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 1.6 2002/01/28 06:50:46 darrenr Exp $ 7 */ 8 9 #include "ipf.h" 10 11 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