1 /*-
2 * Copyright (c) 2001 Charles Mott <[email protected]>
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
33 static inline int
isspace(char c)34 isspace(char c)
35 {
36 return c == ' ' || c == '\t' || c == '\n' || c == '\12';
37 }
38 #endif
39
40 int
inet_aton(const char * cp,struct in_addr * addr)41 inet_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
66 val = (in_addr_t)l;
67
68 /*
69 * If the whole string is invalid, endptr will equal
70 * c.. this way we can make sure someone hasn't
71 * gone '.12' or something which would get past
72 * the next check.
73 */
74 if (endptr == c) {
75 return 0;
76 }
77 parts[n] = val;
78 c = endptr;
79
80 /* Check the next character past the previous number's end */
81 switch (*c) {
82 case '.':
83
84 /* Make sure we only do 3 dots .. */
85 if (n == 3) { /* Whoops. Quit. */
86 return 0;
87 }
88 n++;
89 c++;
90 break;
91
92 case '\0':
93 gotend = 1;
94 break;
95
96 default:
97 if (isspace((unsigned char)*c)) {
98 gotend = 1;
99 break;
100 } else {
101 /* Invalid character, then fail. */
102 return 0;
103 }
104 }
105 }
106
107 /* Concoct the address according to the number of parts specified. */
108 switch (n) {
109 case 0: /* a -- 32 bits */
110
111 /*
112 * Nothing is necessary here. Overflow checking was
113 * already done in strtoul().
114 */
115 break;
116 case 1: /* a.b -- 8.24 bits */
117 if (val > 0xffffff || parts[0] > 0xff) {
118 return 0;
119 }
120 val |= parts[0] << 24;
121 break;
122
123 case 2: /* a.b.c -- 8.8.16 bits */
124 if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff) {
125 return 0;
126 }
127 val |= (parts[0] << 24) | (parts[1] << 16);
128 break;
129
130 case 3: /* a.b.c.d -- 8.8.8.8 bits */
131 if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||
132 parts[2] > 0xff) {
133 return 0;
134 }
135 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
136 break;
137 }
138
139 if (addr != NULL) {
140 addr->s_addr = htonl(val);
141 }
142 return 1;
143 }
144