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/*
* (C) 2006-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include "cache.h"
#include "conntrackd.h"
#include <libnfnetlink/libnfnetlink.h>
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
#include <errno.h>
#include "us-conntrack.h"
#include <signal.h>
#include <sys/select.h>
static int init_stats(void)
{
int ret;
state.stats = malloc(sizeof(struct ct_stats_state));
if (!state.stats) {
dlog(STATE(log), "[FAIL] can't allocate memory for stats sync");
return -1;
}
memset(state.stats, 0, sizeof(struct ct_stats_state));
STATE_STATS(cache) = cache_create("stats",
LIFETIME,
CONFIG(family),
NULL);
if (!STATE_STATS(cache)) {
dlog(STATE(log), "[FAIL] can't allocate memory for the "
"external cache");
return -1;
}
return 0;
}
static void kill_stats()
{
cache_destroy(STATE_STATS(cache));
}
/* handler for requests coming via UNIX socket */
static int local_handler_stats(int fd, int type, void *data)
{
int ret = 1;
switch(type) {
case DUMP_INTERNAL:
cache_dump(STATE_STATS(cache), fd, NFCT_O_PLAIN);
break;
case DUMP_INT_XML:
cache_dump(STATE_STATS(cache), fd, NFCT_O_XML);
break;
case FLUSH_CACHE:
dlog(STATE(log), "[REQ] flushing caches");
cache_flush(STATE_STATS(cache));
break;
case KILL:
killer();
break;
case STATS:
cache_stats(STATE_STATS(cache), fd);
dump_traffic_stats(fd);
break;
default:
ret = 0;
break;
}
return ret;
}
static void dump_stats(struct nf_conntrack *ct, struct nlmsghdr *nlh)
{
if (cache_update_force(STATE_STATS(cache), ct))
debug_ct(ct, "resync entry");
}
static int overrun_cb(enum nf_conntrack_msg_type type,
struct nf_conntrack *ct,
void *data)
{
/* This is required by kernels < 2.6.20 */
nfct_attr_unset(ct, ATTR_TIMEOUT);
nfct_attr_unset(ct, ATTR_ORIG_COUNTER_BYTES);
nfct_attr_unset(ct, ATTR_ORIG_COUNTER_PACKETS);
nfct_attr_unset(ct, ATTR_REPL_COUNTER_BYTES);
nfct_attr_unset(ct, ATTR_REPL_COUNTER_PACKETS);
nfct_attr_unset(ct, ATTR_USE);
if (!cache_test(STATE_STATS(cache), ct))
if (!cache_update_force(STATE_STATS(cache), ct))
debug_ct(ct, "overrun stats resync");
return NFCT_CB_CONTINUE;
}
static void overrun_stats()
{
int ret;
struct nfct_handle *h;
int family = CONFIG(family);
h = nfct_open(CONNTRACK, 0);
if (!h) {
dlog(STATE(log), "can't open overrun handler");
return;
}
nfct_callback_register(h, NFCT_T_ALL, overrun_cb, NULL);
cache_flush(STATE_STATS(cache));
ret = nfct_query(h, NFCT_Q_DUMP, &family);
if (ret == -1)
dlog(STATE(log), "overrun query error %s", strerror(errno));
nfct_close(h);
}
static void event_new_stats(struct nf_conntrack *ct, struct nlmsghdr *nlh)
{
debug_ct(ct, "debug event");
if (cache_add(STATE_STATS(cache), ct)) {
debug_ct(ct, "cache new");
} else {
dlog(STATE(log), "can't add to cache cache: "
"%s\n", strerror(errno));
debug_ct(ct, "can't add");
}
}
static void event_update_stats(struct nf_conntrack *ct, struct nlmsghdr *nlh)
{
debug_ct(ct, "update");
if (!cache_update(STATE_STATS(cache), ct)) {
/*
* Perhaps we are losing events. If we are working
* in relax mode then add a new entry to the cache.
*
* FIXME: relax transitions not implemented yet
*/
if ((CONFIG(flags) & RELAX_TRANSITIONS)
&& cache_add(STATE_STATS(cache), ct)) {
debug_ct(ct, "forcing cache update");
} else {
debug_ct(ct, "can't update");
return;
}
}
debug_ct(ct, "update");
}
static int event_destroy_stats(struct nf_conntrack *ct, struct nlmsghdr *nlh)
{
if (cache_del(STATE_STATS(cache), ct)) {
debug_ct(ct, "cache destroy");
return 1;
} else {
debug_ct(ct, "can't destroy!");
return 0;
}
}
struct ct_mode stats_mode = {
.init = init_stats,
.add_fds_to_set = NULL,
.step = NULL,
.local = local_handler_stats,
.kill = kill_stats,
.dump = dump_stats,
.overrun = overrun_stats,
.event_new = event_new_stats,
.event_upd = event_update_stats,
.event_dst = event_destroy_stats
};
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