1 files changed, 403 insertions, 0 deletions
diff --git a/src/libcharon/sa/trap_manager.c b/src/libcharon/sa/trap_manager.c
new file mode 100644
index 000000000..878170c83
--- /dev/null
+++ b/src/libcharon/sa/trap_manager.c
@@ -0,0 +1,403 @@
+/*
+ * 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 "trap_manager.h"
+
+#include <daemon.h>
+#include <threading/rwlock.h>
+#include <utils/linked_list.h>
+
+
+typedef struct private_trap_manager_t private_trap_manager_t;
+typedef struct trap_listener_t trap_listener_t;
+
+/**
+ * listener to track acquires
+ */
+struct trap_listener_t {
+
+	/**
+	 * Implements listener interface
+	 */
+	listener_t listener;
+
+	/**
+	 * points to trap_manager
+	 */
+	private_trap_manager_t *traps;
+};
+
+/**
+ * Private data of an trap_manager_t object.
+ */
+struct private_trap_manager_t {
+
+	/**
+	 * Public trap_manager_t interface.
+	 */
+	trap_manager_t public;
+
+	/**
+	 * Installed traps, as entry_t
+	 */
+	linked_list_t *traps;
+
+	/**
+	 * read write lock for traps list
+	 */
+	rwlock_t *lock;
+
+	/**
+	 * listener to track acquiring IKE_SAs
+	 */
+	trap_listener_t listener;
+};
+
+/**
+ * A installed trap entry
+ */
+typedef struct {
+	/** ref to peer_cfg to initiate */
+	peer_cfg_t *peer_cfg;
+	/** ref to instanciated CHILD_SA */
+	child_sa_t *child_sa;
+	/** pending IKE_SA connecting upon acquire */
+	ike_sa_t *pending;
+} entry_t;
+
+/**
+ * actually uninstall and destroy an installed entry
+ */
+static void destroy_entry(entry_t *entry)
+{
+	entry->child_sa->destroy(entry->child_sa);
+	entry->peer_cfg->destroy(entry->peer_cfg);
+	free(entry);
+}
+
+/**
+ * Implementation of trap_manager_t.install
+ */
+static u_int32_t install(private_trap_manager_t *this, peer_cfg_t *peer,
+					 child_cfg_t *child)
+{
+	entry_t *entry;
+	ike_cfg_t *ike_cfg;
+	child_sa_t *child_sa;
+	host_t *me, *other;
+	linked_list_t *my_ts, *other_ts;
+	enumerator_t *enumerator;
+	bool found = FALSE;
+	status_t status;
+	u_int32_t reqid;
+
+	/* check if not already done */
+	this->lock->read_lock(this->lock);
+	enumerator = this->traps->create_enumerator(this->traps);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (streq(entry->child_sa->get_name(entry->child_sa),
+				  child->get_name(child)))
+		{
+			found = TRUE;
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+	if (found)
+	{
+		DBG1(DBG_CFG, "CHILD_SA named '%s' already routed",
+			 child->get_name(child));
+		return 0;
+	}
+
+	/* try to resolve addresses */
+	ike_cfg = peer->get_ike_cfg(peer);
+	other = host_create_from_dns(ike_cfg->get_other_addr(ike_cfg),
+								 0, ike_cfg->get_other_port(ike_cfg));
+	if (!other)
+	{
+		DBG1(DBG_CFG, "installing trap failed, remote address unknown");
+		return 0;
+	}
+	me = host_create_from_dns(ike_cfg->get_my_addr(ike_cfg),
+					other->get_family(other), ike_cfg->get_my_port(ike_cfg));
+	if (!me || me->is_anyaddr(me))
+	{
+		DESTROY_IF(me);
+		me = charon->kernel_interface->get_source_addr(
+									charon->kernel_interface, other, NULL);
+		if (!me)
+		{
+			DBG1(DBG_CFG, "installing trap failed, local address unknown");
+			other->destroy(other);
+			return 0;
+		}
+		me->set_port(me, ike_cfg->get_my_port(ike_cfg));
+	}
+
+	/* create and route CHILD_SA */
+	child_sa = child_sa_create(me, other, child, 0, FALSE);
+	my_ts = child->get_traffic_selectors(child, TRUE, NULL, me);
+	other_ts = child->get_traffic_selectors(child, FALSE, NULL, other);
+	me->destroy(me);
+	other->destroy(other);
+
+	/* while we don't know the finally negotiated protocol (ESP|AH), we
+	 * could iterate all proposals for a best guest (TODO). But as we
+	 * support ESP only for now, we set here. */
+	child_sa->set_protocol(child_sa, PROTO_ESP);
+	child_sa->set_mode(child_sa, child->get_mode(child));
+	status = child_sa->add_policies(child_sa, my_ts, other_ts);
+	my_ts->destroy_offset(my_ts, offsetof(traffic_selector_t, destroy));
+	other_ts->destroy_offset(other_ts, offsetof(traffic_selector_t, destroy));
+	if (status != SUCCESS)
+	{
+		child_sa->destroy(child_sa);
+		DBG1(DBG_CFG, "installing trap failed");
+		return 0;
+	}
+
+	reqid = child_sa->get_reqid(child_sa);
+	entry = malloc_thing(entry_t);
+	entry->child_sa = child_sa;
+	entry->peer_cfg = peer->get_ref(peer);
+	entry->pending = NULL;
+
+	this->lock->write_lock(this->lock);
+	this->traps->insert_last(this->traps, entry);
+	this->lock->unlock(this->lock);
+
+	return reqid;
+}
+
+/**
+ * Implementation of trap_manager_t.uninstall
+ */
+static bool uninstall(private_trap_manager_t *this, u_int32_t reqid)
+{
+	enumerator_t *enumerator;
+	entry_t *entry, *found = NULL;
+
+	this->lock->write_lock(this->lock);
+	enumerator = this->traps->create_enumerator(this->traps);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->child_sa->get_reqid(entry->child_sa) == reqid)
+		{
+			this->traps->remove_at(this->traps, enumerator);
+			found = entry;
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+
+	if (!found)
+	{
+		DBG1(DBG_CFG, "trap %d not found to uninstall", reqid);
+		return FALSE;
+	}
+
+	destroy_entry(found);
+	return TRUE;
+}
+
+/**
+ * convert enumerated entries to peer_cfg, child_sa
+ */
+static bool trap_filter(rwlock_t *lock, entry_t **entry, peer_cfg_t **peer_cfg,
+						void *none, child_sa_t **child_sa)
+{
+	if (peer_cfg)
+	{
+		*peer_cfg = (*entry)->peer_cfg;
+	}
+	if (child_sa)
+	{
+		*child_sa = (*entry)->child_sa;
+	}
+	return TRUE;
+}
+
+/**
+ * Implementation of trap_manager_t.create_enumerator
+ */
+static enumerator_t* create_enumerator(private_trap_manager_t *this)
+{
+	this->lock->read_lock(this->lock);
+	return enumerator_create_filter(this->traps->create_enumerator(this->traps),
+									(void*)trap_filter, this->lock,
+									(void*)this->lock->unlock);
+}
+
+/**
+ * Implementation of trap_manager_t.acquire
+ */
+static void acquire(private_trap_manager_t *this, u_int32_t reqid,
+					traffic_selector_t *src, traffic_selector_t *dst)
+{
+	enumerator_t *enumerator;
+	entry_t *entry, *found = NULL;
+	peer_cfg_t *peer;
+	child_cfg_t *child;
+	ike_sa_t *ike_sa;
+
+	this->lock->read_lock(this->lock);
+	enumerator = this->traps->create_enumerator(this->traps);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->child_sa->get_reqid(entry->child_sa) == reqid)
+		{
+			found = entry;
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	if (!found)
+	{
+		DBG1(DBG_CFG, "trap not found, unable to acquire reqid %d",reqid);
+	}
+	else if (found->pending)
+	{
+		DBG1(DBG_CFG, "ignoring acquire, connection attempt pending");
+	}
+	else
+	{
+		child = found->child_sa->get_config(found->child_sa);
+		peer = found->peer_cfg;
+		ike_sa = charon->ike_sa_manager->checkout_by_config(
+												charon->ike_sa_manager, peer);
+		if (ike_sa->get_peer_cfg(ike_sa) == NULL)
+		{
+			ike_sa->set_peer_cfg(ike_sa, peer);
+		}
+		child->get_ref(child);
+		reqid = found->child_sa->get_reqid(found->child_sa);
+		if (ike_sa->initiate(ike_sa, child, reqid, src, dst) != DESTROY_ME)
+		{
+			found->pending = ike_sa;
+			charon->ike_sa_manager->checkin(charon->ike_sa_manager, ike_sa);
+		}
+		else
+		{
+			charon->ike_sa_manager->checkin_and_destroy(
+												charon->ike_sa_manager, ike_sa);
+		}
+	}
+	this->lock->unlock(this->lock);
+}
+
+/**
+ * Complete the acquire, if successful or failed
+ */
+static void complete(private_trap_manager_t *this, ike_sa_t *ike_sa,
+					 child_sa_t *child_sa)
+{
+	enumerator_t *enumerator;
+	entry_t *entry;
+
+	this->lock->read_lock(this->lock);
+	enumerator = this->traps->create_enumerator(this->traps);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->pending != ike_sa)
+		{
+			continue;
+		}
+		if (child_sa && child_sa->get_reqid(child_sa) !=
+									entry->child_sa->get_reqid(entry->child_sa))
+		{
+			continue;
+		}
+		entry->pending = NULL;
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+}
+
+/**
+ * Implementation of listener_t.ike_state_change
+ */
+static bool ike_state_change(trap_listener_t *listener, ike_sa_t *ike_sa,
+							 ike_sa_state_t state)
+{
+	switch (state)
+	{
+		case IKE_DESTROYING:
+			complete(listener->traps, ike_sa, NULL);
+			return TRUE;
+		default:
+			return TRUE;
+	}
+}
+
+/**
+ * Implementation of listener_t.child_state_change
+ */
+static bool child_state_change(trap_listener_t *listener, ike_sa_t *ike_sa,
+							   child_sa_t *child_sa, child_sa_state_t state)
+{
+	switch (state)
+	{
+		case CHILD_INSTALLED:
+		case CHILD_DESTROYING:
+			complete(listener->traps, ike_sa, child_sa);
+			return TRUE;
+		default:
+			return TRUE;
+	}
+}
+
+/**
+ * Implementation of trap_manager_t.destroy.
+ */
+static void destroy(private_trap_manager_t *this)
+{
+	charon->bus->remove_listener(charon->bus, &this->listener.listener);
+	this->traps->invoke_function(this->traps, (void*)destroy_entry);
+	this->traps->destroy(this->traps);
+	this->lock->destroy(this->lock);
+	free(this);
+}
+
+/**
+ * See header
+ */
+trap_manager_t *trap_manager_create()
+{
+	private_trap_manager_t *this = malloc_thing(private_trap_manager_t);
+
+	this->public.install = (u_int(*)(trap_manager_t*, peer_cfg_t *peer, child_cfg_t *child))install;
+	this->public.uninstall = (bool(*)(trap_manager_t*, u_int32_t id))uninstall;
+	this->public.create_enumerator = (enumerator_t*(*)(trap_manager_t*))create_enumerator;
+	this->public.acquire = (void(*)(trap_manager_t*, u_int32_t reqid, traffic_selector_t *src, traffic_selector_t *dst))acquire;
+	this->public.destroy = (void(*)(trap_manager_t*))destroy;
+
+	this->traps = linked_list_create();
+	this->lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
+
+	/* register listener for IKE state changes */
+	this->listener.traps = this;
+	memset(&this->listener.listener, 0, sizeof(listener_t));
+	this->listener.listener.ike_state_change = (void*)ike_state_change;
+	this->listener.listener.child_state_change = (void*)child_state_change;
+	charon->bus->add_listener(charon->bus, &this->listener.listener);
+
+	return &this->public;
+}
+