1 /* $NetBSD: inet_addr.c,v 1.2 2018/04/07 22:37:30 christos Exp $ */
2
3 /* NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp */
4
5 /*
6 * Copyright (c) 1983, 1990, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. 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 #include <sys/cdefs.h>
35 __RCSID("$NetBSD: inet_addr.c,v 1.2 2018/04/07 22:37:30 christos Exp $");
36
37
38 #include "dhcpd.h"
39
40 #include "omapip/omapip_p.h"
41
42 #ifdef NEED_INET_ATON
43 /*
44 * Check whether "cp" is a valid ascii representation
45 * of an Internet address and convert to a binary address.
46 * Returns 1 if the address is valid, 0 if not.
47 * This replaces inet_addr, the return value from which
48 * cannot distinguish between failure and a local broadcast address.
49 */
50 int
inet_aton(cp,addr)51 inet_aton(cp, addr)
52 const char *cp;
53 struct in_addr *addr;
54 {
55 register u_long val;
56 register int base, n;
57 register char c;
58 u_int parts[4];
59 register u_int *pp = parts;
60
61 for (;;) {
62 /*
63 * Collect number up to ``.''.
64 * Values are specified as for C:
65 * 0x=hex, 0=octal, other=decimal.
66 */
67 val = 0; base = 10;
68 if (*cp == '0') {
69 if (*++cp == 'x' || *cp == 'X')
70 base = 16, cp++;
71 else
72 base = 8;
73 }
74 while ((c = *cp) != '\0') {
75 if (isascii(c) && isdigit((int)c)) {
76 val = (val * base) + (c - '0');
77 cp++;
78 continue;
79 }
80 if (base == 16 && isascii(c) && isxdigit((int)c)) {
81 val = (val << 4) +
82 (c + 10 - (islower((int)c) ? 'a' : 'A'));
83 cp++;
84 continue;
85 }
86 break;
87 }
88 if (*cp == '.') {
89 /*
90 * Internet format:
91 * a.b.c.d
92 * a.b.c (with c treated as 16-bits)
93 * a.b (with b treated as 24 bits)
94 */
95 if (pp >= parts + 3 || val > 0xff)
96 return (0);
97 *pp++ = val, cp++;
98 } else
99 break;
100 }
101 /*
102 * Check for trailing characters.
103 */
104 if (*cp && (!isascii(*cp) || !isspace((int)*cp)))
105 return (0);
106 /*
107 * Concoct the address according to
108 * the number of parts specified.
109 */
110 n = pp - parts + 1;
111 switch (n) {
112
113 case 0:
114 return (0); /* initial nondigit */
115
116 case 1: /* a -- 32 bits */
117 break;
118
119 case 2: /* a.b -- 8.24 bits */
120 if (val > 0xffffff)
121 return (0);
122 val |= parts[0] << 24;
123 break;
124
125 case 3: /* a.b.c -- 8.8.16 bits */
126 if (val > 0xffff)
127 return (0);
128 val |= (parts[0] << 24) | (parts[1] << 16);
129 break;
130
131 case 4: /* a.b.c.d -- 8.8.8.8 bits */
132 if (val > 0xff)
133 return (0);
134 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
135 break;
136 }
137 if (addr)
138 addr->s_addr = htonl(val);
139 return (1);
140 }
141 #endif
142