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: }
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