1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static const char sccsid[] = "@(#)inet_network.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33
34 #include "port_before.h"
35
36 #include <sys/types.h>
37 #include <netinet/in.h>
38 #include <arpa/inet.h>
39 #include <ctype.h>
40
41 #include "port_after.h"
42
43 /*%
44 * Internet network address interpretation routine.
45 * The library routines call this routine to interpret
46 * network numbers.
47 */
48 in_addr_t
inet_network(const char * cp)49 inet_network(const char *cp)
50 {
51 in_addr_t val, base, n;
52 char c;
53 in_addr_t parts[4], *pp = parts;
54 int i, digit;
55 again:
56 val = 0; base = 10; digit = 0;
57 if (*cp == '0')
58 digit = 1, base = 8, cp++;
59 if (*cp == 'x' || *cp == 'X')
60 base = 16, cp++;
61 while ((c = *cp) != 0) {
62 if (isdigit((unsigned char)c)) {
63 if (base == 8U && (c == '8' || c == '9'))
64 return (INADDR_NONE);
65 val = (val * base) + (c - '0');
66 cp++;
67 digit = 1;
68 continue;
69 }
70 if (base == 16U && isxdigit((unsigned char)c)) {
71 val = (val << 4) +
72 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
73 cp++;
74 digit = 1;
75 continue;
76 }
77 break;
78 }
79 if (!digit)
80 return (INADDR_NONE);
81 if (pp >= parts + 4 || val > 0xffU)
82 return (INADDR_NONE);
83 if (*cp == '.') {
84 *pp++ = val, cp++;
85 goto again;
86 }
87 if (*cp && !isspace(*cp&0xff))
88 return (INADDR_NONE);
89 *pp++ = val;
90 n = pp - parts;
91 if (n > 4U)
92 return (INADDR_NONE);
93 for (val = 0, i = 0; i < n; i++) {
94 val <<= 8;
95 val |= parts[i] & 0xff;
96 }
97 return (val);
98 }
99
100 #ifdef _LIBC
101 /*
102 * Weak aliases for applications that use certain private entry points,
103 * and fail to include <arpa/inet.h>.
104 */
105 #undef inet_network
106 __weak_reference(__inet_network, inet_network);
107 #endif
108 /*! \file */
109