1 /*
2 * Portions Copyright (C) 2004, 2005, 2007, 2008 Internet Systems Consortium, Inc. ("ISC")
3 * Portions Copyright (C) 1996-2001 Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 /*
19 * Copyright (c) 1983, 1990, 1993
20 * The Regents of the University of California. All rights reserved.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * This product includes software developed by the University of
33 * California, Berkeley and its contributors.
34 * 4. Neither the name of the University nor the names of its contributors
35 * may be used to endorse or promote products derived from this software
36 * without specific prior written permission.
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
41 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 */
50
51 /*
52 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
53 *
54 * Permission to use, copy, modify, and distribute this software for any
55 * purpose with or without fee is hereby granted, provided that the above
56 * copyright notice and this permission notice appear in all copies, and that
57 * the name of Digital Equipment Corporation not be used in advertising or
58 * publicity pertaining to distribution of the document or software without
59 * specific, written prior permission.
60 *
61 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
62 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
63 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
64 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
65 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
66 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
67 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
68 * SOFTWARE.
69 */
70 /*! \file */
71
72 #if defined(LIBC_SCCS) && !defined(lint)
73 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
74 static char rcsid[] = "$Id: inet_aton.c,v 1.23 2008/12/01 23:47:45 tbox Exp $";
75 #endif /* LIBC_SCCS and not lint */
76
77 #include <config.h>
78
79 #include <ctype.h>
80 #include <stddef.h> /* Required for NULL. */
81
82 #include <isc/types.h>
83 #include <isc/net.h>
84
85 /*%
86 * Check whether "cp" is a valid ascii representation
87 * of an Internet address and convert to a binary address.
88 * Returns 1 if the address is valid, 0 if not.
89 * This replaces inet_addr, the return value from which
90 * cannot distinguish between failure and a local broadcast address.
91 */
92 int
isc_net_aton(const char * cp,struct in_addr * addr)93 isc_net_aton(const char *cp, struct in_addr *addr) {
94 unsigned long val;
95 int base;
96 unsigned char c;
97 isc_uint8_t parts[4];
98 isc_uint8_t *pp = parts;
99 int digit;
100
101 c = *cp;
102 for (;;) {
103 /*
104 * Collect number up to ``.''.
105 * Values are specified as for C:
106 * 0x=hex, 0=octal, isdigit=decimal.
107 */
108 if (!isdigit(c & 0xff))
109 return (0);
110 val = 0; base = 10; digit = 0;
111 if (c == '0') {
112 c = *++cp;
113 if (c == 'x' || c == 'X')
114 base = 16, c = *++cp;
115 else {
116 base = 8;
117 digit = 1;
118 }
119 }
120 for (;;) {
121 /*
122 * isascii() is valid for all integer values, and
123 * when it is true, c is known to be in scope
124 * for isdigit(). No cast necessary. Similar
125 * comment applies for later ctype uses.
126 */
127 if (isascii(c) && isdigit(c)) {
128 if (base == 8 && (c == '8' || c == '9'))
129 return (0);
130 val = (val * base) + (c - '0');
131 c = *++cp;
132 digit = 1;
133 } else if (base == 16 && isascii(c) && isxdigit(c)) {
134 val = (val << 4) |
135 (c + 10 - (islower(c) ? 'a' : 'A'));
136 c = *++cp;
137 digit = 1;
138 } else
139 break;
140 }
141 if (c == '.') {
142 /*
143 * Internet format:
144 * a.b.c.d
145 * a.b.c (with c treated as 16 bits)
146 * a.b (with b treated as 24 bits)
147 */
148 if (pp >= parts + 3 || val > 0xffU)
149 return (0);
150 *pp++ = (isc_uint8_t)val;
151 c = *++cp;
152 } else
153 break;
154 }
155 /*
156 * Check for trailing characters.
157 */
158 if (c != '\0' && (!isascii(c) || !isspace(c)))
159 return (0);
160 /*
161 * Did we get a valid digit?
162 */
163 if (!digit)
164 return (0);
165 /*
166 * Concoct the address according to
167 * the number of parts specified.
168 */
169 switch (pp - parts + 1) {
170 case 1: /* a -- 32 bits */
171 break;
172
173 case 2: /* a.b -- 8.24 bits */
174 if (val > 0xffffffU)
175 return (0);
176 val |= parts[0] << 24;
177 break;
178
179 case 3: /* a.b.c -- 8.8.16 bits */
180 if (val > 0xffffU)
181 return (0);
182 val |= (parts[0] << 24) | (parts[1] << 16);
183 break;
184
185 case 4: /* a.b.c.d -- 8.8.8.8 bits */
186 if (val > 0xffU)
187 return (0);
188 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
189 break;
190 }
191 if (addr != NULL)
192 addr->s_addr = htonl(val);
193
194 return (1);
195 }
196