1 /* $OpenBSD: inet_addr.c,v 1.9 2005/08/06 20:30:03 espie Exp $ */
2
3 /*
4 * Copyright (c) 1983, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 * -
31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
32 *
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies, and that
36 * the name of Digital Equipment Corporation not be used in advertising or
37 * publicity pertaining to distribution of the document or software without
38 * specific, written prior permission.
39 *
40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
47 * SOFTWARE.
48 * -
49 * --Copyright--
50 */
51
52 /* OPENBSD ORIGINAL: lib/libc/net/inet_addr.c */
53
54 #include "includes.h"
55
56 #if !defined(HAVE_INET_ATON)
57
58 #include <sys/types.h>
59 #include <netinet/in.h>
60 #include <arpa/inet.h>
61 #include <ctype.h>
62
63 #if 0
64 /*
65 * Ascii internet address interpretation routine.
66 * The value returned is in network order.
67 */
68 in_addr_t
69 inet_addr(const char *cp)
70 {
71 struct in_addr val;
72
73 if (inet_aton(cp, &val))
74 return (val.s_addr);
75 return (INADDR_NONE);
76 }
77 #endif
78
79 /*
80 * Check whether "cp" is a valid ascii representation
81 * of an Internet address and convert to a binary address.
82 * Returns 1 if the address is valid, 0 if not.
83 * This replaces inet_addr, the return value from which
84 * cannot distinguish between failure and a local broadcast address.
85 */
86 int
inet_aton(const char * cp,struct in_addr * addr)87 inet_aton(const char *cp, struct in_addr *addr)
88 {
89 u_int32_t val;
90 int base, n;
91 char c;
92 u_int parts[4];
93 u_int *pp = parts;
94
95 c = *cp;
96 for (;;) {
97 /*
98 * Collect number up to ``.''.
99 * Values are specified as for C:
100 * 0x=hex, 0=octal, isdigit=decimal.
101 */
102 if (!isdigit(c))
103 return (0);
104 val = 0; base = 10;
105 if (c == '0') {
106 c = *++cp;
107 if (c == 'x' || c == 'X')
108 base = 16, c = *++cp;
109 else
110 base = 8;
111 }
112 for (;;) {
113 if (isascii(c) && isdigit(c)) {
114 val = (val * base) + (c - '0');
115 c = *++cp;
116 } else if (base == 16 && isascii(c) && isxdigit(c)) {
117 val = (val << 4) |
118 (c + 10 - (islower(c) ? 'a' : 'A'));
119 c = *++cp;
120 } else
121 break;
122 }
123 if (c == '.') {
124 /*
125 * Internet format:
126 * a.b.c.d
127 * a.b.c (with c treated as 16 bits)
128 * a.b (with b treated as 24 bits)
129 */
130 if (pp >= parts + 3)
131 return (0);
132 *pp++ = val;
133 c = *++cp;
134 } else
135 break;
136 }
137 /*
138 * Check for trailing characters.
139 */
140 if (c != '\0' && (!isascii(c) || !isspace(c)))
141 return (0);
142 /*
143 * Concoct the address according to
144 * the number of parts specified.
145 */
146 n = pp - parts + 1;
147 switch (n) {
148
149 case 0:
150 return (0); /* initial nondigit */
151
152 case 1: /* a -- 32 bits */
153 break;
154
155 case 2: /* a.b -- 8.24 bits */
156 if ((val > 0xffffff) || (parts[0] > 0xff))
157 return (0);
158 val |= parts[0] << 24;
159 break;
160
161 case 3: /* a.b.c -- 8.8.16 bits */
162 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
163 return (0);
164 val |= (parts[0] << 24) | (parts[1] << 16);
165 break;
166
167 case 4: /* a.b.c.d -- 8.8.8.8 bits */
168 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
169 return (0);
170 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
171 break;
172 }
173 if (addr)
174 addr->s_addr = htonl(val);
175 return (1);
176 }
177
178 #endif /* !defined(HAVE_INET_ATON) */
179