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/*
* Copyright (C) 2013 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* Copyright (C) 2012 Martin Willi
* Copyright (C) 2012 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "unity_provider.h"
#include <daemon.h>
#include <bio/bio_writer.h>
typedef struct private_unity_provider_t private_unity_provider_t;
/**
* Private data of an unity_provider_t object.
*/
struct private_unity_provider_t {
/**
* Public unity_provider_t interface.
*/
unity_provider_t public;
};
/**
* Attribute enumerator for UNITY_SPLIT_INCLUDE attribute
*/
typedef struct {
/** Implements enumerator_t */
enumerator_t public;
/** list of traffic selectors to enumerate */
linked_list_t *list;
/** attribute value */
chunk_t attr;
} attribute_enumerator_t;
/**
* Append data from the given traffic selector to the attribute data
*/
static void append_ts(bio_writer_t *writer, traffic_selector_t *ts)
{
host_t *net, *mask;
chunk_t padding;
u_int8_t bits;
if (!ts->to_subnet(ts, &net, &bits))
{
return;
}
mask = host_create_netmask(AF_INET, bits);
if (!mask)
{
net->destroy(net);
return;
}
writer->write_data(writer, net->get_address(net));
writer->write_data(writer, mask->get_address(mask));
/* the Cisco client parses the "padding" as protocol, src and dst port, the
* first two in network order the last in host order - no other clients seem
* to support these fields so we don't use them either */
padding = writer->skip(writer, 6);
memset(padding.ptr, 0, padding.len);
mask->destroy(mask);
net->destroy(net);
}
METHOD(enumerator_t, attribute_enumerate, bool,
attribute_enumerator_t *this, configuration_attribute_type_t *type,
chunk_t *attr)
{
traffic_selector_t *ts;
bio_writer_t *writer;
if (this->list->get_count(this->list) == 0)
{
return FALSE;
}
writer = bio_writer_create(14);
while (this->list->remove_first(this->list, (void**)&ts) == SUCCESS)
{
append_ts(writer, ts);
ts->destroy(ts);
}
*type = UNITY_SPLIT_INCLUDE;
*attr = this->attr = writer->extract_buf(writer);
writer->destroy(writer);
return TRUE;
}
METHOD(enumerator_t, attribute_destroy, void,
attribute_enumerator_t *this)
{
this->list->destroy_offset(this->list, offsetof(traffic_selector_t, destroy));
chunk_free(&this->attr);
free(this);
}
/**
* Check if we should send a configured TS as Split-Include attribute
*/
static bool use_ts(traffic_selector_t *ts)
{
u_int8_t mask;
host_t *net;
if (ts->get_type(ts) != TS_IPV4_ADDR_RANGE)
{
return FALSE;
}
if (ts->is_dynamic(ts))
{
return FALSE;
}
if (!ts->to_subnet(ts, &net, &mask))
{
return FALSE;
}
net->destroy(net);
return mask > 0;
}
METHOD(attribute_provider_t, create_attribute_enumerator, enumerator_t*,
private_unity_provider_t *this, linked_list_t *pools, identification_t *id,
linked_list_t *vips)
{
attribute_enumerator_t *attr_enum;
enumerator_t *enumerator;
linked_list_t *list, *current;
traffic_selector_t *ts;
ike_sa_t *ike_sa;
peer_cfg_t *peer_cfg;
child_cfg_t *child_cfg;
ike_sa = charon->bus->get_sa(charon->bus);
if (!ike_sa || ike_sa->get_version(ike_sa) != IKEV1 ||
!ike_sa->supports_extension(ike_sa, EXT_CISCO_UNITY) ||
!vips->get_count(vips))
{
return NULL;
}
list = linked_list_create();
peer_cfg = ike_sa->get_peer_cfg(ike_sa);
enumerator = peer_cfg->create_child_cfg_enumerator(peer_cfg);
while (enumerator->enumerate(enumerator, &child_cfg))
{
current = child_cfg->get_traffic_selectors(child_cfg, TRUE, NULL, NULL);
while (current->remove_first(current, (void**)&ts) == SUCCESS)
{
if (use_ts(ts))
{
list->insert_last(list, ts);
}
else
{
ts->destroy(ts);
}
}
current->destroy(current);
}
enumerator->destroy(enumerator);
if (list->get_count(list) == 0)
{
list->destroy(list);
return NULL;
}
DBG1(DBG_CFG, "sending %N: %#R",
configuration_attribute_type_names, UNITY_SPLIT_INCLUDE, list);
INIT(attr_enum,
.public = {
.enumerate = (void*)_attribute_enumerate,
.destroy = _attribute_destroy,
},
.list = list,
);
return &attr_enum->public;
}
METHOD(unity_provider_t, destroy, void,
private_unity_provider_t *this)
{
free(this);
}
/**
* See header
*/
unity_provider_t *unity_provider_create()
{
private_unity_provider_t *this;
INIT(this,
.public = {
.provider = {
.acquire_address = (void*)return_null,
.release_address = (void*)return_false,
.create_attribute_enumerator = _create_attribute_enumerator,
},
.destroy = _destroy,
},
);
return &this->public;
}
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