1/*
2 * Copyright (c) 1983, 1990, 1993
3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
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
50/*
51 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
52 *
53 * Permission to use, copy, modify, and distribute this software for any
54 * purpose with or without fee is hereby granted, provided that the above
55 * copyright notice and this permission notice appear in all copies.
56 *
57 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
58 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
59 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
60 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
61 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
62 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
63 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
64 * SOFTWARE.
65 */
66
67#include <sys/types.h>
68#include <sys/param.h>
69
70#include <netinet/in.h>
71#include <arpa/inet.h>
72
73#include <ctype.h>
74
75#include <endian.h>
76#include <stdint.h>
77#include <stdlib.h>
78#include <limits.h>
79#include <errno.h>
80
81/*
82 * Ascii internet address interpretation routine.
83 * The value returned is in network order.
84 */
85in_addr_t
86__inet_addr(const char *cp) {
87 struct in_addr val;
88
89 if (__inet_aton(cp, &val))
90 return (val.s_addr);
91 return (INADDR_NONE);
92}
93weak_alias (__inet_addr, inet_addr)
94
95/*
96 * Check whether "cp" is a valid ascii representation
97 * of an Internet address and convert to a binary address.
98 * Returns 1 if the address is valid, 0 if not.
99 * This replaces inet_addr, the return value from which
100 * cannot distinguish between failure and a local broadcast address.
101 */
102int
103__inet_aton(const char *cp, struct in_addr *addr)
104{
105 static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
106 in_addr_t val;
107 char c;
108 union iaddr {
109 uint8_t bytes[4];
110 uint32_t word;
111 } res;
112 uint8_t *pp = res.bytes;
113 int digit;
114
115 int saved_errno = errno;
116 __set_errno (0);
117
118 res.word = 0;
119
120 c = *cp;
121 for (;;) {
122 /*
123 * Collect number up to ``.''.
124 * Values are specified as for C:
125 * 0x=hex, 0=octal, isdigit=decimal.
126 */
127 if (!isdigit(c))
128 goto ret_0;
129 {
130 char *endp;
131 unsigned long ul = strtoul (cp, (char **) &endp, 0);
132 if (ul == ULONG_MAX && errno == ERANGE)
133 goto ret_0;
134 if (ul > 0xfffffffful)
135 goto ret_0;
136 val = ul;
137 digit = cp != endp;
138 cp = endp;
139 }
140 c = *cp;
141 if (c == '.') {
142 /*
143 * Internet format:
144 * a.b.c.d
145 * a.b.c (with c treated as 16 bits)
146 * a.b (with b treated as 24 bits)
147 */
148 if (pp > res.bytes + 2 || val > 0xff)
149 goto ret_0;
150 *pp++ = val;
151 c = *++cp;
152 } else
153 break;
154 }
155 /*
156 * Check for trailing characters.
157 */
158 if (c != '\0' && (!isascii(c) || !isspace(c)))
159 goto ret_0;
160 /*
161 * Did we get a valid digit?
162 */
163 if (!digit)
164 goto ret_0;
165
166 /* Check whether the last part is in its limits depending on
167 the number of parts in total. */
168 if (val > max[pp - res.bytes])
169 goto ret_0;
170
171 if (addr != NULL)
172 addr->s_addr = res.word | htonl (val);
173
174 __set_errno (saved_errno);
175 return (1);
176
177ret_0:
178 __set_errno (saved_errno);
179 return (0);
180}
181weak_alias (__inet_aton, inet_aton)
182libc_hidden_def (__inet_aton)
183libc_hidden_weak (inet_aton)
184