www.pudn.com > strongswan-4.2.4.rar > backend_manager.c
/*
* Copyright (C) 2007 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 .
*
* 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.
*
* $Id: backend_manager.c 4044 2008-06-06 15:05:54Z martin $
*/
#include "backend_manager.h"
#include
#include
#include
#include
#include
typedef struct private_backend_manager_t private_backend_manager_t;
/**
* Private data of an backend_manager_t object.
*/
struct private_backend_manager_t {
/**
* Public part of backend_manager_t object.
*/
backend_manager_t public;
/**
* list of registered backends
*/
linked_list_t *backends;
/**
* locking mutex
*/
mutex_t *mutex;
};
/**
* data to pass nested IKE enumerator
*/
typedef struct {
private_backend_manager_t *this;
host_t *me;
host_t *other;
} ike_data_t;
/**
* data to pass nested peer enumerator
*/
typedef struct {
private_backend_manager_t *this;
identification_t *me;
identification_t *other;
} peer_data_t;
/**
* destroy IKE enumerator data and unlock list
*/
static void ike_enum_destroy(ike_data_t *data)
{
data->this->mutex->unlock(data->this->mutex);
free(data);
}
/**
* destroy PEER enumerator data and unlock list
*/
static void peer_enum_destroy(peer_data_t *data)
{
data->this->mutex->unlock(data->this->mutex);
free(data);
}
/**
* inner enumerator constructor for IKE cfgs
*/
static enumerator_t *ike_enum_create(backend_t *backend, ike_data_t *data)
{
return backend->create_ike_cfg_enumerator(backend, data->me, data->other);
}
/**
* inner enumerator constructor for Peer cfgs
*/
static enumerator_t *peer_enum_create(backend_t *backend, peer_data_t *data)
{
return backend->create_peer_cfg_enumerator(backend, data->me, data->other);
}
/**
* inner enumerator constructor for all Peer cfgs
*/
static enumerator_t *peer_enum_create_all(backend_t *backend)
{
return backend->create_peer_cfg_enumerator(backend, NULL, NULL);
}
/**
* implements backend_manager_t.get_ike_cfg.
*/
static ike_cfg_t *get_ike_cfg(private_backend_manager_t *this,
host_t *me, host_t *other)
{
ike_cfg_t *current, *found = NULL;
enumerator_t *enumerator;
host_t *my_candidate, *other_candidate;
ike_data_t *data;
enum {
MATCH_NONE = 0x00,
MATCH_ANY = 0x01,
MATCH_ME = 0x04,
MATCH_OTHER = 0x08,
} prio, best = MATCH_ANY;
data = malloc_thing(ike_data_t);
data->this = this;
data->me = me;
data->other = other;
DBG2(DBG_CFG, "looking for a config for %H...%H", me, other);
this->mutex->lock(this->mutex);
enumerator = enumerator_create_nested(
this->backends->create_enumerator(this->backends),
(void*)ike_enum_create, data, (void*)ike_enum_destroy);
while (enumerator->enumerate(enumerator, (void**)¤t))
{
prio = MATCH_NONE;
my_candidate = host_create_from_dns(current->get_my_addr(current),
me->get_family(me), 0);
if (!my_candidate)
{
continue;
}
if (my_candidate->ip_equals(my_candidate, me))
{
prio += MATCH_ME;
}
else if (my_candidate->is_anyaddr(my_candidate))
{
prio += MATCH_ANY;
}
my_candidate->destroy(my_candidate);
other_candidate = host_create_from_dns(current->get_other_addr(current),
other->get_family(other), 0);
if (!other_candidate)
{
continue;
}
if (other_candidate->ip_equals(other_candidate, other))
{
prio += MATCH_OTHER;
}
else if (other_candidate->is_anyaddr(other_candidate))
{
prio += MATCH_ANY;
}
other_candidate->destroy(other_candidate);
DBG2(DBG_CFG, " candidate: %s...%s, prio %d",
current->get_my_addr(current), current->get_other_addr(current),
prio);
/* we require at least two MATCH_ANY */
if (prio > best)
{
best = prio;
DESTROY_IF(found);
found = current;
found->get_ref(found);
}
}
enumerator->destroy(enumerator);
this->mutex->unlock(this->mutex);
return found;
}
static enumerator_t *create_peer_cfg_enumerator(private_backend_manager_t *this)
{
this->mutex->lock(this->mutex);
return enumerator_create_nested(
this->backends->create_enumerator(this->backends),
(void*)peer_enum_create_all, this->mutex,
(void*)this->mutex->unlock);
}
/**
* implements backend_manager_t.get_peer_cfg.
*/
static peer_cfg_t *get_peer_cfg(private_backend_manager_t *this,
identification_t *me, identification_t *other,
auth_info_t *auth)
{
peer_cfg_t *current, *found = NULL;
enumerator_t *enumerator;
identification_t *my_candidate, *other_candidate;
id_match_t best = ID_MATCH_NONE;
peer_data_t *data;
DBG2(DBG_CFG, "looking for a config for %D...%D", me, other);
data = malloc_thing(peer_data_t);
data->this = this;
data->me = me;
data->other = other;
this->mutex->lock(this->mutex);
enumerator = enumerator_create_nested(
this->backends->create_enumerator(this->backends),
(void*)peer_enum_create, data, (void*)peer_enum_destroy);
while (enumerator->enumerate(enumerator, ¤t))
{
id_match_t m1, m2, sum;
my_candidate = current->get_my_id(current);
other_candidate = current->get_other_id(current);
/* own ID may have wildcards in both, config and request (missing IDr) */
m1 = my_candidate->matches(my_candidate, me);
if (!m1)
{
m1 = me->matches(me, my_candidate);
}
m2 = other->matches(other, other_candidate);
sum = m1 + m2;
if (m1 && m2)
{
if (auth->complies(auth, current->get_auth(current)))
{
DBG2(DBG_CFG, " candidate '%s': %D...%D, prio %d",
current->get_name(current), my_candidate,
other_candidate, sum);
if (sum > best)
{
DESTROY_IF(found);
found = current;
found->get_ref(found);
best = sum;
}
}
}
}
if (found)
{
DBG1(DBG_CFG, "found matching config \"%s\": %D...%D, prio %d",
found->get_name(found), found->get_my_id(found),
found->get_other_id(found), best);
}
enumerator->destroy(enumerator);
this->mutex->unlock(this->mutex);
return found;
}
/**
* implements backend_manager_t.get_peer_cfg_by_name.
*/
static peer_cfg_t *get_peer_cfg_by_name(private_backend_manager_t *this, char *name)
{
backend_t *backend;
peer_cfg_t *config = NULL;
enumerator_t *enumerator;
this->mutex->lock(this->mutex);
enumerator = this->backends->create_enumerator(this->backends);
while (config == NULL && enumerator->enumerate(enumerator, (void**)&backend))
{
config = backend->get_peer_cfg_by_name(backend, name);
}
enumerator->destroy(enumerator);
this->mutex->unlock(this->mutex);
return config;
}
/**
* Implementation of backend_manager_t.remove_backend.
*/
static void remove_backend(private_backend_manager_t *this, backend_t *backend)
{
this->mutex->lock(this->mutex);
this->backends->remove(this->backends, backend, NULL);
this->mutex->unlock(this->mutex);
}
/**
* Implementation of backend_manager_t.add_backend.
*/
static void add_backend(private_backend_manager_t *this, backend_t *backend)
{
this->mutex->lock(this->mutex);
this->backends->insert_last(this->backends, backend);
this->mutex->unlock(this->mutex);
}
/**
* Implementation of backend_manager_t.destroy.
*/
static void destroy(private_backend_manager_t *this)
{
this->backends->destroy(this->backends);
this->mutex->destroy(this->mutex);
free(this);
}
/*
* Described in header-file
*/
backend_manager_t *backend_manager_create()
{
private_backend_manager_t *this = malloc_thing(private_backend_manager_t);
this->public.get_ike_cfg = (ike_cfg_t* (*)(backend_manager_t*, host_t*, host_t*))get_ike_cfg;
this->public.get_peer_cfg = (peer_cfg_t* (*)(backend_manager_t*,identification_t*,identification_t*,auth_info_t*))get_peer_cfg;
this->public.get_peer_cfg_by_name = (peer_cfg_t* (*)(backend_manager_t*,char*))get_peer_cfg_by_name;
this->public.create_peer_cfg_enumerator = (enumerator_t* (*)(backend_manager_t*))create_peer_cfg_enumerator;
this->public.add_backend = (void(*)(backend_manager_t*, backend_t *backend))add_backend;
this->public.remove_backend = (void(*)(backend_manager_t*, backend_t *backend))remove_backend;
this->public.destroy = (void (*)(backend_manager_t*))destroy;
this->backends = linked_list_create();
this->mutex = mutex_create(MUTEX_RECURSIVE);
return &this->public;
}