/*
 * 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;
}