1: /*
2: * Portions Copyright (C) 2004, 2005, 2007, 2009 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 1.1 2012/05/29 12:08:38 misho 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
93: isc_net_aton(const char *cp, struct in_addr *addr) {
94: unsigned long val;
95: int base, n;
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: n = pp - parts + 1;
170: switch (n) {
171: case 1: /* a -- 32 bits */
172: break;
173:
174: case 2: /* a.b -- 8.24 bits */
175: if (val > 0xffffffU)
176: return (0);
177: val |= parts[0] << 24;
178: break;
179:
180: case 3: /* a.b.c -- 8.8.16 bits */
181: if (val > 0xffffU)
182: return (0);
183: val |= (parts[0] << 24) | (parts[1] << 16);
184: break;
185:
186: case 4: /* a.b.c.d -- 8.8.8.8 bits */
187: if (val > 0xffU)
188: return (0);
189: val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
190: break;
191: }
192: if (addr != NULL)
193: addr->s_addr = htonl(val);
194:
195: return (1);
196: }
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