/* * Copyright (C) 2012 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. * * $Id: alist_new.c,v 1.5.2.2 2012/07/22 08:04:24 darren_r Exp $ */ #include "ipf.h" #include alist_t * alist_new(int family, char *host) { int a, b, c, d, bits; char *slash; alist_t *al; u_int mask; if (family == AF_UNSPEC) { if (strchr(host, ':') != NULL) family = AF_INET6; else family = AF_INET; } if (family != AF_INET && family != AF_INET6) return (NULL); al = calloc(1, sizeof(*al)); if (al == NULL) { fprintf(stderr, "alist_new out of memory\n"); return (NULL); } while (ISSPACE(*host)) host++; if (*host == '!') { al->al_not = 1; host++; while (ISSPACE(*host)) host++; } bits = -1; slash = strchr(host, '/'); if (slash != NULL) { *slash = '\0'; bits = atoi(slash + 1); } if (family == AF_INET) { if (bits > 32) goto bad; a = b = c = d = -1; sscanf(host, "%d.%d.%d.%d", &a, &b, &c, &d); if (bits > 0 && bits < 33) { mask = 0xffffffff << (32 - bits); } else if (b == -1) { mask = 0xff000000; b = c = d = 0; } else if (c == -1) { mask = 0xffff0000; c = d = 0; } else if (d == -1) { mask = 0xffffff00; d = 0; } else { mask = 0xffffffff; } al->al_mask = htonl(mask); } else { if (bits > 128) goto bad; fill6bits(bits, al->al_i6mask.i6); } if (gethost(family, host, &al->al_i6addr) == -1) { if (slash != NULL) *slash = '/'; fprintf(stderr, "Cannot parse hostname\n"); goto bad; } al->al_family = family; if (slash != NULL) *slash = '/'; return (al); bad: free(al); return (NULL); }