blob: 130597e147c78ae098d8f45c10d992003a003b8c [file] [log] [blame]
Darren Tuckerc7e05d62005-11-10 17:21:21 +11001/* $OpenBSD: inet_addr.c,v 1.9 2005/08/06 20:30:03 espie Exp $ */
Tim Rice2db53712001-07-15 19:07:49 -07002
3/*
Tim Rice2db53712001-07-15 19:07:49 -07004 * 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.
Damien Miller329638e2003-06-03 12:12:50 +100015 * 3. Neither the name of the University nor the names of its contributors
Tim Rice2db53712001-07-15 19:07:49 -070016 * 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
Darren Tucker7f24a0e2005-11-10 16:18:56 +110052/* OPENBSD ORIGINAL: lib/libc/net/inet_addr.c */
53
Tim Rice813f0452002-04-11 20:35:39 -070054#include "includes.h"
Tim Rice2db53712001-07-15 19:07:49 -070055
56#if !defined(HAVE_INET_ATON)
57
Tim Rice2db53712001-07-15 19:07:49 -070058#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#if 0
65/*
66 * Ascii internet address interpretation routine.
67 * The value returned is in network order.
68 */
69in_addr_t
Darren Tuckerc7e05d62005-11-10 17:21:21 +110070inet_addr(const char *cp)
Tim Rice2db53712001-07-15 19:07:49 -070071{
72 struct in_addr val;
73
74 if (inet_aton(cp, &val))
75 return (val.s_addr);
76 return (INADDR_NONE);
77}
78#endif
79
80/*
81 * Check whether "cp" is a valid ascii representation
82 * of an Internet address and convert to a binary address.
83 * Returns 1 if the address is valid, 0 if not.
84 * This replaces inet_addr, the return value from which
85 * cannot distinguish between failure and a local broadcast address.
86 */
87int
88inet_aton(const char *cp, struct in_addr *addr)
89{
Darren Tuckerc7e05d62005-11-10 17:21:21 +110090 u_int32_t val;
91 int base, n;
92 char c;
93 u_int parts[4];
94 u_int *pp = parts;
Tim Rice2db53712001-07-15 19:07:49 -070095
96 c = *cp;
97 for (;;) {
98 /*
99 * Collect number up to ``.''.
100 * Values are specified as for C:
101 * 0x=hex, 0=octal, isdigit=decimal.
102 */
103 if (!isdigit(c))
104 return (0);
105 val = 0; base = 10;
106 if (c == '0') {
107 c = *++cp;
108 if (c == 'x' || c == 'X')
109 base = 16, c = *++cp;
110 else
111 base = 8;
112 }
113 for (;;) {
114 if (isascii(c) && isdigit(c)) {
115 val = (val * base) + (c - '0');
116 c = *++cp;
117 } else if (base == 16 && isascii(c) && isxdigit(c)) {
118 val = (val << 4) |
119 (c + 10 - (islower(c) ? 'a' : 'A'));
120 c = *++cp;
121 } else
122 break;
123 }
124 if (c == '.') {
125 /*
126 * Internet format:
127 * a.b.c.d
128 * a.b.c (with c treated as 16 bits)
129 * a.b (with b treated as 24 bits)
130 */
131 if (pp >= parts + 3)
132 return (0);
133 *pp++ = val;
134 c = *++cp;
135 } else
136 break;
137 }
138 /*
139 * Check for trailing characters.
140 */
141 if (c != '\0' && (!isascii(c) || !isspace(c)))
142 return (0);
143 /*
144 * Concoct the address according to
145 * the number of parts specified.
146 */
147 n = pp - parts + 1;
148 switch (n) {
149
150 case 0:
151 return (0); /* initial nondigit */
152
153 case 1: /* a -- 32 bits */
154 break;
155
156 case 2: /* a.b -- 8.24 bits */
157 if ((val > 0xffffff) || (parts[0] > 0xff))
158 return (0);
159 val |= parts[0] << 24;
160 break;
161
162 case 3: /* a.b.c -- 8.8.16 bits */
163 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
164 return (0);
165 val |= (parts[0] << 24) | (parts[1] << 16);
166 break;
167
168 case 4: /* a.b.c.d -- 8.8.8.8 bits */
169 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
170 return (0);
171 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
172 break;
173 }
174 if (addr)
175 addr->s_addr = htonl(val);
176 return (1);
177}
178
179#endif /* !defined(HAVE_INET_ATON) */