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 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
52 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
53 *
54 * Permission to use, copy, modify, and distribute this software for any
55 * purpose with or without fee is hereby granted, provided that the above
56 * copyright notice and this permission notice appear in all copies.
57 *
58 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
59 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
60 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
61 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
62 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
63 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
64 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
65 */
66
67 #if defined(LIBC_SCCS) && !defined(lint)
68 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
69 static const char rcsid[] = "$Id: inet_addr.c,v 1.5 2005/04/27 04:56:19 sra Exp $";
70 #endif /* LIBC_SCCS and not lint */
71 #include <sys/cdefs.h>
72 __FBSDID("$FreeBSD$");
73
74 #include "port_before.h"
75
76 #include <sys/param.h>
77
78 #include <netinet/in.h>
79 #include <arpa/inet.h>
80
81 #include <ctype.h>
82
83 #include "port_after.h"
84
85 /*%
86 * Ascii internet address interpretation routine.
87 * The value returned is in network order.
88 */
89 in_addr_t /* XXX should be struct in_addr :( */
inet_addr(const char * cp)90 inet_addr(const char *cp) {
91 struct in_addr val;
92
93 if (inet_aton(cp, &val))
94 return (val.s_addr);
95 return (INADDR_NONE);
96 }
97
98 /*%
99 * Check whether "cp" is a valid ascii representation
100 * of an Internet address and convert to a binary address.
101 * Returns 1 if the address is valid, 0 if not.
102 * This replaces inet_addr, the return value from which
103 * cannot distinguish between failure and a local broadcast address.
104 */
105 int
inet_aton(const char * cp,struct in_addr * addr)106 inet_aton(const char *cp, struct in_addr *addr) {
107 u_long val;
108 int base, n;
109 char c;
110 u_int8_t parts[4];
111 u_int8_t *pp = parts;
112 int digit;
113
114 c = *cp;
115 for (;;) {
116 /*
117 * Collect number up to ``.''.
118 * Values are specified as for C:
119 * 0x=hex, 0=octal, isdigit=decimal.
120 */
121 if (!isdigit((unsigned char)c))
122 return (0);
123 val = 0; base = 10; digit = 0;
124 if (c == '0') {
125 c = *++cp;
126 if (c == 'x' || c == 'X')
127 base = 16, c = *++cp;
128 else {
129 base = 8;
130 digit = 1 ;
131 }
132 }
133 for (;;) {
134 if (isascii(c) && isdigit((unsigned char)c)) {
135 if (base == 8 && (c == '8' || c == '9'))
136 return (0);
137 val = (val * base) + (c - '0');
138 c = *++cp;
139 digit = 1;
140 } else if (base == 16 && isascii(c) &&
141 isxdigit((unsigned char)c)) {
142 val = (val << 4) |
143 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
144 c = *++cp;
145 digit = 1;
146 } else
147 break;
148 }
149 if (c == '.') {
150 /*
151 * Internet format:
152 * a.b.c.d
153 * a.b.c (with c treated as 16 bits)
154 * a.b (with b treated as 24 bits)
155 */
156 if (pp >= parts + 3 || val > 0xffU)
157 return (0);
158 *pp++ = val;
159 c = *++cp;
160 } else
161 break;
162 }
163 /*
164 * Check for trailing characters.
165 */
166 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
167 return (0);
168 /*
169 * Did we get a valid digit?
170 */
171 if (!digit)
172 return (0);
173 /*
174 * Concoct the address according to
175 * the number of parts specified.
176 */
177 n = pp - parts + 1;
178 switch (n) {
179 case 1: /*%< a -- 32 bits */
180 break;
181
182 case 2: /*%< a.b -- 8.24 bits */
183 if (val > 0xffffffU)
184 return (0);
185 val |= (uint32_t)parts[0] << 24;
186 break;
187
188 case 3: /*%< a.b.c -- 8.8.16 bits */
189 if (val > 0xffffU)
190 return (0);
191 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16);
192 break;
193
194 case 4: /*%< a.b.c.d -- 8.8.8.8 bits */
195 if (val > 0xffU)
196 return (0);
197 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16) |
198 (parts[2] << 8);
199 break;
200 }
201 if (addr != NULL)
202 addr->s_addr = htonl(val);
203 return (1);
204 }
205
206 /*
207 * Weak aliases for applications that use certain private entry points,
208 * and fail to include <arpa/inet.h>.
209 */
210 #undef inet_addr
211 __weak_reference(__inet_addr, inet_addr);
212 #undef inet_aton
213 __weak_reference(__inet_aton, inet_aton);
214
215 /*! \file */
216