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