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1 /* $OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $ */
2
3 /*
4 * ++Copyright++ 1983, 1990, 1993
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. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 * -
37 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
38 *
39 * Permission to use, copy, modify, and distribute this software for any
40 * purpose with or without fee is hereby granted, provided that the above
41 * copyright notice and this permission notice appear in all copies, and that
42 * the name of Digital Equipment Corporation not be used in advertising or
43 * publicity pertaining to distribution of the document or software without
44 * specific, written prior permission.
45 *
46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
53 * SOFTWARE.
54 * -
55 * --Copyright--
56 */
57
58 #include <sys/types.h>
59 #include <sys/param.h>
60 #include <netinet/in.h>
61 #include <arpa/inet.h>
62 #include <ctype.h>
63
64 #include "config.h"
65 /*
66 * Check whether "cp" is a valid ascii representation
67 * of an Internet address and convert to a binary address.
68 * Returns 1 if the address is valid, 0 if not.
69 * This replaces inet_addr, the return value from which
70 * cannot distinguish between failure and a local broadcast address.
71 */
72 int
73 inet_aton(const char *cp, struct in_addr *addr)
74 {
75 register u_int32_t val;
76 register int base, n;
77 register char c;
78 unsigned int parts[4];
79 register unsigned int *pp = parts;
80
81 c = *cp;
82 for (;;) {
83 /*
84 * Collect number up to ``.''.
85 * Values are specified as for C:
86 * 0x=hex, 0=octal, isdigit=decimal.
87 */
88 if (!isdigit(c))
89 return (0);
90 val = 0; base = 10;
91 if (c == '0') {
92 c = *++cp;
93 if (c == 'x' || c == 'X')
94 base = 16, c = *++cp;
95 else
96 base = 8;
97 }
98 for (;;) {
99 if (isascii(c) && isdigit(c)) {
100 val = (val * base) + (c - '0');
101 c = *++cp;
102 } else if (base == 16 && isascii(c) && isxdigit(c)) {
103 val = (val << 4) |
104 (c + 10 - (islower(c) ? 'a' : 'A'));
105 c = *++cp;
106 } else
107 break;
108 }
109 if (c == '.') {
110 /*
111 * Internet format:
112 * a.b.c.d
113 * a.b.c (with c treated as 16 bits)
114 * a.b (with b treated as 24 bits)
115 */
116 if (pp >= parts + 3)
117 return (0);
118 *pp++ = val;
119 c = *++cp;
120 } else
121 break;
122 }
123 /*
124 * Check for trailing characters.
125 */
126 if (c != '\0' && (!isascii(c) || !isspace(c)))
127 return (0);
128 /*
129 * Concoct the address according to
130 * the number of parts specified.
131 */
132 n = pp - parts + 1;
133 switch (n) {
134
135 case 0:
136 return (0); /* initial nondigit */
137
138 case 1: /* a -- 32 bits */
139 break;
140
141 case 2: /* a.b -- 8.24 bits */
142 if ((val > 0xffffff) || (parts[0] > 0xff))
143 return (0);
144 val |= parts[0] << 24;
145 break;
146
147 case 3: /* a.b.c -- 8.8.16 bits */
148 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
149 return (0);
150 val |= (parts[0] << 24) | (parts[1] << 16);
151 break;
152
153 case 4: /* a.b.c.d -- 8.8.8.8 bits */
154 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
155 return (0);
156 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
157 break;
158 }
159 if (addr)
160 addr->s_addr = htonl(val);
161 return (1);
162 }