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Annotation of embedaddon/strongswan/src/libcharon/plugins/farp/farp_plugin.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2010 Martin Willi
                      3:  * Copyright (C) 2010 revosec AG
                      4:  *
                      5:  * This program is free software; you can redistribute it and/or modify it
                      6:  * under the terms of the GNU General Public License as published by the
                      7:  * Free Software Foundation; either version 2 of the License, or (at your
                      8:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
                      9:  *
                     10:  * This program is distributed in the hope that it will be useful, but
                     11:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     12:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
                     13:  * for more details.
                     14:  */
                     15: 
                     16: #include "farp_plugin.h"
                     17: 
                     18: #include "farp_listener.h"
                     19: #include "farp_spoofer.h"
                     20: 
                     21: #include <daemon.h>
                     22: 
                     23: typedef struct private_farp_plugin_t private_farp_plugin_t;
                     24: 
                     25: /**
                     26:  * private data of farp plugin
                     27:  */
                     28: struct private_farp_plugin_t {
                     29: 
                     30:        /**
                     31:         * implements plugin interface
                     32:         */
                     33:        farp_plugin_t public;
                     34: 
                     35:        /**
                     36:         * Listener registering active virtual IPs
                     37:         */
                     38:        farp_listener_t *listener;
                     39: 
                     40:        /**
                     41:         * Spoofer listening and spoofing ARP messages
                     42:         */
                     43:        farp_spoofer_t *spoofer;
                     44: };
                     45: 
                     46: METHOD(plugin_t, get_name, char*,
                     47:        private_farp_plugin_t *this)
                     48: {
                     49:        return "farp";
                     50: }
                     51: 
                     52: /**
                     53:  * Register listener
                     54:  */
                     55: static bool plugin_cb(private_farp_plugin_t *this,
                     56:                                          plugin_feature_t *feature, bool reg, void *cb_data)
                     57: {
                     58:        if (reg)
                     59:        {
                     60:                charon->bus->add_listener(charon->bus, &this->listener->listener);
                     61:        }
                     62:        else
                     63:        {
                     64:                charon->bus->remove_listener(charon->bus, &this->listener->listener);
                     65:        }
                     66:        return TRUE;
                     67: }
                     68: 
                     69: METHOD(plugin_t, get_features, int,
                     70:        private_farp_plugin_t *this, plugin_feature_t *features[])
                     71: {
                     72:        static plugin_feature_t f[] = {
                     73:                PLUGIN_CALLBACK((plugin_feature_callback_t)plugin_cb, NULL),
                     74:                        PLUGIN_PROVIDE(CUSTOM, "farp"),
                     75:        };
                     76:        *features = f;
                     77:        return countof(f);
                     78: }
                     79: 
                     80: METHOD(plugin_t, destroy, void,
                     81:        private_farp_plugin_t *this)
                     82: {
                     83:        DESTROY_IF(this->spoofer);
                     84:        this->listener->destroy(this->listener);
                     85:        free(this);
                     86: }
                     87: 
                     88: /**
                     89:  * Plugin constructor
                     90:  */
                     91: plugin_t *farp_plugin_create()
                     92: {
                     93:        private_farp_plugin_t *this;
                     94: 
                     95:        if (!lib->caps->keep(lib->caps, CAP_NET_RAW))
                     96:        {       /* required to open ARP socket (AF_PACKET). according to capabilities(7)
                     97:                 * it is also require to use the socket */
                     98:                DBG1(DBG_NET, "farp plugin requires CAP_NET_RAW capability");
                     99:                return NULL;
                    100:        }
                    101: 
                    102:        INIT(this,
                    103:                .public = {
                    104:                        .plugin = {
                    105:                                .get_name = _get_name,
                    106:                                .get_features = _get_features,
                    107:                                .destroy = _destroy,
                    108:                        },
                    109:                },
                    110:                .listener = farp_listener_create(),
                    111:        );
                    112: 
                    113:        this->spoofer = farp_spoofer_create(this->listener);
                    114:        if (!this->spoofer)
                    115:        {
                    116:                destroy(this);
                    117:                return NULL;
                    118:        }
                    119:        return &this->public.plugin;
                    120: }