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/*
* Copyright (C) 2013 Tobias Brunner
* HSR Hochschule fuer Technik Rapperswil
*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* 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 "dhcp_plugin.h"
#include <daemon.h>
#include <plugins/plugin_feature.h>
#include "dhcp_socket.h"
#include "dhcp_provider.h"
typedef struct private_dhcp_plugin_t private_dhcp_plugin_t;
/**
* private data of dhcp plugin
*/
struct private_dhcp_plugin_t {
/**
* implements plugin interface
*/
dhcp_plugin_t public;
/**
* DHCP communication socket
*/
dhcp_socket_t *socket;
/**
* Attribute provider
*/
dhcp_provider_t *provider;
};
METHOD(plugin_t, get_name, char*,
private_dhcp_plugin_t *this)
{
return "dhcp";
}
/**
* Register listener
*/
static bool plugin_cb(private_dhcp_plugin_t *this,
plugin_feature_t *feature, bool reg, void *cb_data)
{
if (reg)
{
this->socket = dhcp_socket_create();
if (!this->socket)
{
return FALSE;
}
this->provider = dhcp_provider_create(this->socket);
charon->attributes->add_provider(charon->attributes,
&this->provider->provider);
}
else
{
charon->attributes->remove_provider(charon->attributes,
&this->provider->provider);
this->provider->destroy(this->provider);
this->socket->destroy(this->socket);
}
return TRUE;
}
METHOD(plugin_t, get_features, int,
private_dhcp_plugin_t *this, plugin_feature_t *features[])
{
static plugin_feature_t f[] = {
PLUGIN_CALLBACK((plugin_feature_callback_t)plugin_cb, NULL),
PLUGIN_PROVIDE(CUSTOM, "dhcp"),
PLUGIN_DEPENDS(RNG, RNG_WEAK),
};
*features = f;
return countof(f);
}
METHOD(plugin_t, destroy, void,
private_dhcp_plugin_t *this)
{
free(this);
}
/**
* Plugin constructor.
*/
plugin_t *dhcp_plugin_create()
{
private_dhcp_plugin_t *this;
if (!lib->caps->check(lib->caps, CAP_NET_BIND_SERVICE))
{ /* required to bind DHCP socket (port 68) */
DBG1(DBG_NET, "dhcp plugin requires CAP_NET_BIND_SERVICE capability");
return NULL;
}
else if (!lib->caps->keep(lib->caps, CAP_NET_RAW))
{ /* required to open DHCP receive socket (AF_PACKET). according to
* capabilities(7) it is also required to use the socket */
DBG1(DBG_NET, "dhcp plugin requires CAP_NET_RAW capability");
return NULL;
}
INIT(this,
.public = {
.plugin = {
.get_name = _get_name,
.get_features = _get_features,
.destroy = _destroy,
},
},
);
return &this->public.plugin;
}
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