1 /* $FreeBSD$ */
2
3 /*
4 * ++Copyright++ 1983, 1990, 1993
5 * -
6 * Copyright (c) 1983, 1990, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
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.
24 *
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
35 * SUCH DAMAGE.
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 * --Copyright--
56 */
57
58 #if !defined(lint)
59 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
60 static const char rcsid[] = "@(#)$Id: inet_addr.c,v 1.8.2.3 2004/12/09 19:41:20 darrenr Exp $";
61 #endif /* LIBC_SCCS and not lint */
62
63 #include <sys/param.h>
64 #include <netinet/in.h>
65 #include <arpa/inet.h>
66 #include <ctype.h>
67
68 #ifndef __P
69 # define __P(x) x
70 #endif
71 int inet_aton(const char *, struct in_addr *);
72
73 /*
74 * Because the ctype(3) posix definition, if used "safely" in code everywhere,
75 * would mean all normal code that walks through strings needed casts. Yuck.
76 */
77 #define ISALNUM(x) isalnum((u_char)(x))
78 #define ISALPHA(x) isalpha((u_char)(x))
79 #define ISASCII(x) isascii((u_char)(x))
80 #define ISDIGIT(x) isdigit((u_char)(x))
81 #define ISPRINT(x) isprint((u_char)(x))
82 #define ISSPACE(x) isspace((u_char)(x))
83 #define ISUPPER(x) isupper((u_char)(x))
84 #define ISXDIGIT(x) isxdigit((u_char)(x))
85 #define ISLOWER(x) islower((u_char)(x))
86
87 /*
88 * Check whether "cp" is a valid ascii representation
89 * of an Internet address and convert to a binary address.
90 * Returns 1 if the address is valid, 0 if not.
91 * This replaces inet_addr, the return value from which
92 * cannot distinguish between failure and a local broadcast address.
93 */
94 int
inet_aton(register const char * cp,struct in_addr * addr)95 inet_aton(register const char *cp, struct in_addr *addr)
96 {
97 register u_long val;
98 register int base, n;
99 register char c;
100 u_int parts[4];
101 register u_int *pp = parts;
102
103 c = *cp;
104 for (;;) {
105 /*
106 * Collect number up to ``.''.
107 * Values are specified as for C:
108 * 0x=hex, 0=octal, isdigit=decimal.
109 */
110 if (!ISDIGIT(c))
111 return (0);
112 val = 0; base = 10;
113 if (c == '0') {
114 c = *++cp;
115 if (c == 'x' || c == 'X')
116 base = 16, c = *++cp;
117 else
118 base = 8;
119 }
120 for (;;) {
121 if (ISASCII(c) && ISDIGIT(c)) {
122 val = (val * base) + (c - '0');
123 c = *++cp;
124 } else if (base == 16 && ISASCII(c) && ISXDIGIT(c)) {
125 val = (val << 4) |
126 (c + 10 - (ISLOWER(c) ? 'a' : 'A'));
127 c = *++cp;
128 } else
129 break;
130 }
131 if (c == '.') {
132 /*
133 * Internet format:
134 * a.b.c.d
135 * a.b.c (with c treated as 16 bits)
136 * a.b (with b treated as 24 bits)
137 */
138 if (pp >= parts + 3)
139 return (0);
140 *pp++ = val;
141 c = *++cp;
142 } else
143 break;
144 }
145 /*
146 * Check for trailing characters.
147 */
148 if (c != '\0' && (!ISASCII(c) || !ISSPACE(c)))
149 return (0);
150 /*
151 * Concoct the address according to
152 * the number of parts specified.
153 */
154 n = pp - parts + 1;
155 switch (n) {
156
157 case 0:
158 return (0); /* initial nondigit */
159
160 case 1: /* a -- 32 bits */
161 break;
162
163 case 2: /* a.b -- 8.24 bits */
164 if (val > 0xffffff)
165 return (0);
166 val |= parts[0] << 24;
167 break;
168
169 case 3: /* a.b.c -- 8.8.16 bits */
170 if (val > 0xffff)
171 return (0);
172 val |= (parts[0] << 24) | (parts[1] << 16);
173 break;
174
175 case 4: /* a.b.c.d -- 8.8.8.8 bits */
176 if (val > 0xff)
177 return (0);
178 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
179 break;
180 }
181 if (addr)
182 addr->s_addr = htonl(val);
183 return (1);
184 }
185
186 /* these are compatibility routines, not needed on recent BSD releases */
187
188 /*
189 * Ascii internet address interpretation routine.
190 * The value returned is in network order.
191 */
192 #if 0
193 inet_addr(const char *cp)
194 {
195 struct in_addr val;
196
197 if (inet_aton(cp, &val))
198 return (val.s_addr);
199 return (0xffffffff);
200 }
201 #endif
202