1 /*-
2 * SPDX-License-Identifier: (BSD-3-Clause AND ISC)
3 *
4 * 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.
15 * 3. Neither the name of the University nor the names of its contributors
16 * 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
32 /*
33 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
34 *
35 * Permission to use, copy, modify, and distribute this software for any
36 * purpose with or without fee is hereby granted, provided that the above
37 * copyright notice and this permission notice appear in all copies, and that
38 * the name of Digital Equipment Corporation not be used in advertising or
39 * publicity pertaining to distribution of the document or software without
40 * specific, written prior permission.
41 *
42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
49 * SOFTWARE.
50 */
51
52 /*
53 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
54 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
55 *
56 * Permission to use, copy, modify, and distribute this software for any
57 * purpose with or without fee is hereby granted, provided that the above
58 * copyright notice and this permission notice appear in all copies.
59 *
60 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
61 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
62 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
63 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
64 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
65 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
66 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
67 */
68
69 #if defined(LIBC_SCCS) && !defined(lint)
70 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
71 static const char rcsid[] = "$Id: inet_addr.c,v 1.5 2005/04/27 04:56:19 sra Exp $";
72 #endif /* LIBC_SCCS and not lint */
73 #include "port_before.h"
74
75 #include <sys/param.h>
76
77 #include <netinet/in.h>
78 #include <arpa/inet.h>
79
80 #include <ctype.h>
81
82 #include "port_after.h"
83
84 /*%
85 * Ascii internet address interpretation routine.
86 * The value returned is in network order.
87 */
88 in_addr_t /* XXX should be struct in_addr :( */
inet_addr(const char * cp)89 inet_addr(const char *cp) {
90 struct in_addr val;
91
92 if (inet_aton(cp, &val))
93 return (val.s_addr);
94 return (INADDR_NONE);
95 }
96
97 /*%
98 * Check whether "cp" is a valid ascii representation
99 * of an Internet address and convert to a binary address.
100 * Returns 1 if the address is valid, 0 if not.
101 * This replaces inet_addr, the return value from which
102 * cannot distinguish between failure and a local broadcast address.
103 */
104 int
inet_aton(const char * cp,struct in_addr * addr)105 inet_aton(const char *cp, struct in_addr *addr) {
106 u_long val;
107 int base, n;
108 char c;
109 u_int8_t parts[4];
110 u_int8_t *pp = parts;
111 int digit;
112
113 c = *cp;
114 for (;;) {
115 /*
116 * Collect number up to ``.''.
117 * Values are specified as for C:
118 * 0x=hex, 0=octal, isdigit=decimal.
119 */
120 if (!isdigit((unsigned char)c))
121 return (0);
122 val = 0; base = 10; digit = 0;
123 if (c == '0') {
124 c = *++cp;
125 if (c == 'x' || c == 'X')
126 base = 16, c = *++cp;
127 else {
128 base = 8;
129 digit = 1 ;
130 }
131 }
132 for (;;) {
133 if (isascii(c) && isdigit((unsigned char)c)) {
134 if (base == 8 && (c == '8' || c == '9'))
135 return (0);
136 val = (val * base) + (c - '0');
137 c = *++cp;
138 digit = 1;
139 } else if (base == 16 && isascii(c) &&
140 isxdigit((unsigned char)c)) {
141 val = (val << 4) |
142 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
143 c = *++cp;
144 digit = 1;
145 } else
146 break;
147 }
148 if (c == '.') {
149 /*
150 * Internet format:
151 * a.b.c.d
152 * a.b.c (with c treated as 16 bits)
153 * a.b (with b treated as 24 bits)
154 */
155 if (pp >= parts + 3 || val > 0xffU)
156 return (0);
157 *pp++ = val;
158 c = *++cp;
159 } else
160 break;
161 }
162 /*
163 * Check for trailing characters.
164 */
165 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
166 return (0);
167 /*
168 * Did we get a valid digit?
169 */
170 if (!digit)
171 return (0);
172 /*
173 * Concoct the address according to
174 * the number of parts specified.
175 */
176 n = pp - parts + 1;
177 switch (n) {
178 case 1: /*%< a -- 32 bits */
179 break;
180
181 case 2: /*%< a.b -- 8.24 bits */
182 if (val > 0xffffffU)
183 return (0);
184 val |= (uint32_t)parts[0] << 24;
185 break;
186
187 case 3: /*%< a.b.c -- 8.8.16 bits */
188 if (val > 0xffffU)
189 return (0);
190 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16);
191 break;
192
193 case 4: /*%< a.b.c.d -- 8.8.8.8 bits */
194 if (val > 0xffU)
195 return (0);
196 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16) |
197 (parts[2] << 8);
198 break;
199 }
200 if (addr != NULL)
201 addr->s_addr = htonl(val);
202 return (1);
203 }
204
205 /*
206 * Weak aliases for applications that use certain private entry points,
207 * and fail to include <arpa/inet.h>.
208 */
209 #undef inet_addr
210 __weak_reference(__inet_addr, inet_addr);
211 #undef inet_aton
212 __weak_reference(__inet_aton, inet_aton);
213
214 /*! \file */
215