1
2 /*
3 * ++Copyright++ 1983, 1990, 1993
4 * -
5 * Copyright (c) 1983, 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 * -
36 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
37 *
38 * Permission to use, copy, modify, and distribute this software for any
39 * purpose with or without fee is hereby granted, provided that the above
40 * copyright notice and this permission notice appear in all copies, and that
41 * the name of Digital Equipment Corporation not be used in advertising or
42 * publicity pertaining to distribution of the document or software without
43 * specific, written prior permission.
44 *
45 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
46 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
47 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
48 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
49 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
50 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
51 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
52 * SOFTWARE.
53 * -
54 * --Copyright--
55 */
56
57 #if !defined(lint)
58 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
59 static const char rcsid[] = "@(#)$Id: inet_addr.c,v 1.8.2.3 2004/12/09 19:41:20 darrenr Exp $";
60 #endif /* LIBC_SCCS and not lint */
61
62 #include <sys/param.h>
63 #include <netinet/in.h>
64 #include <arpa/inet.h>
65 #include <ctype.h>
66
67 #ifndef __P
68 # define __P(x) x
69 #endif
70 int inet_aton(const char *, struct in_addr *);
71
72 /*
73 * Because the ctype(3) posix definition, if used "safely" in code everywhere,
74 * would mean all normal code that walks through strings needed casts. Yuck.
75 */
76 #define ISALNUM(x) isalnum((u_char)(x))
77 #define ISALPHA(x) isalpha((u_char)(x))
78 #define ISASCII(x) isascii((u_char)(x))
79 #define ISDIGIT(x) isdigit((u_char)(x))
80 #define ISPRINT(x) isprint((u_char)(x))
81 #define ISSPACE(x) isspace((u_char)(x))
82 #define ISUPPER(x) isupper((u_char)(x))
83 #define ISXDIGIT(x) isxdigit((u_char)(x))
84 #define ISLOWER(x) islower((u_char)(x))
85
86 /*
87 * Check whether "cp" is a valid ascii representation
88 * of an Internet address and convert to a binary address.
89 * Returns 1 if the address is valid, 0 if not.
90 * This replaces inet_addr, the return value from which
91 * cannot distinguish between failure and a local broadcast address.
92 */
93 int
inet_aton(register const char * cp,struct in_addr * addr)94 inet_aton(register const char *cp, struct in_addr *addr)
95 {
96 register u_long val;
97 register int base, n;
98 register char c;
99 u_int parts[4];
100 register u_int *pp = parts;
101
102 c = *cp;
103 for (;;) {
104 /*
105 * Collect number up to ``.''.
106 * Values are specified as for C:
107 * 0x=hex, 0=octal, isdigit=decimal.
108 */
109 if (!ISDIGIT(c))
110 return (0);
111 val = 0; base = 10;
112 if (c == '0') {
113 c = *++cp;
114 if (c == 'x' || c == 'X')
115 base = 16, c = *++cp;
116 else
117 base = 8;
118 }
119 for (;;) {
120 if (ISASCII(c) && ISDIGIT(c)) {
121 val = (val * base) + (c - '0');
122 c = *++cp;
123 } else if (base == 16 && ISASCII(c) && ISXDIGIT(c)) {
124 val = (val << 4) |
125 (c + 10 - (ISLOWER(c) ? 'a' : 'A'));
126 c = *++cp;
127 } else
128 break;
129 }
130 if (c == '.') {
131 /*
132 * Internet format:
133 * a.b.c.d
134 * a.b.c (with c treated as 16 bits)
135 * a.b (with b treated as 24 bits)
136 */
137 if (pp >= parts + 3)
138 return (0);
139 *pp++ = val;
140 c = *++cp;
141 } else
142 break;
143 }
144 /*
145 * Check for trailing characters.
146 */
147 if (c != '\0' && (!ISASCII(c) || !ISSPACE(c)))
148 return (0);
149 /*
150 * Concoct the address according to
151 * the number of parts specified.
152 */
153 n = pp - parts + 1;
154 switch (n) {
155
156 case 0:
157 return (0); /* initial nondigit */
158
159 case 1: /* a -- 32 bits */
160 break;
161
162 case 2: /* a.b -- 8.24 bits */
163 if (val > 0xffffff)
164 return (0);
165 val |= parts[0] << 24;
166 break;
167
168 case 3: /* a.b.c -- 8.8.16 bits */
169 if (val > 0xffff)
170 return (0);
171 val |= (parts[0] << 24) | (parts[1] << 16);
172 break;
173
174 case 4: /* a.b.c.d -- 8.8.8.8 bits */
175 if (val > 0xff)
176 return (0);
177 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
178 break;
179 }
180 if (addr)
181 addr->s_addr = htonl(val);
182 return (1);
183 }
184
185 /* these are compatibility routines, not needed on recent BSD releases */
186
187 /*
188 * Ascii internet address interpretation routine.
189 * The value returned is in network order.
190 */
191 #if 0
192 inet_addr(const char *cp)
193 {
194 struct in_addr val;
195
196 if (inet_aton(cp, &val))
197 return (val.s_addr);
198 return (0xffffffff);
199 }
200 #endif
201