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-rw-r--r--src/libcharon/sa/mediation_manager.c341
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diff --git a/src/libcharon/sa/mediation_manager.c b/src/libcharon/sa/mediation_manager.c
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+++ b/src/libcharon/sa/mediation_manager.c
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+/*
+ * Copyright (C) 2007 Tobias Brunner
+ * 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 "mediation_manager.h"
+
+#include <daemon.h>
+#include <threading/mutex.h>
+#include <utils/linked_list.h>
+#include <processing/jobs/mediation_job.h>
+
+typedef struct peer_t peer_t;
+
+/**
+ * An entry in the linked list.
+ */
+struct peer_t {
+ /** id of the peer */
+ identification_t *id;
+
+ /** sa id of the peer, NULL if offline */
+ ike_sa_id_t *ike_sa_id;
+
+ /** list of peer ids that reuested this peer */
+ linked_list_t *requested_by;
+};
+
+/**
+ * Implementation of peer_t.destroy.
+ */
+static void peer_destroy(peer_t *this)
+{
+ DESTROY_IF(this->id);
+ DESTROY_IF(this->ike_sa_id);
+ this->requested_by->destroy_offset(this->requested_by,
+ offsetof(identification_t, destroy));
+ free(this);
+}
+
+/**
+ * Creates a new entry for the list.
+ */
+static peer_t *peer_create(identification_t *id, ike_sa_id_t* ike_sa_id)
+{
+ peer_t *this = malloc_thing(peer_t);
+
+ /* clone everything */
+ this->id = id->clone(id);
+ this->ike_sa_id = ike_sa_id ? ike_sa_id->clone(ike_sa_id) : NULL;
+ this->requested_by = linked_list_create();
+
+ return this;
+}
+
+typedef struct private_mediation_manager_t private_mediation_manager_t;
+
+/**
+ * Additional private members of mediation_manager_t.
+ */
+struct private_mediation_manager_t {
+ /**
+ * Public interface of mediation_manager_t.
+ */
+ mediation_manager_t public;
+
+ /**
+ * Lock for exclusivly accessing the manager.
+ */
+ mutex_t *mutex;
+
+ /**
+ * Linked list with state entries.
+ */
+ linked_list_t *peers;
+};
+
+/**
+ * Registers a peer's ID at another peer, if it is not yet registered
+ */
+static void register_peer(peer_t *peer, identification_t *peer_id)
+{
+ iterator_t *iterator;
+ identification_t *current;
+
+ iterator = peer->requested_by->create_iterator(peer->requested_by, TRUE);
+ while (iterator->iterate(iterator, (void**)&current))
+ {
+ if (peer_id->equals(peer_id, current))
+ {
+ iterator->destroy(iterator);
+ return;
+ }
+ }
+ iterator->destroy(iterator);
+
+ peer->requested_by->insert_last(peer->requested_by,
+ peer_id->clone(peer_id));
+}
+
+/**
+ * Get a peer_t object by a peer's id
+ */
+static status_t get_peer_by_id(private_mediation_manager_t *this,
+ identification_t *id, peer_t **peer)
+{
+ iterator_t *iterator;
+ peer_t *current;
+ status_t status = NOT_FOUND;
+
+ iterator = this->peers->create_iterator(this->peers, TRUE);
+ while (iterator->iterate(iterator, (void**)&current))
+ {
+ if (id->equals(id, current->id))
+ {
+ if (peer)
+ {
+ *peer = current;
+ }
+ status = SUCCESS;
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+
+ return status;
+}
+
+/**
+ * Check if a given peer is registered at other peers. If so, remove it there
+ * and then remove peers completely that are not online and have no registered
+ * peers.
+ */
+static void unregister_peer(private_mediation_manager_t *this,
+ identification_t *peer_id)
+{
+ iterator_t *iterator, *iterator_r;
+ peer_t *peer;
+ identification_t *registered;
+
+ iterator = this->peers->create_iterator(this->peers, TRUE);
+ while (iterator->iterate(iterator, (void**)&peer))
+ {
+ iterator_r = peer->requested_by->create_iterator(peer->requested_by,
+ TRUE);
+ while (iterator_r->iterate(iterator_r, (void**)&registered))
+ {
+ if (peer_id->equals(peer_id, registered))
+ {
+ iterator_r->remove(iterator_r);
+ registered->destroy(registered);
+ break;
+ }
+ }
+ iterator_r->destroy(iterator_r);
+
+ if (!peer->ike_sa_id && !peer->requested_by->get_count(peer->requested_by))
+ {
+ iterator->remove(iterator);
+ peer_destroy(peer);
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+}
+
+/**
+ * Implementation of mediation_manager_t.remove
+ */
+static void remove_sa(private_mediation_manager_t *this, ike_sa_id_t *ike_sa_id)
+{
+ iterator_t *iterator;
+ peer_t *peer;
+
+ this->mutex->lock(this->mutex);
+
+ iterator = this->peers->create_iterator(this->peers, TRUE);
+ while (iterator->iterate(iterator, (void**)&peer))
+ {
+ if (ike_sa_id->equals(ike_sa_id, peer->ike_sa_id))
+ {
+ iterator->remove(iterator);
+
+ unregister_peer(this, peer->id);
+
+ peer_destroy(peer);
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of mediation_manager_t.update_sa_id
+ */
+static void update_sa_id(private_mediation_manager_t *this, identification_t *peer_id, ike_sa_id_t *ike_sa_id)
+{
+ iterator_t *iterator;
+ peer_t *peer;
+ bool found = FALSE;
+
+ this->mutex->lock(this->mutex);
+
+ iterator = this->peers->create_iterator(this->peers, TRUE);
+ while (iterator->iterate(iterator, (void**)&peer))
+ {
+ if (peer_id->equals(peer_id, peer->id))
+ {
+ DESTROY_IF(peer->ike_sa_id);
+ found = TRUE;
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+
+ if (!found)
+ {
+ DBG2(DBG_IKE, "adding peer '%Y'", peer_id);
+ peer = peer_create(peer_id, NULL);
+ this->peers->insert_last(this->peers, peer);
+ }
+
+ DBG2(DBG_IKE, "changing registered IKE_SA ID of peer '%Y'", peer_id);
+ peer->ike_sa_id = ike_sa_id ? ike_sa_id->clone(ike_sa_id) : NULL;
+
+ /* send callbacks to registered peers */
+ identification_t *requester;
+ while(peer->requested_by->remove_last(peer->requested_by,
+ (void**)&requester) == SUCCESS)
+ {
+ job_t *job = (job_t*)mediation_callback_job_create(requester, peer_id);
+ charon->processor->queue_job(charon->processor, job);
+ requester->destroy(requester);
+ }
+
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of mediation_manager_t.check.
+ */
+static ike_sa_id_t *check(private_mediation_manager_t *this,
+ identification_t *peer_id)
+{
+ peer_t *peer;
+ ike_sa_id_t *ike_sa_id;
+
+ this->mutex->lock(this->mutex);
+
+ if (get_peer_by_id(this, peer_id, &peer) != SUCCESS)
+ {
+ this->mutex->unlock(this->mutex);
+ return NULL;
+ }
+
+ ike_sa_id = peer->ike_sa_id;
+
+ this->mutex->unlock(this->mutex);
+
+ return ike_sa_id;
+}
+
+/**
+ * Implementation of mediation_manager_t.check_and_register.
+ */
+static ike_sa_id_t *check_and_register(private_mediation_manager_t *this,
+ identification_t *peer_id, identification_t *requester)
+{
+ peer_t *peer;
+ ike_sa_id_t *ike_sa_id;
+
+ this->mutex->lock(this->mutex);
+
+ if (get_peer_by_id(this, peer_id, &peer) != SUCCESS)
+ {
+ DBG2(DBG_IKE, "adding peer %Y", peer_id);
+ peer = peer_create(peer_id, NULL);
+ this->peers->insert_last(this->peers, peer);
+ }
+
+ if (!peer->ike_sa_id)
+ {
+ /* the peer is not online */
+ DBG2(DBG_IKE, "requested peer '%Y' is offline, registering peer '%Y'",
+ peer_id, requester);
+ register_peer(peer, requester);
+ this->mutex->unlock(this->mutex);
+ return NULL;
+ }
+
+ ike_sa_id = peer->ike_sa_id;
+
+ this->mutex->unlock(this->mutex);
+
+ return ike_sa_id;
+}
+
+/**
+ * Implementation of mediation_manager_t.destroy.
+ */
+static void destroy(private_mediation_manager_t *this)
+{
+ this->mutex->lock(this->mutex);
+
+ this->peers->destroy_function(this->peers, (void*)peer_destroy);
+
+ this->mutex->unlock(this->mutex);
+ this->mutex->destroy(this->mutex);
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+mediation_manager_t *mediation_manager_create()
+{
+ private_mediation_manager_t *this = malloc_thing(private_mediation_manager_t);
+
+ this->public.destroy = (void(*)(mediation_manager_t*))destroy;
+ this->public.remove = (void(*)(mediation_manager_t*,ike_sa_id_t*))remove_sa;
+ this->public.update_sa_id = (void(*)(mediation_manager_t*,identification_t*,ike_sa_id_t*))update_sa_id;
+ this->public.check = (ike_sa_id_t*(*)(mediation_manager_t*,identification_t*))check;
+ this->public.check_and_register = (ike_sa_id_t*(*)(mediation_manager_t*,identification_t*,identification_t*))check_and_register;
+
+ this->peers = linked_list_create();
+ this->mutex = mutex_create(MUTEX_TYPE_DEFAULT);
+
+ return (mediation_manager_t*)this;
+}