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/*
* Copyright (c) 2002-2018 Balabit
* Copyright (c) 2018 Laszlo Budai <laszlo.budai@balabit.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "transport/multitransport.h"
#include "transport/transport-factory-registry.h"
#include "messages.h"
void multitransport_add_factory(MultiTransport *self, TransportFactory *transport_factory)
{
transport_factory_registry_add(self->registry, transport_factory);
}
static void
_do_transport_switch(MultiTransport *self, LogTransport *new_transport, const TransportFactory *new_transport_factory)
{
self->super.fd = log_transport_release_fd(self->active_transport);
self->super.cond = new_transport->cond;
/* At this point the proxy of the active transport must be released, and would be nice to handle the ownership passing here, but
* - the proxy is not in the LogTransport, it is socket only now, and
* - multitransport is a generic class, can handle none LogTransportSocket based transports
*/
log_transport_free(self->active_transport);
self->active_transport = new_transport;
self->active_transport_factory = new_transport_factory;
}
static const TransportFactory *
_lookup_transport_factory(TransportFactoryRegistry *registry, const TransportFactoryId *factory_id)
{
const TransportFactory *factory = transport_factory_registry_lookup(registry, factory_id);
if (!factory)
{
msg_error("Requested transport not found",
evt_tag_str("transport", transport_factory_id_get_transport_name(factory_id)));
return NULL;
}
return factory;
}
static LogTransport *
_construct_transport(const TransportFactory *factory, gint fd)
{
LogTransport *transport = transport_factory_construct_transport(factory, fd);
const TransportFactoryId *factory_id = transport_factory_get_id(factory);
if (!transport)
{
msg_error("Failed to construct transport",
evt_tag_str("transport", transport_factory_id_get_transport_name(factory_id)));
return NULL;
}
return transport;
}
gboolean multitransport_switch(MultiTransport *self, const TransportFactoryId *factory_id)
{
msg_debug("Transport switch requested",
evt_tag_str("active-transport", self->active_transport->name),
evt_tag_str("requested-transport", transport_factory_id_get_transport_name(factory_id)));
const TransportFactory *transport_factory = _lookup_transport_factory(self->registry, factory_id);
if (!transport_factory)
return FALSE;
LogTransport *transport = _construct_transport(transport_factory, self->super.fd);
if (!transport)
return FALSE;
_do_transport_switch(self, transport, transport_factory);
msg_debug("Transport switch succeeded",
evt_tag_str("new-active-transport", self->active_transport->name));
return TRUE;
}
gboolean
multitransport_contains_factory(MultiTransport *self, const TransportFactoryId *factory_id)
{
const TransportFactory *factory = transport_factory_registry_lookup(self->registry, factory_id);
return (factory != NULL);
}
static gssize
_multitransport_write(LogTransport *s, gpointer buf, gsize count)
{
MultiTransport *self = (MultiTransport *)s;
gssize r = log_transport_write(self->active_transport, buf, count);
self->super.cond = self->active_transport->cond;
return r;
}
static gssize
_multitransport_read(LogTransport *s, gpointer buf, gsize count, LogTransportAuxData *aux)
{
MultiTransport *self = (MultiTransport *)s;
gssize r = log_transport_read(self->active_transport, buf, count, aux);
self->super.cond = self->active_transport->cond;
return r;
}
static void
_multitransport_free(LogTransport *s)
{
MultiTransport *self = (MultiTransport *)s;
s->fd = log_transport_release_fd(self->active_transport);
log_transport_free(self->active_transport);
transport_factory_registry_free(self->registry);
log_transport_free_method(s);
}
LogTransport *
multitransport_new(TransportFactory *default_transport_factory, gint fd)
{
MultiTransport *self = g_new0(MultiTransport, 1);
self->registry = transport_factory_registry_new();
transport_factory_registry_add(self->registry, default_transport_factory);
log_transport_init_instance(&self->super, fd);
self->super.read = _multitransport_read;
self->super.write = _multitransport_write;
self->super.free_fn = _multitransport_free;
self->active_transport = transport_factory_construct_transport(default_transport_factory, fd);
self->active_transport_factory = default_transport_factory;
return &self->super;
}
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