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 # ifdef __STDC__
70 # define __P(x) x
71 # else
72 # define __P(x) ()
73 # endif
74 #endif
75 #ifndef linux
76 int inet_aton __P((const char *, struct in_addr *));
77
78 /*
79 * Because the ctype(3) posix definition, if used "safely" in code everywhere,
80 * would mean all normal code that walks through strings needed casts. Yuck.
81 */
82 #define ISALNUM(x) isalnum((u_char)(x))
83 #define ISALPHA(x) isalpha((u_char)(x))
84 #define ISASCII(x) isascii((u_char)(x))
85 #define ISDIGIT(x) isdigit((u_char)(x))
86 #define ISPRINT(x) isprint((u_char)(x))
87 #define ISSPACE(x) isspace((u_char)(x))
88 #define ISUPPER(x) isupper((u_char)(x))
89 #define ISXDIGIT(x) isxdigit((u_char)(x))
90 #define ISLOWER(x) islower((u_char)(x))
91
92 /*
93 * Check whether "cp" is a valid ascii representation
94 * of an Internet address and convert to a binary address.
95 * Returns 1 if the address is valid, 0 if not.
96 * This replaces inet_addr, the return value from which
97 * cannot distinguish between failure and a local broadcast address.
98 */
99 int
inet_aton(cp,addr)100 inet_aton(cp, addr)
101 register const char *cp;
102 struct in_addr *addr;
103 {
104 register u_long val;
105 register int base, n;
106 register char c;
107 u_int parts[4];
108 register u_int *pp = parts;
109
110 c = *cp;
111 for (;;) {
112 /*
113 * Collect number up to ``.''.
114 * Values are specified as for C:
115 * 0x=hex, 0=octal, isdigit=decimal.
116 */
117 if (!ISDIGIT(c))
118 return (0);
119 val = 0; base = 10;
120 if (c == '0') {
121 c = *++cp;
122 if (c == 'x' || c == 'X')
123 base = 16, c = *++cp;
124 else
125 base = 8;
126 }
127 for (;;) {
128 if (ISASCII(c) && ISDIGIT(c)) {
129 val = (val * base) + (c - '0');
130 c = *++cp;
131 } else if (base == 16 && ISASCII(c) && ISXDIGIT(c)) {
132 val = (val << 4) |
133 (c + 10 - (ISLOWER(c) ? 'a' : 'A'));
134 c = *++cp;
135 } else
136 break;
137 }
138 if (c == '.') {
139 /*
140 * Internet format:
141 * a.b.c.d
142 * a.b.c (with c treated as 16 bits)
143 * a.b (with b treated as 24 bits)
144 */
145 if (pp >= parts + 3)
146 return (0);
147 *pp++ = val;
148 c = *++cp;
149 } else
150 break;
151 }
152 /*
153 * Check for trailing characters.
154 */
155 if (c != '\0' && (!ISASCII(c) || !ISSPACE(c)))
156 return (0);
157 /*
158 * Concoct the address according to
159 * the number of parts specified.
160 */
161 n = pp - parts + 1;
162 switch (n) {
163
164 case 0:
165 return (0); /* initial nondigit */
166
167 case 1: /* a -- 32 bits */
168 break;
169
170 case 2: /* a.b -- 8.24 bits */
171 if (val > 0xffffff)
172 return (0);
173 val |= parts[0] << 24;
174 break;
175
176 case 3: /* a.b.c -- 8.8.16 bits */
177 if (val > 0xffff)
178 return (0);
179 val |= (parts[0] << 24) | (parts[1] << 16);
180 break;
181
182 case 4: /* a.b.c.d -- 8.8.8.8 bits */
183 if (val > 0xff)
184 return (0);
185 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
186 break;
187 }
188 if (addr)
189 addr->s_addr = htonl(val);
190 return (1);
191 }
192 #endif
193
194 /* these are compatibility routines, not needed on recent BSD releases */
195
196 /*
197 * Ascii internet address interpretation routine.
198 * The value returned is in network order.
199 */
200 #if 0
201 inet_addr(cp)
202 const char *cp;
203 {
204 struct in_addr val;
205
206 if (inet_aton(cp, &val))
207 return (val.s_addr);
208 return (0xffffffff);
209 }
210 #endif
211