NetBSD/dist/ipf/lib/genmask.c

57 lines
1.1 KiB
C

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