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