1/*-
2 * Copyright (c) 2001 Charles Mott <cm@linktel.net>
3 * 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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26#include <sys/param.h>
27#include <sys/systm.h>
28
29#include <netinet/in.h>
30
31/* XXX ctype.h is missing, see libkern/stdio/scanf.c */
32#if 1
33static inline int
34isspace(char c)
35{
36 return (c == ' ' || c == '\t' || c == '\n' || c == '\12');
37}
38#endif
39
40int
41inet_aton(const char *cp, struct in_addr *addr)
42{
43 u_long parts[4];
44 in_addr_t val = 0;
45 const char *c;
46 char *endptr;
47 int gotend, n;
48
49 c = (const char *)cp;
50 n = 0;
51
52 /*
53 * Run through the string, grabbing numbers until
54 * the end of the string, or some error
55 */
56 gotend = 0;
57 while (!gotend) {
58 unsigned long l;
59
60 l = strtoul(c, &endptr, 0);
61
62 if (l == ULONG_MAX || (l == 0 && endptr == c))
63 return (0);
64
65 val = (in_addr_t)l;
66
67 /*
68 * If the whole string is invalid, endptr will equal
69 * c.. this way we can make sure someone hasn't
70 * gone '.12' or something which would get past
71 * the next check.
72 */
73 if (endptr == c)
74 return (0);
75 parts[n] = val;
76 c = endptr;
77
78 /* Check the next character past the previous number's end */
79 switch (*c) {
80 case '.' :
81
82 /* Make sure we only do 3 dots .. */
83 if (n == 3) /* Whoops. Quit. */
84 return (0);
85 n++;
86 c++;
87 break;
88
89 case '\0':
90 gotend = 1;
91 break;
92
93 default:
94 if (isspace((unsigned char)*c)) {
95 gotend = 1;
96 break;
97 } else {
98
99 /* Invalid character, then fail. */
100 return (0);
101 }
102 }
103
104 }
105
106 /* Concoct the address according to the number of parts specified. */
107 switch (n) {
108 case 0: /* a -- 32 bits */
109
110 /*
111 * Nothing is necessary here. Overflow checking was
112 * already done in strtoul().
113 */
114 break;
115 case 1: /* a.b -- 8.24 bits */
116 if (val > 0xffffff || parts[0] > 0xff)
117 return (0);
118 val |= parts[0] << 24;
119 break;
120
121 case 2: /* a.b.c -- 8.8.16 bits */
122 if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff)
123 return (0);
124 val |= (parts[0] << 24) | (parts[1] << 16);
125 break;
126
127 case 3: /* a.b.c.d -- 8.8.8.8 bits */
128 if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||
129 parts[2] > 0xff)
130 return (0);
131 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
132 break;
133 }
134
135 if (addr != NULL)
136 addr->s_addr = htonl(val);
137 return (1);
138}
139