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/* ulogd
*
* userspace logging daemon for the iptables ULOG target
* of the linux 2.4 netfilter subsystem.
*
* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
* (C) 2012 by Eric Leblond <eric@regit.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <arpa/inet.h>
#include <ulogd/ulogd.h>
#include <ulogd/addr.h>
u_int32_t ulogd_bits2netmask(int bits)
{
u_int32_t netmask, bm;
if (bits >= 32 || bits < 0)
return(~0);
for (netmask = 0, bm = 0x80000000; bits; bits--, bm >>= 1)
netmask |= bm;
return netmask;
}
void ulogd_ipv6_cidr2mask_host(uint8_t cidr, uint32_t *res)
{
int i, j;
memset(res, 0, sizeof(uint32_t)*4);
for (i = 0; i < 4 && cidr > 32; i++) {
res[i] = 0xFFFFFFFF;
cidr -= 32;
}
res[i] = 0xFFFFFFFF << (32 - cidr);
for (j = i+1; j < 4; j++) {
res[j] = 0;
}
}
/* I need this function because I initially defined an IPv6 address as
* uint32 u[4]. Using char u[16] instead would allow to remove this. */
void ulogd_ipv6_addr2addr_host(uint32_t *addr, uint32_t *res)
{
int i;
memset(res, 0, sizeof(uint32_t)*4);
for (i = 0; i < 4; i++) {
res[i] = ntohl(addr[i]);
}
}
int ulogd_parse_addr(char *string, size_t len, struct ulogd_addr *addr)
{
char filter_addr[128];
char *slash;
char *ddash;
if ((ddash = strchr(string, ':')) && (ddash < string + len)) {
struct in6_addr raddr;
int i;
slash = strchr(string, '/');
if (slash == NULL) {
ulogd_log(ULOGD_FATAL,
"No network specified\n");
return -1;
}
strncpy(filter_addr, string,
slash - string);
filter_addr[slash - string] = 0;
if (inet_pton(AF_INET6, filter_addr, (void *)&raddr)
!= 1) {
ulogd_log(ULOGD_FATAL,
"error reading address\n");
return -1;
}
for(i = 0; i < 4; i++)
addr->in.ipv6[i] = raddr.s6_addr32[i];
addr->netmask = atoi(slash + 1);
return AF_INET6;
}
if ((ddash = strchr(string, '.')) && (ddash < string + len)) {
slash = strchr(string, '/');
if (slash == NULL) {
ulogd_log(ULOGD_FATAL,
"No network specified\n");
return -1;
}
strncpy(filter_addr, string,
slash - string);
filter_addr[slash - string] = 0;
addr->in.ipv4 = inet_addr(filter_addr);
addr->netmask = atoi(slash + 1);
return AF_INET;
}
return -1;
}
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