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3 * Portions Copyright (C) 1996-2001 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
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19 * Copyright (c) 1983, 1990, 1993
20 * The Regents of the University of California. All rights reserved.
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52 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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
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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.
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
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 */
80 #include <stddef.h> /* Required for NULL. */
82 #include <isc/types.h>
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.
93 isc_net_aton(const char *cp, struct in_addr *addr) {
98 isc_uint8_t *pp = parts;
104 * Collect number up to ``.''.
105 * Values are specified as for C:
106 * 0x=hex, 0=octal, isdigit=decimal.
108 if (!isdigit(c & 0xff))
110 val = 0; base = 10; digit = 0;
113 if (c == 'x' || c == 'X')
114 base = 16, c = *++cp;
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.
127 if (isascii(c) && isdigit(c)) {
128 if (base == 8 && (c == '8' || c == '9'))
130 val = (val * base) + (c - '0');
133 } else if (base == 16 && isascii(c) && isxdigit(c)) {
135 (c + 10 - (islower(c) ? 'a' : 'A'));
145 * a.b.c (with c treated as 16 bits)
146 * a.b (with b treated as 24 bits)
148 if (pp >= parts + 3 || val > 0xffU)
150 *pp++ = (isc_uint8_t)val;
156 * Check for trailing characters.
158 if (c != '\0' && (!isascii(c) || !isspace(c)))
161 * Did we get a valid digit?
166 * Concoct the address according to
167 * the number of parts specified.
171 case 1: /* a -- 32 bits */
174 case 2: /* a.b -- 8.24 bits */
177 val |= parts[0] << 24;
180 case 3: /* a.b.c -- 8.8.16 bits */
183 val |= (parts[0] << 24) | (parts[1] << 16);
186 case 4: /* a.b.c.d -- 8.8.8.8 bits */
189 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
193 addr->s_addr = htonl(val);