1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include "port_before.h"
33
34 #include <sys/types.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
37 #include <ctype.h>
38
39 #include "port_after.h"
40
41 /*%
42 * Internet network address interpretation routine.
43 * The library routines call this routine to interpret
44 * network numbers.
45 */
46 in_addr_t
inet_network(const char * cp)47 inet_network(const char *cp)
48 {
49 in_addr_t val, base, n;
50 char c;
51 in_addr_t parts[4], *pp = parts;
52 int i, digit;
53
54 again:
55 val = 0; base = 10; digit = 0;
56 if (*cp == '0')
57 digit = 1, base = 8, cp++;
58 if (*cp == 'x' || *cp == 'X')
59 base = 16, cp++;
60 while ((c = *cp) != 0) {
61 if (isdigit((unsigned char)c)) {
62 if (base == 8U && (c == '8' || c == '9'))
63 return (INADDR_NONE);
64 val = (val * base) + (c - '0');
65 cp++;
66 digit = 1;
67 continue;
68 }
69 if (base == 16U && isxdigit((unsigned char)c)) {
70 val = (val << 4) +
71 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
72 cp++;
73 digit = 1;
74 continue;
75 }
76 break;
77 }
78 if (!digit)
79 return (INADDR_NONE);
80 if (pp >= parts + 4 || val > 0xffU)
81 return (INADDR_NONE);
82 if (*cp == '.') {
83 *pp++ = val, cp++;
84 goto again;
85 }
86 if (*cp && !isspace(*cp&0xff))
87 return (INADDR_NONE);
88 *pp++ = val;
89 n = pp - parts;
90 if (n > 4U)
91 return (INADDR_NONE);
92 for (val = 0, i = 0; i < n; i++) {
93 val <<= 8;
94 val |= parts[i] & 0xff;
95 }
96 return (val);
97 }
98
99 /*
100 * Weak aliases for applications that use certain private entry points,
101 * and fail to include <arpa/inet.h>.
102 */
103 #undef inet_network
104 __weak_reference(__inet_network, inet_network);
105
106 /*! \file */
107