
65 register u_int *pp = parts;
66
67 for (;;) {
68 /*
69 * Collect number up to ``.''.
70 * Values are specified as for C:
71 * 0x=hex, 0=octal, other=decimal.
72 */
73 val = 0; base = 10;
74 if (*cp == '0') {
75 if (*++cp == 'x' || *cp == 'X')
76 base = 16, cp++;
77 else
78 base = 8;
79 }
80 while ((c = *cp) != '\0') {
81 if (isascii(c) && isdigit((int)c)) {
82 val = (val * base) + (c - '0');
83 cp++;
84 continue;
85 }
86 if (base == 16 && isascii(c) && isxdigit((int)c)) {
87 val = (val << 4) +
88 (c + 10 - (islower((int)c) ? 'a' : 'A'));
89 cp++;
90 continue;
91 }
92 break;
93 }
94 if (*cp == '.') {
95 /*
96 * Internet format:
97 * a.b.c.d
98 * a.b.c (with c treated as 16-bits)
99 * a.b (with b treated as 24 bits)
100 */
101 if (pp >= parts + 3 || val > 0xff)
102 return (0);
103 *pp++ = val, cp++;
104 } else
105 break;
106 }
107 /*
108 * Check for trailing characters.
109 */
110 if (*cp && (!isascii(*cp) || !isspace((int)*cp)))
111 return (0);
112 /*
113 * Concoct the address according to
114 * the number of parts specified.
115 */
116 n = pp - parts + 1;
117 switch (n) {
118
119 case 0:
120 return (0); /* initial nondigit */
121
122 case 1: /* a -- 32 bits */
123 break;
124
125 case 2: /* a.b -- 8.24 bits */
126 if (val > 0xffffff)
127 return (0);
128 val |= parts[0] << 24;
129 break;
130
131 case 3: /* a.b.c -- 8.8.16 bits */
132 if (val > 0xffff)
133 return (0);
134 val |= (parts[0] << 24) | (parts[1] << 16);
135 break;
136
137 case 4: /* a.b.c.d -- 8.8.8.8 bits */
138 if (val > 0xff)
139 return (0);
140 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
141 break;
142 }
143 if (addr)
144 addr->s_addr = htonl(val);
145 return (1);
146 }
147 #endif
148