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/* tables.c is Copyright (c) 2014 Dohnuts All Rights Reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 dated June, 1991, or
(at your option) version 3 dated 29 June, 2007.
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, see <http://www.gnu.org/licenses/>.
*/
#include "dnsmasq.h"
#if defined(HAVE_IPSET) && defined(HAVE_BSD_NETWORK)
#include <sys/types.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/pfvar.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#define UNUSED(x) (void)(x)
static char *pf_device = "/dev/pf";
static int dev = -1;
static char *pfr_strerror(int errnum)
{
switch (errnum)
{
case ESRCH:
return "Table does not exist";
case ENOENT:
return "Anchor or Ruleset does not exist";
default:
return strerror(errnum);
}
}
static int pfr_add_tables(struct pfr_table *tbl, int size, int *nadd, int flags)
{
struct pfioc_table io;
if (size < 0 || (size && tbl == NULL))
{
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_buffer = tbl;
io.pfrio_esize = sizeof(*tbl);
io.pfrio_size = size;
if (ioctl(dev, DIOCRADDTABLES, &io))
return (-1);
if (nadd != NULL)
*nadd = io.pfrio_nadd;
return (0);
}
static int fill_addr(const struct all_addr *ipaddr, int flags, struct pfr_addr* addr) {
if ( !addr || !ipaddr)
{
my_syslog(LOG_ERR, _("error: fill_addr missused"));
return -1;
}
bzero(addr, sizeof(*addr));
#ifdef HAVE_IPV6
if (flags & F_IPV6)
{
addr->pfra_af = AF_INET6;
addr->pfra_net = 0x80;
memcpy(&(addr->pfra_ip6addr), &(ipaddr->addr), sizeof(struct in6_addr));
}
else
#endif
{
addr->pfra_af = AF_INET;
addr->pfra_net = 0x20;
addr->pfra_ip4addr.s_addr = ipaddr->addr.addr4.s_addr;
}
return 1;
}
/*****************************************************************************/
void ipset_init(void)
{
dev = open( pf_device, O_RDWR);
if (dev == -1)
{
err(1, "%s", pf_device);
die (_("failed to access pf devices: %s"), NULL, EC_MISC);
}
}
int add_to_ipset(const char *setname, const struct all_addr *ipaddr,
int flags, int remove)
{
struct pfr_addr addr;
struct pfioc_table io;
struct pfr_table table;
int n = 0, rc = 0;
if ( dev == -1 )
{
my_syslog(LOG_ERR, _("warning: no opened pf devices %s"), pf_device);
return -1;
}
bzero(&table, sizeof(struct pfr_table));
table.pfrt_flags |= PFR_TFLAG_PERSIST;
if ( strlen(setname) >= PF_TABLE_NAME_SIZE )
{
my_syslog(LOG_ERR, _("error: cannot use table name %s"), setname);
errno = ENAMETOOLONG;
return -1;
}
if ( strlcpy(table.pfrt_name, setname,
sizeof(table.pfrt_name)) >= sizeof(table.pfrt_name))
{
my_syslog(LOG_ERR, _("error: cannot strlcpy table name %s"), setname);
return -1;
}
if (rc = pfr_add_tables(&table, 1, &n, 0))
{
my_syslog(LOG_WARNING, _("warning: pfr_add_tables: %s(%d)"),
pfr_strerror(errno),rc);
return -1;
}
table.pfrt_flags &= ~PFR_TFLAG_PERSIST;
if (n)
my_syslog(LOG_INFO, _("info: table created"));
fill_addr(ipaddr,flags,&addr);
bzero(&io, sizeof(io));
io.pfrio_flags = 0;
io.pfrio_table = table;
io.pfrio_buffer = &addr;
io.pfrio_esize = sizeof(addr);
io.pfrio_size = 1;
if (ioctl(dev, ( remove ? DIOCRDELADDRS : DIOCRADDADDRS ), &io))
{
my_syslog(LOG_WARNING, _("warning: DIOCR%sADDRS: %s"), ( remove ? "DEL" : "ADD" ), pfr_strerror(errno));
return -1;
}
my_syslog(LOG_INFO, _("%d addresses %s"),
io.pfrio_nadd, ( remove ? "removed" : "added" ));
return io.pfrio_nadd;
}
#endif
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