1 /* $KAME: inet_addr.c,v 1.5 2001/08/20 02:32:40 itojun Exp $ */
4 * ++Copyright++ 1983, 1990, 1993
6 * Copyright (c) 1983, 1990, 1993
7 * The Regents of the University of California. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
37 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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.
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
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 */
63 #include <sys/param.h>
65 #include <netinet/in.h>
66 #include <arpa/inet.h>
74 * ASCII internet address interpretation routine.
75 * The value returned is in network order.
77 in_addr_t /* XXX should be struct in_addr :( */
79 register const char *cp;
83 if (inet_aton(cp, &val))
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.
97 register const char *cp;
109 * Run through the string, grabbing numbers until
110 * the end of the string, or some error
115 val = strtoul(c, &endptr, 0);
117 if (errno == ERANGE) /* Fail completely if it overflowed. */
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
131 /* Check the next character past the previous number's end */
134 /* Make sure we only do 3 dots .. */
135 if (n == 3) /* Whoops. Quit. */
146 if (isspace((unsigned char)*c)) {
150 return (0); /* Invalid character, so fail */
156 * Concoct the address according to
157 * the number of parts specified.
161 case 0: /* a -- 32 bits */
163 * Nothing is necessary here. Overflow checking was
164 * already done in strtoul().
167 case 1: /* a.b -- 8.24 bits */
168 if (val > 0xffffff || parts[0] > 0xff)
170 val |= parts[0] << 24;
173 case 2: /* a.b.c -- 8.8.16 bits */
174 if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff)
176 val |= (parts[0] << 24) | (parts[1] << 16);
179 case 3: /* a.b.c.d -- 8.8.8.8 bits */
180 if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||
183 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
188 addr->s_addr = htonl(val);
193 * Weak aliases for applications that use certain private entry points,
194 * and fail to include <arpa/inet.h>.
197 __weak_reference(__inet_addr, inet_addr);
199 __weak_reference(__inet_aton, inet_aton);