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 #include "port_before.h"
70
71 #include <sys/param.h>
72
73 #include <netinet/in.h>
74 #include <arpa/inet.h>
75
76 #include <ctype.h>
77
78 #include "port_after.h"
79
80 /*%
81 * Ascii internet address interpretation routine.
82 * The value returned is in network order.
83 */
84 in_addr_t /* XXX should be struct in_addr :( */
inet_addr(const char * cp)85 inet_addr(const char *cp) {
86 struct in_addr val;
87
88 if (inet_aton(cp, &val))
89 return (val.s_addr);
90 return (INADDR_NONE);
91 }
92
93 /*%
94 * Check whether "cp" is a valid ascii representation
95 * of an Internet address and convert to a binary address.
96 * Returns 1 if the address is valid, 0 if not.
97 * This replaces inet_addr, the return value from which
98 * cannot distinguish between failure and a local broadcast address.
99 */
100 int
inet_aton(const char * cp,struct in_addr * addr)101 inet_aton(const char *cp, struct in_addr *addr) {
102 u_long val;
103 int base, n;
104 char c;
105 u_int8_t parts[4];
106 u_int8_t *pp = parts;
107 int digit;
108
109 c = *cp;
110 for (;;) {
111 /*
112 * Collect number up to ``.''.
113 * Values are specified as for C:
114 * 0x=hex, 0=octal, isdigit=decimal.
115 */
116 if (!isdigit((unsigned char)c))
117 return (0);
118 val = 0; base = 10; digit = 0;
119 if (c == '0') {
120 c = *++cp;
121 if (c == 'x' || c == 'X')
122 base = 16, c = *++cp;
123 else {
124 base = 8;
125 digit = 1 ;
126 }
127 }
128 for (;;) {
129 if (isascii(c) && isdigit((unsigned char)c)) {
130 if (base == 8 && (c == '8' || c == '9'))
131 return (0);
132 val = (val * base) + (c - '0');
133 c = *++cp;
134 digit = 1;
135 } else if (base == 16 && isascii(c) &&
136 isxdigit((unsigned char)c)) {
137 val = (val << 4) |
138 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
139 c = *++cp;
140 digit = 1;
141 } else
142 break;
143 }
144 if (c == '.') {
145 /*
146 * Internet format:
147 * a.b.c.d
148 * a.b.c (with c treated as 16 bits)
149 * a.b (with b treated as 24 bits)
150 */
151 if (pp >= parts + 3 || val > 0xffU)
152 return (0);
153 *pp++ = val;
154 c = *++cp;
155 } else
156 break;
157 }
158 /*
159 * Check for trailing characters.
160 */
161 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
162 return (0);
163 /*
164 * Did we get a valid digit?
165 */
166 if (!digit)
167 return (0);
168 /*
169 * Concoct the address according to
170 * the number of parts specified.
171 */
172 n = pp - parts + 1;
173 switch (n) {
174 case 1: /*%< a -- 32 bits */
175 break;
176
177 case 2: /*%< a.b -- 8.24 bits */
178 if (val > 0xffffffU)
179 return (0);
180 val |= (uint32_t)parts[0] << 24;
181 break;
182
183 case 3: /*%< a.b.c -- 8.8.16 bits */
184 if (val > 0xffffU)
185 return (0);
186 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16);
187 break;
188
189 case 4: /*%< a.b.c.d -- 8.8.8.8 bits */
190 if (val > 0xffU)
191 return (0);
192 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16) |
193 (parts[2] << 8);
194 break;
195 }
196 if (addr != NULL)
197 addr->s_addr = htonl(val);
198 return (1);
199 }
200
201 /*
202 * Weak aliases for applications that use certain private entry points,
203 * and fail to include <arpa/inet.h>.
204 */
205 #undef inet_addr
206 __weak_reference(__inet_addr, inet_addr);
207 #undef inet_aton
208 __weak_reference(__inet_aton, inet_aton);
209
210 /*! \file */
211