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/*
* 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 <ctype.h>
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;
}
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