1 /*
2 * Copyright (C) 1993-2001 by Darren Reed.
3 *
4 * See the IPFILTER.LICENCE file for details on licencing.
5 *
6 * $Id: genmask.c,v 1.7 2003/11/11 13:40:15 darrenr Exp $
7 */
8
9 #include "ipf.h"
10
11
genmask(msk,mskp)12 int genmask(msk, mskp)
13 char *msk;
14 u_32_t *mskp;
15 {
16 char *endptr = 0L;
17 int bits;
18
19 if (strchr(msk, '.') || strchr(msk, 'x') || strchr(msk, ':')) {
20 /* possibly of the form xxx.xxx.xxx.xxx
21 * or 0xYYYYYYYY */
22 #ifdef USE_INET6
23 if (use_inet6) {
24 if (inet_pton(AF_INET6, msk, mskp) != 1)
25 return -1;
26 } else
27 #endif
28 if (inet_aton(msk, (struct in_addr *)mskp) == 0)
29 return -1;
30 } else {
31 /*
32 * set x most significant bits
33 */
34 bits = (int)strtol(msk, &endptr, 0);
35 #ifdef USE_INET6
36 if ((*endptr != '\0') ||
37 ((bits > 32) && !use_inet6) || (bits < 0) ||
38 ((bits > 128) && use_inet6))
39 #else
40 if (*endptr != '\0' || bits > 32 || bits < 0)
41 #endif
42 return -1;
43 #ifdef USE_INET6
44 if (use_inet6)
45 fill6bits(bits, mskp);
46 else
47 #endif
48 if (bits == 0)
49 *mskp = 0;
50 else
51 *mskp = htonl(0xffffffff << (32 - bits));
52 }
53 return 0;
54 }
55