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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 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 "dhcp_provider.h"
#include <utils/hashtable.h>
#include <threading/mutex.h>
typedef struct private_dhcp_provider_t private_dhcp_provider_t;
/**
* Private data of an dhcp_provider_t object.
*/
struct private_dhcp_provider_t {
/**
* Public dhcp_provider_t interface.
*/
dhcp_provider_t public;
/**
* Completed DHCP transactions
*/
hashtable_t *transactions;
/**
* Lock for transactions
*/
mutex_t *mutex;
/**
* DHCP communication socket
*/
dhcp_socket_t *socket;
};
/**
* Hashtable hash function
*/
static u_int hash(void *key)
{
return (uintptr_t)key;
}
/**
* Hashtable equals function
*/
static bool equals(void *a, void *b)
{
return a == b;
}
/**
* Hash ID and host to a key
*/
static uintptr_t hash_id_host(identification_t *id, host_t *host)
{
return chunk_hash_inc(id->get_encoding(id),
chunk_hash(host->get_address(host)));
}
/**
* Hash a DHCP transaction to a key, using address and id
*/
static uintptr_t hash_transaction(dhcp_transaction_t *transaction)
{
return hash_id_host(transaction->get_identity(transaction),
transaction->get_address(transaction));
}
METHOD(attribute_provider_t, acquire_address, host_t*,
private_dhcp_provider_t *this, char *pool,
identification_t *id, host_t *requested)
{
if (streq(pool, "dhcp"))
{
dhcp_transaction_t *transaction, *old;
host_t *vip;
transaction = this->socket->enroll(this->socket, id);
if (!transaction)
{
return NULL;
}
vip = transaction->get_address(transaction);
vip = vip->clone(vip);
this->mutex->lock(this->mutex);
old = this->transactions->put(this->transactions,
(void*)hash_transaction(transaction), transaction);
this->mutex->unlock(this->mutex);
DESTROY_IF(old);
return vip;
}
return NULL;
}
METHOD(attribute_provider_t, release_address, bool,
private_dhcp_provider_t *this, char *pool,
host_t *address, identification_t *id)
{
if (streq(pool, "dhcp"))
{
dhcp_transaction_t *transaction;
this->mutex->lock(this->mutex);
transaction = this->transactions->remove(this->transactions,
(void*)hash_id_host(id, address));
this->mutex->unlock(this->mutex);
if (transaction)
{
this->socket->release(this->socket, transaction);
transaction->destroy(transaction);
return TRUE;
}
}
return FALSE;
}
METHOD(attribute_provider_t, create_attribute_enumerator, enumerator_t*,
private_dhcp_provider_t *this, char *pool, identification_t *id,
host_t *vip)
{
dhcp_transaction_t *transaction;
if (!vip)
{
return NULL;
}
this->mutex->lock(this->mutex);
transaction = this->transactions->get(this->transactions,
(void*)hash_id_host(id, vip));
if (!transaction)
{
this->mutex->unlock(this->mutex);
return NULL;
}
return enumerator_create_cleaner(
transaction->create_attribute_enumerator(transaction),
(void*)this->mutex->unlock, this->mutex);
}
METHOD(dhcp_provider_t, destroy, void,
private_dhcp_provider_t *this)
{
enumerator_t *enumerator;
dhcp_transaction_t *value;
void *key;
enumerator = this->transactions->create_enumerator(this->transactions);
while (enumerator->enumerate(enumerator, &key, &value))
{
value->destroy(value);
}
enumerator->destroy(enumerator);
this->transactions->destroy(this->transactions);
this->mutex->destroy(this->mutex);
free(this);
}
/**
* See header
*/
dhcp_provider_t *dhcp_provider_create(dhcp_socket_t *socket)
{
private_dhcp_provider_t *this;
INIT(this,
.public = {
.provider = {
.acquire_address = _acquire_address,
.release_address = _release_address,
.create_attribute_enumerator = _create_attribute_enumerator,
},
.destroy = _destroy,
},
.socket = socket,
.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
.transactions = hashtable_create(hash, equals, 8),
);
return &this->public;
}
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