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/*
* Copyright (C) 2009 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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 "nm_handler.h"
#include <daemon.h>
typedef struct private_nm_handler_t private_nm_handler_t;
/**
* Private data of an nm_handler_t object.
*/
struct private_nm_handler_t {
/**
* Public nm_handler_t interface.
*/
nm_handler_t public;
/**
* list of received DNS server attributes, pointer to 4 byte data
*/
linked_list_t *dns;
/**
* list of received NBNS server attributes, pointer to 4 byte data
*/
linked_list_t *nbns;
};
/**
* Implementation of attribute_handler_t.handle
*/
static bool handle(private_nm_handler_t *this, identification_t *server,
configuration_attribute_type_t type, chunk_t data)
{
linked_list_t *list;
switch (type)
{
case INTERNAL_IP4_DNS:
list = this->dns;
break;
case INTERNAL_IP4_NBNS:
list = this->nbns;
break;
default:
return FALSE;
}
if (data.len != 4)
{
return FALSE;
}
list->insert_last(list, chunk_clone(data).ptr);
return TRUE;
}
/**
* Implementation of create_attribute_enumerator().enumerate() for WINS
*/
static bool enumerate_nbns(enumerator_t *this,
configuration_attribute_type_t *type, chunk_t *data)
{
*type = INTERNAL_IP4_NBNS;
*data = chunk_empty;
/* done */
this->enumerate = (void*)return_false;
return TRUE;
}
/**
* Implementation of create_attribute_enumerator().enumerate() for DNS
*/
static bool enumerate_dns(enumerator_t *this,
configuration_attribute_type_t *type, chunk_t *data)
{
*type = INTERNAL_IP4_DNS;
*data = chunk_empty;
/* enumerate WINS server as next attribute ... */
this->enumerate = (void*)enumerate_nbns;
return TRUE;
}
/**
* Implementation of attribute_handler_t.create_attribute_enumerator
*/
static enumerator_t* create_attribute_enumerator(private_nm_handler_t *this,
identification_t *server, host_t *vip)
{
if (vip && vip->get_family(vip) == AF_INET)
{ /* no IPv6 attributes yet */
enumerator_t *enumerator = malloc_thing(enumerator_t);
/* enumerate DNS attribute first ... */
enumerator->enumerate = (void*)enumerate_dns;
enumerator->destroy = (void*)free;
return enumerator;
}
return enumerator_create_empty();
}
/**
* convert plain byte ptrs to handy chunk during enumeration
*/
static bool filter_chunks(void* null, char **in, chunk_t *out)
{
*out = chunk_create(*in, 4);
return TRUE;
}
/**
* Implementation of nm_handler_t.create_enumerator
*/
static enumerator_t* create_enumerator(private_nm_handler_t *this,
configuration_attribute_type_t type)
{
linked_list_t *list;
switch (type)
{
case INTERNAL_IP4_DNS:
list = this->dns;
break;
case INTERNAL_IP4_NBNS:
list = this->nbns;
break;
default:
return enumerator_create_empty();
}
return enumerator_create_filter(list->create_enumerator(list),
(void*)filter_chunks, NULL, NULL);
}
/**
* Implementation of nm_handler_t.reset
*/
static void reset(private_nm_handler_t *this)
{
void *data;
while (this->dns->remove_last(this->dns, (void**)&data) == SUCCESS)
{
free(data);
}
while (this->nbns->remove_last(this->nbns, (void**)&data) == SUCCESS)
{
free(data);
}
}
/**
* Implementation of nm_handler_t.destroy.
*/
static void destroy(private_nm_handler_t *this)
{
reset(this);
this->dns->destroy(this->dns);
this->nbns->destroy(this->nbns);
free(this);
}
/**
* See header
*/
nm_handler_t *nm_handler_create()
{
private_nm_handler_t *this = malloc_thing(private_nm_handler_t);
this->public.handler.handle = (bool(*)(attribute_handler_t*, identification_t*, configuration_attribute_type_t, chunk_t))handle;
this->public.handler.release = (void(*)(attribute_handler_t*, identification_t*, configuration_attribute_type_t, chunk_t))nop;
this->public.handler.create_attribute_enumerator = (enumerator_t*(*)(attribute_handler_t*, identification_t *server, host_t *vip))create_attribute_enumerator;
this->public.create_enumerator = (enumerator_t*(*)(nm_handler_t*, configuration_attribute_type_t type))create_enumerator;
this->public.reset = (void(*)(nm_handler_t*))reset;
this->public.destroy = (void(*)(nm_handler_t*))destroy;
this->dns = linked_list_create();
this->nbns = linked_list_create();
return &this->public;
}
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