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/*********************************************************************************************************
* Software License Agreement (BSD License) *
* Author: Sebastien Decugis <sdecugis@freediameter.net> *
* *
* Copyright (c) 2020, WIDE Project and NICT *
* All rights reserved. *
* *
* Redistribution and use of this software in source and binary forms, with or without modification, are *
* permitted provided that the following conditions are met: *
* *
* * Redistributions of source code must retain the above *
* copyright notice, this list of conditions and the *
* following disclaimer. *
* *
* * Redistributions in binary form must reproduce the above *
* copyright notice, this list of conditions and the *
* following disclaimer in the documentation and/or other *
* materials provided with the distribution. *
* *
* * Neither the name of the WIDE Project or NICT nor the *
* names of its contributors may be used to endorse or *
* promote products derived from this software without *
* specific prior written permission of WIDE Project and *
* NICT. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
*********************************************************************************************************/
/*
* Configurable routing of messages for freeDiameter.
*/
#include <signal.h>
#include "rt_default.h"
#define MODULE_NAME "rt_default"
#include <pthread.h>
static pthread_rwlock_t rtd_lock;
static char *rtd_config_file;
/* The callback called on new messages */
static int rtd_out(void * cbdata, struct msg ** pmsg, struct fd_list * candidates)
{
struct msg * msg = *pmsg;
TRACE_ENTRY("%p %p %p", cbdata, msg, candidates);
int ret;
CHECK_PARAMS(msg && candidates);
if (pthread_rwlock_rdlock(&rtd_lock) != 0) {
fd_log_notice("%s: read-lock failed, skipping handler", MODULE_NAME);
return 0;
}
/* Simply pass it to the appropriate function */
if (FD_IS_LIST_EMPTY(candidates)) {
ret = 0;
} else {
ret = rtd_process( msg, candidates );
}
if (pthread_rwlock_unlock(&rtd_lock) != 0) {
fd_log_notice("%s: read-unlock failed after rtd_out, exiting", MODULE_NAME);
exit(1);
}
return ret;
}
/* handler */
static struct fd_rt_out_hdl * rtd_hdl = NULL;
static volatile int in_signal_handler = 0;
/* signal handler */
static void sig_hdlr(void)
{
if (in_signal_handler) {
fd_log_error("%s: already handling a signal, ignoring new one", MODULE_NAME);
return;
}
in_signal_handler = 1;
if (pthread_rwlock_wrlock(&rtd_lock) != 0) {
fd_log_error("%s: locking failed, aborting config reload", MODULE_NAME);
return;
}
rtd_conf_reload(rtd_config_file);
if (pthread_rwlock_unlock(&rtd_lock) != 0) {
fd_log_error("%s: unlocking failed after config reload, exiting", MODULE_NAME);
exit(1);
}
fd_log_notice("%s: reloaded configuration", MODULE_NAME);
in_signal_handler = 0;
}
/* entry point */
static int rtd_entry(char * conffile)
{
TRACE_ENTRY("%p", conffile);
rtd_config_file = conffile;
pthread_rwlock_init(&rtd_lock, NULL);
if (pthread_rwlock_wrlock(&rtd_lock) != 0) {
fd_log_notice("%s: write-lock failed, aborting", MODULE_NAME);
return EDEADLK;
}
/* Initialize the repo */
CHECK_FCT( rtd_init() );
/* Parse the configuration file */
CHECK_FCT( rtd_conf_handle(conffile) );
if (pthread_rwlock_unlock(&rtd_lock) != 0) {
fd_log_notice("%s: write-unlock failed, aborting", MODULE_NAME);
return EDEADLK;
}
/* Register reload callback */
CHECK_FCT(fd_event_trig_regcb(SIGUSR1, MODULE_NAME, sig_hdlr));
#if 0
/* Dump the rules */
rtd_dump();
#endif /* 0 */
/* Register the callback */
CHECK_FCT( fd_rt_out_register( rtd_out, NULL, 5, &rtd_hdl ) );
/* We're done */
return 0;
}
/* Unload */
void fd_ext_fini(void)
{
TRACE_ENTRY();
/* Unregister the cb */
CHECK_FCT_DO( fd_rt_out_unregister ( rtd_hdl, NULL ), /* continue */ );
/* Destroy the data */
rtd_fini();
pthread_rwlock_destroy(&rtd_lock);
/* Done */
return ;
}
EXTENSION_ENTRY(MODULE_NAME, rtd_entry);
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