1 /* $NetBSD: inet_addr.c,v 1.4 2018/07/26 00:20:41 kamil Exp $ */
2
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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
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
56 /*
57 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
58 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
59 *
60 * Permission to use, copy, modify, and distribute this software for any
61 * purpose with or without fee is hereby granted, provided that the above
62 * copyright notice and this permission notice appear in all copies.
63 *
64 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
65 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
66 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
67 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
69 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
70 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
71 */
72
73 #if !defined(_KERNEL) && !defined(_STANDALONE)
74 #include <sys/cdefs.h>
75 #if defined(LIBC_SCCS) && !defined(lint)
76 #if 0
77 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
78 static const char rcsid[] = "Id: inet_addr.c,v 1.2.206.2 2004/03/17 00:29:45 marka Exp";
79 #else
80 __RCSID("$NetBSD: inet_addr.c,v 1.4 2018/07/26 00:20:41 kamil Exp $");
81 #endif
82 #endif /* LIBC_SCCS and not lint */
83
84 #include "port_before.h"
85
86 #include "namespace.h"
87 #include <sys/types.h>
88 #include <sys/param.h>
89
90 #include <netinet/in.h>
91 #include <arpa/inet.h>
92
93 #include <ctype.h>
94
95 #include "port_after.h"
96
97 #ifdef __weak_alias
__weak_alias(inet_aton,_inet_aton)98 __weak_alias(inet_aton,_inet_aton)
99 #endif
100 #else
101 #include <lib/libkern/libkern.h>
102 #include <netinet/in.h>
103 #endif
104
105 /*
106 * Ascii internet address interpretation routine.
107 * The value returned is in network order.
108 */
109 uint32_t
110 inet_addr(const char *cp) {
111 struct in_addr val;
112
113 if (inet_aton(cp, &val))
114 return (val.s_addr);
115 return (INADDR_NONE);
116 }
117
118 /*
119 * Check whether "cp" is a valid ascii representation
120 * of an Internet address and convert to a binary address.
121 * Returns 1 if the address is valid, 0 if not.
122 * This replaces inet_addr, the return value from which
123 * cannot distinguish between failure and a local broadcast address.
124 */
125 int
inet_aton(const char * cp,struct in_addr * addr)126 inet_aton(const char *cp, struct in_addr *addr) {
127 uint32_t val;
128 int base;
129 size_t n;
130 char c;
131 uint8_t parts[4];
132 uint8_t *pp = parts;
133 int digit;
134
135 c = *cp;
136 for (;;) {
137 /*
138 * Collect number up to ``.''.
139 * Values are specified as for C:
140 * 0x=hex, 0=octal, isdigit=decimal.
141 */
142 if (!isdigit((unsigned char)c))
143 return (0);
144 val = 0; base = 10; digit = 0;
145 if (c == '0') {
146 c = *++cp;
147 if (c == 'x' || c == 'X')
148 base = 16, c = *++cp;
149 else {
150 base = 8;
151 digit = 1 ;
152 }
153 }
154 for (;;) {
155 if (isascii(c) && isdigit((unsigned char)c)) {
156 if (base == 8 && (c == '8' || c == '9'))
157 return (0);
158 val = (val * base) + (c - '0');
159 c = *++cp;
160 digit = 1;
161 } else if (base == 16 && isascii(c) &&
162 isxdigit((unsigned char)c)) {
163 val = (val << 4) |
164 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
165 c = *++cp;
166 digit = 1;
167 } else
168 break;
169 }
170 if (c == '.') {
171 /*
172 * Internet format:
173 * a.b.c.d
174 * a.b.c (with c treated as 16 bits)
175 * a.b (with b treated as 24 bits)
176 */
177 if (pp >= parts + 3 || val > 0xffU)
178 return (0);
179 *pp++ = val;
180 c = *++cp;
181 } else
182 break;
183 }
184 /*
185 * Check for trailing characters.
186 */
187 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
188 return (0);
189 /*
190 * Did we get a valid digit?
191 */
192 if (!digit)
193 return (0);
194 /*
195 * Concoct the address according to
196 * the number of parts specified.
197 */
198 n = pp - parts + 1;
199 switch (n) {
200 case 1: /* a -- 32 bits */
201 break;
202
203 case 2: /* a.b -- 8.24 bits */
204 if (val > 0xffffffU)
205 return (0);
206 val |= (uint32_t)parts[0] << 24;
207 break;
208
209 case 3: /* a.b.c -- 8.8.16 bits */
210 if (val > 0xffffU)
211 return (0);
212 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16);
213 break;
214
215 case 4: /* a.b.c.d -- 8.8.8.8 bits */
216 if (val > 0xffU)
217 return (0);
218 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16) |
219 (parts[2] << 8);
220 break;
221 }
222 if (addr != NULL)
223 addr->s_addr = htonl(val);
224 return (1);
225 }
226