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/*
* Copyright (C) 2012 Tobias Brunner
* Copyright (C) 2005-2006 Martin Willi
* Copyright (C) 2005 Jan Hutter
* 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 <unistd.h>
#include <stdlib.h>
#include "sender.h"
#include <daemon.h>
#include <network/socket.h>
#include <processing/jobs/callback_job.h>
#include <threading/thread.h>
#include <threading/condvar.h>
#include <threading/mutex.h>
typedef struct private_sender_t private_sender_t;
/**
* Private data of a sender_t object.
*/
struct private_sender_t {
/**
* Public part of a sender_t object.
*/
sender_t public;
/**
* The packets are stored in a linked list
*/
linked_list_t *list;
/**
* mutex to synchronize access to list
*/
mutex_t *mutex;
/**
* condvar to signal for packets added to list
*/
condvar_t *got;
/**
* condvar to signal for packets sent
*/
condvar_t *sent;
/**
* Delay for sending outgoing packets, to simulate larger RTT
*/
int send_delay;
/**
* Specific message type to delay, 0 for any
*/
int send_delay_type;
/**
* Delay request messages?
*/
bool send_delay_request;
/**
* Delay response messages?
*/
bool send_delay_response;
};
METHOD(sender_t, send_no_marker, void,
private_sender_t *this, packet_t *packet)
{
this->mutex->lock(this->mutex);
this->list->insert_last(this->list, packet);
this->got->signal(this->got);
this->mutex->unlock(this->mutex);
}
METHOD(sender_t, send_, void,
private_sender_t *this, packet_t *packet)
{
host_t *src, *dst;
src = packet->get_source(packet);
dst = packet->get_destination(packet);
DBG1(DBG_NET, "sending packet: from %#H to %#H (%zu bytes)", src, dst,
packet->get_data(packet).len);
if (this->send_delay)
{
message_t *message;
message = message_create_from_packet(packet->clone(packet));
if (message->parse_header(message) == SUCCESS)
{
if (this->send_delay_type == 0 ||
this->send_delay_type == message->get_exchange_type(message))
{
if ((message->get_request(message) && this->send_delay_request) ||
(!message->get_request(message) && this->send_delay_response))
{
DBG1(DBG_NET, "using send delay: %dms", this->send_delay);
usleep(this->send_delay * 1000);
}
}
}
message->destroy(message);
}
/* if neither source nor destination port is 500 we add a Non-ESP marker */
if (dst->get_port(dst) != IKEV2_UDP_PORT &&
src->get_port(src) != IKEV2_UDP_PORT)
{
chunk_t data, marker = chunk_from_chars(0x00, 0x00, 0x00, 0x00);
data = chunk_cat("cc", marker, packet->get_data(packet));
packet->set_data(packet, data);
}
send_no_marker(this, packet);
}
/**
* Job callback function to send packets
*/
static job_requeue_t send_packets(private_sender_t *this)
{
packet_t *packet;
bool oldstate;
this->mutex->lock(this->mutex);
while (this->list->get_count(this->list) == 0)
{
/* add cleanup handler, wait for packet, remove cleanup handler */
thread_cleanup_push((thread_cleanup_t)this->mutex->unlock, this->mutex);
oldstate = thread_cancelability(TRUE);
this->got->wait(this->got, this->mutex);
thread_cancelability(oldstate);
thread_cleanup_pop(FALSE);
}
this->list->remove_first(this->list, (void**)&packet);
this->sent->signal(this->sent);
this->mutex->unlock(this->mutex);
charon->socket->send(charon->socket, packet);
packet->destroy(packet);
return JOB_REQUEUE_DIRECT;
}
METHOD(sender_t, flush, void,
private_sender_t *this)
{
/* send all packets in the queue */
this->mutex->lock(this->mutex);
while (this->list->get_count(this->list))
{
this->sent->wait(this->sent, this->mutex);
}
this->mutex->unlock(this->mutex);
}
METHOD(sender_t, destroy, void,
private_sender_t *this)
{
this->list->destroy_offset(this->list, offsetof(packet_t, destroy));
this->got->destroy(this->got);
this->sent->destroy(this->sent);
this->mutex->destroy(this->mutex);
free(this);
}
/*
* Described in header.
*/
sender_t * sender_create()
{
private_sender_t *this;
INIT(this,
.public = {
.send = _send_,
.send_no_marker = _send_no_marker,
.flush = _flush,
.destroy = _destroy,
},
.list = linked_list_create(),
.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
.got = condvar_create(CONDVAR_TYPE_DEFAULT),
.sent = condvar_create(CONDVAR_TYPE_DEFAULT),
.send_delay = lib->settings->get_int(lib->settings,
"%s.send_delay", 0, charon->name),
.send_delay_type = lib->settings->get_int(lib->settings,
"%s.send_delay_type", 0, charon->name),
.send_delay_request = lib->settings->get_bool(lib->settings,
"%s.send_delay_request", TRUE, charon->name),
.send_delay_response = lib->settings->get_bool(lib->settings,
"%s.send_delay_response", TRUE, charon->name),
);
lib->processor->queue_job(lib->processor,
(job_t*)callback_job_create_with_prio((callback_job_cb_t)send_packets,
this, NULL, (callback_job_cancel_t)return_false, JOB_PRIO_CRITICAL));
return &this->public;
}
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