New upstream release.

1 files changed, 1623 insertions, 0 deletions

diff --git a/src/libcharon/sa/connect_manager.c b/src/libcharon/sa/connect_manager.c
new file mode 100644
index 000000000..b78ba070d
--- /dev/null
+++ b/src/libcharon/sa/connect_manager.c
@@ -0,0 +1,1623 @@
+/*
+ * Copyright (C) 2007-2008 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 "connect_manager.h"
+
+#include <math.h>
+
+#include <daemon.h>
+#include <threading/mutex.h>
+#include <utils/linked_list.h>
+#include <crypto/hashers/hasher.h>
+
+#include <processing/jobs/callback_job.h>
+#include <processing/jobs/initiate_mediation_job.h>
+#include <encoding/payloads/endpoint_notify.h>
+
+/* base timeout
+ * the check interval is ME_INTERVAL */
+#define ME_INTERVAL 25 /* ms */
+/* retransmission timeout is first ME_INTERVAL for ME_BOOST retransmissions
+ * then gets reduced to ME_INTERVAL * ME_RETRANS_BASE ^ (sent retransmissions - ME_BOOST). */
+/* number of initial retransmissions sent in short interval */
+#define ME_BOOST 2
+/* base for retransmissions */
+#define ME_RETRANS_BASE 1.8
+/* max number of retransmissions */
+#define ME_MAX_RETRANS 13
+
+/* time to wait before the initiator finishes the connectivity checks after
+ * the first check has succeeded */
+#define ME_WAIT_TO_FINISH 1000 /* ms */
+
+typedef struct private_connect_manager_t private_connect_manager_t;
+
+/**
+ * Additional private members of connect_manager_t.
+ */
+struct private_connect_manager_t {
+	/**
+	 * Public interface of connect_manager_t.
+	 */
+	 connect_manager_t public;
+
+	 /**
+	  * Lock for exclusivly accessing the manager.
+	  */
+	 mutex_t *mutex;
+
+	 /**
+	  * Hasher to generate signatures
+	  */
+	 hasher_t *hasher;
+
+	 /**
+	  * Linked list with initiated mediated connections
+	  */
+	 linked_list_t *initiated;
+
+	 /**
+	  * Linked list with checklists (hash table with connect ID as key would
+	  * be better).
+	  */
+	 linked_list_t *checklists;
+};
+
+typedef enum check_state_t check_state_t;
+
+enum check_state_t {
+	CHECK_NONE,
+	CHECK_WAITING,
+	CHECK_IN_PROGRESS,
+	CHECK_SUCCEEDED,
+	CHECK_FAILED
+};
+
+typedef struct endpoint_pair_t endpoint_pair_t;
+
+/**
+ * An entry in the check list.
+ */
+struct endpoint_pair_t {
+	/** pair id */
+	u_int32_t id;
+
+	/** priority */
+	u_int64_t priority;
+
+	/** local endpoint */
+	host_t *local;
+
+	/** remote endpoint */
+	host_t *remote;
+
+	/** state */
+	check_state_t state;
+
+	/** number of retransmissions */
+	u_int32_t retransmitted;
+
+	/** the generated packet */
+	packet_t *packet;
+};
+
+/**
+ * Destroys an endpoint pair
+ */
+static void endpoint_pair_destroy(endpoint_pair_t *this)
+{
+	DESTROY_IF(this->local);
+	DESTROY_IF(this->remote);
+	DESTROY_IF(this->packet);
+	free(this);
+}
+
+/**
+ * Creates a new entry for the list.
+ */
+static endpoint_pair_t *endpoint_pair_create(endpoint_notify_t *initiator,
+		endpoint_notify_t *responder, bool initiator_is_local)
+{
+	endpoint_pair_t *this = malloc_thing(endpoint_pair_t);
+
+	this->id = 0;
+
+	u_int32_t pi = initiator->get_priority(initiator);
+	u_int32_t pr = responder->get_priority(responder);
+	this->priority = pow(2, 32) * min(pi, pr) + 2 * max(pi, pr) + (pi > pr ? 1 : 0);
+
+	this->local = initiator_is_local ? initiator->get_base(initiator)
+									 : responder->get_base(responder);
+	this->local = this->local->clone(this->local);
+	this->remote = initiator_is_local ? responder->get_host(responder)
+									  : initiator->get_host(initiator);
+	this->remote = this->remote->clone(this->remote);
+
+	this->state = CHECK_WAITING;
+	this->retransmitted = 0;
+	this->packet = NULL;
+
+	return this;
+}
+
+
+typedef struct check_list_t check_list_t;
+
+/**
+ * An entry in the linked list.
+ */
+struct check_list_t {
+
+	struct {
+		/** initiator's id */
+		identification_t *id;
+
+		/** initiator's key */
+		chunk_t key;
+
+		/** initiator's endpoints */
+		linked_list_t *endpoints;
+	} initiator;
+
+	struct {
+		/** responder's id */
+		identification_t *id;
+
+		/** responder's key */
+		chunk_t key;
+
+		/** responder's endpoints */
+		linked_list_t *endpoints;
+	} responder;
+
+	/** connect id */
+	chunk_t connect_id;
+
+	/** list of endpoint pairs */
+	linked_list_t *pairs;
+
+	/** pairs queued for triggered checks */
+	linked_list_t *triggered;
+
+	/** state */
+	check_state_t state;
+
+	/** TRUE if this is the initiator */
+	bool is_initiator;
+
+	/** TRUE if the initiator is finishing the checks */
+	bool is_finishing;
+
+	/** the current sender job */
+	job_t *sender;
+
+};
+
+/**
+ * Destroys a checklist
+ */
+static void check_list_destroy(check_list_t *this)
+{
+	DESTROY_IF(this->initiator.id);
+	DESTROY_IF(this->responder.id);
+
+	chunk_free(&this->connect_id);
+	chunk_free(&this->initiator.key);
+	chunk_free(&this->responder.key);
+
+	DESTROY_OFFSET_IF(this->initiator.endpoints,
+					  offsetof(endpoint_notify_t, destroy));
+	DESTROY_OFFSET_IF(this->responder.endpoints,
+					  offsetof(endpoint_notify_t, destroy));
+
+	DESTROY_FUNCTION_IF(this->pairs, (void*)endpoint_pair_destroy);
+	/* this list contains some of the elements contained in this->pairs */
+	DESTROY_IF(this->triggered);
+
+	free(this);
+}
+
+/**
+ * Creates a new checklist
+ */
+static check_list_t *check_list_create(identification_t *initiator,
+									   identification_t *responder,
+									   chunk_t connect_id,
+									   chunk_t initiator_key,
+									   linked_list_t *initiator_endpoints,
+									   bool is_initiator)
+{
+	check_list_t *this = malloc_thing(check_list_t);
+
+	this->connect_id = chunk_clone(connect_id);
+
+	this->initiator.id = initiator->clone(initiator);
+	this->initiator.key = chunk_clone(initiator_key);
+	this->initiator.endpoints = initiator_endpoints->clone_offset(initiator_endpoints, offsetof(endpoint_notify_t, clone));
+
+	this->responder.id = responder->clone(responder);
+	this->responder.key = chunk_empty;
+	this->responder.endpoints = NULL;
+
+	this->pairs = linked_list_create();
+	this->triggered = linked_list_create();
+	this->state = CHECK_NONE;
+	this->is_initiator = is_initiator;
+	this->is_finishing = FALSE;
+
+	return this;
+}
+
+typedef struct initiated_t initiated_t;
+
+/**
+ * For an initiator, the data stored about initiated mediation connections
+ */
+struct initiated_t {
+	/** my id */
+	identification_t *id;
+
+	/** peer id */
+	identification_t *peer_id;
+
+	/** list of mediated sas */
+	linked_list_t *mediated;
+};
+
+/**
+ * Destroys a queued initiation
+ */
+static void initiated_destroy(initiated_t *this)
+{
+	DESTROY_IF(this->id);
+	DESTROY_IF(this->peer_id);
+	this->mediated->destroy_offset(this->mediated,
+								   offsetof(ike_sa_id_t, destroy));
+	free(this);
+}
+
+/**
+ * Creates a queued initiation
+ */
+static initiated_t *initiated_create(identification_t *id,
+									 identification_t *peer_id)
+{
+	initiated_t *this = malloc_thing(initiated_t);
+
+	this->id = id->clone(id);
+	this->peer_id = peer_id->clone(peer_id);
+	this->mediated = linked_list_create();
+
+	return this;
+}
+
+
+typedef struct check_t check_t;
+
+/**
+ * Data exchanged in a connectivity check
+ */
+struct check_t {
+	/** message id */
+	u_int32_t mid;
+
+	/** source of the connectivity check */
+	host_t *src;
+
+	/** destination of the connectivity check */
+	host_t *dst;
+
+	/** connect id */
+	chunk_t connect_id;
+
+	/** endpoint */
+	endpoint_notify_t *endpoint;
+
+	/** raw endpoint payload (to verify the signature) */
+	chunk_t endpoint_raw;
+
+	/** connect auth */
+	chunk_t auth;
+};
+
+/**
+ * Destroys a connectivity check
+ */
+static void check_destroy(check_t *this)
+{
+	chunk_free(&this->connect_id);
+	chunk_free(&this->endpoint_raw);
+	chunk_free(&this->auth);
+	DESTROY_IF(this->src);
+	DESTROY_IF(this->dst);
+	DESTROY_IF(this->endpoint);
+	free(this);
+}
+
+/**
+ * Creates a new connectivity check
+ */
+static check_t *check_create()
+{
+	check_t *this = malloc_thing(check_t);
+
+	this->connect_id = chunk_empty;
+	this->auth = chunk_empty;
+	this->endpoint_raw = chunk_empty;
+	this->src = NULL;
+	this->dst = NULL;
+	this->endpoint = NULL;
+
+	this->mid = 0;
+
+	return this;
+}
+
+typedef struct callback_data_t callback_data_t;
+
+/**
+ * Data required by several callback jobs used in this file
+ */
+struct callback_data_t {
+	/** connect manager */
+	private_connect_manager_t *connect_manager;
+
+	/** connect id */
+	chunk_t connect_id;
+
+	/** message (pair) id */
+	u_int32_t mid;
+};
+
+/**
+ * Destroys a callback data object
+ */
+static void callback_data_destroy(callback_data_t *this)
+{
+	chunk_free(&this->connect_id);
+	free(this);
+}
+
+/**
+ * Creates a new callback data object
+ */
+static callback_data_t *callback_data_create(private_connect_manager_t *connect_manager,
+											 chunk_t connect_id)
+{
+	callback_data_t *this = malloc_thing(callback_data_t);
+	this->connect_manager = connect_manager;
+	this->connect_id = chunk_clone(connect_id);
+	this->mid = 0;
+	return this;
+}
+
+/**
+ * Creates a new retransmission data object
+ */
+static callback_data_t *retransmit_data_create(private_connect_manager_t *connect_manager,
+											   chunk_t connect_id, u_int32_t mid)
+{
+	callback_data_t *this = callback_data_create(connect_manager, connect_id);
+	this->mid = mid;
+	return this;
+}
+
+typedef struct initiate_data_t initiate_data_t;
+
+/**
+ * Data required by the initiate mediated
+ */
+struct initiate_data_t {
+	/** checklist */
+	check_list_t *checklist;
+
+	/** waiting mediated connections */
+	initiated_t *initiated;
+};
+
+/**
+ * Destroys a initiate data object
+ */
+static void initiate_data_destroy(initiate_data_t *this)
+{
+	check_list_destroy(this->checklist);
+	initiated_destroy(this->initiated);
+	free(this);
+}
+
+/**
+ * Creates a new initiate data object
+ */
+static initiate_data_t *initiate_data_create(check_list_t *checklist,
+											 initiated_t *initiated)
+{
+	initiate_data_t *this = malloc_thing(initiate_data_t);
+
+	this->checklist = checklist;
+	this->initiated = initiated;
+
+	return this;
+}
+
+/**
+ * Find an initiated connection by the peers' ids
+ */
+static bool match_initiated_by_ids(initiated_t *current, identification_t *id,
+								   identification_t *peer_id)
+{
+	return id->equals(id, current->id) && peer_id->equals(peer_id, current->peer_id);
+}
+
+static status_t get_initiated_by_ids(private_connect_manager_t *this,
+									 identification_t *id,
+									 identification_t *peer_id,
+									 initiated_t **initiated)
+{
+	return this->initiated->find_first(this->initiated,
+								(linked_list_match_t)match_initiated_by_ids,
+								(void**)initiated, id, peer_id);
+}
+
+/**
+ * Removes data about initiated connections
+ */
+static void remove_initiated(private_connect_manager_t *this,
+							 initiated_t *initiated)
+{
+	iterator_t *iterator;
+	initiated_t *current;
+
+	iterator = this->initiated->create_iterator(this->initiated, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current == initiated)
+		{
+			iterator->remove(iterator);
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Find the checklist with a specific connect ID
+ */
+static bool match_checklist_by_id(check_list_t *current, chunk_t *connect_id)
+{
+	return chunk_equals(*connect_id, current->connect_id);
+}
+
+static status_t get_checklist_by_id(private_connect_manager_t *this,
+									chunk_t connect_id,
+									check_list_t **check_list)
+{
+	return this->checklists->find_first(this->checklists,
+								(linked_list_match_t)match_checklist_by_id,
+								(void**)check_list, &connect_id);
+}
+
+/**
+ * Removes a checklist
+ */
+static void remove_checklist(private_connect_manager_t *this,
+							 check_list_t *checklist)
+{
+	iterator_t *iterator;
+	check_list_t *current;
+
+	iterator = this->checklists->create_iterator(this->checklists, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current == checklist)
+		{
+			iterator->remove(iterator);
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Checks if a list of endpoint_notify_t contains a certain host_t
+ */
+static bool match_endpoint_by_host(endpoint_notify_t *current, host_t *host)
+{
+	return host->equals(host, current->get_host(current));
+}
+
+static status_t endpoints_contain(linked_list_t *endpoints, host_t *host,
+								  endpoint_notify_t **endpoint)
+{
+	return endpoints->find_first(endpoints,
+								 (linked_list_match_t)match_endpoint_by_host,
+								 (void**)endpoint, host);
+}
+
+/**
+ * Inserts an endpoint pair into a list of pairs ordered by priority (high to low)
+ */
+static void insert_pair_by_priority(linked_list_t *pairs, endpoint_pair_t *pair)
+{
+	iterator_t *iterator;
+	endpoint_pair_t *current;
+	bool inserted = FALSE;
+
+	iterator = pairs->create_iterator(pairs, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current->priority < pair->priority)
+		{
+			iterator->insert_before(iterator, pair);
+			inserted = TRUE;
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	if (!inserted)
+	{
+		pairs->insert_last(pairs, pair);
+	}
+}
+
+/**
+ * Searches a list of endpoint_pair_t for a pair with specific host_ts
+ */
+static bool match_pair_by_hosts(endpoint_pair_t *current, host_t *local,
+								host_t *remote)
+{
+	return local->equals(local, current->local) && remote->equals(remote, current->remote);
+}
+
+static status_t get_pair_by_hosts(linked_list_t *pairs, host_t *local,
+								  host_t *remote, endpoint_pair_t **pair)
+{
+	return pairs->find_first(pairs, (linked_list_match_t)match_pair_by_hosts,
+							 (void**)pair, local, remote);
+}
+
+static bool match_pair_by_id(endpoint_pair_t *current, u_int32_t *id)
+{
+	return current->id == *id;
+}
+
+/**
+ * Searches for a pair with a specific id
+ */
+static status_t get_pair_by_id(check_list_t *checklist, u_int32_t id,
+							   endpoint_pair_t **pair)
+{
+	return checklist->pairs->find_first(checklist->pairs,
+										(linked_list_match_t)match_pair_by_id,
+										(void**)pair, &id);
+}
+
+static bool match_succeeded_pair(endpoint_pair_t *current)
+{
+	return current->state == CHECK_SUCCEEDED;
+}
+
+/**
+ * Returns the best pair of state CHECK_SUCCEEDED from a checklist.
+ */
+static status_t get_best_valid_pair(check_list_t *checklist,
+									endpoint_pair_t **pair)
+{
+	return checklist->pairs->find_first(checklist->pairs,
+									(linked_list_match_t)match_succeeded_pair,
+									(void**)pair);
+}
+
+static bool match_waiting_pair(endpoint_pair_t *current)
+{
+	return current->state == CHECK_WAITING;
+}
+
+/**
+ * Returns and *removes* the first triggered pair in state CHECK_WAITING.
+ */
+static status_t get_triggered_pair(check_list_t *checklist,
+								   endpoint_pair_t **pair)
+{
+	iterator_t *iterator;
+	endpoint_pair_t *current;
+	status_t status = NOT_FOUND;
+
+	iterator = checklist->triggered->create_iterator(checklist->triggered, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		iterator->remove(iterator);
+
+		if (current->state == CHECK_WAITING)
+		{
+			if (pair)
+			{
+				*pair = current;
+			}
+			status = SUCCESS;
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	return status;
+}
+
+/**
+ * Prints all the pairs on a checklist
+ */
+static void print_checklist(check_list_t *checklist)
+{
+	iterator_t *iterator;
+	endpoint_pair_t *current;
+
+	DBG1(DBG_IKE, "pairs on checklist %#B:", &checklist->connect_id);
+	iterator = checklist->pairs->create_iterator(checklist->pairs, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		DBG1(DBG_IKE, " * %#H - %#H (%d)", current->local, current->remote,
+			 current->priority);
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Prunes identical pairs with lower priority from the list
+ * Note: this function also numbers the remaining pairs serially
+ */
+static void prune_pairs(linked_list_t *pairs)
+{
+	iterator_t *iterator, *search;
+	endpoint_pair_t *current, *other;
+	u_int32_t id = 0;
+
+	iterator = pairs->create_iterator(pairs, TRUE);
+	search = pairs->create_iterator(pairs, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		current->id = ++id;
+
+		while (search->iterate(search, (void**)&other))
+		{
+			if (current == other)
+			{
+				continue;
+			}
+
+			if (current->local->equals(current->local, other->local) &&
+				current->remote->equals(current->remote, other->remote))
+			{
+				/* since the list of pairs is sorted by priority in descending
+				 * order, and we iterate the list from the beginning, we are
+				 * sure that the priority of 'other' is lower than that of
+				 * 'current', remove it */
+				DBG1(DBG_IKE, "pruning endpoint pair %#H - %#H with priority %d",
+					 other->local, other->remote, other->priority);
+				search->remove(search);
+				endpoint_pair_destroy(other);
+			}
+		}
+		search->reset(search);
+	}
+	search->destroy(search);
+	iterator->destroy(iterator);
+}
+
+/**
+ * Builds a list of endpoint pairs
+ */
+static void build_pairs(check_list_t *checklist)
+{
+	/* FIXME: limit endpoints and pairs */
+	iterator_t *iterator_i, *iterator_r;
+	endpoint_notify_t *initiator, *responder;
+
+	iterator_i = checklist->initiator.endpoints->create_iterator(
+										checklist->initiator.endpoints, TRUE);
+	while (iterator_i->iterate(iterator_i, (void**)&initiator))
+	{
+		iterator_r = checklist->responder.endpoints->create_iterator(
+										checklist->responder.endpoints, TRUE);
+		while (iterator_r->iterate(iterator_r, (void**)&responder))
+		{
+			if (initiator->get_family(initiator) != responder->get_family(responder))
+			{
+				continue;
+			}
+
+			insert_pair_by_priority(checklist->pairs, endpoint_pair_create(
+							initiator, responder, checklist->is_initiator));
+		}
+		iterator_r->destroy(iterator_r);
+	}
+	iterator_i->destroy(iterator_i);
+
+	print_checklist(checklist);
+
+	prune_pairs(checklist->pairs);
+}
+
+/**
+ * Processes the payloads of a connectivity check and returns the extracted data
+ */
+static status_t process_payloads(message_t *message, check_t *check)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) != NOTIFY)
+		{
+			DBG1(DBG_IKE, "ignoring payload of type '%N' while processing "
+				 "connectivity check", payload_type_names,
+				 payload->get_type(payload));
+			continue;
+		}
+
+		notify_payload_t *notify = (notify_payload_t*)payload;
+
+		switch (notify->get_notify_type(notify))
+		{
+			case ME_ENDPOINT:
+			{
+				if (check->endpoint)
+				{
+					DBG1(DBG_IKE, "connectivity check contains multiple "
+						 "ME_ENDPOINT notifies");
+					break;
+				}
+
+				endpoint_notify_t *endpoint = endpoint_notify_create_from_payload(notify);
+				if (!endpoint)
+				{
+					DBG1(DBG_IKE, "received invalid ME_ENDPOINT notify");
+					break;
+				}
+				check->endpoint = endpoint;
+				check->endpoint_raw = chunk_clone(notify->get_notification_data(notify));
+				DBG2(DBG_IKE, "received ME_ENDPOINT notify");
+				break;
+			}
+			case ME_CONNECTID:
+			{
+				if (check->connect_id.ptr)
+				{
+					DBG1(DBG_IKE, "connectivity check contains multiple "
+						 "ME_CONNECTID notifies");
+					break;
+				}
+				check->connect_id = chunk_clone(notify->get_notification_data(notify));
+				DBG2(DBG_IKE, "received ME_CONNECTID %#B", &check->connect_id);
+				break;
+			}
+			case ME_CONNECTAUTH:
+			{
+				if (check->auth.ptr)
+				{
+					DBG1(DBG_IKE, "connectivity check contains multiple "
+						 "ME_CONNECTAUTH notifies");
+					break;
+				}
+				check->auth = chunk_clone(notify->get_notification_data(notify));
+				DBG2(DBG_IKE, "received ME_CONNECTAUTH %#B", &check->auth);
+				break;
+			}
+			default:
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	if (!check->connect_id.ptr || !check->endpoint || !check->auth.ptr)
+	{
+		DBG1(DBG_IKE, "at least one required payload was missing from the "
+			 "connectivity check");
+		return FAILED;
+	}
+
+	return SUCCESS;
+}
+
+/**
+ * Builds the signature for a connectivity check
+ */
+static chunk_t build_signature(private_connect_manager_t *this,
+		check_list_t *checklist, check_t *check, bool outbound)
+{
+	u_int32_t mid;
+	chunk_t mid_chunk, key_chunk, sig_chunk;
+	chunk_t sig_hash;
+
+	mid = htonl(check->mid);
+	mid_chunk = chunk_from_thing(mid);
+
+	key_chunk = (checklist->is_initiator && outbound) || (!checklist->is_initiator && !outbound)
+					? checklist->initiator.key : checklist->responder.key;
+
+	/* signature = SHA1( MID | ME_CONNECTID | ME_ENDPOINT | ME_CONNECTKEY ) */
+	sig_chunk = chunk_cat("cccc", mid_chunk, check->connect_id,
+						  check->endpoint_raw, key_chunk);
+	this->hasher->allocate_hash(this->hasher, sig_chunk, &sig_hash);
+	DBG3(DBG_IKE, "sig_chunk %#B", &sig_chunk);
+	DBG3(DBG_IKE, "sig_hash %#B", &sig_hash);
+
+	chunk_free(&sig_chunk);
+	return sig_hash;
+}
+
+static void queue_retransmission(private_connect_manager_t *this, check_list_t *checklist, endpoint_pair_t *pair);
+static void schedule_checks(private_connect_manager_t *this, check_list_t *checklist, u_int32_t time);
+static void finish_checks(private_connect_manager_t *this, check_list_t *checklist);
+
+/**
+ * After one of the initiator's pairs has succeeded we finish the checks without
+ * waiting for all the timeouts
+ */
+static job_requeue_t initiator_finish(callback_data_t *data)
+{
+	private_connect_manager_t *this = data->connect_manager;
+
+	this->mutex->lock(this->mutex);
+
+	check_list_t *checklist;
+	if (get_checklist_by_id(this, data->connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found, can't finish "
+			 "connectivity checks", &data->connect_id);
+		this->mutex->unlock(this->mutex);
+		return JOB_REQUEUE_NONE;
+	}
+
+	finish_checks(this, checklist);
+
+	this->mutex->unlock(this->mutex);
+
+	return JOB_REQUEUE_NONE;
+}
+
+/**
+ * Updates the state of the whole checklist
+ */
+static void update_checklist_state(private_connect_manager_t *this,
+								   check_list_t *checklist)
+{
+	iterator_t *iterator;
+	endpoint_pair_t *current;
+	bool in_progress = FALSE, succeeded = FALSE;
+
+	iterator = checklist->pairs->create_iterator(checklist->pairs, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		switch(current->state)
+		{
+			case CHECK_WAITING:
+				/* at least one is still waiting -> checklist remains
+				 * in waiting state */
+				iterator->destroy(iterator);
+				return;
+			case CHECK_IN_PROGRESS:
+				in_progress = TRUE;
+				break;
+			case CHECK_SUCCEEDED:
+				succeeded = TRUE;
+				break;
+			default:
+				break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	if (checklist->is_initiator && succeeded && !checklist->is_finishing)
+	{
+		/* instead of waiting until all checks have finished (i.e. all
+		 * retransmissions have failed) the initiator finishes the checks
+		 * right after the first check has succeeded. to allow a probably
+		 * better pair to succeed, we still wait a certain time */
+		DBG2(DBG_IKE, "fast finishing checks for checklist '%#B'",
+			 &checklist->connect_id);
+
+		callback_data_t *data = callback_data_create(this, checklist->connect_id);
+		job_t *job = (job_t*)callback_job_create((callback_job_cb_t)initiator_finish, data, (callback_job_cleanup_t)callback_data_destroy, NULL);
+		charon->scheduler->schedule_job_ms(charon->scheduler, job, ME_WAIT_TO_FINISH);
+		checklist->is_finishing = TRUE;
+	}
+
+	if (in_progress)
+	{
+		checklist->state = CHECK_IN_PROGRESS;
+	}
+	else if (succeeded)
+	{
+		checklist->state = CHECK_SUCCEEDED;
+	}
+	else
+	{
+		checklist->state = CHECK_FAILED;
+	}
+}
+
+/**
+ * This function is triggered for each sent check after a specific timeout
+ */
+static job_requeue_t retransmit(callback_data_t *data)
+{
+	private_connect_manager_t *this = data->connect_manager;
+
+	this->mutex->lock(this->mutex);
+
+	check_list_t *checklist;
+	if (get_checklist_by_id(this, data->connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found, can't retransmit "
+			 "connectivity check", &data->connect_id);
+		this->mutex->unlock(this->mutex);
+		return JOB_REQUEUE_NONE;
+	}
+
+	endpoint_pair_t *pair;
+	if (get_pair_by_id(checklist, data->mid, &pair) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "pair with id '%d' not found, can't retransmit "
+			 "connectivity check", data->mid);
+		goto retransmit_end;
+	}
+
+	if (pair->state != CHECK_IN_PROGRESS)
+	{
+		DBG2(DBG_IKE, "pair with id '%d' is in wrong state [%d], don't "
+			 "retransmit the connectivity check", data->mid, pair->state);
+		goto retransmit_end;
+	}
+
+	if (++pair->retransmitted > ME_MAX_RETRANS)
+	{
+		DBG2(DBG_IKE, "pair with id '%d' failed after %d retransmissions",
+			 data->mid, ME_MAX_RETRANS);
+		pair->state = CHECK_FAILED;
+		goto retransmit_end;
+	}
+
+	charon->sender->send(charon->sender, pair->packet->clone(pair->packet));
+
+	queue_retransmission(this, checklist, pair);
+
+retransmit_end:
+	update_checklist_state(this, checklist);
+
+	switch(checklist->state)
+	{
+		case CHECK_SUCCEEDED:
+		case CHECK_FAILED:
+			finish_checks(this, checklist);
+			break;
+		default:
+			break;
+	}
+
+	this->mutex->unlock(this->mutex);
+
+	/* we reschedule it manually */
+	return JOB_REQUEUE_NONE;
+}
+
+/**
+ * Queues a retransmission job
+ */
+static void queue_retransmission(private_connect_manager_t *this, check_list_t *checklist, endpoint_pair_t *pair)
+{
+	callback_data_t *data = retransmit_data_create(this, checklist->connect_id, pair->id);
+	job_t *job = (job_t*)callback_job_create((callback_job_cb_t)retransmit, data, (callback_job_cleanup_t)callback_data_destroy, NULL);
+
+	u_int32_t retransmission = pair->retransmitted + 1;
+	u_int32_t rto = ME_INTERVAL;
+	if (retransmission > ME_BOOST)
+	{
+		rto = (u_int32_t)(ME_INTERVAL * pow(ME_RETRANS_BASE, retransmission - ME_BOOST));
+	}
+	DBG2(DBG_IKE, "scheduling retransmission %d of pair '%d' in %dms",
+		 retransmission, pair->id, rto);
+
+	charon->scheduler->schedule_job_ms(charon->scheduler, (job_t*)job, rto);
+}
+
+/**
+ * Sends a check
+ */
+static void send_check(private_connect_manager_t *this, check_list_t *checklist,
+		check_t *check, endpoint_pair_t *pair, bool request)
+{
+	message_t *message = message_create();
+	message->set_message_id(message, check->mid);
+	message->set_exchange_type(message, INFORMATIONAL);
+	message->set_request(message, request);
+	message->set_destination(message, check->dst->clone(check->dst));
+	message->set_source(message, check->src->clone(check->src));
+
+	ike_sa_id_t *ike_sa_id = ike_sa_id_create(0, 0, request);
+	message->set_ike_sa_id(message, ike_sa_id);
+	ike_sa_id->destroy(ike_sa_id);
+
+	message->add_notify(message, FALSE, ME_CONNECTID, check->connect_id);
+	DBG2(DBG_IKE, "send ME_CONNECTID %#B", &check->connect_id);
+
+	notify_payload_t *endpoint = check->endpoint->build_notify(check->endpoint);
+	check->endpoint_raw = chunk_clone(endpoint->get_notification_data(endpoint));
+	message->add_payload(message, (payload_t*)endpoint);
+	DBG2(DBG_IKE, "send ME_ENDPOINT notify");
+
+	check->auth = build_signature(this, checklist, check, TRUE);
+	message->add_notify(message, FALSE, ME_CONNECTAUTH, check->auth);
+	DBG2(DBG_IKE, "send ME_CONNECTAUTH %#B", &check->auth);
+
+	packet_t *packet;
+	if (message->generate(message, NULL, NULL, &packet) == SUCCESS)
+	{
+		charon->sender->send(charon->sender, packet->clone(packet));
+
+		if (request)
+		{
+			DESTROY_IF(pair->packet);
+			pair->packet = packet;
+			pair->retransmitted = 0;
+			queue_retransmission(this, checklist, pair);
+		}
+		else
+		{
+			packet->destroy(packet);
+		}
+	}
+	message->destroy(message);
+}
+
+/**
+ * Queues a triggered check
+ */
+static void queue_triggered_check(private_connect_manager_t *this,
+		check_list_t *checklist, endpoint_pair_t *pair)
+{
+	DBG2(DBG_IKE, "queueing triggered check for pair '%d'", pair->id);
+	pair->state = CHECK_WAITING;
+	checklist->triggered->insert_last(checklist->triggered, pair);
+
+	if (!checklist->sender)
+	{
+		/* if the sender is not running we restart it */
+		schedule_checks(this, checklist, ME_INTERVAL);
+	}
+}
+
+/**
+ * This function is triggered for each checklist at a specific interval
+ */
+static job_requeue_t sender(callback_data_t *data)
+{
+	private_connect_manager_t *this = data->connect_manager;
+
+	this->mutex->lock(this->mutex);
+
+	check_list_t *checklist;
+	if (get_checklist_by_id(this, data->connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found, can't send "
+			 "connectivity check", &data->connect_id);
+		this->mutex->unlock(this->mutex);
+		return JOB_REQUEUE_NONE;
+	}
+
+	/* reset the sender */
+	checklist->sender = NULL;
+
+	endpoint_pair_t *pair;
+	if (get_triggered_pair(checklist, &pair) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "no triggered check queued, sending an ordinary check");
+
+		if (checklist->pairs->find_first(checklist->pairs,
+									(linked_list_match_t)match_waiting_pair,
+									(void**)&pair) != SUCCESS)
+		{
+			this->mutex->unlock(this->mutex);
+			DBG1(DBG_IKE, "no pairs in waiting state, aborting");
+			return JOB_REQUEUE_NONE;
+		}
+	}
+	else
+	{
+		DBG1(DBG_IKE, "triggered check found");
+	}
+
+	check_t *check = check_create();
+	check->mid = pair->id;
+	check->src = pair->local->clone(pair->local);
+	check->dst = pair->remote->clone(pair->remote);
+	check->connect_id = chunk_clone(checklist->connect_id);
+	check->endpoint = endpoint_notify_create_from_host(PEER_REFLEXIVE, NULL,
+													   NULL);
+
+	pair->state = CHECK_IN_PROGRESS;
+
+	send_check(this, checklist, check, pair, TRUE);
+
+	check_destroy(check);
+
+	/* schedule this job again */
+	schedule_checks(this, checklist, ME_INTERVAL);
+
+	this->mutex->unlock(this->mutex);
+
+	/* we reschedule it manually */
+	return JOB_REQUEUE_NONE;
+}
+
+/**
+ * Schedules checks for a checklist (time in ms)
+ */
+static void schedule_checks(private_connect_manager_t *this, check_list_t *checklist, u_int32_t time)
+{
+	callback_data_t *data = callback_data_create(this, checklist->connect_id);
+	checklist->sender = (job_t*)callback_job_create((callback_job_cb_t)sender, data, (callback_job_cleanup_t)callback_data_destroy, NULL);
+	charon->scheduler->schedule_job_ms(charon->scheduler, checklist->sender, time);
+}
+
+/**
+ * Initiates waiting mediated connections
+ */
+static job_requeue_t initiate_mediated(initiate_data_t *data)
+{
+	check_list_t *checklist = data->checklist;
+	initiated_t *initiated = data->initiated;
+
+	endpoint_pair_t *pair;
+	if (get_best_valid_pair(checklist, &pair) == SUCCESS)
+	{
+		ike_sa_id_t *waiting_sa;
+		iterator_t *iterator = initiated->mediated->create_iterator(initiated->mediated, TRUE);
+		while (iterator->iterate(iterator, (void**)&waiting_sa))
+		{
+			ike_sa_t *sa = charon->ike_sa_manager->checkout(charon->ike_sa_manager, waiting_sa);
+			if (sa->initiate_mediated(sa, pair->local, pair->remote, checklist->connect_id) != SUCCESS)
+			{
+				DBG1(DBG_IKE, "establishing mediated connection failed");
+				charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager, sa);
+			}
+			charon->ike_sa_manager->checkin(charon->ike_sa_manager, sa);
+		}
+		iterator->destroy(iterator);
+	}
+	else
+	{
+		/* this should (can?) not happen */
+	}
+
+	return JOB_REQUEUE_NONE;
+}
+
+/**
+ * Finishes checks for a checklist
+ */
+static void finish_checks(private_connect_manager_t *this, check_list_t *checklist)
+{
+	if (checklist->is_initiator)
+	{
+		initiated_t *initiated;
+		if (get_initiated_by_ids(this, checklist->initiator.id,
+				checklist->responder.id, &initiated) == SUCCESS)
+		{
+			remove_checklist(this, checklist);
+			remove_initiated(this, initiated);
+
+			initiate_data_t *data = initiate_data_create(checklist, initiated);
+			job_t *job = (job_t*)callback_job_create((callback_job_cb_t)initiate_mediated, data, (callback_job_cleanup_t)initiate_data_destroy, NULL);
+			charon->processor->queue_job(charon->processor, job);
+			return;
+		}
+		else
+		{
+			DBG1(DBG_IKE, "there is no mediated connection waiting between '%Y'"
+				 " and '%Y'", checklist->initiator.id, checklist->responder.id);
+		}
+	}
+}
+
+/**
+ * Process the response to one of our requests
+ */
+static void process_response(private_connect_manager_t *this, check_t *check,
+		check_list_t *checklist)
+{
+	endpoint_pair_t *pair;
+	if (get_pair_by_id(checklist, check->mid, &pair) == SUCCESS)
+	{
+		if (pair->local->equals(pair->local, check->dst) &&
+			pair->remote->equals(pair->remote, check->src))
+		{
+			DBG1(DBG_IKE, "endpoint pair '%d' is valid: '%#H' - '%#H'",
+				 pair->id, pair->local, pair->remote);
+			pair->state = CHECK_SUCCEEDED;
+		}
+
+		linked_list_t *local_endpoints = checklist->is_initiator ?
+			checklist->initiator.endpoints : checklist->responder.endpoints;
+
+		endpoint_notify_t *local_endpoint;
+		if (endpoints_contain(local_endpoints,
+							  check->endpoint->get_host(check->endpoint),
+							  &local_endpoint) != SUCCESS)
+		{
+			local_endpoint = endpoint_notify_create_from_host(PEER_REFLEXIVE,
+					check->endpoint->get_host(check->endpoint), pair->local);
+			local_endpoint->set_priority(local_endpoint,
+								check->endpoint->get_priority(check->endpoint));
+			local_endpoints->insert_last(local_endpoints, local_endpoint);
+		}
+
+		update_checklist_state(this, checklist);
+
+		switch(checklist->state)
+		{
+			case CHECK_SUCCEEDED:
+			case CHECK_FAILED:
+				finish_checks(this, checklist);
+				break;
+			default:
+				break;
+		}
+	}
+	else
+	{
+		DBG1(DBG_IKE, "pair with id '%d' not found", check->mid);
+	}
+}
+
+static void process_request(private_connect_manager_t *this, check_t *check,
+							check_list_t *checklist)
+{
+	linked_list_t *remote_endpoints = checklist->is_initiator ?
+				checklist->responder.endpoints : checklist->initiator.endpoints;
+
+	endpoint_notify_t *peer_reflexive, *remote_endpoint;
+	peer_reflexive = endpoint_notify_create_from_host(PEER_REFLEXIVE,
+													  check->src, NULL);
+	peer_reflexive->set_priority(peer_reflexive,
+							check->endpoint->get_priority(check->endpoint));
+
+	if (endpoints_contain(remote_endpoints, check->src, &remote_endpoint) != SUCCESS)
+	{
+		remote_endpoint = peer_reflexive->clone(peer_reflexive);
+		remote_endpoints->insert_last(remote_endpoints, remote_endpoint);
+	}
+
+	endpoint_pair_t *pair;
+	if (get_pair_by_hosts(checklist->pairs, check->dst, check->src,
+						  &pair) == SUCCESS)
+	{
+		switch(pair->state)
+		{
+			case CHECK_IN_PROGRESS:
+				/* prevent retransmissions */
+				pair->retransmitted = ME_MAX_RETRANS;
+				/* FIXME: we should wait to the next rto to send the triggered
+				 * check */
+				/* fall-through */
+			case CHECK_WAITING:
+			case CHECK_FAILED:
+				queue_triggered_check(this, checklist, pair);
+				break;
+			case CHECK_SUCCEEDED:
+			default:
+				break;
+		}
+	}
+	else
+	{
+		endpoint_notify_t *local_endpoint = endpoint_notify_create_from_host(HOST, check->dst, NULL);
+
+		endpoint_notify_t *initiator = checklist->is_initiator ? local_endpoint : remote_endpoint;
+		endpoint_notify_t *responder = checklist->is_initiator ? remote_endpoint : local_endpoint;
+
+		pair = endpoint_pair_create(initiator, responder, checklist->is_initiator);
+		pair->id = checklist->pairs->get_count(checklist->pairs) + 1;
+
+		insert_pair_by_priority(checklist->pairs, pair);
+
+		queue_triggered_check(this, checklist, pair);
+
+		local_endpoint->destroy(local_endpoint);
+	}
+
+	check_t *response = check_create();
+
+	response->mid = check->mid;
+	response->src = check->dst->clone(check->dst);
+	response->dst = check->src->clone(check->src);
+	response->connect_id = chunk_clone(check->connect_id);
+	response->endpoint = peer_reflexive;
+
+	send_check(this, checklist, response, pair, FALSE);
+
+	check_destroy(response);
+}
+
+/**
+ * Implementation of connect_manager_t.process_check.
+ */
+static void process_check(private_connect_manager_t *this, message_t *message)
+{
+	if (message->parse_body(message, NULL, NULL) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "%N %s with message ID %d processing failed",
+			 exchange_type_names, message->get_exchange_type(message),
+			 message->get_request(message) ? "request" : "response",
+			 message->get_message_id(message));
+		return;
+	}
+
+	check_t *check = check_create();
+	check->mid = message->get_message_id(message);
+	check->src = message->get_source(message);
+	check->src = check->src->clone(check->src);
+	check->dst = message->get_destination(message);
+	check->dst = check->dst->clone(check->dst);
+
+	if (process_payloads(message, check) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "invalid connectivity check %s received",
+			 message->get_request(message) ? "request" : "response");
+		check_destroy(check);
+		return;
+	}
+
+	this->mutex->lock(this->mutex);
+
+	check_list_t *checklist;
+	if (get_checklist_by_id(this, check->connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found",
+			 &check->connect_id);
+		check_destroy(check);
+		this->mutex->unlock(this->mutex);
+		return;
+	}
+
+	chunk_t sig = build_signature(this, checklist, check, FALSE);
+	if (!chunk_equals(sig, check->auth))
+	{
+		DBG1(DBG_IKE, "connectivity check verification failed");
+		check_destroy(check);
+		chunk_free(&sig);
+		this->mutex->unlock(this->mutex);
+		return;
+	}
+	chunk_free(&sig);
+
+	if (message->get_request(message))
+	{
+		process_request(this, check, checklist);
+	}
+	else
+	{
+		process_response(this, check, checklist);
+	}
+
+	this->mutex->unlock(this->mutex);
+
+	check_destroy(check);
+}
+
+/**
+ * Implementation of connect_manager_t.check_and_register.
+ */
+static bool check_and_register(private_connect_manager_t *this,
+			identification_t *id, identification_t *peer_id,
+			ike_sa_id_t *mediated_sa)
+{
+	initiated_t *initiated;
+	bool already_there = TRUE;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_initiated_by_ids(this, id, peer_id, &initiated) != SUCCESS)
+	{
+		DBG2(DBG_IKE, "registered waiting mediated connection with '%Y'",
+			 peer_id);
+		initiated = initiated_create(id, peer_id);
+		this->initiated->insert_last(this->initiated, initiated);
+		already_there = FALSE;
+	}
+
+	if (initiated->mediated->find_first(initiated->mediated,
+								(linked_list_match_t)mediated_sa->equals,
+								NULL, mediated_sa) != SUCCESS)
+	{
+		initiated->mediated->insert_last(initiated->mediated,
+										 mediated_sa->clone(mediated_sa));
+	}
+
+	this->mutex->unlock(this->mutex);
+
+	return already_there;
+}
+
+/**
+ * Implementation of connect_manager_t.check_and_initiate.
+ */
+static void check_and_initiate(private_connect_manager_t *this,
+							   ike_sa_id_t *mediation_sa, identification_t *id,
+							   identification_t *peer_id)
+{
+	initiated_t *initiated;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_initiated_by_ids(this, id, peer_id, &initiated) != SUCCESS)
+	{
+		DBG2(DBG_IKE, "no waiting mediated connections with '%Y'", peer_id);
+		this->mutex->unlock(this->mutex);
+		return;
+	}
+
+	ike_sa_id_t *waiting_sa;
+	iterator_t *iterator = initiated->mediated->create_iterator(
+													initiated->mediated, TRUE);
+	while (iterator->iterate(iterator, (void**)&waiting_sa))
+	{
+		job_t *job = (job_t*)reinitiate_mediation_job_create(mediation_sa,
+															 waiting_sa);
+		charon->processor->queue_job(charon->processor, job);
+	}
+	iterator->destroy(iterator);
+
+	this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of connect_manager_t.set_initiator_data.
+ */
+static status_t set_initiator_data(private_connect_manager_t *this,
+								   identification_t *initiator,
+								   identification_t *responder,
+								   chunk_t connect_id, chunk_t key,
+								   linked_list_t *endpoints, bool is_initiator)
+{
+	check_list_t *checklist;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_checklist_by_id(this, connect_id, NULL) == SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' already exists, aborting",
+			 &connect_id);
+		this->mutex->unlock(this->mutex);
+		return FAILED;
+	}
+
+	checklist = check_list_create(initiator, responder, connect_id, key,
+								  endpoints, is_initiator);
+	this->checklists->insert_last(this->checklists, checklist);
+
+	this->mutex->unlock(this->mutex);
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of connect_manager_t.set_responder_data.
+ */
+static status_t set_responder_data(private_connect_manager_t *this,
+								   chunk_t connect_id, chunk_t key,
+								   linked_list_t *endpoints)
+{
+	check_list_t *checklist;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_checklist_by_id(this, connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found",
+			 &connect_id);
+		this->mutex->unlock(this->mutex);
+		return NOT_FOUND;
+	}
+
+	checklist->responder.key = chunk_clone(key);
+	checklist->responder.endpoints = endpoints->clone_offset(endpoints,
+											offsetof(endpoint_notify_t, clone));
+	checklist->state = CHECK_WAITING;
+
+	build_pairs(checklist);
+
+	/* send the first check immediately */
+	schedule_checks(this, checklist, 0);
+
+	this->mutex->unlock(this->mutex);
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of connect_manager_t.stop_checks.
+ */
+static status_t stop_checks(private_connect_manager_t *this, chunk_t connect_id)
+{
+	check_list_t *checklist;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_checklist_by_id(this, connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found",
+			 &connect_id);
+		this->mutex->unlock(this->mutex);
+		return NOT_FOUND;
+	}
+
+	DBG1(DBG_IKE, "removing checklist with id '%#B'", &connect_id);
+
+	remove_checklist(this, checklist);
+	check_list_destroy(checklist);
+
+	this->mutex->unlock(this->mutex);
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of connect_manager_t.destroy.
+ */
+static void destroy(private_connect_manager_t *this)
+{
+	this->mutex->lock(this->mutex);
+
+	this->hasher->destroy(this->hasher);
+	this->checklists->destroy_function(this->checklists, (void*)check_list_destroy);
+	this->initiated->destroy_function(this->initiated, (void*)initiated_destroy);
+
+	this->mutex->unlock(this->mutex);
+	this->mutex->destroy(this->mutex);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+connect_manager_t *connect_manager_create()
+{
+	private_connect_manager_t *this = malloc_thing(private_connect_manager_t);
+
+	this->public.destroy = (void(*)(connect_manager_t*))destroy;
+	this->public.check_and_register = (bool(*)(connect_manager_t*,identification_t*,identification_t*,ike_sa_id_t*))check_and_register;
+	this->public.check_and_initiate = (void(*)(connect_manager_t*,ike_sa_id_t*,identification_t*,identification_t*))check_and_initiate;
+	this->public.set_initiator_data = (status_t(*)(connect_manager_t*,identification_t*,identification_t*,chunk_t,chunk_t,linked_list_t*,bool))set_initiator_data;
+	this->public.set_responder_data = (status_t(*)(connect_manager_t*,chunk_t,chunk_t,linked_list_t*))set_responder_data;
+	this->public.process_check = (void(*)(connect_manager_t*,message_t*))process_check;
+	this->public.stop_checks = (status_t(*)(connect_manager_t*,chunk_t))stop_checks;
+
+	this->hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
+	if (this->hasher == NULL)
+	{
+		DBG1(DBG_IKE, "unable to create connect manager, SHA1 not supported");
+		free(this);
+		return NULL;
+	}
+
+	this->checklists = linked_list_create();
+	this->initiated = linked_list_create();
+
+	this->mutex = mutex_create(MUTEX_TYPE_DEFAULT);
+
+	return (connect_manager_t*)this;
+}