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Annotation of embedaddon/strongswan/src/libcharon/plugins/dhcp/dhcp_plugin.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2013 Tobias Brunner
                      3:  * HSR Hochschule fuer Technik Rapperswil
                      4:  *
                      5:  * Copyright (C) 2010 Martin Willi
                      6:  * Copyright (C) 2010 revosec AG
                      7:  *
                      8:  * This program is free software; you can redistribute it and/or modify it
                      9:  * under the terms of the GNU General Public License as published by the
                     10:  * Free Software Foundation; either version 2 of the License, or (at your
                     11:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
                     12:  *
                     13:  * This program is distributed in the hope that it will be useful, but
                     14:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     15:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
                     16:  * for more details.
                     17:  */
                     18: 
                     19: #include "dhcp_plugin.h"
                     20: 
                     21: #include <daemon.h>
                     22: #include <plugins/plugin_feature.h>
                     23: 
                     24: #include "dhcp_socket.h"
                     25: #include "dhcp_provider.h"
                     26: 
                     27: typedef struct private_dhcp_plugin_t private_dhcp_plugin_t;
                     28: 
                     29: /**
                     30:  * private data of dhcp plugin
                     31:  */
                     32: struct private_dhcp_plugin_t {
                     33: 
                     34:        /**
                     35:         * implements plugin interface
                     36:         */
                     37:        dhcp_plugin_t public;
                     38: 
                     39:        /**
                     40:         * DHCP communication socket
                     41:         */
                     42:        dhcp_socket_t *socket;
                     43: 
                     44:        /**
                     45:         * Attribute provider
                     46:         */
                     47:        dhcp_provider_t *provider;
                     48: };
                     49: 
                     50: METHOD(plugin_t, get_name, char*,
                     51:        private_dhcp_plugin_t *this)
                     52: {
                     53:        return "dhcp";
                     54: }
                     55: 
                     56: /**
                     57:  * Register listener
                     58:  */
                     59: static bool plugin_cb(private_dhcp_plugin_t *this,
                     60:                                          plugin_feature_t *feature, bool reg, void *cb_data)
                     61: {
                     62:        if (reg)
                     63:        {
                     64:                this->socket = dhcp_socket_create();
                     65: 
                     66:                if (!this->socket)
                     67:                {
                     68:                        return FALSE;
                     69:                }
                     70:                this->provider = dhcp_provider_create(this->socket);
                     71:                charon->attributes->add_provider(charon->attributes,
                     72:                                                                                 &this->provider->provider);
                     73:        }
                     74:        else
                     75:        {
                     76:                charon->attributes->remove_provider(charon->attributes,
                     77:                                                                                        &this->provider->provider);
                     78:                this->provider->destroy(this->provider);
                     79:                this->socket->destroy(this->socket);
                     80:        }
                     81:        return TRUE;
                     82: }
                     83: 
                     84: METHOD(plugin_t, get_features, int,
                     85:        private_dhcp_plugin_t *this, plugin_feature_t *features[])
                     86: {
                     87:        static plugin_feature_t f[] = {
                     88:                PLUGIN_CALLBACK((plugin_feature_callback_t)plugin_cb, NULL),
                     89:                        PLUGIN_PROVIDE(CUSTOM, "dhcp"),
                     90:                                PLUGIN_DEPENDS(RNG, RNG_WEAK),
                     91:        };
                     92:        *features = f;
                     93:        return countof(f);
                     94: }
                     95: 
                     96: METHOD(plugin_t, destroy, void,
                     97:        private_dhcp_plugin_t *this)
                     98: {
                     99:        free(this);
                    100: }
                    101: 
                    102: /**
                    103:  * Plugin constructor.
                    104:  */
                    105: plugin_t *dhcp_plugin_create()
                    106: {
                    107:        private_dhcp_plugin_t *this;
                    108: 
                    109:        if (!lib->caps->check(lib->caps, CAP_NET_BIND_SERVICE))
                    110:        {       /* required to bind DHCP socket (port 68) */
                    111:                DBG1(DBG_NET, "dhcp plugin requires CAP_NET_BIND_SERVICE capability");
                    112:                return NULL;
                    113:        }
                    114:        else if (!lib->caps->keep(lib->caps, CAP_NET_RAW))
                    115:        {       /* required to open DHCP receive socket (AF_PACKET). according to
                    116:                 * capabilities(7) it is also required to use the socket */
                    117:                DBG1(DBG_NET, "dhcp plugin requires CAP_NET_RAW capability");
                    118:                return NULL;
                    119:        }
                    120: 
                    121:        INIT(this,
                    122:                .public = {
                    123:                        .plugin = {
                    124:                                .get_name = _get_name,
                    125:                                .get_features = _get_features,
                    126:                                .destroy = _destroy,
                    127:                        },
                    128:                },
                    129:        );
                    130: 
                    131:        return &this->public.plugin;
                    132: }