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