1 /* $KAME: inet_addr.c,v 1.5 2001/08/20 02:32:40 itojun 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 #if defined(LIBC_SCCS) && !defined(lint)
59 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
60 static char rcsid[] = "$FreeBSD: src/lib/libc/net/inet_addr.c,v 1.12.2.2 2002/04/28 05:40:24 suz Exp $";
61 #endif /* LIBC_SCCS and not lint */
62
63 #include <sys/param.h>
64
65 #include <netinet/in.h>
66 #include <arpa/inet.h>
67
68 #include <ctype.h>
69 #include <errno.h>
70 #include <string.h>
71 #include <stdlib.h>
72
73 /*
74 * ASCII internet address interpretation routine.
75 * The value returned is in network order.
76 */
77 in_addr_t /* XXX should be struct in_addr :( */
inet_addr(cp)78 inet_addr(cp)
79 register const char *cp;
80 {
81 struct in_addr val;
82
83 if (inet_aton(cp, &val))
84 return (val.s_addr);
85 return (INADDR_NONE);
86 }
87
88 /*
89 * Check whether "cp" is a valid ASCII representation
90 * of an Internet address and convert to a binary address.
91 * Returns 1 if the address is valid, 0 if not.
92 * This replaces inet_addr, the return value from which
93 * cannot distinguish between failure and a local broadcast address.
94 */
95 int
inet_aton(cp,addr)96 inet_aton(cp, addr)
97 register const char *cp;
98 struct in_addr *addr;
99 {
100 u_long parts[4];
101 in_addr_t val;
102 char *c;
103 char *endptr;
104 int gotend, n;
105
106 c = (char *)cp;
107 n = 0;
108 /*
109 * Run through the string, grabbing numbers until
110 * the end of the string, or some error
111 */
112 gotend = 0;
113 while (!gotend) {
114 errno = 0;
115 val = strtoul(c, &endptr, 0);
116
117 if (errno == ERANGE) /* Fail completely if it overflowed. */
118 return (0);
119
120 /*
121 * If the whole string is invalid, endptr will equal
122 * c.. this way we can make sure someone hasn't
123 * gone '.12' or something which would get past
124 * the next check.
125 */
126 if (endptr == c)
127 return (0);
128 parts[n] = val;
129 c = endptr;
130
131 /* Check the next character past the previous number's end */
132 switch (*c) {
133 case '.' :
134 /* Make sure we only do 3 dots .. */
135 if (n == 3) /* Whoops. Quit. */
136 return (0);
137 n++;
138 c++;
139 break;
140
141 case '\0':
142 gotend = 1;
143 break;
144
145 default:
146 if (isspace((unsigned char)*c)) {
147 gotend = 1;
148 break;
149 } else
150 return (0); /* Invalid character, so fail */
151 }
152
153 }
154
155 /*
156 * Concoct the address according to
157 * the number of parts specified.
158 */
159
160 switch (n) {
161 case 0: /* a -- 32 bits */
162 /*
163 * Nothing is necessary here. Overflow checking was
164 * already done in strtoul().
165 */
166 break;
167 case 1: /* a.b -- 8.24 bits */
168 if (val > 0xffffff || parts[0] > 0xff)
169 return (0);
170 val |= parts[0] << 24;
171 break;
172
173 case 2: /* a.b.c -- 8.8.16 bits */
174 if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff)
175 return (0);
176 val |= (parts[0] << 24) | (parts[1] << 16);
177 break;
178
179 case 3: /* a.b.c.d -- 8.8.8.8 bits */
180 if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||
181 parts[2] > 0xff)
182 return (0);
183 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
184 break;
185 }
186
187 if (addr != NULL)
188 addr->s_addr = htonl(val);
189 return (1);
190 }
191
192 /*
193 * Weak aliases for applications that use certain private entry points,
194 * and fail to include <arpa/inet.h>.
195 */
196 #undef inet_addr
197 __weak_reference(__inet_addr, inet_addr);
198 #undef inet_aton
199 __weak_reference(__inet_aton, inet_aton);
200