1 /* $OpenBSD: inet_addr.c,v 1.9 2005/08/06 20:30:03 espie Exp $ */
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. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 * -
33 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
34 *
35 * Permission to use, copy, modify, and distribute this software for any
36 * purpose with or without fee is hereby granted, provided that the above
37 * copyright notice and this permission notice appear in all copies, and that
38 * the name of Digital Equipment Corporation not be used in advertising or
39 * publicity pertaining to distribution of the document or software without
40 * specific, written prior permission.
41 *
42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
49 * SOFTWARE.
50 * -
51 * --Copyright--
52 */
53
54 #if 0
55 #include <sys/types.h>
56 #include <sys/param.h>
57 #include <netinet/in.h>
58 #include <arpa/inet.h>
59 #include <ctype.h>
60 #endif
61
62 #include <stdio.h>
63 #include <stdlib.h>
64 #include "q_ctype.h"
65 #include "dos_inet.h"
66
67 /*
68 * Ascii internet address interpretation routine.
69 * The value returned is in network order.
70 */
71 in_addr_t
inet_addr(const char * cp)72 inet_addr(const char *cp)
73 {
74 struct in_addr val;
75
76 if (inet_aton(cp, &val))
77 return (val.s_addr);
78 return (INADDR_NONE);
79 }
80
81 /*
82 * Check whether "cp" is a valid ascii representation
83 * of an Internet address and convert to a binary address.
84 * Returns 1 if the address is valid, 0 if not.
85 * This replaces inet_addr, the return value from which
86 * cannot distinguish between failure and a local broadcast address.
87 */
88 int
inet_aton(const char * cp,struct in_addr * addr)89 inet_aton(const char *cp, struct in_addr *addr)
90 {
91 in_addr_t val;
92 int base, n;
93 char c;
94 unsigned long parts[4]; /* u_int */
95 unsigned long *pp = parts; /* u_int */
96
97 c = *cp;
98 for (;;) {
99 /*
100 * Collect number up to ``.''.
101 * Values are specified as for C:
102 * 0x=hex, 0=octal, isdigit=decimal.
103 */
104 if (!q_isdigit(c))
105 return (0);
106 val = 0; base = 10;
107 if (c == '0') {
108 c = *++cp;
109 if (c == 'x' || c == 'X')
110 base = 16, c = *++cp;
111 else
112 base = 8;
113 }
114 for (;;) {
115 if (q_isascii(c) && q_isdigit(c)) {
116 val = (val * base) + (c - '0');
117 c = *++cp;
118 } else if (base == 16 && q_isascii(c) && q_isxdigit(c)) {
119 val = (val << 4) |
120 (c + 10 - (q_islower(c) ? 'a' : 'A'));
121 c = *++cp;
122 } else
123 break;
124 }
125 if (c == '.') {
126 /*
127 * Internet format:
128 * a.b.c.d
129 * a.b.c (with c treated as 16 bits)
130 * a.b (with b treated as 24 bits)
131 */
132 if (pp >= parts + 3)
133 return (0);
134 *pp++ = val;
135 c = *++cp;
136 } else
137 break;
138 }
139 /*
140 * Check for trailing characters.
141 */
142 if (c != '\0' && (!q_isascii(c) || !q_isspace(c)))
143 return (0);
144 /*
145 * Concoct the address according to
146 * the number of parts specified.
147 */
148 n = pp - parts + 1;
149 switch (n) {
150
151 case 0:
152 return (0); /* initial nondigit */
153
154 case 1: /* a -- 32 bits */
155 break;
156
157 case 2: /* a.b -- 8.24 bits */
158 if ((val > 0xffffff) || (parts[0] > 0xff))
159 return (0);
160 val |= parts[0] << 24;
161 break;
162
163 case 3: /* a.b.c -- 8.8.16 bits */
164 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
165 return (0);
166 val |= (parts[0] << 24) | (parts[1] << 16);
167 break;
168
169 case 4: /* a.b.c.d -- 8.8.8.8 bits */
170 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
171 return (0);
172 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
173 break;
174 }
175 if (addr)
176 addr->s_addr = htonl(val);
177 return (1);
178 }
179
180