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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.
*
* Description: run and init functions
*/
#include "conntrackd.h"
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
#include <errno.h>
#include "us-conntrack.h"
#include <signal.h>
#include <stdlib.h>
void killer(int foo)
{
/* no signals while handling signals */
sigprocmask(SIG_BLOCK, &STATE(block), NULL);
nfnl_subsys_close(STATE(subsys_event));
nfnl_subsys_close(STATE(subsys_dump));
nfnl_subsys_close(STATE(subsys_sync));
nfnl_close(STATE(event));
nfnl_close(STATE(dump));
nfnl_close(STATE(sync));
ignore_pool_destroy(STATE(ignore_pool));
local_server_destroy(STATE(local));
STATE(mode)->kill();
unlink(CONFIG(lockfile));
dlog(STATE(log), "------- shutdown received ----");
close_log(STATE(log));
sigprocmask(SIG_UNBLOCK, &STATE(block), NULL);
exit(0);
}
void local_handler(int fd, void *data)
{
int ret;
int type;
ret = read(fd, &type, sizeof(type));
if (ret == -1) {
dlog(STATE(log), "can't read from unix socket\n");
return;
}
if (ret == 0) {
debug("nothing to process\n");
return;
}
switch(type) {
case FLUSH_MASTER:
dlog(STATE(log), "[REQ] flushing master table");
nl_flush_master_conntrack_table();
return;
case RESYNC_MASTER:
dlog(STATE(log), "[REQ] resync with master table");
nl_dump_conntrack_table(STATE(dump), STATE(subsys_dump));
return;
}
if (!STATE(mode)->local(fd, type, data))
dlog(STATE(log), "[FAIL] unknown local request %d", type);
}
int init(int mode)
{
switch(mode) {
case STATS_MODE:
STATE(mode) = &stats_mode;
break;
case SYNC_MODE:
STATE(mode) = &sync_mode;
break;
default:
fprintf(stderr, "Unknown running mode! default "
"to synchronization mode\n");
STATE(mode) = &sync_mode;
break;
}
/* Initialization */
if (STATE(mode)->init() == -1) {
dlog(STATE(log), "[FAIL] initialization failed");
return -1;
}
/* local UNIX socket */
STATE(local) = local_server_create(&CONFIG(local));
if (!STATE(local)) {
dlog(STATE(log), "[FAIL] can't open unix socket!");
return -1;
}
if (nl_init_event_handler() == -1) {
dlog(STATE(log), "[FAIL] can't open netlink handler! "
"no ctnetlink kernel support?");
return -1;
}
if (nl_init_dump_handler() == -1) {
dlog(STATE(log), "[FAIL] can't open netlink handler! "
"no ctnetlink kernel support?");
return -1;
}
if (nl_init_overrun_handler() == -1) {
dlog(STATE(log), "[FAIL] can't open netlink handler! "
"no ctnetlink kernel support?");
return -1;
}
/* Signals handling */
sigemptyset(&STATE(block));
sigaddset(&STATE(block), SIGTERM);
sigaddset(&STATE(block), SIGINT);
if (signal(SIGINT, killer) == SIG_ERR)
return -1;
if (signal(SIGTERM, killer) == SIG_ERR)
return -1;
/* ignore connection reset by peer */
if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
return -1;
dlog(STATE(log), "[OK] initialization completed");
return 0;
}
#define POLL_NSECS 1
static void __run(void)
{
int max, ret;
fd_set readfds;
struct timeval tv = {
.tv_sec = POLL_NSECS,
.tv_usec = 0
};
FD_ZERO(&readfds);
FD_SET(STATE(local), &readfds);
FD_SET(nfnl_fd(STATE(event)), &readfds);
max = MAX(STATE(local), nfnl_fd(STATE(event)));
if (STATE(mode)->add_fds_to_set)
max = MAX(max, STATE(mode)->add_fds_to_set(&readfds));
ret = select(max+1, &readfds, NULL, NULL, &tv);
if (ret == -1) {
/* interrupted syscall, retry */
if (errno == EINTR)
return;
dlog(STATE(log), "select() failed: %s", strerror(errno));
return;
}
/* signals are racy */
sigprocmask(SIG_BLOCK, &STATE(block), NULL);
/* order received via UNIX socket */
if (FD_ISSET(STATE(local), &readfds))
do_local_server_step(STATE(local), NULL, local_handler);
/* conntrack event has happened */
if (FD_ISSET(nfnl_fd(STATE(event)), &readfds)) {
ret = nfnl_catch(STATE(event));
if (ret == -1) {
switch(errno) {
case ENOBUFS:
/*
* It seems that ctnetlink can't back off,
* it's likely that we're losing events.
* Solution: duplicate the socket buffer
* size and resync with master conntrack table.
*/
nl_resize_socket_buffer(STATE(event));
nl_dump_conntrack_table(STATE(sync),
STATE(subsys_sync));
break;
case ENOENT:
/*
* We received a message from another
* netfilter subsystem that we are not
* interested in. Just ignore it.
*/
break;
default:
dlog(STATE(log), "event catch says: %s",
strerror(errno));
break;
}
}
}
if (STATE(mode)->step)
STATE(mode)->step(&readfds);
sigprocmask(SIG_UNBLOCK, &STATE(block), NULL);
}
void run(void)
{
while(1)
__run();
}
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