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/*
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "ha_ctl.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/select.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <threading/thread.h>
#include <processing/jobs/callback_job.h>
#define HA_FIFO IPSEC_PIDDIR "/charon.ha"
typedef struct private_ha_ctl_t private_ha_ctl_t;
/**
* Private data of an ha_ctl_t object.
*/
struct private_ha_ctl_t {
/**
* Public ha_ctl_t interface.
*/
ha_ctl_t public;
/**
* Segments to control
*/
ha_segments_t *segments;
/**
* Resynchronization message cache
*/
ha_cache_t *cache;
};
/**
* FIFO dispatching function
*/
static job_requeue_t dispatch_fifo(private_ha_ctl_t *this)
{
int fifo;
bool oldstate;
char buf[8];
u_int segment;
oldstate = thread_cancelability(TRUE);
fifo = open(HA_FIFO, O_RDONLY);
thread_cancelability(oldstate);
if (fifo == -1)
{
DBG1(DBG_CFG, "opening HA fifo failed: %s", strerror(errno));
sleep(1);
return JOB_REQUEUE_FAIR;
}
memset(buf, 0, sizeof(buf));
if (read(fifo, buf, sizeof(buf)-1) > 1)
{
segment = atoi(&buf[1]);
if (segment)
{
switch (buf[0])
{
case '+':
this->segments->activate(this->segments, segment, TRUE);
break;
case '-':
this->segments->deactivate(this->segments, segment, TRUE);
break;
case '*':
this->cache->resync(this->cache, segment);
break;
default:
break;
}
}
}
close(fifo);
return JOB_REQUEUE_DIRECT;
}
METHOD(ha_ctl_t, destroy, void,
private_ha_ctl_t *this)
{
free(this);
}
/**
* See header
*/
ha_ctl_t *ha_ctl_create(ha_segments_t *segments, ha_cache_t *cache)
{
private_ha_ctl_t *this;
mode_t old;
INIT(this,
.public = {
.destroy = _destroy,
},
.segments = segments,
.cache = cache,
);
if (access(HA_FIFO, R_OK|W_OK) != 0)
{
old = umask(~(S_IRWXU | S_IRWXG));
if (mkfifo(HA_FIFO, S_IRUSR | S_IWUSR) != 0)
{
DBG1(DBG_CFG, "creating HA FIFO %s failed: %s",
HA_FIFO, strerror(errno));
}
umask(old);
}
if (chown(HA_FIFO, lib->caps->get_uid(lib->caps),
lib->caps->get_gid(lib->caps)) != 0)
{
DBG1(DBG_CFG, "changing HA FIFO permissions failed: %s",
strerror(errno));
}
lib->processor->queue_job(lib->processor,
(job_t*)callback_job_create_with_prio((callback_job_cb_t)dispatch_fifo,
this, NULL, (callback_job_cancel_t)return_false, JOB_PRIO_CRITICAL));
return &this->public;
}
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