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-rw-r--r--src/libcharon/bus/bus.c727
-rw-r--r--src/libcharon/bus/bus.h286
-rw-r--r--src/libcharon/bus/listeners/file_logger.c125
-rw-r--r--src/libcharon/bus/listeners/file_logger.h60
-rw-r--r--src/libcharon/bus/listeners/listener.h178
-rw-r--r--src/libcharon/bus/listeners/sys_logger.c121
-rw-r--r--src/libcharon/bus/listeners/sys_logger.h62
7 files changed, 1559 insertions, 0 deletions
diff --git a/src/libcharon/bus/bus.c b/src/libcharon/bus/bus.c
new file mode 100644
index 000000000..764744a41
--- /dev/null
+++ b/src/libcharon/bus/bus.c
@@ -0,0 +1,727 @@
+/*
+ * Copyright (C) 2006 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 "bus.h"
+
+#include <stdint.h>
+
+#include <daemon.h>
+#include <threading/thread.h>
+#include <threading/thread_value.h>
+#include <threading/condvar.h>
+#include <threading/mutex.h>
+
+typedef struct private_bus_t private_bus_t;
+
+/**
+ * Private data of a bus_t object.
+ */
+struct private_bus_t {
+ /**
+ * Public part of a bus_t object.
+ */
+ bus_t public;
+
+ /**
+ * List of registered listeners as entry_t's
+ */
+ linked_list_t *listeners;
+
+ /**
+ * mutex to synchronize active listeners, recursively
+ */
+ mutex_t *mutex;
+
+ /**
+ * Thread local storage the threads IKE_SA
+ */
+ thread_value_t *thread_sa;
+};
+
+typedef struct entry_t entry_t;
+
+/**
+ * a listener entry, either active or passive
+ */
+struct entry_t {
+
+ /**
+ * registered listener interface
+ */
+ listener_t *listener;
+
+ /**
+ * is this a active listen() call with a blocking thread
+ */
+ bool blocker;
+
+ /**
+ * are we currently calling this listener
+ */
+ int calling;
+
+ /**
+ * condvar where active listeners wait
+ */
+ condvar_t *condvar;
+};
+
+/**
+ * create a listener entry
+ */
+static entry_t *entry_create(listener_t *listener, bool blocker)
+{
+ entry_t *this = malloc_thing(entry_t);
+
+ this->listener = listener;
+ this->blocker = blocker;
+ this->calling = 0;
+ this->condvar = condvar_create(CONDVAR_TYPE_DEFAULT);
+
+ return this;
+}
+
+/**
+ * destroy an entry_t
+ */
+static void entry_destroy(entry_t *entry)
+{
+ entry->condvar->destroy(entry->condvar);
+ free(entry);
+}
+
+/**
+ * Implementation of bus_t.add_listener.
+ */
+static void add_listener(private_bus_t *this, listener_t *listener)
+{
+ this->mutex->lock(this->mutex);
+ this->listeners->insert_last(this->listeners, entry_create(listener, FALSE));
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.remove_listener.
+ */
+static void remove_listener(private_bus_t *this, listener_t *listener)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->listener == listener)
+ {
+ this->listeners->remove_at(this->listeners, enumerator);
+ entry_destroy(entry);
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+typedef struct cleanup_data_t cleanup_data_t;
+
+/**
+ * data to remove a listener using thread_cleanup_t handler
+ */
+struct cleanup_data_t {
+ /** bus instance */
+ private_bus_t *this;
+ /** listener entry */
+ entry_t *entry;
+};
+
+/**
+ * thread_cleanup_t handler to remove a listener
+ */
+static void listener_cleanup(cleanup_data_t *data)
+{
+ data->this->listeners->remove(data->this->listeners, data->entry, NULL);
+ entry_destroy(data->entry);
+}
+
+/**
+ * Implementation of bus_t.listen.
+ */
+static void listen_(private_bus_t *this, listener_t *listener, job_t *job)
+{
+ bool old;
+ cleanup_data_t data;
+
+ data.this = this;
+ data.entry = entry_create(listener, TRUE);
+
+ this->mutex->lock(this->mutex);
+ this->listeners->insert_last(this->listeners, data.entry);
+ charon->processor->queue_job(charon->processor, job);
+ thread_cleanup_push((thread_cleanup_t)this->mutex->unlock, this->mutex);
+ thread_cleanup_push((thread_cleanup_t)listener_cleanup, &data);
+ old = thread_cancelability(TRUE);
+ while (data.entry->blocker)
+ {
+ data.entry->condvar->wait(data.entry->condvar, this->mutex);
+ }
+ thread_cancelability(old);
+ thread_cleanup_pop(FALSE);
+ /* unlock mutex */
+ thread_cleanup_pop(TRUE);
+ entry_destroy(data.entry);
+}
+
+/**
+ * Implementation of bus_t.set_sa.
+ */
+static void set_sa(private_bus_t *this, ike_sa_t *ike_sa)
+{
+ this->thread_sa->set(this->thread_sa, ike_sa);
+}
+
+/**
+ * Implementation of bus_t.get_sa
+ */
+static ike_sa_t* get_sa(private_bus_t *this)
+{
+ return this->thread_sa->get(this->thread_sa);
+}
+
+/**
+ * data associated to a signal, passed to callback
+ */
+typedef struct {
+ /** associated IKE_SA */
+ ike_sa_t *ike_sa;
+ /** invoking thread */
+ long thread;
+ /** debug group */
+ debug_t group;
+ /** debug level */
+ level_t level;
+ /** format string */
+ char *format;
+ /** argument list */
+ va_list args;
+} log_data_t;
+
+/**
+ * listener->log() invocation as a list remove callback
+ */
+static bool log_cb(entry_t *entry, log_data_t *data)
+{
+ va_list args;
+
+ if (entry->calling || !entry->listener->log)
+ { /* avoid recursive calls */
+ return FALSE;
+ }
+ entry->calling++;
+ va_copy(args, data->args);
+ if (!entry->listener->log(entry->listener, data->group, data->level,
+ data->thread, data->ike_sa, data->format, args))
+ {
+ if (entry->blocker)
+ {
+ entry->blocker = FALSE;
+ entry->condvar->signal(entry->condvar);
+ }
+ else
+ {
+ entry_destroy(entry);
+ }
+ va_end(args);
+ entry->calling--;
+ return TRUE;
+ }
+ va_end(args);
+ entry->calling--;
+ return FALSE;
+}
+
+/**
+ * Implementation of bus_t.vlog.
+ */
+static void vlog(private_bus_t *this, debug_t group, level_t level,
+ char* format, va_list args)
+{
+ log_data_t data;
+
+ data.ike_sa = this->thread_sa->get(this->thread_sa);
+ data.thread = thread_current_id();
+ data.group = group;
+ data.level = level;
+ data.format = format;
+ va_copy(data.args, args);
+
+ this->mutex->lock(this->mutex);
+ /* We use the remove() method to invoke all listeners. This is cheap and
+ * does not require an allocation for this performance critical function. */
+ this->listeners->remove(this->listeners, &data, (void*)log_cb);
+ this->mutex->unlock(this->mutex);
+
+ va_end(data.args);
+}
+
+/**
+ * Implementation of bus_t.log.
+ */
+static void log_(private_bus_t *this, debug_t group, level_t level,
+ char* format, ...)
+{
+ va_list args;
+
+ va_start(args, format);
+ vlog(this, group, level, format, args);
+ va_end(args);
+}
+
+/**
+ * unregister a listener
+ */
+static void unregister_listener(private_bus_t *this, entry_t *entry,
+ enumerator_t *enumerator)
+{
+ if (entry->blocker)
+ {
+ entry->blocker = FALSE;
+ entry->condvar->signal(entry->condvar);
+ }
+ else
+ {
+ entry_destroy(entry);
+ }
+ this->listeners->remove_at(this->listeners, enumerator);
+}
+
+/**
+ * Implementation of bus_t.alert
+ */
+static void alert(private_bus_t *this, alert_t alert, ...)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ va_list args;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->alert)
+ {
+ continue;
+ }
+ entry->calling++;
+ va_start(args, alert);
+ keep = entry->listener->alert(entry->listener, ike_sa, alert, args);
+ va_end(args);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.ike_state_change
+ */
+static void ike_state_change(private_bus_t *this, ike_sa_t *ike_sa,
+ ike_sa_state_t state)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+ bool keep;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->ike_state_change)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->ike_state_change(entry->listener, ike_sa, state);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.child_state_change
+ */
+static void child_state_change(private_bus_t *this, child_sa_t *child_sa,
+ child_sa_state_t state)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->child_state_change)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->child_state_change(entry->listener, ike_sa,
+ child_sa, state);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.message
+ */
+static void message(private_bus_t *this, message_t *message, bool incoming)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->message)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->message(entry->listener, ike_sa,
+ message, incoming);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.ike_keys
+ */
+static void ike_keys(private_bus_t *this, ike_sa_t *ike_sa,
+ diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r,
+ ike_sa_t *rekey)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+ bool keep;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->ike_keys)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->ike_keys(entry->listener, ike_sa, dh,
+ nonce_i, nonce_r, rekey);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.child_keys
+ */
+static void child_keys(private_bus_t *this, child_sa_t *child_sa,
+ diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->child_keys)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->child_keys(entry->listener, ike_sa, child_sa,
+ dh, nonce_i, nonce_r);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.child_updown
+ */
+static void child_updown(private_bus_t *this, child_sa_t *child_sa, bool up)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->child_updown)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->child_updown(entry->listener,
+ ike_sa, child_sa, up);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.child_rekey
+ */
+static void child_rekey(private_bus_t *this, child_sa_t *old, child_sa_t *new)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->child_rekey)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->child_rekey(entry->listener, ike_sa, old, new);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.ike_updown
+ */
+static void ike_updown(private_bus_t *this, ike_sa_t *ike_sa, bool up)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+ bool keep;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->ike_updown)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->ike_updown(entry->listener, ike_sa, up);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+
+ /* a down event for IKE_SA implicitly downs all CHILD_SAs */
+ if (!up)
+ {
+ iterator_t *iterator;
+ child_sa_t *child_sa;
+
+ iterator = ike_sa->create_child_sa_iterator(ike_sa);
+ while (iterator->iterate(iterator, (void**)&child_sa))
+ {
+ child_updown(this, child_sa, FALSE);
+ }
+ iterator->destroy(iterator);
+ }
+}
+
+/**
+ * Implementation of bus_t.ike_rekey
+ */
+static void ike_rekey(private_bus_t *this, ike_sa_t *old, ike_sa_t *new)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+ bool keep;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->ike_rekey)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->ike_rekey(entry->listener, old, new);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.authorize
+ */
+static bool authorize(private_bus_t *this, bool final)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep, success = TRUE;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->authorize)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->authorize(entry->listener, ike_sa,
+ final, &success);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ if (!success)
+ {
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+ return success;
+}
+
+/**
+ * Implementation of bus_t.destroy.
+ */
+static void destroy(private_bus_t *this)
+{
+ this->thread_sa->destroy(this->thread_sa);
+ this->mutex->destroy(this->mutex);
+ this->listeners->destroy_function(this->listeners, (void*)entry_destroy);
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+bus_t *bus_create()
+{
+ private_bus_t *this = malloc_thing(private_bus_t);
+
+ this->public.add_listener = (void(*)(bus_t*,listener_t*))add_listener;
+ this->public.remove_listener = (void(*)(bus_t*,listener_t*))remove_listener;
+ this->public.listen = (void(*)(bus_t*, listener_t *listener, job_t *job))listen_;
+ this->public.set_sa = (void(*)(bus_t*,ike_sa_t*))set_sa;
+ this->public.get_sa = (ike_sa_t*(*)(bus_t*))get_sa;
+ this->public.log = (void(*)(bus_t*,debug_t,level_t,char*,...))log_;
+ this->public.vlog = (void(*)(bus_t*,debug_t,level_t,char*,va_list))vlog;
+ this->public.alert = (void(*)(bus_t*, alert_t alert, ...))alert;
+ this->public.ike_state_change = (void(*)(bus_t*,ike_sa_t*,ike_sa_state_t))ike_state_change;
+ this->public.child_state_change = (void(*)(bus_t*,child_sa_t*,child_sa_state_t))child_state_change;
+ this->public.message = (void(*)(bus_t*, message_t *message, bool incoming))message;
+ this->public.ike_keys = (void(*)(bus_t*, ike_sa_t *ike_sa, diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r, ike_sa_t *rekey))ike_keys;
+ this->public.child_keys = (void(*)(bus_t*, child_sa_t *child_sa, diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r))child_keys;
+ this->public.ike_updown = (void(*)(bus_t*, ike_sa_t *ike_sa, bool up))ike_updown;
+ this->public.ike_rekey = (void(*)(bus_t*, ike_sa_t *old, ike_sa_t *new))ike_rekey;
+ this->public.child_updown = (void(*)(bus_t*, child_sa_t *child_sa, bool up))child_updown;
+ this->public.child_rekey = (void(*)(bus_t*, child_sa_t *old, child_sa_t *new))child_rekey;
+ this->public.authorize = (bool(*)(bus_t*, bool final))authorize;
+ this->public.destroy = (void(*)(bus_t*)) destroy;
+
+ this->listeners = linked_list_create();
+ this->mutex = mutex_create(MUTEX_TYPE_RECURSIVE);
+ this->thread_sa = thread_value_create(NULL);
+
+ return &this->public;
+}
+
diff --git a/src/libcharon/bus/bus.h b/src/libcharon/bus/bus.h
new file mode 100644
index 000000000..8cf392eae
--- /dev/null
+++ b/src/libcharon/bus/bus.h
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2006-2009 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.
+ */
+
+/**
+ * @defgroup bus bus
+ * @{ @ingroup libcharon
+ */
+
+#ifndef BUS_H_
+#define BUS_H_
+
+typedef enum alert_t alert_t;
+typedef struct bus_t bus_t;
+
+#include <stdarg.h>
+
+#include <debug.h>
+#include <sa/ike_sa.h>
+#include <sa/child_sa.h>
+#include <processing/jobs/job.h>
+#include <bus/listeners/listener.h>
+
+/* undefine the definitions from libstrongswan */
+#undef DBG0
+#undef DBG1
+#undef DBG2
+#undef DBG3
+#undef DBG4
+
+#ifndef DEBUG_LEVEL
+# define DEBUG_LEVEL 4
+#endif /* DEBUG_LEVEL */
+
+#if DEBUG_LEVEL >= 0
+#define DBG0(group, format, ...) charon->bus->log(charon->bus, group, 0, format, ##__VA_ARGS__)
+#endif /* DEBUG_LEVEL >= 0 */
+#if DEBUG_LEVEL >= 1
+#define DBG1(group, format, ...) charon->bus->log(charon->bus, group, 1, format, ##__VA_ARGS__)
+#endif /* DEBUG_LEVEL >= 1 */
+#if DEBUG_LEVEL >= 2
+#define DBG2(group, format, ...) charon->bus->log(charon->bus, group, 2, format, ##__VA_ARGS__)
+#endif /* DEBUG_LEVEL >= 2 */
+#if DEBUG_LEVEL >= 3
+#define DBG3(group, format, ...) charon->bus->log(charon->bus, group, 3, format, ##__VA_ARGS__)
+#endif /* DEBUG_LEVEL >= 3 */
+#if DEBUG_LEVEL >= 4
+#define DBG4(group, format, ...) charon->bus->log(charon->bus, group, 4, format, ##__VA_ARGS__)
+#endif /* DEBUG_LEVEL >= 4 */
+
+#ifndef DBG0
+# define DBG0(...) {}
+#endif /* DBG0 */
+#ifndef DBG1
+# define DBG1(...) {}
+#endif /* DBG1 */
+#ifndef DBG2
+# define DBG2(...) {}
+#endif /* DBG2 */
+#ifndef DBG3
+# define DBG3(...) {}
+#endif /* DBG3 */
+#ifndef DBG4
+# define DBG4(...) {}
+#endif /* DBG4 */
+
+/**
+ * Kind of alerts to raise.
+ */
+enum alert_t {
+ /* a RADIUS server did not respond, no additional arguments */
+ ALERT_RADIUS_NOT_RESPONDING,
+ /* a shutdown signal has been received, argument is a int with the signal */
+ ALERT_SHUTDOWN_SIGNAL,
+};
+
+/**
+ * The bus receives events and sends them to all registered listeners.
+ *
+ * Any events sent to are delivered to all registered listeners. Threads
+ * may wait actively to events using the blocking listen() call.
+ */
+struct bus_t {
+
+ /**
+ * Register a listener to the bus.
+ *
+ * A registered listener receives all events which are sent to the bus.
+ * The listener is passive; the thread which emitted the event
+ * processes the listener routine.
+ *
+ * @param listener listener to register.
+ */
+ void (*add_listener) (bus_t *this, listener_t *listener);
+
+ /**
+ * Unregister a listener from the bus.
+ *
+ * @param listener listener to unregister.
+ */
+ void (*remove_listener) (bus_t *this, listener_t *listener);
+
+ /**
+ * Register a listener and block the calling thread.
+ *
+ * This call registers a listener and blocks the calling thread until
+ * its listeners function returns FALSE. This allows to wait for certain
+ * events. The associated job is executed after the listener has been
+ * registered: This allows to listen on events we initiate with the job,
+ * without missing any events to job may fire.
+ *
+ * @param listener listener to register
+ * @param job job to execute asynchronously when registered, or NULL
+ */
+ void (*listen)(bus_t *this, listener_t *listener, job_t *job);
+
+ /**
+ * Set the IKE_SA the calling thread is using.
+ *
+ * To associate an received log message to an IKE_SA without passing it as
+ * parameter each time, the thread registers the currenlty used IKE_SA
+ * during check-out. Before check-in, the thread unregisters the IKE_SA.
+ * This IKE_SA is stored per-thread, so each thread has its own IKE_SA
+ * registered.
+ *
+ * @param ike_sa ike_sa to register, or NULL to unregister
+ */
+ void (*set_sa) (bus_t *this, ike_sa_t *ike_sa);
+
+ /**
+ * Get the IKE_SA the calling thread is currently using.
+ *
+ * If a thread currently does not know what IKE_SA it is processing,
+ * it can call get_sa() to look up the SA set during checkout via set_sa().
+ *
+ * @return registered ike_sa, NULL if none registered
+ */
+ ike_sa_t* (*get_sa)(bus_t *this);
+
+ /**
+ * Send a log message to the bus.
+ *
+ * The signal specifies the type of the event occured. The format string
+ * specifies an additional informational or error message with a
+ * printf() like variable argument list.
+ * Use the DBG() macros.
+ *
+ * @param group debugging group
+ * @param level verbosity level of the signal
+ * @param format printf() style format string
+ * @param ... printf() style argument list
+ */
+ void (*log)(bus_t *this, debug_t group, level_t level, char* format, ...);
+
+ /**
+ * Send a log message to the bus using va_list arguments.
+ *
+ * Same as bus_t.signal(), but uses va_list argument list.
+ *
+ * @param group kind of the signal (up, down, rekeyed, ...)
+ * @param level verbosity level of the signal
+ * @param format printf() style format string
+ * @param args va_list arguments
+ */
+ void (*vlog)(bus_t *this, debug_t group, level_t level,
+ char* format, va_list args);
+
+ /**
+ * Raise an alert over the bus.
+ *
+ * @param alert kind of alert
+ * @param ... alert specific attributes
+ */
+ void (*alert)(bus_t *this, alert_t alert, ...);
+
+ /**
+ * Send a IKE_SA state change event to the bus.
+ *
+ * @param ike_sa IKE_SA which changes its state
+ * @param state new state IKE_SA changes to
+ */
+ void (*ike_state_change)(bus_t *this, ike_sa_t *ike_sa,
+ ike_sa_state_t state);
+ /**
+ * Send a CHILD_SA state change event to the bus.
+ *
+ * @param child_sa CHILD_SA which changes its state
+ * @param state new state CHILD_SA changes to
+ */
+ void (*child_state_change)(bus_t *this, child_sa_t *child_sa,
+ child_sa_state_t state);
+ /**
+ * Message send/receive hook.
+ *
+ * @param message message to send/receive
+ * @param incoming TRUE for incoming messages, FALSE for outgoing
+ */
+ void (*message)(bus_t *this, message_t *message, bool incoming);
+
+ /**
+ * IKE_SA authorization hook.
+ *
+ * @param final TRUE if this is the final invocation
+ * @return TRUE to establish IKE_SA, FALSE to send AUTH_FAILED
+ */
+ bool (*authorize)(bus_t *this, bool final);
+
+ /**
+ * IKE_SA keymat hook.
+ *
+ * @param ike_sa IKE_SA this keymat belongs to
+ * @param dh diffie hellman shared secret
+ * @param nonce_i initiators nonce
+ * @param nonce_r responders nonce
+ * @param rekey IKE_SA we are rekeying, if any
+ */
+ void (*ike_keys)(bus_t *this, ike_sa_t *ike_sa, diffie_hellman_t *dh,
+ chunk_t nonce_i, chunk_t nonce_r, ike_sa_t *rekey);
+ /**
+ * CHILD_SA keymat hook.
+ *
+ * @param child_sa CHILD_SA this keymat is used for
+ * @param dh diffie hellman shared secret
+ * @param nonce_i initiators nonce
+ * @param nonce_r responders nonce
+ */
+ void (*child_keys)(bus_t *this, child_sa_t *child_sa, diffie_hellman_t *dh,
+ chunk_t nonce_i, chunk_t nonce_r);
+
+ /**
+ * IKE_SA up/down hook.
+ *
+ * @param ike_sa IKE_SA coming up/going down
+ * @param up TRUE for an up event, FALSE for a down event
+ */
+ void (*ike_updown)(bus_t *this, ike_sa_t *ike_sa, bool up);
+
+ /**
+ * IKE_SA rekeying hook.
+ *
+ * @param old rekeyed and obsolete IKE_SA
+ * @param new new IKE_SA replacing old
+ */
+ void (*ike_rekey)(bus_t *this, ike_sa_t *old, ike_sa_t *new);
+
+ /**
+ * CHILD_SA up/down hook.
+ *
+ * @param child_sa CHILD_SA coming up/going down
+ * @param up TRUE for an up event, FALSE for a down event
+ */
+ void (*child_updown)(bus_t *this, child_sa_t *child_sa, bool up);
+
+ /**
+ * CHILD_SA rekeying hook.
+ *
+ * @param old rekeyed and obsolete CHILD_SA
+ * @param new new CHILD_SA replacing old
+ */
+ void (*child_rekey)(bus_t *this, child_sa_t *old, child_sa_t *new);
+
+ /**
+ * Destroy the event bus.
+ */
+ void (*destroy) (bus_t *this);
+};
+
+/**
+ * Create the event bus which forwards events to its listeners.
+ *
+ * @return event bus instance
+ */
+bus_t *bus_create();
+
+#endif /** BUS_H_ @}*/
diff --git a/src/libcharon/bus/listeners/file_logger.c b/src/libcharon/bus/listeners/file_logger.c
new file mode 100644
index 000000000..12587deaf
--- /dev/null
+++ b/src/libcharon/bus/listeners/file_logger.c
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2006 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 <stdio.h>
+#include <string.h>
+
+#include "file_logger.h"
+
+
+typedef struct private_file_logger_t private_file_logger_t;
+
+/**
+ * Private data of a file_logger_t object
+ */
+struct private_file_logger_t {
+
+ /**
+ * Public data.
+ */
+ file_logger_t public;
+
+ /**
+ * output file
+ */
+ FILE *out;
+
+ /**
+ * Maximum level to log, for each group
+ */
+ level_t levels[DBG_MAX];
+};
+
+/**
+ * Implementation of bus_listener_t.log.
+ */
+static bool log_(private_file_logger_t *this, debug_t group, level_t level,
+ int thread, ike_sa_t* ike_sa, char *format, va_list args)
+{
+ if (level <= this->levels[group])
+ {
+ char buffer[8192];
+ char *current = buffer, *next;
+
+ /* write in memory buffer first */
+ vsnprintf(buffer, sizeof(buffer), format, args);
+
+ /* prepend a prefix in front of every line */
+ while (current)
+ {
+ next = strchr(current, '\n');
+ if (next)
+ {
+ *(next++) = '\0';
+ }
+ fprintf(this->out, "%.2d[%N] %s\n",
+ thread, debug_names, group, current);
+ current = next;
+ }
+ }
+ /* always stay registered */
+ return TRUE;
+}
+
+/**
+ * Implementation of file_logger_t.set_level.
+ */
+static void set_level(private_file_logger_t *this, debug_t group, level_t level)
+{
+ if (group < DBG_ANY)
+ {
+ this->levels[group] = level;
+ }
+ else
+ {
+ for (group = 0; group < DBG_MAX; group++)
+ {
+ this->levels[group] = level;
+ }
+ }
+}
+
+/**
+ * Implementation of file_logger_t.destroy.
+ */
+static void destroy(private_file_logger_t *this)
+{
+ if (this->out != stdout && this->out != stderr)
+ {
+ fclose(this->out);
+ }
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+file_logger_t *file_logger_create(FILE *out)
+{
+ private_file_logger_t *this = malloc_thing(private_file_logger_t);
+
+ /* public functions */
+ memset(&this->public.listener, 0, sizeof(listener_t));
+ this->public.listener.log = (bool(*)(listener_t*,debug_t,level_t,int,ike_sa_t*,char*,va_list))log_;
+ this->public.set_level = (void(*)(file_logger_t*,debug_t,level_t))set_level;
+ this->public.destroy = (void(*)(file_logger_t*))destroy;
+
+ /* private variables */
+ this->out = out;
+ set_level(this, DBG_ANY, LEVEL_SILENT);
+
+ return &this->public;
+}
+
diff --git a/src/libcharon/bus/listeners/file_logger.h b/src/libcharon/bus/listeners/file_logger.h
new file mode 100644
index 000000000..bd443fdb8
--- /dev/null
+++ b/src/libcharon/bus/listeners/file_logger.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2006 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.
+ */
+
+/**
+ * @defgroup file_logger file_logger
+ * @{ @ingroup listeners
+ */
+
+#ifndef FILE_LOGGER_H_
+#define FILE_LOGGER_H_
+
+#include <bus/listeners/listener.h>
+
+typedef struct file_logger_t file_logger_t;
+
+/**
+ * Logger to files which implements listener_t.
+ */
+struct file_logger_t {
+
+ /**
+ * Implements the listener_t interface.
+ */
+ listener_t listener;
+
+ /**
+ * Set the loglevel for a debug group.
+ *
+ * @param group debug group to set
+ * @param level max level to log (0..4)
+ */
+ void (*set_level) (file_logger_t *this, debug_t group, level_t level);
+
+ /**
+ * Destroys a file_logger_t object.
+ */
+ void (*destroy) (file_logger_t *this);
+};
+
+/**
+ * Constructor to create a file_logger_t object.
+ *
+ * @param out FILE to write to
+ * @return file_logger_t object
+ */
+file_logger_t *file_logger_create(FILE *out);
+
+#endif /** FILE_LOGGER_H_ @}*/
diff --git a/src/libcharon/bus/listeners/listener.h b/src/libcharon/bus/listeners/listener.h
new file mode 100644
index 000000000..9a51a2ef4
--- /dev/null
+++ b/src/libcharon/bus/listeners/listener.h
@@ -0,0 +1,178 @@
+/*
+ * 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.
+ */
+
+/**
+ * @defgroup listener listener
+ * @{ @ingroup listeners
+ */
+
+#ifndef LISTENER_H_
+#define LISTENER_H_
+
+typedef struct listener_t listener_t;
+
+#include <bus/bus.h>
+
+/**
+ * Listener interface, listens to events if registered to the bus.
+ */
+struct listener_t {
+
+ /**
+ * Log a debugging message.
+ *
+ * The implementing signal function returns TRUE to stay registered
+ * to the bus, or FALSE to unregister itself.
+ * Calling bus_t.log() inside of a registered listener is possible,
+ * but the bus does not invoke listeners recursively.
+ *
+ * @param group kind of the signal (up, down, rekeyed, ...)
+ * @param level verbosity level of the signal
+ * @param thread ID of the thread raised this signal
+ * @param ike_sa IKE_SA associated to the event
+ * @param format printf() style format string
+ * @param args vprintf() style va_list argument list
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*log)(listener_t *this, debug_t group, level_t level, int thread,
+ ike_sa_t *ike_sa, char* format, va_list args);
+
+ /**
+ * Hook called if a critical alert is risen.
+ *
+ * @param ike_sa IKE_SA associated to the alert, if any
+ * @param alert kind of alert
+ * @param ... alert specific argument list
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*alert)(listener_t *this, ike_sa_t *ike_sa,
+ alert_t alert, va_list args);
+
+ /**
+ * Handle state changes in an IKE_SA.
+ *
+ * @param ike_sa IKE_SA which changes its state
+ * @param state new IKE_SA state this IKE_SA changes to
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*ike_state_change)(listener_t *this, ike_sa_t *ike_sa,
+ ike_sa_state_t state);
+
+ /**
+ * Handle state changes in a CHILD_SA.
+ *
+ * @param ike_sa IKE_SA containing the affected CHILD_SA
+ * @param child_sa CHILD_SA which changes its state
+ * @param state new CHILD_SA state this CHILD_SA changes to
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*child_state_change)(listener_t *this, ike_sa_t *ike_sa,
+ child_sa_t *child_sa, child_sa_state_t state);
+
+ /**
+ * Hook called for received/sent messages of an IKE_SA.
+ *
+ * @param ike_sa IKE_SA sending/receving a message
+ * @param message message object
+ * @param incoming TRUE for incoming messages, FALSE for outgoing
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*message)(listener_t *this, ike_sa_t *ike_sa, message_t *message,
+ bool incoming);
+
+ /**
+ * Hook called with IKE_SA key material.
+ *
+ * @param ike_sa IKE_SA this keymat belongs to
+ * @param dh diffie hellman shared secret
+ * @param nonce_i initiators nonce
+ * @param nonce_r responders nonce
+ * @param rekey IKE_SA we are rekeying, if any
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*ike_keys)(listener_t *this, ike_sa_t *ike_sa, diffie_hellman_t *dh,
+ chunk_t nonce_i, chunk_t nonce_r, ike_sa_t *rekey);
+
+ /**
+ * Hook called with CHILD_SA key material.
+ *
+ * @param ike_sa IKE_SA the child sa belongs to
+ * @param child_sa CHILD_SA this keymat is used for
+ * @param dh diffie hellman shared secret
+ * @param nonce_i initiators nonce
+ * @param nonce_r responders nonce
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*child_keys)(listener_t *this, ike_sa_t *ike_sa, child_sa_t *child_sa,
+ diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r);
+
+ /**
+ * Hook called if an IKE_SA gets up or down.
+ *
+ * @param ike_sa IKE_SA coming up/going down
+ * @param up TRUE for an up event, FALSE for a down event
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*ike_updown)(listener_t *this, ike_sa_t *ike_sa, bool up);
+
+ /**
+ * Hook called when an IKE_SA gets rekeyed.
+ *
+ * @param old rekeyed IKE_SA getting obsolete
+ * @param new new IKE_SA replacing old
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*ike_rekey)(listener_t *this, ike_sa_t *old, ike_sa_t *new);
+
+ /**
+ * Hook called when a CHILD_SA gets up or down.
+ *
+ * @param ike_sa IKE_SA containing the handled CHILD_SA
+ * @param child_sa CHILD_SA coming up/going down
+ * @param up TRUE for an up event, FALSE for a down event
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*child_updown)(listener_t *this, ike_sa_t *ike_sa,
+ child_sa_t *child_sa, bool up);
+
+ /**
+ * Hook called when an CHILD_SA gets rekeyed.
+ *
+ * @param ike_sa IKE_SA containing the rekeyed CHILD_SA
+ * @param old rekeyed CHILD_SA getting obsolete
+ * @param new new CHILD_SA replacing old
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*child_rekey)(listener_t *this, ike_sa_t *ike_sa,
+ child_sa_t *old, child_sa_t *new);
+
+ /**
+ * Hook called to invoke additional authorization rules.
+ *
+ * An authorization hook gets invoked several times: After each
+ * authentication round, the hook gets invoked with with final = FALSE.
+ * After authentication is complete and the peer configuration is selected,
+ * it is invoked again, but with final = TRUE.
+ *
+ * @param ike_sa IKE_SA to authorize
+ * @param final TRUE if this is the final hook invocation
+ * @param success set to TRUE to complete IKE_SA, FALSE abort
+ * @return TRUE to stay registered, FALSE to unregister
+ */
+ bool (*authorize)(listener_t *this, ike_sa_t *ike_sa,
+ bool final, bool *success);
+};
+
+#endif /** LISTENER_H_ @}*/
diff --git a/src/libcharon/bus/listeners/sys_logger.c b/src/libcharon/bus/listeners/sys_logger.c
new file mode 100644
index 000000000..11421ad05
--- /dev/null
+++ b/src/libcharon/bus/listeners/sys_logger.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2006 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 <stdio.h>
+#include <string.h>
+
+#include "sys_logger.h"
+
+
+typedef struct private_sys_logger_t private_sys_logger_t;
+
+/**
+ * Private data of a sys_logger_t object
+ */
+struct private_sys_logger_t {
+
+ /**
+ * Public data.
+ */
+ sys_logger_t public;
+
+ /**
+ * syslog facility to use
+ */
+ int facility;
+
+ /**
+ * Maximum level to log, for each group
+ */
+ level_t levels[DBG_MAX];
+};
+
+/**
+ * Implementation of listener_t.log.
+ */
+static bool log_(private_sys_logger_t *this, debug_t group, level_t level,
+ int thread, ike_sa_t* ike_sa, char *format, va_list args)
+{
+ if (level <= this->levels[group])
+ {
+ char buffer[8192];
+ char *current = buffer, *next;
+
+ /* write in memory buffer first */
+ vsnprintf(buffer, sizeof(buffer), format, args);
+
+ /* do a syslog with every line */
+ while (current)
+ {
+ next = strchr(current, '\n');
+ if (next)
+ {
+ *(next++) = '\0';
+ }
+ syslog(this->facility|LOG_INFO, "%.2d[%N] %s\n",
+ thread, debug_names, group, current);
+ current = next;
+ }
+ }
+ /* always stay registered */
+ return TRUE;
+}
+
+/**
+ * Implementation of sys_logger_t.set_level.
+ */
+static void set_level(private_sys_logger_t *this, debug_t group, level_t level)
+{
+ if (group < DBG_ANY)
+ {
+ this->levels[group] = level;
+ }
+ else
+ {
+ for (group = 0; group < DBG_MAX; group++)
+ {
+ this->levels[group] = level;
+ }
+ }
+}
+
+/**
+ * Implementation of sys_logger_t.destroy.
+ */
+static void destroy(private_sys_logger_t *this)
+{
+ closelog();
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+sys_logger_t *sys_logger_create(int facility)
+{
+ private_sys_logger_t *this = malloc_thing(private_sys_logger_t);
+
+ /* public functions */
+ memset(&this->public.listener, 0, sizeof(listener_t));
+ this->public.listener.log = (bool(*)(listener_t*,debug_t,level_t,int,ike_sa_t*,char*,va_list))log_;
+ this->public.set_level = (void(*)(sys_logger_t*,debug_t,level_t))set_level;
+ this->public.destroy = (void(*)(sys_logger_t*))destroy;
+
+ /* private variables */
+ this->facility = facility;
+ set_level(this, DBG_ANY, LEVEL_SILENT);
+
+ return &this->public;
+}
diff --git a/src/libcharon/bus/listeners/sys_logger.h b/src/libcharon/bus/listeners/sys_logger.h
new file mode 100644
index 000000000..730890d68
--- /dev/null
+++ b/src/libcharon/bus/listeners/sys_logger.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2006 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.
+ */
+
+/**
+ * @defgroup sys_logger sys_logger
+ * @{ @ingroup listeners
+ */
+
+#ifndef SYS_LOGGER_H_
+#define SYS_LOGGER_H_
+
+#include <syslog.h>
+
+#include <bus/listeners/listener.h>
+
+typedef struct sys_logger_t sys_logger_t;
+
+/**
+ * Logger for syslog which implements listener_t.
+ */
+struct sys_logger_t {
+
+ /**
+ * Implements the listener_t interface.
+ */
+ listener_t listener;
+
+ /**
+ * Set the loglevel for a debug group.
+ *
+ * @param group debug group to set
+ * @param level max level to log (0..4)
+ */
+ void (*set_level) (sys_logger_t *this, debug_t group, level_t level);
+
+ /**
+ * Destroys a sys_logger_t object.
+ */
+ void (*destroy) (sys_logger_t *this);
+};
+
+/**
+ * Constructor to create a sys_logger_t object.
+ *
+ * @param facility syslog facility to use
+ * @return sys_logger_t object
+ */
+sys_logger_t *sys_logger_create(int facility);
+
+#endif /** SYS_LOGGER_H_ @}*/