introduced printf() specifiers for:

host_t (%H)
  identification_t (%D)
  chunk pointers (%B)
  memory pointer/length (%b)
added a signaling bus:
  receives event and debug messages, sends them to its listeners
  stream_logger, sys_logger, file_logger added, listen to bus
some other tweaks here and there

src/charon/bus/bus.c

@@ -0,0 +1,142 @@
+/**
+ * @file bus.c
+ *
+ * @brief Implementation of bus_t.
+ *
+ */
+
+/*
+ * 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"
+
+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 implementing the bus_t interface
+	 */
+	linked_list_t *listeners;
+	
+	/**
+	 * Thread local storage for a unique, simple thread ID
+	 */
+	pthread_key_t thread_id;
+	
+	/**
+	 * Thread local storage the threads IKE_SA
+	 */
+	pthread_key_t thread_sa;
+	
+};
+
+/**
+ * Get a unique thread number for a calling thread. Since
+ * pthread_self returns large and ugly numbers, use this function
+ * for logging; these numbers are incremental starting at 1
+ */
+static int get_thread_number(private_bus_t *this)
+{
+	static int current_num = 0, stored_num;
+	
+	stored_num = (int)pthread_getspecific(this->thread_id);
+	if (stored_num == 0)
+	{	/* first call of current thread */
+		pthread_setspecific(this->thread_id, (void*)++current_num);
+		return current_num;
+	}
+	else
+	{
+		return stored_num;
+	}
+}
+
+/**
+ * Implementation of bus_t.add_listener.
+ */
+static void add_listener(private_bus_t *this, bus_listener_t *listener)
+{
+	this->listeners->insert_last(this->listeners, (void*)listener);
+}
+
+/**
+ * Implementation of bus_t.set_sa.
+ */
+static void set_sa(private_bus_t *this, ike_sa_t *ike_sa)
+{
+	pthread_setspecific(this->thread_sa, ike_sa);
+}
+
+/**
+ * Implementation of bus_t.signal.
+ */
+static void signal_(private_bus_t *this, signal_t signal, level_t condition,
+					char* format, ...)
+{
+	iterator_t *iterator;
+	bus_listener_t *listener;
+	va_list args;
+	ike_sa_t *ike_sa;
+	int thread;
+	
+	ike_sa = pthread_getspecific(this->thread_sa);
+	thread = get_thread_number(this);
+	va_start(args, format);
+	
+	iterator = this->listeners->create_iterator(this->listeners, TRUE);
+	while (iterator->iterate(iterator, (void**)&listener))
+	{
+		listener->signal(listener, thread, ike_sa,
+						 signal, condition, format, args);
+	}
+	iterator->destroy(iterator);
+	va_end(args);
+}
+
+/**
+ * Implementation of bus_t.destroy.
+ */
+static void destroy(private_bus_t *this)
+{
+	this->listeners->destroy(this->listeners);
+	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*,bus_listener_t*))add_listener;
+	this->public.set_sa = (void(*)(bus_t*,ike_sa_t*))set_sa;
+	this->public.signal = (void(*)(bus_t*,signal_t,level_t,char*,...))signal_;
+	this->public.destroy = (void(*)(bus_t*)) destroy;
+	
+	this->listeners = linked_list_create();
+	pthread_key_create(&this->thread_id, NULL);
+	pthread_key_create(&this->thread_sa, NULL);
+	
+	return &(this->public);
+}