57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
/* $NetBSD: genmask.c,v 1.1.1.1 2004/03/28 08:56:18 martti Exp $ */
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/*
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* Copyright (C) 1993-2001 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* Id: genmask.c,v 1.7 2003/11/11 13:40:15 darrenr Exp
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*/
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#include "ipf.h"
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int genmask(msk, mskp)
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char *msk;
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u_32_t *mskp;
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{
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char *endptr = 0L;
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int bits;
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if (strchr(msk, '.') || strchr(msk, 'x') || strchr(msk, ':')) {
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/* possibly of the form xxx.xxx.xxx.xxx
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* or 0xYYYYYYYY */
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#ifdef USE_INET6
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if (use_inet6) {
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if (inet_pton(AF_INET6, msk, mskp) != 1)
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return -1;
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} else
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#endif
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if (inet_aton(msk, (struct in_addr *)mskp) == 0)
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return -1;
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} else {
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/*
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* set x most significant bits
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*/
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bits = (int)strtol(msk, &endptr, 0);
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#ifdef USE_INET6
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if ((*endptr != '\0') ||
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((bits > 32) && !use_inet6) || (bits < 0) ||
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((bits > 128) && use_inet6))
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#else
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if (*endptr != '\0' || bits > 32 || bits < 0)
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#endif
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return -1;
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#ifdef USE_INET6
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if (use_inet6)
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fill6bits(bits, mskp);
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else
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#endif
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if (bits == 0)
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*mskp = 0;
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else
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*mskp = htonl(0xffffffff << (32 - bits));
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}
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return 0;
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}
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