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/*
* Copyright (C) 2008-2009 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_socket.h"
#include "ha_plugin.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <unistd.h>
#include <daemon.h>
#include <utils/host.h>
#include <threading/thread.h>
#include <processing/jobs/callback_job.h>
typedef struct private_ha_socket_t private_ha_socket_t;
/**
* Private data of an ha_socket_t object.
*/
struct private_ha_socket_t {
/**
* Public ha_socket_t interface.
*/
ha_socket_t public;
/**
* UDP communication socket fd
*/
int fd;
/**
* local host to receive/send from
*/
host_t *local;
/**
* remote host to receive/send to
*/
host_t *remote;
};
/**
* Data to pass to the send_message() callback job
*/
typedef struct {
chunk_t chunk;
int fd;
} job_data_t;
/**
* Cleanup job data
*/
static void job_data_destroy(job_data_t *this)
{
free(this->chunk.ptr);
free(this);
}
/**
* Callback to asynchronously send messages
*/
static job_requeue_t send_message(job_data_t *data)
{
if (send(data->fd, data->chunk.ptr, data->chunk.len, 0) < data->chunk.len)
{
DBG1(DBG_CFG, "pushing HA message failed: %s", strerror(errno));
}
return JOB_REQUEUE_NONE;
}
METHOD(ha_socket_t, push, void,
private_ha_socket_t *this, ha_message_t *message)
{
chunk_t chunk;
/* Try to send synchronously, but non-blocking. */
chunk = message->get_encoding(message);
if (send(this->fd, chunk.ptr, chunk.len, MSG_DONTWAIT) < chunk.len)
{
if (errno == EAGAIN)
{
callback_job_t *job;
job_data_t *data;
/* Fallback to asynchronous transmission. This is required, as sendto()
* is a blocking call if it acquires a policy. We could end up in a
* deadlock, as we own an IKE_SA. */
INIT(data,
.chunk = chunk_clone(chunk),
.fd = this->fd,
);
job = callback_job_create_with_prio((callback_job_cb_t)send_message,
data, (void*)job_data_destroy, NULL, JOB_PRIO_HIGH);
lib->processor->queue_job(lib->processor, (job_t*)job);
return;
}
DBG1(DBG_CFG, "pushing HA message failed: %s", strerror(errno));
}
}
METHOD(ha_socket_t, pull, ha_message_t*,
private_ha_socket_t *this)
{
while (TRUE)
{
ha_message_t *message;
char buf[1024];
bool oldstate;
ssize_t len;
oldstate = thread_cancelability(TRUE);
len = recv(this->fd, buf, sizeof(buf), 0);
thread_cancelability(oldstate);
if (len <= 0)
{
switch (errno)
{
case ECONNREFUSED:
case EINTR:
continue;
default:
DBG1(DBG_CFG, "pulling HA message failed: %s",
strerror(errno));
sleep(1);
continue;
}
}
message = ha_message_parse(chunk_create(buf, len));
if (message)
{
return message;
}
}
}
/**
* Open and connect the HA socket
*/
static bool open_socket(private_ha_socket_t *this)
{
this->fd = socket(this->local->get_family(this->local), SOCK_DGRAM, 0);
if (this->fd == -1)
{
DBG1(DBG_CFG, "opening HA socket failed: %s", strerror(errno));
return FALSE;
}
if (bind(this->fd, this->local->get_sockaddr(this->local),
*this->local->get_sockaddr_len(this->local)) == -1)
{
DBG1(DBG_CFG, "binding HA socket failed: %s", strerror(errno));
close(this->fd);
this->fd = -1;
return FALSE;
}
if (connect(this->fd, this->remote->get_sockaddr(this->remote),
*this->remote->get_sockaddr_len(this->remote)) == -1)
{
DBG1(DBG_CFG, "connecting HA socket failed: %s", strerror(errno));
close(this->fd);
this->fd = -1;
return FALSE;
}
return TRUE;
}
METHOD(ha_socket_t, destroy, void,
private_ha_socket_t *this)
{
if (this->fd != -1)
{
close(this->fd);
}
DESTROY_IF(this->local);
DESTROY_IF(this->remote);
free(this);
}
/**
* See header
*/
ha_socket_t *ha_socket_create(char *local, char *remote)
{
private_ha_socket_t *this;
INIT(this,
.public = {
.push = _push,
.pull = _pull,
.destroy = _destroy,
},
.local = host_create_from_dns(local, 0, HA_PORT),
.remote = host_create_from_dns(remote, 0, HA_PORT),
.fd = -1,
);
if (!this->local || !this->remote)
{
DBG1(DBG_CFG, "invalid local/remote HA address");
destroy(this);
return NULL;
}
if (!open_socket(this))
{
destroy(this);
return NULL;
}
return &this->public;
}
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